Toward a theory of wave energy transport in large irregular structures.
An ansatz is proposed by which the energy transport behavior observed at early times in a direct numerical simulation (DNS) of a large irregular structure may be extrapolated to arbitrary times. In the slow-transport limit, this ansatz leads to a diffusion-like equation, similar to that of time-domain statistical energy analysis (SEA), but it does not require substructuring. The model is successfully used to extract diffusion parameters from simulated data of unambiguously diffusive character. The model is then successfully used to extract diffusion parameters from data obtained in a DNS of a simple undamped two-room structure of a kind typically analyzed by SEA or room acoustics.
Wolff
Nicholas L
NL
Department of Theoretical and Applied Mechanics, University of Illinois at Urbana-Champaign, 216 Talbot Lab, 104 S. Wright Street, Urbana, Illinois 61801, USA.
Weaver
Richard L
RL