用于间接获取耦合界面频响函数的变截面频响探针研究  

Variable cross-section FR probe technique for indirectly getting immeasurable FRFs of a coupling interface

作　　者：孟天涯 王军[1,2] 郭蓓蓓 张小英 郭睿 

机构地区：[1]江南大学机械工程学院，江苏 无锡 214122 [2]江苏省食品先进制造装备技术重点实验室，江苏 无锡 214122

出　　处：《振动与冲击》2017年第24期130-135,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金(51205167)

摘　　要：针对传统逆子结构理论在实测中耦合界面响应数据难以获得的问题,在已有等截面频响探针技术的基础上,为调和等截面探针过细无法固定传感器、施加激励和过粗难以深入到系统耦合界面的矛盾,提出一种更为实用的变截面频响探针技术。基于杆件纵向振动的通用动力学方程,对变截面面积函数进行代换,从而得出变截面杆件纵向振动方程式的解。通过理论推导,得到变截面频响探针技术的公式。为了去除频响探针自身质量对测量结果的影响,对变截面频响探针技术公式进行了优化。运用有限元方法对变截面频响探针技术进行了验证。结果表明变截面频响探针技术可以用来获取界面响应的不可测数据,且相比等截面探针更为实用。To solve the problem of difficultly getting response data of an interface between substructures with the traditional inverse substructure method,based on the existing constant cross-section FR probe technique,reconciling the contradiction that a too thin constant cross-section FR probe was unable to fix sensors and exert excitation and a too thick one was unable to enter deeply a system's coupling interface,a variable cross-section FR probe technique was proposed.Firstly,based on the general dynamic equation of longitudinal vibration rods,the solution to the variable cross-section rods' longitudinal vibration equation was derived through the substitution of variable cross-section function. Then,the formulas for variable cross-section FR probe technique were obtained through theoretical derivation. These formulas were optimized to remove effects of the probe's mass on the measured results. Finally,the proposed technique was verified with the finite element method. It was shown that the variable cross-section FR probe technique can be used to indirectly get immeasurable data of interface responses.

关 键 词：逆子结构 频响函数 频响探针 变截面 

分 类 号：TH212[机械工程—机械制造及自动化] TH213.3