Virtual Ball Jont Location
Virtual Ball Jont Location
(OP)
Hello,
When using a multilink suspension that simulates a SLA suspension I understand how to find the virtual ball joint of one of the "a-arms" when the two links are in the same plane. I've noticed with most production car suspension it isn't that easy, and these links do not stay in the same plane. I'm getting confused on how exactly to find the location for the virtual ball joint when the two links that make up the virtual a-arm are offset vertically. Can some one point me in the direction of somewhere I can find more information on how to determine the virtual ball joint location for these instances? I found a nod from GregLocock about this issue HERE.
Forgive me if this is an ignorant question, I'm pretty new to all of this.
When using a multilink suspension that simulates a SLA suspension I understand how to find the virtual ball joint of one of the "a-arms" when the two links are in the same plane. I've noticed with most production car suspension it isn't that easy, and these links do not stay in the same plane. I'm getting confused on how exactly to find the location for the virtual ball joint when the two links that make up the virtual a-arm are offset vertically. Can some one point me in the direction of somewhere I can find more information on how to determine the virtual ball joint location for these instances? I found a nod from GregLocock about this issue HERE.
Forgive me if this is an ignorant question, I'm pretty new to all of this.





RE: Virtual Ball Jont Location
However the process is either to draw the suspension in some position and move it in small steps of angle and displscemdnt to the final location, checking that all arm lengths stay the same and BJ to BJ lengths on the spindle stay the same,
or do the whole thing as a kinmatics solution.
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Virtual Ball Jont Location
Thanks for the reply. This actually isn't a question regarding a FSAE car. I'm trying to completely understand how the suspension on my car works before I go making big changes to the spindle. Thank you for the idea of getting down to the roots and treating this like a kinematics problem. Embarrassing as it may be, I didn't think of going back to the fundamentals. I'm going to do some more research on the subject and then I'm sure I'll have more questions.
Thanks again
RE: Virtual Ball Jont Location
Cheers,
dynatune4xl
RE: Virtual Ball Jont Location
RE: Virtual Ball Jont Location
RE: Virtual Ball Jont Location
EDIT: After looking at that picture again, I think I need to explain my concern. When looking at the two links in plan view they look like they intersect each other much further from the center-line of the car than if one was looking at the two links from the rear view.
RE: Virtual Ball Jont Location
Cheers,
dynatune4xl
RE: Virtual Ball Jont Location
RE: Virtual Ball Jont Location
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Virtual Ball Jont Location
Cheers,
dynatune4xl
RE: Virtual Ball Jont Location
RE: Virtual Ball Jont Location
No, but you are right the tie rod is an integral part of the mechanical configuration.
I'd be a litle wary of any program that doesn't work the kinematics out from scratch even if it uses those calculations to build a look up table.
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Virtual Ball Jont Location
Besides that in order to understand the compliant behavior the suspension tool should allow some kind of deformations (bushing/rose joints/links) and the most commonly used commercially available tools do not have that either (setting aside of course all the MBS tools that are hugely complex and expensive). Do a search on the internet and you will certainly find one or two tools that can do the job.
Cheers,
dynatune4xl
RE: Virtual Ball Jont Location
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Virtual Ball Jont Location