Abstract
In turbomachinery applications, thin-walled gears are cyclic symmetric structures and often subject to dynamic meshing loading which may result in high cycle fatigue (HCF) of the thin-walled gear. To avoid HCF failure, ring dampers are designed for gears to increase damping and reduce resonance amplitude. Ring dampers are installed in the groove. They are held in contact with the groove by normal pressure generated by interference or centrifugal force. Vibration energy is attenuated (converted to heat) by frictional force on the contact interface when the relative motion between ring dampers and gears takes place. In this article, a numerical method for the prediction of friction damping in thin-walled gears with ring dampers is proposed. The nonlinear damping due to the friction is expressed as equivalent mechanical damping in the form of vibration stress dependence. This method avoids the forced response analysis of nonlinear structures, thereby significantly reducing the time required for calculation. The validity of this numerical method is examined by a comparison with literature data. The method is applied to a thin-walled gear with a ring damper and the effect of design parameters on friction damping is studied. It is shown that the rotating speed, geometric size of ring dampers and friction coefficient significantly influence the damping performance.
Highlights
Vibrations of gears are mainly caused by dynamic meshing loads
The results revealed that increasing the mass of the ring damper is beneficial to of the key parameters of ring dampers on the vibration vibration reduction
[15].byZucca analyzed the axial andfor circumferential relative wheels, vibration energy is attenuated by the axial component of the vibration, and friction damping motion ofisa produced bevel gear with a ring damper in different response conditions
Summary
Vibrations of gears are mainly caused by dynamic meshing loads. Resonance of the gear may occur if the excitation frequency is close to the resonance frequencies of the gear within its range of operating speeds. Example train relative motion in the axial direction [15].byZucca analyzed the axial andfor circumferential relative wheels, vibration energy is attenuated by the axial component of the vibration, and friction damping motion ofisa produced bevel gear with a ring damper in different response conditions. No in the radial direction due to the ring damper maintaining contact with the primary structure by relative motion occurs in the radial direction due to the ring damper maintaining contact with the centrifugal force.structure by centrifugal force All of these papers show that vibration amplitude will decrease when ring dampers are used, limited work to investigate the nonlinear friction damping of thin-walled gears with ring dampers has been done.
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