Conical radiating waves from immersed wedges

The finite-element approach has previously been used, with the help of the ATILA code, to model the subsonic and supersonic waves in immersed waveguid es [A. C. Hladky-Hennion et al., J. Sound Vib. 212, 265-274 (1998)]. This m ethod has given a precise account of the experimental results and has shown the major effects. In this paper, a new representation of radiating waves is presented, leading to a simple understanding of the physical phenomenon: radiating waves are propagating with the same phase velocity on the surfac e of a cone, the axis of which is the wedge direction. (C) 2000 Acoustical Society of America. [S0001-4966(00)02512-1].