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Tytuł:
SOLAP GIS in maritime research
Autorzy:
Drypczewski, K.
Stepnowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/332276.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Akustyczne
Tematy:
spatio-temporal GIS
multidimensional data
fish biomass estimation
AIS
tracking vessel movement
Opis:
Multidimensional Geographical Information System is a system especially designed to acquire, distribute, analyze and visualize complicated spatio-temporal data. Modern Geographical Information System technology can provide easy-to-use, near real-time solutions to many problems from different areas of research. In the article, authors summarize recent works on Spatial Online Analytical Processing (SOLAP) and multidimensional Geographical Information System (GIS), discuss its capabilities and data structures used in spatio-temporal datasets, and propose its possible applications in maritime research.
Źródło:
Hydroacoustics; 2016, 19; 93-100
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relevance of philosophical approach to values in social science to maritime research
Autorzy:
Sharma, D. R.
Powiązania:
https://bibliotekanauki.pl/articles/24201426.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
research methods
maritime research
qualitative methods
Philosophy social science
values research
research design
philosophical concepts
research philosophy
Opis:
The origin of maritime research lies in a multi‐disciplinary approach. The philosophical grounding for academic research inherently shapes the methodological approach, data collection methods adopted, and analysis techniques deployed. Thus, there is a need for an insight into the philosophical underpinnings of maritime research for better understanding of research design in maritime context. The paper will examine social science and its grounding in philosophical concepts for qualitative research, and the relevance of philosophical approach to ‘values’ in social science, to maritime research by using qualitative methods. The aim is to apprise the novice maritime researchers ‐ in simplistic language, about the philosophical approach to values, as an alternative to complex descriptions of concepts available in philosophical articles and references.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 3; 643--650
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Expert as interviewer – methodological challenges in use of qualitative interviews in maritime research
Autorzy:
Sharma, D. R.
Powiązania:
https://bibliotekanauki.pl/articles/24201425.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
expert interview
qualitative interview
research interview
maritime research
research method
Interview challenges
ualitative methods
methods challenges
Opis:
Interviews are a widely used method in maritime research using qualitative methodologies. Expert interviews are conducted with people who have special knowledge because of their professional position. The status of the interviewer when using expert interviews brings forth certain distinct nuances due to the specific nature of the interview methodology and epistemological considerations. A renowned and senior maritime specialist or a veteran maritime professional researching the nuances of their own field encounter methodological challenges while interviewing other experts during data collection. The paper aims to examine the impact on qualitative data collected in interviews when the interviewers themselves are experts in the field of research. The concepts from the social science research from various disciplines have been examined and discussed highlighting the methodological challenges.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 3; 638--642
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ethical considerations in maritime cybersecurity research
Autorzy:
Oruc, A.
Powiązania:
https://bibliotekanauki.pl/articles/2172503.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
maritime cyber security
cyber security
maritime cyber security research
cyber risk
ethical considerations
ethical dilemmas
ethical principles
ethical conflicts
Opis:
Maritime transportation, an essential component of world trade, is performed by contemporary vessels. Despite the improvements that rapid advances in technology have brought to vessels’ operational efficiency and capability for safe navigation, the cyber risks associated with modern systems have increased apace. Widespread publicity regarding cyber incidents onboard ships has sparked extensive research on the part of universities, industry, and governmental organisations seeking to understand cyber risks. Consequently, researchers have discovered and disclosed an increasing number of threats and vulnerabilities in this context, providing information that in itself may pose a threat when accessed by the wrong parties. Thus, this paper aims to raise researchers’ awareness of ethical concerns and provide guidance for sound decision-making in areas where the research process must be handled carefully to avoid harm. To this end, this paper presents a literature review that explores the ethical issues involved in maritime cybersecurity research and provides specific examples to promote further understanding. Six ethical principles and four categories of ethical dilemmas are discussed. Finally, the paper offers recommendations that can guide researchers in dealing with any ethical conflicts that may arise while studying maritime cybersecurity.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2022, 16, 2; 309--318
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Report from Xth European Colloquium On Maritime Law Research Toruń, 20th–21st of September 2018
Autorzy:
Nawrot, Justyna
Pepłowska-Dąbrowska, Zuzanna
Powiązania:
https://bibliotekanauki.pl/articles/1954758.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Nauki Humanistyczne i Społeczne
Źródło:
Prawo Morskie; 2019, XXXVI; 133-143
0860-7338
Pojawia się w:
Prawo Morskie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The concept of marine seismic research quality coefficient of improve its accuracy and efficiency
Autorzy:
Waluś, A.
Gucma, L.
Putynkowski, G.
Powiązania:
https://bibliotekanauki.pl/articles/320938.pdf
Data publikacji:
2014
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
geophysical maritime seismic research
quality of marine geophysical works
seismic vessel navigation
Opis:
The paper presents the stages of quantitative coefficient of marine seismic researches creation for the geophysical vessels towing the geophysical seismic equipment understood as system of seismic streamers where set of geophones are installed. The quality coefficient of geophysical research works is based on the mathematical model of the deviation of the position of the arrangement of streamers geophone points with relation to their idealized position. The proposed coefficient can be used during realization of seismic researches and for short-term prediction of their quality.
W artykule przedstawiono budowę ilościowego wskaźnika jakości morskich prac sejsmicznych dla jednostki holującej osprzęt geofizyczny w postaci układu kabli sejsmicznych z zainstalowanym zespołem geofonów. Wskaźnik jakości prac geofizycznych opiera się na matematycznym modelu odchylenia położenia układu punktów kabli geofonowych w stosunku do położenia wzorcowego. Wskaźnik ten może być wykorzystany przy realizacji prac sejsmicznych oraz krótkoterminowego prognozowania ich przebiegu w aspekcie jakości.
Źródło:
Annual of Navigation; 2014, 21; 163-176
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Career decision making in the maritime industry: research of merchant marine officers using Fuzzy AHP and Fuzzy TOPSIS methods
Autorzy:
Kaya, A. Y.
Asyali, E.
Ozdagoglu, A.
Powiązania:
https://bibliotekanauki.pl/articles/134952.pdf
Data publikacji:
2018
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
maritime industry
individual career planning
career decision making
vessel types
Fuzzy AHP
Fuzzy TOPSIS
Opis:
Individual career planning plays a key role in achieving success, goals, and ideals in professional life. However, managing to accomplish such favorable results depends on the correct decisions of graduates to choose suitable job opportunities. Oceangoing watchkeeping officers, who are responsible for the management and administration of vessels at sea, have several job options which are differentiated by vessel type, such as; bulk carriers, chemical tankers, general cargo ships, and container ships, etc. This study aims to discuss the criteria that Turkish oceangoing watchkeeping officers take into consideration and the values they attribute to such criteria regarding their vessel type preference. The aim is to provide instructions to oceangoing watchkeeping officer candidates and academicians who are interested in these issues and related parties of maritime industry. Attribution values of the criteria are determined by means of Fuzzy Analytic Hierarchy Process (AHP) and the most preferred alternative vessel type is revealed through Fuzzy TOPSIS methodology. According to the study results, the most important factors are; revenue, perception of occupational health and safety, and labor work density. The most preferred ship type among alternatives is the oil tanker.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2018, 55 (127); 95-103
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on Maritime Education and Training in China: A Broader Perspective
Autorzy:
Dong, W. H.
Powiązania:
https://bibliotekanauki.pl/articles/116835.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
MET System in China
Maritime Education and Training (MET) Recruitment
Shanghai Maritime University (SMU)
Dalian Maritime University (DMU)
Maritime Education
Chinese Seamen
Chinese MET
Opis:
China’s Maritime Education and Training (MET) has been providing numerous talents for its shipping industry in the past decades. However, the traditional Chinese MET emphasized more on crew training but ignored shipping services’ fields. This paper firstly redefines the concept of MET from a broader perspective, then outlines the current status quo of MET in China from the new broader angle, consequently analyzes the main problems of Chinese MET, and finally proposes suggestions for regarding governments, institutions, as well as shipping companies, aiming to offer valuable ideas during the process of decision-making.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8, 1; 115-120
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania polarne Akademii Morskiej w Gdyni
Polar research Gdynia Maritime University
Autorzy:
Marsz, A. A.
