How to calculate inertia from deceleration time

  1. I have a dynamometer to determine HP and Tq of cars and im trying to setup my software and i need the inertia of my rollers to determine Tq but i have a big flywheel that will turn 1,580 revolution per each roller revolution so its very difficult to determine inertia by calculating the mass of the rollers + mass of the flywheel + gearing multiplier etc...

    Someone told me that i should be able to determine inertia by turning my roller to 2000rpm and calculate the time it decelerate from 1500rpm - 500rpm

    Do anybody can give me this formula or the right way to determine inertia by doing that

    Thanks
    Fred
     
  2. jcsd
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