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针对飞机控制系统执行机构具有非线性这一特点,选用某歼击机作为研究对象,分析各类非线性环节对飞机纵向短周期特性的影响。首先分析了死区、间隙和速率饱和等非线性环节的基本特性,建立了相应的包含非线性环节的飞行动力学模型,然后,基于Chalk准则计算不同非线性参数下的飞行品质指标,进行飞行品质评价。通过对不同飞控系统构型的对比研究,探讨了执行机构非线性对飞行品质的影响。研究结果表明,各非线性环节都将对系统的快速性产生不利影响,使系统有效上升时间增加,相位延迟增加。其中,间隙还会造成系统阻尼减小,可导致系统不稳并出现极限环振荡。
Aiming at the non-linearity of the aircraft control system actuator, a fighter plane was selected as the research object to analyze the influence of various non-linear links on the longitudinal short-cycle characteristics of the aircraft. Firstly, the basic characteristics of the nonlinear links such as dead zone, clearance and rate saturation are analyzed, and corresponding flight dynamics models including nonlinear links are established. Then, the flight quality indexes under different nonlinear parameters are calculated based on the Chalk criterion. Quality evaluation. By comparing the different flight control system configuration, the influence of actuator nonlinearity on flight quality is discussed. The results show that all the nonlinear factors will have an adverse effect on the rapidity of the system, increasing the system effective rise time and increasing the phase delay. Among them, the gap will also cause the system damping decreases, can lead to system instability and limit ring oscillation.