线阵声强缩放方法在水下声源辐射功率估算中的应用

为了解决水下声源辐射声功率难以计算的问题,利用线阵声强缩放方法在波束形成声源识别的基础上,根据波束输出结果与声源辐射声功率之间的换算关系来获得相应的声功率。为了提高线阵声强缩放方法的水下声功率估算精度,给出了一定动态范围限制的主瓣区域积分方法,并通过仿真验证了该方法的有效性。在消声水池中开展了水下声功率估算的实验研究。在不同的测试距离下,对双声源条件下的单频以及宽带声源在阵列侧的辐射声功率进行了估算,以混响法的测量结果为参考值,研究了估算误差随声源频率、测试距离等影响因素的变化规律。实验结果表明,无论是单频还是宽带声源,声功率的最大估算误差不超过2.6 dB,在高频时不超过1.6 dB。验证了线阵声强缩放方法应用于水下声源辐射声功率估算的正确性与可行性。 

The application of linear array sound intensity scaling method in underwater sound source radiated power estimation

The radiated power of underwater sound sources is difficult to obtain.In the view of this problem,by using line array sound intensity scaling method,the corresponding sound power is obtained according to the conversion relation between the beamforming output and the radiated sound power of the sound source based on the source recognition via beamforming.In order to improve the estimation accuracy of underwater sound power by linear array sound intensity scaling method,a main lobe region integration method with a certain dynamic range limitation was proposed and verified by numerical simulation.The underwater sound power estimation experiment was implemented in an anechoic water pool.The radiated sound power of single-frequency and broadband sound sources was estimated at different measuring distances for dual underwater sources.The measurement results of reverberation method were taken as the reference value of radiated sound power.The variation of the estimation error with the influence factors,such as the frequency of the sound source and the measuring distance was studied.The experimental results show that the maximum estimation error of both single-frequency and broadband sound sources does not exceed 2.6 dB and does not exceed 1.6 dB at high frequencies,which indicated the correctness and feasibility of the linear array sound intensity scaling method for estimating the radiated sound power of underwater sound sources.