Dependability Modelling and Safety Sample Clauses

Dependability Modelling and Safety. Analysis with HiP-HOPS Through its Dependability package, EAST-ADL allows a model-based approach to ISO26262 by structuring and formalizing the related concerns. Based on this, a wide range of user support has been developed, including safety analysis, traceability and consistency management. Procedures Dependability Modelling with ME+ One key step in safety engineering is about risk assessment, for which the definitions of items, hazards events and safety goals are of particular concern. With EAST-ADL dependability modeling support, the safety engineers capture these concerns as well as their dependencies according to ISO26262. See Figure 5-1 for an example case. Figure 5-1: Dependability model structuring information related to a safety goal. Based on the language, a well-maintained traceability from the safety concerns to related requirements and artefacts in system specification is achieved. The figure below shows one result of the ME+ tool support for automatically deriving the related nominal architecture solutions that an safety item (BasicBraking) has due to its FeatureFlaw declaration (UnwantedDeactivatoin). Error Modelling with ME+ To derive more detailed functional and technical safety requirements, error modeling and safety analysis in terms FTA&FMEA become necessary. To this end, EAST-ADL allows the engineers to precisely declare the plausible error behaviors of a system and thereby to synthesize the fault trees automatically. Figure 5-3 below shows the error model of a braking system, where the blocks represent the error models of individual functional units and the links represent the error propagation channels due to communication links or allocation relations in the design. Figure 5-3.Error model defining the faults and error propagations within a braking system. For the reason of usability, the ME+ tool can automatically generate an initial error model that contains the error model blocks and error propagation links according to the structure of corresponding architecture model. Within each error model block, there are declarations of error behaviors capturing the logics relating some failures to the faults causing their occurrences. Figure 5-4 shows the error behaviors declared within the error model pBrakeActuator_AllWheel (shown as the rightmost block in Figure 5-3) for capturing the combinational effects of individual wheel braking failures. Currently, the declarations error behaviors need to be added manually by the engineers.
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Related to Dependability Modelling and Safety

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