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Despite their low probability, faults and failures can occur in aircraft for various internal or external mechanisms. The control surfaces of an aircraft can become faulty due to various reasons; they can either become permanently jammed (due to hydraulic or mechanical problems) or temporarily stuck (due to blow-down limits). A blow-down limit is a phenomenon where the actuator surface become stuck...
This paper describes the development and evaluation of sliding mode schemes to handle actuator and sensor faults for the RECONFIGURE benchmark problem. For the actuator fault problem, a linear parameter varying (LPV) sliding mode control allocation scheme has been developed. The scheme is retro-fitted to the existing baseline controller. When faults/failures are present in an elevator, the LPV sliding...
This paper describes the application of a linear parameter-varying integral sliding mode control allocation scheme to the RECONFIGURE benchmark model to deal with an elevator failure/fault scenario. The proposed scheme has the capability to maintain the closed-loop nominal load factor control performance in the face of elevator failures/faults, by effectively redistributing a retro-fitted signal to...
In this paper a sliding mode observer is proposed to detect and reconstruct load alteration failures in a power network. The power network, specifically a 9-bus IEEE benchmark model, is modelled as a semi-explicit class of differential algebraic equations (DAEs). Only the phase angle of the generators, a subset of the differential states of the DAE, are assumed to be measured. The objective is to...
A method has recently been proposed which uses a particular sliding mode observer to reconstruct faults. The method essentially analyses the equivalent output error injection signal required to maintain the observer in a sliding motion. This paper considers the application of the method to a recently proposed ship propulsion benchmark problem. The observer design is performed using a linearisation...
This paper presents the results from a novel FTC scheme designed for one of the RECONFIGURE benchmark problems. The scheme retro-fits an integral sliding mode control allocation scheme to the existing controller to achieve robustness and tolerance against faults/failures, in order to maintain nominal load factor tracking performance as well as the angle of attack protection. The scheme takes into...
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