新型钢岔枕结构设计及力学特性研究OA北大核心

Firstly,the application and research of steel switch sleeper are introduced,a series of problems in the application of existing steel switch sleeper are proposed,and a new type of steel switch sleeper with integral casting type is designed.The new steel switch sleeper material adopts QT400-18 and its section size is comparable to that of ordinary concrete sleeper,which does not affect the tamping of the large machine.Subsequently,the torsional vibration mode with main vibration frequency of 127.4 Hz and 130.9 Hz and bending vibration mode with main vibration frequency of 169.7 Hz are calculated and proposed for the new steel switch sleeper,and other high-frequency vibration modes mainly come from the vibration deformation of the free end at the top of its sidewall.Finally,in order to study the force and deformation characteristics of the new steel sleeper in practical application,the static model of the new steel sleeper in practical application is established by using the finite element method,and on this basis,the influences of the axle load,passing speed and stiffness of the lower bed of the steel sleeper on its own force and vertical displacement value are studied.According to the calculation:the strength of the new steel sleeper meets the requirements,and the self-deformation is small;when the axle load of the train is 17 t and the passing speed is 80 km/h,the maximum equivalence force of the new steel sleeper is 64.4 MPa,the maximum vertical displacement of the top surface of the rail head is 1.42 mm,and the maximum vertical displacement of the new steel sleeper is 1.36 mm;when the passing speed is only increased to 120 km/h,the force of the new steel sleeper is increased by 16.7％and the displacement index is increased by 16.2％;when the axle load of the train is only increased to 29t,the force of the new steel sleeper is increased by 71.3％,and the displacement index is increased by 71.1％;when the stiffness of the bottom track bed is increased by 1 time,the force of the new steel sleeper is increased by 22.5％,and the displacement index is decreased by 12.7％.