4aSA1. Component mode synthesis method for a large-scale coupled structure--acoustic fluid interaction problem.

Session: Thursday Morning, December 5

Time: 9:05

Author: Tetsuji Ichikawa
Location: Vehicle Res. Lab., Nissan Res. Ctr., Yokosuka, Kanagawa, 237 Japan
Author: Ichiro Hagiwara
Location: Tokyo Inst. of Technol., Tokyo, 152 Japan


A component mode synthesis method capable of estimating acoustic responses efficiently in a coupled structure--acoustic fluid interaction problem is presented. In order to analyze the response in a high-frequency range, a high- and low-order truncatable mode superposition method, namely, the most general mode superposition method by Ma-Hagiwara, is incorporated in the reduction process included in both the formulation of component mode synthesis and solving the superimposed global equation of motion. By truncating lower modes, it becomes possible to analyze a system with fewer degrees of freedom than the existing modal reduction methods. Frequency response analyses of several test problems of damped structures are performed and compared with the multipurpose versatile code, MSC/NASTRAN, to demonstrate the efficiency and versatility of the proposed method.

ASA 132nd meeting - Hawaii, December 1996