消声器中频声学性能数值预测与实验测量研究

Study on Numerical Prediction and Experimental Measurement of Acoustic Performance of Silencers in Medium Frequency Range

采用有限元法计算内部声场,根据管道声学模态理论分解出模态声波,进而计算出消声器的传递损失。采用相同的原理,通过多传声器声波分解法对简单膨胀腔消声器进行实验测量,实验测量结果与数值预测结果吻合较好,并将消声器传递损失的数值预测和实验测量的有效频率范围拓展到平面波截止频率以上。

The finite element method is used to calculate the internal sound field of a silencer,the mode waves are decomposed based on the acoustic mode theory,and then the transmission loss is determined.Based on the same theory,the transmission loss is measured through wave decomposition method with multi-sensors.It is found that results of the experimental measurement agree well with those of the numerical predictions.The effective frequency range for prediction and measurement of transmission loss are both extended beyond the cut-off frequency.