Experiments of Vortex-Induced Torsional Oscillation of a Flat Plate in Cross Flow

c = chord, m fvac = frequency of structural system in vacuo, Hz fair = frequency of structural system in air, Hz fvib = vibration frequency of the body, frequency response of structural system, Hz fst = vortex-shedding frequency (Strouhal frequency) from the stationary body, Hz fvs = vortex-shedding frequency from a body in motion, Hz I = mass moment of inertia, kg · m kθ = torsional stiffness of the system, N · m∕rad m = mass per span, kg∕m St = fstc V∞ , Strouhal number Vr = V∞ 2πfvacC , reduced velocity V∞ = freestream velocity, m∕s ζ = damping ratio μ = m∕ρc, mass ratio ρ = density of air, kg∕m

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