Dynamic model method for measuring tunnel air resistance coefficient of high speed train and application thereof

Abstract

The invention discloses a dynamic model method for measuring a tunnel air resistance coefficient of a high speed train and application of the dynamic model method. The dynamic model method comprises the steps of preparing site equipment, collecting data, drawing a speed curve, drawing an acceleration curve and computing the tunnel air resistant coefficient. The main steps are as follows: placing a motor train unit model on a dynamic model experiment platform and enabling the motor train unit model to be connected with an accelerating mechanism; setting a light reflection zone; installing a photoelectric detector; installing a data collecting device; connecting a computer when the motor train unit model is in a stop state; when the motor train unit model runs to a set distance in front of a tunnel entrance at a set primary speed, enabling the motor train unit model to begin to slide freely and pass through the tunnel until the motor train unit model stops; emitting visible light to the light reflection zone and receiving and storing reflection light signals by the photoelectric detector; and drawing the speed curve and the acceleration curve and computing the tunnel air resistance coefficient by placing the quality of the motor train unit model, the speed of the motor train unit model and the acceleration of the motor train unit model into the newton second law formula and the Davis empirical formula.

Description

technical field [0001] The invention relates to a dynamic model method for measuring the air resistance coefficient of a high-speed train tunnel and its application. Background technique [0002] As the speed of the train increases, the resistance of the train continues to increase, and the proportion of air resistance is increasing. Since the train air resistance is proportional to the square of the train speed, when the train speed reaches 200km / h, the train air resistance accounts for about 70% of the total train resistance; when the train speed exceeds 300km / h, it accounts for more than 85%. Therefore, it is a key technical issue in the construction of high-speed railways to improve the aerodynamic performance of trains and achieve drag reduction and energy saving by streamlining the car body. [0003] In the process of developing high-speed railways and developing high-speed trains at home and abroad, a lot of research has been done on the methods of measuring train ai...

AI Technical Summary

Problems solved by technology

However, because it cannot simulate the relative motion between the train, air, ground and tunnel, it is impossible to simulate the process of the train passing through the tunnel in the wind tunnel experiment, and it is impossible to use the wind tunnel to measure the drag coefficient of the train passing through the tunnel.

[0005] Therefore, at present, at home and abroad, there is still no effective experimental means to measure and evaluate the resistance coefficient of trains passing through tunnels at the design stage

Images