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Wyszukujesz frazę "Landowski, Michal" wg kryterium: Autor


Wyświetlanie 1-6 z 6
Tytuł:
Application of apriori algorithm in the lamination process in yacht production
Autorzy:
Niksa-Rynkiewicz, Tacjana
Landowski, Michal
Szalewski, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/1585049.pdf
Data publikacji:
2020
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
apriori algorithm
quality control
laminate defects
Opis:
The article specifies the dependence of defects occurring in the lamination process in the production of yachts. Despite great knowledge about their genesis, they cannot be completely eliminated. Authentic data obtained through cooperation with one of the Polish yacht shipyards during the years 2013–2017 were used for the analysis. To perform a simulation, the sample size was observed in 1450 samples, consisting of 6 models of yachts with closed and open deck. Finding the dependence of the occurrence of specific defects will allow for faster procedures and more effective quality control, which will contribute to lower costs. The use of new methods based on artificial intelligence related to Big Data allows for easier observation of dependencies in the complex structure of data from yacht production. The association rules were defined using the algorithm Apriori and define interdependent defects. A number of dependencies were found for the occurrence of production defects not obvious to technologists, but occurring with a high probability of coexistence. The presented research results may allow the planning process of production tasks to be improved.
Źródło:
Polish Maritime Research; 2020, 3; 59-70
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical and structural investigations of wings of selected insect species
Autorzy:
Landowski, Michał
Kunicka-Kowalska, Zuzanna
Sibilski, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/27324140.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
insect wing
structure
material
wings strength
skrzydło owada
struktura
materiał
siła skrzydeł
Opis:
This paper presents research and measurements leading to obtaining the Young’s modulus of wing bearing structures of selected insect species. A small testing machine intended for three-point bending and equipped with instruments registering low forces was constructed for the needs of the experiment. The machine was used to perform numerous bending tests of wings of three species of insects (obtained from a breeding farm): Attacus atlas, Vespa crabro, Libellula Depressa at various air-humidity conditions. Values of the force and displacement obtained in the course of the tests were used to calculate Young’s modulus. In order to do so, it was also necessary to obtain the moment of inertia of the wing cross-section. These values were measured on the basis of the images obtained with a SEM microscope. Obtained results were averaged and presented with a breakdown by air-humidity conditions. It was observed that Young’s modulus decreased with an increase of humidity, hence the calculations of the percentage decrease of this mechanical parameter were performed. Obtained results were compared with the observed structure which was also presented under light microscope. It transpired that the construction of a wing does not only influence the mechanical values but also it influences their susceptibility to the changes occurring in the environment. Thereby, differences between Lepidoptera and Hymenoptera insects were indicated also within the aspect discussed in this paper.
Źródło:
Acta of Bioengineering and Biomechanics; 2020, 22, 2; 199--209
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of solution annealing temperature on the properties of Lean Duplex 2101 welded joints in tubes
Wpływ temperatury przesycania na właściwości złączy spawanych rur ze stali typu Lean Duplex 2101
Autorzy:
Rogalski, Grzegorz
Świerczyńska, Aleksandra
Fydrych, Dariusz
Landowski, Michał
Powiązania:
https://bibliotekanauki.pl/articles/115043.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
rura stalowa
spawanie TIG
obróbka cieplna
Lean Duplex 2101
właściwości
steel tube
TIG welding
post weld heat treatment
properties
Opis:
The article presents a technology of TIG longitudinal welding without filler material (142) of heat exchanger tubes made of Lean Duplex 2101. The results of studies on the effect of heat treatment (solution annealing) on tensile strength, plasticity, delta ferrite and the structure of smooth tubes are shown. It was found, that the change in solution annealing temperature across the tested range has an impact on mechanical properties of welded tubes and the most advantageous solution annealing temperature (1050°C) was determined.
W artykule przedstawiono wpływ temperatury przesycania w powiązaniu z technologią spawania wzdłużnego metodą TIG (142) rurek stosowanych w budowie wymienników ciepła ze stali Lean Duplex 2101. Przedstawiono wyniki badań wytrzymałości na rozciąganie, prób technologicznych określających właściwości plastyczne, makro- i mikroskopowe oraz pomiaru zawartości ferrytu delta metodą magnetyczną. Ustalono, że zmiana temperatury przesycania w badanym zakresie ma wpływ na właściwości mechaniczne rurek spawanych oraz wyznaczono najkorzystniejszą z punktu widzenia tych właściwości temperaturę przesycania (1050°C).
