Test Bench For Dynamic And Static Comprehensive Performance Of Elastic Coupling

As a common component for torque transmission,elastic coupling has good damping and displacement compensation performance.It is widely used in various fields,but at the same time,it also has the adverse effects of motion lag and torsional vibration.How to weigh its advantages and disadvantages has become a difficult problem for researchers.In order to improve the performance of elastic coupling and improve its working reliability and service life,it is necessary to carry out fatigue test.Through accurate detection,it can guide the improved design of elastic coupling and improve the performance index.Most of the existing coupling testing instruments adopt horizontal structure,and the testing accuracy is low.According to the requirements of testing parameters and the shortcomings of existing coupling testing instruments,this paper puts forward a vertical coupling testing bench,and completes the structural design of the bench.In view of the small torsional angular displacement of elastic coupling under rated torque,an eccentric mechanism with adjustable force acting point and a torque loading mechanism with flexible leaf spring are designed,which greatly reduces the machining difficulty of eccentric mechanism and reduces the influence of fitting clearance on loading eccentricity.Firstly,the flexible leaf spring and coupling in the test-bed are modeled and simulated.After preliminarily setting the geometric parameters of the flexible leaf spring,it is brought into the built mathematical model,and the change curves between the torque and angle of the coupling and the length of the flexible leaf spring are obtained.It is found that the change curves of the elastic couplings with different stiffness coefficients are different,so the length of the flexible leaf spring is finally determined according to the torque and angle range of the coupling to be tested.The finite element simulation analysis was carried out on some components of the test bench,including vertical support cylinder and transmission shaft components,to ensure the reliability of the experimental results.Secondly,the test-bed measurement and control system is developed.The hardware of measurement and control system adopts the control mode of industrial computer+data acquisition card +PLC.The high-speed data acquisition card is used to acquire the torque and angle of the coupling,and the eccentric loading mechanism and the adjustment of the loading action point are driven by the servo motor.The software system includes experimental test flow,data acquisition and processing module,man-machine interface and database programming.Finally,two different types of elastic couplings were tested statically and dynamically on the test bench.The hysteresis loop between torque and angular displacement of coupling is obtained by static experiment,while the dynamic experiment mainly studies the change rule between dynamic stiffness and test frequency under different loading frequencies.The experimental results show that the vertical structure elastic coupling test-bed proposed in this paper has high test precision,stable and reliable work,and meets the expected design requirements.