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Study of aeroelastic interference effect among four cylinders arranged in rectangular configuration
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SYSNO ASEP 0510728 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Study of aeroelastic interference effect among four cylinders arranged in rectangular configuration Author(s) Hračov, Stanislav (UTAM-F) RID, SAI
Macháček, Michael (UTAM-F) ORCID, SAI, RID
Michálek, Petr (UTAM-F) ORCID, RID, SAINumber of authors 3 Source Title Proceedings of Computational mechanics 2019. - Plzeň : University of West Bohemia, 2019 / Adámek V. ; Jonášová A. ; Plánička S. ; Zajíček M. - ISBN 978-80-261-0889-4 Pages s. 76-79 Number of pages 4 s. Publication form Medium - C Action Conference with international participation Computational mechanics 2019 Event date 04.11.2019 - 06.11.2019 VEvent location Srní Country CZ - Czech Republic Event type EUR Language eng - English Country CZ - Czech Republic Keywords aeroelastic interference ; flow structure interaction Subject RIV JM - Building Engineering OECD category Civil engineering R&D Projects GA19-21817S GA ČR - Czech Science Foundation (CSF) Institutional support UTAM-F - RVO:68378297 Annotation 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. Workplace Institute of Theoretical and Applied Mechanics Contact Kulawiecová Kateřina, kulawiecova@itam.cas.cz, Tel.: 225 443 285 Year of Publishing 2020
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