Analysis or Coupled Vibration between a Hull and a Superstructure by Mode Synthesis Method

Abstract

Because of the increase of superstructure height, natural frequency of its rocking vibration have been lower to the blade frequency. Then some problem caused by fore-aft vibration of superstructure have often occurred. Therefore the natural frequency of rocking vibration must be estimated accurately in the design stage, to decrease such vibration and problems. The authors have studied to apply model analysis to such vibration. In this paper, examples on the application of mode synthesis method and its structural modification method to model ship and actual ship are described.