000004674 001__ 4674
000004674 005__ 20141119144543.0
000004674 04107 $$aeng
000004674 046__ $$k2002-06-02
000004674 100__ $$aNáprstek, Jiří
000004674 24500 $$aNON-LINEAR BEHAVIOUR AND DYNAMIC STABILITY OF A VIBRATION SPHERICAL ABSORBER

000004674 24630 $$n15.$$pProceedings of the 15th ASCE Engineering Mechanics Division Conference
000004674 260__ $$bColumbia University in the City of New York
000004674 506__ $$arestricted
000004674 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 spherical type of absorber can be recommended. In general, it is a semi-spherical horizontal dish in which a sphere of a smaller diameter is rolling. Ratio of both diameters, mass of the rolling sphere, quality of contact surfaces and other parameters should correspond with characteristics of the structure. The spherical absorber is modelled as a holonomous system. Using Lagrange equations of the second type, governing nonlinear 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 spherical absorber were reduced to 15-40% of their original values. 

000004674 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000004674 653__ $$aSpherical absorber, dynamic stability, nonlinear vibration.

000004674 7112_ $$a15th ASCE Engineering Mechanics Division Conference$$cNew York (US)$$d2002-06-02 / 2002-06-05$$gEM2002
000004674 720__ $$aNáprstek, Jiří$$iPirner, Miroš
000004674 8560_ $$ffischerc@itam.cas.cz
000004674 8564_ $$s340205$$uhttps://invenio.itam.cas.cz/record/4674/files/150.pdf$$yOriginal version of the author's contribution as presented on CD, .
000004674 962__ $$r4594
000004674 980__ $$aPAPER