Accession Number : ADA312684

Title :   Model-Based Sensor Location Selection for Helicopter Gearbox Monitoring.

Descriptive Note : Technical memo.,

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

Personal Author(s) : Jammu, Vinay B. ; Wang, Keming ; Danai, Kourosh ; Lewicki, David G.

PDF Url : ADA312684

Report Date : MAY 1996

Pagination or Media Count : 12

Abstract : A new methodology is introduced to quantify the significance of accelerometer locations for fault diagnosis of helicopter gearboxes. The basis for this methodology is an influence model which represents the effect of various component faults on accelerometer readings. Based on this model, a set of selection indices are defined to characterize the diagnosability of each component, the coverage of each accelerometer, and the relative redundancy between the accelerometers. The effectiveness of these indices is evaluated experimentally by measurement-fault data obtained from an OH-58A main rotor gearbox. These data are used to obtain a ranking of individual accelerometers according to their significance in diagnosis. Comparison between the experimentally obtained rankings and those obtained from the selection indices indicates that the proposed methodology offers a systematic means for accelerometer location selection.

Descriptors :   *ACCELEROMETERS, *HELICOPTERS, *TRANSMISSIONS(MECHANICAL), METHODOLOGY, POSITION(LOCATION), MONITORING, DIAGNOSIS(GENERAL), INDEXES, REDUNDANCY, SELECTION, FAULTS.

Subject Categories : Helicopters
      Navigation and Guidance
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE