Nonlinear vibration responses of a rubbing rotor considering the non-probabilistic uncertainty of parameters

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (18) : 56-62.

MA Xinxing1,2，ZHANG Zhenguo1,2，HUA Hongxing1,2

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Abstract

The rotor/stator rubbing fault has a serious impact on the safety and reliability of a gas turbine, and the uncertainty of the nonlinear rubbing response is an important constraint for its evaluation, prevention, and control.Therefore, considering the uncertain effects of the rotor/stator clearance, rotor unbalance and contact stiffness, the uncertain dynamic model of a gas turbine dual-disk single-axis rotor with fixed-point rubbing faults was established to study the rubbing induced vibration response characteristics and its influential parameters.For the non-smooth/uncertainty rubbing dynamic equations, the combination of the harmonic balance method and the alternating frequency-time scheme (HB-AFT) was adopted to obtain the periodic solution of the rotor system, and the non-intrusive Chebyshev interval method was used to estimate the upper/lower bounds of the nonlinear vibration response.The influence of each interval variable on the response uncertainty could be quickly quantified.Finally, the effectiveness and computational advantages of the proposed method were verified by comparing with the traditional Monte Carlo simulation.The numerical results show that the uncertainty of the parameter interval has a significant effect on the global amplitude-frequency responses of the rubbing rotor, which can lead to differences in the occurrence conditions and severity of rotor/stator rubbing fault.The research results provide a guidance for more accurate diagnosis and prevention of gas turbine rotor rubbing faults.

Key words

rotor system / rubbing / interval method / uncertainty / harmonic balance method

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MA Xinxing，ZHANG Zhenguo，HUA Hongxing. Nonlinear vibration responses of a rubbing rotor considering the non-probabilistic uncertainty of parameters[J]. Journal of Vibration and Shock, 2021, 40(18): 56-62

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