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Tytuł:
Substation reliability evaluation in the context of the stability prediction of power grids
Autorzy:
Borecki, M.
Ciuba, M.
Kharchenko, Y.
Khanas, Y.
Powiązania:
https://bibliotekanauki.pl/articles/199826.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
reliability
power grid
risk analysis
substation
Opis:
The aim of the presented work was to examine the reliability assessment model on the example of a selected power grid object. The analyzed object was tested based on assumptions about technological breaks that were caused by overvoltage, among others. The study was conducted to check the reliability of integral elements of the power grid object and to assess the change in reliability level as a function of the frequency of inspections. The test results are to determine the optimal frequency of inspections of individual power grid objects in order to increase its reliability. In addition, the possibility of correlating optimal inspection periods resulting from the findings of this paper with periodic inspections of power network facilities was assessed.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 4; 769-776
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance assessment of industrial system (African Textile Manufacturers, LTD) through copula linguistic approach
Autorzy:
Abubakar, Muhammad Idris
Singh, Vijay Vir
Powiązania:
https://bibliotekanauki.pl/articles/406421.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
availability
reliability
MTTF
cost analysis
supplementary variable
Opis:
This paper deals with the performance assessment of a textile industry, namely African Textile Manufactures (ATM) Ltd., in Chalawa, Kano industrial estate, Federal Republic of Nigeria. The entire system ATM has different sections of machines for processing various assignments. The machines in the sections have diverse capabilities. We assumed the following subsystems: spinning, weaving, pretreatment, printing, and steaming. The failure rates of subsystems are constant, and they follow exponential distribution, while the repairs follow two types of distributions, namely general distribution and Gumbel–Hougaard family copula distribution. The system analyzed by employing supplementary variable and the Laplace transform. Various measures of reliability have been computed for differential values of failures and two types of repair. The conclusions and some recommendations are addressed to improving the management of ATM.
Źródło:
Operations Research and Decisions; 2019, 29, 4; 5-22
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A copula-based method for reliability sensitivity analysis of structural system with correlated failure modes
Oparta na pojęciu kopuły metoda analizy czułości niezawodnościowej systemu konstrukcyjnego o skorelowanych przyczynach uszkodzeń
Autorzy:
Hao, L.
Zhencai, Z.
Powiązania:
https://bibliotekanauki.pl/articles/301567.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
reliability
reliability sensitivity
correlation analysis
copula
niezawodność
czułość niezawodnościowa
analiza korelacji
kopuła
Opis:
Despite many advances in the field of computational reliability analysis, the efficient estimation of the reliability and reliability sensitivity analysis of structural systems with multiple failure modes remains a persistent challenge. The key to deal with the problem lies in the correlation modelling between failure modes. In this paper, the Archimedean copulas are used as an alternative to solve the high-dimensional dependence modeling problem. The probability characteristics of failure modes are described by stochastic perturbation technique, and the reliability index is estimated with the fourth-moment standardization method. Considering that the number of the potential failure modes of the structural systems are relatively large, the probabilistic network evaluation technique is adopted to reduce the computational complexity. The sensitivity analysis is then conducted using the matrix differential technology. The numerical examples show that the applied procedure is able to efficiently consider various failure modes of structural systems in probabilistic assessment and sensitivity analysis.
Mimo poważnych osiągnięć w dziedzinie komputerowej analizy niezawodności, skutecznaocena niezawodności i analiza czułości niezawodnościowej systemów konstrukcyjnych o wielu przyczynach uszkodzeń pozostają ciągłym wyzwaniem. Kluczem do rozwiązania problemu jest modelowanie korelacji między przyczynami uszkodzeń. W niniejszym artykule zastosowano kopuły Archimedesa jako alternatywny sposób rozwiązania problemu modelowania zależności wysoko wymiarowych. Charakterystyki prawdopodobieństwa dla przyczyn uszkodzeń opisano przy pomocy metody zaburzeń stochastycznych, zaś wskaźnik niezawodności oszacowano metodą standaryzacji momentu czwartego rzędu. Biorąc pod uwagę, że liczba potencjalnych przyczyn uszkodzeń systemów konstrukcyjnych jest stosunkowo duża, wykorzystano technikę oceny z zastosowaniem sieci probabilistycznych, która pozwala na zmniejszenie złożoności obliczeniowej. Następnie przeprowadzono analizę czułości przy użyciu metody macierzy równań różniczkowych. Przykłady liczbowe pokazują, że zastosowana procedura pozwala na skuteczną ocenę różnych przyczyn uszkodzeń systemów konstrukcyjnych w ramach oceny probabilistycznej oraz analizy czułości.
