Abstract
This chapter presents a number of common oscillation phenomena which are not due to a direct external force but due to a feedback mechanism which may depend on the response of a larger system. Accordingly, the frequency of this kind of fluctuation is dictated by a natural frequency rather than a forcing frequency. For example, if a small displacement in a turbine runner creates a labyrinth force that tends to increase the displacement, then this may suddenly start a whirling motion at a natural bending frequency of the shaft line.
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Dörfler, P., Sick, M., Coutu, A. (2013). Stability-Related Unsteady Phenomena. In: Flow-Induced Pulsation and Vibration in Hydroelectric Machinery. Springer, London. https://doi.org/10.1007/978-1-4471-4252-2_6
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DOI: https://doi.org/10.1007/978-1-4471-4252-2_6
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