Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4976131 | Journal of the Franklin Institute | 2007 | 18 Pages |
Abstract
In this paper two robust controllers for a multivariable vertical short take-off and landing (VSTOL) aircraft system are designed and compared. The aim of these controllers is to achieve robust stability margins and good performance in step response of the system. LQG/LTR method is a systematic design approach based on shaping and recovering open-loop singular values while mixed-sensitivity Hâ method is established by defining appropriate weighting functions to achieve good performance and robustness. Comparison of the two controllers show that LQG method requires rate feedback to increase damping of closed-loop system, while Hâ controller by only proper choose the weighting functions, meets the same performance for step response. Output robustness of both controllers is good but Hâ controller has poor input stability margin. The net controller order of Hâ is higher than the LQG/LTR method and the control effort of them is in the acceptable range.
Keywords
Related Topics
Physical Sciences and Engineering
Computer Science
Signal Processing
Authors
Jafar Zarei, Allahyar Montazeri, Mohmmad Reza Jahed Motlagh, Javad Poshtan,