Źródło:
Eksploatacja i Niezawodność; 2015, 17, 3; 450-456
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measuring Teachers’ Reflection: Development and Validation of a Reflective Teaching Test
Autorzy:
Moghaddam, Rokhsareh Ghorbani
Powiązania:
https://bibliotekanauki.pl/articles/24964665.pdf
Data publikacji:
2023-12-31
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
reflective teaching
test
factor analysis
reliability
validity
Opis:
As the importance of reflective teaching is increasingly acknowledged, the need for its assessment is seen more essential. This study designed and validated a scale measuring reflective teaching in an EFL context. In doing so, a test comprising of 24 scenarios in a multiple-choice format was developed and administered to 120 Iranian EFL teacher participants. The scale’s reliability was obtained to be 0.75 using Cronbach’s alpha. In order to determine the construct validity of the tentative test, it was subjected to a series of factor analysis. The findings showed that the newly designed test could be used to measure reflective teaching. Some implications were suggested in the context of language teaching.
Źródło:
The New Educational Review; 2023, 74; 89-111
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of an innovative approach for complex, causally determined failure chains
Autorzy:
Bielefeld, O.
Dransfeld, H.
Schlüter, N.
Winzer, P.
Powiązania:
https://bibliotekanauki.pl/articles/407289.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
model-based failure analysis
reliability
quality
safety
Opis:
A high number of examples in today’s global industry prove that it is difficult to ensure a certain level of quality. One possible reason is the increasing complexity of modern mechatronic product systems. Interface problems due to several involved science disciplines and the lack of understanding subsystems, which are delivered by different suppliers, make it difficult to identify critical components and specifications of elements. Furthermore, it is even harder to estimate the effects of elements because of their unknown dependencies and relations. Therefore it becomes more and more improbable to develop a safe, sustainable and high quality product right from the beginning. In order to understand failures in complex system structures today’s engineering industries need a generic approach that increases the understanding of systems, identifies critical components and considers the different levels of a system. It shall examine failures that cause system errors but also failures that limit system functions. Thus, it is necessary to model and simulate the causally failure chains and analyse over several system levels and elements with their dependencies. This leads to a better understanding of the whole picture of cause and effect. This research paper points out which requirements this new model-based approach has to fulfill and how it is possible to link quality and reliability methods to achieve an overall understanding and analysis of a complex system to assure high quality and sustainability.
Źródło:
Management and Production Engineering Review; 2017, 8, 3; 3-12
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fault Tree Analysis as a tool for modelling the marine main engine reliability structure
Autorzy:
Laskowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/135108.pdf
Data publikacji:
2015
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
Fault Tree Analysis (FTA)
main engine
reliability
weak link
Reliability Block Diagram (RBD)
qualitative analysis
minimal cut sets
Opis:
The introduction to the Fault Tree Analysis has been presented in this article. Selected publications on the Fault Tree Analysis have been listed. The usefulness of the method in marine engineering application has been indicated. Reliability testing facility has been presented, that is typical two-stroke, slow-speed ship crosshead Diesel engine intended to power the ship. The way of creating system model with the Fault Tree Analysis application has been presented. Reliability structure of tested engine has been modelled using Reliability Block Diagrams, as well as the Fault Tree Analysis. Main tree describing the object reliability structure analysis and the sub-tree structure modelling crank system, subsystem of the cam shaft, cylinder exemplary system and turbocharger have been built. Qualitative analysis of the tree has been conducted – the minimal cut sets of the system has been determined. The directions for further research have been indicated.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2015, 41 (113); 71-77
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Risk analysis in maintenance processes
Autorzy:
Drożyner, Przemysław
Powiązania:
https://bibliotekanauki.pl/articles/1818983.pdf
Data publikacji:
2020
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
risk analysis
maintenance
reliability
analiza ryzyka
konserwacja
niezawodność
Opis:
The article aims to present practical methods for prioritising the activities of maintenance departments based on the Pareto analysis and the failure risk analysis. Based on the collected data on the number of observed failures and their removal times, commonly known reliability indicators were determined, which were then used to estimate the probabilities and consequences of failures in terms of the risk of loss of production continuity. Based on commonly collected failure data, the developed methods allow proposing to the maintenance departments the sequence of maintenance and repair work to be undertaken in terms of minimising the risk of failure. Risk analysis is somewhat commonly used in the practice of maintenance departments (e.g. RBI, FMEA, ETA, FTE, HIRA). The added value of this work is the use of reliability indicators for estimating the values of risk components, i.e., probability and consequences. The method was developed on the basis of operational data collected in one of the plants of the dairy cooperative and, after assessing the effects of its implementation, it was implemented in other enterprises of the cooperative.
Źródło:
Engineering Management in Production and Services; 2020, 12, 4; 64--76
2543-6597
2543-912X
Pojawia się w:
Engineering Management in Production and Services
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Workplace Bullying Scale: The Study of Validity and Reliability
Autorzy:
Doğar, Nizamettin
Powiązania:
https://bibliotekanauki.pl/articles/1036527.pdf
Data publikacji:
2015
Wydawca:
Academicus. International Scientific Journal publishing house
Tematy:
workplace bullying
validity
reliability
translation
confirmatory factor analysis
Opis:
The aim of this research is to adapt the Workplace Bullying Scale (Tınaz, Gök & Karatuna, 2013) to Albanian language and to examine its psychometric properties. The research was conducted on 386 person from different sectors of Albania. Results of exploratory and confirmatory factor analysis demonstrated that Albanian scale yielded 2 factors different from original form because of cultural differences. Internal consistency coefficients are,890 -,801 and split-half test reliability coefficients, 864 -,808. Comfirmatory Factor Analysis results change from,40 to,73. Corrected item-total correlations ranged,339 to,672 and according to t-test results differences between each item’s means of upper 27% and lower 27% points were significant. Thus Workplace Bullying Scale can be use as a valid and reliable instrument in social sciences in Albania.
Źródło:
Academicus International Scientific Journal; 2015, 11; 97-105
2079-3715
2309-1088
Pojawia się w:
Academicus International Scientific Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Statistical analysis of interval and imprecise data : applications in the analysis of reliability field data
Autorzy:
Hryniewicz, O.
Powiązania:
https://bibliotekanauki.pl/articles/2069621.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
reliability
statistical analysis
field data
interval data
fuzzy data
Opis:
The analysis of field lifetime data is much more complicated than the analysis of the results of reliability laboratory tests. In the paper we present an overview of the most important problems of the statistical analysis of field lifetime data, and present their solutions known from literature. When the input information is partial or imprecise, we propose to use interval arithmetics for the calculation of bounds on reliability characteristics of interest. When this information can be described in a more informative fuzzy form, we can generalize our interval-valued results to their fuzzy equivalents.
Źródło:
Journal of Polish Safety and Reliability Association; 2007, 1; 181--192
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimisation of reliability and maintenance plan of the high-pressure fuel pump system on marine engine
Autorzy:
Knežević, Vlatko
Stazić, Ladislav
Orović, Josip
Pavin, Zoran
Powiązania:
https://bibliotekanauki.pl/articles/32898209.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
reliability
maintenance modification
high-pressure fuel pump
risk analysis
Opis:
This paper presents a method of adjusting and designing the maintenance scheme for the high-pressure fuel pumps of a slow-speed two-stroke marine engine, MAN 6S70MC-C. The maintenance database for the marine fuel system was obtained from the planned maintenance software, and covered a period of 11 years. During this period, 29 failures occurred that required corrective actions. Our methodology includes failure mode analysis, risk analysis, reliability calculation and maintenance interval adjustment. Each failure is described using a failure mode analysis, based on a combination of the mode and cause of failure. The objective of this study is to recommend a new preventive maintenance interval based on the exponential reliability results and the analysed maintenance data. The initial maintenance plan for each fuel pump was set to 8,000 running hours, whereas in the modified plan, it is recommended to set this to 4,000 hours. Our results show an increase in the system reliability from 60% to 95% when the new modified maintenance plan is applied. In addition, the results and the recommended initial maintenance schedule are validated based on three similar types of engine with the same fuel pump system. The new maintenance approach can reduce the risk of component failure, which will lead to increased reliability of the fuel pump system and the optimisation of maintenance costs.
Źródło:
Polish Maritime Research; 2022, 4; 97-104
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence analysis of detonations related to output characteristics and to damage level of engine parts in order to eliminate potential risks and ensure reliability of the HCCI technology
Autorzy:
Puškár, M.
Kopas, M.
Puškár, D.
Powiązania:
https://bibliotekanauki.pl/articles/198699.pdf
Data publikacji:
2019
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
analysis
detonation
reliability
HCCI technology
analiza
detonacja
niezawodność
technologia HCCI
Opis:
The engine output characteristic offers very important information during the real application of the HCCI technology. This kind of combustion process significantly influences the wearing degree of the main engine components or even the engine damage. The principle of the HCCI combustion is basically beneficial, however, it can also be destructive. Described in this article are measurements of the engine output characteristics in the case of an experimental piston combustion engine. These measurements were performed by means of a data recording system, whereby the detonation combustion was evaluated using a quantitative method. The real values of atmospheric conditions and fuel mixture composition were added to the measured values. The resulting values were visually compared with a degree of the engine piston damage caused by the detonations. The final result is a limit value, which represents a maximal number of the detonation units that are permissible in order to ensure reliable operation of the HCCI engine.
Źródło:
Zeszyty Naukowe. Transport / Politechnika Śląska; 2019, 102; 151-163
0209-3324
2450-1549
Pojawia się w:
Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of environmental, ergonomic factors and properties of operators on the reliability of ships propulsion systems
Autorzy:
Frąckowiak, W.
