A sliding mode observer based FDI scheme for the ship benchmark

A method has recently been proposed which uses a particular sliding mode observer to reconstruct faults by analysing 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 benchmark problem. The observer design is performed using a linearisation of a single engine single propeller system. Nonlinear simulation tests are carried out using a limit test sequence applied to a two engine two propeller system. Appropriate analysis of the observer output is shown to Yield estimates of the faults with no false alarms or missed detections. The results obtained are compared with those already reported in the literature using alternative observer based approaches.