空气中圆形平面发射器参量源声场计算与模拟

基于空气介质的非线性性质,改进伯克泰线源端射阵计算模型得到正轴声场解的局限,提出一个圆形平面发射器参量源辐射声场数学模型,以参量点声源的距离和再现声场点的距离的关系作为分割点,对参量点声源到再现声场点的距离作不同的夫琅和费近似,在计算差频波再现声场的同时获得正轴和偏轴方位的声响应.将数值计算模拟结果和实验结果比较,该模型能够更准确地表现二次再现差频波声场的分布状况.

Calculation and simulation of acoustic parametric source radiation field generated by a circular piston radiator in air

A mathematics model is presented to describe the parametric acoustic field generated by a circular piston radiator based on the nonlinear effect of air. The model overcomes the limitation of the calculative model of Berktay end fire line array that can only provide an acoustic field solution on orthoaxis. According to comparisons between parametric point source distance and secondary acoustic field point distance, different Fraunhofer approximation of the distances from parametric point to secondary acoustic field point are used to calculate separately. The responses of on-axis and off-axis both was considered while reproducing secondary acoustic wave equation was deduced. The numerical simulation results were compared with experimental results. The improved acoustic field model can express distribution of the secondary acoustic field more accurately.