Control systems for magnetic suspensions and other applications

2014-02-04T15:04:07Z (GMT) by Roger M. Goodall
The thesis consists of twelve papers which present work on two distinct but related topics concerning high performance control systems: firstly the design of controllers for electromagnetically suspended vehicles, and secondly methods for efficient design of digital controllers for this and other applications. The first topic is covered by seven papers which range from consideration of the underlying theory through to the specific design of the suspension control system for British Rail's experimental vehicle, also applied to the world's first commercial Maglev system at Birmingham Airport. Not only are the control engineering considerations described, but also the dynamic requirements of providing an adequate ride quality using the electro-magnets alone are addressed in some detail. The remaining five papers consider the problems of translating compensator transfer functions such as phase advances, lagleads, "notch"filters etc. for implementation on microprocessor systems. They introduce a practical method for appraising coefficient sensitivity, which leads on to a novel structure for recursive digital filters using the so-called 0 operator rather than the traditional z operator. Detailed implementation is considered from the point of view of hardware and software, but making use of the new structure which is designed to minimise computation requirements. Specific examples for the digital cont roller methodology are drawn 'from the Maglev control application.