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    Control of fully actuated ocean vehicles under stochastic environmental loads in three dimensional space

    Access Status
    Fulltext not available
    Authors
    Do, Khac Duc
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Do, K.D. 2015. Control of fully actuated ocean vehicles under stochastic environmental loads in three dimensional space. Ocean Engineering. 99: pp. 34-43.
    Source Title
    OCEAN ENGINEERING
    DOI
    10.1016/j.oceaneng.2015.03.005
    ISSN
    0029-8018
    School
    Department of Mechanical Engineering
    URI
    http://hdl.handle.net/20.500.11937/41702
    Collection
    • Curtin Research Publications
    Abstract

    Although environmental loads induced by waves, wind, and ocean currents on ocean vehicles are naturally stochastic, all existing works on controlling these vehicles treat the loads as deterministic. This treatment deteriorates the control performance or even results in an unstable closed loop system in a practical implementation. This paper presents a method to design controllers that force a fully actuated ocean vehicle under stochastic environmental loads to track a reference trajectory in three dimensional space. The control design is based on several recent results developed for stability and control of stochastic systems, and backstepping and Lyapunov׳s direct methods. The modified Rodrigues parameters are used for the attitude representation of the vehicle to reduce singularities in comparison with the use of Euler-angles and Rodrigues parameters. Simulations on an omni-directional intelligent navigator illustrate the results.

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