近幾年各大都會區皆以建置舒適便捷的捷運系統為施政目標，並已成為先進都市發展的趨勢及指標。捷運系統因班次密集、準點率高，在輸運能力上展現極高效率，並可有效抒解都會區繁忙的交通狀況，同時可降低污染，節省能源使用，因此受到市民大眾廣泛使用，提升並可帶動城市大眾運輸使用率。捷運系統雖有上述優點，但系統營運時產生的振動及噪音可能對周遭的建物或設施造成干擾，輕則造成人體心理及生理上的影響與不適，重則引起結構物的共振及機電設備之異常。因此近幾年捷運系統的興建已將減振降噪相關措施納入設計考量。
高雄捷運紅橘線路網於97年9月全線通車營運，讓高雄市民享受捷運系統所帶來的舒適與便利，但仍不可豁免要面對振動及噪音的問題。本研究於高雄捷運高架路段進行列車振動現地量測，並與高鐵及台鐵振動量測結果比較。另於台鐵及高雄捷運列車上量測列車振動情形，以了解各系統列車運行之振動特性。

Planning and providing a comfortable and convenient MRT system becomes a trend and target to the metropolitan development in Taiwan in recent years. The MRT system has many advantages such as short headway, punctual, efficient, economical and environmental friendly. But the most confusing problem of the MRT system is the influence of the noise and vibration to the adjacent area, which was caused by the train moving on the track. The vibration may cause resonanting of the building and operating abnormally to the equipments in the adjacent area. In order to reduce the noise and the vibration, some mitigation measures have been considered during the track design stage in recent years.
Kaohsiung MRT project had been completed at September, 2008. It brings comfort and convenience to Kaohsiung citizens, but still has to face the problem of noise and vibration. This study used the field experiment to measure the vibration of elevated bridges of Kaohsiung MRT system. And comparied with the measuring result of high-speed railway and Taiwan railway. Besides, experiments in the train of Taiwan railway and Kaohsiung MRT system are also performed. So we can understand the characteristics and the influence of the vibration in these systems when the train moving on the track.

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