MSC ADAMS VIEW

[warden_clyffe]

Hi everyone,
I can't understand contact forces in Adams View. How can i decide value of stiffness, force exponent, damping, penetration depth, stiction velocity and friction velocity? Is there a any equation about this terms?

 

[GregLocock]

The equations are in the help. The values are, I am afraid, experimentally determined. If it solves then you've got the right ones.

Cheers

Greg Locock


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

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[warden_clyffe]

I designed a full car in 1 year. It has 122 DOF, hundreds of contact, 134 moving parts and 147 joint. System is working but in some different velocities and road types model stopped a little bit after. Each of my analysis takes about 6, 7 hours for 45 second analysis. So i tried too much values to optimize contact but i can't do it exactly. I find these values for a basic model. But it's not working for a complex model. Do you have any advice?
Thanks for to answers.

 

[GregLocock]

" 122 DOF," for a full car? I run about 600 or more, and my models are simple.

My advice is that building a full vehicle model in View is too hard. Use /Car.

Cheers

Greg Locock


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

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

 

[warden_clyffe]

I used /Car and made same model and it is too simple. You are right, but i am trying make a full car in Adams View. And when i compare some results Adams Car and Adams View model, these results almost same. I try to figure out which parameter or parameters made failed analysis. Because in low speed my model is working perfecly and results same with my /Car model. And this way i am gonna learn what is the /Car default model parameters. So i am not working anywhere or something. I am student and it is just a curious. I am trying to find steady contact with 2 steel materials, not impact. But as far as I understand, I need more time to figure out contact parameters.
Thank you for answers.

 

[GregLocock]

I don't have any contacts in my Car models, as standard.

Cheers

Greg Locock


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

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

 

[warden_clyffe]

But there is a default contact with tire and road. Just /Car don't show this us. Isn't it?
Thanks for your answers.

 

[GregLocock]

It is a contact, I am 99% sure it does not use the CONTACT formulation. Similarly jounce bumper engagement is handled mathematically, not via a CONTACT statement. Basically for fast and robust models you try to avoid CONTACT (and FRICTION).

Cheers

Greg Locock


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

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

 

[warden_clyffe]

Thank you for your help. Have a good day.