APPLICATIONS OF ρΣ RISK ANALYSIS IN SUPPORTABILITY RISK INDEX STUDY
Up to now we have realized that the unit supportability requirement is a kind of alternative supportability combination in acquisition process. System supportability is different if the different unit is chosen. The supportability index of the chosen unit needs to be appraised with statistics result. Therefore, the supportability index of the unit is a statistics result. Further study of the risk structure composed of unit risk and system risk is the foundation of operability of supportability. The study of the risk problem of Σρ is of representative significance, and the risk of supportability assessment is decided by the risk probability of the sum of the denominator ρΣ .There is only an item of maintenance rate for the availability assessment of a unite system, and the sum items here are more complicated. All items in the sum are calculated from samples in assessment, analysis and decision making, and appraisement and test, which can be analyzed by F distribution.Each state detained rate is a mutual independent random variable, and its approximate solution can be solved from the characteristics of the mean and variance and the center limit theorem. It has near normal distribution N(0,1). ) ( 2 F f and if if ∈σμ are the mean and variance of the detained rateif ρ, that is to say, if Gn is the accumulated distribution function of random variable ψn, we can get lim(n→∞) Gn(ψ)= Φ(ψ),and ρΣ under given confidence or risk can be assessed with this formula. The ρΣ given here can be used for practical assessment and calculation of the supportability risk in engineering and under the condition of standardized normal random variable.
Supportability risk Supportability assessment System state equation Integrated logistics support
Zuofu Tan Yiang Zhang Zhaohu Qu
Chongqing Area Engineering Representative Office, Yuzhou Road,Chongqing,400039, China
国际会议
北京
英文
1488-1497
2008-10-27（万方平台首次上网日期，不代表论文的发表时间）