THE RELIABILITY OF DIESEL MOTORS STUDIED THROUGH AHP OF FUZZY-WEIBULL TYPE

Paul MUREŞAN, Marcel POPA

Abstract


Reliability and life expectancy represent the capacity of a motor to function without drops, respectively, the functioning period until damaged. This study is done for the following purposes: - adopt a more rational choice of construction material destined for the fabrication of the component pieces of the motor, meant to satisfy a certain type of given conditions, - improvement of technologies in order to produce the component pieces; - establishing a link between the characteristics of life duration of the different component parts, in order to make possible the use of preventive repairs of the whole ensemble; - highlighting and an accurate specification of the resistance calculation; - the rationalization and modernization of the experimental techniques on the validation of the proposed mathematical model. The used mathematical model is formed out of the normal and Weibull distributions and fuzzy triangular numbers, in order to build the AHP algorithm, which leads to the determination of local and global weights. Finally, a study of behavior of the fiability function is made, for a couple of particular chases of the Weibull parameters.

Keywords: reliability, probability density, repartition function, fuzzy numbers

Full Text:

PDF

References


J.J.Buckley, T.Feuring and Y.Hayashi,Fuzzy hierarchical abalysis revised, European Journal of Operation Research 129, 2001

D.Dubois and H.Prade, The mean value of a fuzzy number, Fuzzy Sets and Systems, vol 24, 1987

A.Kaufmann and M.M.Gupta, Introduction to Fuzzy Arithmetic Theory and Application, Van Nostrand Reinhold, New York, 1991

P.W.Leth, Defence engineering plans military vehicle reliability, Autom.Ind, vol 121, No12,1959

H-X.Li and V.C.Yen, Fuzzy sets and fuzzy decision making, USA:CRC Press,New York, 1995

J.H.K. Kao, The Weibull distribution in the life testing of election tubes, unpubl. paper pres.at meeting of Amer.Stat.Ass.,1955

C.Kendreck, Vehicle component replacement policy, Rep. No5960-2, Dept.of.Eng.Proc.Univ. of Birmingham, 1961

T.G.Potra, Probabilităţi şi statistică matematică, Procese stochastice, Ed.Transilvania Press,2005

M.Vigier, L’interprétation des essais d’endurance grâce aux technique de la fiabilite, Bull.AFCIQ Mars 1965

W.Weibull, The phenomenon of rupture in solids, Ingen.Vetesk,Akad.Handl.1953

L.Zadeh, The linguistic approach and its application to decision analysis, Proceedings of conference on directions in decentralized control, Plenum Press, 1976

A.H.Zaludova. Problèmes de durée de vie: applications à l’industrie automobile, Revue de statistiqu appliquée, tome 13, no.4(1965), p.75-98


Refbacks

  • There are currently no refbacks.


JOURNAL INDEXED IN :