Research On Nonlinear Dynamics Of Inner Displaced Indexing Cam Mechanism

With the continuous development of mechanical products to high precision,high efficiency and high stability,the research on properties of mechanical products is becoming more and more concerned.As a new type of indexing cam mechanism with large indexing number and high load capacity and compact structure,the inner displaced indexing cam mechanism has a broad application prospect.The whole transmission system of the inner displaced indexing cam mechanism is composed of gear drive and cam-pin drive.It has strong nonlinearity.The change of its system parameters and external conditions have an important influence on the kinematic performance and transmission accuracy of the mechanism.Therefore,based on the existing research and considering the nonlinear factors of the system,the dynamic characteristics and the transmission accuracy of the inner displaced indexing cam mechanism are discussed systematically through theoretical research,simulation analysis and experimental research.The research content has high practical value for the dynamic design and performance improvement of the inner displaced indexing cam mechanism.Firstly,the transmission principle and structure characteristics and law of motion of the inner displaced indexing cam mechanism are introduced in detail,and the research process,modeling and solving method of mechanical system dynamics are analyzed.It provides a theoretical basis for the accurate study of dynamic performance of the mechanism system.Secondly,on the basis of synthetically analyzing the factors that affect the dynamic performance of the inner displaced indexing cam mechanism,a torsional dynamic model of the nonlinear system is established by using the Lagrangian equation.The change law of gear contact stiffness and cam-pin equivalent torsional stiffness are analyzed.According to the nonlinear dynamic differential equation of the mechanism,the Runge-Kutta method is used to solve the model,and the output dynamic response of the mechanism is obtained.It provides a theoretical basis for the dynamic simulation analysis of the virtual prototype.Thirdly,the rigid flexible coupling dynamic model of the inner displaced indexing cam mechanism is established by SolidWorks,ADAMS and ANSYS software.The contact force between cam and pin is analyzed.And the influence of speed and load on the dynamic performance of the mechanism is analyzed.The effects of gear meshing clearance and cam-pin clearance on the dynamic performance of the mechanism are compared and analyzed.The dynamic indexing accuracy of the model is obtained by simulation and analysis of the prototype.Finally,using modern testing technology,virtual instrument technology and sensor technology,the dynamic performance test beach of the prototype is built.The output dynamic response in time domain and frequency domain of the mechanism is analyzed by experiments.The reliability of the theoretical model and the test bench is verified.