Time Domain Prediction of a Microperforated Plate Absorber Using the Finite Element Based Numerical Model
There is an increasing number of applications that requires using the time-dependent analysis of finite amplitude acoustic wave propagation or nonlinear acoustics. This study investigates an efficient finite element based numerical model of microperforated plate absorber using the time domain approach. The presented numerical simulation was generated using the Acoustics Module (Pressure Acoustics, Transient manually coupled with Laminar Flow) within COMSOL Multiphysics® 5.4. A time-dependent study with a parametric frequency sweep is applied to the numerical model and the calculation for the absorption coefficient is performed as an integration of a time-dependent expression over a time interval. The time domain prediction is compared with analytical, frequency domain and experimental results, and demonstrates strong agreement. Therefore, this time domain modelling approach can be efficiently used with confidence to simulate nonlinear problems where frequency domain analysis is not suitable.
