Abstract
The purpose of the present investigation is to estimate separately internal and external damping coefficients of flexible beams. It is assumed that the internal damping force is proportional to the strain rate in bending of the beam, and the external damping force is proportional to the velocity of the bending vibration and the area that receives aerodynamic resistance. Internal damping coefficient is determined by the logarithmic decrement that obtained from the experimental waveform of a damped free vibration under vacuum conditions. External damping coefficient is determined by the internal damping coefficient and the logarithmic decrement that obtained under atmospheric pressure. As the result, it is clarified that the validity of the separate estimation method for stainless steel, brass and phosphor bronze and that influence of the aerodynamic resistance on an attenuation of vibration couldn't be disregarded.
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