基于HB-AFT方法的水电机组转子-轴承系统振动特性研究

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Abstract Under the combined action of electromagnetic and mechanical excitations, the strong nonlinear characteristics are presented in differential equation of rotor-bearing system for hydraulic generating set. The periodic solution of system is solved by means of semi-analytical and semi-numerical harmonic balance method with alternating frequency/time domain technique, which is compared with conclusion obtained by numerical method. The results show that the dynamic characteristics of system exist remarkable distinction with and without unbalanced magnetic pull. From the analytical level, the method of harmonic balance method with alternating frequency/time domain technique can accurately reveal the periodic motion of rotor. For the unsteady quasi-periodic motion, the method cannot completely present the dynamic response of system, however, the analytical results acquired through the way can be used to judge the motion trend of rotor as well as the composition of vibration composition, so as to provide a useful reference for early fault diagnosis and identification of shaft system for hydraulic generating set.
Key words: hydraulic generating set; rotor-bearing system; periodic solution; unbalanced magnetic pull; harmonic balance method with alternating frequency/time domain technique

Key words： hydraulic generating set rotor-bearing system periodic solution unbalanced magnetic pull harmonic balance method with alternating frequency/time domain technique

Received: 19 April 2021 Published: 28 August 2022

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	Articles by authors
	ZHANG Leike1
	YUAN Qian1
	WANG Xueni1
	MA Zhenyue2
	TANG Hualin1
	ZHANG Jinjian1

Cite this article:

ZHANG Leike1,YUAN Qian1,WANG Xueni1, et al. A study on vibration characteristic of a rotor-bearing system for hydraulic generating set based on the HB-AFT method[J]. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(16): 26-32.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2022/V41/I16/26

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