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Calculate the power

  1. Jul 3, 2012 #1
    1. The problem statement, all variables and given/known data

    Calculate the power that can be safely transferred by a 100 mm shaft rotating at 150 revolutions per minute.



    2. Relevant equations

    Radius = diameter/2=100/2=50 mm
    Shaft from mild structural steel
    K=6
    T= 320 N/mm2


    3. The attempt at a solution


    J=(3.14/2)*r4
    J=(3.14/2)*504= 1.57*6250000=9812500
    T=TJ/KY=320*9812500/6*50=3140000000/300=10466666.67 Nmm
    Changed to Nm= 10.466 Nm
    Per minute 150
    Per second = 150/60 = 2.5per second
    Angular velocity= 2.5 *(2*3.14)= 2.5*6.28=15.7 rad/sec
    Power=15.7*10.466=164.3162 Nm/sec= 164.3162 watts
    Power changed to horsepower= 220.35162 (hp) ????????????


    Please check my result:D
     
  2. jcsd
  3. Jul 4, 2012 #2
    can anyone help?
     
  4. Jul 4, 2012 #3
    I guess if the shaft is made of bamboo, less power transferred than if it is made of steel.
     
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