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    Wyświetlanie 1-13 z 13
    Tytuł:
    Topological classes of statically determinate beams with arbitrary number of supports
    Klasy topologiczne statycznie wyznaczalnych belek o dowolnej liczbie podpór
    Autorzy:
    Kozikowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/279355.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    statically determinate beams
    topology optimization
    geometry optimization
    equivalence classes
    Opis:
    The paper presents all topologies of statically determinate beams with arbitrary number of pin supports. The geometry of each beam with a fixed topology is optimized by a genetic algorithm, with absolute maximum moment as the objective function. An equality relation between minimum values of this function is defined on the set of all topologies as an equivalence relation. This relation partitions the set of topologies into equivalence classes, called topological classes, for uniform, linear and parabolic gravity loads. An in-depth description of these classes is provided. Exact formulas for optimal locations of supports and hinges are found for the uniform load.
    W pracy omówiono wszystkie topologie statycznie wyznaczalnych belek o dowolnej liczbie przegubowych podpór. Geometrię każdej belki o ustalonej topologii zoptymalizowano za pomocą algorytmu genetycznego z bezwzględnie maksymalnym momentem jako funkcją celu. Relację równości minimalnych wartości tej funkcji zdefiniowano na zbiorze wszystkich topologii jako relację równoważności. Na podstawie tej relacji dokonano podziału zbioru topologii na klasy równoważności, zwane klasami topologicznymi, pod równomiernym, linowym i kwadratowym grawitacyjnym obciążeniem. Przedstawiono szczegółową charakterystykę tych klas. Znaleziono ścisłe wzory na optymalne położenie podpór i przegubów belek obciążonych równomiernie.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2011, 49, 4; 1079-1100
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Topological classes of statically determinate beams with arbitrary number of supports under the most unfavourably distributed load
    Autorzy:
    Kozikowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/281725.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    statically determinate beams
    topology and geometry optimization
    equivalence classes
    worst load
    Opis:
    The paper deals with topological classes of statically determinate beams with an arbitrary number of pin supports. The beams carry piece-wisely distributed loads which are placed in such a way that bending moment values are extreme at any section. For such loads, it is sufficient to consider only two load cases with alternate spans uniformly loaded. Each beam with a fixed topology is subjected to geometrical optimization with the absolute maximum moment as the objective function. Exact formulas for optimal values of geometrical parameters are found for all topologies. An equality criterion between minimum values of the objective function is used as an equivalence relation. On the basis of this relation, the set of all topologies is divided into equivalence topological classes. Typical features of these classes are found and discussed.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2014, 52, 1; 257-269
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numeric Wake Equalizing Duct Geometry Optimization for a Given Ship
    Autorzy:
    Martinas, G.
    Cupsa, O.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/117038.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Wake Equalizing Duct (WED)
    WED Geometry Optimization
    Reduction of Emissions
    WED Device
    Design Optimization
    Numeric Optimization Methods
    WED Geometry
    energy saving device
    Opis:
    The reduction of fuel cost has always been one of the key strategic business goals for ship owners and operators. In the current climate of high oil prices, the reduction of fuel costs becomes essential; and furthermore a variety of recent legislations require owners and operators to move towards the reduction of emissions from ships of SOx, NOx and CO. Hence the pressure on designers to achieve both reduced fuel costs and reduced emissions by optimising the hull and propeller has never been higher. In parallel to the performance improvement of new built vessels, there has been great interest in the potential to enhance the performance of existing vessels through retrofit of devices to the hull. In any case for instance the WED device must be customized to fit to the afterbody of the ship in terms of performing its supposed function. The Designer is therefore placed in the front of multiple geometric solutions from between he has to make a choice. This paper is intended to help the Designers to have a rational choosing approach by involving the numeric optimization of the geometry of the WED in order to select the best fitted WED to perform the best in order to achieve some predefined parameters. In this paperwork a given geometry of a WED device is taken and via Design Optimization the geometry of the duct was refined so that better results are achieved with a smaller and more compact WED. In doing so, the Designer is assisted by numeric optimization methods to choose from only three final candidates instead of several thousands in order to provide the best fitted WED geometry for a given ship afterbody.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2015, 9, 2; 243-248
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact on force decrease at the end of actuator plunger motion
    Autorzy:
    Zagirnyak, M.
