RAMS Tutorial Final 2009 A

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• Publié par: Baheh
• Nombre de lectures: 22
• Langue: English

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Copyright © 2009 IEEE. Reprinted from "2009 PROCEEDINGS
Annual RELIABILITY and MAINTAINABILITY Symposium,
Fort Worth, Texas, USA, January 26-29, 2009.
This material is posted here with permission of the IEEE. Such
permission of the IEEE does not in any way imply IEEE
endorsement of any of ReliaSoft Corporation's products or
services. Internal or personal use of this material is permitted.
However, permission to reprint/republish this material for
advertising or promotional purposes or for creating new collective
works for resale or redistribution must be obtained from the IEEE
by writing to [e-mail].
By choosing to view this document, you agree to all provisions of
the copyright laws protecting it.Reliability from Design Inception to
Product Retirement
By
Duane L Dietrich PhD
Director of Consulting Services, ReliaSoft
Professor Emeritus, University of ArizonaScope of Presentation
In this presentation, an outline of a
cohesive structure for reliability
throughout a product’s life cycle is
presented including the appropriate
location and use of:
1. The Over Stress Tests,
2. Design Reviews,
3. FMEAs,
4. Reliability System Analysis,
2009 RAMS – Paper/Tutorial 04A - Duane Dietrich PhD
2Scope (Cont.)
5. Accelerated Life Tests,
6. Real Time Life Tests,
7. Reliability Growth Tests, Burn-In
8. Field failures
9. Engineering change orders
2009 RAMS – Paper/Tutorial 04A - Duane Dietrich PhD
3Corrective Action Cost as a Function of Design
Phase
1000x
100x
10x
1x
Concept Development Pre-production Production Field Service
The Earlier A Reliability Improvement Is Implemented,
The Lower The Cost Of The Corrective Action.
2009 RAMS – Paper/Tutorial 04A - Duane Dietrich PhD
4Figure 2, Impact of Reliability on the Producer
Total Cost
Price
Profit
Warranty
Production Cost
Cost
Optimum
Reliability Level
Highest Reliability Is Not Necessarily the Most Economical
2009 RAMS – Paper/Tutorial 04A - Duane Dietrich PhD
5
CostCost Benefit of Investment in Reliability
A 5% increase in Reliability Focused
development costs will return a 10% reduction
in warranty costs.
A 20% increase in Reliability Focused
development costs will typically reduce
warranty costs by Half.
A 50% increase in
development costs will reduce warranty cost
by a factor of Five .
Reference: The Cost and Benefits of Reliability in Military Equipment, Rand Corp, 1988
2009 RAMS – Paper/Tutorial 04A - Duane Dietrich PhD
6Reliability from Design Inception to Product
Retirement
2.0
1.0 3.0 4.0 4.0
Initial
Design Build and Test Reliability
Reliability
System Prototype Predictions
Predictions
5.0 6.0 7.07.0
Initial Reliability Pre-Production
Production Verification Reliability
Run Tests Predictions
9.0
8.0 Collect and
Production Analyze Field
Data
2009 RAMS – Paper/Tutorial 04A - Duane Dietrich PhD
7Design System 1.0
Customer
Mission
Requirements and
Operating
Operating
Profile and
Specifications
Environment
Time
1.1
1.1
1.3
1.2
Data Design
System
System
1.4 1.0
Design FMEAFMEA Design Component
Product FMEA Reviews Selection FMEA
1.5 1.6 1.7
2009 RAMS – Paper/Tutorial 04A - Duane Dietrich PhD
8Design System, 1.0 Cont.
Component
Design
and Sub-
System
System Test
1.0
1.8
1.8
2009 RAMS – Paper/Tutorial 04A - Duane Dietrich PhD
9