How to have a car follow a track in kinematics?

[ntweisen]

Hello! I'm trying to simulate a new type of roller coaster in CATIA with the DMU Kinematics workbench. Currently, I can do any hills in a straight line perfectly fine (

http://www.youtube.com/watch?v=7pULdDEjwZM),

but I can't seem to get it to go around a horizontal curve. I have deactivated the upper chasis as seen in the video in order to just get the lower chasis to follow the curve. I have 8 roll curve joints between the 8 road wheels and the wire frame sketch on top of the rails. Any idea on why the car won't negotiate the turn? It gets to the point pictured above and then stops. Is there a better way to have the car follow the track other than using a ton of roll curve joints?

http://excelspreadsheetshelp.blogspot.com

 

[marcofa]

If you do contact on LINES (track wheel) when car start to turn, contact line remain for small wheels but not for big wheel that have to slip over the track (wheels staight and track curved). When car move up or down the problem is opposite, big wheels ok small wheels slips.
Do contact with surfaces
Marco

 

[ntweisen]

Thanks, I figured it out!

http://www.youtube.com/watch?v=P2v3QOhrKPk

http://excelspreadsheetshelp.blogspot.com

 

[marcofa]

BEAUTIFULL !!!
Marco

 

[ntweisen]

So now the question is how do I apply gravity to the model so it hill roll down a sloped track on its own?

http://excelspreadsheetshelp.blogspot.com