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首页> 外文期刊>Engineering analysis with boundary elements >Boundary element analysis of packed silencers with a substructuring technique
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Boundary element analysis of packed silencers with a substructuring technique

机译：用子结构技术分析填充消音器的边界元

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摘要

It is well known that for certain large structures, substructuring can significantly reduce the matrix size and the total computational time. In this paper, a substructuring technique based on the impedance matrix synthesis is used along with the recently developed direct mixed-body boundary element method (BEM) to evaluate the transmission loss (TL) of packed silencers. Due to the single-domain nature of the direct mixed-body BEM, each substructure does not need to be a homogeneous domain. Complex internal components such as extended inlet/outlet tubes, perforated tubes, and thin baffles, as well as bulk-reacting linings, can all be in one single substructure. As such, dividing a large silencer into modular substructures can be done naturally in the longitudinal direction. This completely eliminates the traditional rule of having to construct well defined (no thin bodies) and homogeneous subdomains in the conventional multi-domain BEM. The substructuring technique presented in this paper also has the capability of modeling a catalytic converter in which a catalytic monolith containing a stack of capillary tubes is inserted between two connecting substructures. Several test cases including two parallel-baffle silencers are presented to demonstrate the technique. The BEM predictions for TL are verified by experimental data.
机译：众所周知，对于某些大型结构，子结构可以显着减少矩阵大小和总计算时间。在本文中，基于阻抗矩阵合成的子结构技术与最近开发的直接混合体边界元法（BEM）一起用于评估填充消音器的传输损耗（TL）。由于直接混合体BEM的单域性质，每个子结构都不必是同质域。复杂的内部组件（例如，扩展的入口/出口管，多孔管，薄挡板以及散装反应衬里）都可以在一个子结构中。这样，将大型消音器分成模块化子结构可以自然地在纵向上完成。这完全消除了必须在常规多域BEM中构造定义明确（无薄体）和同质子域的传统规则。本文介绍的子结构技术还具有对催化转化器进行建模的能力，其中，将包含一堆毛细管的催化整体件插入两个连接的子结构之间。提出了几个测试案例，其中包括两个平行挡板式消音器，以演示该技术。实验数据验证了TL的BEM预测。

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