Downloaded from https://www.everyspec.com ADS-79D-HDBK Lab test stand on-site test and measure desk-top off-side processing: Analyse data Performs Required Maintenance • Electrical Operational Parameter • Vibration, Heat, Moisture • Power Quality • ... • Electrical system health monitor: Determine optimal sensor suite and gather data in test scenario • signal processing and fault feature extraction • Fault classification • Update Maintenance Plans based upon findings System/Signal Processing Diagnostics/Prognostics Maintenance FIGURE H-2: Diagnostic using BIT tests and embedded sensor. Steps to implement are: 1. Study the failure on lab test stand to establish baseline database.
Applying environmental and usage parameters to the electronic module in a lab setting to determine which parameters drive component failure. (electrical failure plus temperature, vibration and humidity stress data) 2. Integrate the electrical system health monitoring: Based upon lab findings, develop sensor suite to capture data for analysis. 3. When failure detected, perform signal processing, fault feature extraction and fault classification. 4. Perform Maintenance: Based upon lab data, update maintenance procedures. Any system created to mitigate testing and inspections should be at least as reliable as the legacy test.
The system should demonstrate a reliability level greater than the current testing process. H.3.5 Environmental and Operational Monitoring H.3.5.1 Baseline Usage Condition. Health monitoring and identifying a baseline usage condition to evaluate system health are fundamental for Diagnostics/prognostics. The challenge here is developing an efficient ―training‖ program for the algorithms to define healthy conditions. Another challenge is identifying what usage and environmental conditions to consider for the baseline. For environmental monitoring, autonomous tags that utilize RFID and programmable sensor kits offer a noninvasive solution.
These tag devices could host a range of environmental monitors for contamination, corrosion, electrical degradation, and so on. Further research is needed to develop tags for prognostics. H.3.5.2 Operational Environmental Load and Usage Condition. Environmental and operational monitoring could also be considered in the development of environmentally tolerant electronics. Environmental and usage conditions obtained in field trials could be fed into design tools to simulate whether future devices and design can withstand these conditions. Simulation techniques, tools, and autonomous sensors are all areas of opportunity for research and development.
Currently the BIT is primarily used for diagnostic purposes only. However, there are opportunities to capture the CBIT data while in flight, interface with the embedded health monitoring 142