소음 발생원별 교사 내 실내 소음 예측기법 및 평가방법에 관한 연구 - 도로, 철도 소음을 중심으로-
A Study on Indoor Noise Prediction Methods and Evaluation Techniques in Classrooms According to Noise Sources – Focusing on Road and Railway Noise -
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초록
교사내소음영향을미치는소음은도로및철도소음을포함하며, 각음원의음향특성(주파수대역별음의높낮이등)에따라실외에서실내로전달된다. 본연구에서는실외소음이실내로전파될때전달특성의주된영향인자가실내흡음률과창호개구부면적이라고가정하였으며, 도로교통소음을대상으로실외·실내실측값과시뮬레이션을통한예측값을서로비교하여실내전달특성에대한예측기법의적정성을검토하였다. 실측데이터와예측결과의비교를통해면음원모델이점음원모델대비탁월한성능을확인하였으며, 예측오차가평균±1 dB(A) 이내로분포하는것으로나타났다. 도로및철도소음의교사내평균전달계수가-8.0, -8.2dB(A)로나타났으며, 두소음원이유사한음향특성을갖는것에기인한것으로판단된다. 본연구의결과는향후신설학교계획시환경영향평가및교육환경평가(기존학교포함)에활용될수있는유용한자료로사용될것으로기대된다.
Abstract
This study investigates the transmission characteristics of outdoor noise into indoor Using road traffic noise as the baseline, both field measurements and simulation-based predictionswere conducted to evaluate the reliability of indoor noise transmission prediction methods. Resultsshowed that the line source model demonstrated superior predictive performance compared to thepoint source model, with prediction errors remaining within ±1 dB(A) on average. The averageindoor transmission coefficients for road and railway noise were -8.0 and -8.2 dB(A), respectively,attributed to the similar acoustic characteristics of both sources. The findings of this study provide a validated predictive framework that may serve as a usefulreference for environmental impact assessments and educational environment evaluations(includingexisting schools) in the planning of new school facilities. classroom environments, with a focus on road and railway noise. Since each noise source exhibitsdistinct acoustic properties-such as differences in frequency spectrum and sound pressure level-thepropagation of sound from outdoor to indoor spaces varies accordingly. In this research assumes thatthe primary factors influencing indoor noise levels are the indoor sound absorption rate and the areaof window and opening surfaces.