铰接车辆液压动力转向系统动态特性仿真

利用液压控制理论和SIMULINK控制系统仿真软件,以DQ-18型地下运矿卡车(地下汽车)液压动力转向系统为例,计算并仿真铰接车辆液压动力转向系统的动态特性,仿真结果为设计液压动力转向机构提供理论依据.研究结果表明:负载质量决定液压转向系统的响应速度,响应速度与负载质量成反比.为改善液压转向系统的动态特性,应减少转向油缸负载质量,同时缩短转向系统液压管路的长度以减少液压管路中油液质量;液压系统的有效液体体积弹性模数对液压系统的动态响应速度影响很大,严格控制液压系统中空气的含量,同时液压管路采用钢管以及缩短液压胶管的长度,以改善系统的动态特性.该液压动力转向系统仿真模型针对不同的液压转向系统,只需改变个别参数,就可对液压转向系统进行仿真和优化设计.

Simulation of dynamic characteristics of hydraulic power steering system of articulated vehicles

The hydraulic power steering system(HPSS) of model DQ-18 underground mining dump truck is used as a simulation example,the dynamic characteristics of the HPSS of articulated vehicle are simulated and discussed with SIMULINK software and hydraulic control theory,the simulation results provide theoretical basis for designing HPSS.The simulation results of HPSS show that the mass of load determines the velocity of HPSS,and the response velocity of HPSS varies inversely as the mass of load. In order to improve the dynamical characteristics of HPSS,the load mass should be decreased. The hydraulic pipeline length of HPSS should be shorted to reduce the oil mass in the hydraulic pipelines.The effective fluid volumetric modul of elasticity has a great influence upon the dynamic response velocity of the HPSS.The amount of air entering into HPSS must be controlled,and steel pipes are adopted and the hydraulic pipelines length should be decreased to raise the dynamic response velocity of HPSS and improve the dynamic characteristics of HPSS.The simulation model established in this paper can be used in different HPSS, the simulation study and optimal design of HPSS can be made by setting different parameters.