液压伺服作动系统力纷争敏感度及机理研究

Sensitivity and Mechanism for Force Fighting of Servo-Hydraulic Actuation System

液压伺服作动系统存在的力纷争问题会引起作动系统性能下降、飞机舵面结构疲劳,影响飞机安全。为解决上述问题,建立了考虑较完整电液伺服阀模型以及飞机舵面结构参数的并联作动系统数学模型,提出了对液压伺服作动系统力纷争关键敏感参数及形成机理的研究方法。将潜在影响力纷争的因素整合为控制器参数、电液伺服阀参数、作动系统结构参数、气动力参数四类,并研究了各类参数变化对力纷争的影响。结果表明,控制器参数和电液伺服阀参数是影响力纷争的关键因素,此外,通过对伺服阀位移、作动器位移/速率和力纷争之间作用关系和影响模式的研究,找到控制器差异和伺服阀差异形成力纷争的不同机理。分析结果对液压伺服作动器的设计及力纷争的解决提供了理论依据。

Force fighting among servo-hydraulic actuation systems may lead to performance decrase of the actuator and fatigue of the aerodynamic surface strutting, which can affect the safety of the aircraft. To solve the above problems, a mathematical model of parallel actuation system considering the complete electro-hydraulic servo valve model and the structural parameters of the aircraft＇s rudder surface is established, and methods to analyze the key sensitivity parameters and mechanism of hydraulic servo system are presented. Factors potentially influencing force fighting were integrated into four categories, including controller parameters, electro-hydraulic servo valve parameters, actuation system structural parameters and aerodynamic loads. The study of the influences of the above factors on force fighting indicates that the parameters of controller and electro-hydraulic servo valve were the key factors affecting force fighting. Furthermore, the influences of mechanism differences between the controller and the servo valve＇ s on loire fighting were found by studying the influence pattern of servo valve displacement and actuator displacement/rate on loire fighting. The results provide a theoretical basis for the design of hydraulic servo actuation system and the resolution of loire fighting.