Abstract
The dynamical behaviour of a rotor running into contact with a non-annular stator is studied by numerical simulations. The rotor is represented by a 2-dof model moving in one plane. The stator models an arbitrary number of discrete stops by superimposing annular stators with large clearances and high offsets. Friction forces are included in the contact description. The strongly nonlinear differential equations are integrated using a fourth-order Runge-Kutta procedure. Time histories for start-up and run-down sequences are simulated in two numerical examples. Different stop configurations have been evaluated. For a configuration with four symmetrically distributed stops an interesting bouncing phenomenon was discovered. This was not found for a non-symmetrical configuration. When the bouncing phenomenon occurred, the radial displacement of the rotor was larger for the stators with stops than for an annular stator.
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