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A dynamic-response-evaluation method for torque transducers is proposed. In this method, dynamic torque is applied to the transducer being tested by using a rotating flywheel, via a frictional clutch. To realize the condition under which the angular impulse acting on the transducer is sufficiently equivalent to the change in angular momentum of the flywheel, the flywheel is supported by a pneumatic bearing with sufficiently small friction. The angular velocity of the flywheel is measured by means of a rotary-encoder system. The relative uncertainty in the measurement of the angular momentum acting on the transducer is estimated to be less than 10-3.

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A torque transfer device is used for international comparison between torque standard machines or for comparison verification between a torque standard machine and torque calibration machine. This experimental study revealed a problem in the case of using a high-precision torque transducer as the transfer device. For a disk-type torque transducer, it was found that a considerable deviation in the torque output sensitivity occurred depending on the dimensions of the adapter flange and the fastening torque of the screw bolts directly connecting the torque transducer to the adapter flanges. A solution is proposed to overcome this difficulty.