Powiązania:
https://bibliotekanauki.pl/articles/247900.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
propulsion system
operator
reliability
analysis
operator functions
Performance Shaping Factor
Opis:
Analyzing the systems in terms of reliability, we often treat them as the technical objects only, omitting human interaction or assuming that operator has constant characteristics. This significantly distorts the results obtained in this way, since human is a part of the system with special properties that can change together with the predisposition of the operator and the conditions under which he operates. These attributes may have a major influence on the reliability of the systems. Therefore, analysis of systems reliability should include a reliability of operator and its properties. In this paper presented the antropotechnical reliability structure based on selected installation, which is a part of ships propulsion system. Also operator’s functions were defined and the analysis of human reliability, taking into account various properties of the operator and the external conditions, were performed. Then, there is assessed the influence of operator and environmental factors on the value of the entire system reliability. The study used the reliability data of the container ship propulsion system equipped with low-speed piston engine, fixed pitch propeller and auxiliary installations. These data were obtained from studies of expert judgments (Brandowski A., Frąckowiak W. et al.) in the years 2007–2009. For HRA (human reliability analysis), HEART technique (Human Error Assessment and Reduction Technique) was used, together with the human unreliability values and correction factors developed by the authors of this method. Study results illustrate influence of environmental, ergonomic factors and the properties of the operator on the reliability of the antropotechnical systems. The studies were subjected exemplification on fuel treatment installation as a part of ships propulsion systems.
Źródło:
Journal of KONES; 2012, 19, 2; 145-151
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and numerical simulation of the new design of the gripper for manipulating of the rotational parts
Autorzy:
Basova, Y.
Nutsubidze, K.
Ivanova, M.
Slipchenko, S.
Kotliar, A.
Powiązania:
https://bibliotekanauki.pl/articles/327310.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
gripper
kinematics
computer analysis
reliability
chwytak
analiza komputerowa
kinematyka
niezawodność
Opis:
The analysis of the field of application of gripper is carried out. Are allocated perspective areas of development of a robotics. The main difficulties in the application of kinematic schemes for gripping devices with rotary finger movement are described. The prospective application of the kinematic scheme of the gripper with a straight-parallel plane-parallel motion of the fingers is proved when manipulating an object of the "shaft" type. A new scheme of a gripper with a rectilinear plane-parallel finger movement is presented. Its design is simpler and cheaper than known devices of this type. The capability of the gripper design in the engineering analysis environment has been fulfilled. Numerous computer studies of both individual design elements and pairs of objects that are in interaction have confirmed the operability of the developed design. It is established that the frictional force in the mobile components of the gripper design is insignificant, which will not create the prerequisites for a significant increase in size.
Źródło:
Diagnostyka; 2018, 19, 4; 11-18
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reliability, availability, and maintainability analysis of the propulsion system of a fleet
Autorzy:
Bayraktar, Murat
Nuran, Mustafa
Powiązania:
https://bibliotekanauki.pl/articles/24202522.pdf
Data publikacji:
2022
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
ship propulsion system
reliability
availability
maintainability
RWB software
RAM analysis
Opis:
New systems are produced and developed to meet specific needs, and their reliability is the most important issue. In the maritime industry, evaluating failures in a ship’s propulsion system results in high costs and the loss of prestige for the company. Land/sea fleet employees need to detect and minimize the failures that may occur in ship propulsion systems in advance to ensure the continuity of the ships’ operations. In this study, the recorded failure data of four different ships belonging to a fleet in the last 10 years are used. Failures were examined as a whole since the ships have similar propulsion systems. The obtained failure data were grouped, and the average time to fix the failures was determined by the chief engineer and made suitable for reliability, availability, and maintainability (RAM) analysis. A suitable model was created for grouped failures by Isograph’s RWB software. As a result of the analysis of the propulsion system and its subsystems, the main engine of the ship was shown to have the best reliability. Furthermore, the most important components were the cylinders of the main engine as subsystems. This study highlights the components that are important to the reliability of a propulsion system. Thanks to the RAM analysis, improvements can be pinpointed on a ship’s propulsion system, which will increase the operations of the maritime industry. Reducing failures will further increase the confidence in maritime transport and strengthen its place among the modes of transportation. This study provides a valuable resource for academicians, experts, as well as companies working on reliability, availability, and maintainability in the future.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2022, 70 (142); 63--70
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Issledovanie nadezhnosti slozhnykh tekhnicheskikh sistem 'chelovek-mashina' metodom grafov
Study reliability of complex technical system that 'man-machine' graph method
Autorzy:
Novickijj, A.
Powiązania:
https://bibliotekanauki.pl/articles/77627.pdf
Data publikacji:
2014
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
machine
man-machine system
reliability
technical system
stochastic model
systematic analysis
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2014, 16, 3
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
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