Abstract
The problem of decelerating a rotor from a high speed through its critical speeds has received very little attention in technical literature although transient processes occurring during coastdown of machinery usually provide a lot of information about their tribodynamics. The problem of deceleration is critically examined and the governing equations for a mechanical system are derived using Lagrangian dynamics. The governing non-linear equations have been solved under quasi-static conditions. The results confirm the relationship between dynamic unbalance, damping and the deceleration during coastdown.
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