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An acoustic boundary element method using time -averaged variables for predicting broadband high frequency fields.

机译：一种使用时间平均变量的声学边界元方法，用于预测宽带高频场。

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摘要

This work sets forth a new method for predicting the spatial variation of mean square pressure within enclosures containing high-frequency broadband sound fields and light to moderate absorption. In the new method, the enclosure boundaries are replaced by a continuous distribution of broadband uncorrelated sources, each of which provides a constituent field expressed in terms of mean square pressure and time average intensity variables. Superposition of these fields leads to the overall mean square pressure and time average intensity as a function of position. Boundary conditions for radiating and absorbing surfaces are recast in terms of energy and intensity variables. The approach is implemented as a boundary element formulation for efficient evaluation of the pressure and intensity fields in enclosures. In contrast to traditional boundary element methods, the new method is independent of frequency. A two-dimensional model problem enclosure and irregular physical enclosure are investigated to verify the two-dimensional form of the new method. A three-dimensional model problem enclosure is investigated to verify the three-dimensional form. The exact analytical solution for the mean square pressure distribution within the model problem enclosures is obtained and compared to the results predicted by the new method. The mean square pressure in the irregular enclosure is obtained through experimental measurements. The comparisons indicate that the new method is a significant improvement upon classical diffuse field theory and computationally efficient relative to traditional boundary element methods and ray tracing techniques.
机译：这项工作提出了一种新方法，用于预测包含高频宽带声场和轻度至中度吸收的外壳内均方压的空间变化。在新方法中，外壳边界被宽带不相关源的连续分布所取代，宽带不相关源中的每一个都提供了一个以均方压力和时间平均强度变量表示的组成字段。这些场的叠加导致总的均方压力和时间平均强度随位置变化。辐射和吸收表面的边界条件根据能量和强度变量进行了重塑。该方法实现为边界元素公式，可有效评估外壳中的压力场和强度场。与传统的边界元方法相比，新方法与频率无关。研究了二维模型问题外壳和不规则物理外壳，以验证新方法的二维形式。研究了三维模型问题附件，以验证三维形式。获得了模型问题外壳内均方压力分布的精确解析解，并将其与新方法预测的结果进行了比较。不规则外壳中的均方压力是通过实验测量获得的。比较表明，该新方法是对经典扩散场理论的重大改进，并且相对于传统的边界元方法和射线跟踪技术而言，其计算效率很高。

著录项

  • 作者

    Rouse, Jerry Wayne.;

  • 作者单位

    Duke University.;

  • 授予单位 Duke University.;
  • 学科 Acoustics.
  • 学位 Ph.D.
  • 年度 2004
  • 页码 399 p.
  • 总页数 399
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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