Quarterly Progress Report for April, May, and June 1970
Abstract
In Section 1 it is shown by using the simplest reflecting surface--an infinite, pressure release plane surface--that at least the Fresnel phase approximation and a reasonable directivity pattern approximation are necessary before accurate predictions in surface reflection and scattering problems can be made. The average Rayleigh reflection coefficient for random penetrable surfaces of various roughnesses is calculated in Section 2. In Section 3 an integral expression is derived for the acoustic field of a point source in a surface duct with a rough boundary. The integral was obtained by Green's functions and includes the rough surface condition by means of an effective impedance condition which also depends on the properties of the medium.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 21, 1970
- Accession Number
- ADA037370
Entities
Organizations
- University of Texas at Austin