Styszyńska, A.
Powiązania:
https://bibliotekanauki.pl/articles/260800.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Klimatologów Polskich
Tematy:
historia badań polarnych
bibliografia polarna
meteorologia
klimatologia
oceanologia
lody morskie
Hornsund
Spitsbergen
Arktyka
Stacja Arctowskiego
Półwysep Antarktyczny
Antarktyka
history of polar research
polar bibliography
meteorology
climatology
oceanography
sea ice
Arctic
Arctowski Station
Antarctic Peninsula
Antarctica
Opis:
W pracy omówiono tematykę badań prowadzonych przez pracowników Wyższej Szkoły Morskiej/Akademii Morskiej w Gdyni w wysokich szerokościach półkul północnej i południowej. W latach 1975-2015 pracownicy tej uczelni opublikowali łącznie 231 artykułów, komunikatów i sprawozdań oraz 14 pozycji książkowych o charakterze monograficznym dotyczących różnych aspektów badań polarnych. Wśród tych prac 142 pozycje dotyczyły Arktyki i 103 pozycje – Antarktyki. Podstawowa problematyka badawcza obejmowała zagadnienia zmienności i zmian warunków hydroklimatycznych w Arktyce i Antarktyce, kształtowania się warunków lodowych i problemów żeglugi w lodach oraz zagadnień uprawiania żeglugi w rejonach słabo rozpoznanych pod względem nawigacyjnym, w tym badań dotyczących batymetrii dna i geomorfologii wybrzeży. Artykuł zawiera jako załącznik bibliografię prac polarnych pracowników Wyższej Szkoły Morskiej i Akademii Morskiej w Gdyni.
The paper discusses topics of research conducted by the staff of the Gdynia Maritime University in the high latitudes of northern and southern hemispheres. In the years 1975-2015 the employees of the university have published a total of 231 articles, communications and reports and 14 books of monographic covering various aspects of polar research. Among the 142 works related to the Arctic positions and 103 positions – Antarctica. The basic research problems included issues variability and change hydro-climatic conditions in the Arctic and Antarctic, the formation of ice conditions and navigation in ice problems and issues of navigation in areas poorly recognized in terms of navigation, including research on the bottom bathymetry and geomorphology coasts. The article includes as an annex a bibliography of works polar employees Gdynia Maritime University.
Źródło:
Problemy Klimatologii Polarnej; 2015, 25; 75-98
1234-0715
Pojawia się w:
Problemy Klimatologii Polarnej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on the maritime communication cryptographic chip’s compiler optimization
Autorzy:
Li, S.
Dai, Z. B.
Powiązania:
https://bibliotekanauki.pl/articles/259239.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
maritime communication encryption system
cryptographic SOC
compiler frontend
loop unrolling
Opis:
In the process of ocean development, the technology for maritime communication system is a hot research field, of which information security is vital for the normal operation of the whole system, and that is also one of the difficulties in the research of maritime communication system. In this paper, a kind of maritime communication cryptographic SOC(system on chip) is introduced, and its compiler framework is put forward through analysis of working mode and problems faced by compiler front end. Then, a loop unrolling factor calculating algorithm based on queue theory, named UFBOQ (unrolling factor based on queue), is proposed to make parallel optimization in the compiler frontend with consideration of the instruction memory capacity limit. Finally, the scalar replacement method is used to optimize unrolled code to solve the memory access latency on the parallel computing efficiency, for continuous data storage characteristics of cryptographic algorithm. The UFBOQ algorithm and scalar replacement prove effective and appropriate, of which the effect achieves the linear speedup.
Źródło:
Polish Maritime Research; 2017, S 2; 50-65
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Maritime Education and Research to Face the XXI-st Century Challenges in Gdynia Maritime University’s Experience Part I – Maritime Universities Facing Today and Tomorrow’s Challenges
Autorzy:
Mindykowski, J.
Charchalis, A.
Przybyłowski, P.
Weintrit, A.
Powiązania:
https://bibliotekanauki.pl/articles/116773.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Maritime Education and Training (MET)
MET System in Poland
Gdynia Maritime University (GMU)
21st Century Challenges, STCW Convention Vocational Education and Training (VET)
Domain of Maritime Education
International Association of Maritime Universities (IAMU)
Opis:
In the paper, divided into two parts, a problem of advancements in maritime education and research facing the 21st century challenges, based on the case study of the Gdynia Maritime University (GMU) experience is discussed. Part I is devoted to the main directions of advances in the maritime education and research towards the challenges in a global meaning. In this context, the education and research potential of the Gdynia Maritime University, as one of the world-leading maritime universities, is shortly presented. Part II is dedicated to the Gdynia Maritime University experiencing the 21st century challenges. The GMU’s contribution and good practices concerning the participation in modification of the processes of the IMO STCW 78/2010 convention, adoption of programmes into the international and national qualification frameworks’ standards and procedures, as well as the development of research addressed to a new technological and organizational solution are described and analyzed.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2013, 7, 4; 575-579
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Maritime Education and Research to Face the XXI-st Century Challenges in Gdynia Maritime University’s Experience Part II – Gdynia Maritime University of Experience the 21st Century Challenges
Autorzy:
Mindykowski, J.
Charchalis, A.
Przybyłowski, P.
Weintrit, A.
Powiązania:
https://bibliotekanauki.pl/articles/117036.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Maritime Education and Training (MET)
Gdynia Maritime University (GMU)
STCW Convention
MET System in Poland
21st Century Challenges
European Framework of Qualifications
IMO Activity
Polish Activity in IMO
Opis:
In the paper, divided into two parts, a problem of advancements in maritime education and research facing the 21st century challenges, based on the case study of the Gdynia Maritime University (GMU) experience is discussed. Part I is devoted to the advances in the maritime education and research towards the challenges in a global meaning. The maritime education challenges are focused on contribution of the University’s representatives in full implementation of the STCW 1978 as amended in 2010 convention, and on the flexible adoption of the academic specializations and programmes to the European and National Qualifications Frameworks, as well as to the needs of a global and local labour market. The research advancements in the maritime universities are basically oriented to marine transport problems, and their main focus is concentrated on the implementation of new technologies, effective and reliable technical and organizational solutions, friendly for users and environment. Part II is dedicated to the Gdynia Maritime University experiencing the 21st century challenges. In this part, firstly the education and research potential of the Gdynia Maritime University, as the one of the world-leading maritime universities, is shortly presented. And next, the GMU’s contribution and good practices concerning the participation in modification of the processes of the IMO STCW 78/2010 convention, adoption of programmes into the international and national qualification frameworks’ standards and procedures, as well as the development of research addressed to a new technological and organizational solution are described and analyzed.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2013, 7, 4; 581-586
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on the maritime logistics pricing model of risk-averse retailer-dominated dual-channel supply chain
Autorzy:
Fang, Q.
Tong, Z.
Ren, L.
Liu, A.
Powiązania:
https://bibliotekanauki.pl/articles/258648.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
dual channel
risk-averse
retailer-dominated
supply chain
Opis:
Price decision is studied in a risk-averse retailer-dominated dual-channel supply chain, which consisting of one manufacturers and one retailer with both off-line and on-line channels. Firstly, two mean-variance models in centralized and decentralized supply chain are established. Secondly, the optimal solutions under the two decision modes are compared and analyzed. The results shows that the price of dual-channel of retailer decreased with the increase of retailers’ risk- aversion coefficient and the standard deviation of the fluctuation of market demand, while the wholesale price changes is on the contrary; in addition, when the market demand is greater than a certain value, the prices of dual channel are correspondingly higher in decentralized supply chain than in centralized supply chain, and vice versa. In addition, when the retailer’s risk aversion is in a certain interval, the expected utility of the whole supply chain is greater in centralized supply chain than in decentralized decision, and vice versa. Finally, a numerical example is given to verify the above conclusions.
