Research On The Measurement Of Contact Stiffness And Damping Based On Two Degrees Of Freedom Vibration Sysytems

Connected to each other or in contact with parts of the project,Such as rail, bolts, clamps, bearing rolling elements and raceways, robot joints, gears and other engagement surface,The actual condition of the surface in contact with the surface of the connection or contact performance was related,which directly affect the functionality and reliability of the joits.The description of the mechanical structure of surface contact pair in contact with the characteristics and nature,often involving the contact stiffness and damping parameters, In order to better understanding the impact of the contact stiffness and damping of the contact surface of the contact properties,It launched a lot of research,However,the contact stiffness and damping in the Effects of vibration,often due to its combination of surface microscopic deformation suffered by the normal force is nonlinear,Resulting in surface contact stiffness and damping in contact with the load applied generally non-linear relationship.Plus the contact characteristic surface itself,It can significantly change the nature of the contact stiffness and damping of the contact,Parameter Identification of these uncertainties can not lead to better complete model.Therefore, whether in theory or in the practical application, to find a structure to identify the contact stiffness and damping of the contact under vibration conditions of the process is of great significance for the engineering.This article aside a specific surface in the form of combination, we propose a detection method contact stiffness and damping of the contact system based on two degrees of freedom(DOF), the contact pairs of two contacting bodies were designed into the corresponding two single degree of freedom unit, made up of two single degree of freedom contact coupling unit into two-DOF system, the contact stiffness and damping to be detected is the coupling coefficient between the two. First, set up an experimental platform for two degrees of freedom of the system, using the method of coupling structural response, by establishing binding kinetics and mathematical models face two-DOF system based on surface measurements combined with dynamic parameters, mechanical binding recognition unit area surface of normal contact stiffness and the contact damping, while the stiffness of the spring and known by coupling, to verify the accuracy of the model, since the parameters of a single-DOF for the unit (including cell mass, stiffness, damping) easy to accurately measure making it easy to get the value of the contact and the contact stiffness and damping of experimental data fitting methods. Therefore, this method identified joint parameters versatility, high accuracy, simple and convenient. According to the results, explore analyzed under different load, attenuation coefficient, attenuation circular frequency, contact stiffness, damping factors and other contacts with the contact with the load variation of the contact, and analyzes its mechanism of action.At the same time, the accuracy of the contact stiffness model was verifyied bye the stiffness of spring coupled.It was analyzed and discussed under different loading conditions, attenuation coefficient, attenuation circular frequency, contact stiffness, damping factors in contact with the contact and other contact with the variation of the load and characteristic frequency and damping coefficient on the contact of the contact stiffness and damping, to detect the contact stiffness and damping of the contact provided.Finally, by known coupling stiffness of the spring, thus the accuracy of the contact stiffness model is verified. The contact stiffness and contact damping and the relationship between the characteristic frequency and attenuation coefficient was analyzed, the identification of contact stiffness and damping of the sensitive parameters was found out, And the contact stiffness and contact damping values were calculated on the condition of that the contact materials was T8. Under different load condition, the factors such as Circular frequency attenuation, contact stiffness, contact damping with the contact touch variation of load, impact characteristics of frequency and attenuation coefficient of contact stiffness and damping of the contact were discussed and analyzed。...