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Wyświetlanie 1-15 z 52
Tytuł:
Analysis of Failure States of Functional Systems of Aircraft Such as Boeing 737 in the Airline
Autorzy:
Terescenko, Jevgenijs
Shestakov, Vladimir
Vaivads, Andris
Powiązania:
https://bibliotekanauki.pl/articles/36834017.pdf
Data publikacji:
2023
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
aircraft equipment
aviation technology
probability of failure
components
functional systems
Opis:
The article presents the results of analysis of failures of the main functional systems units of aircraft Boeing 737 during the last 10 years of its operation in the national airline of Latvia ‘Air Baltic Corporation’. Total flight time was TΣ = 322,529 h and 184,538 cycles [1]. These data were obtained from daily reports of defects and unplanned consumption of spare parts for these systems. Failures of instrumental equipment of avionic systems were investigated in detail. Based on calculations of their failure probability and component replacement frequency, a comprehensive system including measures and their technical and instrumental support has been developed to improve maintenance productivity. Such a system requires relatively inexpensive components, is simple and can be used in the operation of this type of aircraft.
Źródło:
Transactions on Aerospace Research; 2023, 4 (273); 71-78
0509-6669
2545-2835
Pojawia się w:
Transactions on Aerospace Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of undesirable events in operation of bulk carriers
Autorzy:
Monieta, J.
Powiązania:
https://bibliotekanauki.pl/articles/245847.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
bulk carriers
functional systems
elements
adverse events
piston marine diesel engines
Opis:
This paper describes the introduced results of researches of undesirable events at one shipowner for a period of twelve years. The study included mostly merchant vessels bulk carriers and their significant objects. The ships were decomposed on functional systems and elements also divided them into of the navigation and machinery part. There was carried out a quantitative and economics analysis. In the economic analysis have been exchange rates accounted. Attempted classification of the causes of the event and its participation in material losses incurred. These events are also a threat to human life and health as well as the natural environment. One showed on methods and means of diagnostics as manner of limitation their sizes and results. The results should be useful in the design of diagnostic experiments to select the objects that should be subject monitored. The larges losses of adverse events were initiated in the functional systems: navigation, main drive and cargo. The most often adverse events are collisions. The most expensive vessel objects in the engine room proved to be reciprocating internal combustion engines for main propulsion and auxiliary. The investigations were conducted for all types of reciprocating internal combustion engines mounted on the test vessels. Combustion engines were operated under different external and internal conditions and were feed distillate and residual fuel oils.
Źródło:
Journal of KONES; 2013, 20, 2; 291-297
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Further results on the equivalence to Smith form of multivariate polynomial matrices
Autorzy:
Boudellioua, M. S.
Powiązania:
https://bibliotekanauki.pl/articles/205802.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
linear functional systems
multivariate polynomial matrices
unimodular equivalence
smith form
Gröbner bases
Opis:
Multivariate polynomial matrices arise from the treatment of linear systems of partial differential equations, delay-differential equations or multidimensional discrete equations. In this paper we generalize some of the results obtained for the equivalence to the Smith normal form for a class of multivariate polynomial matrices.
Źródło:
Control and Cybernetics; 2013, 42, 2; 543-551
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ship fires caused by primary failure of the fuel filter of the engine driving the generator
Autorzy:
Monieta, J.
Powiązania:
https://bibliotekanauki.pl/articles/135396.pdf
Data publikacji:
2016
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
merchant vessels
functional systems
adverse events
reciprocating internal combustion engines
investigations
accidents
Opis:
This article presents selected results of investigations on adverse events of ships throughout one year. The investigations included mainly merchant vessels used to transport bulk material and heavy objects. Ships have been divided into functional systems and elements and into navigational and machine parts. An attempt was made to classify the causes of accidents and evaluate material losses. The quantitative analysis of the causes of the events leads to different conclusions than those reached on the basis of the analyses of losses. Although the failures on-board the vessel occurred more frequently, the costs of machine adverse events were larger. The most critical consequences was fire of a ship caused by loosening of the bleed screw of the fuel filter. Auxiliary engines of the vessel were operated in different external and internal conditions, and were fed by distillation fuel. As a consequence, the evacuation of the crew and fire suppression were required, using the CO2 installation of the ship. The ship was stopped and deprived of its primary sources of electric energy. An analysis of the event was along with the elaboration of a plan of preventive measures. The results should be useful for selecting the monitored diagnostic objects of vessels.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2016, 47 (119); 36-41
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Minimalny rząd obserwatorów funkcjonalnych liniowych układów ciągłych
Minimal rank of functional observers for linear continuous-time systems
Autorzy:
Kaczorek, T.
