Contatcs in motion view

Tejas

Hello, I have one assembly where plunger is travel horizontally (given velocity 11mm/sec) and rotate the  fork in clockwise direction  and fork will stop at other extreme end due to presence of solid link in assembly. But, due to plunger movement the fork is get penetrated  in other link.

1.what can I do here to stop fork getting penetrated in link the contact is given there ( default values)impact still I am facing problem.

2. what is are different types of contact defination in motion view ? are they like Ansys?

3.can I give plunger only displacement to a particular value say 8mm?

Thank you in advance

GTT Adam

Hi Tejas,

There are several different ways to constrain this mechanism, depending on your desired outcome.

It sounds like your system is like a rack and pinion, where one body moves in translation while another moves in rotation:

However in your model, there is also a hard stop at one end to stop the rack from moving too far. 

To have the plunger/rack stop at contact, the movement of the plunger/rack must be done by a Force entity and not a Motion entity. If you are using a Motion applied to a translational joint, the Motion will do whatever necessary (apply as much force as needed) to overcome the Contact to achieve the target displacement, velocity, or acceleration profile you have defined. 

There are several different contact formulations in MotionView with give the User options for how they want to define the contact. The formulation type will depend on what information you have about the bodies coming into contact. In general, the Impact (default) method will be more than suitable.

For more on each formulation, you can use the following link: https://help.altair.com/hwsolvers/ms/topics/solvers/ms/xml-format_57.htm?zoom_highlight=contact 

 

If you wanted to limit the displacement of the plunger/rack without using a Contact, then you could apply another Force and use the BISTOP function: https://help.altair.com/hwsolvers/ms/topics/solvers/ms/bistop.htm?zoom_highlight=bistop

The BISTOP function can be defined so it will apply a force on a body when it moves beyond a certain displacement value. The amount of force it applies will use the same formulation as the Impact-type contact, as you'll see similar coefficients defined. The results will be nearly identical to using the Impact-type contact, however you do not need to define the second body for contact. 

 

Hope this helps!

Adam Reid

Tejas

Thank you for your reply Adam