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将数值模态匹配法应用于计算横截面为任意形状的直通穿孔管抗性消声器的声学特性。应用二维有限元法计算横截面的本征值和本征向量,应用模态匹配技术求解模态幅值系数,进而得到所需的声学量。对于圆形和椭圆形直通穿孔管消声器的传递损失,数值模态匹配法计算结果与三维有限元计算结果和相应的实验测量结果吻合良好,表明数值模态匹配法能够精确计算直通穿孔管消声器的声学特性。计算结果表明,穿孔管的偏移影响消声器在中高频段的消声特性,同轴结构消声器的消声性能好于非同轴结构。
The numerical mode matching method is applied to the calculation of acoustic properties of through-hole perforated tube-resistant silencers of arbitrary cross-section. The two-dimensional finite element method is used to calculate the eigenvalue and eigenvector of the cross section. Modal matching technique is used to solve the modal amplitude coefficient, and the required acoustic volume is obtained. For the transmission losses of circular and oval through-the-hole perforated pipe silencers, the results of numerical mode matching method are in good agreement with the results of three-dimensional finite element analysis and the corresponding experimental measurements, indicating that the numerical modal matching method can accurately calculate the through- Acoustics. The calculated results show that the offset of the perforated pipe affects the muffler’s muffling characteristics in mid-high frequency range. The muffler performance of the coaxial muffler is better than that of the non-coaxial structure.