간이 차음시험장치(APAMAT II)와 잔향실 차음성능의 비교

Comparison of Sound Insulation Performance between a Simplified Test Apparatus(APAMAT II) and the Reverberation Chamber

Comparisons of measuring apparatus for sound insulation are made between a reverberation chamber and a simplified test apparatus(APAMAT II) that is used to measure sound insulation performance of inner panels for automobiles. Also, theoretical prediction by using sandwich model are made in order to compare it with experiments and to consequently provide a design tool. Comparative results show that steel ball excitation in APAMAT II has a serious problem with sound insulation performance at the low frequency region, while speaker excitation gives a good agreements with theoretical prediction.