Total-degrees-of-freedom movement-based wind tunnel test device for vehicle on bridge

Abstract

A total-degrees-of-freedom movement-based wind tunnel test device for a vehicle on a bridge, comprising a model body (1), a force measuring assembly, a longitudinal moving assembly, and a transverse moving assembly. The longitudinal moving assembly comprises longitudinal movement wheels (2) arranged at two ends of the model body (1) and a longitudinal conveyor belt (3) sleeved on the two longitudinal movement wheels (2). The upper surface of the longitudinal conveyor belt (3) is flush with a bridge surface of the model body (1). The transverse moving assembly comprises a follow-up part and a transverse moving part arranged on the follow-up part. The follow-up part is connected to the longitudinal conveyor belt (3) so that the longitudinal conveyor belt (3) drives the follow-up part to move in the longitudinal direction of the model body (1). The transverse moving part is connected to the follow-up part. The transverse moving part can move in the transverse direction of the model body (1), and the top surface of the transverse moving part is flush with the surface of the longitudinal conveying belt (3). The force measuring assembly comprises a force measuring balance (4) and a model vehicle (5). The force measuring balance (4) is connected to the top surface of the transverse moving part. The model vehicle (5) is connected to the force measuring balance (4). The present invention can simulate and measure the aerodynamic load when a vehicle moves along a bridge and changes the lane. The results of wind tunnel tests are more referenceable.

Description

A full-degree-of-freedom mobile wind tunnel test device for vehicles on a bridge Technical Field

[0001] The present invention relates to the technical field of wind tunnel experiments, and in particular to a full-freedom mobile wind tunnel test device for vehicles on a bridge. Background Art

[0002] The wind loads on vehicles on bridges under crosswinds are a key factor affecting safe driving, necessitating testing of the aerodynamic loads on vehicles on bridges. During testing, a bridge model is placed in a wind tunnel. The aerodynamic loads on the vehicle model on the bridge model are measured to simulate the aerodynamic loads that vehicles actually experience on the bridge. Existing wind tunnel testing systems for vehicle movement only simulate the longitudinal freedom of movement of vehicles along the bridge and fail to account for the complex steering maneuvers associated with road vehicles. With the development of bridge engineering, bridge deck widths have increased, and the bridge deck system has become more complex, resulting in significant differences in wind conditions between adjacent lanes on the bridge. Under crosswinds, complex maneuvers such as changing lanes can cause sudden changes in aerodynamic loads, impacting driving safety and comfort. Considering only the longitudinal movement of vehicles in wind tunnel testing makes it difficult to comprehensively analyze the aerodynamic performance of vehicles moving on bridges. Technical issues

[0003] The object of the present invention is to provide a full-freedom mobile wind tunnel test device for vehicles on a bridge, which can simulate and measure the aerodynamic load of a vehicle changing lanes. Technical Solutions

[0004] The embodiments of the present invention are achieved through the following technical solutions:

[0005] A full-degree-of-freedom mobile wind tunnel test device for vehicles on a bridge comprises a model body, a force measuring assembly, a longitudinal moving assembly, and a lateral moving assembly; the longitudinal moving assembly comprises longitudinally moving wheels disposed at both ends of the model body and a longitudinal conveyor belt sleeved on the two longitudinally moving wheels; the upper surface of the longitudinal conveyor belt is flush with the bridge deck of the model body;

[0006] The transverse moving assembly includes a follower portion and a transverse moving portion provided on the follower portion; the follower portion is connected to the longitudinal conveyor belt so that the longitudinal conveyor belt drives the follower portion to move longitudinally along the mold body; the transverse moving portion is connected to the follower portion; the transverse moving portion can move transversely along the mold body and the top surface of the transverse moving portion is flush with the surface of the longitudinal conveyor belt;

[0007] The force measuring assembly includes a force measuring balance and a model car; the force measuring balance is connected to the top surface of the transverse moving part; and the model car is connected to the force measuring balance.

[0008] Furthermore, the follower part includes a slide rail arranged along the longitudinal direction of the model body and a slider matched with the slide rail; the slider is connected to the longitudinal conveyor belt; the transverse moving part includes a support rod, a transverse wheel and a transverse conveyor belt; a support rod is provided on both sides of the slider; each support rod is provided with a transverse wheel at one end away from the slider; the two transverse wheels are arranged opposite to each other and the two ends of the transverse conveyor belt are respectively connected to one transverse wheel; the upper surface of the transverse conveyor belt is flush with the longitudinal conveyor belt and the force balance is connected to the upper surface of the transverse conveyor belt.

