ASA 127th Meeting M.I.T. 1994 June 6-10

3pSAb4. Animation of the transient motion and radiation of a fluid-loaded membrane.

Douglas Rollow

David C. Swanson

Graduate Program in Acoust., Penn State Univ., P.O. Box 30, University Park, PA 16802

A fluid-loaded membrane, excited on the surface with an impulsive force, is modeled and animated to visualize the surface motion and resulting radiated field. The system is represented by a linear model of structural modes coupled to an unbounded light fluid, typical of a thin baffled Mylar membrane in air. The effects of fluid loading are found by analytical methods and a boundary element application program, and the field is found by direct use of the Rayleigh integral and FFT methods. The structural motion is also shown in the wave-number domain for an understanding of the coupling of power to the far field. [Work supported by the Exploratory and Foundational Fund, Applied Research Laboratory.]