Abstract:

The radiation and partial radiation efficiencies from point and line driven panels were previously defined and investigated by the authors [J. Acoust. Soc. Am. 98, 2888(A) (1995) and J. Sound Vib. 144, 71--86 (1991)]. In this paper, the mechanical power dissipated in a point driven fluid loaded panel is studied and compared to the radiated power. The interdependence of the mechanical and the radiated powers is investigated, and they are related as fractions of the total input power. The dependencies of the mechanical and radiated power on frequency, fluid loading, and mechanical loss are further studied. In the present paper, the mechanical power as well as the radiation efficiency is shown to increase with increased damping in a panel while the radiated power decreases, as it must. These results again show the fallibility of the conclusion that ``a higher radiation efficiency necessarily implies more radiated power.'' The results of computer experiments are cited in numerical examples.