Influence Analysis and Vibration Restraint Solutions Research on the Underwater Acoustic Monitoring System
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nalysis and Vibration Restraint Solutions Research on the Underwater Acoustic Monitoring System WANG Zhena, b, c, ZHENG Yia, b, c, *, MAO Yu-fenga, b, c, HE Chuan-lina, b, c, GONG Jin-longa, b, c, HAO Zong-ruia, b, c a Institute of Oceanographic Instrumentation, Qilu University of Technology (Shandong Academy of Sciences),
Qingdao 266061, China b Shandong Provincial Key Laboratory of Ocean Environmental Monitoring Technology, Qingdao 266061, China c National Engineering and Technological Research Center of Marine Monitoring Equipment, Qingdao 266061,
China Received January 2, 2020; revised April 20, 2020; accepted May 24, 2020 ©2020 Chinese Ocean Engineering Society and Springer-Verlag GmbH Germany, part of Springer Nature Abstract In order to reduce the hydrodynamic and structural influences on the detection accuracy especially in the very-lowfrequency range, some vibration restraint methods are raised, which are the wrapped fairing improvement, the floating body shape improvement and the cable vibration reduction treatment. Through the improvement analysis and experimental comparison, the final treatments are proposed, namely the multilayer wrapped fairing structure with composite materials, the floating body with NACA0024 airfoil section and X-shape tail spoiler, as well as the brush cable. The sea test is carried out to evaluate the vibration restraint effect. Through comparison of the responses to the ocean ambient noise and the direction of arrival (DOA) estimations with the same underwater transmitting transducer, the results indicate that the horizontal floating platform with vibration restraint treatment has obvious flow resisting effect especially in low frequency range and more accurate DOA estimation. Key words: hydrodynamic interference, vibration restraint, fairing, DOA estimation, computational fluid dynamics Citation: Wang, Z., Zheng, Y., Mao, Y. F., He, C. L., Gong, J. L., Hao, Z. R., 2020. Influence analysis and vibration restraint solutions research on the underwater acoustic monitoring system. China Ocean Eng., 34(5): 718–729, doi: https://doi.org/10.1007/s13344-020-0065-x
1 Introduction In order to evaluate the ocean ambient noise and detect the different underwater objects, the long-term and continuous observation of the underwater sound field is required (Mavrakos and Chatjigeorgiou, 1997). Nevertheless, the platforms are easily affected by the surrounding flow, generally in the form of vortex-induced vibration. In particular, resonance vibration will occur when the vibration frequency coincides with the natural frequency of the platform, which will have a serious impact on the accuracy of hydroacoustic measurement. Therefore, it is necessary to study the hydrodynamic characteristics of the platform and the vibration isolation measures of the sensor. This paper will introduce several vibration restraint methods for the floating underwater acoustic monitoring platform including the mooring cabl
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