运动声源简正波模型稳相点的射线多普勒近似算法

Ray Doppler approximation on the stationary phase point of normal mode model about acoustic field generated by moving point source

从航空声源水下声场建模出发,提出了运动声源稳相点的近似算法。由于Hawker给出的运动声源声场简正波模型计算方法不适用于高速运动声源,针对速度相对较大的低空运动声源辐射噪声激发的水下声场建模,采用虚源概念,基于射线声学理论得到近似多普勒频率,结合简正波理论求解稳相点,较好地解决了高速运动声源声场的解算问题。几种波导环境下两种方法数值计算比较结果表明该算法的有效性。

The well-known method of computing the acoustic field generated by a moving source obtained by Hawker no longer applies if the source velocity is not small enough. An approach is presented to find the stationary phase point of the normal mode model in order to solve the problem of modeling underwater acoustics field excited by the aircraft. The method bases on Doppler frequency of virtual source determined by ray acoustics theory, and combined with normal mode theory. More accurate stationary phase point than Hawker's solution is found. Numerical results are presented to illustrate the validity of the presented algorithm.