常压下基于频率响应测量声速的改进方法

摘要

Based on the characteristics of frequency responses at different positions , a new method of sound velocity measurement in a sound tube is suggested to get more stable sound velocity .Two hydrophones with moderate dis-tance are adopted for measuring sensors , and it does not need to change the position of the water surface and the sensor position .The operation of the experiment is simple , and the data processing is easy .The fluctuation of fre-quency differences is small .It can be used in the condition that pressure exists .The influence of the reflection coef-ficient of the transmitting transducer on the bottom of the sound tube is eliminated .As a result , more accurate sound velocity is obtained .Simulation results demonstrate the periodicity of the function and the stability of the frequency differences.The accuracy and reliability of this method are proved by the experiment's results.The local sound ve-locity can be measured correctly with the frequency response .This method offers an accurate reference for the sound tube measurement system .The precision of the measurement can be ensured .%为了得到更稳定的声速，提出了一种根据声管中不同位置处声压的频率响应特点测量声速的新方法。本方法选取2个距离适中的水听器为测量传感器，不需要改变水面位置和传感器位置，操作简单、数据处理方便、测量误差很小。可以应用于有压力的工况。消除了位于声管底部声源发射换能器处反射系数对声速测量的影响。仿真结果说明了函数的周期性以及频差的稳定性。通过实验测量，验证了方法的正确和可靠。根据频率响应精确测量水声声管中的声速，为声管测量系统提供准确的参考，保证了测量精度。