High-temperature acoustic properties of porous metal materials measuring and research.

To study the properties of sound absorption characteristics of porous metallic materials at high temperature conditions, the sound absorption properties of porous materials with temperature changes was studied firstly in theory. And then, a temperature-controlled high-temperature impedance tube measurement device was designed. Different results of different acoustic properties porous metal material were measured at different high temperatures, and the relationships between absorption properties and temperatures were studied. The predicted and measured results are in good agreement basically, and the theoretical analysis and design of measuring device are reasonable. [ABSTRACT FROM AUTHOR]