Real world loads
Real world loads
(OP)
I'm having some FE work done to assess the affects of modifying a front upright. Could yourselves give me an idea of the load profile I should be using, I'm thinking that the tyre contact patch average and peak loads in terms of g would be useful?
Thanks, Colin.
Thanks, Colin.





RE: Real world loads
Cheers
Greg Locock
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RE: Real world loads
If it helps judge my question, the job is to assess the effects of lowering the wishbone/trunnion pivot on a TR6 front upright.
Colin.
RE: Real world loads
There are good reasons for those numbers, for a production car, and they are by no means unreasonable. 3 2 1 is commonly used for circuit cars and prototypes, but would run into problems with potholes and kerbs, in particular. We've run an aluminium suspension designed to 321 for 6000 miles or so, on public roads, so it is does not result in a particularly fragile design.
I wouldn't think twice about your proposed mod, the forces in the spindle won't change appreciably, and I'm pretty sure the original part was a belt and braces design. Hmm, messing about with roll centres? Check your roll steer curve.
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: Real world loads
My concern about things started from looking at what I saw as an increased moment on the lower threaded stub part of the upright that the trunnion screws onto. Here in England, I've tried to track down older Triumph people that might know how the loads were assumed to be taken, by the trunnion part in particular, but without much success. It has a plain bearing area immediately above the thread which I've come to regard as provided to take the lateral components and for the thread to deal with the vertical, at least while the clearances are good anyway.
The lowering proposed includes moving the upper ball joint down too. There's a weld to make at this end but I feel sure I can know it's good by examination.
Thanks, Colin.
RE: Real world loads
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: Real world loads
RE: Real world loads
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: Real world loads