Design and Optimization of Active Echo Control Array Layout

doi:10.12382/bgxb.2023.1165

Abstract

Abstract:

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 300-2000Hz 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.

Key words: active echo control, active emission unit, array layout optimization, phased array, sound field consistency, wide low-frequency broadband

CLC Number:

TB56

YANG Long, WANG Wenjie, LI Haojun, XIANG Yue, ZHAO Xu. Design and Optimization of Active Echo Control Array Layout[J]. Acta Armamentarii, 2025, 46(1): 231165-.

Figures/Tables 17

Fig.1 Structure diagram of activeemission unit[24]

Fig.2 Schematic diagram of time-domain signal separation technology

Fig.3 Feedforward phased array system based on Fx-LMS algorithm

Fig.4 Acoustic finite element mesh model

Fig.5 Monitoring point setting

Fig.6 Environment and simulation environments

Fig.7 Test array comparison

Fig.8 Comparison of numerically simulated and experimental results

Fig.9 Disk array layout

Fig.10 Sound field formation at different frequencies

Fig.11 Comparison of sound field consistencies of disk emission arrays

Fig.12 Cloud image of sound field formed by each array at 300Hz

Fig.13 Square disk array layout

Fig.14 Performance comparisonof square disk array and disk array

Fig.15 Comparison of sound field consistencies of square disk emission arrays

Fig.16 Cloud image of sound field of each disk array

Fig.17 Sound field cloud images of Array 3F at various distances

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