Adaptive Monitoring and Accommodation of Nonlinear Actuator Faults in Positive Real Infinite Dimensional Systems

We consider a class of positive real infinite dimensional systems which are subjected to incipient actuator faults. The actuator fault is modeled as a time varying transition from an initial (linear or even nonlinear) map into another unknown nonlinear map at the onset of the fault occurrence. An in...

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Bibliographic Details
Published in:IEEE transactions on automatic control 2007-12, Vol.52 (12), p.2332-2338
Main Authors: Demetriou, M.A., Ito, K., Smith, R.C.
Format: Article
Language:English
Subjects:
Accommodation
Actuator faults
Actuators
Adaptive signal detection
Applied sciences
Automatic control
Computer science
control theory
systems
Control theory. Systems
distributed parameter systems
Exact sciences and technology
fault accommodation
Fault detection
Faults
Hydraulic actuators
Indium tin oxide
Inverse
Modelling and identification
Monitoring
nonlinear actuator dynamics
Nonlinear dynamical systems
Nonlinearity
Observers
Reconfiguration
Robustness
Signal generators
Stability
System theory
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Summary:We consider a class of positive real infinite dimensional systems which are subjected to incipient actuator faults. The actuator fault is modeled as a time varying transition from an initial (linear or even nonlinear) map into another unknown nonlinear map at the onset of the fault occurrence. An infinite dimensional adaptive detection observer is utilized to generate a residual signal in order to detect the fault occurrence and to assist in the fault accommodation. This is done via an automated control reconfiguration which utilizes information on the new actuator map and adjusts the controller via a right inverse of the new actuator map. A robust modification is utilized in order to avoid false alarms caused by unmodeled dynamics. An example is included to illustrate the applicability of the proposed detection scheme.
ISSN:0018-9286
1558-2523
DOI:10.1109/TAC.2007.910694