How to plot plate mode shape with thickness

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susanta behera 2016-2-12

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https://ww2.mathworks.cn/matlabcentral/answers/267789-how-to-plot-plate-mode-shape-with-thickness

编辑： Gagarin 2024-11-30

I want to plot rectangular plate mode shapes in free vibration. I am able to surface plot the mode shape with (x, y) meshgrid and deflection (w) matrix. My problem is i can not show all the displacements (i.e. u, v and w) which will be shown as a 3D deformed plate (showing thickess, as shown in the reffered fig below). The exact kind of plot which i want can be found in page-7 of paper titled "Three-dimensional free and transient vibration analysis of composite laminated and sandwich rectangular parallelepipeds: Beams, plates and solids". Link for the paper is: http://www.sciencedirect.com/science/article/pii/S1359836814006118 I am also attaching the images from page 7 here:

Important: side surfaces must show deformations (either u or v) except for clamped BC case where those must be straight. Can anybody help me please

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Gagarin 2024-11-30

编辑：Gagarin 2024-11-30

Hi susanta sir, can you share your code to plot the modeshape of plate in MATLAB ?

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Answer 1

Mike Garrity 2016-2-12

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https://ww2.mathworks.cn/matlabcentral/answers/267789-how-to-plot-plate-mode-shape-with-thickness#answer_209588

在 MATLAB Online 中打开

Here's a simple example that might get you started:

thickness = .2;
[x,y] = meshgrid(linspace(-3,3,40));
% replace this with your deformation
z = cos(x).*cos(y) / 5;
c = z;
% top & bottom faces
surface(x,y,z+thickness,c)
surface(x,y,z-thickness,c)
% Now the 4 sides
surface([x(1,:); x(1,:)],[y(1,:); y(1,:)], ...
        [z(1,:)+thickness; z(1,:)-thickness],[c(1,:); c(1,:)])
surface([x(end,:); x(end,:)],[y(end,:); y(end,:)], ...
        [z(end,:)+thickness; z(end,:)-thickness],[c(end,:); c(end,:)])
surface([x(:,1), x(:,1)],[y(:,1), y(:,1)], ...
        [z(:,1)+thickness, z(:,1)-thickness],[c(:,1), c(:,1)])
surface([x(:,end), x(:,end)],[y(:,end), y(:,end)], ...
        [z(:,end)+thickness, z(:,end)-thickness],[c(:,end), c(:,end)])
view(3)
axis equal

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susanta behera 2016-2-13

Sir I have modified your code with my data to get the mode shape as given below. My concern is that i can only give z(W0 file) deformation to the (x,y) grid, but could not give deformation in x and y direction(see the U0 and V0 dat file). Please suggest if there is a way to do that. Here I have uploaded the data files with codes: thickness = .1;

[x,y] = meshgrid(X,Y);

% replace this with your deformation

W=transpose(W0);

z = W;

c = z;

% top & bottom faces

surface(x,y,z+thickness,c)

surface(x,y,z-thickness,c)

% Now the 4 sides

surface([x(1,:); x(1,:)],[y(1,:); y(1,:)], ... [z(1,:)+thickness; z(1,:)-thickness],[c(1,:); c(1,:)]) surface([x(end,:); x(end,:)],[y(end,:); y(end,:)], ... [z(end,:)+thickness; z(end,:)-thickness],[c(end,:); c(end,:)]) surface([x(:,1), x(:,1)],[y(:,1), y(:,1)], ... [z(:,1)+thickness, z(:,1)-thickness],[c(:,1), c(:,1)]) surface([x(:,end), x(:,end)],[y(:,end), y(:,end)], ... [z(:,end)+thickness, z(:,end)-thickness],[c(:,end), c(:,end)])

view(3)

xlabel('x') % x-axis label

ylabel('y') % y-axis label

zlabel('z') % z-axis label

%axis equal

P.S. The side surfaces must show deformation instead of being plane (ex. the front x-z face shoud also show the deformation instead of being a plane parallel to x-z plane). The same mode shape in FE is as shown below.

Mike Garrity 2016-2-16

The technique for drawing it would be the same, although you might want to add more vertices to the side panels.

The difference is that you're going to need to compute the deformation for all of the additional points rather than just connecting two copies of the deformed plane.

If your deformation is a 2D array, then you're going to need to do some computation to figure out where points which are a distance from the centerline are going to move to.

zainab malik 2018-11-14

How could we add a patch of any material at the position where there is maximum deflection if we do have the dimensions of the patch?

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How to plot plate mode shape with thickness

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