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Tytuł:
The analysis of overall ship fuel consumption in acceleration manoeuvre using hull-propeller-engine interaction principles and governor features
Autorzy:
Zeraatgar, Hamid
Ghaemi, M. Hossein
Powiązania:
https://bibliotekanauki.pl/articles/258468.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
modelling and simulation
fuel consumption
hull-propeller-engine interactions
ship propulsion system
governor
control strategy
Opis:
The problem of reduction of greenhouse gas emissions in shipping is currently addressed by many research works and related industries. There are many existing and visionary technologies and ideas, which are conceptually defined or practically realised. This goal can be achieved in different ways, and reducing fuel consumption is one of the major methods. In these circumstances, the aim of this study is to analyse the possibility of fuel consumption reduction by using an alternative control strategy for low-speed marine diesel engines which would take into account the interactions between hull, propeller and main engine. For this purpose, a mathematical model including ship hull and propulsion system is developed. A case study is conducted for a ship for which the results of both the ship hull and screw propeller model tests are available. A low-speed two-stroke diesel engine is then selected for the considered ship. Two different governors are included in the model and their parameters are changed to investigate the dynamic behaviour of the system when simulating the forward acceleration mode in calm sea conditions. The research is mainly focused on variations of fuel consumption by the ship passing a certain distance to reach the nominal constant speed. It is concluded that, for a given travel distance, it is possible to save considerable amount of fuel at the expense of slight increase of journey time.
Źródło:
Polish Maritime Research; 2019, 1; 162-163
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Selected Strategies of Statistical Quality Control
Autorzy:
Worwa, K.
Powiązania:
https://bibliotekanauki.pl/articles/409302.pdf
Data publikacji:
2015
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
Statistical Quality Control
Control Strategy
Control Effectiveness
Opis:
The paper presents the results of a comparative analysis of the two methods of statistical quality control of products. That two methods differ from each other mainly by a way of determining a subset of products subjected to inspection. The first of the two methods, hereinafter referred to as the completely random method, is to draw a certain number of products for control of the entire products population. The second method, called the method of drawing from partitions, is a pre-split across the specific products population into smaller parts, called partitions, and then create a representation (sample) of the products subject to control by drawing the products from each partition. The main result of this study is to determine the conditions for which the effectiveness of quality control methods with drawing from partitions is not less than the efficiency of the method with fully random drawing, whereby the efficiency criterion is the likelihood of the event, consisting in the fact that there is at least one incorrect product among the drawn products. The considerations were illustrated by numerical examples, designed to compare the effectiveness of the analyzed methods of quality control.
Źródło:
Research in Logistics & Production; 2015, 5, 4; 337-346
2083-4942
2083-4950
Pojawia się w:
Research in Logistics & Production
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical study on control strategy of a single cell proton conducting solid oxide fuel cell
Autorzy:
Szczęśniak, Arkadiusz
Powiązania:
https://bibliotekanauki.pl/articles/41176203.pdf
Data publikacji:
2022
Wydawca:
Politechnika Warszawska, Instytut Techniki Cieplnej
Tematy:
solid oxide fuel cell
H+SOFC
control strategy
numerical simulations
ogniwo paliwowe ze stałym tlenkiem
strategia kontroli
symulacje numeryczne
Opis:
The aim of the paper is to examine a control strategy for a single proton conducting solid oxide fuel cell (H+SOFC). The study is based on a dynamic model originating from the steady state reduced order model of H+SOFC. The proposed control strategy is based on a singular PID controller that controls the amount of air delivered to the cathode side of the fuel cell. Additionally, fuel mass flow is correlated with current density to achieve a fixed fuel utilization factor. The concept was tested on typical operating scenarios such as load-follow mode. The study revealed that the singular PID controller is reliable and ensures a safe H+SOFC operation.
Źródło:
Journal of Power Technologies; 2022, 102, 4; 1-8
1425-1353
Pojawia się w:
Journal of Power Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A strategy of chemical control of Apera spica-venti L. resistant to sulfonylureas traced on the molecular level
Autorzy:
Stankiewicz-Kosyl, M.
Wrochna, M.
