Reliability Evaluation of Transmission Planetary Gears “bottom-up” approach

• Published in: Eksploatacja i niezawodność
• Main Authors: Živković, Predrag, Milutinović, Miroslav, Tica, Milan, Trifković, Spasoje, Čamagić, Ivica
• Format: Journal Article
• Language: English
• Published: 01-01-2023
• ISSN: 1507-2711; 2956-3860
• DOI: 10.17531/ein.2023.1.2

The reliability study is the most important part of the engineering design
process, as it is the basis of analysis and assessment of future product
performance in exploitation. Since performance cannot be predicted
with absolute certainty, the application of reliability theory includes
probability theory and unreliability modeling. The proposed approach
has been applied to assess the reliability of gear planetary power
transmissions. The assessment of system reliability was determined on
the basis of the block diagram method, as a function of the reliability of
individual components, calculated by statistical analysis. Using the
Weibull model, the reliability of the planetary gear was defined on the
basis of the probability of failure of the gear teeth and the results were
interpreted to assess the reliability of the component and the entire
planetary train. For a more precise assessment of reliability and to avoid
modeling every failure and mode of occurrence, a competitive risk
model was developed. The reliability assessment study was conducted
with a “bottom-up” approach. Reliability has been assessed, for
instantaneous, estimated and assigned failures rate of planetary train and
component.