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Spare part demand calculation method for multiple sets of equipment

A calculation method and technology of demand, applied in computing, instrumentation, data processing applications, etc.

Active Publication Date: 2018-07-20
NAVAL UNIV OF ENG PLA
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Problems solved by technology

[0009] 2) The unit failure is a "soft failure", that is, when the performance of the unit continues to decline to a certain value, the unit can be identified as "faulty", but at this time the unit does not stop working, and its "fault" effect is the same as that of other units. The equipment is affected in a comprehensive way, and the faulty unit can only be found and repaired in the way of maintenance after the event

Method used

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  • Spare part demand calculation method for multiple sets of equipment
  • Spare part demand calculation method for multiple sets of equipment
  • Spare part demand calculation method for multiple sets of equipment

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Embodiment 1

[0047] There are 3 types of units in a certain type of equipment, the life of the first type of units obeys the exponential distribution Exp(0.002), and the price is 100 yuan; the life of the second type of units obeys the normal distribution of N(600,130 2 ), the price is 150 yuan; Type 3 unit life obeys the Weibull distribution W(600,1.8), and the price is 200 yuan. There are 5 sets of this type of equipment, and the accumulative working time of the equipment is T=500h. Now these 5 pieces of equipment are about to be overhauled. After the overhaul is completed, the number of intact equipment is N ok The probability P(N ok ≥4) greater than or equal to 0.85. Calculate the demand for spare parts required for each type of unit in this maintenance work.

[0048] The calculation steps are as follows:

[0049] Step S1, traverse and calculate the failure degree Pf of each type of unit d , 1≤d≤Nb, d is the serial number of the unit type.

[0050] Failure degree Pf of type 1 exp...

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Abstract

The invention proposes a spare part demand calculation method for multiple sets of equipment, and the method comprises the steps: carrying out the traversing calculation of failure degrees of varioustypes of units, initializing a spare part scheme, and calculating a guarantee effect of the spare part scheme; ending the calculation if P0 is not less than Ps; carrying out the traversing to generatea candidate spare part scheme if P0 is less than Ps, calculating the corresponding marginal benefits, searching a serial number Jm corresponding to the maximum value in all marginal benefits dVj, carrying out the traversing in a range of 1<=d<=Nd, obtaining an updated spare part scheme, and obtaining a final result through the circulating traversing calculation. The method is very high in accuracy, and the spare part guarantee effect under a cannibalizing and maintenance strategy can be considered as an upper limit result of all other maintenance strategies under the condition of the same spare part demands. Therefore, the method provided by the invention can provide a considerable estimation result of the guarantee effect for other maintenance strategies when there is no accurate calculation method of the spare part guarantee effect under other maintenance strategies.

Description

technical field [0001] The invention relates to the field of spare parts demand calculation, in particular to a method for calculating the spare parts demand of multiple sets of equipment. 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] Generally speaking, the lifespan of electronic components and other units obeys t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/04G06Q10/06
CPCG06Q10/04G06Q10/0639
Inventor 李婧李华吴笛霄陈浩
Owner NAVAL UNIV OF ENG PLA
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