フラッタを生じる旗に作用する風荷重測定

概要

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Wind loads acting on various types of flag, which is supposed to be used in outdoor events, is studied through wind tunnel test. Major experimental parameters are mass ratio (material density/air density), length/width ratio and wind velocity. Our findings are as follows. 1) Peak drag force coefficient is empirically reduced to a function of mass ratio. 2) Various wind force coefficients, such as for mean and RMS( root mean square) drag force and RMS and peak lift force, are expressed as a function of peak drag coefficient. 3) Prevailing frequency observed on fluttering flags are roughly described as a function of mass ratio. This frequency can be quantitatively explained by the second natural frequency of a hinged beam on which uniformly distributed tensile force is acting.
一般社団法人日本建築学会の論文
2008-03-25