نوع مقاله : مقاله پژوهشی
نویسندگان
1 استادیار، دانشکده مهندسی مکانیک، دانشگاه صنعتی اراک، اراک، ایران
2 مهندس ارشد طراحی، شرکت صنایع فولاد درخشان اراک، اراک، ایران
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
Upgrading of the rail vehicles is in line with the policies of the Iran's twenty-year development vision document (Horizon 1404) in order to increase the share of railways in the transportation of goods up to 30%. The design of freight wagons with higher axial load, provides the possibility of increasing the load carrying capacity of the wagons, helps to achieve environmental goals through less CO2 emission, and causes a significant reduction in the transportation cost, which itself leads to more investment by the private sector in the Iran's rail vehicles. This paper presents a computational platform to analyze the mechanical strength of a long-sided freight wagon with an axle load of 25 tons, according to the requirements of EN 12663-2 standard, using the finite element method. Design requirements are described in detail and appropriate numerical models are developed for each requirement. The results of the simulations performed in all loading conditions have been compared with the limits defined in the standard and the correctness of the design has been ensured. Numerical results depict that among all load cases, lifting at one end, lifting the whole vehicle (load cases LC6 and LC7) and compressive force and vertical load (load case LC8) cases are the most sever ones, and induce higher local stresses; which could be reduced by reinforcing or making some geometrical changes in the underframe. In general, the outputs of this research will help the railways engineers to identify and optimize the high stress regions of the freight wagon underframe, under different loading conditions. Such modifications, not only optimize the weight and increase the strength and the load carrying capacity of the wagon, but also increase its useful life time and operational reliability.
کلیدواژهها [English]