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Effect of Individual Component Life Distribution on Engine Life PredictionThe effect of individual engine component life distributions on engine life prediction was determined. A Weibull-based life and reliability analysis of the NASA Energy Efficient Engine was conducted. The engine s life at a 95 and 99.9 percent probability of survival was determined based upon the engine manufacturer s original life calculations and assumed values of each of the component s cumulative life distributions as represented by a Weibull slope. The lives of the high-pressure turbine (HPT) disks and blades were also evaluated individually and as a system in a similar manner. Knowing the statistical cumulative distribution of each engine component with reasonable engineering certainty is a condition precedent to predicting the life and reliability of an entire engine. The life of a system at a given reliability will be less than the lowest-lived component in the system at the same reliability (probability of survival). Where Weibull slopes of all the engine components are equal, the Weibull slope had a minimal effect on engine L(sub 0.1) life prediction. However, at a probability of survival of 95 percent (L(sub 5) life), life decreased with increasing Weibull slope.
Document ID
20030093640
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Authors
Zaretsky, Erwin V. (NASA Glenn Research Center Cleveland, OH, United States)
Hendricks, Robert C. (NASA Glenn Research Center Cleveland, OH, United States)
Soditus, Sherry M. (United Airlines Maintenance San Francisco, CA, United States)
Date Acquired
September 7, 2013
Publication Date
August 1, 2003
Subject Category
Aircraft Design, Testing And Performance
Report/Patent Number
E-13591
NAS 1.15:212532
NASA/TM-2003-212532
Meeting Information
Meeting: Probabilistic Aspects of Life Predictions
Location: Miami Beach, FL
Country: United States
Start Date: November 6, 2002
End Date: November 7, 2002
Sponsors: American Society for Testing and Materials
Funding Number(s)
WBS: WBS 323-71-00
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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