一种电液伺服作动器在主-主工作模式下的力纷争振荡均衡方法  

A Mitigation Method for the Electronic Hydraulic Servo Actuators Force Fight Oscillation of in Active-Active Mode

作　　者：薛瀛[1] XUE Ying(Shanghai Aircraft Design and Research Institute,Shanghai,200210,China)

机构地区：[1]上海飞机设计研究院,上海200210

出　　处：《机械设计与研究》2021年第5期53-58,67,共7页Machine Design And Research

基　　金：国家工信部重点资助科研项目(GX2017012)。

摘　　要：针对电传飞控系统舵面电液伺服作动器采用主-主工作模式带来的力纷争振荡,导致舵面疲劳,影响飞行安全的问题,提出了一种基于压力和位置双重反馈补偿的力纷争均衡控制方法。该方法通过对舵面两端的两个作动器收缩腔和伸出腔压差的比较生成压力补偿值;采用比例积分控制器,根据两个作动器之间的压力差与舵面扭转变形的比例关系将压力转化成位置进行补偿;利用积分控制对高比例增益出现的振荡和超调进行修正,消除稳态误差。再通过舵面两端的两个作动器位置传感器测得的实际位置进行比较,生成位置修正值,用来均衡两侧作动器的位置差,减少舵面两个作动器之间的方位误差,实现力纷争均衡。建立了作动器-舵面的数学模型,对均衡控制中的比例积分控制增益进行了仿真。通过物理试验平台(铁鸟)对力纷争均衡控制进行了验证,试验结果表明,力纷争均衡控制将两个作动器之间的压差从400 Psi降至190 Psi,降低了52%,均衡方法可有效降低力纷争。A mitigation control method is proposed based on the dual feedback compensation of pressure and position to solve the force fight oscillation caused by the active-active working mode between redundancy electronic hydraulic servo actuators(EHSAs),resulting in airfoil fatigue affecting the flight safety.The controller compares the pressure difference between the two actuators based on the pressure of retract and extend ram to generate pressure compensation value.Through the PI controller,the position compensation value is calculated according to the relationship between different delta pressure(DDP)and the proportion of the airfoil torsional deformation,while the integral control is used to eliminate the steady-state error of oscillation and overshoots that accompanies high gain control.The position is corrected by comparing the position sensors of two actuators at both ends of the airfoil to minimize the difference and reduce the azimuth error between the two actuators,realizing the force fight mitigation.A mathematical model of actuator-airfoil is established to simulate the gain of proportional integral in mitigation controller.The control method is further verified by the special Iron Bird tests with the result that the DDP is decreased from 400 psi to 190 psi at a decreasing rate of 52%when mitigation is induced,meeting the design requirement of the structural fatigue damage tolerance of 500 psi.

关 键 词：力纷争 作动器 电传 飞控系统 均衡 补偿 

分 类 号：V249[航空宇航科学与技术—飞行器设计]