V. Experimental determination of the aerodynamic damping on a vibrating circular cylinder

Abstract

For an infinitely-long circular cylinder oscillating rectilinearly along a diameter, the damping force is determined from experimental measurements of the damping force on a circular cylinder oscillating about one end. At. very small amplitudes of vibration, up to about one-tenth of the diameter, good agreement is obtained with Stokes' theoretical result for the viscous damping force at infinitesimal amplitudes of vibration. But at larger amplitudes, the damping force is found to increase linearly with amplitude; an empirical theory is given which is in qualitative agreement with this result.