关键词: 转子；动力学；刚度；突变；参数区域；碰摩

Abstract:

Dynamical model and equation of Jeffcott rotor system with sudden change stiffness were established based on rotor dynamics. Vibration expression of rotor system with sudden change stiffness was obtained through analytical method. Relationship between the steady-state amplitudes fore and after stiffness suddenly changed was analyzed, and the influence of sudden change stiffness on maximal axis displacement was also studied. Transient time after stiffness suddenly changed was defined and rubbing parameter region was determined. The conclusion indicates that sudden change stiffness can cause the magnification of rotor amplitude; maximal axis displacement generated by sudden change stiffness always appears during transient motion stage no matter operating frequency is what; transient time is related with system damp and axis azimuth when stiffness suddenly changed and operating frequency; rubbing parameters region will increase with stiffness sudden change amplitude and mass eccentricity enhancing.

Key words: rotor dynamics, stiffness, sudden change, parameter region, rubbing