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Spare part demand quantity calculation method for multiple sets of equipment

A calculation method and demand technology, applied in calculation, manufacturing calculation system, computer-aided design, etc., can solve the problem that the utilization efficiency of spare parts is not the maximum

Active Publication Date: 2018-07-20
NAVAL UNIV OF ENG PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] 2) The unit failure is a "soft failure", that is, when the performance of the unit continues to drop 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 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
The advantage of this strategy is that the maintenance tasks can be carried out / completed as soon as possible, but the disadvantage is that the utilization of spare parts is not the greatest

Method used

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

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Experimental program
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Embodiment 1

[0077] 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.

[0078] The calculation steps are as follows:

[0079] Step S1, in a traversal manner, generate a description of all "Nz sets of equipment with a good number greater than or equal to N min ” The matrix Zok of the situation. ...

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Abstract

The invention provides a spare part demand quantity calculation method for multiple sets of equipment. The method comprises the steps of generating matrixes Zok describing all conditions in which thenumber of intact equipment of Nz sets of equipment is larger than or equal to Nmin through traversing, traversing to calculate failure degrees of various types of units, initializing a spare part scheme, calculating the guaranteeing effect of the spare part scheme, and conducting judgment, wherein calculation is ended if P0 is larger than or equal to Ps; if P0 is smaller than Ps, traversing to generate a candidate spare part scheme, and calculating the corresponding marginal effectiveness; finding out a serial number Jm corresponding to the maximal value from all marginal effectiveness dVj, traversing within the range that d is larger than or equal to 1 and smaller than or equal to Nd, and obtaining the updated spare part scheme. By means of the spare part demand quantity calculation method, the precision is high, and a conservative estimation result which guarantees the effect can be provided for other overhauling 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] Accurately calculating the demand for spare parts can quantitatively describe the degree of support of equipment from the perspective of economic costs such as the corresponding spare parts procurement costs. [0003] 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" dist...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20G06F30/398G06F2119/04Y02P90/30
Inventor 李婧李华吴笛霄陈浩
Owner NAVAL UNIV OF ENG PLA
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