軌道車實作與轉向架銲接殘留應力分析

Fabrication of a Railway Vehicle and Welding Residual Stress Analysis of a Bogie Frame

蕭弘岳(Siao Hong-Yue)

指導教授 ： 陳勇全

國立屏東科技大學/工學院/車輛工程系所/碩士(2018年)

https://doi.org/10.6346/THE.NPUST.VE.019.2018.E07

摘要

本文主要是軌道車之實作與轉向架銲接殘留應力分析。首先，利用三維熱彈塑性有限元素模型來模擬銲接試片之溫升及變形，並以雙橢球熱源模型來模擬銲接熱源。本文也進行三種試片之銲接實驗，量測銲接試片之溫度變化及變形情況，並作為本文所提有限元素模型準確性之驗證。另外，本研究也利用田口法來進行銲接參數最佳化之分析，目標是使銲接殘留應力達到最小。探討的銲接參數包括電壓、電流及速度。分析結果顯示，本文所提出之三維熱彈塑性有限元素模型所得溫升及變形結果，與實驗結果之趨勢相同，誤差小於10%。此外，結果顯示，利用田口法進行銲接參數殘留應力分析，最佳化銲接參數所得結果比原始銲接參數所得結果減少約10%。
軌道車實作部分，完成側框架及軸承箱之銲接，以及輪對、煞車系統、懸吊系統、動力系統及控制系統等之組裝。最後，並進行轉向架軌道動態測試，依據測試結果，提出設計修改。

關鍵字

轉向架 ； 雙橢球熱源模型 ； 殘留應力 ； 田口法 ； 銲接參數

並列摘要

In this thesis, a railway vehicle is fabricated and the welding residual stress analysis of a bogie frame is proposed. Firstly, a three-dimensional thermo-elastic-plastic finite element model is proposed to simulate the temperature rise and deformation of the welding test pieces. The double ellipsoid heat source model is used to simulate the welding heat source. The experiment of three welding test pieces is also carried out to measure the temperature rise and deformation. The results are used as the verification of the accuracy of the proposed finite element model in this paper.
In addition, the Taguchi method is used for the optimization of welding parameters with the goal of minimizing welding residual stress. The welding parameters discussed include voltage, current and speed. The results show that the temperature rise and deformation obtained from the proposed three-dimensional thermo-elastic-plastic finite element model have the same trend as the experimental results. The difference is less than 10%. In addition, the results indicate that the residual stress obtained from the optimized welding parameters can be reduced by about 10% compared with the results obtained from the original welding parameters.
About the fabrication of the railway vehicle, this study has completed the welding of the side frame and axle box, the assembly of wheelset, braking system, suspension system, power system and control system. Finally, the dynamic test of the bogie is performed on test track. Based on the test results, design modifications are also proposed.

並列關鍵字

Bogie ； Welding residual Stress ； Double ellipsoid heat source model ； Taguchi method ； Welding Parameter

參考文獻

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