Powiązania:
https://bibliotekanauki.pl/articles/151851.pdf
Data publikacji:
2002
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
obserwatory funkcjonalne układów
liniowe układy ciągłe
functional observers for systems
linear continuous-time systems
Opis:
Podano nową metodę wyznaczania (projektowania) obserwatorów funkcjonalnych minimalnego rzędu liniowych układów ciągłych. Sformułowano warunki konieczne i wystarczające istnienia statycznego sprzężenia od wyjścia układu, które dokładnie odtwarza zadaną funkcję liniowego wektora stanu. Podano również procedury doboru macierzy obserwatora funkcjonalnego oraz statycznego sprzężania od wyjścia. Procedury te zostały zilustrowane przykładami numerycznymi.
A new method for designing of the functional observers for linear continuous-time systems is proposed. Necessary and sufficient conditions are established for the existenceof a static output-feedback that reconstruct exactly a given linear function of state vector. Procedures for computation of matrices of the functional observer and the static output-feedback are derived and illustrated by numerical examples.
Źródło:
Pomiary Automatyka Kontrola; 2002, R. 48, nr 9, 9; 5-8
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Difference methods for infinite systems of hyperbolic functional differential equations on the Haar pyramid
Autorzy:
Jaruszewska-Walczak, D.
Powiązania:
https://bibliotekanauki.pl/articles/2050179.pdf
Data publikacji:
2004
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
initial problems
infinite systems of differential functional equations
difference functional inequalities
nonlinear estimates of Perron type
Opis:
We consider the Cauchy problem for infinite system of differential functional equations $\partial_{t}z_{k}(t, x) = f_{k}(t, x, z, \partial_{x}z_{k}(t, x)), k \in \mathbf{N}$. In the paper we consider a general class of difference methods for this problem. We prove the convergence of methods under the assumptions that given functions satisfy the nonlinear estimates of the Perron type with respect to functional variables. The proof is based on functional difference inequalities. We constructed the Euler method as an example of difference method.
Źródło:
Opuscula Mathematica; 2004, 24, 1; 85-96
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Procesy biznesowe we współczesnym przedsiębiorstwie realizowane za pomocą systemów informatycznych
Business processes in present-day companies performed by IT systems
Autorzy:
Wrona, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/1215128.pdf
Data publikacji:
2020
Wydawca:
Wyższa Szkoła Zarządzania i Bankowości w Krakowie
Tematy:
systemy informatyczne
klasy funkcjonalne systemów
proces biznesowy
mapowanie procesów biznesowych
IT systems
functional classes of systems
business process
business processes mapping
Opis:
Występująca na rynku konkurencja, determinuje przedsiębiorstwa do usprawniania działania organizacji. W tym celu, każde przedsiębiorstwo wykorzystuje różnego rodzaju informatyczne systemy zarzadzania, aby w bardziej sprawny i konkurencyjny sposób działać na rynku. Wdrażane w przedsiębiorstwach systemy informatyczne mają za zadanie realizację występujących w organizacji procesów biznesowych. Procesy biznesowe są siecią powiązanych ze sobą czynności, procedur, zadań, które realizowane są sekwencyjnie lub równolegle, przekształcając zasoby wejściowe w wyjścia, będące oczekiwaniem klientów. W niniejszym opracowaniu zaprezentowano procesy biznesowe występujące we współczesnym Przedsiębiorstwie i realizowane za pomocą zintegrowanych systemów informatycznych. Zawarto również ocenę wykorzystania systemów informatycznych w procesach biznesowych.
