基于阻尼辨识的双层厚壁结构声振环境预示研究

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Abstract The main cabins of the hypersonic vehicle are double-layered thick-walled structures, in order to meet the requirement of the heatproof and load bearing. The acoustic-vibration environment prediction of the double-layered thick-walled structure is investigated, in order to obtain the precise acoustic-vibration environment of the cabin. A method of identifying the damping loss factor is proposed based on the vibro-acoustic experiments, and the process of acoustic-vibration environment predication is given in this paper. The acoustic-vibration coupling environment a hypersonic vehicle cabin, which is double-layered thick-walled, is studied using statistical energy analysis method. The vibro-acoustic experiment is carried out, and the damping loss factor is identified based on the experimental data. The result shows that the prediction of the acoustic-vibration environment corresponds well with the experiment. The method of structural damping loss factor identification and acoustic-vibration prediction of the thick wall structure has an important significance on precise prediction of the hypersonic vehicles, and can be widely used in the area of aviation, aerospace, ship, and automobile industry.

Key words： damping identification double-layered thick-walled structure acoustic-vibration environment environment prediction

Received: 25 May 2016 Published: 28 October 2017

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2017/V36/I21/225

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