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Theoptimizedcellsizeandshape,cellsizevariations,samplethickness,andaircavitydepthbehi...
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 region where combinations of sample thickness and cavity depth achieve high sound absorption coefficient.
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practical combinations of sample thickness, cavity depth, and porosity. A random distribution of cell sizes tends to tighten the region where combinations of sample thickness and cavity depth achieve high sound absorption coefficient.
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优化细胞的大小和形状,细胞大小的变化,试样厚度,空气腔深度背后的样本作最好的吸声性能的充气多孔材料具有简单的细胞形态研究在这方面的文件。重点是对细胞泡沫是硬性的框架,例如,铝合金泡沫和蜂窝。执政的方程波传播的是解决用点匹配的方法,和预测相比,与已知的解析解。影响细胞大小的变化是研究的Voronoi多边形。一个域匹配方法介绍,以获取最佳结合细胞的大小和形状,试样厚度,腔深度为选定的范围,频率。在考虑孔隙度,影响细胞的形状对吸声是小。优化细胞大小以取得最佳的声音吸收,是对秩序的; 0.1毫米为
实际的组合试样厚度,腔深度和孔隙度。一个随机分布的细胞的大小,往往以加强所在地区的组合样品的厚度和腔深度达到高吸声系数。
实际的组合试样厚度,腔深度和孔隙度。一个随机分布的细胞的大小,往往以加强所在地区的组合样品的厚度和腔深度达到高吸声系数。
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