Experimental Study On Active Vibration Control Of Multi-stage Gear Transmission System

The gear transmission system is one of the most widely used mechanical transmission systems.However,due to the machining accuracy of the gear itself,the gear transmission system is subjected to excitation from the profile error,time-varying stiffness,meshing shock,etc.in operational process,the gear transmission system inevitably generates vibration and noise.In severe cases,the life and performance of the entire system can be drastically reduced.Therefore,in order to improve the stability and safety of the gear transmission system,it is particularly important to research the internal mechanism of the gear transmission system and reduce the vibration and noise of the system.Since the gear transmission system generates multi-harmonic vibration under the dynamic excitation,this paper designed an active control structure with built-in bimorph ceramic actuator;optimized the piezoelectric actuator by dynamic analysis of the gear system.The optimal control position was based on the classical PID(Proportional,Integral,Derivative)algorithm,and the Adaptive Fuzzy PID(AFPID)controller was designed.The simulation analysis and experimental verification of the multi-stage gear transmission system were carried out by applying the active control algorithm.The experimental results showed that the AFPID control algorithm has good control effect on harmonic vibration at different speeds and is superior to classical PID control.The research content of the subject mainly includes:(1)Based on the idea of generalized finite element,considering the interaction between gears,shafts,bearings and boxes,the dynamics of the gear transmission system was modeled by the idea of dynamic substructure.Based on the dynamical model,the control position of the piezoelectric actuator was optimized,the modal control force was used as the optimization standard of the piezoelectric actuator,and the simulated annealing algorithm was used to optimize the position of the actuator.(2)The gear transmission system was established in UG,and the virtual prototype was built into ADAMS(Automatic Dynamic Analysis of Mechanical Systems).The dynamical simulation analysis of ADAMS was carried out under different conditions,and the main influences on the vibration of the gear system were analyzed.Factors provided a theoretical basis for active vibration control experiments.(3)Based on the classical PID control algorithm,the AFPID control algorithm was proposed for the multi-harmonic vibration of the gear transmission system.The joint simulation of the vibration control of the gear system with the AFPID controller was established.The simulation results proved the correctness of the active control structure and control algorithm.(4)Established an experimental platform for active vibration control of the gear transmission system.Through the experiment,the control effect of the control algorithm under various working conditions was researched,and the vibration control effect of the established active control structure and AFPID control algorithm on the gear box were verified,compared with the PID algorithm.The experimental result showed that both AFPID algorithm and PID algorithm have obvious control effects on the vibration of the gear system,and the control effect of AFPID control algorithm was obviously better than the classic PID control,which can attenuated the vibration at the target frequency by 5-10 dB.