stress analysis on moving object?

hello, as u can probably figure this isan engineeringproject thing.


i have a design for a spring-powered model dragster. for stress analysis on the body (using cosmosworks) basically there is a force (from the tension from the spring) 'inwards' from a connection from the back, and from the front.


i'm not sure what to do with restraints however?.. ie it wont be restrained; it will move. i tried not restraining it, and restraining it only in the vertical plane, but it was having none of it.


any ideas? (asap please! )

ie... if its restrained then the stresses on it will be different? and restrain the front, or front and back?..


both being from a tension, the forces will be the same anyway so, as far as the model of the body is concerned (ie no axles etc) it shouldn't move anyway..

Hi,


analyse the worst scenario case. Spring pushing drugster but it not moving forward ( not working chassis ).