    Branspiz, Yu.
    Pshenychnyi, A.
    Miljavec, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/140870.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aktuator
    optymalizacja
    metoda elementów skończonych
    siła magnetyczna
    tłumik
    actuator
    geometry optimization
    finite element method
    magnetic force
    damper
    Opis:
    It is shown that decrease and damping of the traction force at the end of the plunger move is possible not only due to application of a special keeper design, but also due to change of the plunger shank geometric form. The computer modeling with the use of finite element method is used to analyze the influence of system geometry on force distribution along plunger movement. The damping effect is confirmed when special shape plunger shanks are used.
    Źródło:
    Archives of Electrical Engineering; 2011, 60, 2; 129-135
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    3d design procedure, fem analyses and optimization of the tiller’s sprocket
    Autorzy:
    Tucki, K.
    Sikora, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/411339.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    tiller’s sprocket
    geometry
    modelling
    optimization
    agriculture
    Opis:
    This article present selected issued of the analysis of the computer modelling of the tiller’s sprocket with the Solid Edge ST software. The geometry presented in the article was prepared so that they may be used to perform simulation presenting the influence of the loads generated by the ground work on the distribution and values of the stress forces within the tiller’s sprocket - Finished Element Method. The analysis covered the sprockets subjected to the forces of: 200N, 400N, 600N, 800N and 1000N. Geometric models were developed based on the available catalogue materials and the Polish Standard PN+92/R-58051-1. The FEM analyses performed allowed suggesting solutions to optimise the whole geometry in terms of the strengths.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2016, 5, 3; 59-70
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modification of the Tooth Geometry of a Polymer GEAR with a Straight Tooth Line to Adjust the Torque Transmission Capability in One Direction Only
    Autorzy:
    Strojny, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/2081498.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    gears
    tooth strength
    tooth geometry modification
    topological optimization
    kinetic simulation
    Opis:
    This paper describes a methodology for modifying a tooth for the ability to transmit torque in one direction only. It presents two methods (analytical and numerical) of tooth mass reduction while maintaining functional features of the whole transmission. The results of the above mentioned methodology are presented on the example of a mass-produced transmission.
    Źródło:
    Technical Sciences / University of Warmia and Mazury in Olsztyn; 2021, 24(1); 157-170
    1505-4675
    2083-4527
    Pojawia się w:
    Technical Sciences / University of Warmia and Mazury in Olsztyn
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of nozzle geometry on fluid flow parameters
    Autorzy:
    Penkov, I.
    Aleksandrov, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1839781.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    przepływ płynu
    optymalizacja
    geometria dyszy
    fluid flow simulation
    nozzle geometry
    optimization
    Opis:
    The article discusses ways for optimization of a standard nozzle cup design to achieve a narrower paint flow. The analysis of a standard nozzle cup shows that distribution of air pressure is critically uneven both along the nozzle axis and in the radial direction. A decrease in pressure is about 45% at the distance of 2 mm from the front surface of the nozzle cup. Air pressure decreases about 40% at the distance of 2 mm from the nozzle axis in the radial direction. Air velocity decreases about 52% at the distance of 4 mm from nozzle surface but then the velocity stabilizes and decreases is about 59% at the distance of 10 mm from the nozzle surface in comparison to its magnitude on the nozzle surface. Six extra holes and a circular rim were added to the standard nozzle cup to obtain paint stream as narrow as possible. Also was modified inner surface of the nuzzle cup. Totally, four different components were analysed. The results show that with increasing the nozzle cone by fifteen or more degrees, the pressure distribution decreases. Most optimal solution has six small holes around the nozzle hole and a small rim covering all holes. In this case, pressure decreases only 3% in the axial direction and 4% in the radial direction at the distance of 2 mmfrom the front surface of the nozzle. Distribution of air velocity is still significant but its magnitude is about 35% ... 45% less than at the standard nozzle cup.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2020, 25, 4; 214-222
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A neural-network controlled dynamic evolutionary scheme for global molecular geometry optimization
    Autorzy:
    Styrcz, A.
