Diagnostic Modeling and Diagnosability Evaluation of Mechanical Systems-Reference-Cited by-同舟云学术

Diagnostic Modeling and Diagnosability Evaluation of Mechanical Systems

Published:1996-09-01 Issue:3 Volume:118 Page:425-431
ISSN:1050-0472
Container-title:Journal of Mechanical Design
language:en
Short-container-title:

Author:

Clark G. E.¹,Paasch R. K.²

Affiliation:

1. Hewlett Packard, Corvallis, OR

2. Department of Mechanical Engineering, Oregon State University, Corvallis, OR

Abstract

Consideration of diagnosability in product design promises to increase product quality by reducing maintenance time without increasing cost or decreasing reliability. Methods for investigating the diagnosability of mechanical and electro-mechanical systems are described and are applied to the Bleed Air Control System (BACS) on the Boeing 747-400. The BACS is described and a diagnostic model is developed using information from the system Failure Modes and Effects Analysis. Emphasis is placed on the relationships between the system’s functions and its components. Two metrics for the evaluation of system diagnosability and two metrics for the evaluation of component diagnosability are defined. These metrics emphasize diagnostic ambiguity and are combined with the probability of different system failures to weight the effects of each failure. Three modified systems are produced by reassigning functions from one component to another. The resulting effects on the system and component diagnosability are evaluated. We show that by changing these relationships system diagnosability can be improved without adding sensors or other components.

Publisher

ASME International

Subject

Computer Graphics and Computer-Aided Design,Computer Science Applications,Mechanical Engineering,Mechanics of Materials

Link

http://asmedigitalcollection.asme.org/mechanicaldesign/article-pdf/118/3/425/5747464/425_1.pdf

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