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- W137270922 abstract "During the commissioning of a low pressure steam turbine the last stage blades experienced severe vibration levels. An inspection revealed cracks in the blades and failures of lashing wires. Cracked blades were substituted and a tip timing measurement system was installed for monitoring last stage blade vibrations, in order to investigate the dynamic behaviour of the blade row in different operating conditions. The main results of this test campaign are presented in the paper: the severe vibrations were due to a fluid-dynamic instability coupled to one vibration mode of the blade group (also called flutter instability). A modified blade has also been designed in order to reduce its sensitivity to the operating conditions which could cause the instability. Its dynamic behaviour has been numerically investigated, the grouping of blades in packs has been optimized in order to avoid resonances with engine order excitations, and finally the new blades have been substituted in the turbine. The measurement results which are briefly described in the paper have shown a considerable improvement of the turbine dynamic behaviour." @default.
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- W137270922 date "2012-01-01" @default.
- W137270922 modified "2023-09-25" @default.
- W137270922 title "Analysis of LP steam turbine blade vibrations: experimental results and numerical simulations" @default.
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- W137270922 doi "https://doi.org/10.1533/9780857094537.4.189" @default.
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