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首页> 外文会议>SAE Noise and Vibration Conference and Exhibition >Development of the Acoustic EFA (Energy Flow Analysis) Software NASEFA{sub}(C++) R1 and Its Applications to Automobiles
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Development of the Acoustic EFA (Energy Flow Analysis) Software NASEFA{sub}(C++) R1 and Its Applications to Automobiles

机译：声学EFA（能量流分析）软件NASEFA {sub}（C ++）R1及其应用于汽车的应用

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摘要

Energy Flow Boundary Element Method (EFBEM) is developed as a promising tool of the noise analysis of system structures in medium-to-high frequency ranges. EFBEM is numerical method which solves the energy-governing equation using boundary element technique for the noise prediction of complex structures where the exact solution is not available. Based on EFBEM, a noise prediction software named 'NASEFA (Noise Analysis System by Energy Flow Analysis)' has been developed. NASEFA consists of three major parts, i.e., translator, model converter and solver module. The translator makes NASEFA BE-model from bulk data framed by the preprocessor of a commercial FEM software, and the model converter changes BE-model to EFBE-model including the various data such as structural materials, medium properties, sources and boundary conditions (acoustic energy density, intensity and absorption rate). NASEFA solves the acoustic energy density and intensity on boundary and in field, and moreover, it analyzes the interior/exterior noise problems for single and multiple domains in two- and three-dimensions. This paper describes some applications of NASEFA to noise prediction of various automobiles, in addition to the concept and capabilities of the software.
机译：能量流边界元素方法（EFBEM）被开发为中高频率范围内系统结构的噪声分析的有希望的工具。 EFBEM是使用边界元技术来解决能量管理方程的数值方法，用于确切的解决方案的复杂结构的噪声预测。基于EFBEM，已经开发出名为“NASEFA（通过能量流分析的噪声分析系统）”的噪声预测软件。 NASEFA由三个主要部分，即转换器，模型转换器和求解器模块组成。翻译器使NASEFA是由商业有限元软件的预处理器构成的批量数据的批量数据，而模型转换器将模型变为EFBE模型，包括各种数据，如结构材料，中等性质，来源和边界条件（声学能量密度，强度和吸收率）。 NASEFA解决了边界和领域的声学能量密度和强度，而且，在两维和三维中分析了单个和多个域的内部/外部噪声问题。除了软件的概念和能力之外，本文还介绍了各种汽车对各种汽车噪声预测的一些应用。

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