Development of excitation test method for non-synchronous vibration of rotating turbine blade (Measurement of damping of non-synchronous vibration mode)

In order to analyze the blade vibration caused by flutter, it is necessary to understand both the aerodynamic damping and structural damping of the high vibration stress. Flutter Vibration mode occurring in the rated speed is non-synchronous mode. To measure non-synchronous mode damping, high freque...

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Published inKikai Gakkai ronbunshū = Transactions of the Japan Society of Mechanical Engineers Vol. 82; no. 838; p. 15-00603
Main Authors AKIYAMA, Ryou, SHIOHATA, Koki, NAKAJIMA, Tomomi, YAMASHITA, Yutaka
Format Journal Article
LanguageJapanese
English
Published The Japan Society of Mechanical Engineers 2016
Subjects
Blade
Damping
High frequency excitation
Natural frequency
Non-synchronous mode
Turbine
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Abstract In order to analyze the blade vibration caused by flutter, it is necessary to understand both the aerodynamic damping and structural damping of the high vibration stress. Flutter Vibration mode occurring in the rated speed is non-synchronous mode. To measure non-synchronous mode damping, high frequency excitation magnet was developed. Damping characteristics of the non-synchronous mode of nodal diameter 12 and 4 were measured in the rotation test. For comparison, synchronous mode of nodal diameter 4 was measured. From these results, it was concluded as follows. (1) It is possible to excite non-synchronous mode by high frequency excitation magnet and measure the damping ratio. (2) According to the measurement results of non-synchronous mode of nodal diameter 12 and 4, damping ratio is increased if the excitation force become large. Synchronous mode of nodal diameter 4 is also a similar trend. (3) Nodal diameter 4 damping ratio of non-synchronous mode(Resonance speed : 100%) was lower than synchronous mode(Resonance speed : 75%). (4) When evaluating flutter which occurs at rated speed, it is necessary to measure structural damping ratio at rated speed.
AbstractList In order to analyze the blade vibration caused by flutter, it is necessary to understand both the aerodynamic damping and structural damping of the high vibration stress. Flutter Vibration mode occurring in the rated speed is non-synchronous mode. To measure non-synchronous mode damping, high frequency excitation magnet was developed. Damping characteristics of the non-synchronous mode of nodal diameter 12 and 4 were measured in the rotation test. For comparison, synchronous mode of nodal diameter 4 was measured. From these results, it was concluded as follows. (1) It is possible to excite non-synchronous mode by high frequency excitation magnet and measure the damping ratio. (2) According to the measurement results of non-synchronous mode of nodal diameter 12 and 4, damping ratio is increased if the excitation force become large. Synchronous mode of nodal diameter 4 is also a similar trend. (3) Nodal diameter 4 damping ratio of non-synchronous mode(Resonance speed : 100%) was lower than synchronous mode(Resonance speed : 75%). (4) When evaluating flutter which occurs at rated speed, it is necessary to measure structural damping ratio at rated speed.
Author YAMASHITA, Yutaka
AKIYAMA, Ryou
NAKAJIMA, Tomomi
SHIOHATA, Koki
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  organization: Ibaraki Univ. Dept. of Mechanical Engineering and Gas Turbine Development Design Group, MHPS Ltd
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  fullname: SHIOHATA, Koki
  organization: Department of Mechanical Engineering, Ibaraki University
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  organization: Steam Turbine Development & Design Group, Steam Turbine Products Headquarters, MHPS Ltd
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SubjectTerms Blade
Damping
High frequency excitation
Natural frequency
Non-synchronous mode
Turbine
Title Development of excitation test method for non-synchronous vibration of rotating turbine blade (Measurement of damping of non-synchronous vibration mode)
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