• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2003.05a
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• pp.174-177
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• 2003

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.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2002.05a
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• pp.1081-1085
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• 2002

A modeling is developed to predict the isolation performance of sound barrier systems under the sound pressure radiated from excited by point impact. The predicted results are compared with the measured results obtained by using APAMAT II. This instrument provides a combination of structure-borne noise and air-borne noise, which corresponds to rolling noise, by applying the excitation system projected steel balls against the steel sheet.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2001.11b
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• pp.877-881
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• 2001

In this paper, a model is developed that can predict insulation performance of sound barrier systems under the action of multiple random point impact. The predicted results are compared with the measured results obtained by using APAMAT II. The results show the error due to the difference between experimental environment and theoretical assumptions. The model is needed to be improved to obtain better agreement between predicted and measured results.