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This touchless gear system uses fluid dynamics to transfer power and rotation without any teeth

For five millennia, human civilization has progressed on the back of a simple yet rigid idea: the gear. From the chariot ...
IEEE

Non-Contact Ultralow Rotational Speed Measurement of Real Objects Based on Rotational Doppler Velocimetry

Abstract: Rotational speed measurement has increasingly become an important requirement both in the industrial and aerospace fields. This article presents a technique for rotational speed measurement ...