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Energies 2017, 10(12), 2175; doi:10.3390/en10122175

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

1,2,* , 1,2,* , 1,2
,
1,2
,
1,2
and
3
1
School of Hydropower and Information Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
2
Hubei Key Laboratory of Digital Valley Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
3
Institute of Water Resources and Hydropower Research, Northwest A & F University, Yangling 712100, China
*
Authors to whom correspondence should be addressed.
Received: 2 November 2017 / Revised: 8 December 2017 / Accepted: 12 December 2017 / Published: 19 December 2017
View Full-Text   |   Download PDF [8155 KB, uploaded 19 December 2017]   |  

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. View Full-Text
Keywords: experimental vibration test; 2D-magnetic and 3D-mechanical coupled finite element (FE) model; oblique-stud stator frame; eccentricity experimental vibration test; 2D-magnetic and 3D-mechanical coupled finite element (FE) model; oblique-stud stator frame; eccentricity
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MDPI and ACS Style

Zhou, J.; Peng, X.; Li, R.; Xu, Y.; Liu, H.; Chen, D. Experimental and Finite Element Analysis to Investigate the Vibration of Oblique-Stud Stator Frame in a Large Hydropower Generator Unit. Energies 2017, 10, 2175.

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