Quantitative multivariable feedback design for a turbofan engine with forward path decoupling
✍ Scribed by Edward Boje; Osita D. I. Nwokah
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 440 KB
- Volume
- 9
- Category
- Article
- ISSN
- 1049-8923
No coin nor oath required. For personal study only.
✦ Synopsis
A detailed quantitative feedback design example of robust control of a multivariable turbofan engine is presented. The Perron root of the so-called interaction matrix is used as a measure of the level of triangularization of uncertain multivariable plants. This leads to a design approach where a decoupling pre-compensator is used to reduce the level of interaction between loops before quantitative design of a diagonal feedback controller matrix is attempted. If the interaction index can be made less than unity by the design, stability of the diagonal loop designs guarantees stability of the closed-loop multivariable system. The decoupling pre-compensator is designed to be in the forward path, between the diagonal controller and the plant. For the design example presented, a simple, static pre-compensator reduces interaction in the critical gain crossover frequency range. Careful design of the diagonal controller and pre-"lter result in an improved, lower-order design than has been obtained previously using the quantitative Nyquist array approach.