Źródło:
Polish Maritime Research; 2018, S 2; 107-116
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Działalność naukowo-badawcza Organizacji NATO ds. Nauki i Technologii – NATO STO
Scientific and research activity of the NATO Science and Technology Organization – NATO STO
Autorzy:
Miller, Anna
Powiązania:
https://bibliotekanauki.pl/articles/2028873.pdf
Data publikacji:
2021
Wydawca:
Centralna Biblioteka Wojskowa im Marszałka Józefa Piłsudskiego
Tematy:
Organizacja NATO ds. Nauki i Technologii
NATO STO
Centrum Badań i Doświadczeń Morskich
CMRE
prace badawczo-rozwojowe
B+R
współpraca naukowo-badawcza
technika wojskowa
technologie obronne
Krajowe Centrum Dystrybucji Publikacji NATO STO
Centralna Biblioteka Wojskowa
zarządzanie wiedzą
panele technologiczne
bezpieczeństwo
technologie przełomowe
NATO Science and Technology Organization
Centre for Maritime Research and Experimentation
research and development
R&D
science and technology research collaboration
military technology
defence technology
NATO STO National Distribution Centre
Central Military Library
knowledge management
technological panels
disruptive technologies
security
Opis:
Organizacja NATO ds. Nauki i Technologii to największe na świecie forum międzynarodowej współpracy naukowo-badawczej w dziedzinie bezpieczeństwa. W artykule przedstawiono strukturę tej instytucji oraz opisano obszary wiedzy i techniki aktualnie rozwijane przez panele NATO STO. Zaprezentowano również działalność Centrum Badań i Doświadczeń Morskich, należący do NATO STO ośrodek, który jest dla państw Sojuszu repozytorium wiedzy z dziedziny bezpieczeństwa morskiego. Ponadto artykuł uwzględnia udział polskich przedstawicieli w pracach NATO STO, a także wskazuje na rolę Krajowego Centrum Dystrybucji Publikacji NATO STO w Centralnej Bibliotece Wojskowej w zakresie rozpowszechniania dorobku badawczego przedstawionej instytucji.
The NATO Science and Technology Organization is the world’s largest international research forum in the field of defence science and technology. The article focuses on presenting the areas of the STO Technical Panels’ expertise. The activities of the STO Centre for Maritime Research and Experimentation (CMRE), a world-class facility which is the Alliance’s repository of expert knowledge in maritime defence and security, were also described. In addition, the article highlights the participation of Polish representatives in NATO STO activities, as well as the role of the NATO STO National Distribution Centre in the Central Military Library in promoting the research output of the presented institution.
Źródło:
Studia i Materiały Centralnej Biblioteki Wojskowej; 2021, 2(16); 181-228
2354-0435
2719-8618
Pojawia się w:
Studia i Materiały Centralnej Biblioteki Wojskowej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The legal aspects of marine scientific research in Polish maritime areas
Zasady prawne prowadzenia morskich badań naukowych w polskich obszarach morskich
Autorzy:
Gorski, T.
Powiązania:
https://bibliotekanauki.pl/articles/85005.pdf
Data publikacji:
2006
Wydawca:
Akademia Pomorska w Słupsku
Tematy:
legal aspect
sea scientific research
scientific research
Polska
sea area
law
international law
legislation
United Nations Convention on the Law of the Sea
Opis:
The article presents the legal rules concerning the conduct of marine scientific research in Polish maritime areas by either Polish or the foreign researchers in the light of the international law and the relevant Polish national legislation. According to the 1982 United Nations Convention on the Law of the Sea the foreign researchers have to apply for an express consent of the respective Polish administrative board in order to conduct marine scientific research in Polish marine territory. In Polish exclusive economic zone the consent may be either express or implied. Poland is entitled to withhold, cease or suspend the consent only under certain circumstances determined in accordance with international law. Concerning Polish nationals no consent is required. The compare of Polish national legislation and appropriate regulations of the 1982 United Nations Convention on the Law of the Sea indicates a high degree of compatibility.
Artykuł przedstawia zasady prowadzenia morskich badań naukowych w polskich obszarach morskich, zarówno przez podmioty zagraniczne, jak i polskie, na gruncie prawa międzynarodowego oraz odpowiednich polskich przepisów krajowych. Zgodnie z Konwencją Narodów Zjednoczonych o prawie morza z 1982 r. podmioty zagraniczne prowadzące morskie badania naukowe na polskim terytorium morskim muszą uzyskać wyraźną zgodę, wydaną przez właściwy organ polskiej administracji, natomiast w polskiej wyłącznej strefie ekonomicznej zgoda może mieć charakter wyraźny lub dorozumiany. Polska jest uprawniona do wstrzymania, cofnięcia lub do zawieszenia wydanej zgody jedynie w okolicznościach ścisłe określonych w Konwencji. Uzyskanie zgody nie jest wymagane w stosunku do podmiotów o polskiej przynależności. Porównanie postanowień polskiego prawa wewnętrznego z odpowiednimi regulacjami Konwencji Narodów Zjednoczonych o prawie morza wykazuje wysoki stopień ich wzajemnej zgodności.
Źródło:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline; 2006, 10
1643-0115
Pojawia się w:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of eye-tracking techniques in human factor research in marine operations. Challenges and methodology
Autorzy:
Muczyński, B.
Gucma, M.
Powiązania:
https://bibliotekanauki.pl/articles/360105.pdf
Data publikacji:
2013
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
eye-tracking
technique methodology
maritime operations
human factor research
data analysis
Opis:
The following paper provides information about eye-tracking techniques and methodology. It is focused on introducing eye movement metrics in human factor research in maritime domain, explaining basic methodology and describing the types of data analysis, thus providing the background and guidelines for simple eyetracking studies.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2013, 36 (108) z. 1; 116-120
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identyfikacja możliwości współpracy w zakresie innowacyjności i transferu technologii między uczelniami, podmiotami i instytucjami badawczymi a przedsiębiorstwami sektora gospodarki morskiej w Polsce
Identification of the co-operation between higher education institutions, research organizations and maritime companies in Poland in innovation and technology transfer
Autorzy:
Christowa, C.
Powiązania:
https://bibliotekanauki.pl/articles/78546.pdf
Data publikacji:
2015
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Źródło:
Folia Pomeranae Universitatis Technologiae Stetinensis. Oeconomica; 2015, 78
2081-0644
Pojawia się w:
Folia Pomeranae Universitatis Technologiae Stetinensis. Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CFD optimisation of the longitudinal volume distribution of a ship’s hull by constrained transformation of the sectional area curve
Autorzy:
Kraskowski, Marek
Powiązania:
https://bibliotekanauki.pl/articles/32906720.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
parametric optimisation
CFD
model tests
resistance
wave pattern
Opis:
The paper presents a proposal for a formalised approach to hull shape optimisation with respect to total resistance, by fine-tuning longitudinal volume distribution. An algorithm for automated modification of the hull is presented, allowing for varying the sectional area distribution with a negligible influence on the resulting displacement. Computational fluid dynamics (CFD) solver STAR-CCM+ and computer computer-aided design (CAD) software NX were used to search the optimal volume distribution of selected parent shapes, with respect to total resistance. The bow part and the aft part were optimised separately. The resulting resistances of the selected optimal shapes were then verified by means of scale model tests, realised in the towing tank at the Maritime Advanced Research Centre (CTO) S.A. A noticeable gain in total resistance was achieved and confirmed by experimental tests. The proposed approach seems to be a promising method for relatively quick parametric optimisation of the designed hull shapes; it is also applicable for generic CFD optimisation studies.
