Test And Optimization Of Nonlinear Vibration Damping System For Wheel Loader Cab

Mechanical vibration and noise are severe during driving and operation,which seriously affects driving comfort,handling stability and operation productivity.at the same time,it is faced with severe working conditions such as complex road excitation and different working objects.the working process is often accompanied by violent vibration of the car body,which has a negative impact on vehicles,drivers and the surrounding environment.Therefore,the vibration control of cab system has become an important issue to be solved urgently in the design and manufacture of high-end engineering equipment in china.In this paper,aiming at the severe vibration of a wheel loader,it is proposed to reduce the vibration of the whole vehicle by changing the parameters of the cab damping system.through the initial vibration test of the original vehicle,the vibration transmissibility of the cab,the root mean square value of the vertical weighted acceleration of the seat and the human comfort are analyzed.Based on the measured vibration signal of the frame,the nonlinear vibration reduction system model of cab-seat-human body is established,and compared with the actual vehicle test,the maximum error is about 6%.then,the root mean square of vertical acceleration of cab and seat is taken as the target,and genetic algorithm is used for multi-objective optimization.Finally,the optimization results under one group of weight coefficients are selected to verify the vibration reduction performance of cab and seat before and after optimization.Finally,the rubber shock absorber with reasonable parameters is designed through the optimization results.Then,after production,the shock absorber and seat after production are installed on the real vehicle for real vehicle test.The test results show that after improvement,the root mean square value of the vertical cab is reduced by 16%,and the root mean square value of the vertical acceleration of the seat is reduced by 53%,which improves the vibration damping performance.This paper can provide a theoretical method for the vibration reduction system design of cab suspension and seat suspension of loaders and similar models.