What is it about?
Existing methods on state and fault estimation for non-infinitely observable descriptor systems have traditionally required the removal of some states (and treating them as unknown inputs or faults); this increases the number of unknown inputs/faults which could more easily render those methods infeasible. This paper proposes a scheme to circumvent that condition.
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Why is it important?
Through our proposed 2-observer scheme, we successfully eliminated the requirement of removing certain states (and treating them as faults/unknown inputs), and therefore avoided the increase in the number of unknown inputs (or faults) and increases the chances of the scheme being feasible. In addition, we showed that both observers can be designed independently and it will not affect the stability of the overall scheme; this is a very useful feature that eases the load of the designer.
Perspectives
Writing this article has been very satisfying for me, as I have discovered a way for fault and state estimation for non-infinitely observable descriptor systems without having to treat some states as faults (or unknown inputs).
Chee Pin Tan
Monash University
Read the Original
This page is a summary of: State and unknown input estimation for a class of infinitely unobservable descriptor systems using two observers in cascade, Journal of the Franklin Institute, December 2017, Elsevier,
DOI: 10.1016/j.jfranklin.2017.09.017.
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