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frame (chassis) modeling

frame (chassis) modeling

frame (chassis) modeling

Dear Experts,
I have a query regarding the 3d chassis(frame actually) modelling of a heavy vehicle let us say a tractor/excavator .I am new to designing the chassis framework so need some advice on "What parameters drive the frame design"?
I have seen some chassis examples from different makes and found in some cases the frame longitudinal members shapes are not even a standard channel/box shape ... how do we determine the shape of the same? (is it some sort of iterative process or somewhatmore methodological)
I posted this query on automotive body engineering also but didn't get any response so posting it in this forum.
Thanks for your suggestions.

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