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Finding ackerman measurement

Finding ackerman measurement

Finding ackerman measurement

(OP)
Can anybody tell me what the ackerman would equate to in this drawing? Thanks.

RE: Finding ackerman measurement

(OP)
Uploaded the pic, but don't see it....

RE: Finding ackerman measurement

What drawing was my question.

Regards

eng-tips, by professional engineers for professional engineers
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.
 

RE: Finding ackerman measurement

since we are on the topic does anyone have some standard formulas for ackerman percentage vs. steering geometry? I tried to derive them myself but got pretty bogged down and thought someone must have done it already. I have not been able to find a diagram with accompanying equations in the texts I have available.

RE: Finding ackerman measurement

"The Automotive Chassis Engineering Principles
J. Reimpell H. Stoll J. W. Betzler.
ISBN 978-0-7680-0657-5 "

Has a very thorough discussion of how you get from the difference in front wheel steer angles (aka wheel cut angles aka steering error aka delta toe) to Ackermann.

Working out the steer angle error can only be done simply for very simple geometries, otherwise you need to consider 3d angles. If you have a double wishbone geometry then wishbon.bas will work them out.





 

Cheers

Greg Locock

SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.

RE: Finding ackerman measurement


 % Ackerman = ( ai - ao ) / ( aic - aoc )


where: ai
 =
 inside wheel steer angle
 
ao
 =
 outside wheel steer angle
 
aic
 =
 inside wheel steer angle required to have the wheel plane perpendicular line intersect a line passing through the rear axle at the center point between where the inside tire perpendicular intersects the axle line and where the outside tire perpendicular intersects the line.
 
aoc
 =
 outside wheel steer angle required to have the wheel plane perpendicular line intersect a line passing through the rear axle at the center point between where the inside tire perpendicular intersects the axle line and where the outside tire perpendicular intersects the line.
 
 
 

Cheers

Greg Locock

SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.

RE: Finding ackerman measurement

Thanks Greg, the equation should give me enough to start with and ill see if I can hunt up a copy of Ren and Stimpy.

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