Spiral Bevel Pinion Crack Detection in a Helicopter Gearbox

Abstract

The vibration resulting from a cracked spiral bevel pinion was recorded and analyzed using existing Health and Usage Monitoring System (HUMS) techniques. A tooth on the input pinion to a Bell OH-58 main rotor gearbox was notched and run for an extended period at severe over-torque condition to facilitate a tooth fracture. Thirteen vibration-based diagnostic metrics were calculated throughout the run. After 101.41 hours of run time, some of the metrics indicated damage. At that point a visual inspection did not reveal any damage. The pinion was then run for another 12 minutes until a proximity probe indicated that a tooth had fractured. This paper discusses the damage detection effectiveness of the different metrics and a comparison of effects of the different accelerometer locations.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 2003
Accession Number
ADA416901

Entities

People

  • David G. Lewicki
  • Harry J. Decker

Organizations

  • National Aeronautics and Space Administration

Tags

Communities of Interest

  • Air Platforms
  • Biomedical
  • Energy and Power Technologies
  • Sensors

DTIC Thesaurus Topics

  • Aeronautics
  • Ball Bearings
  • Bearings
  • Damage Detection
  • Detection
  • Detectors
  • Frequency
  • Information Science
  • Materials
  • Measurement
  • Military Research
  • Monitoring
  • Space Sciences
  • Standards
  • Teeth
  • Test Stands
  • Visual Inspection

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