Źródło:
Polish Maritime Research; 2022, 3; 11-20
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Future sustainable maritime sector: fishing carriers and their adoption to the environmental regulations. Part I
Autorzy:
Yalama, Viktor
Yakovleva, Olga
Trandafilov, Volodymyr
Khmelniuk, Mykhailo
Powiązania:
https://bibliotekanauki.pl/articles/32912854.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
maritime sustainable scenario policy
energy management
energy efficiency
fishing carrier
marine plastic debris
Opis:
The study explored the legislative database for the maritime sector to be sustainable and have an intact blue economy. The problem for organizations with shipowners that have fishing boats older than 20 years is stated. Decision-making authorities face challenges nowadays. To be in the fleet for the next decade, shipowners for their ships should deploy energy efficiency projects for marine system retrofitting to improve energy efficiency and meet environmental regulations. The Ship Energy Efficiency Management Plan’s development principles are discussed due to the current need for its deployment from 2021, so shipowners can contribute to the fast adoption of new regulations by the International Maritime Organization. In this work it is being offered to incorporate energy management issues with guidelines for upcoming regulations as well as those that are currently enforced. To improve energy efficiency, reduce environmental impact and cut fuel consumption costs, marine system retrofitting has been proposed. In this paper the focus is being put on studying energy management strengths and weaknesses which can lead to a qualitative understanding of the performance of the organizational structure, this work also focuses on the management settings concerning energy efficiency. If the organization wants to win by integrating energy policy, high-quality communication or promotion of energy efficiency issues should be employed. Marine plastic debris challenges fishing carriers on the African Union route. A possible beneficial solution for shipowners is discussed in this study.
Źródło:
Polish Maritime Research; 2022, 3; 69-77
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction of weld deformations by numerical methods - review
Autorzy:
Kozak, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/32887011.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
welding distortion
shipbuilding welding
numerical simulation
Opis:
The welding process is the basic technique of joining in the shipbuilding industry. This method generates welding distortions that cause a lot of problems during the manufacturing process due to both the time and cost of straightening as well as their influence on later stages of production. Proper preparation of welding processes plays a growing role in the shipbuilding industry and the development of calculating tools is being observed. The paper presents a review and critical analysis of numerical methods for the assessment of welding distortion.
Źródło:
Polish Maritime Research; 2022, 1; 97-107
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Understanding fuel saving and clean fuel strategies towards green maritime
Autorzy:
Van Nhanh, Nguyen
Rudzki, Krzysztof
Dzida, Marek
Pham, Nguyen Dang Khoa
Pham, Minh Tuan
Nguyen, Phuoc Quy Phong
Nguyen, Xuan Phuong
Powiązania:
https://bibliotekanauki.pl/articles/32919438.pdf
Data publikacji:
2023
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
marine engine
alternative fuel
green maritime
fuel savings
low-carbon strategy
Opis:
Due to recent emission-associated regulations imposed on marine fuel, ship owners have been forced to seek alternate fuels, in order to meet the new limits. The aim of achieving low-carbon shipping by the year 2050, has meant that alternative marine fuels, as well as various technological and operational initiatives, need to be taken into account. This article evaluates and examines recent clean fuels and novel clean technologies for vessels. The alternative fuels are classified as low-carbon fuels, carbon-free fuels, and carbon neutral fuels, based on their properties. Fuel properties, the status of technological development, and existing challenges are also summarised in this paper. Furthermore, researchers have also investigated energy-saving devices and discovered that zero-carbon and virtually zero-carbon clean fuels, together with clean production, might play an important part in shipping, despite the commercial impracticability of existing costs and infrastructure. More interestingly, the transition to marine fuel is known to be a lengthy process; thus, early consensus-building, as well as action-adoption, in the maritime community is critical for meeting the expectations and aims of sustainable marine transportation.
Źródło:
Polish Maritime Research; 2023, 2; 146-164
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on preventive maintenance strategies and systems for in-service ship equipment
Autorzy:
Song, Tingxin
Tan, Taiyang
Han, Guochen
Powiązania:
https://bibliotekanauki.pl/articles/32887248.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
preventive maintenance
FMEA
lifetime prediction
decision system
ship equipment
Opis:
With continuous improvements in the function and performance of ship equipment, mechanisms of failure have become more and more complicated. To avoid over-maintenance or under-maintenance in existing routine ship maintenance strategies, a ship-level method for repair decisions based on the preventive maintenance concept is proposed in this paper. First, the anticipated repair demand levels of key components are calculated using an improved failure mode and effects analysis (FMEA) method; second, a Weibull distribution model is established, and the parameters are estimated using the maximum likelihood estimation (MLE) to predict the characteristic life of the equipment; then, logical decision principles and rule-based reasoning (RBR) are used to determine the ship repair level and repair timing. Finally, the feasibility and application value of the proposed repair strategy were verified by case studies, and a ship-level system for repair decisions was established.
Źródło:
Polish Maritime Research; 2022, 1; 85-96
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the use of M2M-type NB-IoT and LTE technologies for maritime communication systems
Autorzy:
Gajewski, Sławomir
Czapiewska, Agnieszka
Gajewska, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/32917849.pdf
Data publikacji:
2023
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
NB-IoT maritime solutions
NB-IoT coverage at sea
NB-IoT performance
sea propagation loss
CE2R
CE3R
Opis:
The development of IoT (the Internet of Things) wireless transmission opens a new era in communication systems. In the next years, the development and implementation of IoT systems will be very dynamic. It can be seen that the solutions of LTE – NB-IoT (Long Term Evolution – Narrowband IoT) transmission devices are implemented in a wide range of terrestrial solutions, e.g. smart grids. This paper aims to analyse the possibility of the use of NB-IoT technology for maritime communication applications and partially, for some maritime safety solutions, based on signal coverage analysis at sea. An interesting approach is the comparison of the results of NB-IoT coverage to the classic cellular LTEbased communication systems. Proposed solutions are based on the practical implementation of a designed specialised data concentrator with implemented gateway and radio modems, for both NB-IoT technology as well as LTE. In the paper, analyses of radio link budget and propagation loss models for sea environment are presented. The coverage analysis is based on real measurements of the efficiency of transmissions using wireless modems implemented in the developed data concentrator.
Źródło:
Polish Maritime Research; 2023, 1; 126-134
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and operational diagnostics of marine propellers made of polymer materials
Autorzy:
Kluczyk, Marcin
Grządziela, Andrzej
Batur, Tomislav
Powiązania:
https://bibliotekanauki.pl/articles/32898214.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
diagnostics
polymeric materials
propellers
Opis:
There has been a rapidly growing interest in the use of composite and polymer materials for the construction of marine propellers for over 20 years. The main advantages of these materials are a reduction in the weight of the propeller, increased efficiency due to the hydroelasticity effect, a reduction of the hydroacoustic signature, and a cost reduction for serial production. This paper presents an overview of diagnostic methods that can be applied at the design level and during the operation of marine propellers made of polymeric materials. Non-invasive contact and non-contact-based diagnostic techniques for evaluating the technical state of the propeller are reviewed, and the advantages and disadvantages of qualitative and quantitative methods are identified. Operational diagnostic procedures for propellers are areessential for the safety of vessels at sea. Finally, the structure of a diagnostic system is proposed. It combined diagnosis process with the genesis of damage and the prognosis of the technical condition, i.e. production and in-service diagnostics.
Źródło:
Polish Maritime Research; 2022, 4; 115-122
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of model-scale open-water test uncertainty
Autorzy:
Król, Przemysław
Powiązania:
https://bibliotekanauki.pl/articles/32898216.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
uncertainty
propeller open-water test
lifting surface method
model-scale experiment
propulsion
Opis:
Within the frame of CTO’s standard procedure, a propeller open-water test is preceded by a reference measurement, which is taken for a reference propeller model (P356). The results of these measurements are assembled to conduct an open-water test uncertainty analysis. Additional material was gathered from open-water tests that were conducted throughout several research projects on the CP469 model, which is a model of the Nawigator XXI propeller. The latter is a controllable pitch propeller; its pitch was reset before each test repetition. Known procedures for the determination of the open-water test uncertainty do not allow one to extract the manufacture impact directly, without building many models. This factor was addressed with the use of lifting surface calculations. Under certain additional assumptions, these calculations were performed for 100 generic versions of each propeller’s geometry, which were generated by random deviations from the theoretical data within the limits of allowed tolerances. The results of the conducted analyses made it possible to extract separate factors, which were connected to the test’s repeatability, measurement bias and geometry tolerance.
