Simulation of acoustic cavities considering realistic boundary conditions

In this paper a method is presented for modeling sound fields in acoustic cavities. The acoustic cavity can contain acoustic elements such as compound absorbers or resonators. The calculations are performed by dividing the cavity into substructures where each substructure can contain acoustic elements. The coupling of the fluid with the compound absorber is done by using a Component Mode Synthesis, where the fluid component is considered by its normal modes and by constraint modes at the interface. The compound absorber is coupled with the fluid as boundary conditions. Finally, Hamilton’s principle is formulated for the coupled system and the steady state response is calculated for a harmonically oscillating pressure load. The coupling of the fluid and the resonator is performed via the interaction forces at the common interface. For this fluid-structure coupling the mixed formulation of pressure and displacements is used. The application of the method is presented by means of examples.     «

In this paper a method is presented for modeling sound fields in acoustic cavities. The acoustic cavity can contain acoustic elements such as compound absorbers or resonators. The calculations are performed by dividing the cavity into substructures where each substructure can contain acoustic elements. The coupling of the fluid with the compound absorber is done by using a Component Mode Synthesis, where the fluid component is considered by its normal modes and by constraint modes at the interf...     »