基于分形理論的機(jī)械結(jié)合部接觸特性參數(shù)研究
[Abstract]:The contact characteristic parameters include contact stiffness, contact damping and static friction coefficient, contact thermal impedance and contact resistance resistance and other parameters. For the mechanical combination part, the first three contact parameters directly affect the static and dynamic characteristics of the whole machine. The stiffness and damping of the mechanical joint part in a machine tool are occupied by the stiffness and damping of the material itself. The leading position is the key parameter to study the static and dynamic performance of the whole machine. However, due to the complex nonlinear characteristics of the contact characteristics of the joint, the mechanism produced by the contact characteristic parameters of the joint has not been thoroughly studied in a long period of time, which leads to the precise establishment of the mechanical joint dynamic model in theory. It will become very difficult. Therefore, this article will be devoted to studying the contact characteristics of the joint from the mechanism, establishing the analytical model of the contact characteristic parameters, analyzing the influencing factors, providing a method for the high precision parameterized modeling, and providing the theoretical basis for the dynamic optimization design of the mechanical structure. The main work and innovation of this study are as follows: A model of contact mechanics based on fractal theory. The contact surface is characterized by the improved three-dimensional WM fractal function. The elastic, elastoplastic and fully plastic contact mechanical properties of the micro convex body are analyzed from the microscopic contact characteristics of the joint. Based on the Hertz contact theory and the fractal theory, the elastoplastic change of the micro convex body is established. The contact mechanics model of micro convex body is put forward by the contact load and contact area equation of the shape stage. Using the fractal theory of the area distribution of the island, the contact mechanics model of the joint is established, and the fractal parameters and the law of the normal load on it are analyzed. The contact force model of the micro convex body and the four classical contact theories and the experimental numbers will be established. According to the comparative analysis, the validity and universality of the contact model proposed in this paper are proved. An analytical model of the joint stiffness and tangential contact stiffness parameters is established. By using the contact mechanics model of the micro convex body and the sliding contact theory of Mindlin sphere, the static stiffness of the normal and tangential contact of the elastic and elastoplastic zones is obtained. Based on the fractal theory, the normal stiffness parameter model of the normal and tangential direction is established. At the same time, the vibration differential equation of the dynamic contact between the sphere and the plane is studied. The linearized static stiffness of the contact of the micro convex body is deduced. The relationship between the dynamic stiffness and the static stiffness with the fractal characteristic joint is first established. On the other hand, the joint is explored in the fluid. The average Reynolds equation of rough surface contact under partial film lubrication is established based on the fractal theory. The analytical solution of the fluid average pressure is obtained by the separation variable method. The fluid stiffness is derived, and the analytical model of the equivalent stiffness parameters of the joint with the solid contact stiffness and the fluid stiffness is established and analyzed. The analytic model of the damping parameters of the normal and tangential contact is studied. Based on the fractal theory and the Sabot vibration contact theory, the energy loss and storage expression for each cycle of the joint are derived, and the energy loss and storage of the tangential energy per cycle are calculated by combining the fractal theory and the Mindlin theory. On the other hand, the damping characteristic of the joint under the condition of fluid lubrication is studied, and the average Reynolds equation of the partial film lubrication is used to solve the damping of the contact method under the lubrication state of the partial membrane. Finally, the solid contact damping and the fluid damping are finally established. The analytical model of the equivalent damping of the combined part is analyzed and the action law of various factors is analyzed. The analytical model of the static friction coefficient of the combined part is derived. The maximum static friction force of the micro convex body is solved by the third strength theory. Based on the fractal contact model, the most large static friction force and the static friction coefficient model of the joint are established. The friction characteristics of the joint under the state of fluid lubrication are derived. Based on the Newton's law of viscosity and the analytical solution of the average pressure of the fluid, the expression of the friction force in the part of the film lubrication is derived. The static friction coefficient model in the part of the film lubrication is established. Finally, the surface of the specimen is tested and analyzed to obtain the contact fractal parameter. The modal test of the bolt fixed joint was carried out to obtain the resonant frequency and frequency response function. The friction test bench was built, the friction test was carried out, and the static friction coefficient parameters were obtained. The experimental results verify the correctness of the analytical solution of the contact characteristic parameters derived in this paper.
【學(xué)位授予單位】:華中科技大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2016
【分類號(hào)】:TH111
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