抄録
This research is concerned with the development of new method of acoustic transmission loss (TL) of panels. The conventional TL estimation method needs a big facility which includes a pair of acoustic reverberation rooms. This method has some problems as follows; (1) These kind of experimental facility is very rare so one cannot keep enough time for experiments. (2) Panel size is limited. (3) Measured results are affected by the panel size, panel setting method, so on. (4) The conditions under which panels are used are different from the conditions in the experiments and this difference sometimes makes large discrepancies. Considering these subjects, the new method are studied which does not need the acoustic rooms and reflect the conditions under which panels are used. This method uses the experimental modal analysis which needs the impact hammering data. At first, theoretical research was executed based on statistical vibration analysis with the modeling of acoustic defuse field. Numerical studies were done and results of this method showed nice coincidence with the conventional method based on the plane wave modeling of acoustic field. In the next step, experimental validation was conducted; proposed method was applied to the simply supported aluminum panel. In the frequency range below 1KHz, the results showed good coincidence with the data on the literature. Based on these results it was achieved that the proposed method is accurate and practical.
