一种微穿孔板消声器传递损失

Transmission loss of a micro-perforated panel muffler

针对锻压装备大功率电机引起噪声,提出一种新型微穿孔板消声器结构,结合"微穿孔板吸声结构"理论和一维平面波理论,建立其传递损失的数学理论模型,并利用声学仿真软件LMS Virtual.lab对提出的消声器结构进行有限元计算;分析不同腔深对双极微穿孔板消声器传递损失的影响。结果表明:①理论计算结果和仿真分析结果能够吻合,验证了理论计算公式的准确性;②通过改变不同的腔深,可以得到不同的共振频率,并且随着腔深的增加,消声器在高频段的吸声性能有所改善。

Aim ing at the noise caused by high-power motors in forging equipment,a new micro-perforated plate muffler structure has been proposed.By combining the theory of "micro-perforated plate sound-absorbing structure" and one-dimensional plane wave theory,the mathematical theory model of transmission loss has been established.The acoustic simulation software LMS Virtual.lab has been used to perform finite element calculation on the proposed muffler structure.The influence of different cavity depths on the transmission loss of the bipolar micro-perforated muffler has been analyzed.The results show that ① the theoretical calculation results and the simulation analysis results can be consistent which can verify the accuracy of the theoretical calculation formula;② different resonant frequencies can be obtained by changing different cavity depths and the sound absorbing performance of the muffler in the high frequency band has been improved with the in crease of the cavity depth.