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Torque is measured by either sensing the actual shaft deflection caused by a twisting force, or by detecting the effects of this deflection. To measure torque, strain gage elements usually are mounted in pairs on the shaft.
The surface of a shaft under torque will experience compression and tension, as shown in the Figure.
Torsional vibration
Solid mechanics defines torsion as the twisting of an object as a result of applied torque. Torsional vibration can be broadly described as the angular vibration of any object. It can be defined specifically as the periodic motion corresponding to a shaft, where the shaft is twisted about its axis, alternating from one direction to the other.

Where does Torsional Vibration Occur?

Torsional vibration is commonly a concern in large power transmission systems that incorporate shafts or couplings. In such environments, uncontrolled torsional vibration can cause transmission failure.

Torsional vibration measurements

Torsional vibration is an oscillation of angular position about a centerline, and is caused by oscillating torque forces.

Torsional vibration can cause failures in all types of machinery. Potential problems include cracked shafts, coupling damages and excessive gear wear are only examples.

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