engleski

Adaptive time-step implicit methods for solving contact problems in rotordynamics

In the paper the determination of transient nonlinear multidisc rotor response, whirling with slip on the vibrating stator, is shown. Nonlinearities are taken in the mathematical model through the normal contact force, as a function of deformation, deformation velocity as well as contact angle, in the contact point. Some results in using HHT alpha, WBZ alpha and generalized alpha method, for numerical obtaining of response of run-down rotor during the contact with vibrating stator in the dry friction bearings, are given. The numerical stability and accuracy of these methods are compared. Special attention is paid to the possibility of using the adaptive time step calculation. For this purpose dif-ferent numerical indicators, which detect the ranges where the time-steps have to be reduced or where they may be enlarged, are compared. Also the criteria for the recalculation with the smaller and larger step size are given.

rotordynamics; contact problem; adaptive time step methods

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