Implementation of a frequency-dependent impedance boundary model into a room acoustic solver with time-domain finite element method

摘要

A room acoustic solver with time-domain finite element method (TD-FEM) is a recently developed time-domain wave-based solver with inherent benefits for modeling complex geometries [1–6]. In general, performing reliable room acoustic simulations using extended-reacting sound absorber models that can incorporate frequency and incident angle dependence of sound absorption characteristics is important. However, acoustic TD-FEM has conventionally used a frequency-independent locally reacting impedance boundary model to treat sound absorbers because of its simple implementation. Some earlier works [3–5] investigating acoustic TD-FEM have used an extended-reacting model for a specific sound absorber, but difficulties in time-domain sound absorber modeling for TD-FEM have not been resolved yet. The present paper addresses frequency-dependent locally reacting impedance boundaries as a basis of constructing an efficient extended-reacting model.