Modal Plate Benchmark
Modal Plate Benchmark
(OP)
Our vib lab just purchased some modal software. I have lost the a resulsts of a modal analysis done on a plate published by the IES as a benchmark (probably ~15 years old). I was wondering if there was a relatively simple and cost effective benchmark we could use to verify and train people?





RE: Modal Plate Benchmark
On the other hand why not use a simplified structure typical of your normal test items? For extra marks get them to build an FE model of it and see if they can get good correlation. Very evil grin. Once they've been through that exercise they will be amongst the best dynamic analysts around!
What sort of business are you in?
Cheers
Greg Locock
RE: Modal Plate Benchmark
I would suggest that a flat plate with close modes is a good way of testing your modal analysis software. The way to achieve close modes on a freely suspended rectangular plate is to make the dimensions in the golden ratio
(sqrt(5)+1)/2 = 1.618033989...
The first twisting and first bending modes should be on top of each other. Try it with an aluminium and acrylic plates (say ~800*500*10 mm) to get different orders of magnitude of damping.
Its a good training piece as well. Most people find it easy to visualise modes on a free flat plate. You can easily see of you have the "right" answer.
Cost approx euro/$ 200 for the materials. No difficult manufacturing involved.
M
M
RE: Modal Plate Benchmark