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《Journal of Naval University of Engineering》 2017-03
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Analysis of vibro-acoustic coupling field in enclosure under complex excitation

SU Chang-wei;ZHU Hai-chao;XIE Zhi-min;CHEN Ying;Inst. of Noise & Vibration,Naval Univ. of Engineering;National Key Laboratory on Ship Vibration & Noise,Naval Univ. of Engineering;Maritime Environment Project Office of PLA;Office of Research & Development,Naval Univ. of Engineering;  
For the vibro-acoustic coupling field under complex excitation,a new analytical method is proposed.By this method,the modal amplitude matrix of the structure is calculated by using the normal velocity distributed on a limited number of measuring points on the surface of elastic structure.Then the normal velocity field on the surface of elastic structure is reconstructed and the prediction of whole interior enclosed sound pressure field is realized.It is not necessary to obtain any information of external excitation in the analysis process,so the method is suitable for the complex excitation.In order to improve reconstruction accuracy and reduce the quantity of calculation,researches on both modal truncation and measuring points arrangement are also carried out.Furthermore,a criterion of modal truncation and an approach of optimizing the locations of measuring points are presented.Finally,apanel-cavity coupling model is analyzed numerically.The results indicate that the analytical method of vibro-acoustic coupling field is feasible,and the criterion of modal truncation and the approach of optimizing the locations of measuring points are effective.
【Fund】: 国家自然科学基金资助项目(51675529;51305452)
【CateGory Index】: O422
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