Accession Number : ADA298645

Title :   Detecting Gear Tooth Fracture in a High Contact Ratio Face Gear Mesh.

Descriptive Note : Technical memo.,

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

Personal Author(s) : Zakrajsek, James J. ; Handschuh, Robert F. ; Lewicki, David G. ; Decker, Harry J.

PDF Url : ADA298645

Report Date : JAN 1995

Pagination or Media Count : 13

Abstract : This paper summarizes the results of a study in which three different vibration diagnostic methods were used to detect gear tooth fracture in a high contact ratio face gear mesh. The NASA spiral bevel gear fatigue test rig was used to produce unseeded fault, natural failures of four face gear specimens. During the fatigue tests, which were run to determine load capacity and primary failure mechanisms for face gears, vibration signals were monitored and recorded for gear diagnostic purposes. Gear tooth bending fatigue and surface pitting were the primary failure modes found in the tests. The damage ranged from partial tooth fracture on a single tooth in one test to heavy wear, severe pitting, and complete tooth fracture of several teeth on another test. Three gear fault detection techniques, FM4, NA4*, and NB4, were applied to the experimental data. (MM)

Descriptors :   *FRACTURE(MECHANICS), *HELICOPTERS, *TRANSMISSION GEARS, *GEAR TEETH, VIBRATION, DAMAGE ASSESSMENT, BENDING, MESH, WEAR, FAILURE(MECHANICS), FREQUENCY DOMAIN, FATIGUE TESTS(MECHANICS), METAL CONTACTS, PITTING.

Subject Categories : Helicopters
      Machinery and Tools

Distribution Statement : APPROVED FOR PUBLIC RELEASE