Study on calculation method of air resistance of high-speed monorail sled

Abstract

Two different methods are used to calculate the air resistance of high-speed monorail pulley. The calculation of rocket sled Air Drag Coefficient is the key technology to realize rocket sled trajectory accurate control. The commonly used methods for calculating the Aerodynamic Drag Coefficient of rocket sled are the wind tunnel test method and the sled integral decomposition method. In Wind Tunnel Test, the wind tunnel wall influence, the test result error is big. The whole decomposition method is simple and the settlement result is more accurate. Firstly, the relationship between the pulley speed and the air drag coefficient is obtained by discretizing the measured air drag coefficient curve. Then, the wind resistance coefficient of the high-speed monorail pulley is calculated by the whole decomposition method. At last, the air resistance of pulley under different wind speed is calculated by finite element method. Compared with the finite element method, the error of the whole decomposition method is less than 10% . When the air resistance coefficient of the pulley increases by 0.02, the maximum speed of the pulley decreases by 30m/s, which provides a basis for the design of the high-speed monorail pulley. This method provides technical support for the design of high-speed monorail train, and calculates the wind resistance coefficient of the pulley by using the integral decomposition method and the finite element simulation method