The Linear Electromagnetic Load Simulation Test Bench Research On Dynamic Balance

In the field of mechanical engineering,due to the increase of the complexity of product structure and function,the importance of load simulation technology for mechanical properties has been paid more and more attention.The linear electromagnetic load simulation test bench is an experimental device used to study the characteristics of the structure with the form of linear motion.The study of dynamic balance of the test bench can reduce vibration and fatigue failure from design,and is of great significance for improving the stability of the load simulation system.Based on the mechanism comprehensive dynamic balance theory,this paper carries out the comprehensive dynamic balance optimization for the six bar mechanism of the linear electromagnetic load simulation test bench.The work of this article is as follows:Firstly,the composition and principle of the test system,load system,transmission mechanism and measurement and control system of the linear electromagnetic load simulation test bench designed by our team are introduced.Secondly,by using the linear independent vector method,the conditions for complete balance of the six bar mechanism of the test bench are derived.It is proved that the six bar linkage is not suitable for complete balance of vibration force.Next,the kinematics parameters needed to be used in the comprehensive dynamic balancing of the mechanism are solved.The structure and parameters of the counterweight to be applied are designed and analyzed.Then,the dynamic balance indexes of the test bench are solved.A comprehensive dynamic equilibrium equation with the root mean square of vibration force,vibration torque and input torque as the dynamic balance index is established.The multi-objective optimization of the comprehensive dynamic equilibrium equation is carried out by means of optimization solutions in MATLAB.The various optimization methods and their optimization results are compared and the counterweight parameters satisfying the optimization target are obtained.Fanally,the analysis of the changes of the vibration force,vibration torque,input torque,motion pair counterforce and dangerous position load after the comprehensive dynamic balance of the six bar mechanism is made.The pin is checked and redesigned.The modal changes of six bar linkage before and after balance are analyzed by Simulation.It is proved that the comprehensive dynamic balance improves the safety of the test bench.