农用路谱模拟液压试验台设计与试验

Design and experiment of hydraulic experiment bed of road spectrum simulation for agricultural machinery

为农业机械解决路谱模拟困难、试验成本高等问题,研制一种路谱模拟液压试验台。设计液压系统的方案和主要参数,采用压力补偿技术确保系统流量稳定可控,将所设计的液压系统在AMESim软件中建模并仿真。仿真结果表明:液压缸在上升过程中,速度稳定在0.1 m/s,液压缸工作腔压力和液压泵工作压力分别为10.09 MPa和10.54 MPa,液压缸在下降过程中,速度稳定在0.064 m/s,液压缸工作腔压力和液压泵工作压力分别为21.02 MPa和15.01 MPa,仿真结果有效地验证了所设计系统的可行性。同时,对试验台分两个工况进行试验测试,在工况1条件下,X、Y两个方向的角度最大值分别为7.92°和7.81°,在工况2条件下,X、Y两个方向的角度最大值分别为5.01°和5.55°,试验台可有效模拟不同路谱,为行走机械的路谱试验提供装备基础。

A new kind of hydraulic experiment bed of road spectrum simulation was researched to solve the problems of road spectrum simulation difficulty and high experiment cost for agricultural machinery.Technical scheme and main parameters of hydraulic system were designed,and pressure compensation technique was adopted to ensure stable and controllable flow rate of the system.The designed hydraulic system was modeled and simulated in AMESim.Simulation results illustrated that during the rising process of the hydraulic cylinder,the speed was stable at 0.1 m/s,and cylinder working chamber pressure and hydraulic pump working pressure were 10.09 MPa and 10.54 MPa respectively.During the descending process of the hydraulic cylinder,the speed was stable at 0.064 m/s,and cylinder working chamber pressure and hydraulic pump working pressure were 21.02 MPa and 15.01 MPa,respectively.The simulation results effectively verify the feasibility of the designed system.Then the experiment bed was tested in two working conditions.Under the working condition 1,the maximum angles of the X and Y directions were 7.92°and 7.81°.Under the working condition 2,the maximum angles of the X and Y directions were 5.01°and 5.55°.The experiment bed can effectively simulate different road spectrum and provide the experimental equipment basis for the road spectrum experiment of walking machinery.