Tuning of Estimated Sound Absorption Coefficient of Materials of Reverberation Room Method

Acoustical materials are usually used for architectural design, ambient noise, and traffic noise to absorb sound. The sound absorption coefficient (SAC) is often as the performance index of acoustical materials. It measured using reverberation room method (RRM) impedance tube (ITM). source RRM a random incidence in various directions, whereas that ITM normal incident. SAC by more extensive, practical, costly than ITM. Usually, commercially available index. However, requires large-area test samples measurement special field experiments. Therefore, this study aims use measure SAC. SAC, frequency, thickness, material density were employed independent variables substituted obtained multiple regression model predict RRM. In addition, characteristics tubes provide varisized calibers different frequency ranges relatively accurate Based on abovementioned characteristics, proposed dual-model estimating achieve best-estimated result. After experimental validation, estimated result was compared with from method. observed maximum absolute value all errors did not exceed 0.16. Most below 0.1, proving accuracy can shorten development schedule manufacturers save cost process.