Dynamic Analysis And Stability Study Of Wheel Loader Under Complex Road Conditions

Wheel loaders are a class of construction machinery widely used in road construction,energy development,mine development and other engineering construction and construction fields.In most cases,the working environment is rather harsh.The road conditions are complicated and the road quality is poor during driving.The whole vehicle will generate vibration and shock during driving,especially when the slope is running.Therefore,in-depth dynamic analysis is carried out for complex road conditions to solve the contradiction between poor road conditions and stability,and improve the driving stability under complex road conditions,which is of great significance to the development of loaders and the improvement of driving dynamics.In this paper,the theory of multi-rigid system dynamics is firstly described.The theory,solution method and solution flow of multi-rigid system dynamics are analyzed.The method of solving dynamic equations of multi-rigid system using ADAMS is given.According to the simplified principle of the wheel loader model and the acquisition method of parameters,the three-dimensional geometric model of each subsystem of a wheel loader is established.Determine the UA tire model,establish the engine excitation model,according to the constraint relationship between the various subsystems of the loader and the topology of the vehicle,use the communication equipment to connect the subsystem modules,and create the virtual prototype simulation software ADAMS.The wheel loader dynamics model is selected.The F-class symmetrical road surface and the F-class asymmetric road surface reflecting the actual complex working environment of the loader are selected,and the 2D equivalent road surface model is created.The wheel loader-road system dynamics model is constructed..Through the driving dynamics simulation,the three-way acceleration-time curve of the wheel loader wheel center,seat and bucket under complicated road conditions is obtained.The influence law of load capacity,vehicle speed and road condition on the accelerometer acceleration of the loader is analyzed.The dynamic evaluation index is used to evaluate the driving dynamics of the wheel loader under complicated road conditions,and the driving dynamics characteristics of the wheel loader under different working conditions are obtained.According to the stability evaluation method of the loader,the instability angle of the loader under different working conditions on the lateral ramp and the longitudinal slope is calculated.The wheel loader tilting test rig was established.By analyzing the stability of the wheel loader under complicated road conditions,the instability angle of the wheel loader under different working conditions of the lateral ramp and the longitudinal ramp was obtained.And the law of tipping,comparing the instability angle obtained by the test with the calculated instability angle,verifying the validity of the test results.Through the research of this paper,the preliminary analysis of the driving dynamics of wheel loader under complex road conditions is realized.The vehicle model of wheel loader and the 2D equivalent volume model of F-class asymmetric pavement and F-class asymmetric pavement are established.The dynamic characteristics and stability of the wheel loader under road conditions provide a reference for improving the smoothness and stability of the loader.