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Automotive Applying torque to a tube

  1. Sep 6, 2016 #1
    Hi Guys,
    I have a simple annulus of radius 25mm and 15mm of length 50mm where i applieD a torque of T=100000Nmm. Its inertia about its main axis is I=124.9 kgmm2.
    Therefore i expect the acceleration to be T/I.
    Its not clear how to confirm this answer in Msc Adams because when i set simulation time of 0.1 or 1 sec I always get increasing velocity/acceleration.
    What am I missing?

    Regards
    B
     
  2. jcsd
  3. Sep 6, 2016 #2

    Nidum

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    If you apply a fixed value torque to an object with a fixed value polar moment of inertia then it will just keep on accelerating forever ?
     
  4. Sep 6, 2016 #3
    Then under what conditions does this Torque =inertia times alpha hold that one typically sees in textbooks?
     
  5. Sep 6, 2016 #4

    Nidum

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    Nothing wrong with the expression .

    What is angular velocity of object after time t ? Assume zero initial velocity .
     
  6. Sep 10, 2016 #5

    CWatters

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    +1

    In practice things like friction, air resistance, strength of materials limit the angular velocity but if you don't model those then the angular velocity is unlimited.
     
  7. Sep 10, 2016 #6

    CWatters

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    Does the acceleration you get in Msc Adams agree with the calculated value?
     
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