A test case was defined to evaluate the capability of different global optimization algorithms to find the global minimum of a ship design problem. The goal is to minimize the vertical motion of the center of gravity (heave motion) of a S175 containership advancing at a speed of 16 knots in head seas for non-dimensional frequencies omega/sqrt(L.g) > 0.4 (omega = circular frequency of incident wave, L = ship length, g = 9.81 m/s2). Five different algorithms were tested: 1) Conjugate Gradient Method (a local search algorithm), 2) Simplex Method, 3) Parameter Space Investigation (PSI, provides the Pareto Optimal Set of a multi-criteria optimization problem sampling the feasible design region by means of an unformly distributed sequence of trial solutions), 4. Particle Swarm Optimization (PSO, an evolutionary technique where a population of trial solutions (represented by a swarm of particles) is used to sample the design space, each particle moving with an adaptable speed according to individual and collective rules), 5) Lipschitzian Optimization method (Diagonal Rectangular Analysis for Global Optimization (DRAGO)). The local gradient-based method remains trapped in the neighborhood of the original configuration, and the improvement obtained was less than 10%. However, all global optimization methods improved the objective function by more than 30% - even the simplex method, which is usually treated as a local method, but can overcome problems connected with high-frequency noise of the objective function if the investigation region is wide enough. Particle Swarm Optimization seems to give the best results among the investigated algorithms.


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    Titel :

    Global optimization algorithms in naval hydrodynamics


    Weitere Titelangaben:

    Globale Optimierungsalgorithmen für den Schiffsentwurf


    Beteiligte:
    Pinto, Antonio (Autor:in) / Peri, Daniele (Autor:in) / Campana, Emilio F. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2004


    Format / Umfang :

    11 Seiten, 7 Bilder, 1 Tabelle, 16 Quellen



    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




    Global Optimization Algorithms in Naval Hydrodynamics

    Pinto, Antonio / Peri, Daniele / Campana, Emilio F. et al. | Taylor & Francis Verlag | 2004


    Global Optimization Algorithms in Naval Hydrodynamics

    Pinto, Antonio | Online Contents | 2004


    Naval hydrodynamics

    British Library Conference Proceedings | 2004


    Naval hydrodynamics

    United States; Office of Naval Research | British Library Conference Proceedings | 1997


    Naval hydrodynamics

    United States; Office of Naval Research | British Library Conference Proceedings | 1997