Abstract

This report outlines the full work on the final year project. The project’s title is ‘CAD for robust control using the QFT design method ’. The aim of the project is to develop software tools, suitable for the robust control design of highly uncertain SISO systems. The design of these systems is based on I Horowitz’ s QFT method. This is a frequency domain loop-shaping design technique, which is fully described in Chapter 2. The report is a step-by-step guide to the design. It includes an
introduction to control and robust systems, an explanation of the QFT method, and the problem definition of the design using an illustrative example. It continues with designs of phase lead and lag compensators via graphical techniques. Next the application of optimisation methods for the design of optimal PD and PID controllers is discussed. Designing an appropriate pre-filter completes the design procedure. Finally, a number of simulations show that the design technique
was successful and meets the given specifications. The report concludes with a summary of the project work and its results and suggests future directions, which can be followed in order to improve certain aspects of the design. The Appendix summarises aspects of the theories used for the purposes of the project and a list of Matlab files created and used.