Sensor Fault Reconstruction Using Robustly Adaptive Unknown-Input Observers

Sensor Fault Reconstruction Using Robustly Adaptive Unknown-Input Observers

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Sensors are a key component in industrial automation systems.A fault or malfunction in sensors may degrade control system performance.An engineering system model is usually disturbed by input uncertainties, which brings a challenge for monitoring, diagnosis, and control.In this study, a novel estimation technique, called adaptive unknown-input observer, is proposed to simultaneously reconstruct sensor faults as well as system states.

Specifically, the unknown input observer is used to decouple partial disturbances, Samsung RZ32M7120WW Free Standing 315 Litres A+ Upright Freezer White the un-decoupled disturbances are attenuated by the optimization using linear matrix inequalities, and the Soccer - Goalie - Gloves adaptive technique is explored to track sensor faults.As a result, a robust reconstruction of the sensor fault as well as system states is then achieved.Furthermore, the proposed robustly adaptive fault reconstruction technique is extended to Lipschitz nonlinear systems subjected to sensor faults and unknown input uncertainties.Finally, the effectiveness of the algorithms is demonstrated using an aircraft system model and robotic arm and comparison studies.