Competition on the market forces companies to improve their effectiveness. Thus, every company uses various IT management systems to operate in a more efficient and competitive way. The purpose of IT systems that are implemented in companies is to accomplish their business processes. Business processes are a network of interrelated activities, procedures and tasks that are performed either sequentially or parallelly to transform inputs into outputs that are expected by customers. The article presents business processes in a present-day company that are accomplished with the use of integrated IT systems. The article also includes an assessment of the use of IT systems in business processes.
Źródło:
Zeszyt Naukowy Wyższej Szkoły Zarządzania i Bankowości w Krakowie; 2020, 56; 40-49
2300-6285
Pojawia się w:
Zeszyt Naukowy Wyższej Szkoły Zarządzania i Bankowości w Krakowie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Verification mechanism for lightweight componenent-based environment based on ioc container
Autorzy:
Leszko, R.
Piętak, K.
Powiązania:
https://bibliotekanauki.pl/articles/305795.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
verification
component-based systems
functional integrit
Opis:
This paper presents a concept of component verification framework dedicated to a particular lightweight component environment. The starting point of the paper constitutes a discussion about the significance of verification of syntax in- consistencies in software development. Next, the need of verification in service-oriented and component-based systems is presented, and various approaches of verification in existing component environments are explained. The main part of the paper introduces a concept of functional integrity of component-based systems that utilize verification mechanisms which check consistency between components. The proposed solution is built on a fine-grained component environment (close to classes similarly to the Spring Framework) realized in the AgE platform. Selected technical aspects of framework design illustrate the considerations of the paper.
Źródło:
Computer Science; 2013, 14 (4); 577-588
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Existence of solutions and monotone iterative method for infinite systems of parabolic differential-functional equations
Autorzy:
Brzychczy, Stanisław
Powiązania:
https://bibliotekanauki.pl/articles/1293995.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
method of lower and upper functions
infinite systems of parabolic differential-functional equations
monotone iterative method
Opis:
We consider the Fourier first boundary value problem for an infinite system of weakly coupled nonlinear differential-functional equations. To prove the existence and uniqueness of solution, we apply a monotone iterative method using J. Szarski's results on differential-functional inequalities and a comparison theorem for infinite systems.
Źródło:
Annales Polonici Mathematici; 1999, 72, 1; 15-24
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fuzzy Techniques in the Functional Approximation of Volumetric Capnograms
Autorzy:
Scandurra, A. G.
Pra, Ana L. Dai
Passoni, L. I.
Meschino, G. J.
Clara, F. M.
Tusman, G.
Böhm, S. H.
Powiązania:
https://bibliotekanauki.pl/articles/108656.pdf
Data publikacji:
2011
Wydawca:
Społeczna Akademia Nauk w Łodzi
Tematy:
volumetric capnography
Takagi-Sugeno Fuzzy Inference Systems
functional modeling
Opis:
The Volumetric Capnography (VC) is the plot of amounts of expired CO₂ within one tidal breath. The estimation of physiologic parameters derived from the VC is useful in the study of respiratory physiology, clinical anesthesia and critical care medicine. In this work we propose the use of a function based on a Takagi-Sugeno fuzzy model and a functional approximation based on the Levenberg-Marquardt algorithm to approximate the VC, with the goal to compute two variables of interest: the airway dead space (VDaw) and the slope of the so-called Phase III (SIII). These models presented a good performance in those capnograms that showed difficulties to be modeled with traditional medical analysis.
Źródło:
Journal of Applied Computer Science Methods; 2011, 3 No. 1; 17-29
1689-9636
Pojawia się w:
Journal of Applied Computer Science Methods
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strong maximum principles for infinite systems of parabolic differential-functional inequalities with initial constant estimates
Autorzy:
Brandys, Jolanta
Powiązania:
https://bibliotekanauki.pl/articles/745310.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
infinite systems
parabolic differential-functional inequalities
strong maximum principle
Opis:
The purpose of this paper is to present strong maximum principles for infinite systems of parabolic differential-functional inequalities with initial inequalities in relatively arbitrary \((n+1)\)-dimensional time-space sets more general than the cylindrical domain.
