以ANSYS研究軌道車輛地板結構之防火測試

Study on the Fire Resistance Test of Train Floor Structure by Using ANSYS

10.29688/MHJ.201102.0002

呂鴻猷(Hung-Yu Lu)；許文宏(Wen-Hung Hsu)

有限元素分析 ； ANSYS ； APDL ； 軌道車輛地板結構 ； 防火測試 ； finite element analysis ； ANSYS ； APDL ； train floor structure ； fire resistance test

明新學報

37卷1期（2011 / 02 / 01）

15 - 27

繁體中文

本研究係以ANSYS有限元素分析軟體，研究軌道車輛地板結構之防火測試。研究之對象為台鐵空調通勤電聯車組之第四節車廂地板結構，並依據台鐵電聯車規範TRAS(M)-970296進行防火測試模擬。文中採用ANSYS之APDL參數化語言，以便快速建立有限元素模型，正確施加熱傳分析之負載與邊界，並運用程式優勢，在暫態求解過程中，允許空氣密度、動黏度等參數以及熱對流係數之更新，以獲取較精準之結果。分析結果顯示地板表面之最高溫度為82.13℃，平均溫度為51.74℃，符合台鐵空調通勤電聯車規範之要求。研究亦發現，元素尺寸、自然對流係數之更新頻率、積分運算之步階數，對溫度皆有收斂之影響。當元素尺寸縮小、自然對流係數之更新次數增加以及積分步階次數增加時，皆可以使溫度向下收斂，但也使節點數量增加，運算時間增長。

The fire resistance test of train floor structure is studied by using ANSYS in this research. The object of fire resistance test simulation is the floor structure of the fourth car of commute train set, and following the code TRAS(M)-970296 ruled by Taiwan Railways Administration. ANSYS parametric design language (APDL) is used in the research in order to create finite element model quickly, apply loads and boundary conditions of thermal analysis correctly, and allowed to renew the thermal conductivity of air, dynamic viscosity and coefficient of heat transfer during transient solution procedure due to the advantage of parametric program. The results show that the maximum floor temperature is 82.13℃ and the average floor temperature is 51.74℃ which meet the requirement of the code. It has also been found that element size, the frequency of renewing coefficient of heat transfer and number of substeps of integration affects the temperature convergent. As element size is decreased, frequency of renewing coefficient of heat transfer or number of substeps of integration is increased temperature converges to a lower value. However, it also increases the computing time due to increased nodes.

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