To this end, two stages have been examined in the context of decision making; the fault detection and identification (FDI) stage and the reconfiguration stage (RC).
The proposed method consists of a fault detector for robust and quick fault detection, a two-stage hierarchical isolation strategy for fault isolation, and an online control allocation unit scheduled by the isolation scheme for fault tolerance.
Design procedure incorporates sensor cost, fault detectability and fault detection rate in the design formulation.
The automated diagnostic system comprises three stages: fault detection, fault localization and fault severity identification.
In the last stage, the fault detection and localization are performed by the microcontroller.
Only the normal control operation and fault detection situations are considered at this stage of the study.
The fault detection algorithm can detect the presence of a fault within one power cycle.
The fault detection algorithm can efficiently detect both soft and hard faults in current sensors, and the fault-tolerant control system can effectively tolerate both types of faults.
Once the fault is detected by the Fault Detection and Isolation (FDI) unit, a fault compensation loop is activated.
However, the complex and non-stationary vibration signals with a large amount of noise make the fault detection to be challenging, especially at the early stage.
