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Analytical approach to product reliability estimation based on life test data for an automotive clutch system

Niknafs H., Faridkhah M., Kazemi C.

Mechanics and Mechanical Engineering

2018

Vol. 22, nr 4

845--863

The study of reliability is an important part of engineering design process which forms the basis of analysis and judgment on future performance of the product. Since the future couldn't be predicted with an absolute certainty, the nature of reliability would lead us to probability theory and uncertainty modeling. The quantitative calculation of this parameter for mechanical systems within different steps of production requires an analytical and systematic approach which has been focused in this paper. The proposed approach has been applied for calculating reliability of a clutch system as a case study. The system reliability in this work is determined based on the block diagram method as a function of individual component reliabilities which are calculated by statistical analysis of life test results. Using Weibull model, reliability of a typical clutch system has been formulated based on durability bench test and results has been interpreted to estimate field reliability.

Evaluation of wind energy potential for four sites in Ireland using the Weibull distribution model

Jamdade P. G., Jamdade S. G.

Journal of Power Technologies

2015

Vol. 95, nr 1

48--53

Wind speed is receiving greater attention in the design and study of wind energy conversion systems (WECS). Using meteorological data, this paper studies the availability of wind energy potential at four sites in Ireland: Malin Head, Dublin Airport, Belmullet and Mullingar. An analysis is made of mean wind speed data collected at a height of 50 m above ground level at each site over a period of seven years. A two parameter Weibull distribution model is used to analyze wind speed pattern variations. Weibull parameters are calculated by the Least Squares Method (LSM). The results relating to wind energy potential are given in terms of the density function. Analysis shows that coastal sites of Ireland such as Malin Head, Dublin Airport and Belmullet have good wind power potential.