Prediction and measurements of the influence of boundary conditions in a standing wave tube
Prediction and measurements of the influence of boundary conditions in a standing wave tube
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驻波管边界条件影响的预测和测量
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
Johansen
中科院分区：
文献类型：
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作者：
T. Vigran;L. Kelders;W. Lauriks;P. Leclaire;F. T.;Johansen
本文比较了驻波管（昆特管）和自由场法两种不同方法测量声吸收系数和阻抗的结果。在昆特管中安装样品是非常重要的。本文分析了管壁约束对弹性多孔材料吸声系数的影响。与材料在自由场中的行为相比，管壁摩擦力的作用是使材料变硬。给出了测量结果和模型计算。模型中使用的材料参数是通过单独的测量确定的。
The paper concerns a comparison between measurement results of the acoustic absorption coefficient and impedance using two different methods, the standing wave tube (Kundt's tube) and a free field method. The mounting of the sample in the Kundt's tube is known to be very important. In this paper, the effect of the constraints at the tube wall on the absorption coefficient of an elastic porous material is analysed. It will be shown that the effect of the friction offered by the tube wall is to stiffen the material, compared to its behaviour in the free field. Measurement results together with model calculations are presented. The material parameters used in the models have been determined by separate measurements.