基于声学仿真的声学法砝码体积测量装置输入参数的确定

针对声学法砝码体积测量装置的声学腔体内扬声器驱动信号的选择影响测量准确性的问题,提出了一种驱动信号参数确定方法。利用声学有限元法对声学腔体进行建模仿真,获得使体积误差最小的扬声器的最佳驱动信号幅值和频率点,同时在不同的幅值和频率点应用声学法砝码体积测量装置进行实际体积测量验证,结果表明:使体积测量误差最小的驱动信号参数与仿真结果一致。声学腔体的最佳测量频率为46Hz,该驱动频率下体积测量值与液体静力法测得值的偏差小于0.001cm³;在一定的测量范围内,驱动信号的幅值对声学法砝码体积测量准确性无影响。

Determination of Input Parameters of Acoustic Weight Volume Measurement Device Based on Acoustic Simulation

Aiming at the problem that the selection of the loudspeaker driving signal in the acoustic cavity of the acoustic method weight volume measuring device affects the measurement accuracy, a method for determining the driving signal parameters is proposed, which is a method of using the finite element method to model a simulation of the acoustic cavity, and getting the optimal driver signal amplitude and frequency point of the loudspeaker that minimizes the volume error.At the same time, the acoustic volume measurement device is applied at different amplitudes and frequency points for actual volume measurement verification.The results show that the driving signal parameters that minimize the volume measurement error are in good agreement with the simulation results.The optimal measurement frequency of the above acoustic cavity is 46Hz, and the deviation between the volume measurement value under the driving frequency and the value measured by the hydrostatic method is less than 0.001cm³.In a certain measuring range, the amplitude of driving signal has no effect on the accuracy of the acoustic method.