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I only the have the XYZ displacement from the customer. if I could just calculate the first order A and B from xyz displacement using equation y=A0 +(An * Cos n*Φ + Bn* Sin n*Φ) . That would be enough too. Thanks

Deformation. Ths shift of cylinder axis is the result of the deformation between top and bottom part of adjacent cylinders.

By rigid body motion I mean - Rigid shift of the cylinder axis with respect to the nominal axis.

Hello, I have XYZ displacement results for few cylinders. Is there a way I could remove any rigid body motion from the data. By rigid body motion I mean - Rigid shift of the cylinder axis with respect to the nominal axis. normally what I would do is fourier transform the data and remove first...

@rb1957 how do I do that?

From experience and the level of distortions I am getting from calculation is around 300 microns radially where we normally see around 100-170 um. I tried creating a new coordinate system on the top or each cylinders and resolving results in that coordinate system. The value are still in the 300...

Also this is an answer I got from someone. Unfortunately he is not responding anymore.

Maybe the distance I should calculate is the one shown with yellow line?

I use hyperview to view the results

I tried cartesian to polar conversion but the values I get are 3 to 4 times higher than what I expected.

Thanks for your reply. let's say a 3 cylinders of an in-line engine and the center coord system is on the center of the first cylinder top. What I want is the radial deformation of all these 3 cylinders from their XYZ displacement values based on the center coord system.

I tried both of the above suggestions but the results does not make any sense. I have attached an image for reference. Center coordinate system sometimes is at center of the cylinder sometimes it's not. because I have more than one cylinder. I tried trignometry and the values does not make any...

I have XY nodal displacement results for a cylinder from FEA. I wanna calculate the radius increase for each nodes. I tried using trigonometry to calculate hypotenuse of each nodes using X and Y data. But the results does not make any sense. Values are too high. Any ideas guys? Thanks in advance!