January 27, 2021 at 7:19 amalvincslSubscriber
I am trying to run a RBD simulation on a single pendulum. I've created a pendulum model, with the angle of 30 degrees and added standard earth gravity onto the model (+Z Direction) in order to create inertia. However, the results of the pendulum showed that the velocity of the pendulum doesn't slow down and remain at maximum value at every swing.
I tried to apply frictional coefficient on the contacts as well as the joint connections but it's not working. Anyone knows how to resolve this?
Thanks in advanced,
AlvinJanuary 27, 2021 at 11:01 ampeteroznewmanSubscribernWhat do you mean contact and joint?nDo you mean you have one model with a joint and another model with contact?nOr do you mean the model has both at the same time? That would be a mistake.nTry using contact only and no joint.nJanuary 27, 2021 at 11:59 amErik KostsonAnsys EmployeeYou need only one - just use a cylindrical joint and add friction.nnEriknJanuary 27, 2021 at 2:08 pmalvincslSubscriberthe shaft and the head of the pendulum are joint with only allowing rotation at z-axis. But the ?Connection? branch showed ?contact? between the two surface, hence I thought they are in contact but frictionless. nThe result of the dynamics showed the velocity of the pendulum remain constant throughout the timestep, so I wonder if it?s because I?ve set it to frictionless? What should I do to let the motion of the pendulum decrease over time? nJanuary 27, 2021 at 2:10 pmalvincslSubscriber@ekostomnthank you. Can you give me more context on the method you mentioned? Do you mean I should change the connection from revolute type to cylindrical? nJanuary 27, 2021 at 2:33 pmErik KostsonAnsys EmployeeSo use the revolute joint you have, add friction to it, inner and outer radius, and delete the contact.nnSo use only a rev. joint (no contacts).nnFor more info about joints search say in the ansys help manual for:nJoint and frictionnEriknJanuary 28, 2021 at 3:07 amalvincslSubscriberArrayThanks for the reply! It works! nSo I won't be needing any Frictionless Contacts between two faces? Just need a Revolute Joint on those two faces are fine?.January 28, 2021 at 10:58 amErik KostsonAnsys EmployeeCorrect- all the best.nnEriknnMarch 11, 2023 at 9:41 pmViewing 8 reply threads
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