Multiple frictional dynamic absorber for rotors and its vibration attenuation characteristics
A compact vibration absorber with multiple frictional dynamic absorber was presented to dissipate the excessive vibration of rotor passing through the critical speed.The ring-like absorber integrated multiple cantilevered oscillators and the frictional damping suitable for high temperature and complex environment.In order to gain effective models for the design and performance analysis,the finite element method,combined with the Lagrange equation approach,was employed for modeling of the vibration absorber-rotor system.The harmonic balance method was applied to effectively solve the governing equation of the system.On this basis,the effects of the mass ratio,frequency ratio,the number of oscillators and the normal force on the friction surfaces on the vibration mitigation performance of the absorber were investigated.The sensitivity of its effectiveness to the random deviation of some parameters was also addressed.Numerical results showed that the presented absorber can obviously reduce the maximum response amplitude of the rotor,with the maximum relative ratio reaching above 70％.Besides,the performance of the absorber was very robust.
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