Article | REF: BM8070 V2

Securement of mechatronic .Context and hardware architecture

Author: Jean-Louis BOULANGER

Publication date: December 10, 2021

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ABSTRACT

The aim of this article is to introduce the safety principles that can be implemented within the framework of mechatronic systems, in order to reduce the risk of default. À mechatronic system is composed of elements of various natures: mechanical, electronic and software components. Two particular aspects are dealt with: "hardware architecture" (electronic component) and "software application" (software components). Safety of a hardware architecture was the subject of numerous studies, which helped to define various mechanisms such as fault detection, diversity, temporal redundancy, hardware redundancy, data redundancy and recovery.

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AUTHOR

  • Jean-Louis BOULANGER: Doctorate in Computer Science - Evaluator – Certifier - SILAS-SAS, Champigny, France

 INTRODUCTION

Mechatronic systems are becoming more and more complex, leading to more and more frequent failures, which need to be countered to limit the risk by a set of techniques grouped together under the term system safety. The focus is on two components of mechatronic systems:

  • hardware architecture" aspects (electronic component) ;

  • software application" aspects (IT component).

The risk associated with the mechanical component is not dealt with here, and the reader is referred to the dossier on integrating safety into machine design [BM 5 007] .

This first article [BM 8 070] focuses on techniques for securing electronic hardware architecture, with a reminder of the basic principles of dependability and a definition of the obstacles that can affect the proper functioning of a system. The standard IEC 61508 characterizes the requirements for demonstrating the safety of an E/E/EP (electrical/electronic/programmable electronic) system. This standard has been adapted for use in various fields (railways, automotive, etc.). Techniques for ensuring the safety of these electronic architectures, such as fault detection, diversity, time redundancy, hardware redundancy, data redundancy and recovery, are illustrated by examples, all of which are representations of real applications in different fields (aeronautics, railways, automotive, space, nuclear...). A second article [BM 8 071] covers techniques for securing software applications.

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KEYWORDS

Standard   |   safety   |   Dependabilty   |   FGPA   |   RAMS


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