500m口径球面射电望远镜反射面液压促动器关键性能分析

发布时间：2018-12-13 23:55

【摘要】：针对国家重大科技基础设施项目500 m口径球面射电望远镜(Five-hundred-meter aperture spherical radio telescope,FAST)液压促动器进行分析研究。提出利用齿轮泵泄漏特性及液控单向阀开启特性实现流量闭环的建模方法可使数学模型更准确。设计样机试验并研发试验设备以获取齿轮泵流量压力系数K_q及液控单向阀开启特性K_f两参数。利用Matlab/Simulink软件搭建系统模型分析了促动器在开环外伸及闭环跟踪两模式下的运动特性,并通过试验对系统模型进行对比验证。结果表明:建立的模型能够描述液压促动器的工作原理,参数K_q及K_f与试验结果一致性较好。开环时促动器的速度随输入脉冲频率增加而增大,闭环时促动器在变载荷下可实现稳定跟踪。仿真与试验最大跟踪误差分别为0.15 mm和0.2 mm,满足设计精度要求。该系统模型为FAST液压促动器奠定理论基础,同时可为伸缩回路差异较大的液压系统提供参考。
[Abstract]:The hydraulic actuators of the 500m diameter spherical Radio Telescope (Five-hundred-meter aperture spherical radio telescope,FAST) are analyzed and studied. This paper presents a modeling method to realize the closed loop flow rate by using the leakage characteristics of gear pump and the opening characteristics of hydraulic control one-way valve, which can make the mathematical model more accurate. The prototype test was designed and the test equipment was developed to obtain the two parameters of flow and pressure coefficient K _ St _ Q and the opening characteristic K _ f of hydraulic one-way valve. The system model is built with Matlab/Simulink software to analyze the motion characteristics of the actuator in open loop extension and closed loop tracking mode, and the system model is compared and verified by experiments. The results show that the model can describe the working principle of the hydraulic actuator, and the parameters K _ Q and K _ S _ f are in good agreement with the experimental results. The speed of the actuator increases with the increase of the input pulse frequency in the open loop, and the stable tracking of the actuator can be realized under the variable load in the closed loop. The maximum tracking errors of simulation and test are 0. 15 mm and 0. 2 mm, respectively. The system model lays a theoretical foundation for FAST hydraulic actuators and provides a reference for hydraulic systems with large differences in telescopic circuits.
【作者单位】：中国科学院国家天文台;中国科学院射电天文重点实验室;中国科学院大学天文与空间科学学院;
【基金】：国家自然科学基金(11673040) 国家青年科学基金(11503047)资助项目
【分类号】：TH751

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