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Wyświetlanie 1-15 z 41
Tytuł:
Peculiarities of technical object’s safety level evaluation
Autorzy:
Korostil, J.
Powiązania:
https://bibliotekanauki.pl/articles/360587.pdf
Data publikacji:
2014
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
risk
safety
model
environment
malfunction
technical object
Opis:
In this work is developed method of evaluation safety level, which decreases with floating intensity functioning during technical object. Factors, condition such changes were reviewed. Basing on proposed methodic of detection of various types of risks exists possibility to form constructive algorithms of evaluation of safety level, which allows forming adequate danger counteraction means. One of basic factors, representing dangers, is malfunctions, appearing on technical object.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2014, 40 (112); 100-104
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The genetic fuzzy based proactive maintenance of a technical object
Autorzy:
Smoczek, J.
Szpytko, J.
Powiązania:
https://bibliotekanauki.pl/articles/246817.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
proactive maintenance
failure prediction
fuzzy logic
genetic algorithm
Opis:
The proactive maintenance is an effective approach to enhance the system availability through real time monitoring the current state of a system. The key part of this method is forecasting the nonoperational states for advanced warning of the failure possibility that can bring the attention of machines operators and maintenance personnel to impending danger facilitate planning preventive and corrective operations, and resources managing as well. The paper presents the HMI/SCADA-type application used to support decision-making process. The proposed approach to proactive maintenance is based on forecasting the remaining useful life of device equipment and delivering the user-defined maintenance strategy developed during system operation. The HMI/SCADA application is used to collect data in form of failures history, changes of operational conditions and performances of a monitored process between failures, as well as heuristic knowledge about process created by experienced user. The data history is used to design the predictive fuzzy models of time between failures of system equipment. The fuzzy predictive models are designed using the genetic algorithm applied to optimize the fuzzy partitions covering the training data examples, as well as to identify fuzzy predictive patterns represented by a set of rules in the knowledge base. The evolutionary learning strategy, which has been proposed in this paper, provides the effective reproduction techniques for searching the solution space with respect to optimization of knowledge base and membership functions according to the fitness function expressed as a ratio of compatibility of fuzzy partitions with data examples to root mean squares error. The proposed application was created and tested on the laboratory stand for monitoring the availability of the overhead travelling crane.
Źródło:
Journal of KONES; 2012, 19, 3; 399-405
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technical object environment signals and its elimination from diagnostic model
Autorzy:
Golak, K.
Grądzki, R.
Lindstedt, P.
Powiązania:
https://bibliotekanauki.pl/articles/246588.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
diagnostic
models
environment
compressor blades
oil pipelines
Opis:
Diagnostics of many common technical objects (compressor blades, oil pipelines) has been noticed to be realized mostly on the basis of measured diagnostic signals resulting from object operation without sufficient consideration given to usually difficult to measure signals of its environment. Such approach is inconsistent with basic rule of diagnostics that strictly orders research and analysis of technical condition in environment (PN-90/N-04002). Hence many works occurred concerning diagnostics of technical objects (e.g. compressor blades – in motion and in repose), characterized by the fact, that environment signals are taken into consideration without necessity of measuring them [2-7]. A necessity exists to elaborate new object diagnostic methods in repose and in operation including environment but without need (if possible) of using frequently unavailable or difficult to measure environment signals. This problem is solved by diagnostic methods based on diagnostic models allowing, through special operations, for elimination of real environment. Elimination of environment from model is possible as an effect of proper conduct of diagnostic research that in base form should include measurement of environment and diagnostic signals. In models A2 T12T01 and φT12T01 dependence on environment does not occur. Hence each change of model must be interpreted only as change of object technical condition. Such models might be applied for various objects operating in complex environments (eg. oil pipelines, bearings, etc.).
Źródło:
Journal of KONES; 2013, 20, 2; 121-126
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Time between inspections optimization for technical object with time delay
Autorzy:
Jodejko-Pietruczuk, A.
Nowakowski, T.
Werbińska-Wojciechowska, S.
Powiązania:
https://bibliotekanauki.pl/articles/2069363.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
delay-time modelling
single-unit system
Opis:
In the presented paper, authors are concerned with a single-element system liable to costly failure. Failure is taken here to mean a breakdown or catastrophic event, after which the system is unusable until repaired or replaced. The mathematical modelling of maintenance decisions for such a system is provided with the use of delay-time and delay-time analysis. The directions for further research work are defined.
Źródło:
Journal of Polish Safety and Reliability Association; 2013, 4, 1; 35--42
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Availability of a technical object determined in a finite time interval
Autorzy:
Woropay, M.
Migawa, K.
Bojar, P.
Szubartowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/247070.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
transport system
operation process
semi-Markov model
availability
Opis:
In the article, a method for determination of the technical object availability, GO (r) in a finite time interval x, defined by the time of the transport task duration, has been discussed. All of the study has been presented on the example of a selected system of technical object operation - a system of transport means operation, in a big urban complex (more than 400 thousand inhabitants). Direct performance of the transport tasks in the analyzed system is the responsibility of an executive system consisting of elementary subsystems of the type operator- transport means. Availability of transport means elementary subsystems is crucial for efficient accomplishment of transport tasks. The presented method involves determination of the technical object availability, on the basis of a mathematical model of the operation process which takes place in the studied system, taking into consideration the technical object reliability characteristics. For this purpose, significant states of the transport means operation have been determined and they have been classified in terms of the availability criterion. Basing on this, an event and mathematical models of transport means operation process have been developed, with the semi Markov homogenous model serving as a mathematical model of the studied operation process. Also, values of the analyzed characteristics have been determined.
Źródło:
Journal of KONES; 2011, 18, 4; 555-562
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A family of new generation miniaturized impedance analyzers for technical object diagnostics
Autorzy:
Hoja, J.
Lentka, G.
Powiązania:
https://bibliotekanauki.pl/articles/220894.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
technical object diagnostics
impedance spectroscopy
impedance analyzer
Opis:
The paper presents the family of three analyzers allowing to measure impedance in the range of 10 Ω<|Zx|<10 GΩ in a wide frequency range from 10 mHz up to 100 kHz. The most important features of the analyzer family are: miniaturization, low power consumption, low production cost, telemetric controlling and the use of an impedance measurement method based on digital signal processing (DSP). The miniaturization and other above-mentioned features of the analyzers were obtained thanks to the use of the newest generation of large-scale integration chips: e.g. "system on a chip" microsystems (AD5933), 32-bit AVR32-family microcontrollers and specialized modules for wireless communication using the ZigBee standard. When comparing metrological parameters, the developed instrumentation can equal portable analyzers offered by top worldwide manufacturers (Gamry, Ivium) but outperforms them on smaller dimensions, weight, a few times lower price and the possibility to work in a distributed telemetric network. All analyzer versions are able to be put into medium-volume production.
Źródło:
Metrology and Measurement Systems; 2013, 20, 1; 43-52
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The technical object reliability evaluation based on the parametric and momentary failures
Autorzy:
Lindstedt, P.
Manerowski, J.
Borowczyk, H.
Powiązania:
https://bibliotekanauki.pl/articles/242760.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
reliability
Weibull function
parametric failure
momentary failure
Opis:
The presented paper concerns with the technical object reliability evaluation based on the parametric and momentary failures during the process of object operating. The real world data observation shows that in the case of high quality technical objects the catastrophic failure events are too rare to the credible evaluation of the object’s reliability. For that reason, the parametric and momentary failures are in the centre of attention in this paper. The set of analysed failures was obtained with the classifiers of the field data provided by the monitoring system (the failure alarms) and the diagnostic system (the functional and technical condition parameters deviation). The changes of the functioning condition potential are used to determine the symptoms of momentary failures and the changes in the potential of the technical condition to determine the symptoms of parametric failures (non-total). The assumed reliability characteristics model has the form R(t) = f(_, Rb(t), Rc(t)), (where: Rb(t) and Rc(t) – the estimators of reliability for parametric and momentary failures, symbol ‘_’ denotes catastrophic failures not covered). For the identification of R (t) as an analytical function, the estimators are computed with the field data. The Weibull distribution function due to its flexibility is often used. Such is the case in this paper. Two parameters a and b known as the scale and the shape parameters are estimated with the computerized procedure realizing least-square method. The presented examples show good fit quality even for small set of data.
Źródło:
Journal of KONES; 2016, 23, 2; 239-246
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Variability Analysis of Current Operation Costs Versus Dependability of a Technical Object
Autorzy:
Dziaduch, Izabela
Powiązania:
https://bibliotekanauki.pl/articles/503932.pdf
Data publikacji:
2013
Wydawca:
Międzynarodowa Wyższa Szkoła Logistyki i Transportu
Tematy:
Life Cycle Cost (LCC)
operation costs
dependability
Opis:
In the article, the problem of economic dependability assessment of a repairable technical object is described. The definition of life cycle cost as well as the relationship between dependability and LCC are explained. Subsequently, on the basis of LCC method, the supply costs (connected with fuel usage) are estimated. Moreover, it is examined if technical object dependability has the influence on these costs.
Źródło:
Logistics and Transport; 2013, 17, 1; 63-70
1734-2015
Pojawia się w:
Logistics and Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Premises for a practical computer-aided parametric method of evaluation of the technical object reliability
Autorzy:
Borowczyk, H.
Lindsted, P.
Manerowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/242420.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
transport
reliability
diagnostics
computer-aided method
system operation
Opis:
This work presents a practical and effective method to evaluate the reliability status of an object basing on the observation ofchanges in its functioning (automatics) and its technical condition (diagnostics). It has been observed that changes of the functioning condition potential could serve to determine the symptoms of transient (momentary) damages and the changes in the potential of the technical condition to determine the symptoms of parametric damages (non-total). Such an information, as it turns out, is sufficient to calculate reliability characteristics before dangerous catastrophic damages occur and to calculate reliability characteristics for every single object without having to deal with a numerous set of objects. The presented computer-aided method can be of a substantial practical importance in coordination of adjusting/control functions, diagnostics and reliability actions and thanhs to that it can improve the level of organisation of a system operati
Źródło:
Journal of KONES; 2009, 16, 2; 29-37
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Classification of elements in the diagnostic model of a technical object for building an expert knowledge base
Autorzy:
Duer, S.
Pokoradi, L.
Bernatowicz, D.
Duer, R.
Powiązania:
https://bibliotekanauki.pl/articles/95315.pdf
Data publikacji:
2017
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
expert system
diagnostic system
expert knowledge base
technical diagnostic
algorithm
artificial intelligence
systemy ekspertowy
system diagnostyczny
ekspertowa baza wiedzy
diagnostyka techniczna
algorytm
sztuczna inteligencja
Opis:
The following paper presents the problem of classification (identification) elements in the internal structure of a technical object. This problem is directly linked with diagnostics and compilation of an expert data base. The basis of a process of grouping elements into classes is to make a diagnostic model of a given object in a form of a structure or set of basic elements of an object. In order to conduct the grouping of elements into subsets of s-th classes, the following paper compiles and presents analytical formulas and classification rules. Theoretical considerations presented in this paper are also verified using an engine control system as an example of a complex technical object.
Źródło:
Journal of Mechanical and Energy Engineering; 2017, 1, 1; 71-78
2544-0780
2544-1671
Pojawia się w:
Journal of Mechanical and Energy Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagnosing of a complex technical object in four-valued logic
Diagnozowanie złożonego obiektu technicznego w logice 4-wartościowej
Autorzy:
Duer, S.
Bernatowicz, D.
Wrzesień, P.
Duer, R.
Powiązania:
https://bibliotekanauki.pl/articles/209260.pdf
Data publikacji:
2018
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
technical diagnostics
diagnostic inference
multiple-valued logic
artificial intelligence
diagnostyka techniczna
wnioskowanie diagnostyczne
logiki wielowartościowe
sztuczna inteligencja
Opis:
This paper presents the essence of an investigation of a complex technical object with the use of four-valued logic. To this end, an intelligent diagnostic system (DIAG 2) is described. A special feature of this system was its capability of inferring k at {k = 4, 3, 2}, in which case the logic {k = 4} is applied. An important part of this work was to present the theoretical foundations describing the essence of inference in the four-valued logic contemplated. It was also pointed out that the basis for classification of states in the multiple-valued logic of the diagnostic system (DIAG 2) was the permissible interval of changes in the values of diagnostic signal features. Four-valued logic testing was applied to a system of wind turbine equipment.
W artykule zaprezentowano istotę badania stanu złożonego obiektu technicznego w logice 4-wartościowej. W tym celu zaprezentowano inteligentny system diagnostyczny (DIAG 2). Cechą szczególną tego systemu jest możliwość wnioskowania w k-tej logice przy {k = 4, 3, 2}, w tym przypadku zastosowano logikę {k = 4}. Ważną częścią tego opracowania jest przedstawienie w nim podstaw teoretycznych opisujących istotę wnioskowania w badanych logikach 4-wartościowych. Wskazano także, że podstawą klasyfikowania stanów w logikach wielowartościowych w systemie diagnostycznym (DIAG 2) jest zinterpretowany dopuszczalny przedział zmian wartości cech sygnałów diagnostycznych. Badaniu stanu w logice 4-wartościowej poddano system urządzeń elektrowni wiatrowej.
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2018, 67, 1; 33-42
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Method for assessment of risks connected with technical object functioning on the basis of Markov model of operation process
Autorzy:
Woropay, M.
Migawa, K.
Bojar, P.
Szubartowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/247063.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
transport system
operation process
Markov model
risk
Opis:
In the article, a method for assessment of risks connected with a technical object functioning has been studied, in a selected operating system. An urban system of bus transportation, in a selected urban complex, has been chosen as the research object. Functioning of each technical object operating system, including transportation systems, is dependent on its possibility to perform properly the assigned transport task. One of the methods for assessment of the transportation system ability to accomplish the assigned transport task in a proper way is determination of the transport means operation risk. The presented approach involves determination of indexes defining the risks connected with functioning of one technical object (transport means) in an executive subsystem. Indexes of the risk connected with functioning of a single technical object have been determined on the basis of a mathematical model of the operation process, in the studied transportation system. On the basis of the identification of the authentic transport system and the means of transport operation process carried out in it, crucial operational states were designed as well as the possibilities of transferring between the particular states. Based on that, an event-centered model of the use of the means of transport was built, followed by a mathematical model of that process. A Mathematical model of the operation process has been developed with acceptance of an assumption that the process model is to be represented by a homogeneous Markov model X(t). In this paper, the transport means operation risk is determined as a product of probability (or sum of probabilities) of its being in an undesirable state (states) of the Markov model of transport means operation process and the size of the damage in effect of being in the state (states). The size of the suffered damage is measured by a product of time and unit cost whose quantities are connected with being in the operation process undesirable state or states. Assessment of risk connected with technical objects operation and maintenance can be the point of reference to formulate design requirements concerning durability and reliability of the operated objects (transport means) as well as assumptions concerning design or modernization of the technical means necessary for assurance of the vehicle availability in a given transport system.
Źródło:
Journal of KONES; 2011, 18, 4; 563-569
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of text models in the formation of heuristics to solve tasks of diagnosing technical objects
Autorzy:
Korostil, J.
Korostil, O.
Powiązania:
https://bibliotekanauki.pl/articles/134938.pdf
Data publikacji:
2016
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
heuristics
diagnostics
monitoring
malfunction
complex technical object
Opis:
This paper describes research related to the use of heuristics in diagnostic tasks of complex technical objects. To build heuristics, the use of text models for technical objects is proposed. Therefore, this paper examines output methods of heuristics from text models and their transformation into logical formulae suitable for use in diagnostic algorithms. Analysis has been carried out for tasks solved during diagnostics, and methods of using heuristics in certain tasks have been reviewed. It is proposed to use heuristics for decision making while implementing certain algorithm steps of monitoring tasks for diagnostic parameters that are solved during diagnostics.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2016, 47 (119); 22-28
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Problems of control of mini unmanned aerial vehicle (MINIUAV)
Autorzy:
Hajduk, J.
Homziuk, A.
Kuliński, M.
Sabak, R.
Powiązania:
https://bibliotekanauki.pl/articles/242360.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
UAV
technical object
engineering
miniature avionics system
Opis:
It was introduced suggestions and results concerning some of control miniUAV problems in this article. They were formulated on base of theoretical and experimental investigations. Now the own construction miniature system avionics is being investigated. This system is designed to stabilisation of miniUAV and to control of navigation with GPS signal. Now system is used also as flight control recorder. The avionics control system which lets for very good and saved navigation miniUAV should be created. more over this system should use GPS signal and miniature sensors. Especially, a block Junction diagram of a miniature avionics unit - miniBSP MSOP. = 3 accelerometers, 3 rate gyroscopes, static pressure sensor, dynamic pressure sensor, control path in the autopilot channel of pitch and roll during the Start and Steady Flight stage, Control path in the draught control channel during Start and Steady Flight stage, general scheme of a ground-based flight control to pilot miniBSP unmanned aircrafts, visualization of the ground-based flight control station operation, airframe for testing during flight, positions of equipment items in the miniBSP airframe are presented in the paper.
Źródło:
Journal of KONES; 2009, 16, 2; 167-173
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Initial model of transport means availability of real city transport system
Autorzy:
Woropay, M.
Migawa, K.
Bojar, P.
Powiązania:
https://bibliotekanauki.pl/articles/242151.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
city transport system
Markov's model
technical object
Opis:
The article presents a determination method of transport means service ability in a real city transport system. The considerations have been demonstrated on the basis of a real city bus transport system in a chosen agglomeration. The executive subsystem consisting of elementary subsystems of the type human - technical object (operator - transport means) whose service ability and reliability have a direct influence on capability to perform the transport task is directly responsible for accomplishment of the city transport system tasks. In order to develop a model of means of transport serviceability there were determined significant states of the operational use process and there was made a division and reduction of the number of states in terms of the availability criterion. On this basis, an event model of the process of transport means operational use, and then a mathematical model of this process, were built with the assumption that its model is a homogenous Markov 's process X(t). Next, boundary values of availability coefficient for the distinguished availability levels of transport means used in the city transport system were determined for operational data obtained from a real city bus transport system. The discussed model for determination of transport means availability is an initial one, developed on the basis of a nine-state model of operational use. In further part of the paper, there will be developed a resultant model of transport means availability determination (semi-Markov 's sixteen-state model), being a component of a wider, decision model for creation and assessment of transport means availability.
Źródło:
Journal of KONES; 2009, 16, 2; 495-502
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 41

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