Original title: Dynamics of a vibration damperworking on a principle of a heavy ball rolling inside a spherical dish
Authors: Náprstek, Jiří ; Fischer, Cyril ; Pirner, Miroš
Document type: Papers
Conference/Event: Engineering Mechanics 2011 /17./, Svratka (CZ), 2011-05-09 / 2011-05-12
Year: 2011
Language: eng
Abstract: Wind excited vibrations of slender structures such as towers, masts or certain types of bridges can be reduced using passive or active vibration absorbers. If there is available only a limited vertical space to install such a device, a ball type of absorber can be recommended. In general, it is a semispherical horizontal dish in which a ball of a smaller diameter is rolling. Ratio of both diameters, mass of the rolling ball, quality of contact surfaces and other parameters should correspond with characteristics of the structure. The ball absorber is modeled as a holonomous system. Using Lagrange equations of the second type, governing non-linear differential system is carried out. The solution procedure combines analytical and numerical processes. As the main tool for dynamic stability investigation the 2nd Lyapunov method is used. The function and effectiveness of the absorber identical with those installed at the existing TV towers was examined in the laboratory.
Keywords: dynamic stability; non-linear vibration; vibration ball absorber
Project no.: CEZ:AV0Z20710524 (CEP), IAA200710805 (CEP), GA103/09/0094 (CEP), IAA200710902 (CEP)
Funding provider: GA AV ČR, GA ČR, GA AV ČR
Host item entry: Engineering Mechanics 2011, ISBN 978-80-87012-33-8

Institution: Institute of Theoretical and Applied Mechanics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0199769

Permalink: http://www.nusl.cz/ntk/nusl-55934


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