By Oliver Schulz, Jan Peleska (auth.), Erwin Schoitsch (eds.)
Computers and microprocessors are essential in smooth technical platforms, their deployment spanning the domain names automobile, railway, aerospace, and transportation, safeguard, strength provide, telecommunication, severe infrastructures and procedure ind- attempts. They practice projects few a long time in the past have been very tough if no longer most unlikely. As they practice those initiatives with expanding potency, a growing number of projects are shifted from to software program, this means that the dependability of computers turns into the most important for the protection, safeguard and reliability of technical structures. With the so-called “embedded structures” (becoming progressively more clever, networked and co-operating with one another, with people and the surroundings) pcs have invaded all points of lifestyle. New paradigms have arisen, like ubiquitous computing, systems-of-systems, power and source wisdom, huge, immense complexity concerns and so on, requiring a extra holistic platforms view in addition. th So, after 31 years of SAFECOMP, the emphasis of the 29 occasion is on severe - bedded platforms, that are nearly omnipresent. Their impression on our lives, dangers and demanding situations are usually no longer good understood (underestimated or exaggerated). The p- mary factor is to deal with complexity, new failure modes and source administration, because of shrinking function dimension, multi-core structures and administration of a number of versions, whereas keeping dependability houses and robustness.
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Example text
38 C. Gómez, P. Liggesmeyer, and A. Sutor Ventilation System Down e1 e2 & >=1 e3 Filter down AC Motor Driven Fan Flow Switch Down (FD) Down (ACMDFD) (FSD) e1 e2 e3 Fig. 8. Semi-automatic derivation of CFT CFT elements. Figure 8 depicts the elements that we obtain through semi-automatic generation and how they can be connected according to the propositional logic formula defined in equation 1. Moreover, the MTBF of the VS can be calculated by using the MTBF values of the Filter, AC Motor Driven Fan and Flow Switch components.
We would not have derived the following recommendation from a mere components point of view: • A hand of a child sitting on the floor could be probably invisible for the sensors and the collision avoiding system, a child could be hurt => rounded bottom edges are recommended, a test is necessary. On the other hand, voltage-related hazards like in table 1 would not be found in an operational approach. High coverage was attained only by the two-fold analysis. Several further recommendations for the robot-design and play-scenarios were made during and after the HAZOP analysis: A Novel HAZOP Study Approach in the RAMS Analysis • • • • 27 Robot arms should be designed soft and without sharp edges All used material should be conformant to EN 71 Over-current and over-temperature detection should be implemented Make failure detection of collision avoiding system (sensors) fail-safe 6 Conclusions and Further Work In our HAZOP analysis we decided to take a two-fold approach: On the one hand a component-centred view of the robot system and on the other a operational one.
Massachusetts Institute of Technology (2002) 10. : Fault Contribution Trees for Product Families. In: 13th International Symposium on Software Reliability Engineering, pp. 231–242. IEEE, Washington (2002) 11. : Software Reliability: Measurement, Prediction, Application. McGraw-Hill, New York (1987) 12. : A Light-weight Approach Facilitating an Evolutionary Transition Towards Software Product Lines. D. thesis (2002) 40 C. Gómez, P. Liggesmeyer, and A. Sutor 13. : Introducing Fault Tree Analysis into Product Line Software Engineering for Exception Handling Feature Exploitation.