567 citations · 1.9k across the 36 of their papers we have counts for
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Constant intensity acoustic propagation in the presence of non-uniform properties and impedance discontinuities: Hermitian and non-Hermitian solutions
Andrew N. Norris
Propagation of sound through a non-uniform medium without scattering is possible, in principle, if the density and acoustic compressibility assume complex values, requiring passive…
Static elastic cloaking, low frequency elastic wave transparency and neutral inclusions
Andrew N. Norris, William J. Parnell
New connections between static elastic cloaking, low frequency elastic wave scattering and neutral inclusions are established in the context of two dimensional elasticity. A cylind…
Non-symmetric flexural wave scattering and one-way extreme absorption
Andrew N. Norris, Pawel Packo
The possibility of asymmetric absorption and reflection for flexural waves is demonstrated though analytical and numerical examples. We focus on the 1D case of flexural motion of a…
Integral identities for reflection, transmission and scattering coefficients
Andrew N. Norris
Several integral identities related to acoustic scattering are presented. In each case the identity involves the integral over frequency of a physical quantity. For instance, the i…
Broadband focusing of underwater sound using a transparent pentamode lens
Xiaoshi Su, Andrew N. Norris, Colby W. Cushing +2
We report an inhomogeneous acoustic metamaterial lens based on spatial variation of refractive index for broadband focusing of underwater sound. The index gradient follows a modifi…
Approximation of the acoustic radiation impedance of a cylindrical pipe
Fabrice Silva, Philippe Guillemain, Jean Kergomard +2
Useful approximation formulae for radiation impedance are given for the reflection coefficients of both infinitely flanged and unflanged rigid-walled cylindrical ducts. The express…