CN111090015A - Reliability assessment method based on environmental stress influence factor - Google Patents
Reliability assessment method based on environmental stress influence factor Download PDFInfo
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- CN111090015A CN111090015A CN201911329958.4A CN201911329958A CN111090015A CN 111090015 A CN111090015 A CN 111090015A CN 201911329958 A CN201911329958 A CN 201911329958A CN 111090015 A CN111090015 A CN 111090015A
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Abstract
The invention relates to the technical field of reliability evaluation, in particular to a reliability evaluation method based on environmental stress influence factors. A reliability assessment method based on environmental stress influence factors comprises the following steps: s1, listing names and quantities of all electronic components on equipment; s2, classifying all electronic components on the equipment; s3, calculating the weighted average value of the three environmental coefficients of all the components; and S4, calculating the reliability test time through a formula. The invention relates to a method for calculating environmental coefficients of various components; the method is a calculation method for converting other test time into reliability test time; but also a feasible reliability assessment scheme when the MTBF value of the device is large.
Description
Technical Field
The invention relates to the technical field of reliability evaluation, in particular to a reliability evaluation method based on environmental stress influence factors.
Background
Under the drive of multiple factors such as traction of military application requirements, manufacturing process change of components and complete machines, technical level improvement of military communication industry and the like, in recent years, the overall reliability level of military equipment is greatly improved, and main reliability indexes such as mean time between failures (MTBF minimum acceptable value) of partial equipment products are in the order of thousands of hours or even higher. The high reliability index presents a significant problem in that, when reliability tests are performed according to the current standards and the regulations of acceptance programs, the time required for the reliability tests is becoming longer and longer, and the expenditure on expenses is also becoming higher and higher.
In each link of military equipment development and purchase, people generally feel that the existing equipment reliability level verification mode has higher consumption in the aspects of time, cost, manpower and the like. Especially, under the conditions of late plan issue, multiple emergency tasks and insufficient development and production acceptance periods generally existing in the current equipment development and purchase process, the reliability verification test of the equipment becomes a focus and difficult point problem in the implementation process of the development and purchase task. Reliability verification tests are not carried out, so that the reliability verification tests do not conform to the regulations, and the reliability of the equipment is doubtful to users; such tests, in turn, take a long time to perform.
In the prior art, a mode of strengthening test stress is generally adopted, and test time is reduced through a related accelerated stress test calculation method. The reliability test in the prior art is that the reliability test is a limit range of stress which can be born by a simulation device in an actual use state, and manufacturers do not have large surplus of the actual stress bearing range of the device for cost consideration, so that the reliability test cannot guarantee that the device can bear high-strength stress for a long time without failure.
Disclosure of Invention
The invention aims to solve the technical problems at least to a certain extent, provides a reliability evaluation method based on environmental stress influence factors, and solves the outstanding problems that the mean time between failures (MTBF minimum acceptable value) of part of military products is longer, and the index is poor in feasibility (long test time and high cost) after complete test verification.
The technical scheme of the invention is as follows: a reliability assessment method based on environmental stress influence factors comprises the following steps:
s1, listing names and quantities of all electronic components on equipment;
s2, classifying all electronic components on the equipment;
s3, calculating the weighted average value of the three environmental coefficients of all the components;
and S4, calculating the reliability test time through a formula.
According to the reliability evaluation method, on the basis of data such as system joint debugging, base tests and environmental tests, reliability test time is reduced through an environmental stress influence factor conversion method, and the reliability evaluation method for products with high MTBF is provided.
Further, in step S2, all electronic components on the device are classified by GJB/Z299C-2006.
Further, in step S3, a table is looked up to obtain a general ground fixed environment coefficient pi of each componentE1iCoefficient of environment outside cabinE2iEnvironmental coefficient of submarine piE3iCalculating the weighted average value of the environmental coefficients of the three types of all the components, namely the formula (1) to the formula (3), to obtain the environmental coefficient pi of the equipment in the general ground fixed environmentE1Coefficient of environment outside cabinE2Environmental coefficient of submarine piE3；
Further, in the step S4, the specific steps are as follows, the device is generally fixed on the ground by the environmental coefficient piE1Coefficient of environment outside cabinE2Divided by submarine environment coefficient piE3Can obtain common ground surface fixingThe reduction coefficients α and β of the fixed environment and the extravehicular environment relative to the submarine environment are shown as formulas (4) to (5),
the system is adjusted and the base test time T is obtained1' conversion to reliability test time T by conversion factor α1See formula (6), environmental test time T2' conversion to reliability test time T by conversion factor β2See equation (7), the sum of the two results in the total converted time TFolding deviceSee formula (8), and then the total time T of the reliability testGeneral assemblyMinus the total reduced time TFolding deviceObtaining the time T of reliability testTest ofSee formula (9);
T1＝T1' α formula (6);
T2＝T2' β formula (7);
Tfolding device＝T1+T2Formula (8);
Ttest of＝TGeneral assembly-TFolding deviceFormula (9).
Compared with the prior art, the beneficial effects are: the invention relates to a method for calculating environmental coefficients of various components; the method is a calculation method for converting other test time into reliability test time; but also a feasible reliability assessment scheme when the MTBF value of the device is large.
Drawings
FIG. 1 is a diagram of an environmental coefficient statistical case according to the present invention.