Salas, M.
Gawronski, S.W.
Powiązania:
https://bibliotekanauki.pl/articles/65897.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
chemical control
control strategy
Apera spica-venti
silky bentgrass
silky bent grass zob.silky bentgrass
resistance
weed control
sulphonylurea
molecular level
Opis:
Three populations of silky bent grass (Apera spica-venti L.) were tested – one that is susceptible and two that are resistant to sulfonylureas. Th is study assessed the efficacy of control by different herbicides in a pot experiment and estimated the molecular status of resistance to sulfonylureas in analysed populations and its effect on the effi cacy of different chemical treatments. The three most effective herbicide rotation schemes were: 1) chlorsulfuron + isoproturon, ethametsulfuron + metazachlor + quinmerac, chlorsulfuron + isoproturon; 2) prosulfocarb + difl ufenican, ethametsulfuron + quizalofop-p-ethyl, prosulfocarb + diflufenican; 3) diflufenican + flufenacet, quizalofop-p-ethyl, diflufenican + flufenacet. In most cases it was more difficult to destroy 100% of the resistant population from Modgarby where the majority of plants had no mutation in the als gene. In the resistant population from Babin there were signifi cantly more individuals with mutation in the als gene, therefore exhibiting target-site resistance.
Źródło:
Journal of Plant Protection Research; 2017, 57, 2
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Born in the Ashes: Nuclear Uncertainties ‘Increasing’ Strategic Stability
Zrodzeni w popiołach: niepewność jądrowa „zwiększa” stabilność strategiczną
Autorzy:
Sinovets, Polina
Melnyk, Tetiana
Powiązania:
https://bibliotekanauki.pl/articles/1179121.pdf
Data publikacji:
2020-12-31
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
strategic stability
deterrence
arms control
missile technologies
artificial intelligence
space
nuclear strategy
US nuclear posture
Russian nuclear posture
stabilność strategiczna
odstraszanie
kontrola zbrojeń
technologie rakietowe
sztuczna inteligencja
przestrzeń
strategia nuklearna
postawa nuklearna USA
postawa nuklearna Rosji
Opis:
The article explores the challenges that strategic stability is facing under the new nuclear world order. These are conceptual deviations from Cold War-framed deterrence theory, technological breakthroughs and critical transformations of states’ nuclear postures. Contrary to the existing publications on this issue, we claim that strategic stability will continue under the new nuclear order and might even be strengthened by the complex combination of security challenges, given the growing impossibility to de-escalate war once it breaks out.
Artykuł analizuje wyzwania, jakie przed stabilnością strategiczną stawia nowy nuklearny porządek świata, obejmujące koncepcyjne warianty teorii odstraszania w ramach zimnej wojny, przełom technologiczny i krytyczną transformację postaw nuklearnych państw. Wbrew dotychczasowym publikacjom na ten temat twierdzimy, że w nowym porządku nuklearnym stabilność strategiczna zostanie utrzymana, a nawet może wzmocniona przez złożoną kombinację wyzwań, jakie stoją przed bezpieczeństwem, biorąc pod uwagę rosnącą niemożność deeskalacji wojny po jej wybuchu.
Źródło:
Przegląd Strategiczny; 2020, 13; 43-59
2084-6991
Pojawia się w:
Przegląd Strategiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling concept of NxM matrix converter under periodic control for dynamic states
Autorzy:
Sieńko, T.
Sobczyk, T. J.
Powiązania:
https://bibliotekanauki.pl/articles/141505.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Matrix converter
control strategy
symmetrical components
equivalent Scheme
Opis:
This paper presents a concept of an NxM Matrix Converter (MC) modeling under periodic control strategy patented in Poland. This strategy allows to change an Nphase input system of voltages and current with the frequency fi to the M-phase output system with the frequency fo, maintaining both systems symmetrical and providing small distortions of voltage and current waveforms at rather high frequencies. In this paper the control strategy is extended for dynamic states when one of the frequencies is changed. Matrix converter equations have been derived using the constrain matrix, which is determined by the switch states. The equations have the hybrid form of a multi-port circuit. To simplify these equations the symmetrical components of input and output voltages and currents have been applied. As a result, rather simple equations have been found. They can be interpreted to an equivalent scheme. All considerations are illustrated using an exemplary 6H3 matrix converter.