Źródło:
Polish Maritime Research; 2022, 4; 4-11
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of material thickness on the ductile fracture of steel plates for shipbuilding
Autorzy:
Jakub, Kowalski
Janusz, Kozak
Powiązania:
https://bibliotekanauki.pl/articles/32912848.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ductility
toughness
plasticity
CTOD
Opis:
In the shipbuilding industry, the risk of brittle fractures is relatively high because some units operate in arctic or subarctic zones and use high thickness (up to 100 mm) steel plates in their structures. This risk is limited by employing certified materials with a specific impact strength, determined using the Charpy method (for a given design temperature) and by exercising control over the welding processes (technology qualification, production supervision, and non-destructive tests). However, for offshore constructions, such requirements may prove insufficient. For this reason, regulations employed in constructing offshore structures require conducting crack tip opening displacement (CTOD) tests for steel and welded joints with thicknesses exceeding 40 mm for high tensile strength steel and 50 mm for other steel types. Since classification codes do not accept the results of CTOD tests conducted on specimens of sub-sized dimensions, the problem of theoretically modelling the steel construction destruction process is of key importance, as laboratory tests for notched elements of considerable thickness (100 mm and higher) are costly and problems stemming from high loads and a wide range of recorded parameters are not uncommon. The aim of this research is to find a relationship between material thickness and CTOD value, by establishing and verifying a numerical model that allows recalculating a result obtained on a sub-size specimen to a full- size specimen for a ductile fracture mode. This work presents results and conclusions from numerical modelling and compares them with laboratory test results of the elastic-plastic properties of high thickness steel, typically used in offshore applications.
Źródło:
Polish Maritime Research; 2022, 3; 160-166
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Consistent design of PID controllers for an autopilot
Autorzy:
Świder, Zbigniew
Trybus, Leszek
Stec, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/32917355.pdf
Data publikacji:
2023
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
course control
autopilot
track control
PID tunings
Opis:
A consistent approach to the development of tuning rules for course-keeping and path-tracking PID controllers for a ship autopilot are presented. The consistency comes from the observation that for each of the controllers the controlled plant can be modelled by an integrator with inertia. In the case of the course controller, it is the well-known Nomoto model. The PID controller may be implemented in series or parallel form, the consequence of which is a 2nd or 3rd order of the system, specified by a double or triple closed-loop time constant. The new tuning rules may be an alternative to the standard ones given in [1,2]. It is shown that, whereas the reference responses for the standard and new rules are almost the same, the new rules provide better suppression of disturbances such as wind, waves or current. The parallel controller is particularly advantageous. The path-tracking PID controller can provide better tracking accuracy than the conventional PI. Simulated path-tracking trajectories generated by a cascade control system are presented. The novelty of this research is in the theory, specifically in the development of new tuning rules for the two PID autopilot controllers that improve disturbance suppression.
Źródło:
Polish Maritime Research; 2023, 1; 78-85
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ophthalmic injuries in sailors and sea workers – pathomechanism and treatment
Autorzy:
Grąbczewski, Andrzej
Jendrzejczyk, Martyna
Klekot, Grzegorz
Skopiński, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/32917890.pdf
Data publikacji:
2023
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ophthalmic injuries
sea workers
Opis:
The purpose of the article is to do a literature review and present own experience regarding the main causes of ophthalmic injuries in sailors and crew workers. Sailors and sea workers often use heavy equipment when working on a vessel, offshore platform or other. Using these types of tools often carries high risk of injury. They are also exposed to various chemicals, many of which are eye irritants. Ophthalmic injuries are common but rarely fatal. They can lead to vision loss, reduce the quality of life and inability to continue work. The categorized types of these injuries and included chemical, mechanical, electrical, diving related barotrauma and infections. We present the most common cause of these types of injury, situations in which they can occur, pathomechamism of eye damage, recommend a prevention method, recommend the possible first aid and present cases in which specialized treatment in a reference hospital is necessary.
Źródło:
Polish Maritime Research; 2023, 1; 156-162
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A generative approach to hull design for a small watercraft
Autorzy:
Karczewski, Artur
Kozak, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/32917891.pdf
Data publikacji:
2023
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
method
generative design
yacht
optimisation
genetic algorithm
Opis:
In the field of ocean engineering, the task of spatial hull modelling is one of the most complicated problems in ship design. This study presents a procedure applied as a generative approach to the design problems for the hull geometry of small vessels using elements of concurrent design with multi-criteria optimisation processes. Based upon widely available commercial software, an algorithm for the mathematical formulation of the boundary conditions, the data flow during processing and formulae for the optimisation processes are developed. As an example of the application of this novel approach, the results for the hull design of a sailing yacht are presented.
Źródło:
Polish Maritime Research; 2023, 1; 4-12
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic positioning capability assessment based on optimal thrust allocation
Autorzy:
Piekło, Agnieszka
Witkowska, Anna
Zubowicz, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/34604896.pdf
Data publikacji:
2023
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
optimal thrust allocation
dynamic positioning
quadratic programming
Opis:
The article presents an efficient method of optimal thrust allocation over the actuators in a dynamically positioned ship, according to the DNV-ST-0111 standard, Level 1. The optimisation task is approximated to a convex problem with linear constraints and mathematically formulated as quadratic programming. The case study is being used to illustrate the use of the proposed approach in assessing the DP capability of a rescue ship. The quadratic programmingbased approach applied for dynamic positioning capability assessment allows for fast calculations to qualitatively compare different ship designs. In comparison with the DNV tool, it gives 100% successful validation for a ship with azimuth thrusters and a pessimistic solution for a ship equipped with propellers with rudders. Therefore, it can be safely applied at an early design stage.
Źródło:
Polish Maritime Research; 2023, 2; 28-38
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental research of the impact of ship’s rolling on the performance of PV panels
Autorzy:
Zeńczak, Wojciech
Zapałowicz, Zbigniew
Powiązania:
https://bibliotekanauki.pl/articles/32897005.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship power system
PV system
ship’s energy efficiency design index
ship rolling
Opis:
The aim of the International Maritime Organization (IMO) to reduce by half the amount of greenhouse gases emitted by marine ships by 2050, and its vision of the fastest total decarbonisation in the maritime shipping industry within the present century, calls for implementation with various means of decarbonisation. The IMO approaches the process of decarbonisation in two phases. Firstly, short-term, compact projects are to be considered, next, more complex, medium- and long-term solutions should be aimed at. The preferred arrangements to be applied are photovoltaic systems. Their performance depends to a high degree on the solar incidence angle. In the case of a ship swinging as a result of its course in relation to the wave and incidence direction, the incidence angle undergoes significant periodic changes with a significant effect on the power generated by the PV panels. As a result, the total amount of energy produced by the PV panels diminishes. The paper presents experimental research results obtained on the stand that allowed the investigation of PV panels in simulated marine conditions. Two characteristic positions of a PV panel’s rotation axis in relation to the solar rays’ incidence direction were investigated. It was proved for both variants that the rolling period and solar incidence angle affected the power generated by the PV panel.
