Vibration and Sound Radiation of Sandwich Beams With Honeycomb Truss Core
Vibration and Sound Radiation of Sandwich Beams With Honeycomb Truss Core
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DOI：
10.1115/imece2003-41552
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发表时间：
2004-11
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影响因子：
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通讯作者：
M. Ruzzene
中科院分区：
文献类型：
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作者：
M. Ruzzene
摘要分析了桁架夹芯梁的振动和声辐射特性。芯的结构由一系列相同的单元格组成，这些单元格沿着梁长度并跨越芯厚度重复。每个单元由组装成框架结构的梁元件组成。这里考虑的布局与典型的蜂窝图案安排通过芯的厚度。这种设计代表了一种替代传统应用的蜂窝夹层结构。所提出的配置提供了有趣的结构以及声学特性的夹层梁。有限元模型的开发，以评估所考虑的一类夹层梁的结构和声学行为。该模型是制定采用动态形状函数，直接来自梁单元的分布参数模型。这种公式，通常表示为“频谱”，允许一个准确的评估所考虑的结构在高频率和有限数量的元素的动态行为。此外，频谱模型可以容易地与基于傅立叶变换的对由流体加载结构辐射的声音的分析相耦合。该模型被用来分析梁的性能与各种核心配置。从结构响应和声透射衰减指数两个方面进行了比较。此外，计算和比较了无界声半平面中梁振动引起的声压级和声压分布。考虑了半月形和重入形结构，研究了堆芯几何形状对结构响应和声辐射的影响。
Abstract The vibrations of and the sound radiation from sandwich beams with truss core are analyzed. The structure of the core is composed of a sequence of identical unit cells repeating along the beam length and across the core thickness. Each cell is composed of beam elements assembled to form a frame structure. Layouts with the typical honeycomb pattern arranged through the thickness of the core are here considered. This design represents an alternative with respect to the traditional application of honeycombs in sandwich construction. The proposed configuration provides sandwich beams with interesting structural as well as acoustic characteristics. A finite element model is developed to evaluate the structural and the acoustic behavior of the considered class of sandwich beams. The model is formulated by employing dynamic shape functions, derived directly from the distributed parameter model of beam elements. This formulation, often denoted as “spectral”, allows an accurate evaluation of the dynamic behavior of the considered structures at high frequencies and with a limited number of elements. In addition, the spectral model can be easily coupled with a Fourier transform based analysis of the sound radiated by the fluid-loaded structure. The model is used to analyze the performance of beams with various core configurations. The comparison is carried out in terms of structural response and sound transmission reduction index. In addition the sound pressure levels and distributions resulting from the beam vibration in an unbounded acoustic half-plane are evaluated and compared. Hexagonal and re-entrant configurations are considered in an effort to study the effects of core geometry on structural response and acoustic radiation.