Abstract
In many rotating systems shaft couplings of low torsional stiffness may bring dangerous one node critical speeds below the operating speed range. However, even soft couplings on multi-mass systems may allow higher node criticals to remain in the operating range. If two sections of a system be coupled by a coupling of zero stiffness torsional impulses cannot be transmitted from one section to the other, thus eliminating criticals.
Coupling stiffness must be related to the torque transmitted, and experiments indicate that a stiffness/torque ratio below about 4 is almost as effective as zero stiffness.
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