Název: Study of aeroelastic interference effect among four cylinders arranged in rectangular configuration
Autoři: Hračov, Stanislav ; Macháček, Michael ; Michálek, Petr
Typ dokumentu: Příspěvky z konference
Konference/Akce: Conference with international participation Computational mechanics 2019, Srní (CZ), 20191104
Rok: 2019
Jazyk: eng
Abstrakt: The paper describes the analysis of the destructive oscillation of a skewed steel rod with the length 21 m. The steel rod is a part of roof supporting bundle (rectangular array) of cylindrical hangers at the airport building; it is therefore exposed to frequent moderate and sometimes strong winds with the low turbulence. The vibration is analyzed from the aeroelastic perspective, i.e. the cause of the oscillation is analyzed as wake-induced vibration because the collapse was observed at the bottom downwind hanger in that array configuration. The normalized distance of hangers in horizontal and vertical directions is equal to 3.15D, and 3.8D, respectively, where D is the diameter of the hanger cross section. Experimental testing of 1:1 scaled sectional model of four-cylinder array in the wind tunnel indicates, that the cause of the high level vibration is most probably the interference galloping. The unstable behavior was detected both for the downwind hanger as a part of rectangular array and for the hanger as a part of a two hangers in a row only. The results indicate the strong influence of the top pair of the hangers on the decrease of the critical wind velocity, which is even below the value of the critical wind velocity obtained for two hangers only. The strong hysteresis effect resulting in the preservation of the high vibration amplitudes even after the decrease of wind speed far below the critical one, was observed.
Klíčová slova: aeroelastic interference; flow structure interaction
Číslo projektu: GA19-21817S (CEP)
Poskytovatel projektu: GA ČR
Zdrojový dokument: Proceedings of Computational mechanics 2019, ISBN 978-80-261-0889-4

Instituce: Ústav teoretické a aplikované mechaniky AV ČR (web)
Informace o dostupnosti dokumentu: Dokument je dostupný v příslušném ústavu Akademie věd ČR.
Původní záznam: http://hdl.handle.net/11104/0301121

Trvalý odkaz NUŠL: http://www.nusl.cz/ntk/nusl-407896


Záznam je zařazen do těchto sbírek:
Věda a výzkum > AV ČR > Ústav teoretické a aplikované mechaniky
Konferenční materiály > Příspěvky z konference