Optimized acoustic properties of cellular solids
Optimized acoustic properties of cellular solids
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DOI：
10.1121/1.427094
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发表时间：
1999-07
影响因子：
2.4
通讯作者：
Xiaolin Wang;T. Lu
中科院分区：
文献类型：
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作者：
Xiaolin Wang;T. Lu
本文研究了具有简单泡孔形态的充气多孔材料的最佳泡孔尺寸和形状、泡孔尺寸变化、样品厚度和样品后空气腔深度对吸声性能的影响。重点是刚性框架的多孔泡沫，例如，铝合金泡沫和蜂窝。波传播的控制方程求解通过使用点匹配方法，并预测与已知的解析解进行了比较。研究了Voronoi多边形单元尺寸变化的影响。引入域匹配方法来获得选定频率范围内单元尺寸和形状、样品厚度和腔深度的最佳组合。在孔隙率一定的情况下，泡孔形状对吸声性能的影响较小。对于样品厚度、空腔深度和孔隙率的实际组合，最佳吸声体的优化单元尺寸为约0.1 mm。细胞大小的随机分布倾向于收紧规则。
The optimized cell size and shape, cell size variations, sample thickness, and air cavity depth behind the sample for best sound absorption performance of air-filled porous materials having simple cell morphologies are studied in this paper. The focus is on cellular foams that are rigidly framed, e.g., aluminum alloy foams and honeycombs. The governing equations of wave propagation are solved by using the point-matching method, and the predictions are compared with known analytical solutions. The effects of cell size variations are studied for Voronoi polygons. A domain-matching method is introduced to obtain the optimal combination of cell size and shape, sample thickness, and cavity depth for selected ranges of frequency. At given porosity, the effect of cell shape on sound absorption is small. The optimized cell size for best sound absorbers is on the order of ∼0.1 mm for practical combinations of sample thickness, cavity depth, and porosity. A random distribution of cell sizes tends to tighten the reg...