Źródło:
Archives of Electrical Engineering; 2014, 63, 2; 305-315
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal production of electrolytic copper determined by the concentration and distribution of copper concentrates to smelters on the example of KGHM
Optymalizacja produkcji miedzi elektrolitycznej poprzez system wzbogacania i dystrybucji koncentratów do hut na przykładzie KGHM
Autorzy:
Saramak, D.
Powiązania:
https://bibliotekanauki.pl/articles/351479.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
optymalizacja
strategia produkcji miedzi
programowanie nieliniowe
sterowanie
modelowanie
optimization
copper production strategy
nonlinear programming
process control
modelling
Opis:
The issues of copper production strategy for the Polish copper industry are presented in the article. The problem is considered within the scope of the ore extraction, ore concentration and metallurgical processing of the copper concentrate and the main aim is to produce the specific amount of copper, which generates maximum technological and economic benefits. In order to determine the strategy of production for a company an optimisation approach may be applied with the target function defined as either the maximization of metal recovery or the maximization of profit. The real operating conditions are implemented into the model, together with existing limitation resulting from the concentration technology and metallurgical treatment. The problem verification was possible with using of non-linear programming theory. Two variants were considered: the first for lower production costs, and the second for low stock market prices. The presented optimal strategies determine the copper grades of concentrates as well as the system of concentrates distribution between three smelters. Generally smelters should receive concentrates with higher copper grades for low stock market metal prices and for low processing costs the mass of concentrates delivered to smelters should be higher together with decreased the copper grades.
W pracy przedstawiono zagadnienia dotyczące strategii produkcji miedzi elektrolitycznej dla polskich warunków produkcji miedzi w układzie kopalnia-zakład przeróbczy-huta miedzi. Problem jest rozpatrywany głównie z punktu widzenia hut miedzi, ale determinowany jest jakością i ilością koncentratów miedziowych wyprodukowanych przez zakłady przeróbcze. Celem jest osiągniecie maksymalnych efektów technologicznych i ekonomicznych. Podejście optymalizacyjne zakłada zbudowanie odpowiedniego modelu ekonometrycznego z funkcja celu zdefiniowaną jako maksymalny odzysk metalu oraz uwzględnieniem istniejących realnych ograniczeń technologicznych Weryfikacja modelu jest możliwa z wykorzystaniem oprogramowania działającego w oparciu o teorię programowania nielinowego. W artykule przedstawiono analizę dla dwóch wariantów produkcji miedzi: niskich kosztów produkcyjnych oraz niskich cen giełdowych miedzi. Aby maksymalizować funkcję celu w zaprezentowanym modelu, w okresie niskich cen produkcji huty powinny otrzymywać mniej koncentratów o wyższej zawartości miedzi, natomiast przy niskich giełdowych cenach miedzi, huty powinny przerabiać większe ilości koncentratu o zmniejszonej zawartości miedzi.
Źródło:
Archives of Metallurgy and Materials; 2011, 56, 3; 619-626
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fire management on container ships: new strategies and technologies
Autorzy:
Ricci, S.
Ravikumar, B.
Rizzetto, L.
