Cnc Universal Tool Milling Machine The Xk8140 ​​spindle System Combined With The Ministry Of Equivalent Kinetic Parameters Identification Method

Dynamical characteristics of mechanism, such as vibration, noise, stability, comfortable, thermal stability etc., are the most important key factors, especially to modern machines which are very complex, precise and running at high speed. There are so many factors to affect dynamical characteristics of mechanical system. So, to study dynamical characteristics of mechanical system must be deal with many subjects. Mechanical Joints are natural structures of all mechanical system. Under running conditions, it has complex dynamical characteristics with damping and elasticity and affect so many dynamical characteristics of mechanical system.Machine Tools is a important tool in industry society, its dynamical characteristics affect directly many products' quality. So, improving dynamical characteristics of machine tool is very significant. Many studies proved damping and elasticity of machine tool' s Joints is greater than that of mechanical structure, so Joints affect dynamical characteristics of machine tools very much. The thesis is a project of 'Establishing Technique Center of Kunming Mill Machine Factory' which is a co-project of Yunnan Province and Kunming University of Science and Technology. The project is to study the shaft Joints of XK8140. The shaft Joints are simplified as damper and spring in this thesis and modeled with C0MBIN14 element in ANSYS. By vibration measurement and FEA we can identify equivalent parameters of the shaft Joints, and at last establish restricted finite model of the shaft.EMA and Parameter Identification Technique is one of methods to analysis and solve complex mechanical dynamical problems, and is a new technique integration of theory analysis, computing and experiment. By vibration experiment, FRF of mechanical system be measured, modal parameters of modal orders be identified in modal analysis theory.In the thesis, many vibration signals be acquired by impulsing test and sweeping frequency test under the conditions that the shaft is assembled and unassembled, and analysis these data by virtual instruments programmed by LabVIEW, at last modal parameters be identified. In ANSYS , establish the finite element model of the shaft and the restricted finite element model, and do modal analysis, compare experiment modal parameters of the shaft and the restrictedshaft, and establish the finite element model of the free shaft and the restricted shaft. By the mearns of slowly adjusting K of COMBIN14 to confirm stiffness of the shaft Joints, and obtain damping of the shaft Joints, at last.For so many complex factors can affect mechanical Joints,it is difficult to obtain a prcise result, so there are still some problems need to be solved. In the thesis, the author want to use a new modern technique and try to find a new way of identifying equivalent dynamical parameters of mechanical Joints. The method by comparing modal analysis results of the restricted finite element model of the shaft with experiment results, and adjusting K of C0MBIN14 to identify equivalent dynamical parameters of Joints is significant to learn.