05 Fakultät Informatik, Elektrotechnik und Informationstechnik
Permanent URI for this collectionhttps://elib.uni-stuttgart.de/handle/11682/6
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Item Open Access Computer-aided safety analysis of computer-controlled systems : a case example(2000) Biegert, UweComputer controlled systems consist of a complex interaction between technical process, human task and software. For the development of safety critical systems new method are required, which not only consider one of these parts of a computer-controlled system. In this paper a qualitative modeling method is presented. The method is called SQMA, Situationbased Qualitative Modeling and Analysis and it origin goes back to Qualitative Reasoning. First, all parts of a system are modeled separated and then combined to a unique model of a computer-controlled system. With this qualitative model a computer supported hazard analysis can be realised.Item Open Access Sichere Automatisierungssysteme mit Hilfe qualitativer Modellierung und quantitativer Risikobewertung(2000) Biegert, UweFür die Sicherheitsanalyse von Prozessautomatisierungssystemen ist es notwendig, alle Systembestandteile zu betrachten. Im Beitrag wird ein Modell vorgestellt, bei dem der technische Prozess, die Automatisierungssoftware und menschliche Bedieneingriffe qualitativ beschrieben werden. Aus den einzelnen Modellen und deren Wechselbeziehungen werden Situationen berechnet, die das mögliche Verhalten des Prozessautomatisierungssystems beschreiben. Im Beitrag wird gezeigt, wie eine Risikobewertung der berechneten Situationen nach VDI/VDE 3542 realisiert werden kann. Mit Hilfe der Quantifizierung des Risikos können konkrete Aussagen bezüglich des Grenzrisikos eines Prozessautomatisierungssystems gemacht werden.Item Open Access Using qualitative models for safety analysis of industrial automation systems(2000) Biegert, UweNowadays software enables to control more complex processes, but at the same time it is also responsible for the welfare of humans and environment. A failure in a software program can influence the technical process with unforeseeable consequences. Generally the safety of a computer-controlled system depends on a complex interaction between technical process, controller software and human task. Classic methods for safety analysis mostly are specialized to consider one part of the system and the analysis is a brainstorming procedure. In this paper a model-based approach for safety analysis is discussed. All parts of the computer controlled systems are first described with the help of a qualitative modeling. Then the different qualitative models are combined to a unique model of a computer-controlled system. Based on this model a computer supported safety analysis can be realized. The model enables the analysis of the interaction between the system parts even by considering any multiple failure.