Asymmetrical thrust fully automatic compensation technology
Received date: 2017-05-25
Revised date: 2017-07-12
Online published: 2017-07-12
研究了一种适用于多发飞机的不对称推力完全自动补偿策略，并针对发动机失效后的不对称推力飞行特性进行研究。首先，推导了横航向达到平衡状态的条件，提出了一种基于发动机转子转速信号的自动补偿控制方法，在保证补偿效果的同时，解决了自动补偿系统可靠性低的问题，该自动补偿控制方法将高压转子转速信号与低压转子转速信号进行逻辑运算，结合高压转子转速差控制副翼和方向舵偏转，再与主飞行控制系统共同作用使飞机达到平衡状态。然后，基于横航向主飞行控制系统具有滚转角保持功能的特点，优化自动补偿控制系统。最后，全包线内建立飞机达到平衡状态的线性化数学模型，设计了不对称推力完全自动补偿控制律。通过MATLAB/Simulink建模并进行仿真验证，仿真结果表明完全自动补偿控制方法对不对称推力飞行具有良好的补偿效果。
赵海 , 姬云 , 李宏刚 . 不对称推力完全自动补偿技术[J]. 航空学报, 2017 , 38(S1) : 721526 -721526 . DOI: 10.7527/S1000-6893.2017.721526
A strategy for fully automatic asymmetrical thrust compensation for multi-engine aircraft is researched. The lateral-directional balanced conditions for the asymmetrical thrust flight are derived. An automatic compensation control method is proposed based on speed signals of the engine rotor. The method proposed not only ensures good compensation purpose, but also obviously increases reliability of the automatic compensation system. Logic operation of high pressure and low pressure rotor speed signals are conducted, and the differential high pressure rotor speed between symmetrical engines is used to modify the aileron and rudder response commands. The asymmetrical thrust flight is then compensated with the method proposed together with the primary flight control system. The automatic compensation control system is optimized based on the characteristic that lateral-directional primary flight control possesses roll angle hold function. A linear mathematical model for aircraft balanced conditions are developed for full envelop. Control law for fully automatic compensation of the asymmetrical thrust flight is obtained. Six degree of freedom aircraft nonlinear equations are modeled and simulated by MATLAB/Simulink. The simulation result shows that the method proposed can be used to achieve excellent compensation of asymmetrical thrust flight.
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