基于圆环阵列的声场仿真及校准实验

针对圆环阵列中声波多途效应难以消除的问题,提出了采用不等间距圆环阵列的方法破坏声波各径的相干性来降低旁瓣性能,减少边缘衍射反射的干扰。通过仿真验证不等间距圆环阵列能够有效降低聚焦波束旁瓣,并根据仿真结果设计最佳环形阵列结构。最后,在实验水池中对圆环阵列进行声场校准实验,分别利用脉冲波与连续波在4～8kHz频率下激励换能器阵列工作,结果表明采用脉冲正弦信号激励的方法可在有限空间内准确测量换能器的轴向声压的特性。

Sound Field Simulation and Calibration Experiment based on Circular Array

In view of the problem of acoustic multipath effect in circular array, a method of using the ring array with unequal spacing to destroy the coherence of each path is proposed to reduce the sidelobe performance and the interference of edge diffraction reflection. The simulation results show that the unequal spacing ring array can effectively reduce the side lobe of focused beam, and the optimal ring array structure is designed according to the simulation results. Finally, the acoustic field calibration experiment of the ring array is carried out in the experimental pool, the transducer array is excited by the pulse wave and the continuous wave at the frequency of 4~8kHz respectively. The results show that the axial sound pressure characteristics of the transducer can be accurately measured in the limited space by the method of pulse sinusoidal signal excitation.