Distributed Wave Field Synthesis
Many problems in geophysics, acoustics, elasticity theory, cancer treatment, food process control and electrodynamics involve study of wave field synthesis in some form or another. In the present work, the modeling of wave propagation phe- nomena is studied as a static problem, using Finite Element Methods and treating time as an additional spatial dimension. In particular wave field synthesis problems are analyzed using discrete methods. It is shown that a fully finite element based scheme is a very natural and effective method for the solution of such problems. Distributed wave field synthesis in the context of two-dimensional problems is outlined and incorporation of any geometric or material non-linearities is shown to be straightforward. This has significant implications for problems in geophysics or biological media where material inhomogeneities are quite prevalent. Numerical results are presented for several problems referring to media with material inho- mogeneities and predefined absorption profiles. The method can be extended to three dimensional problems involving anisotropic medium properties in a relatively straightforward manner.
Finite elements, Inverse problems, Wave equation, Acoustics, Wave Field Synthesis, Noise cancelation
dissertation or thesis