Źródło:
Commentationes Mathematicae; 2007, 47, 2
0373-8299
Pojawia się w:
Commentationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methodological issues of functional safety and reliability assessment of critical systems in industrial hazardous plants
Autorzy:
Kosmowski, K. T.
Powiązania:
https://bibliotekanauki.pl/articles/2069067.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
hazardous plants
control systems
functional safety
security
human factors
human reliability
Opis:
The aim of this article is to identify and discuss some methodological issues that are of interest among functional safety specialists and experts after publication of the second edition of international standards IEC 61508 and IEC 61511, including the design and implementing the safety-related functions of higher safety integrity levels and protection layers. The basic role of safety-related systems is to reduce effectively and to control in time the individual and/or societal risk with regard to its tolerable levels. These issues include: risk criteria, reliability data, probabilistic models of systems operating in high and/or low mode, dependent failures, human reliability analysis, security of programmable safety-related systems, and reducing uncertainty issues in decision making process applying the cost-benefit analysis. Selected aspects of these issues are discussed and some challenges requiring further research are indicated.
Źródło:
Journal of Polish Safety and Reliability Association; 2015, 6, 2; 59--70
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantitative Lp stability analysis of a class of linear time-varying feedback systems
Autorzy:
Gurfil, P.
Powiązania:
https://bibliotekanauki.pl/articles/908206.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
automatyka
robotyka
Lp stability
time-varying Lur'e systems
functional analysis
Opis:
The Lp stability of linear feedback systems with a single time-varying sector-bounded element is considered. A sufficient condition for Lp stability, with 1LpL Y, is obtained by utilizing the well-known small gain theorem. Based on the stability measure provided by this theorem, quantitative results that describe output-to-input relations are obtained. It is proved that if the linear time-invariant part of the system belongs to the class of proper positive real transfer functions with a single pole at the origin, the upper bound on the output-to-input ratio is constant. Thus, an explicit closed-form calculation of this bound for some simple particular case provides a powerful generalization for the more complex cases. The importance of the results is illustrated by an example taken from missile guidance theory.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2003, 13, 2; 179-184
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Procedure based functional safety and information security management of industrial automation and control systems on example of the oil port installations
Autorzy:
Śliwiński, M.
Piesik, E.
Powiązania:
https://bibliotekanauki.pl/articles/2068879.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
functional safety
security
cyber HAZOP
industrial control systems
oil port installations
Opis:
The approach addresses selected technical and organization aspects of risk mitigation in the oil port installations with regard to functional safety and security requirements specified in standards IEC 61508, IEC 61511 and IEC 62443. The procedure for functional safety management includes the hazard identification, risk analysis and assessment, specification of overall safety requirements and definition of safety functions. Based on the risk evaluation results the safety integrity level (SIL) and security assurance level (SAL) will be determined for consecutive safety functions. The proposed approach will be composed of the following items: process and procedure based safety and security management, example of procedure based safety management including insurance, integrated safety and security assessment of industrial control system (ICS) of the oil port pipelines, tanks and critical infrastructure.
Źródło:
Journal of Polish Safety and Reliability Association; 2017, 8, 1; 129--138
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cognitive engineering and functional safety technology for reducing risks in hazardous plants
Autorzy:
Kosmowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/2068937.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
cognitive science
cognitive systems engineering
human factors
human reliability
functional safety
Opis:
Cognitive engineering is considered nowadays as interesting multidisciplinary domain that focuses on improving the relations between humans and the systems that are supervised and operated. The industrial automation and control systems (IACS) in hazardous plants are increasingly computerized and perform various safety functions. These are designed and implemented according to the functional safety concept. The objective is to maintain high performance / productivity and reduce various risks related to identified hazards and threats. An approach is proposed to apply selected cognitive engineering methods for verifying the design of the functional safety technology implemented in given hazardous plant in context of defined safety functions, operator interfaces, communication means and procedures. The methodology developed might be applied for functional safety management in life cycle of industrial hazardous plants and oil port terminals.
Źródło:
Journal of Polish Safety and Reliability Association; 2017, 8, 1; 73--86
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 52

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