Calculate radial displacement from X,Y,Z displacements of a cylinder node

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Ash Ahamed 2020-2-12

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https://ww2.mathworks.cn/matlabcentral/answers/505106-calculate-radial-displacement-from-x-y-z-displacements-of-a-cylinder-node

评论： darova 2020-2-13

Hello,

How do I calculate the radial displacement of a node on a cylinder from it's XYZ displacement. 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 sense. Below is the code I used. M\aybe what I need to calculate is the distance shown using the yellow line.

I have attached a sketch for reference. What am I missing here?

r=sqrt(bsxfun(@plus, bsxfun(@plus,x.^2,y.^2),z.^2 ));

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Ash Ahamed 2020-2-12

I can calculate D using trignometry but it is not in the same plane as the node. let me try to update the image with more explanation.

Ash Ahamed 2020-2-12

What I would want to calculate with be the distance showed by yellow line.

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采纳的回答

darova 2020-2-12

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https://ww2.mathworks.cn/matlabcentral/answers/505106-calculate-radial-displacement-from-x-y-z-displacements-of-a-cylinder-node#answer_415296

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THe solution

x1 = x + x_;
y1 = y + y_;
dr = sqrt(x1.^2+y1.^2) - r;

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Ash Ahamed 2020-2-12

Thanks

in this case wouldn't the dr be in a new plane not the plane of the original node?

darova 2020-2-13

No. Radial displacement is always in XY plane

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