飞机舵面作动系统动压反馈特性分析

Analysis of Dynamic Pressure Feedback Characteristics of Aircraft Control Surface Actuation System

电液伺服作动系统是飞控系统的关键子系统,在实际工作中,存在作动系统与飞机舵面结构谐振的问题。为了研究飞机电液伺服作动系统稳定性的问题,建立了完整准确的伺服系统数学模型。在不降低系统性能的前提下,提出利用高通滤波即动压反馈的控制算法来提高伺服系统稳定性的方法。对动压反馈的补偿作用和原理进行介绍,对加入动压反馈后的系统进行数学建模,并对系统阶跃特性和频率特性进行仿真验证,结果证明动压反馈的引入没有降低系统性能,且在综合谐振处提高了系统阻尼,较好地解决了谐振问题,起到了增稳效果。电液伺服作动系统动压反馈技术的初步研究,对后续型号设计有较大应用价值。

The key subsystem of the electro-hydraulic servo actuation system has the problem of resonance between the actuation system and the aircraft control surface structure in practical work.In order to study the stability of aircraft electro-hydraulic servo actuation systems,a complete and accurate mathematical model of the servo system is established.A method of using dynamic pressure feedback control algorithm to improve servo stability is proposed without reducing performance.A compensation effect and principle of dynamic pressure feedback is introduced,models the system with dynamic pressure feedback,and verifies the step and frequency characteristics of the system through simulation.The results show that the introduction of dynamic pressure feedback does not reduce system performance,and improves system damping at structural resonance,effectively solving the resonance problem and achieving stability enhancement.The preliminary research on the dynamic pressure feedback technology of the electro-hydraulic servo actuation system,has great application value for subsequent model design.