散射条件下声源分离及参数获取的平行障板方法

声呐系统或水声设备湿端不可避免存在某些散射体,克服散射体干扰对声源本身辐射特性进行测量目前还缺乏简捷有效的方法。依据刚性圆盘散射规律,通过有限元建模分析了与观察方向平行布设的刚性圆盘对声源辐射特性的影响规律,结果表明:在满足远场条件时,在较小的允许误差范围内观察轴线上声压幅值分布与引入平行障板无关。并在此基础上尝试提出一种简捷有效的平行障板方法,实现散射条件下声源分离与参数获取。通过有限元仿真分析,在1kHz^20kHz频率范围内,半径0.4m、厚8mm的钢板对脉动圆管声源级分离测量引入误差在±0.6dB以内。

Parallel-baffle method for separateness and parameters acquisition of a sound source under scatting condition

In underwater part of sonar system and sound device some scatting objects exist ineluctability,it is empty of a simple and efficient method for measurement radiation parameters of a sound source without disturbance form scatting objects. Based on the sound scatting theory of rigid disk, have been analyzed the effect of a parallel baffle to observed direction on radiation parameters of a sound source. The results are shown that: On the far-field condition, pressure amplitude distribution in observed direction is independent of the parallel baffle with a smaller admissible error. On that basis, we have attempted to develop a simple and efficient parallel-baffle method to separateness and parameters acquisition of a sound source under scatting condition. Radiation performances of a pulsating tube transducer and with a parallel baffle are comparatively simulation analyzed by Finite Element Method with ANSYS software, which gives the results that the calculated error of source level of the pulsating tube transducer by using a parallel baffle (steel plant with thickness of 8mm and radius of 0.4m) in a frequency range from 1 to 20 kHz was not exceed ±0.6dB.