Study on nonlinear dynamics of rotor system with slowly-varying mass basedon time-frequency analysis

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Journal of Vibration and Shock ›› 2014, Vol. 33 ›› Issue (20) : 105-110.

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Study on nonlinear dynamics of rotor system with slowly-varying mass basedon time-frequency analysis

YU Tao1,2,3，WANG Jiao1,2，LI Ying-jie1,2，SUN Wei 3，HAN Qing-kai 3

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Abstract

The dynamic model of simplified-concentrated-mass based Jeffcott rotor system with slowly-varying mass is build. Analytic processing for rotor system with slowly-varying mass is introduced by adopting the asymptotic method. And the analytic solutions for response of the rotor system are deducted detailedly. With the analytic solutions and Reassigned Morlet scalograms, the nonlinear dynamics of rotor system with slowly-varying mass are discussed. The specific nonlinear dynamic characteristics for rotor system with slowly varying mass can be referred for research on slowly-varying parameter system and diagnosis of corresponding faults.

Key words

rotor system / slowly-varying mass / asymptotic method / nonlinear dynamics / time-frequency analysis

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YU Tao;;WANG Jiao;LI Ying-jie;SUN Wei;HAN Qing-kai . Study on nonlinear dynamics of rotor system with slowly-varying mass basedon time-frequency analysis [J]. Journal of Vibration and Shock, 2014, 33(20): 105-110