FORCED VIBRATION OF UNEVENLY DISTRIBUTED MASSES.
MONTANA STATE UNIV MISSOULA
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Forced vibration has been used extensively in the transportation or separation of various sized particles. The forcing frequency is usually created with a rotating or reciprocating unbalance that impresses a periodic, harmonic motion. This motion is directed to impart both a horizontal and a vertical movement to the particle. The development of the equations is shown, with their boundary conditions, that describe the motion of unattached particles on a vibrating platform. Results from these theoretical equations were tabulated in table form and compared with the test results. A high powered stroboscope was used with a photoelectric pickoff and a flash delay to photograph various stages in the cycle of rock particles on a vibrating platform. The position of the eccentric weights was used as a marker to determine the point in the vibrating platforms cycle that the photographs were taken. Various exciting frequencies and exciting forces were photographed for comparison with the theoretical results.