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In "the Environmental Quality Standards for Noise," the problem of environmental noise in areas facing roads is evaluated by obtaining the numbers and the rates of the buildings at which noise levels ...exceed the environmental quality standards. In order to estimate noise distribution in the residential area facing roads, it is necessary to grasp the insertion loss caused by the buildings. The authors proposed in the previous study a simple method to predict the insertion loss of road traffic noise caused by detached houses in case of an area facing a dense asphalt paved road. However, there are lots of residential areas facing the drainage asphalt paved road. Since the frequency characteristics of road traffic noise between dense asphalt pavement and drainage asphalt pavement are different, it is expected that the insertion loss by the buildings changes. The purpose of this paper is to derive a new method to predict the insertion loss of road traffic noise caused by detached houses in case of an area facing a drainage asphalt paved road. A one-twentieth scale model experiment is performed. On the basis of the experimental results, to extend the authors' previous predicting method to be applicable in case of an area facing a drainage asphalt paved road is examined, and then a simple procedure to compensate the change of noise level caused by the difference of the frequency characteristic is derived. The results of an additional experiment verify the validity of the proposed method.show more
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jaud22_p085