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Wyszukujesz frazę "objective theory" wg kryterium: Temat

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    Wyświetlanie 1-3 z 3
    Tytuł:
    Generating a set of compromise solutions of a multi objective linear programming problem through game theory
    Autorzy:
    Sivri, Mustafa
    Kocken, Hale Gonce
    Albayrak, Inci
    Akin, Sema
    Powiązania:
    https://bibliotekanauki.pl/articles/406253.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    multi-objective programming problem
    game theory
    compromise solution
    Opis:
    Most of real-life problems, including design, optimization, scheduling and control, etc., are inherently characterized by multiple conflicting objectives, and thus multi-objective linear programming (MOLP) problems are frequently encountered in the literature. One of the biggest difficulties in solving MOLP problems lies in the trade-off among objectives. Since the optimal solution of one objective may lead other objective(s) to bad results, all objectives must be optimized simultaneously. Additionally, the obtained solution will not satisfy all the objectives in the same satisfaction degree. Thus, it will be useful to generate a set of compromise solutions in order to present it to the decision maker (DM). With this motivation, after determining a modified payoff matrix for MOLP, all possible ratios are formed between all rows. These ratio matrices are considered a two person zero-sum game and solved by linear programming (LP) approach. Taking into consideration the results of the related game, the original MOLP problem is converted to a single objective LP problem. Since there exist numerous ratio matrices, a set of compromise solutions is obtained for MOLP problem. Numerical examples are used to demonstrate this approach.
    Źródło:
    Operations Research and Decisions; 2019, 29, 2; 77-88
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimal allocation of reliability improvement target based on multiple correlation failures and risk uncertainty
    Autorzy:
    Jia, Shuoguo
    Yan, Changfeng
    Kang, Jianxiong
    Xie, Heping
    Wei, Yongqiao
    Powiązania:
    https://bibliotekanauki.pl/articles/24200787.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    multi-objective optimal allocation
    reliability improvement
    correlation failure
    risk uncertainty
    probability measure
    cooperation game theory
    PSO algorithm
    Opis:
    Optimal allocation of the reliability improvement target is essential for the system optimization design. In order to solve the problems that the optimization model is with loss of generality and the validity of the optimal solution is weakened, an optimal allocation method is proposed by considering multiple correlation failures and risk uncertainty in this paper. Two new concepts are presented, such as independent failure results in basic risk, and correlation failure leads to disturbance risk. A risk assessment machinery of “actual risk = basic risk + disturbance risk” is proposed. The action mechanisms of the three correlation failures are studied based on the cooperation game theory, and the generalized risk models are given under probability measure. Considering the improvement cost, the expectation and the variance of the reduction of system risk, a multi-objective optimal allocation model is developed, which is solved by using the PSO algorithm. Finally, the proposed optimal allocation is implemented at the 2-stage NGW planetary reducer, and the results show that it is more efficient and feasible for engineering practice.
    Źródło:
    Eksploatacja i Niezawodność; 2023, 25, 1; art. no. 8
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An alternative material model using a generalized J2 finite-strain flow plasticity theory with isotropic hardening
    Autorzy:
    Ecsi, L.
    Elesztos, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/264832.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    teoria plastyczności
    utwardzanie izotropowe
    odkształcenia plastyczne
    nonlinear continuum theory of finite deformations of elasto-plastic media
    generalized J2 flow plasticity theory with isotropic hardening
    objective and thermodynamically consistent formulationg
    Opis:
    In this paper an alternative material model using a generalized J2 finite-strain flow plasticity theory with isotropic hardening is presented. The model is based on a new nonlinear continuum mechanical theory of finite deformations of elasto-plastic media which allows for the development of objective and thermodynamically consistent material models. As a result, the constitutive equation, the evolution equation and even the ‘normality rule’, characterising the plastic flow in the material during return mapping, can be expressed in various forms, using several instances of the yield surface and corresponding pairs of stress measures and strain rates, respectively, which are conjugate with respect to the internal mechanical power and its arbitrary higher order time derivative. Therefore the results of the material model when used in numerical analyses are not affected by the description and particularities of the material model formulation. Here, we briefly outline the nonlinear continuum theory along with a detailed description of the material model and finally present the model in a numerical example using a cross-shaped specimen in biaxial tension.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2018, 23, 2; 339-353
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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