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Operational modal analysis of a ship hull using waves and engine orders as excitation
Rocca, G.; Peeters, B.; Lau, J.; Ota, R. (2011). Operational modal analysis of a ship hull using waves and engine orders as excitation, in: Law, S.S. et al. (Ed.) Dynamics for sustainable engineering, vol. 2. pp. 901-910
In: Law, S.S. et al. (Ed.) (2011). Dynamics for sustainable engineering, vol. 2. Hong Kong Polytechnic Univ: China. ISBN 978-962-367-732-5. , more

Available in  Authors 
Document type: Conference paper

Keyword
    Marine
Author keywords
    Operational Modal Analysis; Ship Vibration; Engine Orders

Authors  Top 
  • Rocca, G.
  • Peeters, B.
  • Lau, J.
  • Ota, R.

Abstract
    Ship vibrations are important concerns when designing new ships. Three essential areas are often included in the building specifications for defining vibration limits: the effect of vibration on human beings, structural vibrations, and vibrations of engines and equipment items. Despite considerable progress in the theoretical and experimental treatment of ship vibrations, the ship building sector is calling for an improved accuracy of vibration prediction methods as well as for solving vibration problems on completed ships. The aim of the paper is to demonstrate the use of Operational Modal Analysis for extracting global vibration information of a ship hull that was measured in operational conditions. The paper is organized as follows: after a discussion on the background of ship hull vibration measurements in which reference is made to building specifications and standards for assessment of ship vibrations, a case study is introduced. It concerns the BOSEI MARU research and training vessel of Tokai University. Tokai University and LMS Japan were performing extensive vibration measurements in various conditions: engine run-up, anchor drop test, and wave induced vibrations. After a review of the experimental data, the results of an Operational Modal Analysis will be presented. The results of the various test conditions showed good agreement and a trustworthy set of natural frequencies, damping ratio and mode shapes could be experimentally identified, including some higher order modes of the hull and deckhouse.

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