应用近场声强预测振动能量分布

Applied Nearfield Sound intensity Measurement to Find the Distribution of Vibration Energy

该文通过对两活塞振动模型的声强分析和研究，认识到当两活塞的振动相位差是变量时，对于活塞Ａ发射的声强进行过场检测时几乎不受活塞Ｂ所发射的声强的影响；当振动相位差是常量时，高阶振动时２个相邻被检测单元的距离通常是大于振动波长的二分之一，故某一检测单元的近场声强测量亦几乎不受其它相邻单元声强的影响。理论分析确定了近场声强和振动能量分布成正比的关系。实验证明了此结论正确。

he study of sound intensity in the model of two neighboring sources expresses that when ψ is variable the measurement of nearfield sound intensity produced by piston A is scarcely interfered by the sound intensity of piston; when ψ is constant, the measurement of nearfield sound intensity of a testing cell is hardly interfered by the sound intensity of nearby cell because the distance between the two nearby cells is usually larger than the half value of vibration wavelength. Theory analysis shows the existence of proportion relationship between nearfield sound intensity and vibration energy distribution. An experiment was carried out to give a verification.