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Wyszukujesz frazę "design optimisation" wg kryterium: Temat

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    Wyświetlanie 1-8 z 8
    Tytuł:
    Greedy randomised adaptive search procedures for topological design of MPLS networks
    Autorzy:
    Mysłek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/309269.pdf
    Data publikacji:
    2002
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    network design
    optimisation
    MPLS
    GRASP
    local search
    Opis:
    In this paper, the IP/MPLS network cost optimisation problem of selecting localisation of nodes and links, combined with link's dimensioning, is discussed. As the considered problem is hard, we discuss and propose greedy randomised adaptive search procedure (GRASP) based solution method. GRASP is an iterative randomised sampling technique which combines adaptive randomised greedy function in constructing initial solution with local search optimisation. The effectiveness of the method is illustrated by means of a numerical study. We compare the GRASP results with results for both exact and heuristic methods obtained in previous research concerning topological design problem.
    Źródło:
    Journal of Telecommunications and Information Technology; 2002, 2; 26-32
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    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:
    Main Particulars Optimisation of a Sea-Going Ferry for a Given Shipping Route
    Autorzy:
    Artyszuk, Jarosław
    Gucma, Stanisław
    Powiązania:
    https://bibliotekanauki.pl/articles/504240.pdf
    Data publikacji:
    2015
    Wydawca:
    Międzynarodowa Wyższa Szkoła Logistyki i Transportu
    Tematy:
    ferry
    ro-pax
    design
    optimisation
    ship manoeuvring
    simulation
    Opis:
    The paper presents a two-stage optimisation approach of sea-going ferry main particulars intended for a particular route. The method is especially suited for determining owner's specific design requirements. The goal of the first stage is a maximisation of cargo capacity, mostly in terms of the total lane length. Empirical method based on the fleet statistics of existing ferries is used throughout the stage one. The objective function of the second stage are the capital and service costs of a ferry, which are to be minimised. The solution of the latter optimisation will essentially involve a ship manoeuvring motions simulation.
    Źródło:
    Logistics and Transport; 2015, 25, 1; 57-62
    1734-2015
    Pojawia się w:
    Logistics and Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and optimisation of exhaust system of light turboprop airplane
    Autorzy:
    Stalewski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/247804.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    turboprop aircraft
    exhaust system
    ejector
    computer-aided design
    optimisation
    Opis:
    Innovative exhaust system for light turboprop airplane has been developed and optimised. Apart from the basic function of removing exhaust from turboprop engine, the system supports cooling of the engine bay. To do this, the system removes hot air from the engine bay, utilising the ejector-pump effect, where the exhaust stream generates under-pressure, sucking the hot air through the ejector slot and removes the air together with the exhaust gases. The design and optimisation of the exhaust system has been conducted based on computational methods of Computer-Aided Design and Optimisation and Computational Fluid Dynamic. Three-dimensional analysis of flow around the airplane (including effect of propeller) and inside the exhaust system was conducted by application of URANS solver ANSYS FLUENT. Using these software the trajectories of exhaust particles, both inside the exhaust ducts and outside the airplane, have been determined. Parametric model of the designed exhaust system has been developed using the in-house software PARADES. As design parameters the diameter, length and direction of exhaust ducts as well as few parameters describing a shape of the ejector, have been established. The optimisation process aimed at designing of the exhaust system, which removes the exhaust gases possibly far away from the airframe, especially during a descent flight of the airplane. Additional objectives were maximisation of the mass flow rate of hot air sucked through the ejector and minimisation of the drag force generated by external part of the exhaust system. The optimised exhaust system should have also fulfilled requirements of permissible total-pressure losses inside the exhaust ducts. The optimised exhaust system has been implemented on the light turboprop airplane and validated during flight tests.
    Źródło:
    Journal of KONES; 2016, 23, 2; 341-348
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stability criteria as constraints in a fleet of ships optimisation problem
    Autorzy:
    Oleksiewicz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/962812.pdf
    Data publikacji:
    2004
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    maritime transportation
    computer-aided ship design
    optimisation
    intact stability criteria
    Opis:
    The paper has been written within the European EUREKA Project E!2772, initiated and completed at the Faculty of Ocean Engineering & Ship Technology, Gdansk University of Technology in the years 2001-2003. A problem has been solved concerning mathematical optimisation of a fleet of multipurpose sea-river vessels for European short-shipping reguIlar lines, in the area of The North and Baltic Seas, on the level of marine transportation , task, by the non-linear programming methods with constraints. A method is proposed which enables existing criteria of stability to be included as constraints in the optimisation model of a jleet. In the numerical examples, three typical criteria of intact stabiliry: by IMO, PRS, and HSMB have been selected to demonstrate a post-optimisation feasibility analysis of principal parameters of ships.
