An overtaking test device in a car wind tunnel and a method for using and stress analysis thereof

Abstract

The application relates to an overtaking test device in an automobile wind tunnel and a use and stress analysis method thereof, which comprises a wind tunnel, a balance rotating device, a first vehicle rotating device, a second vehicle rotating device, an overtaken vehicle and an overtaking vehicle. The balance rotating device is installed at an air outlet of the wind tunnel and is internally provided with a force sensor. The overtaken vehicle and the overtaking vehicle are respectively installed on independent force sensors of the balance rotating device through the first vehicle rotating device and the second vehicle rotating device. The first vehicle rotating device and the second vehicle rotating device can respectively drive the overtaken vehicle and the overtaking vehicle to rotate counterclockwise or clockwise. The balance rotating device is configured to be able to rotate clockwise or counterclockwise, so that the balance rotating device can drive the overtaken vehicle and the overtaking vehicle to rotate, so as to exchange the relative front and rear positions of the overtaken vehicle and the overtaking vehicle. The application can flexibly adjust the relative positions of the two vehicles and their orientations.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle testing, in particular to an automobile wind tunnel in-car overtaking test device and its use and stress analysis method. BACKGROUND

[0002] During the driving process of the vehicle, the aerodynamic force will generate a lateral force. If the aerodynamic design of the vehicle is unreasonable, the lateral force is too large, the directional stability of the vehicle will be seriously affected, and then the driving route of the vehicle will deviate, the driver needs to constantly correct the direction to maintain straight driving, which increases the driving difficulty and fatigue. Secondly, during the driving process of the vehicle, the aerodynamic force will also generate lift or downforce. For a general vehicle, moderate downforce can increase the adhesion between the tire and the ground, which helps to improve the stability of the vehicle when driving on a curve or changing lanes at high speed, so that the vehicle can better follow the driver's operation. If the lift is too large, it will reduce the tire adhesion, make the vehicle float, and the directional stability will be poor, and even at high speed, it may be dangerous to lose control. Therefore, it is necessary to test and optimize the aerodynamic force received by the vehicle to improve the dynamic economy and handling stability of the vehicle during the driving process.

[0003] Therefore, with the increasing requirements of the automobile industry on aerodynamic performance, wind tunnel test has become a core means to evaluate the aerodynamic characteristics of the vehicle. The traditional wind tunnel test focuses on the analysis of the aerodynamic characteristics of the single vehicle under the steady state condition, and the aerodynamic load data of the vehicle under the specific wind speed and yaw angle are obtained through the fixed test bench. However, in actual road driving, the vehicle is often in a dynamic interactive state, especially in the overtaking condition, the high-speed change of the relative position of the two vehicles will cause complex transient aerodynamic interference effect, but the common overtaking test is usually simulated by virtual simulation, but the virtual simulation will simplify the vehicle dynamics model, so that the calculated data will have a gap with the actual data.

[0004] And the conventional wind tunnel is limited by the fixed test bench structure and the compact space, and cannot design a traction track to simulate the continuous change process of the relative position of the two vehicles. Although some advanced wind tunnels introduce a moving arm system, the movement freedom degree of the moving arm system is limited to single-axis translation, it is difficult to reproduce the spatial coupling characteristics of the trajectories of the two vehicles in the overtaking process, and the overall fixed structure is exposed to the airflow, which has a greater influence on the aerodynamic force measurement of the test vehicle. SUMMARY

[0005] The present application provides an automobile wind tunnel in-car overtaking test device and its use and stress analysis method to solve the problem that the existing wind tunnel cannot simulate the change of the relative position of the two vehicles.

[0006] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0007] The application discloses an overtaking test device in an automobile wind tunnel, comprising a wind tunnel, a balance rotating device, a first vehicle rotating device, a second vehicle rotating device, an overtaken vehicle and an overtaking vehicle, wherein the balance rotating device is installed at an air outlet of the wind tunnel; the balance rotating device is configured to rotate clockwise or counterclockwise, the overtaken vehicle and the overtaking vehicle are both installed on the balance rotating device, so that the balance rotating device can drive the overtaken vehicle and the overtaking vehicle to rotate, to exchange the relative front and rear positions of the overtaken vehicle and the overtaking vehicle; the overtaken vehicle is installed on the balance rotating device through the first vehicle rotating device, the overtaking vehicle is installed on the balance rotating device through the second vehicle rotating device, the first vehicle rotating device and the second vehicle rotating device can drive the overtaken vehicle and the overtaking vehicle to rotate counterclockwise or clockwise respectively; the first vehicle rotating device and the second vehicle rotating device are configured to rotate at the same speed as the balance rotating device and in the opposite direction, so that the front of the overtaken vehicle and the front of the overtaking vehicle are kept facing the wind tunnel.

