Abstract
In the paper, we propose a concentrated mass model to perform a two-dimensional acoustic analysis. This model consists of masses, connecting springs, connecting dampers, and base support dampers. The characteristic of connecting spring is derived from the condition of adiabatic change of air, and the equivalent mass and the equivalent damping coefficient of the base support damper are derived from the shear stress from the wall. To confirm the validity of the proposed model, the numerical results obtained by the concentrated mass model are compared with the theoretical value of traveling wave, and with the theoretical value of the natural frequency. All numerical computational results agree very well with the theoretical values. Therefore, it is concluded that the proposed model is valid for the two-dimensional acoustic analysis.
