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Proceedings Paper

Experimental analysis of dynamic characteristics for vibration-impact process of steam turbine blades with integral shroud
Author(s): Yan Wang; Lu-ping Li; Xu-xiang Lu; Hong-de Rao; Yu-jing Liu
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Paper Abstract

Integral shroud is an advanced technique used to improve reliability of steam turbine blades. In this paper, dynamic characteristics of vibration-impact process of steam turbine blades with integral shroud are studied. To test and verify the reliability of calculation result, a series of experiments are well performed on the platform of contracting and impacting of blades tips. The dynamic strain data under different gaps, different loads and different rotating speeds are surveyed through which the log decrement at each condition is obtained, and the effects of vibration damping are obtained by comparing the log decrement. The results of experimental study show that larger log decrement means larger system damping and better effectives of vibration reduction. Besides, the effects of vibro-impact reduction of different parameters are got and the experimental study results show that the vibro-impact structure is a good vibration damper. The dynamic stress of the blade with integral shroud is insensitive to loads when the gap between adjacent integral shrouds is small. In short, the achievements gained in the paper have revealed dynamic characteristics for vibro-impact process of steam turbine blades with integral shroud, which will bring important engineering application to development and modification design of the integrally shrouded blades.

Paper Details

Date Published: 25 August 2009
PDF: 8 pages
Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73751G (25 August 2009); doi: 10.1117/12.839060
Show Author Affiliations
Yan Wang, Changsha Univ. of Science and Technology (China)
Lu-ping Li, Changsha Univ. of Science and Technology (China)
Xu-xiang Lu, Changsha Univ. of Science and Technology (China)
Hong-de Rao, Changsha Univ. of Science and Technology (China)
Yu-jing Liu, Changsha Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 7375:
ICEM 2008: International Conference on Experimental Mechanics 2008
Xiaoyuan He; Huimin Xie; YiLan Kang, Editor(s)

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