Some Unusual Vibrations in Hydro Machineryby Laurence F. Henry, Voith Hydro Inc, York, United States,
Abstract: Most hydro machinery engineers have read the textbook cases of self-exited and flow induced vibrations. Usually such textbook vibrations are only found in the text book! In the real world, they are experienced at the rate of once-in-a-lifetime by hydro machinery engineers. The rarity of such phenomena is a tribute to the designers who avoid awkward combinations of operational frequencies and machinery natural frequencies. Within the last decade the author believes the rate of self excited and flow induced vibration problems seems to have increased. Both new and rehabilitated hydro units are susceptible to these problems as the text of this paper describes.
Subject Headings: Equipment and machinery | Vibration | Natural frequency | Case studies | Rehabilitation | Hydraulics | Pipe flow | Thrust
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