Method for calculating demand quantity of spare parts of gamma type life-limiting parts

Abstract

The invention discloses a method for calculating a demand quantity of spare parts of gamma type life-limiting parts. The method mainly comprises the following executive steps of 1, simulating the lives of the spare parts, and generating N random numbers, which obey gamma distribution, wherein gamma distribution sizes and parameters of the spare parts are same; 2, simulating working lives of the spare parts, and traversing and correcting the N random numbers ti to obtain ti; 3, performing gamma distribution fitting calculation on the N random numbers ti to obtain gamma distribution parameters a' and b' used for calculating a support probability of the spare parts; 4, calculating the support probability P of the spare parts by utilizing the gamma distribution parameters obtained in the step 3; and 5, setting a support probability threshold of the spare parts, and enabling an S value with the support probability P of the spare parts greater than or equal to the threshold to be the calculated demand quantity of the spare parts. According to the method for calculating the demand quantity of the spare parts, provided by the invention, the demand quantity of the spare parts of the gamma distribution type life-limiting parts can be subjected to calculation accurately reflecting the support probability.

Description

technical field [0001] The invention belongs to the field of life calculation of life spare parts and relates to a calculation method of gamma-type life spare parts demand. Background technique [0002] Life-saving parts are parts that have stipulated the period of preventive maintenance, replacement or scrapping and parts whose service life can be estimated, also known as life-limited parts. In the field of aviation, aircraft spare parts are usually divided into initial spare parts, follow-up spare parts and end-of-life spare parts. The use of life parts can effectively prevent failures, so the use of life parts especially in the aviation field has great practical significance. There are not many domestic studies on the demand for end-of-life spare parts. The method of calculating the demand for spare parts is mainly based on the statistical method of multiplying the actual average consumption quantity by a weighting coefficient greater than 1. This method cannot solve the...

AI Technical Summary

Problems solved by technology

However, due to the possibility of random failure of the life parts within the specified period, the forecasting of the demand for life parts and spare parts becomes complicated.

[0004] Gamma distribution is often used to describe failures caused by "shock". If a unit can withstand several external shocks, it will fail when the number of shocks accumulated by the unit reaches a certain number of times. There is no gamma distribution in the prior art. Calculation method that can accurately reflect the guarantee probability for the demand of life-span spare parts

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