Root causes of several recent crack failures in turbine units are attributed to oscillation and interaction between generator of turbine unit and devices on the grid, where torsional vibration of the rotor bearing system is observed and identified as an important cause. Exploring vibrational (lateral, torsional, and axial) features in the cracked rotor system with torsional excitation (TE) present can provide a novel view in crack detection and isolation. This work presents dynamic analysis of a cracked rotor system in a steam turbine unit (a typical rotor system with multiple rotors, multiple supports, and oscillating loads), and the vibrational features of the cracked rotor system with comparisons to typical features in monitored vibration data. The results show that coupled vibration in both lateral and torsional components is an effective indicator for cracks in the presence of torsional excitation. Also, vibration characteristics evaluated in different locations of the rotor system are beneficial for fault detection and isolation.
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June 2017
Research-Article
Dynamics of Slant Cracked Rotor for a Steam Turbine Generator System
Chao Liu,
Chao Liu
State Key Laboratory of Control and Simulation
of Power System and Generation Equipments,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: chaoliu08@gmail.com
of Power System and Generation Equipments,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: chaoliu08@gmail.com
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Dongxiang Jiang
Dongxiang Jiang
State Key Laboratory of Control and Simulation
of Power System and Generation Equipments,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: jiangdx@tsinghua.edu.cn
of Power System and Generation Equipments,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: jiangdx@tsinghua.edu.cn
Search for other works by this author on:
Chao Liu
State Key Laboratory of Control and Simulation
of Power System and Generation Equipments,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: chaoliu08@gmail.com
of Power System and Generation Equipments,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: chaoliu08@gmail.com
Dongxiang Jiang
State Key Laboratory of Control and Simulation
of Power System and Generation Equipments,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: jiangdx@tsinghua.edu.cn
of Power System and Generation Equipments,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: jiangdx@tsinghua.edu.cn
1Corresponding author.
Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received December 9, 2015; final manuscript received September 26, 2016; published online January 24, 2017. Assoc. Editor: Rakesh K. Bhargava.
J. Eng. Gas Turbines Power. Jun 2017, 139(6): 062502 (7 pages)
Published Online: January 24, 2017
Article history
Received:
December 9, 2015
Revised:
September 26, 2016
Citation
Liu, C., and Jiang, D. (January 24, 2017). "Dynamics of Slant Cracked Rotor for a Steam Turbine Generator System." ASME. J. Eng. Gas Turbines Power. June 2017; 139(6): 062502. https://doi.org/10.1115/1.4035323
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