Abstract:

BEM-FE-SEA method simulating standing wave tube (BFS method) is proposed to get the transmission loss of acoustic material. The influence of different boundary conditions on the transmission loss are discussed. The effectiveness and accuracy of the BFS method is demonstrated by contrast with FEM standing wave tube method, FEM-SEA reverberation simulating method and RuiLi method.The results showed that BFS method can be used in the overall frequency domain with better accuracy and lower computation cost, making up for the shortcomings of the experimental means.

摘要：

提出边界元-有限元-统计能量（BEM+FEM+SEA，简称BFS）混合方法模拟驻波管，即BFS驻波管模拟法，计算材料的隔声量。探究了不同边界条件对BFS驻波管模拟法隔声量计算结果的影响；通过与有限元（FEM）驻波管模拟法、有限元-统计能量（FEM+SEA，简称FS）混响室模拟法以及瑞利-李兹理论法所得隔声量对比，验证BFS方法的有效性和精度。结果表明，BFS驻波管模拟法能够较为准确地模拟驻波管，得到待测材料的隔声量，相对于有限元（FEM）驻波管模拟法，能够有效解决震荡问题，减小计算量，提升计算速度，可适用于全频段声学材料性能的计算和评估，弥补实验手段耗时费力的缺点，尤其是在新产品的开发阶段具有一定的实际意义。

关键词: 振动与波, BFS方法, 有限元法, 驻波管, 隔声量