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Citation:
　Haoyang Cen,Rupp Carriveau,David S-K Ting.Effect of Mass Ratio on Hydrodynamic Response of a Flexible Cylinder[J].Journal of Marine Science and Application,2016,(1):50-62.[doi:10.1007/s11804-016-1339-9]
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Effect of Mass Ratio on Hydrodynamic Response of a Flexible Cylinder

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Title:
Effect of Mass Ratio on Hydrodynamic Response of a Flexible Cylinder
Author(s):
Haoyang Cen;  Rupp Carriveau;  David S-K Ting
Affilations:
Author(s):
Haoyang Cen;  Rupp Carriveau;  David S-K Ting
Turbulence and Energy Laboratory, Centre for Engineering Innovation, University of Windsor, Ontario N9B 3P4, Canada
Keywords:
flow-induced vibration; low mass ratio; flexible cylinder; multi-frequency response; hydrodynamic response
分类号:
-
DOI:
10.1007/s11804-016-1339-9
Abstract:
The effect of the mass ratio on the flow-induced vibration(FIV) of a flexible circular cylinder is experimentally investigated in a towing tank.A Tygon tube with outer and inner diameters of 7.9 mm and 4.8 mm, respectively, was employed for the study.The tube was connected to a carriage and towed from rest to a steady speed up to 1.6 m/s before slowing down to rest again over a distance of 1.6 m in still water.Reynolds number based on the cylinder’s outer diameter was 800-13, 000, and the reduced velocity(velocity normalized by the cylinder’s natural frequency and outer diameter) spanned from 2 to 25.When connected, the cylinder was elongated from 420 mm to 460 mm under an axial pre-tension of 11 N.Based on the cylinder’s elongated length, the aspect ratio(ratio of the cylinder’s length to outer diameter) was calculated as 58.Three mass ratios(ratio of the cylinder’s structural mass to displaced fluid mass, m*) of 0.7, 1.0, and 3.4 were determined by filling the cylinder’s interior with air, water, and alloy powder(nickel-chromium-boron matrix alloy), respectively. An optical method was adopted for response measurements. Multi-frequency vibrations were observed in both in-line(IL) and cross-flow(CF) responses;at high Reynolds number, vibration modes up to the 3rd one were identified in the CF response.The mode transition was found to occur at a lower reduced velocity for the highest tested mass ratio.The vibration amplitude and frequency were quantified and expressed with respect to the reduced velocity.A significant reduced vibration amplitude was found in the IL response with increasing mass ratios, and only initial and upper branches existed in the IL and CF response amplitudes.The normalized response frequencies were revealed to linearly increase with respect to the reduced velocity, and slopes for linear relations were found to be identical for the three cases tested.

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Memo

Memo:
Received date: 2015-09-23;Accepted date: 2015-10-30。
Corresponding author: Rupp Carriveau, E-mail:rupp@uwindsor.ca
Last Update: 2016-07-06