科研之友
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摘要
As core part of rotor system, the disc shaft is liable to the interference fit failure of shaft-hub under complex working conditions and alternating loads. In order to study the influence of interference magnitude and rotating speed on the contact stress of shaft-hub, and the influence of rotating speed on the vibration characteristics of rotor system, a finite element model of rotor contact between hub and shaft was proposed according to Hertz contact mechanics model, simulation analysis and experiment verification were conducted. The simulation and experiment results show that the interference failure will cause the micro-friction between hub and shaft and the obvious difference of rotating speed. When the rotating speed is lower, the beat vibration characteristics appear in the time-domain figure, and the rub-impact occurs between shaft and hub. When the rotating speed increases, the beat vibration cycle changes significantly. And the track of disc center changes from irregularly serrated shape to regular circle. In addition, the increase of rotating speed will cause the decrease of contact stress between shaft and hub, and the amplitude in time-frequency figure increases obviously.
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