现场识别多个声源原信号的研究

在噪声控制以及利用机器噪声源进行工况监测和故障诊断中,必须首先了解噪声的来源及与其相关的信息.现场测量多个声源的原信号时不可避免地存在反射声的干扰.根据几何声学的模型和广义道矩阵的原理,提出一种在多个反射面影响下利用广义逆矩阵原理消除声反射影响,并把多个声源的原信号恢复出来的方法.计算机数字模拟和声学实验结果表明:当声源原信号为单频正弦信号、倍频程信号和某些语音元音信号时,该方法对恢复多个声源原信号的波形有其优越性.

A Study on Recovering the Original Signals of Multi-acoustical Sources In-situ

Using acoustical signals for condition monitoring and fault diagnosis of machines or for noise control, the information about the noise sources should be obtained firstly. However, in an industrial environment of multiple noise sources, the signal received in-situ is the sum of the sound pressure of the direct waves and reflected waves. Thus, the problem how to eliminate the influence of reflection and recover the original signal of multi-acoustical sources, has arisen. The results of a series of acoustical experiments in the anechoic chamber, reverberant chamber and ordinary room show the method is effective if the original signal is sinusoidal, octave and some voice vowels etc.