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Title: The scattering of sound waves in two-dimensional ducts with discontinuities in height and material property
Author: Warren, Daniel
ISNI:       0000 0001 3563 5688
Awarding Body: Brunel University
Current Institution: Brunel University
Date of Award: 1999
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Eigen-mode matching techniques offer a versatile approach for solving acoustic scattering problems in ducts. However, until recently, these techniques have been restricted to problems in which the boundary conditions contain at most one derivative, that is, Neumann, Dirichlet or Robin's conditions. Here a method is developed to solve scattering problems in ducts that are discontinuous in height and have at least one surface described by a high order boundary condition. Attention is focussed on the membrane condition, but the method can be extended to elastic plates and other higher order conditions. An original orthogonality condition is derived and used to solve two problems. Limiting cases of the results are compared with some special cases solveable by standard Fourier techniques and (for the case of no height discontinuity) the Wiener-Hopf technique.
Supervisor: Lawrie, J. B. Sponsor: Brunel University Department of Mathematical Sciences
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Acoustics & noise analysis