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A Calculation Method of Exponential Demand for Spare Parts with Lifetime Parts

A calculation method and demand technology, applied in the field of replacement calculation of life parts, can solve problems such as the inability to quantitatively calculate the guarantee effect of spare parts, and the complexity of forecasting the demand of index type spare parts with life parts, achieving small errors, convenient and fast production. , the result is accurate

Active Publication Date: 2019-08-27
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

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  • A Calculation Method of Exponential Demand for Spare Parts with Lifetime Parts
  • A Calculation Method of Exponential Demand for Spare Parts with Lifetime Parts
  • A Calculation Method of Exponential Demand for Spare Parts with Lifetime Parts

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Embodiment 1

[0036] According to one of the embodiments implemented in the above way, it is assumed that the average life of a certain unit is μ 0 , Life T obeys exponential distribution, denoted as T~exp(μ 0 ), the replacement cycle is specified 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, simulation verification was performed.

[0037] Table 1 is a comparison of the results achieved according to one of the first embodiments. The guarantee probability simulation result is the result of a standard parameter model established by the parameters accumulated in actual work. The guarantee probability index equivalent result means that there will be life parts in the prior art. The working life is directly regarded as the calculation result after exponential distribution. The general calculation parameters of the above three results are set as follows: The average life of a certain unit is μ 0 =800h,...

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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 calculation for replacement of life parts, and relates to an index-type method for calculating the demand for spare parts of life parts. Background technique [0002] Life-saving parts are parts with a prescribed period of preventive maintenance and replacement or scrapping and parts with predictable working life, also called life-limited parts. In the aviation field, aircraft spare parts are usually divided into initial spare parts, follow-up spare parts and life spare parts. The use of life parts can effectively prevent failures. Therefore, the use of life parts in the aviation field has great practical significance. [0003] There are two situations for replacement and maintenance of life parts: end-of-life replacement and failure replacement. The former refers to the replacement of life parts that have not failed until the specified replacement cycle and require preventive maintenance. The latter refers to the replac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/10
Inventor 邵松世张光宇李华黄傲林
Owner NAVAL UNIV OF ENG PLA
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