Experimental and Finite Element Analysis to Investigate the Vibration of Oblique-Stud Stator Frame in a Large Hydropower Generator Unit

Jianzhong Zhou, Xuanlin Peng, Ruhai Li, Yanhe Xu, Han Liu and Diyi Chen
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Jianzhong Zhou: School of Hydropower and Information Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Xuanlin Peng: School of Hydropower and Information Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Ruhai Li: School of Hydropower and Information Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Yanhe Xu: School of Hydropower and Information Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Han Liu: School of Hydropower and Information Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Diyi Chen: Institute of Water Resources and Hydropower Research, Northwest A & F University, Yangling 712100, China

Energies, 2017, vol. 10, issue 12, 1-18

Abstract: This paper presents an investigation on the undesirable vibration of an oblique-stud stator frame in a large hydropower generator by means of experimental and finite element (FE) analysis. First, field experimental tests were performed, and the results indicate that the main vibration component comes from electromagnetic factors. Then, a 2D-magnetic and 3D-mechanical FE model was developed to investigate the vibration of the stator frame under the action of electromagnetic forces. A set of contrast models was established to study the effects of different kinds of eccentricity and different structures. Based on the comparative analysis between the results of simulations and experimental tests, it can be inferred that the abnormal vibration is generated because of the lack of stiffness in the upper part of structure and the existence of dynamic eccentricity in the rotor–stator system. In addition, the structural simulation analysis shows that the flexible designed oblique-stud stator frame is relatively vulnerable against the electromagnetic forces.

Keywords: experimental vibration test; 2D-magnetic and 3D-mechanical coupled finite element (FE) model; oblique-stud stator frame; eccentricity (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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