"Cybernetics." . . . . . . . . "Neural Network-Based Sensor Validation for Turboshaft Engines"@en . . . . . . . . . . . . . . "Sensor failure detection, isolation, and accommodation using a neural network approach is described. An autoassociative neural network is configured to perform dimensionality reduction on the sensor measurement vector and provide estimated sensor values. The sensor validation scheme is applied in a simulation of the T700 turboshaft engine in closed loop operation. Performance is evaluated based on the ability to detect faults correctly and maintain stable and responsive engine operation. The set of sensor outputs used for engine control forms the network input vector. Analytical redundancy is verified by training networks of successively smaller bottleneck layer sizes. Training data generation and strategy are discussed. The engine maintained stable behavior in the presence of sensor hard failures. With proper selection of fault determination thresholds, stability was maintained in the presence of sensor soft failures."@en . . "Neural network-based sensor validation for turboshaft engines"@en . . . . . . . . "Feedback control." . . "Failure(mechanics)" . . "Preventive maintenance." . . "Turboshafts." . . "Jet and Gas Turbine Engines." . . "Fault tolerance." . . "Neural nets." . . "Turbine engines." . . "Multisensors." . . "Aircraft maintenance." . . . . "Engine control." . . "NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CENTER." . . "National aeronautics and space administration cleveland oh lewis research center." . "Turboshaft engines." . .