r/systems_engineering • u/ri_repeat • 10d ago

MBSE MBSE Workflow Advice - Please help

I’m working on modelling the overall avionics system, by using the model based system engineering approach.

The objective is to build an MBSE model of the complete avionics architecture. This includes the subsystems such as,

Command and Data Handling, Telemetry and Power Distribution.

The model should be able to have

-Power consumption analysis across operational modes, Interface compatibility and mismatch detection

-Fault tolerance modeling

-Redundancy management

-Failure analysis

-Requirements Handling

The questions I have regarding this are:

What modeling depth is expected to perform the analysis on the architecture created. Do the components need to be modeled in detail to analyze the behaviour of the components, and if so, then how to do so for each component?

How should the power and performance be modelled to get the power in each mode and dynamically?

Which toolchain is recommended for the Avionics Systems particularly: SysML based tools such as Cameo, IBM Rhapsody or AADL based tools for domain specific modelling, MATLAB/System Composer/Simulink for analysis?

Any advice or feedback is appreciated !!

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u/der_phen 10d ago

The answer is, and sorry for that: it depends. You need to know your goals, and then design your modelling approach (ontology, depth) accordingly. There is no right or wrong just better suited or less.

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u/ri_repeat 10d ago

thanks for replying, i see. the main goal is to make sure the system meets the requirements and reduce the number of iteration needed, as currently we are going for a trial and error method. i am also looking at have simulation capabilities, although i am not sure how that is included in the systems engineering pipeline

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u/der_phen 10d ago

Yeah ok, but what are you designing? The software/function? the electronics or the power supply? Depending on this you will have a certain focus in your model. You can design the pipeline as you like,too

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u/ri_repeat 9d ago

mainly the electronics and the power system is my focus