Źródło:
Polish Maritime Research; 2022, 4; 132-144
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Review of the container ship loading model – cause analysis of cargo damage and/or loss
Autorzy:
Kaup, Magdalena
Łozowicka, Dorota
Baszak, Karolina
Ślączka, Wojciech
Kalbarczyk-Jedynak, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/32898223.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
operations process modelling
safety management
container
loss of cargo
maritime transport
means of transport
Opis:
As the maritime transport of containers continues to grow and container ships change in terms of design and construction, it is important to ensure the appropriate level of safety for this type of transport. Over the decades, the size and cargo capacity of container ships have been changing, and so have their manoeuvring restrictions and required stability criteria. It seems that changes in the regulations, technological development and increased stability requirements are not yielding satisfactory results – the causes of container ship accidents continue to show similar patterns. The present article refers to the problem of ensuring safety in sea container transport, with a particular focus on cargo processes. Its purpose is to determine cause-and-effect relations leading to the loss of containers at sea, and to develop a model of loading that could significantly raise the level of safety of container transport. The article provides a general description of threats to ships related to weather conditions, loading methods or stability limitations. A statistical analysis of the occurrence of damage and/or loss of cargo from container ships was carried out and the risk of cargo loss was assessed on the basis of data from 2015‒2019. A Pareto diagram was used for this purpose. The authors present the concept of the container ship loading model, which may contribute to increasing the safety of shipping in the future.
Źródło:
Polish Maritime Research; 2022, 4; 26-35
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the environmental impact of the hull construction of a small vessel based on LCA
Autorzy:
Nakielski, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/34599948.pdf
Data publikacji:
2023
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
LCA
hull
craft
recycling materials
Opis:
In recent years, issues related to the impact of human activity on the natural environment have become pressing, and the challenge of global warming necessitates immediate action. To support environmental protection efforts, it has become imperative to adopt a broader perspective when evaluating various products and systems. A valuable tool for such assessments is a life cycle assessment (LCA), which enables a comprehensive analysis of the entire life cycle of a product. This paper presents a comparative analysis of the hull of a fast patrol craft, fabricated using three different materials: steel, aluminium, and composite materials. The LCA covers every stage from material production, through the construction and use of the hull, to its eventual disposal. A specific criterion was established to evaluate the impact of the hull on the environment, with clearly defined system boundaries. In the final section, we draw some conclusions that underscore the importance of reusing construction materials. By emphasising this approach, ecological footprints can be minimised and a sustainable future can be created.
Źródło:
Polish Maritime Research; 2023, 4; 54-60
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Retrofitting the bow of a general cargo vessel andevaluating Energy Efficiency Operational Index
Autorzy:
Denev, Yordan
Powiązania:
https://bibliotekanauki.pl/articles/34603369.pdf
Data publikacji:
2023
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
retrofitting
bulbous bow
energy efficiency design index
return costs
Opis:
This report examines the feasibility and impact of retrofitting the bulbous bow on a general cargo ship, in terms of the energy efficiency operational index (EEOI), in the areas of Western Europe and the Eastern Mediterranean. Three ship forms were developed and analysed: with a bulbous bow, without a bulbous bow, and with a modified bulbous bow. The goal in developing the ship forms and conducting the analysis was to achieve minimal differences in the ship’s characteristics with the same volumetric displacement, aided by PolyCAD software. A route was selected between two ports: Varna and Rotterdam. The labour intensity of the bulbous bow retrofitting process was evaluated and approximate values of labours costs and cost for the task were determined. The results obtained for resistance during ship motion, EEOI, and fuel consumption reductions, or increases, were compared against the retrofitting values. The return cost of retrofitting is evaluated and measured in terms of fuel saved.
Źródło:
Polish Maritime Research; 2023, 4; 17-23
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fault diagnosis of bearings based on SSWT, bayes optimisation and CNN
Autorzy:
Yan, Guohua
Hu, Yihuai
Shi, Qingguo
Powiązania:
https://bibliotekanauki.pl/articles/34610052.pdf
Data publikacji:
2023
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
fault diagnosis
bearing
PMSM
bayesian optimisation
CNN
Opis:
Bearings are important components of rotating machinery and transmission systems, and are often damaged by wear, overload and shocks. Due to the low resolution of traditional time-frequency analysis for the diagnosis of bearing faults, a synchrosqueezed wavelet transform (SSWT) is proposed to improve the resolution. An improved convolutional neural network fault diagnosis model is proposed in this paper, and a Bayesian optimisation method is applied to automatically adjust the structure and hyperparameters of the model to improve the accuracy of bearing fault diagnosis. Experimental results from the accelerated life testing of bearings show that the proposed method is able to accurately identify various types of bearing fault and the different status of these faults under complex running conditions, while achieving very good generalisation ability.
Źródło:
Polish Maritime Research; 2023, 3; 132-141
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy and emission quality ranking of newly produced low-sulphur marine fuels
Autorzy:
Korczewski, Zbigniew
Powiązania:
https://bibliotekanauki.pl/articles/32893718.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
low-sulphur marine fuels
engine tests
ranking of energy and emission quality
Opis:
The article describes the methodology of engine tests on new types of low-sulphur marine fuels in laboratory conditions in order to conduct a comprehensive assessment of their suitability for powering full-size marine engines. The innovativeness of the proposed solution consists of adapting the laboratory Diesel Engine Test Bed to carry out experimental tests using residual and alternative fuels so that it is possible to imitate the real operating conditions of the ship engine. The main aim of the research program was to assess the energy efficiency of six different low-sulphur marine fuels and their impact on the chemical emissivity of engine exhaust gases and air pollution with toxic and harmful chemical compounds. In order to achieve the research purpose formulated in this way, it was necessary to: (1) equip the constructed laboratory stand with highly specialised measuring equipment and (2) develop a technology for determining diagnostic parameters representing the basis for developing a ranking of the energy and emission quality of the tested marine fuels according to the proposed physical model. The model distinguishes 10 diagnostic parameters that, after normalisation, form two subsets of evaluation parameters - stimulant and destimulant. Determining their values made it possible to estimate a synthetic variable, according to which all the tested fuels were adjusted in the order from the “best” to the “worst”, in accordance with the adopted qualitative criteria of such an assessment. The results of the laboratory tests show that among the considered fuels, i.e., MDO, MGO, RMD 80/L, RMD 80/S, RME 180, and RMG 380 type, the best solution is to use MDO distillate fuel to power full-size marine engines. However, taking into account its high purchase price, a rational alternative decision is to choose RMG 380 type residual fuel, which ranks second in the ranking of the functional quality of the tested marine fuels.
Źródło:
Polish Maritime Research; 2022, 4; 77-87
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
General strength, energy efficiency (EEDI), and energy wave criterion (EWC) of deadrise hulls for transitional mode
Autorzy:
Kanifolskyi, Oleksandr
Powiązania:
https://bibliotekanauki.pl/articles/32913092.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
energy wave criterion
energy efficiency factor
design accelerations
Opis:
In the modern world, environmental issues come to the fore. The document of MARPOL for reducing the emission of pollutants into the atmosphere relates to the energy efficiency coefficient EEDI . This coefficient is directly related to the power of the main engine and, accordingly, to the water resistance. The way to reduce the energy efficiency factor EEDI by increasing the relative length \( \frac{L}{ \sqrt[3]{V}} \) of the ship was proposed in this article. To determine the maximum value of the relative length, knowledge of the general strength of the vessel is required. The value of the relative section modulus of an equivalent girder for a small vessel of transitional mode is defined. The result of the graphic solution of two equations is the value of such a relative section modulus. This parameter is required to determine the limiting value of the relative length and to find solutions to reduce the coefficient EEDI . Comparative analysis of the obtained data with the data of the strength and weight of the H-girder with a length similar to the ship was conducted. The formula for determining the limiting value of the relative length was obtained from the equation of general strength. For a preliminary assessment of the future project of the ship, in terms of permissible design accelerations and the possibility of the ship moving against a sea wave of a certain height, a graph was built based on the application of the energy wave criterion EWCand the requirements of various classification societies.
