某轻型无人平台车姿下降缓慢故障机制及解决方法研究

Study on the Failure Mechanism and Solution of Slow Descent of the Light Unmanned Platform

某轻型无人平台无法靠自重实现预期的车姿快速下降功能。为了探究其故障机制并查找原因,以该平台为研究对象,基于FLUENT流体仿真软件建立了车姿下降回油路仿真模型并进行了仿真分析。仿真结果表明:该平台车姿下降缓慢是由于车姿回油路油气弹簧端存在较高背压所致,而该背压的形成是由于主溢流油路与车姿回油路串连并共同作用所产生。根据仿真分析的结果,对该平台车姿的液压系统回油路进行优化,将主溢流油路与车姿回油路断开并单独引回油箱,解决了该平台车姿下降缓慢的故障,并通过实车试验得到了验证。

The light unmanned platform can not achieve the expected rapid decent function by self-weight.In order to explore the failure mechanism and cause,taking a light unmanned platform as the research object,the vehicle posture descent oil return circuit simulation model was established based on FLUENT fluid simulation software,and the simulation analysis was carried out.The research shows that the slow decline of the vehicle posture is due to the high back pressure at the end of the oil-gas spring of the vehicle posture return circuit,and the formation of the high back pressure is caused by the series connection of the main overflow oil circuit and the vehicle posture descent oil return circuit and the joint action.According to the results of simulation analysis,the hydraulic system return circuit of the vehicle posture of the platform was optimized.The main overflow oil line and the return oil circuit were disconnected and diverted back to the fuel tank separately,which solves the failure of the vehicle posture decline slowly.The results of simulation analysis were verified by the vehicle test.