Shaker manufacturers rate their random capabilities based on Gaussian (kurtosis = 3) random. The real world, however, is not always Gaussian. Test engineers are able to increase kurtosis values with Vibration Research’s random Kurtosion® software to better account for peaks in real world conditions. Increasing the kurtosis value on a shaker for specific tests may decrease the random lb-f rating provided by the manufacturer.
There is a relation between kurtosis and crest factor which can be used to determine shaker capacity for a random Kurtosion® test. Crest factor can be determined based on the desired kurtosis value of a test, and shaker (de-)rating can be determined based on crest factor.
This calculator will help you answer:
- What is the maximum kurtosis capacity of my existing shaker system for my test(s)? How much must I de-rate my shaker for a higher kurtosis value in my test(s)?
- What size (lb-f) shaker is required to run a specific random Kurtosion® test?
Capacity Calculator (Excel)