Comparisons between predicted and measured acoustic scattering from a wedge

Abstract

Our earlier work has mainly dealt with developing a mathematical approach for predicting acoustc scattering from a wedge for various boundary conditions and wedge material properties. We initially reported scattering for wedge surfaces that satisfy a Dirichlet or a Neumann boundary condition. Recently, our approach was extended to include wedge boundary conditions that can be characterized by an impedance, including absorption. Numerical predictions are found using the Kontorovich-Lebedev transform [A. Erdelyi, Higher Transcendental Functions (McGraw-Hill, New York, 1953)] based upon MacDonald functions, requiring very high precision numerical techniques. We now apply this numerical approach to calculate the monostatic scattering amplitude for a fabricated wedge structure that has been measured in a nonlaboratory environment. Comparisons will be presented and discussed of the results obtained from the predicted and measured monostatic scattering pressures for a range of insonification frequencies at selected offset distances and angles relative to the edge of the wedge.