Study On The Fuzzy Evaluation Of Comfort Based On The Research Of The Aerodynamic Effect Of High-Speed Railway Tunnel

With the train increasing speed, the aerodynamics effects become more and more important when train entering a tunnel. The obvious pressure fluctuation will be caused in tunnel and micro-pressure wave will radiated from the exit of the tunnel, which will influence passengers' comfort and environment around a tunnel. It is necessary for the attraction of the railage to enhancing the comfort in the train. Theorizing of pressure comfort criteria is indispensable to providing the design of vehicle and tunnel with gist and parameter.The thesis relies on the item of technology development project of China Railway Eryuan Engineering Group Co.Ltd for the studying on the aerodynamic feature of high-speed train passing through tunnel with mid-station by Southwest Jiaotong University. The models of the fuzzy synthetical judgement based on the fuzzy theory and model experiments and numerical simulation were adopted on the study. High-speed train model experiment table is adopted on the study. According to reseach of aerodynamic action mechanism and optimize measure to establish three-dimensional unsteady viscous compressible non-homentropic flow model to simulate with FLUENT. The main contents of the thesis are as follows:Firstly, the comfort criterion existed are reviewed and evaluated in detail, and the disadvantage are elicited consequently. It is suggested to improve the existed method.Secondly, based on the fuzzy theory, the models of the the fuzzy evaluation of comfort are set up, the way to determine the rank vector of indicator of comfort is presented; the grade of comfort is ascertain by the theoretics of non-symmetric closeness degree.Thirdly, the pressure equation of the train interior is simplified, the aerodynamic effect of interior train of the different sealing parameter and velocity are compared;Finally, when high-speed train goes through tunnel with mid-station, the comfort of the train and tunnel and station are judged; the measure to heighten the grade of comfort is put forward; the best measure is ascertained by model experiment; the comfort heightened in the train and tunnel and station are judged and analyzed.