4pAA7. Higher-order modal reflection and transmission in acoustic waveguide step discontinuities.

Session: Thursday Afternoon, May 16

Time: 4:15

Author: Ralph T. Muehleisen
Location: Appl. Res. Lab., Penn State Univ., P.O. Box 30, State College, PA 16804


Analytic expressions for the transmission and reflection coefficients of higher-order modes at a step discontinuity in an acoustic waveguide are developed. The equations take on the familiar form of an impedance discontinuity when written in matrix form. Numerical results show that there is significant modal coupling which indicates that the coupling cannot be ignored in the design of duct systems.

from ASA 131st Meeting, Indianapolis, May 1996