Accession Number : ADA324929

Title :   Diagnostic Analyzer for Gearboxes (DAG): User's Guide. Version 3.1 for Microsoft Windows 3.1.

Descriptive Note : Final rept.,

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

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

PDF Url : ADA324929

Report Date : JAN 1997

Pagination or Media Count : 76

Abstract : This documentation describes the Diagnostic Analyzer for Gearboxes (DAG) software for performing fault diagnosis of gearboxes. First, the user would construct a graphical representation of the gearbox using the gear, bearing, shaft, and sensor tools contained in the DAG software. Next, a set of vibration features obtained by processing the vibration signals recorded from the gearbox using a signal analyzer is required. Given this information, the DAG software uses an unsupervised neural network referred to as the Fault Detection Network (FDN) to identify the occurrence of faults, and a pattern classifier called Single Category-Based Classifier (SCBC) for abnormality scaling of individual vibration features. The abnormality-scaled vibration features are then used as inputs to a Structure-Based Connectionist Network (SBCN) for identifying faults in gearbox subsystems and components. The weights of the SBCN represent its diagnostic knowledge and are derived from the structure of the gearbox graphically presented in DAG. The outputs of SBCN are fault possibility values between 0 and 1 for individual subsystems and components in the gearbox with a 1 representing a definite fault and a 0 representing normality. This manual describes the steps involved in creating the diagnostic gearbox model, along with the options and analysis tools of the DAG software.

Descriptors :   *COMPUTER AIDED DIAGNOSIS, *TRANSMISSIONS(MECHANICAL), COMPUTER PROGRAMS, USER MANUALS, VIBRATION, NEURAL NETS, DETECTION, DETECTORS, TOOLS, SIGNALS, SCALING FACTOR, COMPUTER GRAPHICS, DIAGNOSIS(GENERAL), COMPUTER NETWORKS, ANALYZERS, ABNORMALITIES, FAULTS, NORMALITY.

Subject Categories : Computer Programming and Software
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE