CAD OF THE HOROWITZ/SIDI-DESIGN FOR FEEDBACK SYSTEMS WITH LARGE PLANT PARAMETER UNCERTAINTY

1983 ◽  
pp. 681-687 ◽  
Author(s):  
A. Gräser ◽  
W. Neddermeyer ◽  
H. Tolle
Keyword(s):  
Parameter Uncertainty ◽  
Feedback Systems ◽  
Large Plant ◽  
Plant Parameter

On the Robust Regulator for Linear Systems With Limited Parameter Uncertainty

1999 ◽  
Vol 123 (2) ◽  
pp. 248-252
Author(s):  
Jie Huang
Keyword(s):  
Linear Systems ◽  
Parameter Uncertainty ◽  
The Other ◽  
Minimal Order ◽  
Plant Parameter

The linear servomechanism problem has been studied for two extreme cases. On one extreme, the problem has been studied without considering the plant parameter uncertainty. On the other extreme, the problem has been studied for the worst parameter uncertainty in the sense that all the plant parameters are allowed to vary arbitrarily in the neighborhoods of their nominal values. Between these two extreme cases is what will be called limited uncertainty case where the entries of the plant matrices vary functionally with respect to some variables. This case will be studied in this paper. The main result is that, in the limited uncertainty case, the order of the robust regulator can be strictly less than the minimal order of the robust regulator with respect to the worst parameter uncertainty.

Feedforward Controllers and Tracking Accuracy in the Presence of Plant Uncertainties

1995 ◽  
Vol 117 (4) ◽  
pp. 490-495 ◽  
Author(s):  
Yongdong Zhao ◽  
Suhada Jayasuriya
Keyword(s):  
Steady State ◽  
Frequency Domain ◽  
Parameter Uncertainty ◽  
Feedback Loop ◽  
Tracking Error ◽  
Tracking Accuracy ◽  
Plant Parameter

In the absence of plant parameter uncertainty feedforward controllers can be synthesized to achieve perfect continuous tracking. When plant has uncertainties it is, in general, impossible to achieve such perfect tracking. Investigated in this paper is the role played by feedforward controllers in the presence of plant uncertainties. We show that the use of feedforward controllers cannot improve the tracking error beyond what is achievable with a properly designed feedback loop, over all plant uncertainties. Including preview in the feedforward will not alter the situation either. We present two methods of designing robust compensators so that the tracking error due to uncertainties will be made small in some sense in the frequency domain and will have zero error in the steady state.

Sign in / Sign up

Export Citation Format

Share Document