微小流量旋转直驱伺服阀传控特性分析与优化

Analysis and Optimization of Transmission and Control Characteristics of Micro-Flow Rotary Direct-Drive Servo Valve

针对无人机、战术弹、支线民航等小型飞行器航空发动机燃油计量系统与推力矢量系统微小流量的伺服控制需求,就旋转直驱伺服阀偏心球副传动接口与非全周节流阀口等关键结构进行了尺寸约束设计分析,并就节流阀口宽度、球副偏心距以及驱动电机转动惯量等重要参数进行了优化分析,给出了伺服阀结构设计的优化区间。在此基础上,研究提出了电机转角与电流双闭环控制方法,幅频响应实测结果与理论分析较为一致,200 Hz以上高频响应满足实际需求,且双闭环控制方法大幅降低了伺服阀响应超调并提升了稳定性。

Aimed at the micro-flow servo control requirements of fuel metering system and thrust vector system of small aircraft such as un-manned aerial vehicle,tactical missile and regional civil aviation,the size constraint and design analysis of key structures such as eccentric ball pair transmission interface and non-fullcircle throttle valve port of rotary direct-drive servo valve is conducted.The optimization analysis of important parameters such as throttle valve port width,ball pair eccentricity,and driving motor moment of inertia is performed,and the optimization interval of servo valve structure design is given.In addition,a double closedloop control method for motor angle and current is proposed.The measured results of amplitude-frequency response are consistent with the theoretical analysis,and the high frequency response above 200 Hz meets the actual requirements.The double closed-loop control method greatly reduces the response overshoot of servo valve and improves the stability.