3D Spline to simulate a nonlinear damper. How to change z values ? HELP

[xocalhinho]

Hi everyone,

I’m developing a 7DoF full car model on ADAMS view. I know about ADAMS car but doing this on view was an option made early for my dissertation.

Everything so far is parameterized in order to be able to run a DoE to do a dynamic optimization.

I’m using a 2D spline to define the damper curve data. To be able to optimize the suspension I defined a 3D spline with the different damper curves (force vs speed) where the first column (x column) is velocity and the others (y columns) are force and the z column correlates to the y column number. The idea is to create a Design Variable to change the y column that is being used. That spline is on the option ‘Spline: F=f(velo)’ in the spring properties.

QUESTION: What I can’t understand is how and where to change the z column (value of the design variable) that defines the force (y data) on the damper.

QUESTION: Does anyone know what I am missing?

Thank you for your help in advance!


Sérgio

 

[GregLocock]

You need a piece of solver code that looks like this

! Open loop variable ids
!
VARIABLE/9799
, FUNCTION = 1 ! Smart Driver Input Signal

Which sets variable 9799 to a value of 1

Whether you can construct a DOE that alters variables I do not know.

Cheers

Greg Locock


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

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[xocalhinho]

Hmm, no other way around that?

I thought that it was possible to do it with Design Variable and 3D spline without anything like that. following the same idea when you define a DV with the spring stiffness values... Isn't that possible?

The thing is that I never wrote any code for the solver...

Thank you for your reply

 

[GregLocock]

View probably has a less cumbersome way of doing it, but I only use it about once a year. You could alwys try MSC support.

Cheers

Greg Locock


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

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

 

[xocalhinho]

Ok, thank you. Yes I post a message in their forum but I'm still waiting...