کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
292881 511084 2012 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Nonlinear dynamics of silk and Mylar flags flapping in axial flow
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی های تجدید پذیر، توسعه پایدار و محیط زیست
پیش نمایش صفحه اول مقاله
Nonlinear dynamics of silk and Mylar flags flapping in axial flow
چکیده انگلیسی

In this study, experiments were conducted on the flapping dynamics of flags immersed in fairly noisy axial flow. The experimental set-up was first validated by comparing the critical conditions for flapping onset with relevant results from other experimental investigations, numerical simulations and theoretical models found in the literature. Short and long flags, as well as flags with aspect ratio equal to unity, were considered. Nonlinear dynamic analyses including power spectra, phase-space portraits, Poincaré sections and circle maps obtained from the flag transverse displacement time-series indicate that the observed non-periodic flapping mainly arises through a quasi-periodic scenario. This paper also reports for the first time a "switching" oscillation phenomenon, which is closely related to hysteresis and bistability phenomena.


► We investigated the flapping dynamics of silk and Mylar flags of different aspect ratio.
► We used nonlinear time series analysis as method to investigate the nonlinear dynamics.
► We report a new state of bistability.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Wind Engineering and Industrial Aerodynamics - Volumes 107–108, August–September 2012, Pages 225–236
نویسندگان
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