Design and Safety Assessment of Critical Systems

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One reason among others is the lack of an applicable integration method in an existing development process. In this paper, we propose a process to integrate formal model-based verification techniques into the development life-cycle of a safety critical system. The core idea is to systematically refine informal specifications by 1 categorization, 2 structural refinement, 3 expected behavioral refinement, and finally, 4 operational semantics.

To support modeling, traceability is upheld through all refinement steps and a number of consistency checks are introduced. The proposed process has been jointly developed with the German Railroad Authority EBA and an accredited safety assessor. We implemented an Eclipse-based IDE with connections to requirement and systems engineering tools as well as various verification engines.

5th International Symposium, IMBSA 2017, Trento, Italy, September 11–13, 2017, Proceedings

Safety analyses are of paramount importance for the development of embedded systems. In order to perform these analyses, safety engineers use different modeling techniques, such as, for instance, Fault Trees or Reliability Block Diagrams.

About this book

One of the industrial development process challenges today is to ensure the consistency between safety models and system architectures. Model Based Safety Analysis MBSA is one of the newest modeling methods, which promises to ease the exchange of information between safety engineers and system designers. The aim of this article is to discuss an approach to manage the consistency between MBSA models and system architectures. Our study is based on the experimentation of the co-design of an RPAS Remotely Piloted Aircraft System involving system design and safety teams during the early conception phases of an industrial development process.

We simulate the process of exchange between the system design and the safety assessment with the constraint of creating safety models close to system architecture. We identify significant exchange points between these two activities. We also discuss the encountered problems and perspectives on the possibility to ensure the consistency between safety and system models.

Classical organization in disciplinary silos in the industry reaches its limits to manage complexity: problems are discovered too late and the lack of communication between experts prevents the early emergence of solutions. This is why it is urgent to provide new collaborative methods and ways to integrate various engineering fields, early in and all along the development cycle.

In this context, we are particularly interested in the possible exchanges between two engineering fields: system architecture design and safety analysis.

The questions are: how can one ensure that the parties involved are speaking about the same system? And which concepts can synchronize several engineering fields? First we present a use case: a system embedded in a helicopter. Second we present the concepts that we define to implement synchronization of models. Finally we give our feedbacks, limits and related works. We propose the concept of a model-connected safety case that could simplify certification of complex systems.

System design models support the synthesis of both the structure of the safety case and the evidence that supports this structure. The resultant safety case argues that all hazards are adequately addressed through meeting the system safety requirements. This overarching claim is demonstrated via satisfaction of the integrity requirements that are assigned to subsystems and components of the system through a sound process of model-based allocation that respects the system design and follows industry standards.

The safety evidence that substantiates claims is supported by evidence which is also auto-constructed from the system model. As the system model evolves during design, the corresponding model-connected safety case can be auto-updated. The approach is underpinned by a data model that connects safety argumentation and safety analysis artefacts, and is facilitated by a software tool. These languages were defined with different concerns and this paper aims at presenting their principles and how they can be related.

The resulting AltaRica model has been analyzed with the AltaRica safety tools and the experimental results are discussed. Production Trees PT allow modeling the relationship between the units of a production system with a particular attention to the production levels of the units located upstream and downstream a production line. For that new modeling operators have been introduced allowing to gather or to split the flows upstream or downstream a PT.

Our results include the reliability level of the power system configuration in terms of load interruption, load loss probability and related frequency indices, and the importance factor of components to identify the critical parts of the system. The standard approach is to carefully code, inspect, document, test, verify and analyze the system. Another approach is to certify a production system, a compiler , and then generate the system's code from specifications.

Another approach uses formal methods to generate proofs that the code meets requirements. The technology requirements can go beyond avoidance of failure, and can even facilitate medical intensive care which deals with healing patients , and also life support which is for stabilizing patients. From Wikipedia, the free encyclopedia.

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Modeling and Assessment of Safety Critical Systems

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Resiltech is an ICT Information and Communications Technology consultancy company operating in the field of critical systems; main business are related to:. Analysis, design, verification and validation of informatic systems, focusing on embedded systems for safety-critical and security applications for railway, automotive, medical and space domains. Research and development in ICT and automation, with focus on dependable systems, specially critical system ones.

We are excited about this important and stimulant partnership, further described on Arm website. The workshop agenda is available here.

Metrics design for safety assessment

Resiltech jointly with Aalborg University is organizing the 1st International Workshop on "Dependable Solution for Intelligent Electricity Distribution Grid DSOGRI ", which will provide a forum for researchers and engineers in academia and industry for discussing and analyzing current solutions, approaches, research results, experiences and products in the field of intelligent electricity grids to investigate issues related to the ICT-based management of failures, including cyber-security aspects. More info at www. Wave Computing has announced that its MIPS processor technology is today enabling over 80 percent of vehicles equipped with Advanced Driver Assistance Systems from the leading automotive manufacturers.