EXPERIMENTAL MOTION ANALYSIS OF RADIALLY ROTATING BEAMS USING HIGH-SPEED CAMERA AND MOTION ANALYZER

Although strain gauges can be attached to a system for vibration analy sis, wires connected to the strain gauges may disturb the system and a ffect the accuracy of the strain measurement. As an alternative, this work presents the use of a high-speed camera combined with a motion an alyzer to study the motion of rotating flexible beams. One end of the beam is rigidly connected to a motor, while the other end is free. Whi te stickers placed on selected points on a given beam are the referenc e points in a digitization process. The modes of the vibrating beams c an be filmed and analyzed. The vibration parameters, such as deflectio n and frequency, can be obtained by using a film motion analyzer. The results show that the beam does not behave in a clamped-free or a pinn ed-free fashion, but instead occurs at an intermediate boundary betwee n thee two classical conditions. (C) 1996 John Wiley & Sons, Inc.