There are many like flexible coupling, jaw coupling, sleeve coupling, tire coupling, pin and bush coupling, rigid coupling, etc
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You will have two coupling constants, Ja and Jb.
Ja is the frequency difference between the CENTERS of
the TWO DOUBLETS. Jb is the frequency difference between the
TWO PEAKS in a SINGLE DOUBLET.
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A Thompson Coupling is a High RPM, High angle, constant velocity
joint between to turning shafts. The TC is used in a wide range of
applications from the automotive industry, trains and on the rotor
shaft of helicopters.