    Źródło:
    Polish Maritime Research; 2004, S 1; 39-53
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and optimisation of main rotor for ultralight helicopter
    Autorzy:
    Stalewski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/243641.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    rotorcraft
    ultralight helicopter
    main rotor
    airfoil
    computer-aided design
    optimisation
    Opis:
    A modern main rotor, dedicated to the ultralight helicopter, has been designed and optimised. Due to assumed simplicity of the rotor design and taking into account some technological constraints, the principal purpose of the presented research was to design a dedicated airfoil which, when applied on the main-rotor blades, would influence satisfactory improvement in a performance of the ultralight helicopter, especially in fast flight. The design and optimisation process has been supported by a computational methodology. The in-house software has been used for direct and inverse design of shapes of the rotor-blade airfoils. Aerodynamic properties of the airfoils as well as the helicopter main rotor were evaluated based on both the two-dimensional and three-dimensional flow simulations conducted using the ANSYS FLUENT software that was used to solve U/RANS equations. Based on the results of conducted computational simulations of fast flight of the ultralight helicopter, it can be concluded that the newly designed main rotor, compared to the baseline, may give certain improvement in helicopter performance in fast flight. In addition, the application of this newly designed rotor may lead to increase of a maximum speed of the helicopter flight, due to the greater lift force achievable by this rotor on the retreating blade, which is favourable from point of view of keeping of a lateral balance of the helicopter in fast flight.
    Źródło:
    Journal of KONES; 2017, 24, 4; 287-295
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computational design and optimisation of innovative, high-efficiency wind turbine
    Autorzy:
    Stalewski, W.
    Zalewski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/246604.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    green power
    wind turbine
    computational fluid dynamics (CFD)
    computer-aided design
    optimisation
    Opis:
    New concept of innovative, high-efficiency wind turbine has been developed and optimised. The turbine consists of a rotor with a vertical axis of rotation and a ring-palisade casing, which task is to deflect wind stream so that it flows perpendicularly to the rotor plane. The main advantage of such configuration of a wind turbine is that due to the vertical axis of symmetry, it works independently on the wind direction and it does not need any mechanism directing it towards the wind. The greatest challenge when designing the turbine was to minimise losses of energy of the wind stream deflected by 90 degrees by the ring vanes of the casing. This involved optimisation of number, shapes and mutual positions of the ring vanes. The whole optimisation works were done based on computational methods of Computer-Aided Design and Optimisation and Computational Fluid Dynamic. Subsequent variants of the ring-palisade casing were designed using an appropriately adapted in-house-software package supporting design and optimisation of multi-element airfoils. Three-dimensional analysis of flow around and inside the casing was conducted by application of commercial URANS solver ANSYS FLUENT. Eventually designed turbine is characterised by high efficiency in respect of acceleration of the wind stream. On the basis of computer simulations, it is estimated that the average velocity of air stream flowing through the rotor plane may be higher than the wind speed by about 45%. Extent of the acceleration of the wind stream partially depends on the number of ring vanes comprising a casing. Depending on specificity of application, this number of ring vanes may be chosen by a compromise between performance and dimensions of the turbine. The proposed wind turbine seems to be very promising solution, especially within the area of small and moderate renewable-energy sources, which in particular may be placed directly in residential-building areas, e.g. on the roofs of houses. This type of renewable-energy sources may also be successfully used in the field of environmentally friendly transport, in the process of producing hydrogen as fuel for fuel cell vehicles.
    Źródło:
    Journal of KONES; 2015, 22, 2; 221-232
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design parameters optimisation of ROPAX ferry using seakeeping characteristics and additional wave resistance
    Optymalizacja parametrów projektowych promu pasażersko-samochodowego pod kątem wybranych właściwości morskich i dodatkowego oporu na fali
    Autorzy:
    Cepowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/257284.pdf
    Data publikacji:
    2008
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
    Tematy:
    właściwości morskie
    prom ro-ro
    kołysanie boczne
    przyspieszenie poprzeczne
    dodatkowy opór na fali
    parametry projektowe
    sztuczna sieć neuronowa
    optymalizacja wielokryterialna
    metoda Pareto
    logika rozmyta
    sea-keeping
    ro-pax ferry
    rolling
    motion sickness index
    additional wave resistance
    design parameters
    artificial neuron network
    optimisation
    Pareto method
    fuzzy logic
    Opis:
    This paper presents the multi-criteria design parameters of the optimisation of the ROPAX ferry using sea-keeping characteristics and additional wave resistance. The design criteria were formed using the method based on deterministic scenario and the partial objective functions were determined as artificial neuron networks. The design parameters' optimisation was carried out with the Pareto method. The best design variants were chosen using the elements of fuzzy logic that allowed, among other things, to present design quality with linguistic variables. This approach allowed choosing the best variant concerning all criteria at the same time.
    W artykule przeprowadzono wielokryterialną optymalizację parametrów projektowych promu pasażersko-samochodowego pod kątem wybranych właściwości morskich i dodatkowego oporu statku na fali. Kryteria projektowe sformułowano posługując się metodą opartą na scenariuszach deterministycznych, natomiast funkcje celów cząstkowych wyznaczono w postaci sztucznych sieci neuronowych. Optymalizację parametrów projektowych przeprowadzono metodą Pareto. Do wyboru najlepszych wariantów projektowych wykorzystano elementy logiki rozmytej, co pozwoliło m.in. na przedstawienie walorów projektu za pomocą zmiennych lingwistycznych. Takie podejście umożliwiło wybór wariantu najlepszego pod kątem wszystkich kryteriów jednocześnie.
    Źródło:
    Problemy Eksploatacji; 2008, 2; 149-158
    1232-9312
    Pojawia się w:
    Problemy Eksploatacji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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