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有源点激励有限长圆柱壳体辐射声场特性
引用本文:武国启.有源点激励有限长圆柱壳体辐射声场特性[J].机械工程学报,2012,48(5):76-80.
作者姓名:武国启
作者单位:大连测控技术研究所 大连 116013
基金项目:国家安全重大基础研究资助项目(61387)
摘    要:理论研究单点激励和多点激励时有限长圆柱壳体辐射声场特性。采用Donnell壳体理论和模态分析法,建立单点激励和多点激励有限长圆柱壳体声辐射数学模型。根据声辐射计算数学模型,计算并分析单点激励和多点激励时圆柱壳体低频段声辐射近场和远场特性。研究结果表明:随着激励力频率的提高,圆柱壳体声辐射功率和辐射效率提高,辐射声压增大,且激励力作用方向为声能量主要辐射方向;在声辐射近场,频率越低声压衰减越快,且具有一定起伏变化特性;在声辐射远场,不同辐射方向声压变化规律不同,但其声压衰减规律都近似为球面波衰减。

关 键 词:圆柱壳体  声辐射  有源激励

Radiation Sound Field Performance in Finite Length Cylindrical Shell by Active Point Excitation
WU Guoqi.Radiation Sound Field Performance in Finite Length Cylindrical Shell by Active Point Excitation[J].Chinese Journal of Mechanical Engineering,2012,48(5):76-80.
Authors:WU Guoqi
Affiliation:WU Guoqi (Dalian Scientific Test & Control Technology Institute,Dalian 116013)
Abstract:Radiation sound field performance of single-point and multi-point excitation on finite length cylindrical shell is studied theoretically.Donnell shell theory and modal analysis method are used to establish mathematical models of single-point and multi-point excitation on finite length cylindrical shell of sound radiation.Calculation and analysis of low frequency sound radiation characteristics of near-field and far-field on the single-point and multi-point excitation cylindrical shell are based on sound radiation mathematical model.Results show that with the increasing of the excitation force frequency,sound radiation power and efficiency of cylindrical shell increase,radiation sound pressure enhances,and the direction of sound energy radiation is same as excitation force acting direction;at the near-field,the sound pressure attenuates quickly as the frequency falls and has certain fluctuation characteristics;at the far-field,the rules of sound pressure changing are different on different radiation directions,and the attenuation of sound pressure are approximate to spherical wave attenuation.
Keywords:Cylindrical shell Sound radiation Active excitation
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