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Old   June 1, 2012, 11:17
Default Morpher Problem
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Henry Arrigo
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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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Old   December 11, 2013, 11:02
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Arun Krishnan.L.H
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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
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Old   December 27, 2013, 16:11
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Henry Arrigo
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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?
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Old   February 3, 2014, 03:45
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nico
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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
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Old   August 25, 2014, 23:12
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Joshua Counsil
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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!
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Old   August 26, 2014, 04:39
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Arun Krishnan.L.H
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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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