隔声量的阻抗管法和混响室法仿真计算对比

Comparison of Sound Absorption Coefficients of Simulating Calculations Based on Impedance Tube Method and Reverberation Chamber Method

为确保隔声构件的隔声量仿真计算准确性,以Virtual.Lab Acoustic为平台分别基于四传声器的阻抗管法和混响室法建立隔声量计算的声-振耦合模型,分析两种隔声量计算模型在入射声源、计算频率范围等方面的差异性。将试件的解析值与阻抗管法的仿真结果进行对比,验证了自编基于四传声器法传递损失计算程序的准确性。将不同边界条件下的隔声量计算结果与文献中测试值进行比较,结果表明试件边界约束越强,低频段隔声量越大,建议进行隔声量仿真时采用自由边界条件,则计算得到的隔声量曲线较为平缓,无明显震荡现象且呈现质量控制区特性,在全频段与测试值较为接近。

In order to guarantee the accuracy of simulation calculation of sound insulation of materials,based on the impedance tube method of four microphones and reverberation chamber method,the acoustic-vibration coupling model for sound insulation calculation was established respectively on the platform of LMS Virtual.Lab Acoustic.The differences between the two calculation models in the aspects of incident sound source and calculation frequency range were analyzed.By comparing the analytical value of the test piece with the simulation result of the impedance tube method,the accuracy of the program for calculating the transmission loss of the four-microphone method was verified.The results of sound insulation under different boundary conditions were compared with the test values in the literatures,which shows that the stronger the boundary constraint of the test piece,the greater the sound insulation in the low-frequency.It is recommended to use the free boundary condition in the simulation of the sound insulation.The calculated sound insulation curve is relatively gentle without obvious fluctuation and has the characteristics of mass-control area,which is close to the test value in the whole frequency band.