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

Sound radiation and suppression of an unbaffled long enclosure using Helmholtz resonators

“…8, the radiation patterns of the zeroth to fifth modes at 340 Hz are not symmetric about the centerline of the opening, as demonstrated in Ref. [36]. However, the radiated acoustic modes from the opening tend to propagate upward due to the ground reflection.…”

“…Alternatively, FEM-based hybrid methods introduced in Refs. [22][23][24]36] can be used to attain the near-field results.…”