Powiązania:
https://bibliotekanauki.pl/articles/24201466.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
fire safety
container ship
drone
CCTV
fiber optic
control strategy
cargo safety
maritime transport
Opis:
Design and construction of container ships follow consolidated requirements, with standard consideration of fire management. Indeed, cargo fires can have important consequence on crewmembers and cargoes, as well as impacting coastal zone and marine environment. Innovative strategies include prevention of events and mitigation of consequences. Digital solutions, providing with situational pictures onboard and around the vessel are fundamental for new fire management solutions, seamless and integrated into the vessel IT infrastructure, according to IMO regulations and the recent EMSA CARGOSAFE Report. The assessment of these solutions requires theoretical evaluation, validation activities in simulated environment and demonstration activities in real environments, with use cases to prove feasibility and benefits. This paper, after a review of traditional preventing and mitigating solutions against fire and an analysis of container ships fires, proposes applicable innovative technologies and operational measures, emerging problems for their potential implementation and requirements for virtual and real tests design.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 2; 415--421
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Backward motion planning and control of multiple mobile robots moving in tightly coupled formations
Autorzy:
Ramanathan, Kuppan Chetty
Mohan, Manju
Dhanraj, Joshuva Arockia
Powiązania:
https://bibliotekanauki.pl/articles/1956065.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
multi-robot systems
formation control
behavior-based control
switching strategy
Stateflow
systemy wielorobotowe
kontrola formacji
kontrola behawioralna
strategia przełączania
Opis:
This work addresses the development of a distributed switching control strategy to drive the group of mobile robots in both backward and forward motion in a tightly coupled geometric pattern, as a solution for the deadlock situation that arises while navigating the unknown environment. A generalized closed-loop tracking controller considering the leader referenced model is used for the robots to remain in the formation while navigating the environment. A tracking controller using the simple geometric approach and the Instantaneous Centre of Radius (ICR), to drive the robot in the backward motion during deadlock situation is developed and presented. State-Based Modelling is used to model the behaviors/motion states of the proposed approach in MATLAB/STATEFLOW environment. Simulation studies are carried out to test the performance and error dynamics of the proposed approach combining the formation, navigation, and backward motion of the robots in all geometric patterns of formation, and the results are discussed.
Źródło:
Applied Computer Science; 2021, 17, 3; 60-72
1895-3735
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic programming in constrained Markov decision
Autorzy:
Piunovskiy, A. B.
Powiązania:
https://bibliotekanauki.pl/articles/970861.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
optymalizacja
programowanie dynamiczne
system kolejek
Markov decision process (MDP)
constraints
optimization
dynamic programming
myopic control strategy
queuing system
Opis:
We consider a discounted Markov Decision Process (MDP) supplemented with the requirement that another discounted loss must not exceed a specified value, almost surely. We show that he problem can be reformulated as a standard MDP and solved using the Dynamic Programming approach. An example on a controlled queue is presented. In the last section, we briefly reinforce the connection of the Dynamic Programming approach to another close problem statement and present the corresponding example. Several other types of constraints are discussed, as well.
Źródło:
Control and Cybernetics; 2006, 35, 3; 645-660
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation and experimental results of hybrid electric machine with a novel flux control strategy
Autorzy:
Paplicki, P.
Wardach, M.
Bonisławski, M.
Pałka, R.
Powiązania:
https://bibliotekanauki.pl/articles/140694.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
PM machines
FEM analysis
experimental results
control strategy
field control capability
efficiency maps
Opis:
The paper presents selected simulation and experimental results of a hybrid ECPMS-machine (Electric Controlled Permanent Magnet Synchronous Machine). This permanent magnets (PMs) excited machine offers an extended magnetic field control capability which makes it suitable for battery electric vehicle (BEV) drives. Rotor, stator and the additional direct current control coil of the machine are analyzed in detail. The control system and strategy, the diagram of power supply system and an equivalent circuit model of the ECPMS-machine are presented. Influence of the additional excitation on the performance parameters of the machine, such as: torque, efficiency, speed limits and back-EMF have also been discussed.
Źródło:
Archives of Electrical Engineering; 2015, 64, 1; 37-51
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of chemical weed control strategies in biomass sorghum
Autorzy:
Pannacci, E.
Bartolini, S.
