A Resurgence of Torsional Vibration Concerns for Nuclear and Fossil Steam Turbine Generator Retrofits

Reid, S.R.; Lewis, James B.

doi:10.1115/icone20-power2012-55139

Volume 3: Thermal-Hydraulics; Turbines, Generators, and Auxiliaries 2012

DOI: 10.1115/icone20-power2012-55139

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A Resurgence of Torsional Vibration Concerns for Nuclear and Fossil Steam Turbine Generator Retrofits

S.R. Reid¹,

James B. Lewis

Abstract: Based on a recent assessment of nuclear generating stations in the US, Spain and Belgium, TG Advisers identified over 20 units with various levels of torsional vibration system concerns. This was a surprising result given the relatively long and successful power generation industry history in understanding and addressing this dangerous failure mechanism.

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Experimental study of coupled shaft bending - blade umbrella mode vibration of a turbine rotor model

Kudo

Shiohata²,

Matsushita³

et al. 2014

Transactions of the JSME (In Japanese)

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This paper describes an experimental study on the characteristics of blade-shaft coupled bending vibration of a rotor system with a bladed disk. In a rotor with relatively long blades such as low-pressure steam turbines, the coupled vibration of shaft torsional and blade bending vibration with nodal diameter of zero (umbrella mode) must be considered in terms of reliability. The bending-torsion coupled resonance of rotor systems occurs under specific conditions, when the rotational speed is equal to the sum and/or difference of the bending natural frequency and torsional natural frequency. In this study, a test apparatus with a flexible rotor equipped with a bladed disk which simulates actual turbine blade structure was developed to study the coupled vibration characteristics of shaft bending and blade (κ=0). The rotor was excited with an active magnetic bearing for lateral direction and a servomotor for torsional direction. Resonance of a bladed disk with nodal diameter (κ) of zero, which was coupled with the rotor's torsional vibration, occurred under the above specific condition with lateral excitation force where frequency was equal to the rotor's bending natural frequency. In addition, resonance of rotor bending vibration was found when the rotor was excited in torsional direction of its natural frequency.

show abstract

Experimental study of coupled shaft bending - blade umbrella mode vibration of a turbine rotor model

Kudo

Shiohata²,

Matsushita³

et al. 2014

Transactions of the JSME (In Japanese)

View full text Add to dashboard Cite

show abstract

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A Resurgence of Torsional Vibration Concerns for Nuclear and Fossil Steam Turbine Generator Retrofits

Cited by 1 publication

References 0 publications

Experimental study of coupled shaft bending - blade umbrella mode vibration of a turbine rotor model

Experimental study of coupled shaft bending - blade umbrella mode vibration of a turbine rotor model

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