Sound absorbing characteristics of fibrous metal materials at high temperatures |
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Authors: | Fugui Sun Hualing Chen Jiuhui Wu Kai Feng |
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Affiliation: | School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China |
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Abstract: | To study the effect of high temperatures on absorbing properties of fibrous metal materials, the calculations of effective density and effective bulk modulus are presented on basis of Dup‘ere’s model and Tarnow’s model. A modifying factor is presented to modify differences between real effective density and the effective density when the fibers regarded straight. The high temperatures effects on acoustic parameters are studied by thermodynamics theories and variable-property heat transfer. The surface specific acoustic impedances and normal incidence acoustic absorption coefficients are discussed theoretically. Finally, a measurement setup is built to verify the theoretical predictions. The experimental results fit the theoretical results well. |
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Keywords: | Sound absorbing Thermal field Fibrous metal material |
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