Design for Availability – Flexible System Evaluation with a Model Library of Generic RAMST Blocks
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Abstract
Tailoring a complex system to meet given availability requirements is a challenging task in the design process. Besides compiling the applicable mtbf and mttr figures of the required components, the specific set of algebraic rules has to be identified and applied to compute the overall predicted availability of the designated system functions for the individual architecture and for individual usage profiles. While on the other hand model based methods have meanwhile become established in the system development process, such time- and effort-saving simulation-based approaches
are by far not so common in the field of RAMSTanalyses. This contribution reports about an approach of amending a reusable library of functional component models - originally designed to explore the effect of assumed failures in complex networks by simulation - and applying it to compute the availability of a generic launcher system. Here the design engineer is faced with the complex task to find an architecture to guarantee a specified availability of the firing function with the given resource items onboard. Developed within the tool environment RODON, the
developed prototypical library enables a quick evaluation of structural design alternatives of the selected launcher application. On top it supports the full range of RAMSTanalyses - like computation of cause-effect-relationships for FMEA, automatic drawing of FTAs for hazards of loosing designated system functions or systematic evaluation of the Diagnostic Coverage resp. potentially monitor or reconfiguration strat1egies - based on the same single model. Further generalization activities are going on. Since the model is composed of generic qualitative building
blocks, it took much less time to develop than full quantitative or physical model descriptions usually need. Although this qualitative representation implies certain limitations, as the authors experienced this is compensated by the advantage of an easier understanding by the modeler and quick adaption and to new principal architectures, while still providing sufficient system insight and result. Driven by requirements from the industrial application, ideas for further library extension are being discussed to support also questions regarding repair procedures and time, resource allocation or cover even economical aspects. The paper sections focus on the description of the launcher design task, a short introduction to the applied tool, the library development and application and finally the results and outlook.
How to Cite
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prediction, reliability, availability, Safety, Model-based, Maintainability, Testability, RODON, Library
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