کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5017524 1466579 2017 16 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Excitation mechanism of rain-wind induced cable vibration in a wind tunnel
ترجمه فارسی عنوان
مکانیزم تحریک لرزش سیم کشی باران در یک تونل باد
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
چکیده انگلیسی
The rain-wind induced vibration (RWIV) of cables in bridge and wind engineering has been reported worldwide over the past decades. However, quantitative analyses of the RWIV mechanism using the real water rivulets are rare. The RWIV of a cable model is tested in an open-jet wind tunnel. The movement and the geometry of the upper rivulet and the vibration of the cable are obtained by videogrammetry. The coupling of the upper rivulet and cable vibration is shown to be the main excitation mechanism of RWIV. In particular, the oscillating upper rivulet induces the boundary layer to attach to the cable and generates aerodynamic forces, which produce a positive work and excite the cable to vibrate. In turn, the cable vibration harmonizes the upper rivulet along the cable. To verify the proposed mechanism, a numerical model is established using the aerodynamic coefficients measured in dry cable tests. The numerical results are in agreement with the experiments. The effect of the damping ratio on the RWIV amplitude is also experimentally and numerically investigated.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Fluids and Structures - Volume 68, January 2017, Pages 32-47
نویسندگان
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