    Mrozek, J.
    Mazur, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/907520.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    optymalizacja globalna
    algorytm memetyczny
    geometria cząsteczki
    global optimization
    memetic algorithm
    molecular geometry
    Opis:
    A novel, neural network controlled, dynamic evolutionary algorithm is proposed for the purposes of molecular geometry optimization. The approach is tested for selected model molecules and some molecular systems of importance in biochemistry. The new algorithm is shown to compare favorably with the standard, statically parametrized memetic algorithm.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2011, 21, 3; 559-566
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transformation of metric space tools for transport logistics
    Autorzy:
    Wierzcholski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/244393.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    transport logistics
    access road
    metric spaces
    optimization
    non-Euclidean geometry
    transport engineering applications
    Opis:
    The numerous logistics problems occurring in power train and transport industry lead to wear of vehicles and trains as well as the road or tracks length. The choice of the proper transport requires selecting the kind of the optimum length of the way. For facilities for transport of bulk commodity, very important meaning has the distance between the place of outgoing (x) and delivery point (y). Such problem will be referring for the one, two and three spaces in the case of land transport for road and rail vehicles as well as sea and air transport for ships and airplane. It is desired that the transport from outgoing point (x) to delivery place (y) ought to be travelled on the shortest way in the presenting geometry sense. In transport, logistics denotes it the least distance between the place of the drive beginning (outgoing) and the place of drive end (delivering place). It is evident that the shortest distance between two points is always if we define this distance in Euclidean geometry sense because Euclidean metric determines the shortest distance between two points. In various transport problems the shortest distance in Euclidean sense, between two various places is not realistic and not possible. Therefore for transport vehicles exists many possibilities of various kinds of access road in Euclidean and non- Euclidean geometry. After Authors, suggestion very interesting is to find the optimum way or optimum track between the trip origin and delivery place. Such problem demands the more and more information referring the describing the tracks geometry using metric space theory. In this article, especially the non-Euclidean modulus Taxi–Car metrics is considered. Presented metric spaces and their properties are needed and applied in practical transport problems occurring among other in assembly rooms where the way of intelligent shortest truck must be considered. Moreover, in this article the various communication ways will be presented and will be suggested an algorithm construction of the optimum distance problem solutions in non-Euclidean geometry presenting the equivalent and simultaneously most simple communication tracks.
    Źródło:
    Journal of KONES; 2016, 23, 1; 413-420
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On Rapid Re-Design of UWB Antennas with Respect to Substrate Permittivity
    Autorzy:
    Koziel, S.
    Bekasiewicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/221869.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    antenna design
    geometry scaling
    simulation-driven optimization
    surrogate modeling
    inverse modeling
    substrate properties
    Opis:
    Re-design of a given antenna structure for various substrates is a practically important issue yet non trivial, particularly for wideband and ultra-wideband antennas. In this work, a technique for expedited redesign of ultra-wideband antennas for various substrates is presented. The proposed approach is based on inverse surrogate modeling with the scaling model constructed for several reference designs that are optimized for selected values of the substrate permittivity. The surrogate is set up at the level of coarse-discretization EM simulation model of the antenna and, subsequently, corrected to provide prediction at the high-fidelity EM model level. The dimensions of the antenna scaled to any substrate permittivity within the region of validity of the surrogate are obtained instantly, without any additional EM simulation necessary. The proposed approach is demonstrated using an ultra-wideband monopole with the permittivity scaling range from 2.2 to 4.5. Numerical validation is supported by physical measurements of the fabricated prototypes of the re-designed antennas.
