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A method for calculating loss quantity of exponential unit spare parts

A calculation method, an exponential technology, applied in the direction of calculation, data processing applications, instruments, etc., can solve the problems of spare parts guarantee effect without considering the loss of spare parts, not in line with the actual situation, unable to accurately reflect the cost of spare parts, etc., to achieve fast and convenient calculation, The error is small and the effect of meeting the requirements of engineering application

Active Publication Date: 2019-04-09
NAVAL UNIV OF ENG PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Evaluating the effect of spare parts support without considering the loss of spare parts is not in line with the actual situation, nor can it accurately reflect the cost of spare parts support

Method used

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  • A method for calculating loss quantity of exponential unit spare parts
  • A method for calculating loss quantity of exponential unit spare parts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The storage life of an exponential unit obeys the exponential distribution Exp(0.0002), the working life obeys the exponential distribution Exp(0.001), and the guaranteed task time T w =5000h, the number of spare parts S n is 8, try to calculate the number of spare parts loss N f Proceed as follows:

[0021] S1, initialization step

[0022] Let the current spare parts quantity S now =8,N f = 0, i = 1;

[0023] S2, cyclic calculation steps

[0024] S2.1, calculate the moment cT of the i-th warehouse inventory i

[0025]

[0026] S2.2, calculate the staged storage time Tzc

[0027] Since i=1, let Tzc=cT 1 =1835.8;

[0028] S2.3, Calculation of storage failure probability P z0

[0029] make

[0030] 2.4, update N f , S now

[0031] Order N f =N f +S now ×P z0 =2.46, let S now =max([(S now -1)×(1-P z0 )0])=4.85;

[0032] 2.5, let i=i+1=2, because i≤S n , so turn to step S2.1 and repeat the above steps;

[0033] When i=i+1=9, since i>S n , so ...

Embodiment 2

[0037] The storage life of an exponential unit obeys the exponential distribution Exp(0.0002), the working life obeys the exponential distribution Exp(0.001), and the guaranteed task time T w When =5000h, the number of spare parts k is 8, and the simulation process steps of the spare parts guarantee process with the risk of storage failure are as follows:

[0038] 1) The working time simTw=0 of the initialization unit;

[0039] 2) Generate a random number t 0 , used to simulate the working life of the unit in the equipment, t 0 obey the exponential distribution Exp(λ 2 ); let simTw=t 0 ;

[0040] 3) Generate k random numbers t1 m (1≤m≤k), used to simulate the storage life of spare parts, t1 m obey the exponential distribution Exp(λ 1 );

[0041] 4) Generate k random numbers t2 m (1≤m≤k), used to simulate the working life of spare parts, t2 m obey the exponential distribution Exp(λ 2 );

[0042] 5) Compare the size of simTw and Tw

[0043] If simTw>Tw, then this si...

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Abstract

The invention provides a method for calculating the loss number of exponential unit spare parts, which comprises an initialization step, a cyclic calculation step and a result output step, is accuratein calculation, small in error and rapid and convenient in calculation, is close to a traditional simulation result of a spare part guarantee process with storage failure risks, and meets the engineering application requirements.

Description

technical field [0001] The invention relates to the field of calculation of demand for spare parts, in particular to a calculation method for the loss quantity of exponential unit spare parts. Background technique [0002] In actual work, the spare parts in the warehouse may be out of storage. In this paper, the storage failure of spare parts before use is called loss. Accurately calculating the loss of spare parts can quantitatively describe the degree of support of equipment from the perspective of economic cost. [0003] Lost spare parts are a waste and a real cost. In the process of calculating the demand for spare parts, it is generally necessary to evaluate the guarantee effect of spare parts from the perspectives of income and cost. Generally, indicators such as spare parts guarantee probability and availability are used to quantify benefits, and indicators such as spare parts procurement cost and spare parts utilization rate are used to quantify costs. The utiliz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/08
CPCG06Q10/0875
Inventor 阮旻智李华王俊龙张光宇
Owner NAVAL UNIV OF ENG PLA
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