Wind tunnel experiments on unstable self-excited vibration of sectional girders

0422839 - ÚTAM 2015 RIV GB eng J - Journal Article
Král, Radomil - Pospíšil, Stanislav - Náprstek, Jiří
Wind tunnel experiments on unstable self-excited vibration of sectional girders.
Journal of Fluids and Structures. Roč. 44, January (2014), s. 235-250. ISSN 0889-9746. E-ISSN 1095-8622
R&D Projects: GA ČR(CZ) GA103/09/0094; GA AV ČR(CZ) IAA200710902; GA MŠk(CZ) ED1.1.00/02.0060
Institutional support: RVO:68378297
Keywords : flutter derivatives * aeroelastic response * frequency ratio tuning * stability domain * initial disturbance
Subject RIV: JM - Building Engineering
Impact factor: 2.021, year: 2014
http://www.sciencedirect.com/science/article/pii/S0889974613002466

In this paper, a wind tunnel analysis of two degrees-of-freedom system represented by sectional girders is carried out. Besides an evaluation of the aeroelastic coefficients, the analysis is focused on the influence of the natural frequency ratio on the initiation of unstable vibration, which can be of practical interest. On the phenomenological level, the paper also discusses experimentally ascertained response regimes, with an emphasis on their stability character. The attention is paid to the memory effect in the response described by the hysteresis loop together with the separation curves determining the stability boundaries. The influence of initial disturbance on the stability is examined. Two types of cross-sections were investigated: (i) rectangular one with the aspect ratio 1:5, and (ii) bridge-like cross-section with comparable principal dimensions.
Permanent Link: http://hdl.handle.net/11104/0230175