Reliability evaluation method for structural mechanism products of carrier rockets

A carrier rocket and reliability technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as complex failure modes of structural mechanism products, different model selection principles, and small sample size

CN106202776AActive Publication Date: 2016-12-07SHANGHAI AEROSPACE SYST ENG INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2016-12-07

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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.
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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...

Examples

Embodiment Construction

[0031] A product reliability evaluation method of a launch vehicle structural mechanism of the present invention, the basic program of the product reliability evaluation of the launch vehicle structural mechanism includes: product requirement analysis, product reliability analysis, reliability evaluation model establishment, data collection and processing, and reliability evaluation Calculation and preparation of reliability assessment reports, etc.

[0032] The present invention refines the process from establishing the product reliability evaluation model of the launch vehicle structure mechanism to the reliability evaluation calculation process in the above program in combination with the characteristics of the product of the rocket structure mechanism. Its steps include:

[0033] Step 1: Confirm the "three elements" information of the object

[0034] The "three elements" information of rocket structure mechanism products includes element A (failure mode type), element B (...