FDIR

Failure Detection, Identification, and Recovery

A process used in systems engineering to detect faults, identify their cause, and recover from failures to maintain system functionality.

Key Components of FDIR

1. Fault Detection: Identifying when a fault occurs, such as a sensor failure or component malfunction.
2. Fault Isolation: Diagnosing the specific nature and location of the detected fault.
3. Recovery: Implementing measures to mitigate the fault’s effect and restore system functionality.

Applications

• Aerospace: Crucial for aircraft and spacecraft systems
• On-orbit systems: Essential where maintenance is impossible or highly limited
• Electric power systems: Used for fault management in power grids
• Control systems: Ensures robustness in various industrial applications

Implementation Techniques

• Built-in Test (BIT): Incorporates self-testing capabilities within the system
• Model-Based Fault Detection: Uses simplified system models to compare against real-time behavior
• Redundancy: Employs multiple identical components for comparison and backup
• Centralized vs. Decentralized Architectures: Different approaches to implementing FDIR logic

FDIR is crucial for maintaining system availability, reducing downtime, and ensuring safe operation, especially in critical applications where immediate human intervention is not possible.