Investigation of structural parameters of high speed grinder spindle system on dynamic performance

This study was focused on the theoretical modelling and numerical simulation about the dynamic characteristics of coupled double-rotor spindle system of high speed grinder. The influences of the grinder spindle’s major structural parameters on its critical speed and vibration mode were investigated. The results showed that the critical speeds of coupled double-rotor system were arranged in a similar increasing order as to those of each single rotor. It was thus indicated that the critical speeds of each order for coupled double-rotor system corresponded to those of single rotor. Furthermore, the effect of preload of bearing, overhang length, span of bearing, rotor structure and mass of spindle system on critical speeds of various orders for the coupled spindle system was analysed. Under the impact of unbalance, vibration response of the spindle’s front end as well as the front and back bearings was examined. Finally, the changing effect of preload of bearing, overhang length and bearing span on dynamic and static rigidities of spindle ends was investigated.