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Hybrid finite element developments for vibroacoustic analysis of vehicle systems in the mid-frequency range.

机译：用于中频范围内车辆系统振动声学分析的混合有限元技术。

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摘要

New developments in the hybrid Finite Element Analysis (hybrid FEA) are presented in this Thesis. The hybrid FEA mothod combines conventional FEA methods with energy FEA for analysis over a complete frequency range. Formulations for mid-frequency analysis of plates spot-welded to beams are developed. Conventional FEA models are employed for modeling the behavior of the stiff members in a system. Appropriate damping elements are introduced in the connections between stiff and flexible members in order to capture the presence of the flexible members during the analysis of the stiff ones. The component mode synthesis method is combined with analytical solutions for determining the driving point admittance at joints between stiff and flexible members and for defining the properties of the damping elements which represent the flexible members when analyzing the stiff components. The hybrid FEA developments are validated by comparing results of the hybrid FEA with results from very dense Finite Element Analyses (FEA) for structures of increasing complexity. A new formulation for computing the radiation efficiency of a plate radiating into a finite acoustic cavity is also developed. It allows the capture of the modal characteristics of the acoustic cavity which can be important in the mid-frequency range. The coupling effect between the acoustic cavity and the flexible plate is fully accounted in the formulation. The new radiation efficiency development is employed in the hybrid FEA formulation when an acoustic cavity is considered in the interior of a structural system. The new development is validated by comparing results of the hybrid FEA with results of a very dense FEA analysis for a structural-acoustic system. Finally, a case study that integrates conventional and energy based boundary element analyses for a seemless acoustic prediction over a wide frequency range is presented. The acoustic signature of a military vehicle is computed from 10Hz ∼ 2,000Hz using both methods (BEA from 10Hz ∼ 500Hz, EBEA from 500Hz ∼ 2,000Hz). Then, the detection distance of the vehicle is computed by employing the ADRPM (Acoustic Detection Range Prediction Model) software.
机译：本文介绍了混合有限元分析（混合有限元分析）的新进展。混合有限元分析方法将传统的有限元分析方法与能量有限元分析相结合，可在整个频率范围内进行分析。开发了用于点焊到梁的板的中频分析的公式。常规的FEA模型用于对系统中刚性构件的行为进行建模。在刚性和柔性构件之间的连接中引入适当的阻尼元件，以便在对刚性构件进行分析期间捕获柔性构件的存在。组件模式综合方法与分析解决方案相结合，用于确定在刚性构件和柔性构件之间的连接处的驱动点导纳，并在分析刚性构件时定义代表弹性构件的阻尼元件的特性。通过将混合FEA的结果与非常复杂的结构的非常密集的有限元分析（FEA）的结果进行比较，可以验证混合FEA的发展。还开发了一种用于计算辐射到有限声腔中的板的辐射效率的新公式。它允许捕获声腔的模态特性，这在中频范围内可能很重要。配方中充分考虑了声腔与柔性板之间的耦合效应。当在结构系统内部考虑声腔时，在混合FEA配方中采用了新的辐射效率开发方法。通过将混合有限元分析的结果与结构声系统的非常密集的有限元分析的结果进行比较，可以验证新开发成果。最后，提出了一个案例研究，该案例将常规方法和基于能量的边界元素分析相结合，可以在很宽的频率范围内进行平滑的声学预测。两种方法都从10Hz到2,000Hz计算军事车辆的声学特征（BEA从10Hz到500Hz，EBEA从500Hz到2,000Hz）。然后，通过使用ADRPM（声学检测范围预测模型）软件来计算车辆的检测距离。

著录项

  • 作者

    Hong, Sang Bum.;

  • 作者单位

    University of Michigan.;

  • 授予单位 University of Michigan.;
  • 学科 Engineering Marine and Ocean.; Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2004
  • 页码 116 p.
  • 总页数 116
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 海洋工程;机械、仪表工业;
  • 关键词

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