Accession Number : ADA292525

Title :   R&M Design Expert System.

Descriptive Note : Final technical rept. Sep 91-Sep 94,

Corporate Author : MARTIN MARIETTA CORP MOORESTOWN NJ

Personal Author(s) : Kitchen, Angela M. ; Steelhammer, Jeff ; Doskocil, Doug ; Freeman, Eric ; Elias, Glenn

PDF Url : ADA292525

Report Date : DEC 1994

Pagination or Media Count : 119

Abstract : This effort investigated and developed a proof-of-concept software system that combines reliability, testability, and maintainability analysis capabilities into a single tool. The system recommends tests and testpoints based on potential faults (associated with a component within the design) and a functional-block description of the design. The system directs the user in injecting faults into a simulation model. The tests and testpoints are then used to perform fault isolation using the results of the simulation. Case-based reasoning techniques were used as a basis for the testability and test coverage aspects of the program. The casebase is a repository of "past knowledge" gained from expert designers and testability experts. The system adds to this repository if an unfamiliar situation occurs, allowing the system to "learn" over time. The expert knowledge was encoded into a Fault Mode Map that represents how the experts relate faulty behavior of the circuits to actual failures. Rome Laboratory Oracle (a reliability prediction tool), Mentor Graphics design Architect (a schematic capture tool), and Analogy Saber (a circuit simulation tool) were integrated to allow the user to exercise all system capabilities from a single user perspective. The system was tested against Martin Marietta power supply design.

Descriptors :   *SOFTWARE ENGINEERING, *EXPERT SYSTEMS, *COMPUTER PROGRAM VERIFICATION, TEST AND EVALUATION, COMPUTER PROGRAMS, COMPUTERIZED SIMULATION, SIMULATORS, COMPUTER AIDED DESIGN, PREDICTIONS, TOOLS, REASONING, ISOLATION, MAINTAINABILITY, POWER SUPPLIES, USER NEEDS, MAPS, CIRCUITS, RELIABILITY(ELECTRONICS), SCHEMATIC DIAGRAMS, FAULTS.

Subject Categories : Computer Programming and Software

Distribution Statement : APPROVED FOR PUBLIC RELEASE