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Spare part demanded quantity calculation method for Weibull-type serial components

A technology of Weibull type and calculation method, which is applied in the field of spare parts demand calculation, and can solve problems such as over-guarantee, insufficient guarantee, uncertain degree of guarantee, etc.

Active Publication Date: 2018-09-07
NAVAL UNIV OF ENG PLA
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Problems solved by technology

The results of spare parts demand calculated by this method are not only inaccurate, but also the level of assurance is uncertain, which may lead to over-insurance in some cases and under-insurance in others

Method used

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  • Spare part demanded quantity calculation method for Weibull-type serial components
  • Spare part demanded quantity calculation method for Weibull-type serial components
  • Spare part demanded quantity calculation method for Weibull-type serial components

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Experimental program
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Embodiment 1

[0048] Taking the number of installed machines N = 3 and the demand for spare parts S = 3 as an example, if the guarantee task is successful, the quantity of spare parts used by each unit location is shown in Table 1:

[0049] Table 1 Quantity of spare parts used in each unit position

[0050]

[0051]

[0052] For each row in the table, the probability of that event occurring can be calculated. For example, for the row data [1 0 2] in the table, its physical meaning is: all 3 unit positions are guaranteed success, 1 spare part is used in unit 1 position, no spare part is used in unit 2 position, and unit 3 position With 2 spare parts used, the probability of this event is equal to P(N s =1)×P(N s =0)×P(N s = 2), N s The physical meaning of is the quantity of spare parts used at each unit location during the sustainment mission. Add the probabilities of each row of events in Table 1 to get the probability when the total number of spare parts used is 3.

[0053] Speci...

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Abstract

The invention provides a spare part demanded quantity calculation method for Weibull-type serial components. According to the method, a matrix Sall of unit spare part using conditions at N positions is traversed and calculated; a corresponding probability P1<m> is calculated for each row vector Sall(m,:) (1<=m<=r) of the matrix Sall; spare part guarantee probabilities P<ok> are calculated; and theguarantee probabilities P<ok> are compared with a guarantee probability threshold P<s> till P<ok> is greater than or equal to P<s>, then j is the spare part demanded quantity, and calculation is ended. When the guarantee probability result calculated by the adoption of the method and a guarantee probability result calculated by the adoption of a simulation method are compared, the guarantee probability results obtained through the two methods are highly consistent, which shows the accuracy of the method; and through the method, not only can the spare part demanded quantity of the Weibull serial components be calculated, but also an extremely "secure" spare part scheme of the guarantee result can be given when the reliability connection relation among N same-type Weibull units inside equipment is not known on earth.

Description

technical field [0001] The invention relates to the field of spare parts requirement calculation, in particular to a method for calculating the spare parts requirement of Weibull type serial parts. Background technique [0002] Devices generally have a hierarchical structure. For example, equipment can be divided into: equipment, components, boards, components, etc. from the top layer to the bottom layer. Equipment is composed of various types of components, each of which is composed of various types of panels, and so on. In this article, we refer to the lowest replaceable / repairable product as a unit. Since the unit is at the bottom layer, its composition is relatively purer and purer, so the distribution type of its life is closer to the theoretical "standard" distribution type, such as the common exponential distribution, gamma distribution, normal distribution, Weibull distribution etc. [0003] In the equipment, there are often multiple units of the same type instal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/18G06Q10/06
CPCG06F17/18G06Q10/06315
Inventor 邵松世阮旻智王俊龙莫小杰李华
Owner NAVAL UNIV OF ENG PLA
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