Źródło:
Polish Maritime Research; 2022, 3; 4-10
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vessel energy requirement prediction from acceleration stage towing tests on scale models
Autorzy:
Wrzask, Klaudia
Powiązania:
https://bibliotekanauki.pl/articles/34604690.pdf
Data publikacji:
2023
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ships energy requirement
towing tank test
acceleration stage
hydrodynamic added mass
Opis:
One of the most crucial tasks for naval architects is computing the energy required to meet the ship’s operational needs. When predicting a ship’s energy requirements, a series of hull resistance tests on a scale model vessel is carried out in constant speed stages, while the acceleration stage measurements are ignored. Another important factor in seakeeping analysis is the ship’s hydrodynamic added mass. The second law of dynamics states that all this valuable information, that is, the dependence of the hull resistance on the vessel’s speed and the added mass, is accessible from just one acceleration stage towing test done up to the maximum speed. Therefore, the acceleration stage, often overlooked in traditional towing experiments, can be a valuable source of information. For this reason, this work aims to generalise Froude’s scaling procedure to full-scale vessels for the accelerated stage towing tests.
Źródło:
Polish Maritime Research; 2023, 2; 4-10
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on the risk classification of cruise ship fires based on an attention-BP neural network
Autorzy:
Xiong, Zhenghua
Xiang, Bo
Chen, Ye
Chen, Bin
Powiązania:
https://bibliotekanauki.pl/articles/32912853.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
cruise fire
simulation modeling
ensemble learning
BP neural network
Opis:
Due to the relatively closed environment, complex internal structure, and difficult evacuation of personnel, it is more difficult to prevent ship fires than land fires. In this paper, taking the large cruise ship as the research object, the physical model of a cruise cabin fire is established through PyroSim software, and the safety indexes such as smoke temperature, CO concentration, and visibility are numerically simulated. An Attention-BP neural network model is designed for realizing the intelligent identification of a cabin fire and dividing the risk level, which integrates the diagnosis results of multiple neural network models through the self-Attention mechanism and adaptively distributes the weight of each BP neural network model. The proposed model can provide decision-making reference for subsequent fire-fighting measures and personnel evacuation. Experimental results show that the proposed Attention-BP neural network model can effectively realize the early warning of the fire risk level. Compared with other machine learning algorithms, it has the highest stability and accuracy and reduces the uncertainty of early cabin fire warning.
Źródło:
Polish Maritime Research; 2022, 3; 61-68
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Future sustainable maritime sector: energy efficiency improvement and environmental impact reduction for fishing carriers older than 20 years in the fleet. Part II
Autorzy:
Yalama, Viktor
Yakovleva, Olga
Trandafilov, Volodymyr
Khmelniuk, Mykhailo
Powiązania:
https://bibliotekanauki.pl/articles/32906972.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
blue economy
energy efficiency
fishing carrier
vapor compression refrigeration machine
Opis:
For the maritime sector to be sustainable and to have an intact blue economy, shipowners should be ready to implement Ship Energy Efficiency Management Plans alongside energy efficiency projects. The problem for organizations and shipowners having fishing carriers older than 20 years is highlighted and the following challenges arise for decision-making authorities. To keep such ships in the fleet for the next decade, shipowners should deploy energy efficiency projects for marine system retrofitting to improve energy efficiency and meet environmental regulations. An energy audit is performed and an energy efficiency program is proposed with guidelines for regulations that are currently coming into force. To improve energy efficiency, reduce the environmental impact, and cut fuel consumption costs, marine system retrofitting is done, in a particular case, with two options proposed. The first is a cascade refrigeration system with hydrocarbons and carbon dioxide, where the shipowner gains an energy efficiency improvement of about 20%. The second option is a two-stage refrigeration system with ammonium as the environmentally friendly refrigerant, which improves the energy efficiency by about 26%. Technical and economic issues have been discussed.
Źródło:
Polish Maritime Research; 2022, 3; 78-88
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heave plates with holes for floating offshore wind turbines
Autorzy:
Ciba, Ewelina
Dymarski, Paweł
Grygorowicz, Mirosław
Powiązania:
https://bibliotekanauki.pl/articles/32891488.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
spar platforms
heave plates
damping coefficient
Floating Offshore Wind Turbines (FOWTs)
Opis:
The paper presents an innovative solution which is heave plates with holes. The long-known heave plates are designed to damp the heave motion of platforms. They are most often used for Spar platforms. The growing interest in this type of platform as supporting structures for offshore wind turbines makes it necessary to look for new solutions. Based on the available literature and the authors’ own research, it was concluded that the main element responsible for the damping of heave plates is not so much the surface of the plate, but its edge. Therefore, it was decided to investigate the effect of the holes in heave plates on their damping coefficient. Model tests and CFD calculations were performed for three different structures: a smooth cylinder, a cylinder with heave plates with a diameter of 1.4 times the diameter of the cylinder, and a cylinder with the same plate, in which 24 holes were cut (Fig. 1). Free Decay Tests (FDT) were used to determine the damping coefficient and the natural period of heave, and then the values obtained were compared. The full and punched heave-plate designs were also tested with regular waves of different periods to obtain amplitude characteristics. The results obtained are not unequivocal, as a complex motion appears here; however, it is possible to clearly define the area in which the damping of a plate with holes is greater than that of a full plate.
Źródło:
Polish Maritime Research; 2022, 1; 26-33
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sail catamaran with hybrid propulsion, design, theoretical and experimental studies
Autorzy:
Litwin, Wojciech
Piątek, Daniel
Leśniewski, Wojciech
Marszałkowski, Konrad
Powiązania:
https://bibliotekanauki.pl/articles/32900237.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
sail catamaran
green shipping
zero emission
hybrid propulsion
Opis:
The development of modern lithium batteries and propulsion systems now allows the use of complex propulsion systems for vessels of various sizes. As part of the research and implementation project, a parallel hybrid drive system was designed, built and then tested in the laboratory. The experimental studies conducted allowed for the measurements of power, fuel consumption and electric power distribution in various operating modes of the propulsion system. The research proves that in the analysed case, the hybrid parallel system meets the demand for electric energy during a typical cruise scenario, and thus there is no need to install a power generator on the yacht.
Źródło:
Polish Maritime Research; 2022, 2; 12-18
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the corrosion tester in corrosion tests using the acoustic emission method
Autorzy:
Emilianowicz, Krzysztof
Supernak, Milena
Ossowska, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/32912355.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
corrosion
hull steels
acoustic emission
corrosion tester
Opis:
The article presents an innovative method of corrosion tests using the acoustic emission method and the corrosion tester. The problem of corrosion occurring in ballast tanks and tanks carrying petroleum products is discussed. The acoustic method is presented which, due to the use of a unique corrosion tester, is used to monitor the course of corrosion processes in steel. The principle of operation of the corrosion tester, its construction and its use in Non Destructive Testing (NDT) are described in detail. Corrosion test results, obtained with the use of a corrosion tester, are presented. An analysis and a short discussion of the obtained results are given. The results of both the acoustic and metallographic tests prove the possibility of detecting material damage occurring during the operation of the corrosion tester, allowing determination of the course and type of corrosion damage.
Źródło:
Polish Maritime Research; 2022, 3; 167-175
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deep learning-based fault diagnosis for marine centrifugal fan
Autorzy:
Li, Congyue
Hu, Yihuai
Jiang, Jiawei
Yan, Guohua
Powiązania:
https://bibliotekanauki.pl/articles/32917700.pdf
Data publikacji:
2023
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
CEEMDAN
fault diagnosis
lightweight neural network
marine centrifugal fan
Opis:
Marine centrifugal fans usually work in harsh environments. Their vibration signals are non-linear. The traditional fault diagnosis methods of fans require much calculation and have low operating efficiency. Only shallow fault features can be extracted. As a result, the diagnosis accuracy is not high. It is difficult to realize the end-to-end fault diagnosis. Combining the Complete Ensemble Empirical Mode Decomposition with Adaptive Noise (CEEMDAN) and lightweight neural network, a fault classification method is proposed. First, the CEEMDAN can decompose the vibration signal into several intrinsic modal functions (IMF). Then, the original signals can be transformed into 2-D images through pseudocolour coding of the IMFs. Finally, they are fed into the lightweight neural network for fault diagnosis. By embedding a convolutional block attention module (CBAM), the ability of the network to extract critical feature information is improved. The results show that the proposed method can adaptively extract the fault characteristics of a marine centrifugal fan. While the model is lightweight, the overall diagnostic accuracy can reach 99.3%. As exploratory basic research, this method can provide a reference for intelligent fault diagnosis systems on ships.