[0008] According to the above technical means, through the combination of the balance rotating device, the first vehicle rotating device and the second vehicle rotating device, the relative positions of the overtaken vehicle and the overtaking vehicle and their orientations can be flexibly adjusted, so that the front of the overtaken vehicle and the front of the overtaking vehicle are always kept facing forward. Since the first vehicle rotating device can drive the overtaken vehicle to rotate, the second vehicle rotating device can drive the overtaking vehicle to rotate, and the rotating speeds of the two are consistent with that of the balance rotating device, the consistency of the test conditions can be ensured, the driving posture of the vehicle in the simulation of overtaking process is ensured to be consistent with the actual situation, and thus the accuracy of the test results is improved. Furthermore, the wind tunnel provides the aerodynamic environment when the vehicle is driving, and the balance rotating device is used to exchange the relative front and rear positions of the overtaken vehicle and the overtaking vehicle, so that the overtaking process on the actual road can be simulated more realistically, and the aerodynamic characteristics in the overtaking process can be provided as a basis for research.

[0009] Further, the balance rotating device comprises a first support, a second support and a rotating table body, the first vehicle rotating device is supported on the rotating table body through the first support, and the second vehicle rotating device is supported on the rotating table body through the second support, so that the rotating table body can drive the overtaken vehicle and the overtaking vehicle to rotate clockwise or counterclockwise, and the overtaken vehicle and the overtaking vehicle can be driven by the first vehicle rotating device and the second vehicle rotating device to rotate counterclockwise or clockwise, so that the front of the overtaken vehicle and the front of the overtaking vehicle are always kept facing the wind tunnel and the relative position exchange is completed.

[0010] According to the above technical means, the overtaken vehicle and the overtaking vehicle are connected with the balance rotating device through the first support and the second support respectively, which ensures the stability of the connection between the overtaken vehicle and the overtaking vehicle and the balance rotating device, and can withstand various forces generated by the wind tunnel wind and the rotation of the vehicle during the test; when the balance rotating device drives the overtaken vehicle and the overtaking vehicle to rotate clockwise or counterclockwise as a whole, the first vehicle rotating device and the second vehicle rotating device can simultaneously drive the vehicle to rotate in the opposite direction, accurately simulating the change of the motion state of the vehicle in the actual overtaking process, and providing a real and reliable test scene for the related research of automobile aerodynamics and vehicle dynamics.

[0011] Further, the first support and the second support are each provided with a force sensor, which is used to detect the aerodynamic force and torque received by the overtaken vehicle and the overtaking vehicle.

[0012] According to the above technical means, by installing a force sensor on the balance rotating device, the aerodynamic force and torque received by the overtaken vehicle and the overtaking vehicle during the wind tunnel test can be directly measured, and the aerodynamic force such as wind resistance and side leaning force received by the vehicle at different relative positions can be accurately understood, thereby providing a basis for the stability and maneuverability of the vehicle.

[0013] Further, the first vehicle rotating device comprises a driving assembly, a rotating assembly and a transmission assembly, the driving assembly is installed on the first support through a first connecting piece; the driving assembly is connected with the rotating assembly through the transmission assembly to drive the rotating assembly to rotate; and the overtaken vehicle is installed on the rotating assembly.

[0014] According to the above technical means, the driving assembly is connected with the rotating assembly through the transmission assembly, which can transmit power from the outside to the rotating assembly, providing a power source for the rotation of the overtaken vehicle, and ensuring that the overtaken vehicle can rotate according to the test requirements during the test; and the first vehicle rotating device is divided into the driving assembly and the rotating assembly, which facilitates the separate inspection, repair or replacement of each component when the device fails or needs to be upgraded and maintained, thereby reducing the maintenance cost and difficulty and improving the service life of the device.

[0015] Further, the driving assembly comprises a driving gear, the rotating assembly comprises a driven gear, and the transmission assembly is a gear set, the driving gear is engaged with the transmission assembly, and the transmission assembly is engaged with the driven gear; so that the driving gear can drive the driven gear to rotate through the gear set; and the overtaken vehicle is installed on the driven gear.

