结构声强测量方法及其误差分析

Measurement of Structure Borne Sound Intensity and Errors Analysis

在忽略近场波的情况下，推导了结构弯曲振动时在某一方向的结构声强的近似表达式，由此提出了测量结构声强的两点线性加速度传感器方法。随后对测量过程中出现的主要误差，如有限差分误差、近场误差、通道失配误差等进行了分析，并提出了减少误差的相应措施。

Neglecting near field waves,an approximate expression of structure borne sound intensity in one direction is deduced when the structures vibrate flexurally.A method to measure the intensity with two accelerometers is suggested based on theoretical analysis.The main errors produced in the measurement are analyzed and some measures for reducing the errors are proposed.