滑动结合面的宏介观动态特性研究

发布时间：2018-06-18 14:23

本文选题：滑动结合面 + 润滑　；参考：《昆明理工大学》2015年硕士论文

【摘要】：在机床日趋向高精密以及高性能方向发展的形势下,机床导轨结合面的特性对机械整机动态性能的影响也愈发明显,并且在机械结构的整体刚度中,结合面的刚度往往是比较薄弱的环节,所以对结合面的研究就显得尤为重要。同时机械结合面介观尺度的动态特性是进行复杂机械系统以及微细机械系统的动态设计和优化设计的关键技术和基础研究理论之一,因此研究机床导轨结合面介观尺度的力学特性以及宏观动态特性与介观力学特性之间的联系具有非常重要的理论意义和工程应用价值,是一个应用前景非常广阔并在国内机床行业发展中起重要作用的科技问题。本文在接触力学、模态分析、分形理论、流体力学以及平均流动的广义Reynolds方程等知识的基础上,结合粗糙表面内部润滑油的渗出机理与结合面间油膜的挤压特性,分别从宏观和介观两个方向对结合面的动态特性进行了分析与研究。论文通过对粗糙表面介观W-M分形函数、分形理论、流体特性以及平均流动的广义Reynolds方程等方面的总结与分析,推导得到了部分膜状态下结合面综合等效刚度与综合等效阻尼的数学模型,并通过MATLAB对其进行了仿真分析,结果表明：当结合面实际接触面积比率达到一定值时,结合面的接触刚度与接触阻尼达到一个比较理想的状态,该分析结果可以为粗糙表面的加工与初始法向载荷的施加提供重要的指导。在前期研究的基础上,利用工程等效原理,基于等效单自由度系统的通用结合面单元面积参数识别方法,设计并制造了消除基础位移影响的滑动导轨物理实验平台,同时,通过实验对装置动、静两个状态下的刚度和阻尼参数进行了识别,结果显示在合适的法向载荷下结合面的刚度与阻尼达到比较良好的状态,与结合面介观动态特性的仿真分析结果相符。本文以实际应用为出发点,实现了部分膜状态下结合面介观力学特性的建模与仿真分析以及滑动结合面动态特性参数的获取,为结合面宏介观动态特性的联系提供了良好的参考价值。
[Abstract]:With the development of the machine tool towards high precision and high performance, the influence of the characteristics of the guide rail joint on the dynamic performance of the machine is becoming more and more obvious, and in the overall stiffness of the mechanical structure, The stiffness of the joint surface is often a weak link, so the study of the joint surface is particularly important. At the same time, the dynamic characteristics of mesoscopic scale of mechanical interface is one of the key technologies and basic research theories for dynamic design and optimization design of complex mechanical systems and micro-mechanical systems. Therefore, it is of great theoretical significance and engineering application value to study the mechanical properties of the mesoscopic scale and the relationship between the macroscopic dynamic characteristics and the mesoscopic mechanical properties of the joint surface of the machine tool guideway. It is a very broad application prospect and plays an important role in the development of domestic machine tool industry. In this paper, based on the knowledge of contact mechanics, modal analysis, fractal theory, hydrodynamics and the generalized Reynolds equation of average flow, the exudation mechanism of lubricating oil on rough surface and the extrusion characteristics of interplanar oil film are combined. The dynamic characteristics of the bonding surface are analyzed and studied in both macroscopic and mesoscopic directions. In this paper, the mesoscopic W-M fractal function of rough surface, fractal theory, fluid characteristics and generalized Reynolds equation of mean flow are summarized and analyzed. The mathematical model of the composite equivalent stiffness and damping of the bonding surface under partial membrane state is derived and simulated by MATLAB. The results show that when the actual contact area ratio of the bonding surface reaches a certain value, The contact stiffness and contact damping of the contact surface reach an ideal state. The analysis results can provide important guidance for the machining of rough surface and the application of initial normal load. Based on the previous research and the engineering equivalent principle, a physical experimental platform for sliding guideway is designed and manufactured based on the general identification method of the area parameters of the element of the coupling plane based on the equivalent single-degree-of-freedom system. At the same time, a physical experimental platform is designed and manufactured to eliminate the influence of the foundation displacement. The stiffness and damping parameters of the device under dynamic and static conditions are identified by experiments. The results show that the stiffness and damping of the joint plane reach a better state under proper normal load. The results are consistent with the simulation results of the mesoscopic dynamic characteristics of the bonding surface. In this paper, based on the practical application, the modeling and simulation of mesoscopic mechanical properties of bonding surfaces and the acquisition of dynamic parameters of sliding bonding surfaces are realized. It provides a good reference value for the connection of mesoscopic dynamic characteristics of surface macroscopes.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG502

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