The trend towards deepwater development requires a new approach of underwater installation of offshore structures. The present method using crane vessels has some drawbacks in the operations more than 2000m because the natural period of the coupled system of the rigged structure and crane vessel becomes longer so that the manipulation of the crane to achieve the desired positioning accuracy becomes more difficult. This paper examines application of active control technique to underwater installation as a challenging solution to the present problems. The active control technique also has the advantage that it can deal with the structural flexibility which allows the structure to be large and light weight. The structural flexibility imposes problems of suppressing elastic responses and securing stability of control system. In this paper, H(infinity) controller combined with feedforward and LAC/HAC (Low Authority Control / High Authority Control) feedback controler to improve transient response of controlled modes is designed to improve steady-state response and to achieve robustness specifications. In order to confirm the control algorithm and verify the possibility of automatic installation method, basin tests are executed using two types of neutrally buoyant flexible models with ultrasound ranging system and thrusters.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Automatic installation of flexible underwater structures using active control


    Weitere Titelangaben:

    Automatische Installation flexibler Unterwasserstrukturen mit Einsatz aktiver Regelung


    Beteiligte:
    Watanabe, K. (Autor:in) / Suzuki, H. (Autor:in) / Yoshida, K. (Autor:in)


    Erscheinungsdatum :

    1997


    Format / Umfang :

    8 Seiten, 12 Bilder, 9 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch





    FRAME AND INSTALLATION METHOD FOR SAFETY DIAGNOSIS OF UNDERWATER STRUCTURES

    WON HO | Europäisches Patentamt | 2020

    Freier Zugriff

    FLEXIBLE PASSENGER SECURITY CONTROL INSTALLATION

    SAFIR ANDRÉ | Europäisches Patentamt | 2019

    Freier Zugriff

    Flexible passenger security control installation

    SAFIR ANDRÉ | Europäisches Patentamt | 2019

    Freier Zugriff

    Flexible passenger security control installation

    SAFIR ANDRÉ | Europäisches Patentamt | 2022

    Freier Zugriff