THE HERSCHEL-QUINCKE TUBE - A THEORETICAL, COMPUTATIONAL, AND EXPERIMENTAL INVESTIGATION

A general expression for the transmission loss characteristics of the Herschel-Quincke tube is developed. This relationship eliminates the r estrictions on duct cross-sectional area employed in earlier analytica l studies. The attenuation of sound by this configuration is also stud ied computationally in terms of a nonlinear one-dimensional finite-dif ference model that solves the balance equations of mass, momentum, and internal energy, coupled with the ideal gas equation of state. Transm ission loss predictions from both analytical and computational models are then shown to correlate well with experimental data acquired from an extended impedance tube setup.