Research on a noise control device. (5th report The noise reduction effect of application to a machine and its prediction method by a scale model experiment)

The principle of the noise control device and its design methods were described in the previous reports, and it was indicated that a great noise reduction can be obtained when the noise control device with an appropriate barrier, that is, the noise control device system was used. Before the noise control device system is applied to a real noise source, for example, a machine noise, a traffic noise, etc., it is necessary to estimate the noise reduction effect. For this purpose, the noise reduction effect of application to a machine noise was measured and its prediction method by a scale model experiment was considered. In this paper, the noise reduction effect of application to a real noise source and its prediction method are described.