双腔结构消声器声学性能计算子域耦合方法

提出基于子域划分的耦合方法求解双腔结构消声器声学性能。据结构特点或材料属性将消声器分为不同子域，用数值模态匹配法或三维解析方法求解规则等截面子域结构传递矩阵，用三维数值方法求解非规则渐变截面子域结构传递矩阵，用子域连续条件求得消声器整体矩阵，进而获得消声器传递损失。分别用基于子域划分的耦合方法、三维有限元方法及数值模态匹配法计算典型双腔结构消声器的传递损失。结果表明，基于子域划分的耦合方法适用预测双腔结构消声器声学特性，与数值模态匹配法相比计算效率较高。

Coupling method based on substructure for the acoustic attenuation performance analysis of double-chamber silencers

For the acoustic attenuation performance analysis of double-chamber silencers, the coupling method based on substructure is proposed. The basic idea is that: the silencer is divided into several substructures according to the geometry characteristics and material characteristics. Applying the 3-D analytical method or numerical mode matching method to calculate the transfer matrixes of the substructures with regular cross-section, and using the 3-D numerical method for the substructures with irregular cross-section. The integer transfer matrix of the silencer is solved by combining with the continuity conditions at the interfaces of the substructures, and the transmission loss is derived. The transmission loss of the several typical double-chamber silencers are calculated by using the proposed coupling method, the finite element method and the numerical mode matching method, respectively, and the results show that the coupling method based on the substructures is applicable for the double-chamber silencers, and more efficient than numerical mode matching method.