System and method for testing aerodynamic characteristic of high-speed moving vehicle-bridge system and subsidiary facilities thereof under crosswind

Patent metadata

Field	Value
Publication number	US-11199471-B2
Application number	US-202016923121-A
Country	US
Kind code	B2
Filing date	Jul 8, 2020
Priority date	May 8, 2018
Publication date	Dec 14, 2021
Grant date	Dec 14, 2021

Abstract

A system for testing aerodynamic characteristics of a high-speed moving vehicle-bridge system and subsidiary facilities thereof under a crosswind includes a vehicle model, a starting mechanism, a buffer mechanism, a wind tunnel test section and guide rails. The guide rails pass through the wind tunnel test section; the starting mechanism and the buffer mechanism are separately located at both ends of the guide rails. The guide rails include an acceleration section and a deceleration section. The starting mechanism is located in the acceleration section, and the buffer mechanism is located in the deceleration section; the vehicle model starts to run at the starting mechanism and stops at the buffer mechanism; an instantaneous speed of the vehicle model in the acceleration section is not less than 100 km/h. The present invention carries out simulation tests on various infrastructures, their subsidiary facilities and trains through scale models.

First claim

What is claimed is:

1. A system for testing aerodynamic characteristics of a high-speed moving vehicle-bridge system and subsidiary facilities of the high-speed moving vehicle-bridge system under a crosswind, comprising a vehicle model, a starting mechanism, a buffer mechanism, a wind tunnel test section and guide rails, wherein
the guide rails pass through the wind tunnel test section; the starting mechanism and the buffer mechanism are separately located at both ends of the guide rails;
the guide rails comprise an acceleration section and a deceleration section; the starting mechanism is located in the acceleration section, and the buffer mechanism is located in the deceleration section; the vehicle model starts to run at the starting mechanism and stops at the buffer mechanism; and
an instantaneous speed of the vehicle model in the acceleration section is not less than 100 km/h; wherein,
the buffer mechanism comprises a flexible buffer plate and a buffer block; the buffer block is fixed to the other end of the guide rails; and the flexible buffer plate is provided on an outer wall of the buffer block.

2. The system according to claim 1 , wherein the starting mechanism comprises a high-speed servo motor, rotating pulleys, an external toothed thrust plate and a high-strength rotating conveyor belt; wherein,
a high-strength rotating conveyor belt is wound on the rotating pulleys; the high-speed servo motor is connected to the rotating pulleys and drives the high-strength rotating conveyor belt to rotate through the rotating pulleys; and
a first end of the external toothed thrust plate is provided on the high-strength rotating conveyor belt and rotates synchronously with the high-strength rotating conveyor belt, and a second end of the external toothed thrust plate is inserted into the vehicle model.

3. The system according to claim 2 , wherein the starting mechanism comprises at least two rotating pulleys; the high-strength rotating conveyor belt is ring-shaped and tightened by the rotating pulleys; and the high-speed servo motor is connected to a drive rotating pulley of the at least two rotating pulleys and drives the high-strength rotating conveyor belt to rotate through the drive rotating pulley.

4. The system according to claim 1 , wherein the starting mechanism comprises a compression ejection component and an ejection portion; wherein,
the compression ejection component is configured to compress the vehicle model on the ejection portion and then is configured to release the vehicle model to run along the guide rails;
the ejection portion comprises a spring, a fixed plate and an ejection plate; wherein the fixed plate is fixed to one end of the guide rails, and the ejection plate is provided at a rear end of the vehicle model; the spring is clamped between the fixed plate and the ejection plate;
the compression ejection component comprises a hook block, a lead screw and a motor; the hook block is fixedly connected to a bottom surface of the vehicle model; the motor is connected to the lead screw in a drive manner; the lead screw rotates around an axis of the lead screw; the lead screw is fixedly connected to a hook plate; the hook plate compresses the ejection portion with the rotation of the lead screw; and the hook block is telescopically clamped on the hook plate.