FIG. 2 is a graph of environmental folding coefficients according to the present invention.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
The environmental reduction coefficient is determined by adopting a similar comparison method, wherein the similar comparison method refers to GJB/Z299C-2006 electronic equipment reliability prediction handbook, and the environmental reduction coefficients of other tests are obtained by comparing test data of similar products or environmental coefficients of representative devices.
Taking submarine equipment as an example, the environmental conditions in the system joint debugging and the base test are a common ground fixed environment, and the environmental test is according to the environment outside a ship cabin. Converting the system joint debugging and base testing time into reliability testing time through a conversion factor of a general ground fixed environment relative to a submarine environment, converting the environment testing time into the reliability testing time through a conversion factor of an environment outside a ship cabin relative to the submarine environment, adding the reliability testing time and the reliability testing time to obtain total conversion time, and subtracting the total conversion time from the total time needing to be subjected to the reliability testing to obtain the time needing to be subjected to the reliability testing.
Specifically, the reliability evaluation method based on the environmental stress influence factor comprises the following steps:
s1, listing names and quantities of all electronic components on equipment;
s2, classifying all electronic components on the equipment;
s3, calculating the weighted average value of the three environmental coefficients of all the components;
and S4, calculating the reliability test time through a formula.
In step S2, all electronic components on the device are classified by GJB/Z299C-2006.
In step S3, the general ground fixed environment coefficient pi of each component is obtained by looking up the table respectivelyE1iCoefficient of environment outside cabinE2iEnvironmental coefficient of submarine piE3iCalculating the weighted average value of the environmental coefficients of the three types of all the components, namely the formula (1) to the formula (3), to obtain the environmental coefficient pi of the equipment in the general ground fixed environmentE1Coefficient of environment outside cabinE2Environmental coefficient of submarine piE3(ii) a An environment coefficient statistical pattern such as that shown in FIG. 1;
in step S4, the specific steps are as follows, the equipment general ground fixed environment coefficient piE1Coefficient of environment outside cabinE2Divided by submarine environment coefficient piE3The reduction coefficients α and β of the general ground fixed environment and the environment outside the cabin relative to the submarine environment can be obtained, see formulas (4) to (5), and the environment reduction coefficients are shown in figure 2.
Co-debugging the systemBase test time T1' conversion to reliability test time T by conversion factor α1See formula (6), environmental test time T2' conversion to reliability test time T by conversion factor β2See equation (7), the sum of the two results in the total converted time TFolding deviceSee formula (8), and then the total time T of the reliability testGeneral assemblyMinus the total reduced time TFolding deviceObtaining the time T of reliability testTest ofSee formula (9);
T1＝T1' α formula (6);
T2＝T2' β formula (7);
Tfolding device＝T1+T2Formula (8);
Ttest of＝TGeneral assembly-TFolding deviceFormula (9).
The system joint debugging, the base test, the environment test and the like are carried out before the reliability test of general military equipment, and the reliability test time can be reduced and the reliability of the equipment can be evaluated by the conversion method.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (4)
1. A reliability assessment method based on environmental stress influence factors is characterized by comprising the following steps:
s1, listing names and quantities of all electronic components on equipment;
s2, classifying all electronic components on the equipment;
s3, calculating the weighted average value of the three environmental coefficients of all the components;
and S4, calculating the reliability test time through a formula.
2. The reliability assessment method based on environmental stress influence factor according to claim 1, wherein: in step S2, all electronic components on the device are classified by GJB/Z299C-2006.
3. The reliability assessment method based on environmental stress influence factor according to claim 2, wherein: in step S3, a table is looked up to obtain the general ground fixed environment coefficient pi of each componentE1iCoefficient of environment outside cabinE2iEnvironmental coefficient of submarine piE3iCalculating the weighted average value of the environmental coefficients of the three types of all the components, namely the formula (1) to the formula (3), to obtain the environmental coefficient pi of the equipment in the general ground fixed environmentE1Coefficient of environment outside cabinE2Environmental coefficient of submarine piE3；
4. The reliability assessment method based on environmental stress influence factor according to claim 3, wherein: in the step S4, the specific steps are as follows, the device general ground fixed environment coefficient piE1Coefficient of environment outside cabinE2Divided by submarine environment coefficient piE3The reduction coefficients α and β of the general ground fixed environment and the extravehicular environment relative to the submarine environment can be obtained, see the formulas (4) to (5),
the system is adjusted and the base test time T is obtained1' conversion to reliability test time T by conversion factor α1See formula (6), environmental test time T2' conversion to reliability test time T by conversion factor β2See equation (7), the sum of the two results in the total converted time TFolding deviceSee formula (8), and then the total time T of the reliability testGeneral assemblyMinus the total reduced time TFolding deviceObtaining the time T of reliability testTest ofSee formula (9);
T1＝T1' α formula (6);
T2＝T2' β formula (7);
Tfolding device＝T1+T2Formula (8);
Ttest of＝TGeneral assembly-TFolding deviceFormula (9).
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| CN102789543A (en) * | 2012-07-03 | 2012-11-21 | 北京航空航天大学 | Comprehensive reliability evaluation method based on multi-test information |
| CN104459408A (en) * | 2014-12-11 | 2015-03-25 | 中国电子科技集团公司第二十研究所 | Method for verifying product reliability through temperature-stress-increased accelerated lift test |
| CN206146630U (en) * | 2016-10-24 | 2017-05-03 | 广电计量检测（天津）有限公司 | Durability combined test device |
| CN107526715A (en) * | 2017-07-26 | 2017-12-29 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | A kind of reliability estimation method and device |
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