ASA 125th Meeting Ottawa 1993 May

5pPA7. Acoustic diffraction by multiple two-dimensional objects; its calculation using an approximate integral method.

T. R. T. Nightingale

Bldg. M-27, Acoust. Lab., Inst. for Res. in Construction, Natl. Res. Council, Ottawa, ON K1A 0R6, Canada

A method for determining the diffracted or scattered components of an acoustical wave by multiple two-dimensional objects is given. The method presented uses approximate boundary conditions to simplify the cumbersome set of integral equations associated with nonapproximate analytic solutions of the Helmholtz integral. The approximate boundary conditions are used to calculate the insertion loss for multiple two-dimensional objects of various sizes. The predictions are compared to measured results and limitations are discussed.