Can anyone think of a way of setting up a Beck's column?

[hugary1999]

Hi all,

I am studying the dynamic instability and post-critical wave-like oscilation of Beck's column. I want to get some experimental results to compare to the analytical solution.

A Beck's column is simply a cantilever beam with a tangential follower force at the tip.

One experiment we have done was using rubber tube (like garden hose). The water jet coming out of the tubing is equivalent to a follower force. There should be a critical load or critical volume flow rate where the tube becomes unstable, and that value compares well with the theoretical value.

Now we want to set up the experiment in another way so that the follower force is more "controllable" -- it was just a rough estimate to relate volumetric flow rate and force magnitude, plus we want to have the follower force acting on a real beam or slender rod.

One way we have come up with is using wires and magnets, but it's tougher than expected to set it up such that the force is always tangential to the beam.

So this is more of a thread looking for ideas rather than solving problems. We have some budget so please do not limit your imagination within what I've mentioned.

Thanks

 

[GregLocock]

To be honest your original solution was so neat I don't think you'll better it! I assume you need a dynamic system, that maintains constant force, but varying direction, as the column buckles?



Cheers

Greg Locock


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