应用AMESim双转向器全液压转向系统特性分析

Characteristic Analysis of Full Hydraulic Steering Systemwith Dual Steering Gear Based on AMESim

为全液压转向系统设置双转向器可以解决大排量需求的问题,但此种布置会影响系统的动态响应特性,因此分析系统的可行性。根据某自卸车全液压转向系统的结构特点,对单转向器系统的关键参数进行分析和设计,获取各参数的数值;根据车辆转向参数的需求,对转向系统的压力损失和温升进行校核,以验证系统可否满足需求;根据前述分析,采用AMESim搭建分析模型,通过转角输入验证模型准确性,并验证负载、输入变化对系统特性的影响;基于转向系统试验台,通过输出特性分析,对前述设计和分析模型进行验证。结果可知:双转向器系统压力损失满足要求,最高温升控制在56.8℃,控制在系统要求的范围内;影响双转向器系统输出特性和油液流量的因素主要是方向盘转速和系统负载,其他因素基本无影响,仅对系统的响应时间产生影响;试验测试平台获取的角速度阶跃输入下的,转向器输出口压力、流量放大器输出口流量与仿真分析结果误差控制在5%以内,表明分析模型和结果的可靠性,为此类分析设计提供参考。

The setting dual steering gear for full hydraulic steering system can solve the problem of large displacement demand.This arrangement will affect the dynamic response characteristics of the system,so analyze the feasibility of the system.According to the structural characteristics of the full hydraulic steering system of a dump truck,the key parameters of the single steering gear system were analyzed and designed,and the values of each parameter were obtained.The pressure loss and temperature rise of the steering system were checked,according to the requirements of vehicle steering parameters to verify whether the system can meet the requirements.Based on AMESim,the analysis model of double steering gear hydraulic steering system was built to analyze the impact of changes in angle,slope input,steering load and inlet flow on the system.A full hydraulic steering system test-bed was built to verify the parameter design results and simulation model analysis results.The results show that:the pressure loss of the double steering gear full hydraulic steering system meets the requirements,the approximate value of the system oil temperature rise is 58.4℃,the temperature rise does not exceed the allowable range,and there is no need to set a cooler in the hydraulic sys-tem.The parameters of the dual steering gear model tend to be stable when the slope signal is input at the steering wheel angle.The main factors affecting the performance of dual steering gear system are the speed and load of steering wheel.Under the angu-lar velocity step input obtained by the test platform,the error between the output pressure of the steering gear and the output flow of the flow amplifier and the simulation analysis results is controlled within 5%,indicating the reliability of the analysis model and results,which provides a reference for such analysis and design.