Forced acoustical response of a cavity coupled with a semi-infinite space using coupled mode theory

This paper presents a study of the forced acoustical response of an open cavity coupled with a semi-infinite space by using acoustic coupled mode theory, an approach analogous to effective non-Hermitian Hamiltonian method. The reduced differential operator of the open cavities and associated frequency-dependent basis functions are obtained in order to describe the sound field in terms of modal expansion. The properties and physical behavior of this expansion are numerically investigated and explained using computational examples.