    Źródło:
    Metrology and Measurement Systems; 2016, 23, 4; 513-520
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optymalizacja geometrii głowicy tnącej obrabiarki water-jet z wykorzystaniem metody elementów skończonych
    Geometry optimization of water-jet machine cutting head using finite element method
    Autorzy:
    Szczepanik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/952698.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    optymalizacja
    MES (metoda elementów skończonych)
    obróbka wodno-ścierna
    parametry geometryczne
    optimization
    FEM
    waterjet machining
    geometry parameters
    Opis:
    W artykule przedstawiono proces optymalizacji postaci geometrycznej głowicy tnącej obrabiarki water-jet z wykorzystaniem oprogramowania ANSYS Workbench. Celem badań było sprawdzenie jaki wpływ mają zmiany poszczególnych wymiarów na zmianę parametrów przepływu strugi wodno-ściernej. Analiza statystyczna wyników pozwoli ograniczyć stopień skomplikowania modelu w późniejszych badaniach zbiorczych poprzez pominięcie nieistotnych parametrów.
    The article presents optimization process of water-jet cutting head geometry using ANSYS Workbench software. The aim of study was to examine influence of specific dimensions on output abrasive stream flow parameters. Statistical analysis of the results will help to reduce the complexity of the model in the later studies by omitting irrelevant parameters.
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2014, 2; 53-56
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Synthesis of Dwell Mechanisms on the Basis of Straight-Line Linkages with Fivefold Interpolation Nodes
    Autorzy:
    Kharzhevskyi, Viacheslav
    Pashechko, Mykhaylo
    Tatsenko, Oleksandr
    Marchenko, Maksym
    Nosko, Pavlo
    Powiązania:
    https://bibliotekanauki.pl/articles/2024214.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    straight-line linkages
    kinematic geometry
    dwell mechanisms
    fivefold interpolation nodes
    optimization synthesis
    połączenia prostoliniowe
    geometria kinematyczna
    węzły pięciokrotnej interpolacji
    synteza optymalizacyjna
    Opis:
    The paper deals with the problem of kinematic synthesis of dwell linkage mechanisms which are based on the four-bar linkage with a coupler point that traces a curve with a straight-line part. It enables to obtain a dwell of the output link of the mechanism, but the main goal is to find such parameters of the mechanisms that hold the required conditions of the designer: necessary dwell time, to satisfy the necessary cyclogram of the machine with taking into account the number of additional parameters. The main problem is to carry out the kinematic synthesis of the basic straight-line linkage that can be done by the kinematic geometry methods. In this paper it was shown that the fivefold interpolation nodes of the coupler curve with the tangent line can be successfully used to satisfy the necessary criteria. As a result of the carried out studies, the regions of existence of such mechanism parameters were determined enabling to carry out an optimization procedure using different criteria.
    Źródło:
    Advances in Science and Technology. Research Journal; 2021, 15, 1; 18-25
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The modernization of the rate of descriptive geometry
    O modernizacji kursu geometrii wykreślnej
    Autorzy:
    Kaygorodtseva, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/119163.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Geometrii i Grafiki Inżynierskiej
    Tematy:
    multidimensional geometry
    geometric modeling
    engineering education
    process optimization
    multi-factor processes
    geometria wielowymiarowa
    modelowanie geometryczne
    kształcenie inżynierów
    optymalizacja procesów
    wieloczynnikowe procesy
    Opis:
    Set out the reasons and prerequisites for the need to modernize the training course in descriptive geometry through the introduction of mathematical tools to formalize and algorithmic geometrical graphic preparation for future engineers for the successful solution of modern technical and research tasks.
    Podano propozycję nowego podejścia do nauczania geometrii wykreślnej poprzez wprowadzenie sformalizowanego aparatu matematycznego i symboliczne przedstawianie warunków geometrycznych w celu określenia optymalnego algorytmu graficznego gwarantującego pomyślne rozwiązania współczesnych zagadnień technicznych i badawczych.
    Źródło:
    Journal Biuletyn of Polish Society for Geometry and Engineering Graphics; 2012, 23; 7-10
    1644-9363
    Pojawia się w:
    Journal Biuletyn of Polish Society for Geometry and Engineering Graphics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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