於近年來，軌道系統發展風起雲湧，各城市皆計畫以軌道系統羅織城市交通網絡，以改善汽機車所帶來之能源問題及都市交通壅塞。然而，新的發展通常帶來新的問題，其中伴隨軌道系統於城市之中架設，運行噪音對日常生活之影響，亦成為一不可忽視之課題。
　　本研究利用聲輻射比及聲臨界輻射頻率之概念，建立噪音預測模型。利用鋼軌振動量測所得之振動加速度，進行數值運算，進行鋼軌振動所發出噪音之預測。另外，於軌道旁進行軌道系統之噪音量測，將收集之量測數據與預測數據進行比對，驗證預測模型之預測效能。
　　從頻率域圖來看，可發現預測模型及量測試驗中，兩者高頻噪音皆比其他頻率噪音之聲壓位準來得更高，儘管預測模型因僅進行鋼軌振動所產生之噪音進行預測，使得低頻噪音與實際有所落差。但在高頻噪音之預測與量測試驗所得差距不大，驗證此預測模型之於軌道系統噪音預測有其參考價值。

Railway systems have been favored to resolve mass transportation and urban pollution in the coming urbanization era. The conflict between railway noise and accessibility of transit systems calls for desperate needs of studies on railway noise. The noise prediction model of a moving train was programed based on comprehensive literature review. The sound level at any distance from the railway centerline can be estimated with the rail vibration data. The prediction model was further validated with field measured data of rail vibration and wayside noise. Comparisons of frequency spectrums of measured and predicted noise show fairly close sound levels in high frequency range, yet noticeably discrepancies in low frequency range. The causes of disagreement were discussed and the feasibility of the prediction model was also assessed in this study.

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