Modeling, Simulation and Control of a Fly-by-wire Flight Control System Using Classical PID and Modified PI-D Controllers

Abstract

The Fly-By-Wire (FBW) system is a computer-based flight control system that replaces the mechanical link between the pilot's cockpit controls and the moving surfaces by much lighter electrical wires. This concept is applied in the electro-hydraulic servo systems. In the present work, a detailed non-linear mathematical model of an aircraft integrated servo actuator (ISA) is developed and a computer simulation program is built using MATLAB / SIMULINK package. The ISA mainly consists of two separate active hydraulic power systems, used to supply the ISA with the required power. The studied ISA incorporates two electro-hydraulic servo-valves, a twin-symmetrical-hydraulic actuating cylinder, and a smart design of built-in directional control valves with a feedback system. The output linear motion of the actuating cylinder of the ISA is presented and its transient response is analyzed. A classical PID and modified PI-D controllers are designed and tuned by Zeigler-Nichols method according to the Integral Square Error (ISE) criteria to minimize the difference between the obtained system output feedback and the desired set input by adjusting the system control parameters. The comparative study between the two types of controllers show that the modified PI-D controller has better response than basic one and slower in the presence of disturbance.

Performance comparison between variants PID controllers and unity feedback control system for the response of the angular position of the DC motor

“…Using the Z-N second method in the paper is to adjust the elements of PID controller. Put = ∞ and = 0 and substitute these values in the (8).…”

“…There are a lot of researches were achieved on the speed control of DC motors. Most of them used the PID controller to set the DC motor speed [3,8,9]. PID controller is combined from proportional (P), Integral (I), and derivative (D) controllers.…”

“…Therefore, it is named three terms controllers. When PID controller is used, the response will be good, reliable, and robust [8,[10][11][12]. The P controller of PID is used to decrease the disturbance effects on the system output.…”

“…The D part of the PID is connected with the feedback path. It is used to prevent the effectiveness of the set-point kick phenomenon [8,21] as shown in Figure 2. I-PD controller is rearrangement the connection of PID elements, also.…”

“…The authors of [2] used conventional proportional integral derivative, genetic algorithm, GA, to modify the PID elements, and a self-tuning fuzzy PID controller to regulate the speed of BLDC motor. The authors of [8] used conventional PID and PI-D control to control a fly-by-wire flight. The authors of [13] used PID controller with friction compensator to fix the exactly angular position of DC geared motor.…”