交通騷音의 水平ㆍ垂直的 傳達 및 減衰 特性

Abstract

Rapid industrialization and fast population growth in an urban area have reflected on various environmental problems. Especially, traffic noise is becoming one of serious fact to threaten the residents's sound and stable life as the number of automobiles and volume of physical flow is remarkably increasing. The Traffic noise which distress the residents can be classified into road traffic noise and railroad traffic noise. The road traffic noise is occurring consistently and irregularly, while the railroad traffic noise is occurring by a frictional sound intermittently only when a train passes. Though the government has designated the area which is deemed necessary to be regulated as the noise-restricted area in an effort to promote the sound and stable residents' life and announced it, it is currently facing many difficulties in regulating the traffic noise effectively and providing the ideal solution due to the lack of preceding studies and reliable data. In order to protect the residents against traffic noise which probably causes serious damages, a soundproof wall is an alternative solution in general. For this, the effects and any possible problems on such sound-proof wall should be considered in depth, but those research is not enough so far. In general, a soundproof wall should be installed after fully considering the sound-related capability-its capability to absorb sounds and the visual and psychological effects on the residents, so that the most effective soundproof wall with various shapes and materials can be installed. This study has been conducted to achieve those objectives as follows; First, in order to understand the horizontal propagation and attenuation characteristics for the traffic noise, we selected actively developed areas within 100 meters away from the road to measure the level of traffic noise near a road. To measure the noise near a railroad, we selected areas within 100 meters away from the railroad and then selected Saemaul-ho and Mugoongwha-ho as the subject in our experiment. In this way, we analyzed the horizontal propagation and attenuation characteristics for the traffic noise occurring in diversified areas. Second, in order to understand the vertical propagation and attenuation characteristics for the road traffic noise, we measured and analyzed the distributional characteristics of vertical sound-pressure levels on each floor of multi-storied apartment buildings according to changes of traffic load, types and existence or nonexistence of soundproof wall. In case of the railroad traffic noise, we also selected Saemaul-ho and Mugoongwha-ho as the subject in our experiment and we measured and analyzed the different noise levels on each floor of multi-storied apartment buildings from the soundproof wall. Based on the outcome of study, we believe that a computer simulation may be a useful tool to predict the traffic noise accurately if more researches are conducted in many different measurement conditions and accumulated to sufficient data. With the help these data, we will be able to provide an improved solution for controlling the traffic noise more effectively.