摘要
本文探讨了在驻波管中采用吸声末端的小试样垂直入射隔声量测试方法 ,提出了驻波分离法 ,与直接比较法的测试结果进行了比较 ;并根据实验探讨了吸声末端的吸声性能对隔声量测试的影响。实验结果指明 ,吸声末端的吸声系数大于 0 .99时可使隔声量测试误差小于± 1dB。驻波分离法可提高测试精度 。
The measuring method for normal incidence transmission loss of sound using absorbent ending which can be applied to small specimens were investigated in this paper.The method of standing wave separation was advanced,and compared with the direct comparing method.The influence of the properties of the absorbent ending on the test results were discussed.According to the test results,the test errors will be smaller than ±1dB if the absorption coefficient of the ending is larger than 0.99.It is possible to raise the test precision and reduce the working time using the method of standing wave separation.
出处
《噪声与振动控制》
CSCD
2000年第6期41-43,共3页
Noise and Vibration Control
关键词
驻波分离法
吸声末端
驻波管
隔声量测试
sound transmission loss
standing wave separation
absorbent ending
standing wave tuH
