چكيده به لاتين
Abstract:
Due to the increasing expansion of the rail industry, travel comfort and safety issue has gained importance. Phenomenon wheel flat is the great defects that can increase to four times the dynamic load exerted on the line. In this project, we did a topic that has been little research on wheelflat. Here is a parametric study of the effect of wheelflat on the wheel and rail stresses. For this, we focus on simulation software. We did this in the time and frequency domains. At the time domain, we use Abaqus software that solves problems using finite element theory. In this software, wheel and rail models were drawn. Then, by simulating real conditions on the contact of wheel and rail, output was extracted in time domain. The parameters examined in this study, train speed, depth of wheel flat and axle load that by the impact of each change separately analyzed. After analysis in the time domain and frequency domain analysis, we used MATLAB software commands and graphs of Discrete Fourier transform of stresses here were obtained using the Fast Fourier Transform, was drawn.
Finally, the results obtained in this case we found that with increasing speed, depth of wheel flat and axle load increases stress levels. This was most evident in the case of each parameter when the input value is raised to the highest level. In the frequency domain also saw in the value of the natural frequency of the wheels and rails, jumps in Discrete Fourier transform values occurs.
Keywords: Wheelflat, wheel and rail stresses, finite element, time and frequency domains, Fast Fourier Transform
