Wind is an important environmental parameter that influences the design of floating offshore structures, particularly in harsh environment. Because wind spectrum is broadbanded, computation of wind load on the floating structure is complicated. Moreover, the wind-induced slow-drift oscillation is an important design criterion. Simulated environment in a model test often includes wind effect. Accurate modeling of wind in a laboratory environment is, however, a difficult task. The wind tunnel provides a steady load on the superstructure quite accurately, but fails to show the effect of the changing free surface as well as dynamic effect. Therefore, simultaneous simulation of wind in the wave basin is desirable. A weight representing the steady wind load with a string and pulley arrangement at the center of the application of the superstructure is inadequate since it fails to simulate the variation of the wind spectrum. The generation and control of the design wind spectrum by an overhead bank of fans facing the model superstructure is an extremely difficult task due to large windage area. This paper presents an accurate and highly controllable method of the generation of variable wind simultaneously with waves and current in the wave basin that can be used with a variety of floating structure model. The concept was originally proposed by Kvaerner Oil and Gas International and implemented by the offshore model basin (OMB). In this method, a fan equipped with a constant-speed motor and blades with an adjustable pitch angle is directly mounted on the model deck above water. A digital signal generated from the specified wind spectrum is used to run the fan much like the wavemaker. A feedback system ensures the proper generation of the wind with the model motion. The method was successfully applied in several model tests of deepwater floating structures in which broad-banded wind spectra were generated. An example from an earlier such test is given here. The importance of the effect of the simulated wind spectrum on floating structures should be clear to a design engineer from this example.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Physical modeling of wind load on a floating offshore structure


    Beteiligte:
    Bobillier, B. (Autor:in) / Chakrabarti, S. (Autor:in) / Christiansen, P. (Autor:in)


    Erscheinungsdatum :

    2001


    Format / Umfang :

    7 Seiten, 3 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




    FLOATING OFFSHORE WIND POWER STRUCTURE

    KIM BOO KI / KIM KYONG HWAN / PARK SE WAN et al. | Europäisches Patentamt | 2023

    Freier Zugriff

    Estimation of Wind Load acting on a Huge Floating Offshore Structure

    Ohmatsu, S. / Ship Research Institute | British Library Conference Proceedings | 1994


    FLOATING OFFSHORE WIND TURBINE

    YOO BYUNGMOON / KANG HOYUN / PARK JONG BEOM et al. | Europäisches Patentamt | 2023

    Freier Zugriff

    Floating offshore wind turbine

    INOUE SHUNJI | Europäisches Patentamt | 2018

    Freier Zugriff

    Floating offshore wind turbine

    INOUE SHUNJI | Europäisches Patentamt | 2022

    Freier Zugriff