Abstract
This chapter presents applications of second order sliding mode observer schemes to three different aerospace problems. Two relate to ADDSAFE aircraft fault detection benchmark problems. Firstly, the detection and isolation problem associated with an actuator jam/runaway is considered and secondly an actuator oscillatory failure case is tackled. For the actuator jam/runaway scenario the actuator deflection becomes decoupled from the demand issued from the flight control computer and either remains fixed at some uncommanded point or ‘runs away’ to an extreme value. For the OFC problem, the reconstruction scheme requires an estimate of rod speed provided by a second order sliding mode observer. Ideally low gains in the observer are required because of the noisy environment associated with the physical system. An adaption scheme is therefore required to retain sliding in the presence of severe faults. A problem associated with fault detection in a formation flying scenario, associated with satellites is also discussed. This application to a relative degree two problem would be difficult to solve using linear observer methods.
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Edwards, C., Alwi, H., Menon, P.P. (2013). Applications of Sliding Observers for FDI in Aerospace Systems. In: Bandyopadhyay, B., Janardhanan, S., Spurgeon, S. (eds) Advances in Sliding Mode Control. Lecture Notes in Control and Information Sciences, vol 440. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-36986-5_17
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