【作者】 张波； 陈天宁；

【Author】 Zhang Bo;Chen Tianning;

【机构】 宁夏大学机械工程学院； 西安交通大学机械工程学院；

【摘要】 为了探讨多孔金属材料在高温、高声强等极端环境下应用的可能性,本文从孔隙填充流体介质的运动、连续、能量等基本方程出发,考虑温度场变化与非线性对流作用,严格推导出了不同场边界和场变务件下温度-渗流耦合波动方程。其次,利用一维非均匀波导理论,推导出了高温场变环境下多孔金属材料的声阻抗方程。最后,通过半解析和数值方法对材料中的声传播和衰减特性进行了计算。本研究为处理复杂非常规条件下多孔金属的工程应用提供了理论基础。更多还原

【Abstract】 To investigate application of porous metals under high temperaturer,sound pressure level(abbr.SPL),and so on.In this work,strarting from kinematics,contineous,energy equaitons of air,we strictly deduced a temperature-flow coupling wave motion equation with different temperature field boundary conditions by means of considering effects of temperature and nonlinear air flow.Then the acoustic surface impedance equation of porous material under variable temperature conditions is obtained therefore with non-uniform wave guide theory.Finally,the sound propogating and attenuating properties in porous metal are evaluated using semi-analytical and numeral methods.The study in this paper lays a foundation for further usage of porous metals under complex extreme conditions such as high temperature and SPL.更多还原