本研究的目的為當列車行經於基礎沉陷之路堤時，評估該列車的安全性。論文包含有限元素法模擬與列車振動量測實驗，並對行車安全性提出建議。
藉由建立高速列車與路堤的有限元素模型，來模擬實際行駛狀況。其中，列車模型包含輪元素、彈簧阻尼元素、集中質量，以及考慮剛性連結等影響。使用紐馬克直接積分法用於求解列車行經路堤的之模擬。在列車脫軌分析中，以脫軌係數用來評估列車行經不平整軌道時的脫軌行為。除此之外，另使用加速度規量測臺灣高鐵列車上的振動行為，並用1/3八音階頻帶法來計算振動dB值。
由分析結果顯示，當高鐵行經路堤結構時，其dB值高於當列車行經其他結構體的dB值，代表路堤上之軌道不整度較為嚴重，日後需持續監測。當列車行經因基礎沉陷的路堤結構時，降低車速能有效改善安全性並防止脫軌。另外，當脫軌情況發生時，通常會先從列車的前後第一節車廂下之輪子開始發生。相同的沉陷量下，較平順的軌道其脫軌係數會小於較不平整的軌道。

The purpose of this article attempts to evaluate the safety when high speed trains moving on embankments due to foundation settlement. In order to propose some useful suggestions for improvements in safety, this research involves both simulation and experiment analysis.
Models for a high speed train and an embankment with foundation settlement were established. The train model consisted of wheel element, spring damper, and lump mass in a finite element analysis and the rigid link effect between mass centers was also considered. The Newmark method was applied for direct integration analysis to obtain response solutions. Derailment coefficient was used to provide a useful reference to evaluate the derailment behavior of trains. A vibration experiment was conducted on a moving train of Taiwan High Speed Train (THSR). One-third octave band was performed for calculating dB values of vibrations measured on THSR moving trains.
The data show that dB values obtained from embankments are higher than others in the different structural types along the THSR track, which indicates that track irregularity on embankments is more obvious and worthy of notice. Decreasing the speed of trains is a useful approach to make sure that the train would not derail. The derailment behavior of wheels often occur under the first and the last carriage of moving trains. Smoother rail track can decrease the derailment coefficient make the train safer.

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