| The pressure wave that produced by the train through the tunnel can affect the comfortable degree of the passenger. The passenger may feel a drumming in the ears or pain on the eardrum. At the same the pressure wave can produce a acuity aerodynamic load which act on the equipment in the tunnel that could produce the fatigue destroy which could effect the using life of the equipment and the travelling safe serious. On the other hand, the train body could be attainted when it is strike by the aerodynamic load. There are many tunnels in our country, the proportion of the very long tunnel changed more and more in all of the tunnels which constructed in these years. For the requirement of the development in different areas and the limit of the geography condition in our country, the construction of the very long tunnel on high altitude region must develop ceaseless. So it is very signification to study the variety rule and distribution characteristic of the aerodynamic load in the very long tunnel on high altitude region.The object of study is GuanJiao tunnel which is seated at the railway from Xining to Ge Ermu in this text. The one dimensional unsteady compressible non-hometropic flow model and method of characteristics of generalized Riemann Variables are used to simulate the pressure wave in the tunnel, and taking a studying for the characteristic in the time area of the transverse and lengthways aerodynamic load. Based on the theory of Fourier transformation and the math software of MATLAB, the characteristic in the frequency area of the transverse and lengthways aerodynamic load at the design velocity is studied. And at the same time the character of the affect of different velocity to the transverse and lengthways aerodynamic load is studied.On the other hand, there is a research for the time area and frequency area characteristic of the inner and the outer aerodynamic load of the carriage and the pressure difference of the inner and outer of the carriage. As an example by the first carriage, middle carriage and the last carriage, for getting the variety and the distributing rule in the time area and frequency area of the aerodynamic load inner the carriage outer the carriage and the pressure difference of the inner and outer of the carriage at the designed velocity. At the same time get the character of the affect of different velocity to aerodynamic load of the carriage is studied.Though the study introduced above, there is an accidence comprehension for the characteristic of the aerodynamic load in the very long tunnel on high altitude region and establishing a foundation for the study of the comfortable degree of the passenger and the fatigue life of the equipment in the tunnel and the fatigue design for the carriage. |
