SYMPOSIA PAPER Published: 01 January 2004

Effect of Individual Component Life Distribution on Engine Life Prediction


The 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 % probability of survival was determined based on 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 also were 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 L0.1 life prediction. However, at a probability of survival of 95% (L5 life), life decreased with increasing Weibull slope.

Author Information

Zaretsky, EV
National Aeronautics and Space Administration, Glenn Research Center, Cleveland, OH
Hendricks, RC
National Aeronautics and Space Administration, Glenn Research Center, Cleveland, OH
Soditus, SM
United Airlines Maintenance, San Francisco, CA
Price: $25.00
Contact Sales
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Developed by Committee: E08
Pages: 255–272
DOI: 10.1520/STP11291S
ISBN-EB: 978-0-8031-5496-4
ISBN-13: 978-0-8031-3478-2