| Summary: | 碩士 === 臺灣大學 === 工程科學及海洋工程學研究所 === 95 === The Taiwan high speed rail started to operate at January 2007, and connects the cities between the south and north parts of west Taiwan. Because of the high speed train speed of 300 Km/hr, the dense population and the uneven ground level in west Taiwan there are 73% of whole line of high speed rail are constructured on the viaducts, which have the almost uniform span bridges, the rails pads with fixed distance, and therefore the travelling train will impact the rails and bridges with particular frequencies. The promotion for the safety of the tracks and trains are considered as the important problems since the railway was built. Recently, the riding comfort and the influence on the enviroment impacted by travelling high speed train have become big issues for rail dynamic problems.
In this thesis, the train model is establishe based on the THSR 700T type train, in which the car body is considered as rigid part, spring and damping element are used for primary and second suspension systems, the bogies are modeled by strong beam element, rail and viaduct are simulated by beam and shell element, respectively. The dynamic characteristic of the train and bridges, are analyzed by modal analysis using ANSYS code. In this paper, we use LS-DYNA to analyze the dynamic response of train, rail, and bridges under travelling train condition. The calculeted acceleration of bridges and rail are transferred to power spectrum density (PSD) to find the singnificant frequencies and their relationship to the nature frequency and modal shape of train and structures.
Finally the ISO-2631 standerd was used to evaluate the riding comfort using the analysis results under different class of track irregularity.
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