[0009] Furthermore, the model body is also provided with a plurality of height adjustment members distributed longitudinally along the model body; the slide rail is provided on the height adjustment members.

[0010] Furthermore, the height adjustment member includes a support column, an adjustment rod and an adjustment nut; the support column is vertically arranged inside the model body; the adjustment nut is threadedly connected to the outside of the support column; the adjustment rod is connected to the adjustment nut so that the rotation of the adjustment nut can drive the adjustment rod to rise and fall; the slide rail is connected to the adjustment rod.

[0011] Furthermore, a support plate is provided on the top of the slider; the longitudinal conveyor belt is connected to two opposite sides of the support plate; and the lower surface of the transverse conveyor belt is attached to the upper surface of the support plate.

[0012] Furthermore, a rotating shaft is rotatably provided at one end of the support rod away from the sliding block; and one of the traverse wheels is provided on each side of the support rod.

[0013] Furthermore, each support rod is provided with a driving assembly at one end away from the slider; and each group of driving assemblies is transmission-connected to one of the rotating shafts.

[0014] Furthermore, a mounting seat is provided at the bottom of the force measuring balance; the mounting seat is provided with a plurality of mounting holes; a circular groove-shaped mounting groove is provided on the upper surface of the transverse conveyor belt; a rotating disk is provided in the mounting groove; screw holes are provided on the rotating disk to cooperate with the mounting holes; and a driving motor for driving the rotating disk to rotate is also provided in the mounting groove.

[0015] Furthermore, the transverse conveyor belt includes a belt and a foam board laid above the belt. Beneficial effects

[0016] The technical solutions of the embodiments of the present invention have at least the following advantages and beneficial effects:

[0017] When the full-degree-of-freedom mobile wind tunnel test apparatus for vehicles on bridges of the present invention is in use, the rotation of the longitudinal wheel drives the longitudinal conveyor belt tensioned on the longitudinal wheel, thereby driving the follower unit to follow the longitudinal conveyor belt. The force-measuring assembly follows the follower unit, and the force-measuring assembly measures the aerodynamic loads on the vehicle model at various locations on the bridge model body, thereby simulating and measuring the aerodynamic loads on the vehicle as it moves along the bridge. As the vehicle model moves longitudinally along the bridge model body, the transverse unit also drives the vehicle model to move laterally along the model body, thereby simulating lane changes. This effectively simulates and measures the aerodynamic loads on the vehicle as it moves along the bridge and changes lanes.

[0018] This full-degree-of-freedom mobile wind tunnel test device for vehicles on bridges can not only simulate and test the aerodynamic loads of vehicles moving along the bridge, but also simulate and measure the aerodynamic loads of vehicles moving along the bridge and changing lanes, making the wind tunnel test results more referenceable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0020] FIG1 is a schematic structural diagram of a full-degree-of-freedom mobile wind tunnel test apparatus for vehicles on a bridge according to the present invention;

[0021] Figure 2 is a schematic diagram of the interior of the full-degree-of-freedom mobile wind tunnel test device for vehicles on a bridge;

[0022] Figure 3 is a schematic diagram of the cooperation between the longitudinal conveyor belt and the transverse conveyor belt;

[0023] FIG4 is a schematic diagram showing the cooperation between the transverse conveyor belt and the force measuring device.

[0024] Icon: 1-model body, 2-longitudinal wheel, 3-longitudinal conveyor belt, 4-force measuring balance, 5-model car, 6-slide rail, 7-slider, 8-support rod, 9-transverse wheel, 10-transverse conveyor belt, 101-belt, 102-foam board, 11-support plate, 12-adjusting rod, 13-rotating shaft, 14-drive assembly, 15-mounting seat, 16-mounting slot, 17-rotating disk, 18-drive motor, 19 support column, 20-adjusting nut. Modes for Carrying Out the Invention

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition or explanation in subsequent drawings.

