aero 371 lab 3

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Concordia University *

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371

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Mechanical Engineering

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Jan 9, 2024

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docx

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12

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AERO 371 T Modeling and Control Systems Experiment #6 Model, Analyze and Design Controller for the Pitch Dynamics of Airplane by Anas Senouci - 40132281 Concordia University Lab Section: BI-X Lab Instructor: Seyed Alireza Moezi Date Performed: April 7, 2022 Date Due: April 14, 2022 1
OBJECTIVES The objective of this laboratory is to observe the aircraft pitch dynamics using Simulink and MATLAB. It is needed to obtain the transfer function and its representation in the space. INTRODUCTION A total of six nonlinear coupled differential equations are needed to describe the motion of the aircraft. They can be decoupled and linearized into longitudinal and lateral equations. In this experiment, the pitch angle, the pitch rate, and the deflection angle are the variables that will be studied. PROCEDURE Figure 1: Forces and coordinates acting on the aircraft motion [1] It will be assumed that the aircraft is in steady cruise, at constant altitude and speed so the forces will balance each other. For this experiment, the input will be the elevator deflection angle ( ? ) and the output will be the pitch angle ( ? ) of the aircraft. Finally, the main equation that are going to be used are those following: 2
PROCEDURE For the first section which is the control system designer device for root locus of MATLAB, the first step is to input the MATLAB script found in Appendix I. The second step is to start with the control system designer app and generate plots as guided though the laboratory manual. To change the value of the controller, the compensator editor must be open. The last procedure of the first section would be to edit the design requirements like the settling time or overshoot by modifying the root locus characteristics. For the second section, the script found in Appendix II must be input. Next, the right compensator editor must be chosen to change the transfer function. The last part would be to use the optimization tool to get the most precise plots. RESULTS Figure 2: Responses when C = 1.5 3
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Figure 3: Responses when overshoot of 10% C = 1.6 Figure 4: Response with lead compensator method with overshoot of 10% 4
Question 1: Figure 5: Simulink subsystem block diagram for aircraft pitch Figure 6: Simulink system block diagram system for aircraft pitch 5
Figure 7: Open loop step response of aircraft pitch Figure 8: Simulink closed loop system block diagram system for aircraft pitch with unit feedback and unit control gain 6
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Figure 9: Closed loop step response of aircraft pitch Question 2: Figure 10: Simulink block diagram system with controller designed by root locus, C= 1.5 7
Figure 11: Closed loop step response of aircraft pitch with C = 1.5 Figure 12: Simulink system with controller designed by lead compensator, C= 1.6 x 8
Figure 13: Closed loop step response of aircraft pitch with lead compensator 9
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Question 3: 10
The open loops and closed loops responses of all the experiments obtained with the transfer function were the same as the ones obtained though the control system designer app. CONCLUSION To summarise, the experiment was a success because the lab's objectives were met, which included a basic understanding of the closed-loop and open loop functions leading to the pitch of an aircraft 11
REFERENCES [1] AERO 371 Laboratory Manual Winter 2022: Modeling and Control Systems. Department of Mechanical, Industrial and Aerospace Engineering. 12
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