The Recovery of Underwater Target's Free Field Acoustic Radiation Characteristics and Identification of Far-field AcousticRadiation Hotspot

doi:10.3969/j.issn.1000-1093.2020.01.014

Abstract

Abstract: Acquiring the acoustic characteristics of target in water is very important for the identification and analysis of a target. A field separation technique combined sound field recovery technology based on boundary element method with surface contribution method is proposed to achieve the free field conditions for testing the sound characteristics of target in water and eliminate the interference of the energy flow at the surface of structure to the identification of hotspot in the far-field acoustic radiation. The proposed method can be used to obtain the free field acoustic characteristics of the underwater target in the non-free and near field environment and identify hotspot in far field in water. The simulated results show that there are no significant differences among the sound pressure and sound power obtained by the sound field recovery technology and those in the free field. The surface contribution method is used to filter out the energy flow circulating on the surface of vibrating structure, so far-field acoustic radiation hotspot can be identified in near field. The proposed method breaks through the limitations of test environment, significantly reduces the testing costs and has certain engineering application value. Key

Key words: underwatertarget, acousticradiationcharacteristic, freefield, hotspotinfarfield, freefieldrecoverytechnology, surfacecontributionmethod

CLC Number:

TB566

LIN Wei, XIA Maolong, LIU Zhenghao, LI Sheng, MENG Chunxia. The Recovery of Underwater Target's Free Field Acoustic Radiation Characteristics and Identification of Far-field AcousticRadiation Hotspot[J]. Acta Armamentarii, 2020, 41(1): 119-126.

References

［1］王志伟, 刘文帅.舰船声隐身测试与目标声特性获取关联关系分析[C]∥中国造船工程学会船舶力学学术委员会水下噪声学组成立三十周年船舶水下噪声学术讨论会. 郑州:中国造船工程学会, 2015.
WANG Z W，LIU W S. Analysis of correlation between ship's acoustic stealth test and target acoustic characteristics acquisition[C]∥Proceedings of the 30th Anniversary of Underwater Noise Group of Ship Mechanics Academic Committee of CSNAME and the 15th Ship Underwater Noise Academic Seminar. Zhengzhou: Chinese Society of Naval Architecture and Marine Engineers，2015.（in Chinese）
[2］高霄鹏. 舰艇水动力噪声的数值分析与拖曳模测试技术研究[D].上海：上海交通大学, 2007.
GAO X P. The study on numerical analysis of fluid noise and acoustic test with towed model[D].Shanghai：Shanghai Jiao Tong University,2007.（in Chinese）
[3] 姜可宇，姚直象，尹敬湘.一种基于三元阵的水下目标被动定位方法[J]. 兵工学报, 2012, 33(9):1107-1111.
JIANG K Y, YAO Z X, YIN J X. A passive locating method for underwater target based on three-element-array[J]. Acta Armamentarii, 2012, 33(9):1107-1111.（in Chinese）
[4］刘程鹏. 结构声辐射的倏逝波滤波技术及应用研究[D]. 大连：大连理工大学, 2018.
LIU C P. Evanescent wave filtering technology and application in structural acoustic radiation[D].Dalian: Dalian University of Technology，2018. （in Chinese）
[5］ STEPANISHEN P R, BENJAMIN K C.Forward and backward projection of acoustic fields using FFT methods[J].Journal of the Acoustical Society of America, 1998, 71(4):803-812.
[6］ MAYNARD J D, WILLIAMS E G, LEE Y. Nearfield acoustic holography: I. theory of generalized holography and the development of NAH[J]. Journal of the Acoustical Society of America, 1985, 78(4):1395-1413.
[7］ VERONESI W A, MAYNARD J D. Nearfield acoustic holography(NAH) II holographic reconstruction algorithms and computer implementation[J]. Journal of the Acoustical Society of America, 1987, 81(5):1307-1322.
[8］ WILLIAMS E G, DARDY H D, WASHBURN K B. Generalized nearfield acoustical holography for cylindrical geometry: theory and experiment[J].Journal of the Acoustical Society of America,1987, 81(2):389-407.
[9］ WILLIAMS E G.Fourier acoustics[M]. Cambridge，MA，US：Academic Press，1999.

