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Home > Forums > Aerospace Engineers > Activities > Aerospace engineering other topics Forum

about TORQUE(2)

Read More Threads Like This One

heavenly (Aerospace)

10 Jan 05 5:33

hi,
torque= ang.accleration X moment of innertia
  (Nm )       =deg/sec.sq   X  Nm2

  but from above conversion,how to reach to get Nm
& also if we convert deg/sec.sq into rad/sec.sq,
value will be reduced by 57 times

   MY QUESTION HOW TO GET .....Nm

thanx in before
John

(2) FredGarvin (Mechanical)

10 Jan 05 8:13

Your units are not correct.

The units for polar moment of inertia are: kg*m^2

The units for angular accel. are: rad/sec^2

radians are not a true engineering unit so they do not enter into cancelling out. That leaves you with:

(kg*m^2)/sec^2 = N*m

heavenly (Aerospace)

10 Jan 05 23:21

Hi Fredgravin

HEARTLY THANKFUL TO YOU FOR GIVING THIS VALUABLE
INFORMATION

with warm regards

John

edbgtr (Aerospace)

11 Jan 05 2:37

FredGarvin

The radian is an engineering unit. Degrees are not.

The radian measure of an angle is defined as the arclength divided by the radius of the arc. It is thus dimensionless, and hence disappears when dimensional analysis is performed to determine the resulting units of a formula.

Take care.

Ed.

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