Dynamics of a vibration damperworking on a principle of a heavy ball rolling inside a spherical dish

0364238 - ÚTAM 2012 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Náprstek, Jiří - Fischer, Cyril - Pirner, Miroš
Dynamics of a vibration damperworking on a principle of a heavy ball rolling inside a spherical dish.
Engineering Mechanics 2011. Prague: Institute of Thermomechanics AS CR, v. v. i., 2011 - (Fuis, V.), s. 403-406. ISBN 978-80-87012-33-8.
[Engineering Mechanics 2011 /17./. Svratka (CZ), 09.05.2011-12.05.2011]
Grant CEP: GA AV ČR(CZ) IAA200710805; GA ČR(CZ) GA103/09/0094; GA AV ČR(CZ) IAA200710902
Výzkumný záměr: CEZ:AV0Z20710524
Klíčová slova: vibration ball absorber * dynamic stability * non-linear vibration
Kód oboru RIV: JM - Inženýrské stavitelství

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.
Trvalý link: http://hdl.handle.net/11104/0199769