Bulk-reacting sound absorbing materials are often used in packed silencers to reduce broadband noise. A bulk-reacting material is characterized by a complex mean density and a complex speed of sound. Recently, a so-called direct mixed-body boundary element method has been developed to model a packed silencer in a user-friendly and single-domain BEM approach. However, due to the complexity of the integral equations, the BEM spends a lot of time in doing numerical integration. In this study, a vector and multithread BEM algorithm is implemented on a multi-processor PC workstation running Windows NT/2000. Evaluation of the fundamental solutions and their derivatives is vectorized before numerical integration loop begins. Both the matrix generation part and the matrix solution part are parallelized. A parallel efficiency of around 0.90 can be achieved on a dual-processor PC workstation. A parallel-baffle silencer is used as an example to demonstrate the vector/multithread computation. The BEM solution for the transmission loss (TL) is compared to experimental TL measurements.
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机译：散装反应吸音材料通常用于包装的消音器中，以减少宽带噪声。体积反应材料的特征在于复杂的平均密度和复杂的声速。最近，已经开发了一种所谓的直接混合体边界元素方法，以在用户友好和单域BEM方法中模拟包装的消音器。然而，由于积分方程的复杂性，BEM在做数值集成时花费很多时间。在本研究中，在运行Windows NT / 2000的多处理器PC工作站上实现了向量和多线程BEM算法。在数值集成循环开始之前，对基本解决方案及其衍生物的评估是矢量化的。矩阵生成部分和矩阵溶液部分都是平行化的。在双处理器PC工作站上可以实现平行效率约为0.90。使用平行挡板消音器作为示例以展示矢量/多线程计算。将传输损耗（TL）的BEM解决方案与实验T1测量进行比较。
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