栓接结合部刚度建模与特性分析

发布时间：2018-05-22 19:16

本文选题：栓接结合部 + 微观表征　；参考：《振动工程学报》2017年01期

【摘要】：为在图纸设计阶段准确获取数控机床关键功能部件中栓接结合部的动态特性,综合考虑结合面和螺栓两部分因素,运用WM函数和功率谱函数表征表面微观形貌特征,利用统计学方法和Mindlin理论建立结合面刚度模型,最终建立栓接结合部法向与切向刚度模型,根据模态试验与有限元法对比验证所建模型的正确性。通过分析表面粗糙度、法向载荷和栓接结合部刚度之间的关系,结果表明:法向载荷的大小影响结合面微观形貌特性,载荷越大,真实接触面积越大,表面粗糙度越小;在相同法向载荷下,表面粗糙度越小,栓接结合部的刚度越大;栓接结合部的刚度随着法向载荷的增加而递增,其速率是先快后慢,且相互之间呈现明显的非线性关系,但当载荷较小时,栓接结合部的法向刚度与法向载荷呈线性关系,可采用线性化方法获取栓接结合部的动态特性。
[Abstract]:In order to accurately obtain the dynamic characteristics of the bolted joints in the key functional components of NC machine tools in the drawing design stage, the micro-morphology of the surfaces is characterized by WM function and power spectrum function. Based on the statistical method and Mindlin theory, the stiffness model of the joint surface is established, and the normal and tangential stiffness models of the bolted joint are established. The correctness of the model is verified by comparing the modal test with the finite element method. By analyzing the relationship among surface roughness, normal load and joint stiffness, the results show that the size of normal load affects the micro-morphology of the bonding surface. The larger the load, the larger the real contact area and the smaller the surface roughness. Under the same normal load, the smaller the surface roughness, the greater the stiffness of the bolted joint, and the stiffness of the bolted joint increases with the increase of the normal load, and the speed of the joint increases first and then slowly, and there is an obvious nonlinear relationship between them. However, when the load is small, the normal stiffness of the bolted joint is linearly related to the normal load, and the dynamic characteristics of the bolted joint can be obtained by the linearization method.
【作者单位】：西安建筑科技大学机电工程学院;国网东营供电公司;
【基金】：国家自然科学基金资助项目(51305327,51475352) 高等学校博士学科点专项科研基金资助项目(20136120120020) 陕西省自然科学基金项目资助(2014JQ7270)
【分类号】：TG502.31

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