[0028] In the description of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] It should also be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific contexts. Example

[0030] As shown in Figures 1 to 4, the present invention provides a full-degree-of-freedom mobile wind tunnel test device for vehicles on a bridge, comprising a model body 1, a force measuring assembly, a longitudinal moving assembly, and a lateral moving assembly. The model body 1 is a model of a real bridge reduced in size according to a certain ratio, and its appearance is similar to that of a real bridge. The longitudinal moving assembly includes longitudinal wheels 2 arranged at both ends of the model body 1 and a longitudinal conveyor belt 3 sleeved on the two longitudinal wheels 2. The two longitudinal wheels 2 tension the longitudinal conveyor belt 3 so that the two longitudinal wheels 2 and the longitudinal conveyor belt 3 are combined to form a transmission belt structure. The longitudinal conveyor belt 3 moves when the longitudinal wheels 2 rotate. In order to more conveniently drive the longitudinal conveyor belt 3 to move, a motor can be provided to drive the longitudinal wheels 2 to rotate. The upper surface of the longitudinal conveyor belt 3 is flush with the bridge deck of the model body 1. At this time, the upper surface of the longitudinal conveyor belt 3 is the bridge deck of the model body 1.

[0031] The transverse movement assembly includes a follower and a transverse movement unit mounted on the follower. The follower is connected to the longitudinal conveyor belt 3 so that the longitudinal conveyor belt 3 drives the follower to move longitudinally along the model body 1. The transverse movement unit is connected to the follower. The transverse movement unit can move transversely along the model body 1, with the top surface of the transverse movement unit flush with the surface of the longitudinal conveyor belt 3. The follower and transverse movement units can have various structural forms. In this embodiment, the follower includes a slide rail 6 arranged longitudinally along the model body 1 and a slider 7 that engages the slide rail 6. The slide rail 6 is disposed within the model body 1. Both ends of the slider 7 are connected to the longitudinal conveyor belt 3. When the longitudinal conveyor belt 3 moves, the slider 7 slides along the slide rail 6. The transverse movement unit includes support rods 8, traverse wheels 9, and a transverse conveyor belt 10. A support rod 8 is disposed on each side of the slider 7. Each support rod 8 is provided with a traverse wheel 9 at the end away from the slider 7. The two support rods 8 support the two traverse wheels 9 on either side of the slider 7, respectively, so that the two traverse wheels 9 are located on opposite sides of the model body 1. Two traversing wheels 9 are positioned opposite each other, with each end of the transverse conveyor belt 10 connected to a traversing wheel 9. When the traversing wheels 9 rotate, they wind up the transverse conveyor belt 10, causing it to move to one side. The upper surface of the transverse conveyor belt 10 is flush with the longitudinal conveyor belt 3. The force-measuring assembly includes a force balance 4 and a model car 5. The force balance 4 is connected to the upper surface of the transverse conveyor belt 10. The model car 5 is connected to the force balance 4.

[0032] When the full-degree-of-freedom mobile wind tunnel test apparatus for vehicles on a bridge of the present invention is in use, the rotation of the longitudinal wheel 2 drives the longitudinal conveyor belt 3, which is tensioned on the longitudinal wheel 2, to move, thereby driving the slider 7 to follow the longitudinal conveyor belt 3. The model vehicle 5 moves along with the slider 7, and the aerodynamic loads on the model vehicle 5 at various locations on the bridge model body 1 are measured by the force balance 4, thereby simulating and measuring the aerodynamic loads on the vehicle as it moves along the bridge. As the model vehicle 5 moves longitudinally along the bridge model body 1, the traverse wheel 9 rotates, driving the transverse conveyor belt 10 to move transversely along the model body 1, thereby driving the model vehicle 5 to move transversely along the model body 1, thereby simulating the vehicle changing lanes. This effectively simulates and measures the aerodynamic loads on the vehicle as it moves along the bridge and changes lanes.

[0033] This full-degree-of-freedom wind tunnel test system for vehicles on bridges not only simulates and measures the aerodynamic loads on vehicles moving along the bridge, but also simulates and measures the aerodynamic loads on vehicles moving along the bridge and changing lanes. This makes the wind tunnel test results more reliable. Both the transverse conveyor belt 10 and the longitudinal conveyor belt 3 are flush with the top surface of the model body 1, preventing unevenness in the bridge deck from affecting airflow and, in turn, the value of the simulation and measurement results.

