Fault Isolation of Aeroengine Speed Decreasing Signal Based on Parallel Multiple Robust Observers

Through researching of the mechanism causing engine speed decreasing signal,a method of fault isolation for certain turbofan aeroengine based on parallel multiple robust observers was proposed.Normal condition and four fault modes for the actual system were established.Then the method was applied to fault detection and isolation of the aeroengine sensors that cause the speed decreasing signal.Results of numerical simulation and error analysis show that this method is highly reliable and highly accurate in fault isolation.