Research On Optimization Of Double Steering Mechanism Based On Cooperative Learning Differential Evolution Algorithm

Gardening tractors often travel in mountainous and hilly areas,traditional garden tractors have small steering angle and insufficient steering flexibility due to their own steering mechanism,so some mountain tasks with narrow space can not be completed for them,Therefore,improving the steering flexibility of garden tractors has become a research hotspot in recent years.Based on these research hotspots,a double steering mechanism is studied in this paper,and a cooperative learning differential evolution algorithm is proposed,and the algorithm is used to optimize the double steering mechanism with the minimum steering side slip and the maximum steering torque.The main research contents of this paper as follows:(1)The steering side slip and steering thrust torque objective function of the double steering mechanism are established.The steering slip and steering thrust are key indicators for evaluating vehicle performance,which is related to the driving stability,work efficiency and the adaptability of the working environment.Therefore,based on the analysis of the steering principle of the double steering mechanism,the mathematical model of steering side slip and hydraulic cylinder steering thrust torque is established by homogeneous coordinate transformation method,Then the optimal design objective function is established with the minimum steering side slip and the maximum steering thrust torque.(2)A cooperative learning differential evolution algorithm is proposed.Aiming at the shortcomings of basic differential evolution algorithms,a cooperative learning differential evolution algorithm is proposed.Then,the four optimization algorithms including the cooperative learning differential evolution algorithm are implemented by MATLAB programming and simultaneously optimize the test function and the objective function,and then the optimal values under the optimization of each algorithm are obtained,By comparing the optimal values,the superiority of the proposed algorithm is verified,and the optimal design parameters of the mechanism are obtained.(3)A virtual prototype model is established and then to analyze the motion simulation results.Using the parameter values under the optimization of each algorithm,the virtual prototype model corresponding to each algorithm is established in ADAMS,and the simulation results of steering torque of hydraulic cylinder are obtained through motion simulation,and the comparative analysis of the simulation results between the algorithms and the comparative analysis of the simulated and theoretical calculations are carried out.(4)Topological optimization design of the connector in the mechanism.The connector acting as a role of connecting the front and rear bodies,so the stress concentration is serious,and the rationality of the topology optimization structure is verified by stress analysis of the connector before and after optimization.