Polar Moment of Inertia in Torsional Vibrations Formulas

Polar Moment of Inertia is a measure of an object’s resistance to torsional deformation, which is a twisting force that causes rotation around a longitudinal axis. And is denoted by J. Polar Moment of Inertia is usually measured using the Meter⁴ for Second Moment of Area. Note that the value of Polar Moment of Inertia is always negative.

Torsional Vibrations formulas that make use of Polar Moment of Inertia

fxNatural Frequency of Free Torsional Vibration for Rotor B of Two Rotor SystemGo

fxNatural Frequency of Free Torsional Vibration for Rotor A of Two Rotor SystemGo

FAQ

What is the Polar Moment of Inertia?

Polar Moment of Inertia is a measure of an object’s resistance to torsional deformation, which is a twisting force that causes rotation around a longitudinal axis. Polar Moment of Inertia is usually measured using the Meter⁴ for Second Moment of Area. Note that the value of Polar Moment of Inertia is always negative.

Can the Polar Moment of Inertia be negative?

Yes, the Polar Moment of Inertia, measured in Second Moment of Area can be negative.

What unit is used to measure Polar Moment of Inertia?

Polar Moment of Inertia is usually measured using the Meter⁴[m⁴] for Second Moment of Area. Centimeter⁴[m⁴], Millimeter⁴[m⁴] are the few other units in which Polar Moment of Inertia can be measured.

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