Accession Number : ADA290198

Title :   Analysis of the Effects of Surface Pitting and Wear on the Vibrations of a Gear Transmission System.

Descriptive Note : Technical memo.,

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

Personal Author(s) : Choy, F. K. ; Polyshchuk, V. ; Zakrajsek, J. J. ; Handschuh, R. F. ; Townsend, D. P.

PDF Url : ADA290198

Report Date : JUL 1994

Pagination or Media Count : 10

Abstract : A comprehensive procedure to simulate and analyze the vibrations in a gear transmission system with surface pitting, wear, and partial tooth fracture of the gear teeth is presented. An analytical model was developed where the effects of surface pitting and wear of the gear tooth were simulated by phase and magnitude changes in the gear mesh stiffness. Changes in the gear mesh stiffness were incorporated into each gear-shaft model during the global dynamic simulation of the system. The overall dynamics of the system were evaluated by solving for the transient dynamics of each shaft system simultaneously with the vibration of the gearbox structure. In order to reduce the number of degrees-of-freedom in the system, a modal synthesis procedure was used in the global transient dynamic analysis of the overall transmission system. An FET procedure was used to transform the averaged time signal into the frequency domain for signature analysis. In addition, the Wigner-Ville distribution was also introduced to examine the gear vibration in the joint time-frequency domain for vibration pattern recognition. Experimental results obtained from a gear fatigue test rig at NASA Lewis Research Center were used to evaluate the analytical model.

Descriptors :   *COMPUTERIZED SIMULATION, *VIBRATION, *GEARS, *FATIGUE TESTS(MECHANICS), *TRANSMISSIONS(MECHANICAL), MATHEMATICAL MODELS, TRANSIENTS, SYNTHESIS, DYNAMICS, STIFFNESS, TEST EQUIPMENT, RESEARCH FACILITIES, FRACTURE(MECHANICS), MESH, TIME, DEGREES OF FREEDOM, TRANSMITTANCE, SURFACES, DIAGNOSIS(GENERAL), SIGNATURES, PATTERN RECOGNITION, DYNAMIC LOADS, SHAFTS(MACHINE ELEMENTS), FAILURE(MECHANICS), FREQUENCY DOMAIN, TIME SIGNALS, GEAR TEETH, PITTING.

Subject Categories : Mfg & Industrial Eng & Control of Product Sys
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE