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Method of calculating exponential life-limited spares demand

A calculation method and demand technology, applied in the direction of calculation, electrical digital data processing, special data processing applications, etc., can solve the problems of complex forecasting of exponential life-span spare parts demand, inability to quantitatively calculate the effect of spare parts guarantee, etc. Achieve the effect of small error, convenient and fast, accurate results

Active Publication Date: 2017-06-13
NAVAL UNIV OF ENG PLA
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Problems solved by technology

[0005] In the prior art, the method of calculating the demand for life-spanning spare parts is mainly based on the actual average consumption quantity multiplied by a weighting coefficient greater than 1. The defect of this calculation method is that it cannot quantitatively calculate the effect of spare parts guarantee, such as the quantitative calculation of spare parts guarantee probability or use availability
[0006] To achieve the effect of quantitative calculation guarantee, it is necessary to consider complex situations such as life replacement and failure replacement. Exponential life parts may fail randomly within the specified time limit, which makes the prediction work of exponential life parts spare parts demand change. get complicated

Method used

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  • Method of calculating exponential life-limited spares demand
  • Method of calculating exponential life-limited spares demand

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Embodiment 1

[0036] According to one of the embodiments implemented in the above manner, it is assumed that the average lifetime of a certain unit is μ 0 , the lifetime T obeys the exponential distribution, recorded as T~exp(μ 0 ), and its replacement cycle is stipulated as T r , the guarantee task time is T w , the number of spare parts is S. In order to verify the accuracy of the method of the present invention, a simulation verification is carried out.

[0037] Table 1 is a comparison of the results achieved according to one of the first embodiments, wherein the guarantee probability simulation result is the result of a standard parameter model established through the parameters accumulated in actual work, and the guarantee probability index equivalent result refers to the life expectancy of the existing technology. The working life is directly regarded as the calculation result after the exponential distribution, and the general calculation parameters of the above three results are ...

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Abstract

The invention discloses a method of calculating exponential life-limited spares demand; the method mainly comprises the steps of simulating life of a life-limited spare to produce life random numbers ti of not less than 1000 life-limited spares, wherein the life random numbers ti comply with exponential distribution exp(Mu0); simulating service lives of life-limited spares; traversing and correcting the random numbers ti to obtain ti; subjecting the random numbers ti of step 2 to normal distribution fitting calculation, with the calculation result marked as N(Mu, Sigma2); calculating spares support probability P within support task time when the number of the life-limited spares is j; setting a threshold of the support probability so that a number S of the life-limited spares, satisfied when the support probability is greater than or equal to the above threshold, is the calculated demand for life-limited spares. The method of calculating exponential life-limited spares demand implemented according to the invention allows the demand for exponential life-limited spares to be calculated accurately.

Description

technical field [0001] The invention belongs to the field of replacement calculation of life parts, and relates to a calculation method of exponential demand for life parts spare parts. Background technique [0002] End-of-life parts are parts that stipulate the period of preventive maintenance replacement or scrapping and parts with predictable working life, 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. Lifetime parts can effectively prevent failures, so the use of lifelong parts has great practical significance, especially in the aviation field. [0003] There are two types of parts replacement maintenance for life-span parts: end-of-life replacement and failure replacement. The former refers to the replacement of life-span parts that require preventive maintenance after working until the specified replacement period has not yet failed. The l...

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Application Information

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IPC IPC(8): G06F19/00
Inventor 邵松世张光宇李华黄傲林
Owner NAVAL UNIV OF ENG PLA
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