结合面广义间隙的等效模型研究  

Study on equivalent model of generalized clearance of joint surface

作　　者：李小彭[1] 梁亚敏[1] 郭浩[1] 鞠行[1] 闻邦椿[1] 

机构地区：[1]东北大学机械工程与自动化学院,辽宁沈阳110819

出　　处：《振动工程学报》2014年第1期25-32,共8页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(51275079);新世纪优秀人才支持计划资助(NCET-10-0301);中央高校基本科研业务费专项资金资助(N110403009)

摘　　要：为了从微观和宏观相结合的角度研究结合面的动态特性,首先研究了考虑摩擦因素的结合面接触刚度分形模型;然后以组合梁为研究对象,把梁结构及它们之间的结合面重构为由固体-广义间隙-固体系统,即把结合面等效为广义间隙,利用结合面接触刚度的分形模型与材料应变能等效的方法,获得了结合面的广义间隙的材料常数,并据此材料常数进行组合梁的有限元分析;最后,为了进一步确定所建立结合面接触刚度分形模型的正确性和结合面等效方法的合理性,进行了组合梁的模态试验,把有限元分析的结果和实验结果进行比较,结果表明运用这种等效方法来处理结合面是非常合适的,结果也间接地表明了所建立的结合面接触刚度的分形模型是正确的。To study the dynamic characteristics of joint surfaces from the perspective of combination of macroscale and microscale,first of all,a fractal model is established for the contact stiffness of the joint surface with the friction factor considered.Moreover,as an instance study,the substructures and their joint surface of a composite beam are reconstructed as a solid-generalized clearance-solid system.Thus,the joint surface is regarded as the generalized clearance,and its material constants are obtained by making equal of the fractal model of the contact stiffness and the strain energy of the material.The finite element analysis of the composite beam is conducted based on the derived material constants and the modal test is conducted as comparison.The comparison results show the validity of the fractal model of the contact stiffness and the rightness of equivalence method.

关 键 词：机械振动 结合面 接触刚度 分形模型 广义间隙 

分 类 号：TH113.1[机械工程—机械设计及理论]