水力发电机组轴系不确定性量化及参数敏感性分析

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Abstract Researches of the shaft system for hydroelectrical generating unit is mainly based on the deterministic framework. However, in the actual engineering, influences of uncertain factors on shaft system of that cannot be ignored. In view of this, this paper will be presented to devote to the uncertainty quantification and global sensitivity analysis of inherent characteristic and dynamic response of the shaft system for hydroelectrical generating unit under uncertainty framework. Firstly, a dynamical model of the shaft system for hydroelectrical generating unit is established including uncertain parameters. Then, relationships between uncertain structural parameters and output variables are described by the generalized polynomial chaos approach. And combining the maximum entropy principle, the concrete probability distribution expressions of random outputs are attained. In addition, indexes describing contributions of uncertain input parameters on the uncertainty of natural frequency and vibration response are gotten by a simple post-processing for expansion coefficients. At the same time, the reliability of uncertainty quantification and sensitivity analysis in this paper is also verified by Monte-Carlo simulation. Most importantly, the uncertainty quantification and parameter sensitivity analysis of the hydraulic generating unit under the uncertainty framework proposed in this paper are meaningful for the design, optimization and operation of that.

Key words： hydroelectric generating unit shaft uncertainty parameter sensitivity analysis polynomial chaos

Received: 25 January 2021 Published: 15 May 2022

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	Articles by authors
	YAN Donglin
	ZHENG Yang
	LIU Wanying
	CHEN Qijuan

Cite this article:

YAN Donglin,ZHENG Yang,LIU Wanying, et al. Uncertainty quantification and parametric sensitivity analysis of hydroelectric generating unit shafting[J]. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(9): 18-25.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2022/V41/I9/18

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