Analysis on Factors Influencing Vibration Response of Axle Box Bearings for EMU Under Outer Ring Fault Condition
Aimed at the problem of dynamic response of axle box bearings under fault,the rigid-flexible coupling finite element model of double row tapered roller bearings with outer raceway spalling fault is constructed by setting rollers as rigid bodies and other components as flexible bodies.The influence of fault size,fault location and load change on dynamic response of the bearings is studied.The results show that the rigid-flexible coupling model not only improves the problem of large vibration response of full rigid bodies,but also avoids the disadvantage of long calculation time for full flexible bodies;the larger the fault size of the bearings,the closer the fault location is to loaded area,the larger the load of the bearings,the more obvious the fault characteristics shown by vibration signal,when the fault size reaches a certain level,the fault characteristics will change from single impact to double impact;the influence of radial load on fault response of the bearings is much greater than that of axial load.
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