2009•Gas Turbine Experiment and ResearchRequires access

MTBF Calculation Study for Aero-engine Complete Life Data Based on the Weibull Distribution Model

Lei You-feng

Abstract

Complete life data of some aero-engines in active service was collected and analyzed.With a hypothesis test,it concluded that using Weibull distribution to process these data was better than using other model.Then,a three-parameter Weibull distribution method was conducted to numerically analyze the time between failures of 317 faults of the same type aero-engine.The averaged distribution and the confidence interval of the given confidence limit of MTBF were then obtained.The result proved that the Weibull distribution could describe the true distribution rule of the time between failures of the aeroengine well.Through the study of this paper,a preliminary procedure to statistically evaluate the MTBF of an aero-engine in outfield application was established.

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Key concepts: Weibull distribution, Mean time between failures, Confidence interval, Interval (graph theory), Engineering, Statistics, Reliability engineering, Distribution (mathematics)