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《Journal of Vibration and Shock》 2015-16
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Prediction of acoustic radiation field on engine surface by domain decomposition based fastmultipole method of fundamental solution

CHEN Chang-zheng;ZHANG Shi-wei;ZHOU Bo;HUANG He-ting;School of Mechanical Engineering,Shenyang University of Technology;Architectural and Engineering Institute,Shenyang University of Technology;Xiamen XGMA Machinery Co.,Ltd;  
Due to the complex structure of engine surface and a lot of long narrow borders,standard approaches to solve the distribution of source points cannot gain enough computational precision in using the method of fundamental solution( MFS). Thus,an improved algorithm for solving the distribution of source points was presented and used to deal with long narrow borders. Combining with the fast multipole algorithm,a domain decomposition based fast mutipole method of fundamental solution( FMMFS) was proposed. The improved algorithm was used to solve the distribution of source points,while the FMMFS was used to predict the acoustic radiation field on engine surface. The results show that the optimal distance between the collocation points and source points is 34. 5 mm and the computational precision is improved. When the number of truncation terms is 15,the uncertainty in low frequency due to too few number of truncation terms can be avoided and the computational efficiency can be guaranteed. To improve the computational precision,the method uses domain decomposition to solve the distribution of source points,it differs from the fast multipole BEM which adopts mesh refinement. The experimental results are in good agreement with the computational results,which indicate that the domain decomposition based FMMFS can improve substanlially the computational precision of the prediction of acoustic radiation field on engine surface.
【Fund】: 中国博士后科学基金(2014M560220);; 国家科学支撑计划(2013BAF07B04)
【CateGory Index】: TK401
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