Źródło:
Welding Technology Review; 2019, 91, 4; 49-59
0033-2364
2449-7959
Pojawia się w:
Welding Technology Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Qualification of brazing procedure for furnace brazing of austenitic steel according to requirements of the ASME BPVC, section IX
Kwalifikowanie technologii lutowania twardego próżniowego stali austenitycznej zgodnie z wymaganiami przepisów ASME BPVC, sekcja IX
Autorzy:
Rogalski, Grzegorz
Landowski, Michał
Świerczyńska, Aleksandra
Łabanowski, Jerzy
Tomków, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/1510538.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
lutowanie twarde
lutowanie próżniowe
stal nierdzewna
stal austenityczna
wymiennik ciepła
brazing
furnace brazing
austenitic steel
stainless steel
heat exchanger
Opis:
The article presents the procedure for qualifying brazing technology in a vacuum furnace on the example of stainless steel elements joined with copper filler material from the F-No group. 105, in accordance with the ASME Sec. IX, part QB (ASME Boiler and Pressure Vessel Code. Qualification Standard for Welding, Brazing and Fusing; Procedures; Welders; Brazers; and Welding, Brazing and Fusing Operators). The essential variables of the furnace brazing process are discussed in relation to the requirements of the protocol of qualified PQR (Procedure Qualification Record) and BPS (Brazing Procedure Specification) in accordance with the ASME Sec. IX. The requirements for joints by the calculation code ASME Sec. VIII div.1 (Rules of Construction of Pressure Vessels), related to the working temperature of the designed device have also been taken into account. The paper presents examples of brazed joints made and their properties (strength, fill level of the clearance) obtained on the basis of the carried out tests. Attention was paid to the technological aspects during the performance of brazed joints using vacuum furnaces.
W artykule przedstawiono procedurę kwalifikowania technologii lutowania twardego w piecu próżniowym na przykładzie elementów ze stali wysokostopowej nierdzewnej austenitycznej łączonych lutem miedzianym z grupy F-No. 105, zgodnie z przepisami ASME Sec. IX, part QB (ASME Boiler and Pressure Vessel Code. Qualification Standard for Welding, Brazing and Fusing; Procedures; Welders; Brazers; and Welding, Brazing and Fusing Operators). Omówiono zmienne zasadnicze procesu lutowania próżniowego w odniesieniu do wymagań stawianych dokumentacji tj.: protokołowi z kwalifikowanej technologii lutowania PQR (ang. Procedure Qualification Record) oraz Instrukcji technologicznej lutowania BPS (ang. Brazing Procedure Specification) zgodnie z przepisami ASME Sec. IX. Uwzględniono również wymagania stawiane połączeniom przez kod obliczeniowy ASME Sec. VIII div.1 (ang. Rules of Construction of Pressure Vessels), a związane z temperaturą pracy projektowanego urządzenia. Przedstawiono przykłady wykonanych połączeń lutowanych oraz ich właściwości (wytrzymałościowe, stopień wypełnienia szczeliny lutowniczej) uzyskane na podstawie przeprowadzonych badań. Zwrócono uwagę na aspekty technologiczne podczas wykonywania złączy lutowanych przy zastosowaniu pieców próżniowych.
Źródło:
Welding Technology Review; 2019, 91, 9; 13-24
0033-2364
2449-7959
Pojawia się w:
Welding Technology Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bead-on-Plate Underwater Wet Welding on S700MC Steel
Autorzy:
Tomków, Jacek
Świerczyńska, Aleksandra
Landowski, Michał
Wolski, Adrian
Rogalski, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/2023305.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
MMA welding
high-strength steel
underwater wet welding
covered electrode
Opis:
The participation of high strength steels in marine and offshore structures is increasing, which makes it necessary to develop recommendations for underwater repair welding works. The article presents the results of bead-on-plate welded specimens made of S700MC high strength steel in underwater wet welding conditions by covered electrodes. Three specimens with heat input values in the range 0.91-1.05 kJ/mm were made. The specimens were subjected to visual, metallographic, macro- and microscopic tests as well as hardness measurements using the Vickers method. It was found that the higher heat input leads to formation of mixed bainite-martensite microstructure in the heat-affected zone (HAZ). Lower heat input value results in presence of martensite in HAZ. It was shown that in the scope of the performed tests, the maximum hardness of HAZ did not exceed the critical value for the material group, and the increase in heat input caused the decrease of hardness by about 25 HV10.
Źródło:
Advances in Science and Technology. Research Journal; 2021, 15, 3; 288-296
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fuzzy identification of the reliability state of the mine detecting ship propulsion system
Autorzy:
Pająk, Michał
Muślewski, Łukasz
Landowski, Bogdan
Grządziela, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/259740.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ships
rotational system
mutual correlation
non-coaxiality
fuzzy clusters
Opis:
The study presents the evaluation and comparative analysis of engine shaft line performance in maritime transport ships of the same type. During its operation, a technical system performs functions for which it was designed. It goes through different states. Dynamic state changes of a rotational system can be identified by means of its vibration measurement. For this purpose, a research was carried out which involved recording vibrations of the analysed rotational systems. The recordings were used for calculating selected characteristics in the time-domain, where one of the most unique is the value of the normalized mutual correlation function. On the basis of the concentration values, the characteristics which unambiguously determine the ability state were selected for further studies. Then an identification method for rotational system non-coaxiality was proposed. The method involves using fuzzy clustering. According to this method the values of input signal characteristics were used to formulate fuzzy clusters of system ability and inability states. The method can be used for identifying the current state of the system. The study presents the results of the application of this method in engine turbine shaft lines of minesweepers, with the rotational system selected as an example. It needs to be noted that the efficiency of identifying the operating state of the system with this method is higher than with other methods described in the literature by authors who deal with this issue. The research results have a significant impact on the evaluation of mechanical properties of the studied objects and directly affect operational states of mechanical systems, including those installed in minesweepers, thus determining their reliability.
Źródło:
Polish Maritime Research; 2019, 1; 55-64
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-6 z 6

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