Detection of gear wear on the 757/767 internal drive generator using higher order spectral analysis and wavelets

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Description

The 757/767 internal drive generator (IDG), which provides 400 Hz/120 volt ac power to the aircraft cabin experiences failures due to seizure of the scavenger drive pump and/or axial gears on the main drive shaft of the unit. These generators are an integral part of the aircraft`s engines sitting outboard, inside the engine cowling. The seizure of gears represents a significant loss with gear replacement estimated at $17,000 and unit replacement costs at $250,000. One of the U.S. commercial airline companies engaged Oak Ridge National Laboratory in a brief study to determine if a methodology could be developed to interrogate ... continued below

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8 p.

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Allgood, G.O.; Van Hoy, B.W. & Ayers, C.W. January 1, 1997.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 16 times , with 7 in the last month . More information about this article can be viewed below.

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Description

The 757/767 internal drive generator (IDG), which provides 400 Hz/120 volt ac power to the aircraft cabin experiences failures due to seizure of the scavenger drive pump and/or axial gears on the main drive shaft of the unit. These generators are an integral part of the aircraft`s engines sitting outboard, inside the engine cowling. The seizure of gears represents a significant loss with gear replacement estimated at $17,000 and unit replacement costs at $250,000. One of the U.S. commercial airline companies engaged Oak Ridge National Laboratory in a brief study to determine if a methodology could be developed to interrogate and diagnose gear wear with the ultimate goal of deploying an instrument for test stand and flight line use. Through a structured analysis it was determined that accelerometers mapped with higher order spectral analysis (HOSA) and/or wavelets could provide an analytic approach and basis for a diagnostic sensor/system capable of assessing IDG gear wear on the aircraft or the test stand.

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8 p.

Notes

OSTI as DE97001505

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  • International modal analysis conference, Orlando, FL (United States), 3-6 Feb 1997

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  • Other: DE97001505
  • Report No.: CONF-970233--1
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 437772
  • Archival Resource Key: ark:/67531/metadc681880

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  • January 1, 1997

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  • July 25, 2015, 2:20 a.m.

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  • Jan. 19, 2016, 12:40 p.m.

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Allgood, G.O.; Van Hoy, B.W. & Ayers, C.W. Detection of gear wear on the 757/767 internal drive generator using higher order spectral analysis and wavelets, article, January 1, 1997; Tennessee. (digital.library.unt.edu/ark:/67531/metadc681880/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.