Thanks for the reply chris, I actually PM'd mike after reading his thread! the information within is priceless however it didnt quite answer my specific question.
Hopefully mike or others can provide there opinions.
Hi all,
The question i have may not be best suited for this forum but i always seem to get sensible answers here! I have not found an answer too this after searching and searching...
If my Rear geometry provides better performance in roll than in bump in comparison to my front axle...
I don't want to confuse the issue further as i really need to finish these calculations in order to complete my disertation :0 however, I can explain why i have this issue...
Following the Allan Stanliforth book weight transfer calculations i obtain this calculation for spring resistance;
(SF...
Hi Mike, thanks for the reply.
I am trying to calculate the impact a roll bar has on chassis roll / weight transfer and simply need to understand whether the calculation i did gives me a good representation in reality. otherwise as i am sure you know i could design a bar that will useless or...
Can somebody help to validate my formula? I believe the following can be used to calculate anti roll bar resistance;
(Roll Bar Rate / (Wheel movement / Relative roll bar pickup movement)^2) * Track Width^2 / 2*Pi / 180 = Roll Bar Resistance
My knowledge is limited so other than pondering...
I have an equation taken from a book that when converting from imperial to metric gives me the complete wrong answer when converting back afterwards... it seems simple but I am obviously missing a trick, can anybody help?
Imperial Equation
Angular Rate / (Lever Length2 x pi /180) = Roll Bar...
Thanks for the quick response guys I've been looking at this psreadsheet / book all day..
could somebody validate this equation for me? does it look correct?
80GPA x Pi x 9.81 (OD4^ - ID^4) / Bar Length = Angular Rate in Nm. kg. per degree
Thanks rollcast, that's exactly why i am confused because for steel i am expecting approximately 80GPA, but to make all the calcs make sense i need an average number equal to 350,000 :/ derived from 19700
I am reading the stanliforth suspension design
he refers to it as The "19,700" is a...
I am reading through some calculations in a book that refer to an average shear modulus of steel (19700)...
they give no units and it has completely thrown me off track while following through the calcs can anybody help?
I know the unit is imperial and if i convert some of the other units...
Hi,
I am trying to calculate weight transfer from the front to rear of a vehicle and have already calculated the total sprung weight to be transfered.
I now need to calculate the Roll resistance generated by the springs using the following forumula and this is where the error occurs...
Thanks very much jack, that has confirmed many of my assumptions, the book still seems to refer to the opposite wheels as front - rear but i assume this will depend on whether it is a single wheel impact or twin.
Your help is much appreciated thanks
Hi Mike,
Yep, although i expect my plans to change slightly as i do more research I am already collecting materials and reading up on a lot of the what to and what not to do.
I am very confident that the design and build project will be successful, I have an interest in the 1993 Renault...
Yeah i managed to get a paperback version for £60 the most i have ever spent on a book but as you say well worth a good read and the calculations are all there, my next step is simply to understand them fully :)
I can appreciate the difficulty in predicting maximum chassis loads and that...
Ok well to many this is going to seem like a really stupid question I am sure :/
I need to calculate Maximum Torsion in a chassis, to start with i want to look at collisions or rough terrain;
Assumed 3g bump applied diagonally
Assumed bump 150mm high
Overall factor applied 1.5...