Počet záznamů: 1
Theoretical and experimental study of coupled rocking-swivelling model of guyed mast shaft
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SYSNO ASEP 0453087 Druh ASEP A - Abstrakt Zařazení RIV Záznam nebyl označen do RIV Název Theoretical and experimental study of coupled rocking-swivelling model of guyed mast shaft Tvůrce(i) Urushadze, Shota (UTAM-F) RID, ORCID, SAI
Pirner, Miroš (UTAM-F) RID, ORCID, SAI
Fischer, Ondřej (UTAM-F) RID, ORCID, SAICelkový počet autorů 3 Zdroj.dok. EVACES'15. International conference on experimental vibration analysis for civil engineering structures. - Dübendorf : EMPA, 2015 / Feltrin G. - ISBN N
S. 27-27Poč.str. 1 s. Forma vydání Tištěná - P Akce International Conference on Experimental Vibration Analysis for Civil Engineering Structures Datum konání 19.10.2015 - 21.10.2015 Místo konání Dübendorf Země CH - Švýcarsko Typ akce WRD Jazyk dok. eng - angličtina Země vyd. CH - Švýcarsko Klíč. slova guyed mast shaft ; swivelling ; wind-excited vibration Vědní obor RIV JM - Inženýrské stavitelství CEP GC13-34405J GA ČR - Grantová agentura ČR Institucionální podpora UTAM-F - RVO:68378297 Anotace Systematic monitoring of torsion (swivelling) of guyed mast shafts has been performed in ITAM since 2005. The occurence of this phenomenon is conditioned by the fact that the guy ropes are attached to the surface of the shaft, i.e. out of its axis. The simple static calculation model serves for making the proof of the occurence of the moment, affecting the shaft, which is guyed by three ropes. The exact theoretical solution of the real phenomenon assumes the introduction of dynamics of guy ropes, which vibrate in 3D shapes during the shaft's movement along the orbit and it's torsion (swivelling). As well as a detailed determination of the aerodynamic characteristic of the shaft cross-section with respect to the conditions of aerodynamic instability. In more detail and more stable aerodynamic conditions was the phenomenon of swivelling of the mast shaft examined on simple model. The shaft was a tube of hardened PVC, of an outer diameter of 75 mm, supported by a point at the bottom guyed by three wires in one level. The out of axis was changed for its influence estimation. The flexural rigidity of the shaft is not modelled; the bending is substituted by the tilting. That is why there are no higher shapes of tilting and the orbit is always close to ellipse. The torsion was verified in a wind tunnel. The experiment have been performed in the new aerodynamic tunnel (ITAM- Telč). Wind tunnel section size enabled experiment with model shaft up to 1500 mm high, anchored by three ropes at a height of 1000 mm. The top end of the shaft was equipped with a horizontal arm two accelerometers attached on its ends; the distance between the accelerometers in 380 mm. Accelerometers 1 and 2 sense the motion ion the direction perpendicular to the horizontal arm. Besides the two accelerometers on the horizontal arm there is also the third accelerometer at the upper end of the shaft, which senses the motion perpendicular to the direction of the above pair of accelerometers. Pracoviště Ústav teoretické a aplikované mechaniky Kontakt Kulawiecová Kateřina, kulawiecova@itam.cas.cz, Tel.: 225 443 285 Rok sběru 2016
Počet záznamů: 1