Accession Number : ADA298677

Title :   Diagnosis of Helicopter Gearboxes Using Structure-Based Networks.

Descriptive Note : Technical memo.,

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

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

PDF Url : ADA298677

Report Date : JUN 1995

Pagination or Media Count : 7

Abstract : A connectionist network is introduced for fault diagnosis of helicopter gearboxes that incorporates knowledge of the gearbox structure and characteristics of the vibration features as its fuzzy weights. Diagnosis is performed by propagating the abnormal features of vibration measurements through this Structure-Based Connectionist Network (SBCN), the outputs of which represent the fault possibility values for individual components of the gearbox. The performance of this network is evaluated by applying it to experimental vibration data from an OH-58A helicopter gearbox. The diagnostic results indicate that the network performance is comparable to those obtained from supervised pattern classification.

Descriptors :   *VIBRATION, *HELICOPTERS, *DIAGNOSTIC EQUIPMENT, *GEARS, MEASUREMENT, EXPERIMENTAL DATA, NETWORKS, WEIGHT, CLASSIFICATION, PATTERNS, FAULT TOLERANCE, ABNORMALITIES, TRANSMISSIONS(MECHANICAL).

Subject Categories : Helicopters
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE