The Optimization Design For The Steering System Of WC5 Dump Vehicle

WC5 dump truck is used to transport coal and materials in the coal mine. The front and back part of the truck are hinged together. The truck belongs to the articulated steering vehicles.WC5 dump truck needs frequently steering due to the narrow tunnel which has many turns and small corner. The steering performance of WC5 must be optimized to ensure the truck steering smoothly and get a small steering resistance. There are a lot of structure parameters and motion parameters which influence the steering performance of the truck. The structure parameters include the truck mass center location, the distance from hinged point of truck to the truck axles, the distance from hydraulic cylinder hinged point to the hinged point of the truck, the distance from hydraulic cylinder hinged point to the symmetry axis of the vehicle and wheelbase, etc. Motion parameters mainly include steering resistance torque and output torque of the hydraulic cylinder, etc.The main researches of WC5 dump truck steering system are as follows:1. The mathematical model of WC5 articulated steering system is established. Based on the theoretical research, the optimization objective function of system is established. The target parameters of the function are comprised of the wheelbase, the distance from hinged point of truck to the truck axles, the distance from hydraulic cylinder hinged point to the hinged point of the truck and the distance from hydraulic cylinder hinged point to the symmetry axis of the vehicle. The optimization goals of the function are getting the minimum value of steering resistance torque, the maximum value of steering cylinder output torque and the minimum turning radius.2. The objective function is optimized by the MATLAB software. The optimal design theory of genetic algorithm is defined, and the MATLAB program of the target function is written. After running the optimization calculation program in MATLAB genetic algorithm toolbox, the optimal objective function value and the optimal objective parameters are obtained. The correctness of the optimization results is illustrated by a large number of graph data.3. The optimized and non-optimized three-dimensional structure models of the truck are established. According to the structure size requirements, the simplified models of truck components subject are established by using Pro/Engineer software. The Assembly model of WC5 is obtained. Through the MATLAB optimization results, the model of paper establishes the simplifying model of WC5 is modified,and the interference check is finished.4. The optimized and non-optimized steering simulation results of the WC5 sturcture model are compared. The in-situ steering of the WC5 structural model is simulated using ADAMS software. The correctness of the optimization design is validated by analyzing the torque on tires and the output torque of steering cylinders.5. The optimized and non-optimized steering simulation results of the WC5 sturcture model are compared. The in-situ steering of the WC5 structural model is simulated using ADAMS software. The correctness of the optimization design is validated by analyzing the force on hinge joints of the truck models, the torque on articulated points of oil cylinder and the steering radius.An original optimization method-genetic algorithm is applied in this research. The multi-body dynamics simulation analysis of WC5 is finished using virtual prototype software. The subject not only provides theoretical support for the optimization design of the truck, but also finds a new direction for the optimal design of articulated steering vehicle. The precision of vehicle design and the work efficiency of articulated vehicle are improved by using the optimization design idea in this paper. The development cycle and reduce cost of the quondam optimization are reduced by the application of genetic algorithm and virtual prototype simulation analysis method.