Vibration Problems of Penstock Piping for a Vertical Tubular Hydraulic Turbineby Charles Pistner, Voith Hydro Inc, United States,
Scott Garner, Voith Hydro Inc, United States,
Document Type: Proceeding Paper
Part of: Waterpower '89
Excessive vibration amplitudes were experienced in the vertical gated tubular units at the Great Falls Hydroelectric Project located in the City of Paterson, New Jersey. Vibration amplitude measurements taken at the top of the generator housing were high; the highest amplitude of vibration occurred just before synchronizing the units at a speed of 400 RPM (6.66 HZ). Measurements indicated that a resonant frequency condition existed between the intake pipe and the generator support section. This paper discusses the finite element computer analysis used to analytically determine the frequency and mode shape of vibration and the structural design changes required to stiffen the unit to overcome the vibration.
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