WB法在多域声学分析中的应用

WAVE BASED METHOD FOR MULTI-DOMAIN ACOUSTIC ANALYSIS

描述了振动声系统建模技术的基本概念.根据域分解的连续性条件,讨论了界面的压力和速度连续以及阻抗连续,应用加权余量法推导了两者的耦合模型.并用LMS/SYSNOISERev5.5进行了有限元数值模拟,计算结果与有限元结果符合得较好.通过比较两种连续性条件,发现前者更适合较小的计算模型而后者更适合较大的计算模型.最后对域分解提出了几个简单优化原则.

The basic concept of the technique modeling the vibm-acoustic system was described. According to the domain decomposition continuity conditions, this paper discussed pressure and velocity continuity and impedance continuity at the interface, and their corresponding coupled models were derived by using weighted residual formulation. And numerical analysis was carried out using finite element method by the software of LMS/SYSNOISE Rev 5.5. The results were in good agreement with FEM＇s results. Comparing both of the continuity conditions, the pressure and velocity coupling is more accurate for small models, while the latter one performs better for large models. Moreover, several simple optimal principles of domain decomposition were provided.