As a part of the Norwegian Deepwater Program (NDP) three drilling risers have been instrumented with accelerometers and rotation-rate meters for measurement of vortex-induced vibrations (VIV). In addition, current was measured at number of depths. The paper describes how the riser displacements were derived from the measurements and compared with the current. A major task has been to rid the acceleration measurements of the influence of gravity due to the riser's rotations out of the vertical and include the measurements of angular motion in a consistent way. This has been done using modal decomposition and a least-squares method to estimate the modal weights. The main purpose of the work was to provide data for calibration of computer programs for prediction of VIV. Examples of results are given.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Norwegian Deepwater Program: analysis of vortex-induced vibrations of marine risers based on full-scale measurements


    Contributors:
    Kaasen, K.E. (author) / Lie, H. (author) / Solaas, F. (author) / Vandiver, J.K. (author)


    Publication date :

    2000


    Size :

    11 Seiten, 10 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Norwegian Deepwater Program: damping of vortex-induced vibrations

    Vikestad, K. / Larsen, C.M. / Vandiver, J.K. | Tema Archive | 2000



    Vortex-Induced Vibration of Deepwater Risers

    Alien, D. W. | British Library Conference Proceedings | 1998



    Vortex induced loads on marine risers

    Wanderley, Juan B. / Levi, C. | Tema Archive | 2005