伺服作动系统的余度控制

Redundance Control of Servo Actuator System

为了提高伺服作动系统的可靠性，设计了一种三余度的电液伺服作动系统，将伺服阀的力矩马达、喷嘴挡板阀、系统的反馈元件等做成一式三份．并对该结构伺服作动系统进行了深入的理论分析，建立了三余度伺服控制系统的数学模型，分析了余度控制对伺服作动系统动态品质的影响，以及系统出现故障后余度伺服作动系统的动态品质．分析结果表明：伺服作动系统采用余度控制后，系统的动态品质基本不变．但系统在伺服阀线圈一路断开的情况下，余度伺服作动系统仍能正常工作．结果表明：伺服作动系统采用余度技术后，系统性能基本不变，而大大提高了伺服作动系统的可靠性。

In order to improve the reliability of servo system, a triplex electro hydraulic servo actuator system with three torque motors, three jet flapper valves and three sets of feedback components is designed. The authors make a deep theoretical analysis on the system, build up the mathematical model of the triplex electro hydraulic servo actuator system, analyze the effects of the redundance control on dynamic performance of the system and the dynamic performance of triplex electro hydraulic servo actuator system after any trouble happens. The results show when the triplex electro hydraulic servo actuator system is applied, the dynamic performance has a little difference. When one coil of servo valve is broken, the system works in going order. This result proves that redundance control greatly improves the reliability of the servo actuator system, and provide the theoretical bases for the design of the servo actuator system with good performance.