主动回波控制的阵列布局设计与优化

To address the scale contradiction problems of centimeter-level thickness and meter-level low-frequency detection wavelength of underwater vehicle covering layer,a secondary emission array of giant magnetostrictive transducer is developed and the surface configuration of emission unit is optimized. The active echo control effect of large underwater samples is simulated and evaluated based on the active echo control method of phased array. The sound pressure levels and cloud maps of three positions in the spatial sound field are verified by comparing the numerically simulated results of acoustic finite element model with the test data in a large pressure silencing tank,and the sound field consistency of six frequency points in the low band range of 300-2 000 Hz with different array layouts is studied. The results show that the higher the frequency is,the worse the consistency of planar sound field is. The consistency of planar sound field formed by the array with square disk is better than that of the disk array. The optimal array layout can form a better planar sound field at 10 m away from it,and the optimal configuration of the emission unit can further improve the consistency of sound field under the active echo control,so as to achieve better control effect.