Railway vehicle telescopic head and railway vehicle

Abstract

A telescoping railway vehicle head and railway vehicle, the head comprising: a telescoping front end (1) of the head, a head body (4) behind, and an internal telescoping frame (3). The telescoping front end (1) of the head comprises multiple centipede-like unit sections (1a, 1b, 1c, 1d, 1e, 1f, 1g) connected in a head-to-tail manner and corresponding connecting rods (2a, 2b, 2c, 2d, 2e, 2f, 2g) fixedly disposed in the unit sections (1a, 1b, 1c, 1d, 1e, 1f, 1g). The telescoping frame (3) comprises several swing rods (3a) and swing shafts (3b), the swing rods (3a) are rotationally connected in a head-to-tail manner via the swing shafts (3b) to form a telescoping diamond-shaped frame in the longitudinal direction of the head. The telescoping frame (3) drives the connecting rods (2a, 2b, 2c, 2d, 2e, 2f, 2g) together with the centipede-like unit sections (1a, 1b, 1c, 1d, 1e, 1f, 1g) to shift back and forth in the longitudinal direction of the head, thus changing the aerodynamic resistance of the head by driving the telescoping front end (1) of the head. A railway vehicle comprises a vehicle body, and telescoping heads connected to the front and back of the vehicle body. The combined aerodynamic resistance of the front and the back is changed by driving the telescoping front end (1) of the head at the front and the back of the vehicle body.

Description

technical field [0001] The invention relates to rail vehicle technology, in particular to a rail vehicle retractable head and a rail vehicle. Background technique [0002] With the continuous improvement of the speed of rail vehicles, especially the EMU, the resistance of the EMU will increase significantly. When the speed of the EMU reaches 200km / h, the air resistance accounts for about 70% of the total running resistance. When the speed of the EMU reaches 300km / h h, the air resistance accounts for about 85% of the total running resistance, and most of the energy consumed in the operation of the EMU is used to overcome the air resistance. [0003] The research shows that the relationship between the aerodynamic performance and the main shape parameters of the head shape, including the length of the streamlined head, the variation of the main shape of the longitudinal section, the variation of the main shape of the horizontal plane, and the maximum cross-sectional area; the ...

AI Technical Summary

Problems solved by technology

[0005] "Vehicles and Power Technology" 2005, No. 3, P12; Authors: Kang Ning, Qiao Junping "Research on the influence of wake vortex characteristics on the aerodynamic drag of cars" used the commercial CFD software STAR-CD to study the external flow fields of two car models According to the numerical simulation, according to the velocity vector diagram and the three-dimensional streamline diagram, it can be clearly seen that at the rear of the car, the airflow has separated, forming two pairs of upper and lower vortices with a larger size, and finally merged together and extended to the wake; The tail vortex of the hatchback model is looser and dissipates faster at the rear of the body, while the tail vortex of the fastback model is tighter. Extended, it exists within a long distance at the rear of the car body. It is precisely because of the strong wake vortex that the aerodynamic resistance of the fastback car is relatively large.

Images