消声器声学性能预测的子结构快速多极子边界元法

Substructure Fast Multipole Boundary Element Approach for Acoustic Performance Prediction of Silencers

鉴于快速多极子边界元法的应用主要局限于单区域声学问题计算,发展基于子结构技术的快速多极子边界元法以计算多区域声场问题,介绍基本原理、具体实施过程以及优缺点.以带有插进口管的膨胀腔消声器为例,应用子结构快速多极子边界元法和传统边界元法计算其传递损失,通过与实验测量结果的比较,验证方法的有效性和计算精度.研究表明,快速多极子边界元法与传统边界元法相比,节点数越多,其在节省计算时间,减少计算量等方面的优势越明显.

A substructure FMBEM approach is developed for multi-domain sound field computations. The basic approach and process as well as advantages and disadvantages are introduced. Transmission loss of expansion chamber with extended inlet tube is calculated by using substructure FMBEM and conventional boundary element method （CBEM）. Availability and accuracy of the approach are validated with experimental result. It indicates that, compared to the CBEM, substructure FMBEM reduces computational time and computational complexity obviously as the number of nodes is increased.