000013486 001__ 13486
000013486 005__ 20161114165555.0
000013486 04107 $$aeng
000013486 046__ $$k2011-05-25
000013486 100__ $$aNaprstek, J.
000013486 24500 $$aNon-Linear Dynamic Behaviour of a Ball Vibration Absorber

000013486 24630 $$n3.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000013486 260__ $$bNational Technical University of Athens, 2011
000013486 506__ $$arestricted
000013486 520__ $$2eng$$aWind 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 semi-spherical 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 derived. 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 of the Institute of Theoretical and Applied Mechanics. The response spectrum demonstrates a strongly non-linear character of the absorber. The response amplitudes at the top of a TV tower with ball absorber were reduced to 15 ÷ 40% of their original values.

000013486 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013486 653__ $$aVibration ball absorber, Dynamic stability, Nonlinear vibration.

000013486 7112_ $$aCOMPDYN 2011 - 3rd International Thematic Conference$$cIsland of Corfu (GR)$$d2011-05-25 / 2011-05-28$$gCOMPDYN2011
000013486 720__ $$aNaprstek, J.$$iFischer, C.$$iPirner, M.$$iFischer, O.
000013486 8560_ $$ffischerc@itam.cas.cz
000013486 8564_ $$s1110105$$uhttps://invenio.itam.cas.cz/record/13486/files/180.pdf$$yOriginal version of the author's contribution as presented on CD, section: MS 08 Control of Vibrations in Civil Engineering by Passive Active and Semi-Active Devices.
000013486 962__ $$r13401
000013486 980__ $$aPAPER