Radiation emitted by a constant load in a circular motion on an elastically supported Mindlin plate

Wave radiation is studied which is due to a constant load moving with a con stant speed along a circular path over an unbounded Mindlin plate on a Wink ler foundation. The steady state solution of the problem is obtained, showi ng that the radiation of elastic waves occurs for all non-zero load velocit ies. It is shown that the elastic wave field radiated by the supercriticall y moving load is confined in a spiral-like apex. The plate displacements at the boundaries of this apex are discontinuous. The radiated energy per per iod of load rotation is calculated as showing a discrete energy spectrum. F or 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. (C) 2001 Academic Press.