1. 毕业设计（论文）的内容和要求

Aircraft and missiles are usually equipped with a control system to provide stability, disturbances rejection and reference signal tracking. The motion of an aircraft in free flight is extremely complicated. Generally, aircraft contains three transalation motions (vertical, horizontal and tranverse) and three rotational motion (pitch, yaw and roll) by controlling aileron, rudder and elevator. To reduce the complexity of analysis, the aircraft is usually assumed as a rigid body and aircraft#8217;s motion consist of a small deviation from its equalibrium flight condition. In addition, the control system of aircraft can be divided into two groups, namely longitudinal and lateral control. In longitudinal control, the elevator controls pitch or the longitudinal motion of aircraft system. The pitch of aircraft is control by elevator which usually situated at the rear of the airplane running parallel to the wing that houses the ailerons. Pitch control is a longitudinal problem, and the combination of nonlinear dynamics, modeling uncertainties and parameter variation in characterizing an aircraft and its operating environment are the one major problem of flight control system. This project is required to study the control strategies required to address the complex longitudinal dynamic characteristics of such aircraft. Requirements: 1. Read about 10 references regarding aircraft pitch control, then complete a reviewing report about the topic. 2. According to the longitudinal equations of motion for the aircraft, derive the transfer function of the aircraft system. 3. Based on the aircraft system model established by transfer function, design a PID controller to stabilize the system. 4. According to the longitudinal equations of motion for the aircraft, derive the state space model of the aircraft system. 5. In terms of the state space model, use a technique called the Linear Quadratic Regulator (LQR) method to generate the "best" gain matrix , without explicitly choosing to place the closed-loop poles in particular locations. 6. Write a graduation thesis including research background, system modelling, controller design, simulation results and conclusion.

2. 参考文献

1. Messner, W. C., Tilbury, D. M., Hill, A. P. R. (1999). Control Tutorials for MATLABreg; and Simulinkreg;. 2. Aircraft Pitch: System Modeling， http://ctms.engin.umich.edu/CTMS/index.php?example=AircraftPitch#167;ion=SystemModeling. 3. Aircraft Pitch: System Analysis, http://ctms.engin.umich.edu/CTMS/index.php?example=AircraftPitch#167;ion=SystemAnalysis. 4. Aircraft Pitch: Simulink Modeling, http://ctms.engin.umich.edu/CTMS/index.php?example=AircraftPitch#167;ion=SimulinkModeling. 5. Aircraft Pitch: Simulink Controller Design, http://ctms.engin.umich.edu/CTMS/index.php?example=AircraftPitch#167;ion=SimulinkControl. 6. Levant, A., Pridor, A., Gitizadeh, R., Yaesh, I., Ben-Asher, J. Z. (2000). Aircraft pitch control via second-order sliding technique. Journal of Guidance, Control, and Dynamics, 23(4), 586-594. 7. Ohri, J. (2014, December). GA tuned LQR and PID controller for aircraft pitch control. In Power Electronics (IICPE), 2014 IEEE 6th India International Conference on (pp. 1-6). IEEE. 8. Sudha, G., Deepa, S. N. (2016). Optimization for PID control parameters on pitch control of aircraft dynamics based on tuning methods. Applied Mathematics Information Sciences, 10(1), 343. 9. Wahid, N., Hassan, N. (2012, February). Self-tuning fuzzy PID controller design for aircraft pitch control. In Intelligent Systems, Modelling and Simulation (ISMS), 2012 Third International Conference on (pp. 19-24). IEEE.

3. 毕业设计（论文）进程安排

第 3～4周 (3-2至3-15)：Study the system modelling of aircraft system 第5～6周 (3-16至3-29)：Complete a reviewing report after reading about 10 references and submit the thesis proposal 第7周 (3-30至4-5)：Study how to use Matlab for control design and simulation 第8～9周 (4-6至4-19)：Establish the transfer function model and the state-space model of the aircraft system 第10～12周 (4-20至5-10)：Process inspection；design the PID controller and LQR controller 第13～15周 (5-11至5-31)：Simulate the designed controller to stabilize the aircraft system in Simulink/Matlab 第16～18周 (6-1至6-19)：Write the graduation thesis；give a presentation