METHOD AND APPARATUS FOR DETERMINING FLOW RESISTANCE OF FULLY ASSEMBLED ACOUSTIC LINERS.

摘要

An apparatus and method to determine the steady state flow resistance of assembled acoustic liners. Resistance is measured by applying a cylindrical waveguide (12) to the face of the liner (10). Two pressure transducers (17A) and (17B) mounted on the waveguide, measure pressure at two different points inside the waveguide, while the face of the liner is subject to a sinusoidal pressure field.