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Wyniki wyszukiwania dla: safety integrity level
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Determining required safety integrity level
PublikacjaOne of the most important stage of technical system functional safety analysis is defining the safety-related functions as well as determining safety integrity level (SIL) for each defined function. A properly carried out hazard identyfication process is the necessary condition for correct definition of the safety-related functions. Determining the safety integrity level (SIL) is based on risk assessment taking into account risk...
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Determining and verifying the safety integrity level with security aspects
PublikacjaSafety and security aspects consist of two different group of functional requirements for the control and protection systems. It is the reason why the analyses of safety and security shouldnt be integrated directly. The paper proposes extension of the currently used methods of functional safety analyses. It can be done with inclusion of the level of information security assigned to the technical system. The article addresses some...
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Safety integrity level verification for safety-related functions with security aspects
PublikacjaThe article is devoted some important issues of the functional safety analysis, in particular the safetyintegrity level (SIL) verification of safety functions to be implemented within the distributed controland protection systems with regard to cyber security aspects. The procedure for functional safety man-agement includes hazard identification, risk analysis and assessment, specification of overall safetyrequirements and definition...
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Methods for verification safety integrity level in control and protection systems
PublikacjaW artukule przedstawiono podstawowe oraz zaawansowane ilościowe metody weryfikacji poziomów nienaruszalności bezpieczeństwa SIL w systemach sterowania i zabezpieczeń. Metody te zawierają analizę wrażliwości i niepewności modeli probabilistycznych tych systemów. Pod uwagę wzięte zostały także uszkodzenia o wspólnej przyczynie. Zaprezentowane zostały wyniki analiz oraz zalety ich stosowania.
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Determining and verifying the safety integrity level of the safety instrumented systems with the uncertainty and security aspects
PublikacjaSafety and security aspects consist of two different group of functional requirements for the control and protection systems. In the paper it is proposed that the security analysis results can be used as a factor increasing or decreasing the risk level. It concerns a process of determining required safety integrity level of given safety functions. The authors propose a new approach for functional safety risk analysis. In this case...
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Determining and verifying the safety integrity level of the controland protection systems under uncertainty
PublikacjaThe probabilistic models of the electrical, electronic and programmable electronic (E/E/PE)systems, which are proposed in the IEC 61508 and IEC 61511 standards, do not cover the uncertainty aspectsof results obtained from these models. The proposed method takes into consideration the sensitivity analysisof probabilistic models of E/E/PE systems as well as the uncertainty of probabilistic results. It uses differentialfactors, which...
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Security aspects in verification of the safety integrity level of distributed control and protection systems
PublikacjaPrzedstawiono najważniejsze zagadnienia zwišzane z weryfikacjš poziomu nienaruszalnoci bezpieczeństwa SIL rozproszonych systemów sterowania i zabezpieczeń z uwzględnieniem aspektów ochrony informacji. Przedstawiono ilociowš metodę weryfikacji poziomu SIL z wykorzystaniem wskaników różnicowych oraz dwuparametrowš funkcję kryterialnš łaczšcš wymagania SIL oraz EAL (poziom uzasadnionego zaufania dla ochrony informacji).
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Integrity level verification for safety-related functions
PublikacjaThis article describes methods for safety integrity level (SIL) verification of safety-related functions with regard to probabilistic criteria given international standards IEC 61508 and IEC 61511. These functions are to be realized using the electrical, electronic and programmable electronic (E/E/PE) systems or safety instrumented systems (SIS). Some methods are proposed for quantitative probabilistic modelling taking into account...
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The operation mode of E/E/PE system and its influence on determining and verifying the safety integrity level = Rodzaj pracy systemu E/E/PE i jego wpływ na określanie i weryfikację poziomu nienaruszalności bezpieczeństwa
PublikacjaNorma PN-EN 61508 wprowadza kryteria probabilistyczne dla wyróżnionych rodzajów pracy systemów E/E/PE, które związane są z poziomami nienaruszalności bezpieczeństwa SIL. Dla systemów sterowania i zabezpieczeń, pracujących w trybie rzadkiego przywołania do działania, kryterium tym jest przeciętne prawdopodobieństwo niewypełnienia funkcji bezpieczeństwa na żądanie PFDavg. W przypadku systemów realizujących funkcje bezpieczeństwa...
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Safety Integrity Verification Issues of the Control Systems for Industrial Process Plants
PublikacjaThe aim of this article is to identify and discuss some issues that can be encountered in designing the industrial automation and control systems (IACS) for implementing safety functions. In a functional safety standard IEC 61511 for the process industry such systems are named the basic process control systems (BPCS) and the safety instrumented systems (SIS). In a generic functional safety standard IEC 61508 they are depicted as...
