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Self-Excited Oscillations from Overfall Streaming

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The aim of the foregoing work is the study of the stabilisation of a suddenly falling stream (waterfall) over a rigid damhead, having a closed-off air volume. The dynamic equation is set up for a vertically falling free stream under the influence of a changing pressure p 1 in the air cushion. The form of the streaming thus obtained is compared with a momentary picture (snapshot) assumed in a model waterfall. Using energy considerations the frequency of the self-excited vibrations is determined approximately and compared with the experimental values. Volume compression becomes essential through large air pocket and jet intensity, and from the average stream excursion and volume compression K the stream motion up to a pressure p 2 can be calculated. Nevertheless in the model built the air cushion was so stiff that other effects could operate. For large dams the question of stabilisation is discussed by means of the locus curve of the overall transmission factor p 2/p i with the help of the Strecker-Nyquist criterion.
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Document Type: Research Article

Publication date: August 1, 1972

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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