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In a typical quadruplex actuator system, how is the failure of an actuator identified?

In a typical quadruplex actuator system, how is the failure of an actuator identified? Correct Answer By comparing it with the signal of the three good ones

A typical quadruplex system uses signal processing based FDI( Fault Detection and Isolation) system. It identifies the failed actuator by comparing its control signal with the other three good ones. A model-based FDI system is generally used in triplex architecture.

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