Journal article
Transient Resonance Oscillations of a Mechanical System with Regard to Non-Linear Damping Effects
Publication Details
Authors: | Irretier, H.; Balaschov, D. |
Publication year: | 2000 |
Journal: | ASME Publication DET C99/VIB- |
Pages range : | 287 - 288 |
Volume number: | 80 |
Abstract
Transient, forced vibrations of a turbine blade are modelled. Dissipative effects such as material damping, aerodynamic damping and damping at interfaces are taken into account. For the modelling of these effects the set of isolated weakly non-linear single degree of freedom oscillators with slowly varying natural frequencies and small non-linear damping is used. The non-linear damping law considers as a sum of elementary pourer functions with respect to the modal velocity. The Krylov-Bogoljubov asymptotic method is applied for the investigation of the transient resonance response which is induced by the sweep of the excitation frequency through the system natural frequency during run-up or run-down. Numerical calculations are provided to demonstrate the validity of the first asymptotic approximation.
Transient, forced vibrations of a turbine blade are modelled. Dissipative effects such as material damping, aerodynamic damping and damping at interfaces are taken into account. For the modelling of these effects the set of isolated weakly non-linear single degree of freedom oscillators with slowly varying natural frequencies and small non-linear damping is used. The non-linear damping law considers as a sum of elementary pourer functions with respect to the modal velocity. The Krylov-Bogoljubov asymptotic method is applied for the investigation of the transient resonance response which is induced by the sweep of the excitation frequency through the system natural frequency during run-up or run-down. Numerical calculations are provided to demonstrate the validity of the first asymptotic approximation.
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