Aims

The aims of the course are to:

• Develop an understanding of the dynamics of an aircraft in flight, and an appreciation of how their characteristics may be improved using automatic control systems.

Objectives

As specific objectives, by the end of the course students should be able to:

• Appreciate how the equations of motion for an aircraft follow from Newton's second law, and how they may be simplified to the small-disturbance form;
• Understand how the free modes of motion follow from the equations of motion, and be aware of the approximate derivations of the modes;
• Know the factors determining the static stability of an aircraft, and understand the significance of the position of the centre of gravity;
• Have a knowledge of basic control strategies for autopilots, and their effects on aircraft stability;
• Appreciate that the dynamic characteristics of the aircraft may be improved by feedback control, and understand how this concept applies to stability augmentation systems, and command augmentation systems.

Content

The flight test part of this module has a number limit. If it is oversubscribed, selection will be made on a competitive basis, subject to priority being given to students in Engineering Areas 3 (Aerospace and Aerothermal Engineering) and 8 (Instrumentation and Control). The module can be taken without participating in the flight tests.

Please also note that the first 4A4 lecture will be a briefing session only (lectures start in week 5).  Attendance at the briefing session is essential; if you are forced to miss it, contact the course leader by the end of week 1 at the latest.

Aircraft Stability (8L, Michaelmas term, Dr W.R. Graham)

• Aircraft equations of motion, small disturbance form, stability derivatives.
• Longitudinal motion: phugoid mode, short period oscillation and approximate forms.
• Lateral motion: roll subsidence, dutch roll, spiral mode and approximate forms.
• Static stability of aircraft: longitudinal stability, directional stability, lateral stability.

Automatic Control Systems (6L, Lent term, Dr M. Vera Morales)

• Root locus plots and their use in designing feedback control systems.
• Response to control inputs.
• Autopilots: pitch and roll angle control, effect on aircraft dynamic response and stability.
• Stability augmentation systems: pitch rate SAS & yaw damper as means of improving dynamic stability characteristics, relaxed static stability.
• Command augmentation systems: C-star criterion as basis for longitudinal CAS in fly-by-wire aircraft.

This syllabus contributes to the following areas of the UK-SPEC standard:

Toggle display of UK-SPEC areas.

 
Last modified: 31/05/2024 09:57