[0034] In this embodiment, a support plate 11 is provided on top of the slider 7. The longitudinal conveyor belt 3 is connected to opposite sides of the support plate 11. The lower surface of the transverse conveyor belt 10 is in contact with the upper surface of the support plate 11. This provides support from the support plate 11 below the transverse conveyor belt 10. This provides better support for the force balance 4 and the model car 5, preventing the transverse conveyor belt 10 from collapsing under stress.

[0035] In this embodiment, the model body 1 is further provided with several height adjustment members distributed longitudinally along the model body 1. A slide rail 6 is provided on the height adjustment members. Specifically, the height adjustment members include a support column 19, an adjustment rod 12, and an adjustment nut 20. The support column 19 is vertically disposed within the model body 1. The adjustment nut 20 is threadedly connected to the exterior of the support column 19. The adjustment rod 12 is connected to the adjustment nut 20 so that rotation of the adjustment nut 20 drives the adjustment rod 12 up and down. Grooves can be provided along the circumference of the outer wall of the adjustment nut 20, and a circular sleeve can be provided on the adjustment rod 12 so that the sleeve fits within the groove. The fit between the sleeve and the groove prevents the sleeve from detaching, ensuring that the adjustment rod 12 always remains in the same position on the adjustment nut 20. At the same time, the adjustment nut 20 can rotate within the sleeve. This ensures that the adjustment nut 20 can rotate normally around the support column 19, thereby adjusting the height of the adjustment rod 12 relative to the support column 19. The slide rail 6 is connected to the adjustment rod 12. This structure can be used to easily adjust the height of each adjusting rod 12, thereby adjusting the height of the slide rail 6 to a suitable position. It is also convenient to adjust the height of the two ends of the slide rail 6 so that the slide rail 6 is parallel to the bridge deck of the model body 1.

[0036] In this embodiment, a rotating shaft 13 is rotatably provided at one end of the support rod 8 away from the slider 7. The rotating shaft 13 is provided with a traversing wheel 9 on each side of the support rod 8. This allows the support rod 8 to have a traversing wheel 9 on both sides, so that the force is balanced.

[0037] In this embodiment, each support rod 8 is provided with a drive assembly 14 at one end away from the slider 7. Each set of drive assemblies 14 is transmission-connected to a rotating shaft 13. The drive assembly 14 can be a conventional combination of a motor and a gear drive.

[0038] In this embodiment, a mounting base 15 is provided at the bottom of the force measuring balance 4. The mounting base 15 is provided with a plurality of mounting holes. A circular groove-shaped mounting groove 16 is provided on the upper surface of the transverse conveyor belt 10. The mounting groove 16 and the transverse conveyor belt 10 are connected by bonding. The mounting groove 16 can be a hard circular groove component. A rotating disk 17 is provided in the mounting groove 16. The rotating disk 17 is provided with screw holes in conjunction with the mounting holes. After the mounting base 15 is placed on the rotating disk 17, the mounting base 15 and the rotating disk 17 can be fixed together by screws. A driving motor 18 for driving the rotating disk 17 to rotate is also provided in the mounting groove 16. The driving motor 18 drives the rotating disk 17 to rotate through gears. Since the mounting groove 16 is small in size, the driving motor 18 can be a micro motor with a diameter of about 1 cm.

[0039] During the simulation of the vehicle changing lanes, the drive motor 18 drives the rotary disk 17 to rotate, thereby driving the model car 5 to rotate a certain angle, thereby more realistically simulating the state of the car when changing lanes.

[0040] In this embodiment, the transverse conveyor belt 10 includes a belt 101 and a foam board 102 laid on top of the belt 101. The belt 101 has good tensile strength and is suitable as the main body of the transverse conveyor belt 10. However, the size of the model body 1 is limited, and the bending radius of the transverse conveyor belt 10 is small. If the belt 101 is too thick, its bending performance will be affected, making it inconvenient for the transverse wheel 9 to wind. If the belt 101 is too thin, it will not be convenient to ensure that the transverse conveyor belt 10 is flush with the longitudinal conveyor belt 3. If the transverse conveyor belt 10 and the longitudinal conveyor belt 3 are not flush, it will affect the flow field at the bottom of the model car 5. Therefore, the foam board 102 is used for filling, so that the surface of the foam board 102 is flush with the surface of the longitudinal conveyor belt 3, thereby better restoring the flow field at the bottom of the vehicle. The foam board 102 is relatively soft and can be bent well.

