The control stabilization system is a flight control system that can improve the stability of the aircraft and improve the controllability of the aircraft. The stability of the aircraft is determined by the aerodynamic layout. The stability and maneuverability of modern high-speed aircraft are contradictory. The mechanism of the control system is applied, and the closed-change control system formed by the angular velocity of the aircraft and the overload signal is introduced to improve the stability of the aircraft; The feedforward command compound control was introduced to improve the maneuverability of the aircraft.
The control augmentation system is a flight control system that can improve the stability of the aircraft and improve the control system. The stability of the aircraft is determined by the aerodynamic layout. The stability and maneuverability of modern high-speed aircraft are at odds with each other. The mechanism of the control system is applied, and the angular velocity and overload signals of the aircraft are introduced to form a closed-loop control to improve the stability of the aircraft; the feedforward command compound control is introduced to improve the maneuverability of the aircraft. Control stabilization system is the basis of fly-by-wire system, which has been widely used in modern flight control system.
Control Parameter
Selection of main gain factor
The increase of the gain coefficient K as the main channel can improve the anti-interference ability of the aircraft, and at the same time improve the aircraft's ability to respond to the pilot's command. However, the increase of K makes the short-cycle frequency increase faster, and if K is too large, the system will appear a divergent trend. Therefore, K should not be too large.
Selection of feedback parameters
The influence of the feedback parameter N in this paper is based on the fact that another feedback parameter remains unchanged. Therefore, increasing N has a greater effect on improving the short-cycle frequency of the aircraft, and can also improve the effect of the stick force on the overload gradient and the overload gradient in maneuvering flight. Rod displacement versus overload gradient, improving the aircraft's ability to respond to pilot commands.
Selection of Feedforward Amplification Factor
Setting the feedforward amplification factor is specially designed to improve the maneuverability of the aircraft, which is equivalent to the control link in the system. Selecting a larger M has a good effect on improving the gradient of the aircraft's rod force to overload and rod displacement to overload, and improving the aircraft's ability to respond to the pilot's command. However, a larger M will increase the high-frequency oscillation component of the system, which is an unfavorable factor for flight quality.
Advantage
1. It can better solve the contradiction between the stability and maneuverability of the aircraft, and overcome all the shortcomings of the stability augmentation control system.
2. It can realize any static and dynamic relationship between the stick command and the aircraft response, as well as any starting force requirement of the control stick.
3. The mechanical rod system in this system can be designed to be simpler, as long as the flight safety is ensured.
4. Since the pilot's control signal can be transmitted to the rudder surface through two channels. This provides flexibility in manipulating signal distribution in system design and tuning. Considering the characteristics of the ideal control system, the characteristics of the control system can be easily changed by simply changing the gain and time constant of the electrical components without depending on the characteristics of the mechanical lever system itself.
5. Provides reliability for improving aircraft maneuverability, relaxing static stability requirements, and designing new high-performance aircraft
