# Morpher Problem

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 June 1, 2012, 11:17 Morpher Problem #1 Senior Member   Henry Arrigo Join Date: Jun 2010 Location: Italy Posts: 100 Rep Power: 9 Sponsored Links Hello all; I use rigid body morpher to enforce a cylinder to move in a sinusoidal manner. but the problem is that although the equation has the amplitude of 0.02, the cylinder move more than this value (even more that 0.1). is there any extra setting that I should do? I don t know what the difference between "Displacement" and "Rigid Body" options in morpher model. tnx
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 December 11, 2013, 11:02 #2 Member   Arun Krishnan.L.H Join Date: Jan 2013 Posts: 75 Rep Power: 6 Hey Henry, I know it is a late reply. But did you find out how to do it? If you have not I have done a similar problem of cylinder heaving,swaying and rolling sinusoidally at a free surface. Thanks Arun

 December 27, 2013, 16:11 #3 Senior Member   Henry Arrigo Join Date: Jun 2010 Location: Italy Posts: 100 Rep Power: 9 thanks arun. No i haven t done that yet. I had several attempts but non of them was successful. when I set the predefined position the body movement overpasses the limitation of the position, like when i defined z=0.2sin(t) m the body movement become more than 0.2 m. what was the strategy you chose?

 February 3, 2014, 03:45 #4 New Member   nico Join Date: Sep 2012 Posts: 3 Rep Power: 6 I'm pretty sure the issue is that you're specifying the position while you should be specifying the displacement. I.e. displacemen at time t = position at time t - position at time t - 1

 August 25, 2014, 23:12 #5 Senior Member   Joshua Counsil Join Date: Jul 2009 Location: Halifax, Nova Scotia, Canada Posts: 366 Rep Power: 11 Hi Arun, I'd love to have a copy of that simulation if you still have it and don't mind sharing. I, too, have a forced rolling object at the free surface. As of now, I have a Rotation Motion specified with a field function. Unfortunately, CCM+ requires an angular frequency input and I only have the displacement equation: [angular displacement at time t] = [angular amplitude] * sin([angular frequency]*[time]) I'm not sure how to go about specifying angular amplitude to generate the desired displacement. Cheers!

 August 26, 2014, 04:39 #6 Member   Arun Krishnan.L.H Join Date: Jan 2013 Posts: 75 Rep Power: 6 Dear Josh, That is not a problem at all. Can you send me your e mail id and I shall send the models for heave, sway and roll. Thanks Regards Arun

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