[0041] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A full-degree-of-freedom moving wind tunnel test device for vehicles on a bridge, characterized in that: it includes a model body (1), a force measuring component, a longitudinal moving component and a transverse moving component; the longitudinal moving component includes longitudinal moving wheels (2) arranged at both ends of the model body (1) and a longitudinal conveyor belt (3) sleeved on the two longitudinal moving wheels (2); the upper surface of the longitudinal conveyor belt (3) is flush with the bridge deck of the model body (1); the transverse moving component includes a follower part and a transverse moving part arranged on the follower part; the follower part is connected to the longitudinal conveyor belt (3) so that the longitudinal conveyor belt (3) drives the follower part to move longitudinally along the model body (1); the transverse moving part is connected to the follower part; the transverse moving part can move transversely along the model body (1) and the top surface of the transverse moving part is flush with the surface of the longitudinal conveyor belt (3); the force measuring component includes a force measuring balance (4) and a model vehicle (5); the force measuring balance (4) is connected to the top surface of the transverse moving part; the model vehicle (5) is connected to the force measuring balance (4); the follower part includes a slide rail (6) arranged longitudinally along the model body (1) and a slider (7) cooperating with the slide rail (6); the slider (7) is connected to the longitudinal conveyor belt (3); the transverse moving part includes a support rod (8), a transverse moving wheel (9) and a transverse conveyor belt (10); one support rod (8) is arranged on each side of the slider (7); a transverse moving wheel (9) is arranged at one end of each support rod (8) away from the slider (7); the two transverse moving wheels (9) are arranged oppositely and both ends of the transverse conveyor belt (10) are respectively connected to one transverse moving wheel (9); the upper surface of the transverse conveyor belt (10) is flush with the longitudinal conveyor belt (3) and the force measuring balance (4) is connected to the upper surface of the transverse conveyor belt (10).

2. The full-degree-of-freedom moving wind tunnel test device for vehicles on a bridge according to claim 1, characterized in that: the model body (1) is further provided with a plurality of height adjusting members distributed longitudinally along the model body (1); the slide rail (6) is arranged on the height adjusting members.

3. The full-degree-of-freedom moving wind tunnel test device for vehicles on a bridge according to claim 2, characterized in that: the height adjusting member includes a support column (19), an adjusting rod (12) and an adjusting nut (20); the support column (19) is vertically arranged inside the model body (1); the adjusting nut (20) is threadedly connected to the outside of the support column (19); the adjusting rod (12) is connected to the adjusting nut (20) so that the rotation of the adjusting nut (20) can drive the adjusting rod (12) to move up and down; the slide rail (6) is connected to the adjusting rod (12).

4. The full-degree-of-freedom moving wind tunnel test device for vehicles on a bridge according to claim 3, characterized in that: A support plate (11) is provided on the top of the slider (7); the two opposite sides of the support plate (11) are respectively connected to one end of the longitudinal conveyor belt (3); and the lower surface of the transverse conveyor belt (10) is attached to the upper surface of the support plate (11).

5. The full-freedom mobile wind tunnel test device for vehicles on a bridge according to claim 4, Features: A rotatable rotating shaft (13) is provided at one end of the two support rods (8) away from the sliding block (7), and a traverse wheel (9) is provided on each of the two rotating shafts (13).

6. The full-freedom mobile wind tunnel test device for vehicles on a bridge according to claim 5, Features: A driving assembly (14) is provided at one end of each support rod (8) away from the sliding block (7); each group of driving assemblies (14) is transmission-connected to one of the rotating shafts (13).

7. The full-freedom mobile wind tunnel test device for vehicles on a bridge according to claim 6, Features: The bottom of the force measuring balance (4) is provided with a mounting seat (15); the mounting seat (15) is provided with a plurality of mounting holes; the upper surface of the transverse conveyor belt (10) is provided with a circular groove-shaped mounting groove (16); a rotating disk (17) is provided in the mounting groove (16); screw holes are provided in the rotating disk (17) to match the mounting holes; and a driving motor (18) for driving the rotating disk (17) to rotate is also provided in the mounting groove (16).

8. The full-freedom mobile wind tunnel test device for vehicles on a bridge according to claim 7, Features: The transverse conveyor belt (10) comprises a belt (101) and a foam board (102) laid on the belt (101).

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