[10］陈心昭, 毕传兴. 近场声全息技术及其应用[M].北京：科学出版社, 2013.
CHEN X Z, BI C X.Near-field acoustic holography and its application[M].Beijing：Science Press, 2013.（in Chinese）
[11］ WILLIAMS E G, MAYNARD J D, SKUDRZYK E.Sound source reconstructions using a microphone array[J].Journal of the Acoustical Society of America,1980, 68(1):340-344.
[12］ BI C X, BOLTON J S. An equivalent source technique for reco-vering the free sound field in a noisy environment[J]. Journal of the Acoustical Society of America, 2012, 131(2):1260.
[13］田湘林, 楼京俊.基于等效源法的单全息面分离声场研究[J]. 噪声与振动控制, 2018, 38(4):23-26.
TIAN X L,LOU J J.Study on sound field of single holographic surface separation based on equivalent source method[J]. Noise and Vibration Control, 2018, 38(4):23-26.（in Chinese）
[14］王晓冬. 单全息面的直接声场分离方法探究[J].科技经济导刊, 2018, 26(13):27.
WANG X D. Research on direct sound field separation method of single holographic surface[J]. Technology and Economic Guide, 2018, 26(13):27.(in Chinese)
[15] 周思同, 何琳, 帅长庚, 等. 基于简正波和波叠加法的水下非自由声场重建技术仿真研究[J]. 兵工学报, 2018, 39(2): 338-344.
ZHOU S T, HE L, SHUAI C G, et al. Simulation research on underwater non-free sound field reconstruction based on normal mode and wave superposition[J]. Acta Armamentarii, 2018, 39(2): 338-344. (in Chinese)
[16］ BOBROVNITSKII Y I, MAL′TSEV K I, OSTAPISHIN N M, et al. Acoustical model of a machine[J]. Soviet Physics Acoustics, 1991, 37(6):570-574.
[17］ LANGRENNE C，MELON M，GARCIA A.Boundary element method for the acoustic characterization of a machine in bounded noisy environment[J]. Journal of the Acoustical Society of America，2007，121(5 Pt1):2750-2757.
[18］林伟, 夏茂龙, 孟春霞, 等.水下圆柱壳自由场声辐射特性的获取[J].中国舰船研究,2019,14(2):83-90.
LIN W, XIA M L, MENG C X, et al. The acquisition of free-field acoustic radiation characteristics of underwater cylindrical[J].Ship Science and Technology, 2019,14(2):83-90.（in Chinese）
[19］刘正浩, 郑毅, 黎胜. 基于表面贡献法的船壳远场声辐射热区识别[J]. 舰船科学技术, 2017, 39(7):34-38.
LIU Z H, ZHENG Y, LI S. Identification of hull's radiation hotspot to far-field based on surface contribution method[J].Ship Science and Technology, 2017, 39(7):34-38.（in Chinese）
[20］ WILLIAMS E G. Supersonic acoustic intensity on planar sources[J]. Journal of the Acoustical Society of America, 1998, 104(5): 2845-2850.
[21］ WILLIAMS E G. Supersonic acoustic intensity[J]. Journal of the Acoustical Society of America,1995, 97(1):121-127.
[22］ JUNIOR C A C,TENENBAUM R A.Useful intensity:a technique to identify radiating regions on arbitrarily shaped surfaces[J].Journal of Sound & Vibration, 2013, 332(6):1567-1584.
[23］ MARBURG S, LSCHE E, PETERS H, et al. Surface contributions to radiated sound power[J]. Journal of the Acoustical Society of America, 2013, 133(6):3700-3705.
[24］ BARNARD A R, HAMBRIC S A, MAYNARD J D.Underwater measurement of narrowband sound power and directivity using supersonic intensity in reverberant environments[J].Journal of Sound & Vibration, 2012, 331(17):3931-3944.
[25］ WU T W, OCHMANN M. Boundary element acoustics: fundamentals and computer codes[J].Journal of the Acoustical Society of America, 2002, 111(4):1507-1508.
[26］ SEYBERT A F，SOENARKO B，RIZZO F J，et al.An advanced computational method for radiation and scattering of acoustic waves in three dimensions[J]. Journal of the Acoustical Society of America，1985，77(2):362-368.
[27］ SCHENCK H A. Improved integral formulation for acoustic radiation problems[J]. Journal of the Acoustical Society of America，1968，44(1):41-58.
[28］ TOBOCMAN W. Calculation of acoustic wave scattering by means of the Helmholtz integral equation. I[J].Journal of the Acoustical Society of America,1984,76(2):599-607.
[29］ JUNGER M C, FEIT D. Sound, structures, and their interaction[M].Cambridge, MA，US: MIT Press, 1986.

第41卷第1期
2020 年1月兵工学报ACTA
ARMAMENTARIIVol.41No.1Jan.2020

[1]	XU Yanfeng, PAN Xiefan, LIU Benqi. Detection Method for Underwater Slow Moving Targets Based on Frequency-wavenumber Spectrum Analysis in ReverberationEnvironment [J]. Acta Armamentarii, 2020, 41(9): 1880-1886.
[2]	MA Shilei, WANG Haiyan, SHEN Xiaohong, HE Ke, DONG Haitao. Detection Method of VLF Acoustic Signal in Complex Marine Environmental Noise [J]. Acta Armamentarii, 2020, 41(12): 2495-2503.
[3]	XU Guojun, ZHANG Lin, HAN Mei, FAN Peiqin. Research on the Underwater Target Motion Analysis Based on Acoustic Field Interference Feature Match [J]. Acta Armamentarii, 2019, 40(5): 1038-1049.