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Road safety management at the strategic level
PublikacjaZarządzanie ryzykiem jest obecnie jednym z podstawowych narzędzi zarządzania bezpieczeństwem w technice, ekonomii, służbie zdrowia itp. W wielu dziedzinach istnieją unormowane procedury prowadzenia analizy, oceny i redukowania ryzyka. W zarządzaniu bezpieczeństwem ruchu drogowego nie ma powszechnych uregulowań stosowania tej metody zarządzania bezpieczeństwem. Dotychczas dwa zagadnienia zarządzania brd zostały docenione i stały...
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Safety at railway level crossings and Vision Zero
PublikacjaIn this work, safety analysis at the railway level crossings is presented using advanced mathematical modelling. Resistivity of track subgrade panels is taken into account. The analysis does not refer to the assessment of the current regulations. Specific cases of generalized dynamic system are considered by introducing operations S=Δ, S=P defined in space C(N) of real sequences. In this model, generalized discrete exponential...
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ROAD SAFETY MANAGEMENT TOOLS FOR COUNTRY STRATEGIC LEVEL
PublikacjaStrategic road safety programmes setting out long-term visions and road infrastructure development plans must be based on road safety forecasts and an understanding of the long-term impact of different measures on road safety. The objective of this paper is to discuss a concept of road safety management for an area of a selected country because there are no simple tools of road safety management for the development and implementation...
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Monitoring of safety belts use on national and regional level
PublikacjaW referacie przedstawiono charakterystykę krajowego i regionalnych systemów monitorowania stosowania pasów bezpieczeństwa w pojazdach. Bazę systemu krajowego stanowi 16 stacji pomiarowych o stałych lokalizacjach w stolicach województw, natomiast bazę systemów regionalnych stanowią stałe punkty pomiarowe rozmieszczone w stolicach powiatów oraz na wybranych drogach. Badania prowadzone są w kraju co 2 miesiące, w województwach co...
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Modelling selected road safety measures at the regional level in Europe
PublikacjaRegions are Europe’s basic levels of management. The literature was reviewed to identify regional safety analyses and some of the factors that are important for road safety in the regions. Next, data were collected atthe regional NUTS 2 level in Europe for the years 1999-2008. An analysis of the data helped identify f actors which have the strongest bearing on fatalities and other safety measures. This paper presents the initial...
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Fuzzy regresion approach to road safety analysis at regional level
PublikacjaRoad safety modelling on regional level of NUTS 2 in the EU is the complex issue and authors of this article indicate this in previous publications. NUTS 2 are basic regions for the application of regional policies (0.8-3 m inhabitants). During multivariate models development they discovered that it is difficult to make regression model well described all regions, even if they are from one country. In the first step Poisson model...
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MODEL OF MULTILEVEL STOCHASTIC ANALYSIS OF ROAD SAFETY ON REGIONAL LEVEL
PublikacjaIn this paper multilevel approach to the issue of road safety level on the road network of European regions, classified as NUTS 2 in statistical databases of the European Union, has been presented. Following the pattern of many publications on road safety it has been assumed that the risk calculated as the number of death casualties in road accidents per 100,000 inhabitants of a given region has Poisson distribution. Therefore,...
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The effect of road restraint systems on the level of road safety - Polish experience
PublikacjaRoadside accidents happen when a vehicle runs off the road. The majority of these accidents are very severe because leaving the road is usually followed by hitting a solid obstacle (tree, pole, support, culvert front wall, barrier). Roadsides are some of the most important issues of road safety. They have been studied for years to identify roadside hazards and the effectiveness of road safety measures such as restraint systems....
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Times Series Analysis Of Road Safety Trends At The Regional Level In Poland
PublikacjaThe paper presents possibility of applying a structural times series modeling with explanatory and intervention variables as a tool capable for explaining the changes in the monthly number of fatalities and seriously injured in traffic accidents. The analysis covers regional level and takes into consideration traffic accidents data of two regions: Pomorskie and Warmia-Mazury. In addition short-term forecasts for the two regions...
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Impact of Intelligent Transport Systems Services on the Level of Safety and Improvement of Traffic Conditions
PublikacjaThe positive effects of the services of Intelligent Transport Systems (ITS) on the level of transport systems operation was confirmed by long-term studies conducted, inter alia, in the USA, Japan and Europe. Benefits resulting from the application of ITS services can be presented through performance indicators. The indicators represent in a numerical or qualitative manner to what extent ITS services can contribute to improving...