Experimental Investigation of the Use of Equivalent Sources Model in Room Acoustics Simulations

摘要

As an alternative to models based on geometrical acoustics and the computationally intensive Finite Element or Boundary Element methods, the Equivalent Sources Model (ESM) has recently been modified and extended from its original application in acoustical holography to room acoustics simulations. Previous numerical simulation results have demonstrated the advantages of room acoustics ESM's (especially when higher order sources are used as its equivalent sources) as a flexible reduced order modeling procedure in room acoustics. In the present work, an experimental investigation of the room acoustics ESM was conducted in which the sound field generated by a loudspeaker in a small room was measured. The ESM prediction of total sound field in the room is calculated by coupling a free-space ESM (which gives the source information) with a room acoustics ESM (to account for the room effect). The ESM predictions are compared with the measurements to show the validity of the room acoustics ESM in a realistic application.