Happy New Year!

Just to share a model for simulating a cone speaker. The speaker is just a hypothetical one.

Let me know if you see any errors.

Just to share a model for simulating a cone speaker. The speaker is just a hypothetical one.

Let me know if you see any errors.

liml

liml

cone shell model 2 - dynamic Damping.liml

1M

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## Comments

1) The elements at the center are collapsed quadrilaterals that are shaped like triangles, and all their center nodes are disconnected. To correct it, drag to select all 80 center nodes located at (0,0,13 mm) then use

Mesh tools -> Merge nearby nodesto merge them to one. Then useMesh tools -> Correct collapsed elementsto change quad8 to tri6.2) The elements on the dome part are flat in the radial/axial directions, so the dome is faceted rather than a smooth curve. If the shape should be a sphere, correct it using

Mesh tools -> Fit to curved surface. I haven't changed this because I'm not sure what the correct shape is.and two suggestions that aren't really problems:

3) Since it's axially symmetric, you can improve the performance a lot by modeling only one segment and using frictionless support to enforce the symmetry boundary conditions.

4)There's no need for the flat rings of elements around the outer edges that have fixed supports on them. You can put the fixed support directly on the edges.

Happy New Year! Thanks for your new year gift pointing the issues and giving suggestions.

Should I scale materials' mass accordingly of the one-segment model for modal analysis? I got very strange result without doing so.

Cheers.

Suktan

Did I make anything wrong?

Beware that modal vibration won't find any of the non-axisymmetric modes. It was OK for dynamic response because none of those modes would be activated.

Full 3D model's first mode is at 65.52 Hz. On the other hand, first mode of the one-segment mode is 279 Hz. Any idea?

Thanks.

I worked around it by removing the boundary condition from one edge of that element. That introduces a small error and the frequency is off by about 2%.