Design And Optimization Of Large Rear-dump Mining Truck Base On Ore Loading

Large rear-dump mining truck works in harsh environment such as mining,engaged in ore and other goods loading,transportation and unloading operations,and the body suffers a variety of complex impact load.As one of the important conditions in the operation of the mine,the loading makes the truck exposed to big impact from goods,especially in loading large ore.During the loading,to the truck and the driver,the vibration can have negative impact and even cause security risk.In this paper,based on the condition of loading large ore,rigid and flexible coupling model of the whole truck was established,and the finite element model and the multi-body model were used to analyze the loading condition.Based on the established numerical model,multi-objective optimization design of frame structure and vehicle vibration reduction system were conducted.Firstly,using ADAMS software,a rigid and flexible coupling model of large rear-dump mining truck model was developed based on multi-body dynamics method.Secondly,based on ANSYS software platform,the simplified model of the ore and body were established and the impact load was obtained by the explicit dynamic method.The impact load was then loaded onto the rigid-flexible coupling model of the truck,and finally the model of the truck under ore impact was finished.In this way,the method of combining finite element model with multi-body model was realized.Then,the influence of the frame size parameters on the rigidity and quality of the frame was analyzed.And the parameters of the damping support system and different loading conditions to the cab’s vibration(amplitude and acceleration)were analyzed.Finally,the Pareto design front was obtained by multi-objective optimization design of the frame size parameters based on the goal of increasing the frame’s stiffness and reducing the quality.Based on the reduction of the maximum amplitude and acceleration of vibration of the cab during the loading process,the damping and stiffness of the vehicle damping support system were optimized and Pareto front was obtained.In this paper,based on ADAMS software,the rigid and flexible coupling model of the large rear-dump mining truck was developed.The introduction of flexible body modeling method,taking into account the main deformation components in the loading,ensured the accuracy of the model.And relative to the finite element model,the new model is time saving,easy to parameterize and easy to incorporate into the vehicle early multi-objective optimization design.On one hand,according to the loading conditions,the model of the truck body was simplified reasonably,and the impact load was extracted by the finite element method and loaded on the rigid-flexible coupling model of the truck to realize the simulation of the loading condition.The finite element explicit dynamic method was used to solve the impact load to ensure the accuracy.On the other hand,using the multi-body dynamics method to complete the simulation of the impact of the whole truck ensures the efficiency of the solution.The combination of the finite element method and the multi-body research method provides a new way to study the problem.In addition,the obtained optimization results based on the analysis of loading conditions can significantly improve the frame stiffness and light weight level,reduce the cab vibration amplitude and acceleration,and improve the safety of drivers and the truck itself.The optimization design results provide a reference for the truck designers.