RADIATION EMITTED BY A CONSTANT LOAD IN A CIRCULAR MOTION ON AN ELASTICALLY SUPPORTED MINDLIN PLATE

摘要

Wave radiation is studied which is due to a constant load moving with a constant speed along a circular path over an unbounded Mindlin plate on a Winkler foundation. The steady state solution of the problem is obtained, showing that the radiation of elastic waves occurs for all non-zero load velocities. It is shown that the elastic wave field radiated by the supercritically moving load is confined in a spiral-like apex. The plate displacements at the boundaries of this apex are discontinuous. The radiated energy per period of load rotation is calculated as showing a discrete energy spectrum. For increasing load velocities, the total amount of radiated energy becomes larger. It is also shown that the major part of the radiated energy follows the direction of the load motion.