高温高声压下多孔金属材料吸声特性研究

SOUND ABSORBING PROPERTY OF POROUS METAL MATERIAL AT HIGH TEMPERATURE AND HIGH SOUND PRESSURE LEVEL

在多孔金属材料的湍流统计理论的基础之上,考虑温度高声压对多孔材料声学参数的影响,得到适用于高温高声压条件下多孔金属材料的分析模型.计算了不同温度和不同声压级条件下声压幅值与金属纤维直径、孔隙率等物理参数的关系.研究发现其他参数不变,在高温条件下,随温度升高多孔金属材料的声压幅值增大;在高声压条件下,随着声压的升高多孔金属材料的声压幅值增大.所得理论结果与已有的实验中的规律符合良好,为多孔金属材料在高温、高声压条件下的减振降噪设计提供了理论基础.

On the basis of the statistical turbulence theory of the porous metal material, an analysis model which can be used under the high temperature and high sound pressure level （SPL） conditions is obtained by considering the influence of temperature and pressure on the acoustical parameters. The relationship between the acoustical pressure amplitude and wire diameter, porosity and other physical parameters at various temperatures and SPL are investigated. It is shown in the results that the acoustic pressure amplitude increases with the increase of either the temperature or the sound pressure level. The theoretical results are in good agreement with existing experimental results. The work in this paper provides a theoretical basis for the vibration and noise reduction acoustic pressure level. design of porous metal materials at high temperature and high