球阀动水关闭过程中球阀与机组稳定性分析

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Abstract Based on measured data from one pumped storage power station,stability parameters of pumped storage unit and ball valve have been analyzed by short time Fourier transform.Frequency changes of the ball valve and unit during ball valve closing in dynamic water conditions have been summarized.The research shows that the unit and ball valve vibrations involve a 100 Hz component in stable running condition.And the 100 Hz component mainly results from two-fold blade passing frequency not from generator polar frequency; the two-fold blade passing frequency component propagates upward and aggravates the vibrations of unit and ball valve.

Key words： short time Fourier transform stability parameter polar frequency blade passing frequency ball valve dynamic water closing

Received: 08 December 2015 Published: 15 April 2017

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	Articles by authors
	ZHANG Fei1
	TANG Yongjun1
	WANG Guozhu2
	DENG Lei1

Cite this article:

ZHANG Fei1,TANG Yongjun1,WANG Guozhu2, et al. Stability analysis of ball valves and units in ball valve dynamic water closing process[J]. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(8): 244-252.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2017/V36/I8/244

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