Mechanical-hydraulic Co-simulation Of Full Hydraulic Steering System And Optimal Design Of Mining LHD

As the important models of modern engineering machinery, LHD is one of the mine non-rail transport equipment, mainly used in underground coal mine short wall mining face. Steering system is one of the important components of the LHD. Its performance directly determines the performance of LHD. So the research on dynamic characteristics of a steering system is of great significance.This paper takes 17C00CLX3 type LHD of mine explosion-proof roller as the research object. The work principle of steering mechanism is analyzed,and the model of in-situ steering resisting moment is established. The factors affecting the in-situ steering resistance moment and influencing trend are analyzed. In this paper, the working principle of load-sensing full hydraulic steering system is analyzed in detail. According to the structure and working principle of priority valve and steering gear, the models are established based on AMEsim HCD library, and the model simulation test are carried on, to analysis its dynamic characteristics and verify the correctness of the model.This paper establishes the hydraulic control system model based on theAMEsim and multi-body dynamics model based on ADAMS. AMEsim as the master, mainly for three conditions about quick steering of full load, slow steering of full load and quick steering of light load make mechanical-hydraulic co-simulation. Under different working conditions, the flow rate of priority valve, the speed and displacement of steering cylinder piston rod and the tire force in the process of steering are mainly analyzed. In view of steering cylinder pressure vibration, with the difference of left and right sides of oil cylinder stroke and system pressure as the objective function,the articulated point position of oil cylinder as design variables, using genetic algorithm to optimize the steering mechanism. Make co-simulation to the optimized mechanism, and comparing the results with before optimization.This paper do the research of mechanical-hydraulic co-simulation of load-sensing hydraulic steering system, and aims at the pressure vibration in the process of steering exercise the optimal deign. The optimization results show that the steering arm difference of left and right sides of oil cylinder after optimization is much smaller than before and steering cylinder pressure vibration and system pressure of the optimized mechanism decreases obviously. The research of this paper provides a certain theoretical support for the following design of steering mechanism, which is of great significance.