Improving the accuracy of calculating the reliability indicators of electrical equipment for aviation purposes by refinement the calculation parameters

2020 ◽  
Author(s):  
Flyur Ismagilov ◽  
Vyacheslav Vavilov ◽  
Ruslan Karimov ◽  
Oxana Yushkova ◽  
Alexander Timofeev
Keyword(s):  
Electrical Equipment ◽  
Reliability Indicators

scholarly journals Reliability Analysis in Planning of Traction Substation Reconstruction Based on Fuzzy Set Theory

2020 ◽  
pp. 52-62
Author(s):  
Vladislav G. Belov ◽  
Vladimir A. Tremyasov
Keyword(s):  
Set Theory ◽  
Fuzzy Set ◽  
Fuzzy Set Theory ◽  
Fuzzy Numbers ◽  
Probabilistic Method ◽  
Reliability Assessment ◽  
Electrical Equipment ◽  
Triangular Fuzzy Numbers ◽  
Traction Substation ◽  
Reliability Indicators

The study proposes a probabilistic method using triangular fuzzy numbers to analyze the reliability of the traction substation. With this approach, the reliability assessment of the traction substation can be performed considering changes in the values of reliability indicators of electrical equipment, determined on the basis of the fuzzy set theory

scholarly journals Calculation integral reliability indicator of the urban electric transport traction electrical equipment

2021 ◽  
Vol 7 (1) ◽  
pp. 71-84
Author(s):  
Ruslan S. Litvinenko ◽  
Aver E. Auhadeev ◽  
Khak T. Le ◽  
Gamal R. Akhsaniev
Keyword(s):  
Electrical Equipment ◽  
Electric Transport ◽  
Analysis Method ◽  
Reliability Indicators ◽  
Multicriteria Problems ◽  
Reliability Indicator ◽  
Hierarchy Analysis ◽  
Complex Technical System ◽  
Complex Technical Systems ◽  
Integral Indicator

When reliability requirements at the stage of developing complex technical systems are setting, the total number of individual and complex reliability indicators set in accordance with regulatory documents is within 5-7 units. This is done provided that they are recoverable, and also for them the requirements for durability and preservation are determined. All this determines the complexity of the procedure for their verification, confirmation and evaluation. Aim: Formation of a common (integral) indicator of reliability, which can characterize the basic reliability properties multitude of traction electrical equipment, as a complex technical system, subject to the compliance of individual indicators with the requirements specified in the terms of reference. Methods: It is proposed to use of T. Saati's hierarchy analysis method, which is widely used in solving various multicriteria problems. Conclusion: Using an integral indicator to determine the level of reliability allows getting a formalized result, expressed through the vectors of global priorities corresponding value, which makes it possible to get a quantitative assessment of the superiority for one of alternative traction electrical equipment.

scholarly journals Implementation of the control algorithm of the traction electric equipment

2021 ◽  
Vol 2061 (1) ◽  
pp. 012135
Author(s):  
D A Lysenko ◽  
V Yu Konyukhov ◽  
N P Astashkov
Keyword(s):  
Control Algorithm ◽  
Statistical Data ◽  
Dielectric Strength ◽  
Electrical Equipment ◽  
Technical Condition ◽  
Sharp Drop ◽  
Reliability Indicators ◽  
Electric Equipment ◽  
Electrical Part ◽  
The Impact

Abstract Currently, in various fields of science and technology, there is a fairly large number of methods for predicting reliability indicators, which differ in the set of tasks to be solved and the features of the mathematical apparatus used. When developing a methodology for calculating the reliability of an electric machine, one of the main stages is the development of a mathematical model, in which it is possible to take into account the factors, the impact of which directly affects the technical condition and the level of operational safety. Taking into account the disturbing influences during the implementation of the technological process is possible provided that the means of automation are used. The performed analysis of statistical data on traction motor failures made it possible to substantiate the advisability of warming up, since a significant number of electrical part failures occur in the autumn - winter - spring periods of time. This feature of the distribution of failures is to a certain extent due to the direct wetting of the insulation and a decrease in its dielectric strength. This process is associated with a sharp drop in external and internal temperatures when placing the locomotive at the depot, which contributes to the appearance of condensate on the insulation, its further destruction. The measure proposed in the article for warming up traction electrical equipment is aimed at an integer reduction in the failures of the electrical part of the electric motors under consideration.

ASSESSMENT OF THE CONDITION OF HIGH-VOLTAGE ELECTRICAL EQUIPMENT OF THE MULTI-LEVEL POWER SUPPLY SYSTEM OF THE SHOPS OF THE PRODUCTION METALLURGICAL LINE

2021 ◽  
Vol 3 (1) ◽  
pp. 054-057
Author(s):  
Yu. N. KONDRASHOVA ◽  
◽  
I. V. NOVIKOV ◽  
A. M. MARKIN ◽  
◽  
...  
Keyword(s):  
High Voltage ◽  
Power Supply ◽  
Power Supply System ◽  
Electrical Equipment ◽  
Technical Condition ◽  
Supply System ◽  
Power Lines ◽  
Reliability Indicators ◽  
Multi Level ◽  
Cable Lines

The paper analyzes damage along overhead and cable power lines. The calculation of the main indicators of reliability is carried out to predict the value of the actual resource of the main high-voltage electrical equipment for the shops of the production metallurgical line. The calculations were performed for the existing circuit using the software package [1]. The performed analysis of the obtained results of the developed algorithm and methods for calculating reliability indicators made it possible to assess the technical condition of overhead and cable lines subject to intense aging in terms of voltage levels and to estimate the number of outages at nodal substations.

Improvement of the Methodology for Determining Reliability Indicators of Oil and Gas Equipment

2018 ◽  
Vol 11 (1) ◽  
pp. 37 ◽  
Author(s):  
Vladimir Bukhtoyarov ◽  
Vadim Tynchenko ◽  
Eduard Petrovskiy ◽  
Valeriya Tynchenko ◽  
Vadim Zhukov
Keyword(s):  
Oil And Gas ◽  
Reliability Indicators

Validation to Spanish version of the COVID-19 Stress Scale

2020 ◽  
Author(s):  
Edgar Guillermo Pulido
Keyword(s):  
Mental Health ◽  
Goodness Of Fit ◽  
National Sample ◽  
Mitigation Strategies ◽  
Dimensional Structure ◽  
Psychosocial Effects ◽  
Stress Scale ◽  
Global Consensus ◽  
Reliability Indicators ◽  
Effective Assessment

There is a global consensus about the potential of the COVID-19 pandemic to affect people's mental health. In this context, and prior to the formulation of mitigation strategies, tools are required that allow an objective and effective assessment of mental health risk. The purpose of this study was to evaluate the psychometric characteristics of COVID-19 Stress Scale, formulated by Taylor et al. (2020), based on the concept of COVID-19 Stress Syndrome. A national sample of 1214 participating adults was taken in Colombia, who answered a translated version of the scale. Evidence of a hexa-dimensional structure was obtained whose goodness of fit indicators were Chi2 = 1215,759, Sig. =. 000, CMIN / DF = 2.202, RMSEA = .044, NFI = .943, TLI = .964, CFI =. 968 and FMIN = 1,967. Regarding reliability, an α = .924 and Spearman-Brown = .824 were obtained for the entire scale; the reliability indicators of the 6 subscales were also high. The similarities and differences in the findings with respect to the original psychometric study of the scale are discussed, as well as the utility and importance of the instrument as a tool in future efforts to mitigate the psychosocial effects of the pandemic.

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