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Maximum vortex-induced vibrations of a square prism
Barrero-Gil, A.,Fernandez-Arroyo, P. Techno-Press 2013 Wind and Structures, An International Journal (WAS Vol.17 No.1
This paper presents an experimental investigation concerning the peak amplitudes of oscillation of a square prism due to Vortex-Induced-Vibrations (VIV) as a function of the mass damping parameter $m^*{\zeta}$(the so called Griffin--plot); $m^*$ and ${\zeta}$ being, respectively, the non-dimensional mass and the mechanical (structural) damping ratio. With this purpose in mind, an electromagnetic actuator has been employed to provide controlled damping. During the experiments the mass--damping parameter was in the range 0.15 < $m^*{\zeta}$ < 2.4. Experiments show that there is a value of $m^*{\zeta}$ below which VIV appears combined with galloping and the prism oscillation increases monotonically with the incoming flow velocity. For $m^*{\zeta}$ >0.3 the present experiments show a well-defined VIV phenomenon and, consequently, a Griffin-plot can be defined.
Maximum Vortex-Induced Vibrations of a square prism
Barrero-Gil, A.,Fernandez-Arroyo, P. Techno-Press 2013 Wind and Structures, An International Journal (WAS Vol.16 No.4
This paper presents an experimental investigation concerning the peak amplitudes of oscillation of a square prism due to Vortex-Induced-Vibrations (VIV) as a function of the mass damping parameter $m^*{\zeta}$ (the so called Griffin--plot); $m^*$ and ${\zeta}$ being, respectively, the non-dimensional mass and the mechanical (structural) damping ratio. With this purpose in mind, an electromagnetic actuator has been employed to provide controlled damping. During the experiments the mass--damping parameter was in the range 0.15 < $m^*{\zeta}$ < 2.4. Experiments show that there is a value of $m^*{\zeta}$ below which VIV appears combined with galloping and the prism oscillation increases monotonically with the incoming flow velocity. For $m^*{\zeta}$ >0.3 the present experiments show a well-defined VIV phenomenon and, consequently, a Griffin-plot can be defined.
Maximum vortex-induced vibrations of a square prism
A. Barrero-Gil,P. Fernandez-Arroyo 한국풍공학회 2013 한국풍공학회지 Vol.17 No.1
This paper presents an experimental investigation concerning the peak amplitudes of oscillation of a square prism due to Vortex-Induced-Vibrations (VIV) as a function of the mass damping parameter m*S (the so called Griffin--plot); mand S being, respectively, the non-dimensional mass and the mechanical (structural) damping ratio. With this purpose in mind, an electromagnetic actuator has been employed to provide controlled damping. During the experiments the mass--damping parameter was in the range 0.15< m * S < 2.4. Experiments show that there is a value of mS below which VIV appears combined with galloping and the prism oscillation increases monotonically with the incoming flow velocity. For m*S >0.3 the present experiments show a well-defined VIV phenomenon and, consequently, a Griffin-plot can be defined.