摘要
为提高粗糙接触界面的声耦合性能,对超声波与粗糙界面间的相互作用进行研究。通过界面分形模型的建立,得到含分形参数的接触刚度表达式,并结合界面声学模型分析不同耦合条件下声反射系数的变化;搭建超声干耦合实验平台,通过实验测得粗糙铝板表面轮廓,利用结构函数法对分形维数进行测定,并对不同分形维数的粗糙铝板进行受压条件下的反射系数测量。结果表明:对粗糙接触界面施加一定载荷有利于超声波在界面处的传播,且分形维数较大的粗糙铝板达到良好声耦合效果所需的载荷更小,更便于超声干耦合检测的实施。
In order to improve the ultrasonic dry-coupled performance of rough contact interface, the interaction between the ultrasonic wave and the rough interface is studied. The contact stiffness expression with fractal parameters is obtained by establishing the interface fractal model, and the change in acoustic reflection coefficient under different coupling conditions is analyzed by combining the interface acoustic model. The ultrasonic dry-coupling experimental platform is established to measure the surface profile of rough aluminum plate. The fractal dimension is measured with structural function method, and the reflection coefficient of rough aluminum plate with different fractal dimension under pressure is measured. The results show that the coupling performance can be improved by increasing the pressure between the solid surfaces, and the rough aluminum plate with larger fractal dimension needs less load to achieve good acoustic coupling effect, which is more convenient for the implementation of ultrasonic dry coupling detection.
作者
唐东林
吴薇萍
胡琳
汤炎锦
丁超
Tang Donglin;Wu Weiping;Hu Lin;Tang Yanjin;Ding Chao(School of Mechanical Engineering,Southwest Petroleum University,Chengdu 610500,China;School of Mechanical Engineering,Chengdu Technological University,Chengdu 611730,China)
出处
《机械科学与技术》
CSCD
北大核心
2020年第6期910-918,共9页
Mechanical Science and Technology for Aerospace Engineering
基金
四川省科技支撑项目(2017FZ0033)
成都市技术创新研发项目(2018-YF05-00201-GX)
西南石油大学国家重点实验室项目(PLN201828)资助。
关键词
干耦合
反射系数
粗糙接触界面
分形模型
dry coupling
reflection coefficient
rough contact interface
fractal model
