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Title: Frequency domain approach to computing loop phase margins of multivariable systems
Authors: Ye, Z.
Wang, Q.-G. 
Hang, C.C. 
Issue Date: 2-Jul-2008
Source: Ye, Z., Wang, Q.-G., Hang, C.C. (2008-07-02). Frequency domain approach to computing loop phase margins of multivariable systems. Industrial and Engineering Chemistry Research 47 (13) : 4418-4424. ScholarBank@NUS Repository.
Abstract: The loop phase margins of multivariable control systems are defined as the allowable individual loop phase perturbations within which stability of the closed-loop system is guaranteed. This paper presents a frequency domain approach to accurately computing these phase margins for multivariable systems. With the help of unitary mapping between two complex vector space, the MIMO phase margin problem is converted using the Nyquist stability analysis to the problem of some simple constrained optimization, which is then solved numerically with the Lagrange multiplier and Newton-Raphson iteration algorithm. The proposed approach can provide exact margins and thus improves the linear matrix inequalities (LMI) results reported before, which could be conservative. © 2008 American Chemical Society.
Source Title: Industrial and Engineering Chemistry Research
ISSN: 08885885
DOI: 10.1021/ie701693j
Appears in Collections:Staff Publications

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