Avoiding Vibration in Penstocks

by E. T. Moore, Harza Engineering Co, Chicago, United States,



Document Type: Proceeding Paper

Part of: Waterpower '91: A New View of Hydro Resources

Abstract:

One objective of this paper is to indicate the potential sources of pressure pulsations within a hydraulic conduit system and the range of forcing frequencies associated with these sources. A second objective is to indicate what options are available to correct a severe, unacceptable penstock vibration which has developed due to resonance between the forcing frequency of a pressure pulsation and one of the natural vibrating frequencies of a reach of the penstock. In addition, the designer should gain an insight and understanding of how the overall hydraulic conduit system and, in particular, the exposed penstock might be configured and dimensioned during design to avoid possible resonance with calculated forcing frequencies. The designer will know the project's turbine operating characteristics and have the opportunity to make some modifications to the water conduit dimensions.

Subject Headings: Conduits | Vibration | Natural frequency | Resonance | Hydraulic design | Water pressure | Hydraulic structures

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