Reliability evaluation method for structural mechanism products of carrier rockets

Abstract

The invention discloses a reliability evaluation method for structural mechanism products of carrier rockets to achieve the purpose of quantitative evaluation of the reliability of various mechanism products of carrier rockets. The method comprises the following steps that firstly, the three-element information of products is determined, and a failure mode distribution type, performance indexes and types which a functional type belongs to of the products are listed; secondly, based on the priority selection principle, applicable evaluation models are determined, wherein the corresponding evaluation models are determined in the sequence of A, the failure mode distribution type, B, the performance indexes and C, the functional type; thirdly, needed test information corresponding to the reliability models is collected; fourthly, reliability calculation is carried out according to the selected reliability models and reliability data. By means of the method, the current situation that at present, qualitative evaluation of structural mechanism products of carrier rocket serves as the main part, and reliability evaluation is insufficient in systematicness and normalization is changed, and the characteristic of small samples of mechanism products of carrier rockets can be met.

Description

technical field [0001] The invention relates to a reliability evaluation method, in particular to a reliability quantitative evaluation method used for launch vehicle structural mechanism products. Background technique [0002] At present, the known existing reliability evaluation methods of aerospace products mainly include probability statistics method (success or failure type, exponential distribution, Weibull distribution, normal distribution), stress-strength method and so on. Through the above analysis, the selection of product reliability evaluation methods for the launch vehicle structure mechanism of the Eighth Academy at this stage is determined, as shown in Table 1. [0003] Table 1 The current product reliability evaluation methods of launch vehicle structure mechanism [0004] [0005] Through analysis, the current product reliability evaluation of launch vehicle structure system mainly has the following problems: [0006] 1) At present, structural mechanis...

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Problems solved by technology

[0012] In order to solve the problems of complex failure modes of structural mechanism products, different model selection principles, and small sample size, the idea of ​​a method for evaluating the reliability of launch vehicle structural mechanism products in the present invention is as follows:

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