摘要
主要研究在无理想吸声末端或吸声末端吸声性能差的情况下,如何准确地进行隔声量的计算。针对三种基于波场分解法的隔声量计算方法进行对比研究,通过声学有限元仿真研究吸声末端的吸声系数对3种方法求解阻抗管隔声量精度的影响。在非理想吸声末端的情况下,采用考虑声波多次反射的波场分解法,计算隔声试件的隔声量,分析并讨论在不同吸声末端组合下对隔声试件的隔声量及前后表面反射系数计算结果影响。研究发现,考虑声波多次反射的波场分解法不受吸声末端的吸声系数的影响,可以在任意两组不同吸声末端组合下均能对隔声量进行准确的求解。此外,除隔声量外,还可以获得隔声试件后表面的反射系数。
The present paper is mainly concerned with how to calculate the sound insulation accurately for the impedance tubes without ideal absorption terminals or with the terminals of poor absorption performance.A comparison of three different methods based on the wave decomposition theory is conducted,and the effect of the absorption coefficient of terminals on the calculation accuracy of the three different methods is studied by acoustic finite element analysis.In the case without ideal terminals,the wave decomposition method considering multiple wave reflection is employed to calculate the sound insulation.The influences of absorption coefficient of terminals on the sound insulation and the reflection coefficients of the front end and rear end of the insulation specimens are discussed.The results demonstrate that the absorption coefficient of terminals has no influence on the wave decomposition method considering the multiple wave reflection.This method can calculate the sound insulation of the specimens with two arbitrarily combined different absorbent terminals accurately.In addition to the sound insulation,the reflection coefficients of back face of the specimen can also be obtained by using this method.
作者
王明杰
张卫红
陈雅曦
刘时秀
齐江龙
呙道军
WANG Mingjie;ZHANG Weihong;CHEN Yaxi;LIU Shixiu;QI Jianglong;GUO Daojun(Beijing Institute of Structure and Environment Engineering,Beijing 100076,China)
出处
《噪声与振动控制》
CSCD
2020年第3期260-264,共5页
Noise and Vibration Control
关键词
声学
波场分解法
声波多次反射
隔声量
吸声末端
吸声系数
acoustics
wave decomposition method
multiple wave reflection
sound insulation
absorbent terminal
absorption coefficient
