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Identification of Aging Aircraft Electrical Wiring

Identification of Aging Aircraft Electrical Wiring. Group Members: David Bryant Yuto Shinagawa Shaun Steinbarger. Sponsors: Dr. R. O. Stearman Marcus Kruger. BSS Engineering Inc. Overview. Background Information Project Objectives Experimental Setup Problems Encountered

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Identification of Aging Aircraft Electrical Wiring

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  1. Identification of Aging Aircraft Electrical Wiring Group Members: David Bryant Yuto Shinagawa Shaun Steinbarger Sponsors: Dr. R. O. Stearman Marcus Kruger BSS Engineering Inc.

  2. Overview • Background Information • Project Objectives • Experimental Setup • Problems Encountered • Laboratory Aging Results • Age Analysis Results • Recommendations • Conclusion

  3. Background Information • Navy and Air Force discover problem in the 1980s • Commercial aviation industry becomes concerned • Swiss Air 111 and TWA 800 • Substantial number of planes contain faulty wiring • Aircraft industry is seeking a method to discern age of aircraft wire

  4. Triboelectric Effect Definition: creation of charge imbalance due to contact separation resulting in unwanted interference

  5. Triboelectric Effect Solution to the problem: relate triboelectric effect to the age of a wire in hopes of identifying faulty wiring

  6. Project Objectives • Find standards in wire aging techniques • Design laboratory experiments • Successfully simulate wire aging • Monitor the triboelectric response of nominal and aged wires

  7. Distribution of Tasks Project Manager: Shaun Steinbarger Senior Engineer: David Bryant Senior Engineer: Yuto Shinagawa Wire Aging Chief Engineers: David Bryant Shaun Steinbarger 1. Logistics 2. Design 3. Implementation Age Analysis Chief Engineer: Yuto Shinagawa 1. Test Design 2. Test Implementation 3. Data Analysis

  8. Alpha Wire 1632 • Material – rubber • 20 Gage • 1.02 mm insulation thickness • 3.18 mm diameter • Single Conductor • Temperature Range • -30°C ~ 90°C • Cost • Twisted pair

  9. Laboratory Aging • CE Environmental Chambers • Heat Test • Humidity Test • Chemical Solution Test • Saltwater • Jet-A fuel with Prist additive • 15 specimens per test – 4 ft/specimen • Specimen removed every 3½ days

  10. Heat & Humidity Tests • Temperature – 120°F • Humidity – 70% • Temperature – 75°F

  11. Chemical Solution Test • Salt Water • Salinity – 8 fl. oz./gallon • Jet-A Fuel • Approved 5 gallon container • Ambient temperature - 100°F

  12. Signal Analyzer Amplifier Shaker WireCircuit Age Analysis I Data Acquisition System

  13. Data Acquisition System Amplifier Age Analysis II Signal Analyzer

  14. Age Analysis III Wire Circuit (closed) Electromagnetic Shaker

  15. Problems Encountered – Laboratory Aging • Heat Test • Desired Temperature 170°F • Heat Lamp • Testing terminated early

  16. Problems Encountered II – Age Analysis • Software Packages • Hewlett Packard 35660A • Ideas • LabView • HP3566A/67A • Three Separate Test Runs • Closed Loop Test • Electromagnetic Interference (EMF) • Inconsistent results

  17. Results I – Laboratory Aging • Humidity/Heat aging tests • No visual/physical results • Jet-A • Expanded in diameter and length • “Slippery” copper wire • Salt H2O • Corrosion of copper

  18. Results II- Age Analysis • No trends in data • Inconsistent • results

  19. Project Objectives • Find standards in wire aging techniques • Design laboratory experiments • Successfully simulate wire aging • Monitor the triboelectric response of nominal and aged wires • Success • Success • Success • Unsuccessful

  20. Recommendations I • Laboratory Aging • Reconfigure Heat Test • Locate an environmental chamber capable of 170°F • Expose wire to extreme cycles in temperature • Discontinue Humidity Test • Expose specimens to combinations of tests • Cycle procedure • 1 week Jet-A • 1 week Salt H2O • 1 week Heat

  21. Recommendations II • Age Analysis • Become proficient with Ideas • Eliminate all outside variables • Develop more consistent testing procedures

  22. Conclusions • Inconsistent results • Data does not provide any definitive trends between age and triboelectric response • Current experimental setup does not guarantee elimination of external disturbances • Change in scope of project • Find a relationship between the aged state • of a wire and its triboelectric response • Design and evaluate experimental procedures • so future groups may base their continuing • research upon them

  23. Any Questions ???

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