Abstract
In a real-time control system where the control input is computed by a controller computer, the transient computer failures caused by an electromagnetic interference may seriously affect system stability. The faulty controller computer causes either a long delay in the feedback loop thus failing to update the control input for one or more sampling intervals, or control input disturbances by updating the control input incorrectly until the fault is handled properly. If the period of this abnormal behavior exceeds a certain limit called a hard deadline, either the necessary conditions for system stability will be violated or the system will leave the allowed state space. In such a case a dynamic failure is said to occur in the system.
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