Powiązania:
https://bibliotekanauki.pl/articles/64978.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
biomass crop
sorghum
Sorghum bicolor
herbicide
weed management
chemical control
weed control
control strategy
Opis:
Two field experimental trials were carried out in central Italy, in 2005 and 2006, on biomass sorghum [Sorghum bicolor (L.) Moench] in order to assess weed control efficacy and selectivity to the crop of some pre- and post-emergence herbicides applied at different doses and in different mixtures. All herbicides showed good selectivity to the crop, although postemergence treatments showed higher transitory phytotoxicity effects than pre-emergence treatments, especially when high temperatures occurred after treatments, decreasing the selectivity of leaf herbicides (i.e. MCPA, 2,4-D, bromoxynil and dicamba). Considering pre-emergence applications, terbuthylazine alone against broadleaves or in mixtures at low doses with s-metolachlor against mixed infestations (grasses + broadleaves), seemed to be the best options to obtain a good selectivity to the sorghum and a high weed control level. Aclonifen showed some limits in terms of weed spectrum and could be recommended only against simplified broadleaf weed infestations without the presence of less susceptible weeds, like Amaranthus retroflexus, Portulaca oleracea and Solanum nigrum. Propachlor seemed not to be advisable due to the low efficacy against all the major broadleaf warmseason weed species in the Mediterranean areas. Considering post-emergence applications, all treatments gave quite similar results in terms of weed control, although, the mixture of terbuthylazine + bromoxynil seemed to be the best option due to bromoxinil’s higher efficacy than other foliar herbicides, such as MCPA, 2,4-D and dicamba, which can increase the efficacy of terbuthylazine alone especially under dry weather conditions. There were no significant differences in sorghum biomass between herbicide treatments, although, the more selective pre-emergence treatments showed, on average, a higher biomass yield value than the less selective post-emergence treatments. For these reasons, biomass values seemed to be more related to herbicide selectivity than to herbicide efficacy, especially in cases of scarce competitiveness of weed flora.
Źródło:
Journal of Plant Protection Research; 2018, 58, 4
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of Optimal Noise Hazard Control Strategy With Budget Constraint
Autorzy:
Monazzam, M. R.
Fard, S. M. B.
Powiązania:
https://bibliotekanauki.pl/articles/90404.pdf
Data publikacji:
2011
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
noise control strategy
noise hazard
optimization
Źródło:
International Journal of Occupational Safety and Ergonomics; 2011, 17, 4; 463-464
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Triple-layer based control strategy for molten carbonate fuel cell - hybrid system
Autorzy:
Milewski, J.
Miller, A.
Powiązania:
https://bibliotekanauki.pl/articles/185632.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
strategia kontroli
control strategy
solid oxide fuel cell
off-design operation
Opis:
Based on mathematical modelling and numerical simulations, a control strategy for a Molten Carbonate Fuel Cell Hybrid System (MCFC-HS) is presented. Adequate maps of performances with three independent parameters are shown. The independent parameters are as follows: stack current, fuel mass flow and compressor outlet pressure. Those parameters can be controlled by external load, fuel valve and turbine-compressor shaft speed, respectively. The control system is purposed to meet many constraints: e.g. stack temperature, steam-to-carbon ratio, compressor surge limitation, etc. The aim is to achieve maximum efficiency of power generated within these constraints. Governing equations of MCFC-HS modelling are given. An operational line of the MCFC-GT system is presented which fulfils several constraints (temperature difference, cell temperature, etc.) The system is able to achieve efficiency of more than 62% even in part-load operation.
Źródło:
Chemical and Process Engineering; 2012, 33, 3; 445-461
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis, simulation and experimental strategies of 5-phase permanent magnet motor control
Autorzy:
Mekri, Fatima
Elghali, Seifeddine Ben
Charpentier, Jean-Frédéric
Powiązania:
https://bibliotekanauki.pl/articles/140704.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
control strategy
constant torque
current references
minimum copper losses
modeling
multi-phase machine
Opis:
This paper presents a study of control strategies for 5-phase permanent magnet synchronous motors (PMSMs) supplied by a five-leg voltage source inverter. Based on the vectorial decomposition of the multi-phase machine, fictitious machines, magnetically decoupled, allow a more adequate control. In this paper, our study focuses on the vector control of a multi-phase machine using a linear proportional-integral-derivative (PID) current regulator in the cases of sinusoidal and trapezoidal back-electromotive force (EMF) waveforms. In order to determine currents’ references, two strategies are adopted. First one aims to minimize copper losses under constant torque, while the second one targets to increase torque for a given copper losses. These techniques are tested under a variable speed control strategy based on a proportional-integral (PI) regulator and experimentally validated.
Źródło:
Archives of Electrical Engineering; 2019, 68, 3; 629-641
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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