5. The system according to claim 1 , wherein the buffer mechanism further comprises a clamping slot; the clamping slot is provided in front of the buffer block and recessed into the guide rails; a clamping block is provided on a bottom surface of the vehicle model, and the clamping block is telescopically clamped with the clamping slot.

6. The system according to claim 1 , further comprising a test bridge span model; the guide rails are laid on the test bridge span model, and the test bridge span model passes through the wind tunnel test section.

7. The system according to claim 6 , further comprising two support frames; the two support frames are installed on a bottom surface of the test bridge span model; the two support frames are located on two outer sides of the wind tunnel test section; and the two support frames are connected to external track support frames through a snap-on component, and are electromagnetically attached to the ground of a wind tunnel.

8. The system according to claim 1 , wherein the vehicle model comprises a vehicle model housing, a model structure support girder, model structure support crossbeams, model dynamic pulleys, a dynamic pulley connecting rod and anti-derailing/rail holding devices; wherein
the model structure support girder and the model structure support crossbeams are interlaced to form a frame structure of the vehicle model; the vehicle model housing is located outside the frame structure; pairs of model dynamic pulleys are provided at the bottom of the frame structure; the pairs of model dynamic pulleys are connected by the dynamic pulley connecting rod; the frame structure is provided with the anti-derailing/rail holding devices; the anti-derailing/rail holding devices are provided on an outer contour of the guide rails and are spaced from the guide rails; the model dynamic pulleys are engaged on the guide rails and can move on the guide rails along an axial direction thereof; the starting mechanism rests on the model structure support girder and provides initial motion power to the model structure support girder.

9. The system according to claim 1 , wherein the vehicle model comprises a first vehicle model and a second vehicle model; the starting mechanism comprises a first starting mechanism and a second starting mechanism; the buffer mechanism comprises a first buffer mechanism and a second buffer mechanism; the wind tunnel test section comprises a first wind tunnel test section and a second wind tunnel test section; the guide rails comprise first guide rails and second guide rails; the first guide rails comprise a first acceleration section and a first deceleration section; the first starting mechanism is located in the first acceleration section, and the first buffer mechanism is located in the first deceleration section; the second guide rails comprise a second acceleration section and a second deceleration section; the second starting mechanism is located in the second acceleration section, and the second buffer mechanism is located in the second deceleration section; the first guide rails and the second guide rails are spaced apart side by side; the first guide rails pass through the first wind tunnel test section, and the second guide rails pass through the second wind tunnel test section; the first wind tunnel test section and the second wind tunnel test section are spaced apart side by side in the same wind tunnel; the first starting mechanism and the first buffer mechanism are respectively provided at a first end and a second end of the first guide rails; the second starting mechanism and the second buffer mechanism are respectively provided at a second end and a first end of the second guide rails; the first vehicle model runs along the first guide rails, and the second vehicle model runs along the second guide rails.

10. The system according to claim 1 , wherein the wind tunnel test section is provided with photoelectric sensors to measure a speed of the vehicle model; four photoelectric sensors are arranged on each side wall of the wind tunnel test section; each two photoelectric sensor of the photoelectric sensors are spaced by 0.5 m; a speed of the crosswind in the wind tunnel test section is 0-20 m/s.

11. A test method for implementing the system according to claim 1 , comprising the following steps:
S 100 : placing the vehicle model on the starting mechanism, and driving th

Assignees

• Univ Central South
• National Engineering Laboratory For Construction Tech Of High Speed Railway

Inventors

• He Xuhui
• Zou Simin
• Wang Hanfeng

Classifications

• G01P3/36

  Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light (G01P3/68 takes precedence; gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams G01C19/64) · CPC title

• G01M9/06

  Measuring arrangements specially adapted for aerodynamic testing · CPC title

• G01M9/02 Primary

  Wind tunnels · CPC title

• G01M9/08

  Aerodynamic models · CPC title

• G01M9/04 Primary

  Details · CPC title