Torsional pendulum determines mass moment of inertia - Theory of Machines - 1

Q.  Torsional pendulum is used to determine mass moment of inertia of
- Published on 06 Aug 15

a. flywheel
b. rigid bar
c. both a. and b.
d. none of the above

ANSWER: flywheel

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    Discussion

  • Sravanthi   -Posted on 19 Oct 15
    Torsional pendulum or Trifilar suspension system is used determine mass moment of inertia of a flywheel or disc.

    In this method, the flywheel is suspended by three strings and is rotated by an angle θ. After releasing the disc or flywheel it oscillate with simple harmonic motion.

    Frequency of oscillation = [ (x / 2 k π) √g / l ] cycles / sec

    Periodic time of oscillation = 1 / fn sec / cycles

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