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  1. vibefreq

    Vibration Test Tolerances

    Thank you all. I'm going to experiment with the 1 g sweep, which seems to be the industry standard, and then start the process of changing the requirements. It has been rumored that it is a customer requirement, so it is going to be uphill task.
  2. vibefreq

    Vibration Test Tolerances

    ETSSolution Slip-Tables claim they are good to 2000hz but read the quote from the brochure "Cross-axis motion is constrained and is typically less than 10% of input at frequencies up to 2000 Hz. except at resonance." And that's the crutch, they all work good, "except at resonance", which beyond...
  3. vibefreq

    Vibration Test Tolerances

    Yes IRstuff you are right; however, to test parts of the size and weight we have our table is large enough to have resonances below our max test frequency. In some cases we test to 2000hz on a 48 inch slip-plate. This particular slip-plate is 24" If someone has a design for a 48 inch slip-plate...
  4. vibefreq

    Vibration Test Tolerances

    We have been given a requirement for a 0.5g sine sweep 5-2000hz with a tolerance of +-10%. So far we have not been able to maintain the +-10% at the shaker table resonant frequency (about 1300hz). Has anyone ever found a solution to holding +-10% at the shaker table resonance? The controller...
  5. vibefreq

    Variation of amplification factor - Vibration shaker testing

    Many systems are not linear as amplitude increases. As amplitude increases there will be some reduction in response frequency. usually, once back to a low er amplitude the response frequency will return to it's previous higher frequency. While frequency shift is not your problem in this case...

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