Accession Number : ADA290373

Title :   An Enhancement to the NA4 Gear Vibration Diagnostic Parameter.

Descriptive Note : Technical memo,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER

Personal Author(s) : Deckeer, Harry J. ; Handschuh, Robert F. ; Zakrajsek, James J.

PDF Url : ADA290373

Report Date : JUL 1994

Pagination or Media Count : 21

Abstract : A new vibration diagnostic parameter for health monitoring of gears, NA4, is proposed and tested. A recently developed gear vibration diagnostic parameter NA4 outperformed other fault detection methods at indicating the start and initial progression of damage. However, in some cases, as the damage progressed, the sensitivity of the NA4 and FM4 parameters tended to decrease and no longer indicated damage. A new parameter, NA4 was developed by enhancing NA4 to improve the trending of the parameter. This allows for the indication of damage both at initiation and also as the damage progresses. The NA4 parameter was verified and compared to the NA4 and FM4 parameters using experimental data from single mesh spur and spiral bevel gear fatigue rigs. The primary failure mode for the test cases was naturally occurring tooth surface pitting. The NA4 parameter is shown to be a more robust indicator of damage. (MM)

Descriptors :   *VIBRATION, *GEARS, DAMAGE ASSESSMENT, DIAGNOSTIC EQUIPMENT, FATIGUE(MECHANICS), TRANSMISSION GEARS, GEAR TEETH, PITTING.

Subject Categories : Machinery and Tools

Distribution Statement : APPROVED FOR PUBLIC RELEASE