Accession Number : ADA294590

Title :   A Review of Transmission Diagnostics Research at NASA Lewis Research Center.

Descriptive Note : Technical memo.,

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

Personal Author(s) : Zakrajsek, James J.

PDF Url : ADA294590

Report Date : DEC 1994

Pagination or Media Count : 24

Abstract : This paper presents a summary of the transmission diagnostics research work conducted at NASA Lewis Research Center over the last four years. In 1990, the Transmission Health and Usage Monitoring Research Team at NASA Lewis conducted a survey to determine the critical needs of the diagnostics community. Survey results indicated that experimental verification of gear and bearing fault detection methods, improved fault detection in planetary systems, and damage magnitude assessment and prognostics research were all critical to a highly reliable health and usage monitoring system. In response to this, a variety of transmission fault detection methods were applied to experimentally obtained fatigue data. Failure modes of the fatigue data include a variety of gear pitting failures, tooth wear, tooth fracture, and bearing spalling failures. Overall results indicate that, of the gear fault detection techniques, no one method can successfully detect all possible failure modes. The more successful methods need to be integrated into a single more reliable detection technique. A recently developed method, NA4*, in addition to being one of the more successful gear fault detection methods, was also found to exhibit damage magnitude estimation capabilities. (MM)

Descriptors :   *HELICOPTERS, *TRANSMISSION GEARS, *TRANSMISSIONS(MECHANICAL), MONITORING, HEALTH, RESEARCH FACILITIES, FRACTURE(MECHANICS), TRANSMITTANCE, RELIABILITY, WEAR, AVIATION ACCIDENTS, DIAGNOSIS(GENERAL), FATIGUE(MECHANICS), BEARINGS, AVIATION SAFETY, FAILURE(MECHANICS), FAULT TOLERANCE, FAULTS, PLANETS, SPALLATION, TEETH.

Subject Categories : Helicopters
      Machinery and Tools

Distribution Statement : APPROVED FOR PUBLIC RELEASE