University : University of Hertfordshire UniLearnO is not sponsored or endorsed by this college or university.
Subject Code : 6ENT1009
Assignment Task:

Task:

This Assignment assesses the following module Learning Outcomes (from Definitive Module Document):
 LO1: explore instrumentation techniques, standard control terminology and basic control strategies
 LO2: examine transducer selection criteria and operating principles and aero/auto/motorsport control applications;
 LO3: select appropriate transducers, actuators and instrumentation systems;
 LO5: setup open, feed forward and closed loop systems, tune PID controllers and simulate control systems using computers.
Assignment Brief:
The motion of an aircraft can be defined by a set of complex equations. The basic coordinate axes and forces acting on an aircraft are shown in the figure below:

 

 

figure1

Figure 1 - Basic Co-Ordinate Axes and forces on an aircraft

The following assumptions can be made:
? The aircraft is in a steady cruise at a constant altitude and velocity. As such, thrust, drag, weight and lift balance each other out.
? A change in pitch angle will not change the speed of the aircraft under any circumstance
As such, the OPEN Loop Transfer Function, defining the pitch motion of the aircraft, can be seen below:

P(s) =θ(s)δ(s)=1.151s + 0.1774s3 + 0.739s2 + 0.921s
Equation 1 - Transfer function of Aircraft Lateral Dynamics

Using MATLAB and Simulink, you will be required to identify and comment on the behavior of the CLOSED loop pitch response of the aircraft. This will be achieved by conducting the Closed Loop Step Response and Open Loop Nyquist Plot and, based on your understanding of control systems, comment on the stability of the Closed Loop system.

Following this, the aircraft will be required to achieve the following characteristics:
 Overshoot less than 10%
 Settling time less than 10 seconds
 Steady-state error less than 2%
Implement either a P, PI or PID controller to the pitch response in order to achieve the above characteristic requirements, displaying the Closed Loop step response in your report and critically analysing the suitability of the chosen controller.

You will also need to link in instrumentation panels from Simulink to show how the pilot would see these responses in real-time and comment on these in the report. In addition, comment on the type of sensors that would be used in the aircraft in order to determine whether the altitude of the aircraft had been reached. Finally, with the chosen controller implemented, produce a Nyquist Plot and, based on your understanding of control systems, comment on the stability of the system.

 

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  • Uploaded By : Pearl
  • Posted on : December 09th, 2018

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