Abstract
Full ceramic bearings have excellent characteristics such as high temperature resistance and high speed, which can meet the requirements of aerospace engines and other precision machinery in a wide temperature range. Nonetheless, a challenge arises due to the disparate thermal expansion coefficients between full-ceramic bearings and steel housings. This incongruence results in a gradual loss of control over the seat hole by the outer ring as temperatures elevate. The loosening of ceramic bearings is a crucial factor causing misalignment of rotary centers, exacerbating rotor system vibration with rising temperature. In this study, a full-ceramic bearing-rotor system’s dynamic model under thermally induced loosening is presented. The dynamics characteristics of the shaft end output - time domain, frequency domain, and axis trajectory are analyzed. The proposed model undergoes validation through the application of the mean square loss function, the value remains below 2. Through a comprehensive analysis, both theoretically and experimentally, it has been established that frequencies 2fr, 3fr, and 8fr serve as suitable references for discerning thermally induced loosening faults within full-ceramic bearing rotor systems. Recommendations include opting for a tighter fit or increasing heat-conducting rings in aero-engines, underscoring the importance of meticulous engineering in aerospace design and performance enhancement.
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