Method for evaluating the shelf-life indicators for on-board equipment of surface-to-air missiles during periodic inspections of their operability
- Authors
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Igor Koval
Ivan Kozhedub Kharkiv National Air Force University
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- Keywords:
- Array, Array, Array, Array, Array, Array
- Abstract
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Modern surface-to-air missiles (SAM), as a rule, are products that are not fi re-tested during service life. Such missiles, from the point of view of reliability, are characterized by reliability and shelf life. Usual approach to verify the missiles that are not tested is to make periodic selective inspections of their on-board equipment operability. Such verifi cations are performed while extending the assigned service life indicators. This verifi cation provides only information on the number of products that failed, while the moments of failure occurrence are unknown. The latter means that there is an interval uncertainty regarding exact moments when these failures occurred. The article proposes a method for assessing the operability of airborne equipment of surface-to-air missiles and other components with interval uncertainty, which is due to selective periodic operability checks. Main features of the method are: preliminary estimation of the empirical distribution function; plotting the dependence of the accumulated failure rate on the duaration of storage and its extrapolation to a time interval that is limited by entire shelf life of products; obtaining the inverse function for calculating the duration of storage of products to failure. Such dependence of accumulated failure rate upon the shelf-life duration corresponds to the restored distribution function. This method eliminates the interval unacertainty of the moments of failure due to restoration of the distribution function using nonparametric methods. Assessment accuracy of the shelf life indicators, which are calculated in accordance with the proposed method, are verified by comparing the estimates calculated by this method with the reference estimates, which are calculated under the assumption that the distribution law of the storage time of the products to failure is known. We used computer to simulate the tests for shelf life performance of products by means of generating the sample of durations of storage to failure using the well-known Weibull distribution function. Based on the simulated sample data, we set up initial data regarding the number of products to have necessary storage to failure durations. These initial data were collected on the observation interval given the three options, as if these data were obtained from actual tests. Parametric assessment of shelf life indicators was carried out. The results of modeling and calculating the accuracy of the estimation of indicators of residual shelf life are presented. The method developed here allows obtaining estimates of these indicators with acceptable errors. This method requires selective periodic inspections of products that should be planned as part of the work program to extend the assigned service life indicators.
The method can be used to evaluate the shelf life performance of not only onboard equipment of missiles, but also of other missile’s components, technical condition of which is not checked during service life. - Author Biographies
- References
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- Published
- 2020-06-26
- Section
- AIR DEFENSE SYSTEMS
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Copyright (c) 2020 Борис Миколайович Ланецький, Ігор Вікторович Коваль, Валерій Петрович Попов, Валерій Іванович Гриневич
This work is licensed under a Creative Commons Attribution 4.0 International License.
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