Genesis of dependability of unique safety critical systems
https://doi.org/10.21683/1729-2646-2016-16-3-47-53
Abstract
Purpose. This article offers to focus on the genesis of dependability of unique safety critical systems specified by low probability of failures, using the example of transformable structures of spacecrafts, in relation to which just the possibility of failures can question the reasonability of their creation. It describes the stage of the life cycle of unique mission critical systems at which the measures taken to improve reliability are the most effective, and the stages at which it is already late to take any measures at all. Methods. Neglecting the genesis of unique mission critical systems will inevitably lead to failures at the stage of operation, and the failures are caused by errors in design, engineering, modeling, as well as by different manufacturing deviations. In practice up to 80% of cases are predetermined before the start of operation - “at a drafting machine” and in manufacturing departments, when something was not thought through, taken into account and controlled, making an error or foozling. Reliability of future products depends on the quality of the decisions taken under development, which directly depend on the principles, rules and requirements used under design and engineering. These notions are interrelated, they have a concrete meaning. Principles are used to develop design solutions. Rules are intermedia between theory and practice, they often reflect the gained experience that should be considered in new developments to avoid repeating the errors. Reliability requirements at the stage of engineering are formed as the result of application of goal-oriented procedures and analyses, being established in graphic and text form in design documentation: in technical requirements and on a draft, as well as in technical specification. Satisfying these requirements is finally aimed at undoubted performance by a product of its functional tasks with predetermined reliability. Results. The aspects described in the article, separate the methods of reliability theory which are based on probabilistic and statistical models, with practical engineering methods aimed at the creation of reliable equipment. The field of reliability theory covers the study of behavior of finished products, proceeding from the information about mathematical models that consider stochastic parameters. Real objects in reliability theory are schematized to the models described by probabilistic dependences and having a sampling that can be used for statistical generalization. In practice though, engineers work having no statistics and concepts of probabilistic behavior of a future product, and the collection of methods and algorithms of its operation makes it possible to influence the reliability of real products. Conclusion. This paper shows that the stages of a life cycle of unique safety critical systems before the stage of operation are strictly differentiated by the efficiency of reliability measures. At each stage it is necessary to use certain reliability algorithms and methods that are specific to this particular stage, which may increase the effectiveness when solving the tasks of reliability of unique safety critical systems.
About the Authors
Yu. P. PokhabovRussian Federation
Yury P. Pokhabov, PhD Engineering, Chief of Engineering Innovative Center
O. K. Valishevsky
Russian Federation
Oleg K. Valishevsky, Leading engineer in the lab of transformable structures,
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Review
For citations:
Pokhabov Yu.P., Valishevsky O.K. Genesis of dependability of unique safety critical systems. Dependability. 2016;16(3):47-53. https://doi.org/10.21683/1729-2646-2016-16-3-47-53