Getting some wierd ackerman results

[rcx194]

I've been working on my suspension geometry. I've come to setting my ackerman but something started going weird. To get Lotus Suspension Analyser to show 100% ackerman I had to move my out rod ends really far. So I did a 2D sketch in Solidworks and it confirmed that Lotus is well out.

Below are screenshots of Lotus Suspension Analyser showing 32% ackerman, and my model in solidworks, which has the exact same geometry with a 2D sketch (in blue) showing that my steering is in fact set to 100% ackerman.

I've run out of steam now so don't know why or what to check. I've double checked that Lotus has the correct wheelbase and it does. I'll do some more checks soon but thought someone might have ideas for what to try.

 

[GregLocock]

I don't believe the lotus plot, maintaining Ackermann at a constant value through the entire suspension travel is most unlikely.

if you plot toe vs travel you should be able to confirm if you have managed that rather unlikely feat.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

http://eng-tips.com/market.cfm?

 

[rcx194]

Thanks Greg. That's very worrying though, I should run my geometry through another software then in case it's made other mistakes.