Hi everyone,
So I am trying to add the suspension geometry into CarMaker via IPG Kinematics and have successfully opened it via an skc file.
My question is what exactly does it override because it seems that changing both the suspension spring values in Kinematics and in the carmaker window both seem to have an effect on the car even after opening the new skc. The stabilizer has a similar thing.
Also, the mass, does this only effect the suspension and not the cars true mass?
I have read the manual but it seems unclear what is in control of what when using the skc file.
Thanks in advance to anyone who can help…
Scott
As the Forum is growing more and more, we would like it to start been self-sufficient. That said I will encourage one of the other users to try to answer this question. I think that many of you are very proficient at IPGKinematics at this point. We will greatly appreciate your contribution!! I can afterwards add any necessary corrections or extra information.
It seems that nobody has answered in 2 years. Can you answer this question, please? I am also confused about this question. Thanks.
IPGKinematics is a multibody tool that can simulate suspencions. It has 2 uses:
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For analysis of suspension, which is what is been simulated and observed in the log tables after the start button is clicked in IPG KInematics.
and can also be seen if the results are saved; as a seriers of .erg .txt .kex .fmt etc
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For obtaining an SKC file. By clicking on “Save CarMaker files only”, you can prevent all the other files from been created.
the skc file (and simulation results) will heavily depend on the parametrization that you choose.
There are 2 ways of simulation suspensions in IPG Kinematics:
a. Forces On: This consideres the hardpoints, the bushings, the masses and all the forces specified.
This mode then not only calculates the geometrical suspencion movement, but also all of the
deflections from the bushings. This is very hard to paramtrize, as all the parameters have to be
correct to give meaningful results.
b. Forces Off: This is a simplification of Forces On and it only considers the Geometrical inputs (AKA Hardpoints) of the suspencion.
What is a SKC file?
With short words it is a way to describe the suspencion of a vehicle by mapping the translation (tx ty tz) and rotation (rx ry rz) of the wheel as it moves up/down (q0) and steers left/right (q2). It also maps the amont that the different suspencion force elements, such as the spring compress and enlongates (lSpring lDamp lBuf lStabi). A healthy SKC file is full of non zero values that corresponds to each combination of wheel compression and steering.
How does everything works together?
I. You input your hardpoints in IPGKinematics (Forces Off recommended) click start, and get an SKC file. For Forces off the masses and spring definitions in IPGKinematics is irrelevant.
II. You select this SKC file in CM. This SKC has all the information required to emulate a bare suspencion.
III. You define your suspension elements in CM. Just like in a real car, you can have a finish suspencion and swap out the spring, damper and swaybar.
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