文章摘要
孙阳,成刚,安俊英,徐海亭.水中弹性体的特征频率与声特性[J].声学技术,2013,32(3):185~191
水中弹性体的特征频率与声特性
The eigenfrequencies and acoustic characteristics of underwater elastic target
投稿时间:2012-04-04  修订日期:2012-07-23
DOI:10.3969/j.issn1000-3630.2013.03.003
中文关键词: 弹性体  特征频率  谐振  声特性
英文关键词: elastic target  eigenfrequencies  resonance  acoustic characteristics
基金项目:哈尔滨工程大学水声技术重点实验室基金项目(9140C200105120C20082)
作者单位E-mail
孙阳 中国科学院声学研究所北海研究站, 山东青岛 266023 sunyang1010@sina.com 
成刚 中国科学院声学研究所北海研究站, 山东青岛 266023  
安俊英 中国科学院声学研究所北海研究站, 山东青岛 266023  
徐海亭 中国科学院声学研究所北海研究站, 山东青岛 266023  
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中文摘要:
      对弹性壳体的特征频率与声散射、声辐射的谐振特性进行了对比研究。应用最小势能原理建立弹性体的有限元方程, 并结合边界积分方程得到水中弹性体特征方程, 采用Lanczos方法直接求解特征频率并进行固有振动模态分析。通过几种弹性壳体的特征频率与声特性的对比, 验证了激励源频率在特征频率处会产生较强的谐振散射和谐振辐射, 谐振对声特性影响的大小则与激励方式有关。具有附加结构的复杂线形长壳体的固有振动模态表明, 低阶振动模态主要是主体部分径向和轴向振动, 而附加结构对振动影响较小, 但会使前几阶的特征频率偏移;高阶固有振动模态的主体和附加部分都产生形变, 但主体的轴向振动是主要特征。
英文摘要:
      The comparison between the eigenfrequencies of an elastic target and the resonance characteristics of scattering and radiation from the elastic target is studied. By applying the minimum potential principle, the finite element equation for the elastic object is established, and by linking the integration formulation of the object surface, the eigen equation of the elastic target in water is obtained. The Lanczos algorithm is used to calculate the eigenvalue, and the inherent vibration modes are analyzed. The comparison between the eigenfrequencies and the acoustic characteristics validates that the strong resonant scattering and radiation are produced at the eigenfrequnecies, and the amplitudes of acoustic scattering and radiation depend on the power excitation mode. The analysis of the inherent vibration modes of a complex slender shell with an attached structure show that the lower vibration modes assume the axial and radial vibrations of the main body; the attached structure has no effect on the vibrations, but it makes the eigenfrequencies of the first several orders move to higher frequencies. As the frequency increases, the inherent vibration modes assume the vibrations of main body and attached structure, but the axial vibration is the dominant characteristic.
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