Hi Gowtham,

This is a very interesting question. I am afraid I am not aware of any standard describing what you are after. The only thing I can tell you is that in my case, working with electrodynamic shaker before (in two different setups) I had to be sure that the resonance of the fixture was out of the in-scope frequency range. The only way I could do it was to use as much mass as possible, designing a quite heavy fixture compared with the examined specimen (fixture's mass/specimen's mass>50). Additionally, the shaker was mounted on the fixture, so it was designed to be very stiff on the mounting point.

I don't know if I am helping you somehow...

All the best,

Theofanis Ampatzidis.

Hi

I am not aware of any such standard.

Common understanding of SDOF systems suggests that

• fixture ´+ highest load should have its 1st resonance frequency at 3x the highest frequency of interest to limit resonant amplification to 1 dB (12%).
• A stricter criterion if a force cell is located between object and fixture is that a 5 degree phase error is accepted, i.e. that the 1st resonance frequency at 10x the highest frequency of interest.

In addition, one would want the fixture stresses at the above selected criterion to lie at a suitably low mechanical stress range, such that the fixture would be fatigue rated. Stress range is then selected for a suitable material and from a suitable standard or recommended prcedure, e.g. DNC RP C203. https://rules.dnvgl.com/docs/pdf/DNVGL/RP/2016-04/DNVGL-RP-C203.pdf

Just my 2 cents

Claes