mbse:alstomasap
Alstom ASAP methodology: Advanced System Architect Program
Overview
The quality of the system specification is the corner stone for top-down Rolling Stock development (from Customer requirements/needs to product solution). The evolution of railway operators position makes that approach (top-down instead of bottom-up) mandatory.
Therefore it was crucial for Alstom to put in place an efficient top-down approach by using Requirement Based and Model Based System Engineering (SysML) as an efficient implementation solution.
The top-down approach mainly consists in:
Manage and develop input requirements up through the system engineering, detailed design up to system verification and validation
Develop a train operational analysis to elicit costumer use cases and needs
Develop a train level functional and constructional architecture which cover train level requirements and use case
Develop the sub-system level functional and constructional architecture which cover sub-system level requirement and which is coherent with what defined at train level.
Requirement Based solution mainly consist in organize all the requirements in a database in order to be able to derive and allocate requirements to different modules which are linked to a specific part of the system architecture (Train or sub-system). That solution permits also to easily manage the change, follow the requirements evolution and create links with the part of the architecture which covers it.
Model Based solution consists in depicting the System operational analysis, the System and Subsystem architecture (functional and constructional) with SysML:
the operational vision elicits and specifies the environment and the specific needs of the customer of the system (the train),
the functional vision specifies functions of the subsystems that will cover customer usage and needs,
the constructional vision specifies the system configurations that will be implemented in order to perform functions and hence fulfil customer usage and needs (see the figure below).
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ASAP methodology is tool-free because no specific language stereotypes or tool profile has been created. Nevertheless the used tools are DOORS for the requirement management and development process and Atego Artisan for the SysML modelling process.
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mbse/alstomasap.txt · Last modified: 2013/02/26 10:37 by jcwatson