Źródło:
Polish Maritime Research; 2023, 1; 112-120
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Guided waves in ship structural health monitoring – a feasibility study
Autorzy:
Roch, Emil
Zima, Beata
Woloszyk, Krzysztof
Garbatov, Yordan
Powiązania:
https://bibliotekanauki.pl/articles/32921251.pdf
Data publikacji:
2023
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
corrosion
guided waves
non-destructive testing
ship structure
Opis:
Ships and offshore structures operate in a severe corrosion degradation environment and face difficulty in providing longlasting corrosion protection. The Classification Societies recommend regular thickness measurements leading to structural component replacements, to ensure structural integrity during service life. The measurements are usually performed using ultrasonic thickness gauges and such an approach requires multiple measurements of the corroded structural components. Otherwise, the collected data are insufficient to precisely assess the corrosion degradation level. This study aims to perform numerical and experimental analyses to verify the use of guided ultrasonic waves in defining the corrosion degradation level of the corroded structural components of a ship. The study incorporates the fundamental antisymmetric Lamb mode, excited by piezoelectric transducers attached at the pre-selected points on stiffened panels, representing typical structural ship components. The specimens are exposed to accelerated marine corrosion degradation, the influence of the degree of degradation on the wave time of flight being analysed. The study indicates that guided waves are a promising approach for diagnosing corroded structural components. The signals characterised by a high signal-to-noise ratio have been captured, even for relatively long distances between the transducers. This proves that the proposed approach can be suitable for monitoring more extensive areas of ship structures by employing a single measurement.
Źródło:
Polish Maritime Research; 2023, 2; 76-84
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantumness in diagnostics of marine internal combustion engines and other ship power plant machines
Autorzy:
Girtler, Jerzy
Rudnicki, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/34602291.pdf
Data publikacji:
2023
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
diagnostics
stochastic proces
internal combustion engine
random variable
Opis:
The article provides proof that the diagnostics of marine internal combustion engines and other ship power plant machines should take into account the randomness and unpredictability of certain events, such as wear, damage, the variations of mechanical and thermal loads, etc., which take place during machine operation. In the article, the energy $ E $, like the other forms (methods) that it can be converted into (heat and work), is considered the random variable $ E_t $; at time $t$, this variable has the mean value $ \overline{E}_t $, which is the observed value of the statistic $ \overline{E}_{st} $ with an asymptotically normal distribution $ N ( E(E_t), \frac{ \sigma_t }{ \sqrt{n} } ) $, irrespective of the functional form of the random variable $E_t$. A proof is given that shows that the expected value estimated in the above way, considering the time t of the performance of task Z by a marine internal combustion engine or other ship power plant machine, can be used to determine the machine’s possible action (DM). When compared to the required action (DW) needed for task Z to be performed, this possible action makes it possible to formulate an operating diagnosis concerning whether the engine or machine of concern is able to perform task Z. It is assumed that an energy device of this type is able to perform a given task when the inequality DM≥DW holds. Otherwise, when DM < DW, the device cannot perform the task for which it was adopted in the design and manufacturing phase, which means that it is in the incapability state, although it still can be started and convert energy into the form of heat or work.
Źródło:
Polish Maritime Research; 2023, 4; 110-119
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Automated motion heatmap generation for Bridge Navigation Watch Monitoring System
Autorzy:
Gokcek, Veysel
Kocak, Gazi
Genc, Yakup
Powiązania:
https://bibliotekanauki.pl/articles/32888824.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
safety of navigation
navigation watch
deep learning
3D body pose
Opis:
Most ship collisions and grounding accidents are due to errors made by watchkeeping personnel (WP) on the bridge. International Maritime Organization (IMO) adopts the resolution on the Bridge Navigation Watch Alarm System (BNWAS) detecting operator disability to avert these accidents. The defined system in the resolution is very basic and vulnerable to abuse. There is a need for a more advanced system of monitoring the behaviour of WP to mitigate watchkeeping errors. In this research, a Bridge Navigation Watch Monitoring System (BNWMS) is suggested to achieve this task. Architecture is proposed to train a model for BNWMS. The literature reveals that vision-based sensors can produce relevant input data required for model training. 2D body poses belonging to the same person are estimated from multiple camera views by using a deep learning-based pose estimation algorithm. Estimated 2D poses are projected into 3D space with a maximum 8 mm error by utilising multiple view computer vision techniques. Finally, the obtained 3D poses are plotted on a bird’s-eye view bridge plan to calculate a heatmap of body motions capturing temporal, as well as spatial, information. The results show that motion heatmaps present significant information about the behaviour of WP within a defined time interval. This automated motion heatmap generation is a novel approach that provides input data for the suggested BNWMS.
Źródło:
Polish Maritime Research; 2022, 1; 63-75
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluating an inland waterway cargo vessel’s energy efficiency indices
Autorzy:
Kalajdžić, Milan
Vasilev, Matija
Momčilović, Nikola
Powiązania:
https://bibliotekanauki.pl/articles/32898591.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
inland vessels
energy efficiency
energy efficiency of inland vessels
EEXI
EEDI
Opis:
Although the International Maritime Organization (IMO) introduced the energy efficiency requirements for ships more than a decade ago, to date, inland navigation has not been affected by corresponding regulations at all. Therefore, inland waterway vessels are left with no mandatory requirements that could push their technology into more energy efficient design. Fortunately, there are certain pioneering attempts to define energy efficiency criteria for inland vessels. This paper tries to gather and provide a review of such methods. Moreover, a typical Danube cargo inland vessel’s data are used to evaluate their current energy efficiency levels with respect to provisional criteria. Consequently, two methods are found and used here. They are both based on IMO’s energy efficiency concept but modified for the inland waterway vessels. The methods delivered a significant difference in applicability and were difficult to compare. Moreover, shallow and deep-water effects are explored in the same regard but provided unsound conclusions. The final results displayed discrepancies in energy efficiency levels for the same vessels and so the methodology should be improved and harmonised, if it is to be introduced as mandatory for inland waterway vessels. The analysis provided a glimpse into the current condition of the traditional design of the Danube inland fleet, with respect to the emerging energy efficiency policies.
Źródło:
Polish Maritime Research; 2022, 2; 27-34
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A novel fault diagnosis method for marine blower with vibration signals
Autorzy:
Yan, Guohua
Hu, Yihuai
Jiang, Jiawei
Powiązania:
https://bibliotekanauki.pl/articles/32899234.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
fault diagnosis
marine blower
EEMD
correlation coefficient
AR spectrum
BPNN
Opis:
The vibration signals on marine blowers are non-linear and non-stationary. In addition, the equipment in marine engine room is numerous and affects each other, which makes it difficult to extract fault features of vibration signals in the time domain. This paper proposes a fault diagnosis method based on the combination of Ensemble Empirical Mode Decomposition (EEMD), an Autoregressive model (AR model) and the correlation coefficient method. Firstly, a series of Intrinsic Mode Function (IMF) components were obtained after the vibration signal was decomposed by EEMD. Secondly, effective IMF components were selected by the correlation coefficient method. AR models were established and the power spectrum was analysed. It was verified that blower failure can be accurately diagnosed. In addition, an intelligent diagnosis method was proposed based on the combination of EEMD energy and a Back Propagation Neural Network (BPNN), with a correlation coefficient method to get effective IMF components, and the energy components were calculated, normalised as a feature vector. Finally, the feature vector was sent to the BPNN for training and state recognition. The results indicated that the EEMD-BPNN intelligent fault diagnosis method is suitable for higly accurate fault diagnosis of marine blowers.
Źródło:
Polish Maritime Research; 2022, 2; 77-86
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-50 z 160

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