Research On Simulation Of Extended Tuned Mass Damper Based On Wheel Excavator Counterweight

The vibration and noise of construction machinery during driving and operation are severe,which seriously affect the driving comfort,handling stability and operation productivity.In order to solve the problem of severe vibration of a certain type of wheel excavator,this paper proposes to use its counterweight to design extended tuned mass damper(ETMD)for damping research.Through the establishment of its dynamic model,theoretical analysis and performance simulation under multiple working conditions,the control effect of ETMD system on body vibration is discussed,and the damping characteristic parameters of ETMD system are optimized.Finally,a damping damper with reasonable parameters is designed.The specific research contents are as followsUnder the driving condition,the half vehicle damping model and dynamic differential equation with or without ETMD system are established,and the amplitude frequency response curve is obtained.According to the differential equation,the Simulink simulation model is established.Through the simulation comparison under different road level excitation,the vibration response of vehicle body with and without ETMD system under driving condition is obtained,and the influence of ETMD system parameters on the vibration response of vehicle body is analyzed.Under the crushing condition,according to the parameter relationship between the wheel excavator and the crushing hammer,the output parameters of the crushing hammer under different engine power are obtained,and the simulation input excitation model is established.The damping model and dynamic differential equation of the whole machine with and without ETMD system under crushing condition are established,and the corresponding dynamic simulation model is established in Simulink.By running the simulation model,the vibration response of the vehicle body with and without ETMD system under crushing condition is obtained.Taking the minimum RMS value of body mass center vertical acceleration under various working conditions as the optimization objective,the dynamic simulation model established in the previous two chapters as the fitness function,the damping characteristic parameters of ETMD system as the optimization variables,and the dynamic deflection of suspension as the constraint,Simulink and MATLAB are co simulated by using the multi-objective optimization method based on genetic algorithm,The optimal solution set under multiple working conditions is obtained,and the optimal solution is selected according to the weight coefficient method.Finally,the optimized parameters are used for dynamic simulation again,and the vibration responses before and after optimization are obtained,and the reliability of optimization is analyzed.Finally,according to the comprehensive performance requirements of the damper,the appropriate damping material is selected to determine the structure of the damper.By understanding the relationship between its various parameters,the geometric parameters of the structure are obtained,and the structural loss factor is calculated,which provides a theoretical basis and method for the design of the damper.The method of using counterweight as an extended tuned mass damper proposed in this paper can provide a new method for the study of vibration reduction of wheeled hydraulic excavators.