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The Theoretical and Experimental Research on Underwater Sound Insulation Performance in Low-Frequency

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Tutor: LiZuo
School: Harbin Engineering University
Course: Underwater Acoustics
Keywords: The sound of water,Low-frequency,Finite Element,Sound insulation,Sound intensity
CLC: U666.7
Type: Master's thesis
Year:  2010
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Abstract:
Submarines , and often have to work in hundreds of meters deep , sound insulation laid on the hull member to be able to withstand high static pressure of a few MPa , the sound insulation performance of the transformer case to be as small as possible . For the measurement of noise samples in the the underwater transformer case of the sound insulation performance , the paper design produced a high - pressure measuring tank and sound field scanning measurement system , the experimental study of the sound insulation samples . In this paper, the finite element method used for the measurement of sound insulation structure of a cylindrical tank of water with hemisphere head acoustic performance of the simulation, the simulation frequency range of 100Hz to 2000Hz . The simulation uses a the pulsating ball source and dipole source sound source the sample sound insulation effect of sound insulation in the form of research . Reference for this simulation results , design simulation of water depth change pressure tank and the working platform sound intensity scanning device for precise control of the angle of rotation . Using developed pressure tank Measurement of sound insulation system , different distribution density of sound insulation performance of of two sound insulation samples were carried out experimental studies , the measured quantities for the insertion loss of the acoustic radiation power . Radiated sound field measurement using dual hydrophone sound intensity the array scanning near-field and a single hydrophone vertical array scanning far-field in two ways . Near-field sound intensity cross-spectral method and approximation to calculate the sound intensity distribution and acoustic radiation power ; measured far-field sound pressure seen as a plane wave approximation to calculate the sound intensity distribution of the measurement surface acoustic radiation power to find the sound insulation performance of the characterization of noise sample insertion loss . The results show that : the finite element method for the study of the performance of the underwater complex structures of sound insulation is applicable; experimental measurement system designed to meet the testing requirements of the underwater pressure low-frequency sound insulation ; sound insulation performance of the sample and only a single sample structure, performance , and the distribution of the sample , therefore , if the optimal layout for better sound insulation effect .
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