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Here is a webpage with a number of videos, both experiments and matlab animations, of balls and people bouncing on a trampoline. Also, links to a paper in PLOS ONE.

http://movement.osu.edu/webpages_for_papers/seatdropwar2013.html

The interesting phenomenon is that when two balls are in simultaneous contact with each other, there is a dramatic energy transfer from one ball to the other.

Here is an article in Popular Science about the phenomenon:

Hi,

Is there a free/open-source mesher for the Spectral Element Method?

I know some researchers use a conventional mesher with order 3 elements
and then include more nodes in the meshes (but without improve the
geometric interpolation).

Thanks in advance,

2 question

1) how can i do p-delta analysis in ansys  ?

2) how can i determain dynamic responses ( frequencies and mode shape ) from results of p-delta above in ansys?

Hi,

I am doing the beam tutorial in ABAQUS and I get the mises stress output as given in the tutorial document (ABAQUS manual appendix B).

I am trying to understand the S11, S22 and S33 outputs from this model. The document I am using for my steps are attached. Couldn't attach my .cae file here.

Hi all,

Hello,

I am doing a project on rubber couplings and it is a bit difficult for me to decide between the material models availavle in Ansys 14. I am new to this field and want some assistance in choosing the material model. So, can anyone help me to theoroticall explain the difference between the different material models available in Ansys? 

How to find a response for a pinned-(pinned+ torsion spring) column with sinusoidal axial load?

I am unable to decouple the equations in space and time using variable separable method, with one end pinned-other end pinned with torsion spring as boundary conditions.

Can anyone please help.

Good day.

--

Rajnish