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Torsional Problem with gears

  1. May 8, 2016 #1
    upload_2016-5-8_16-20-42.png
    Hi, this is a question from a previous past paper that I am having trouble with. Am I meant to just use the number of teeth from each gear to find a ratio and use this to find the effective inertia at point C. Then use this to find a torque and take away the torque of the constant load.
    My exam is tomorrow so any help would be greatly appreciated.

    Here is my working
    https://scontent-lhr3-1.xx.fbcdn.net/v/t34.0-12/13162482_10156888512910486_1882077086_n.jpg?oh=08e752c6546ce7cb6b8917d83a1d6d77&oe=57313006

    Thanks
     
    Last edited: May 8, 2016
  2. jcsd
  3. May 10, 2016 #2

    haruspex

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    Your notation is confusing... Ib=Ib+Ia(r^2)?!
    More importantly, you are thinking about the ratios wrongly. As gear B turns once, how often does gear A turn?
     
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