Sound propagation is described by the wave equation,and the spatial geometry of standing wave patterns formed by multiple waves is described by the Helmholtz equation. Solution techniques are well-known for these equations, and solution surfaces can be determined and tailored to obtain desired surface shapes. From these solutions, the fluid velocity and pressure field can also be determined. Particle mechanics in this field can also be computed. This poses some uncertainties, especially in the microgravity environment, which requires experimental validation. The data recovered from our flight-tests abroad NASA's KC-135 will enable us to remove such unknowns and advance the theory of acoustic levitation to acousticmanufacturing.

__REFERENCES__

Pierce, A.D., "Acoustics". McGraw-Hill, 1980.

Landau, L.D., Lifshitz, E.M., "Fluid Mechanics".Course on Theoretical Physics, Volume 6, Pergamon Press, 1987, p. 305-307.

Wanis, S.S., Sercovich,A.H., Komerath, N.M., "Acoustic Shaping in Microgravity: Higher Order SurfaceShapes", AIAA Paper 99-0954, 37th Aerospace Sciences Meeting & Exhibit,Reno, NV, January 1999.