Fractional-order modeling and dynamic analyses of a bending-torsional coupling generator rotor shaft system with multiple faults

• Published in: Chaos, solitons and fractals Vol. 110; pp. 1 - 15
• Main Authors: Yan, Donglin, Wang, Weiyu, Chen, Qijuan
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.05.2018
• Subjects: Bending-torsional coupling; Chaos; Crack fault; Fractional-order; Nonlinear dynamic; Chaos; Fractional-order; Nonlinear dynamic; Crack fault; Bending-torsional coupling
• ISSN: 0960-0779; 1873-2887
• DOI: 10.1016/j.chaos.2018.03.015

•The fractional derivative was introduced into the modeling of generator.•The coupled bending-torsional vibration was considered in the model.•The stability of generator with the changes of system parameters was discussed.•Some critical values and ranges of system were proposed. Unexpected vibrations induced by the crack fault and other unbalance factors in rotor system seriously affect the health and reliability of the generator. Here, to explore the vibration performances, a bending-torsional coupling model of the generator rotor shaft system is established, in which electromagnetic malfunction (unbalanced magnetic pull) and mechanical failures (fractional-order damping, crack and contact-rubbing) are considered. Then, the simulation is done by a modified Adams-Bashforth-Moulton algorithm. Based on the simulation, the correctness of the new coupling model is verified by comparing with previous model and experimental data. At the same time, the new coupling model is analyzed to obtain the dynamic evolutions of the generator rotor shaft system with the changes of crack depth ratio, the fractional order of damping, rotational speed ratio and mass eccentricity of rotor. In addition to this, some critical values and ranges are proposed. Finally, these results can efficiently provide a theoretical reference for the design of generator rotor system and be applied to forecasting and diagnosing vibration faults in generator rotor shaft system.