[0016] According to the above technical means, through the meshing between the driving gear, the gear set and the driven gear, the power of the driving gear can be effectively transmitted to the driven gear, realizing the transmission of power from the driving assembly to the rotating assembly, completing the conversion of the motion form, so that the overtaken vehicle can obtain the rotating power; the gear transmission has high transmission precision, so that the meshing relationship between the gears is relatively stable, which can ensure the relatively accurate transmission ratio between the driving gear and the driven gear, so that the rotation of the overtaken vehicle is more stable, predictable, and the motion error and uncertainty are reduced; secondly, the existence of the gear set can realize the adjustment of the rotation speed and the torque according to the different gear ratio, so as to meet the specific needs of the overtaken vehicle rotating at different speeds.

[0017] Further, the transmission assembly comprises a first reduction gear and a second reduction gear, the first reduction gear and the second reduction gear are coaxially fixedly installed, the first reduction gear is engaged with the driving gear, and the second reduction gear is engaged with the driven gear, so that the driving gear can drive the driven gear to rotate through the first reduction gear and the second reduction gear.

[0018] According to the above technical means, through the design of the first reduction gear and the second reduction gear, when the driving gear rotates, the power is transmitted to the driven gear through the first reduction gear and the second reduction gear in turn, the multi-stage reduction structure can effectively reduce the rotation speed, and at the same time, the torque is enlarged according to the transmission ratio, so as to realize the accurate control of the rotation speed of the driven gear, and then simulate the rotation speed of the overtaken vehicle in different overtaking scenes, improve the accuracy and repeatability of the test.

[0019] Further, the driving assembly further comprises a support, a motor and a driving shaft, the support is installed on the first support through a first connecting piece, the motor is installed on the support, and the driving gear is installed on the motor through the driving shaft; the driven gear is rotatably installed on the support.

[0020] According to the above technical means, the support is mounted on the first support through the first connecting piece, thereby providing a stable mounting basis for the entire driving assembly; the motor is mounted in the support, thereby forming a compact structural layout and effectively saving space, and also playing a certain protective role for the motor, reducing the influence of external factors such as airflow, sundries, etc. on the motor; the motor is connected with the driving gear through the driving shaft, thereby efficiently transmitting the power generated by the motor to the driving gear, reducing energy loss in the power transmission process, and ensuring that the driving assembly can provide stable and powerful power for the rotating assembly, so that the overtaken vehicle can rotate stably and continuously according to the test requirements; secondly, the driven gear is directly mounted on the support and connected with the overtaken vehicle, and this structural layout is compact, thereby reducing additional connecting components and reducing the complexity of the system; at the same time, the support provides stable support for the entire rotating assembly, so that the driven gear remains stable during power transmission, reduces vibration and deviation, and improves the reliability and durability of the entire device.

[0021] Further, a method for using the automobile wind tunnel overtaking test device is also provided. The method comprises the following steps: S01: mounting the overtaken vehicle and the overtaking vehicle on the balance rotating device through the first vehicle rotating device and the second vehicle rotating device respectively, the front of the overtaken vehicle and the front of the overtaking vehicle facing the wind tunnel, and the overtaken vehicle being located in front of the overtaking vehicle; S02: starting the wind tunnel, after the wind speed of the wind tunnel reaches a preset value, starting the balance rotating device, the first vehicle rotating device and the second vehicle rotating device to rotate, until the overtaking vehicle is located in front of the overtaken vehicle, completing the overtaking test, and stopping the balance rotating device, the first vehicle rotating device and the second vehicle rotating device.

[0022] According to the above technical means, by installing the overtaken vehicle and the overtaking vehicle on different rotating devices respectively and placing them on the balance rotating device, and by making the vehicles in the wind tunnel environment, the overtaking situation on the actual road can be simulated more realistically; the airflow provided by the wind tunnel simulates the aerodynamic environment during driving, the first vehicle rotating device and the second vehicle rotating device and the balance rotating device can simulate the relative motion and position change of the vehicles during overtaking, thereby providing reliable experimental conditions for studying the aerodynamic characteristics during overtaking; keeping the vehicle head always facing the wind tunnel nozzle makes the direction of the airflow acting on the vehicle relatively stable during the simulation of overtaking, avoiding airflow turbulence caused by changes in the direction of the vehicle head, which affects the accuracy of aerodynamic data. Secondly, by clearly specifying the process of starting the wind tunnel first to make the wind speed reach the preset value, then starting each rotating device, and completing the test only when the overtaking vehicle is located in front of the overtaken vehicle, the conditions of each test are relatively consistent, which can ensure the repeatability and comparability of the test results, and then researchers can conduct multiple tests under the same conditions to obtain more accurate and reliable data, thereby analyzing the influence of various factors on the aerodynamic performance of the vehicle during overtaking.

[0023] Further, the balance rotating device, the first vehicle rotating device and the second vehicle rotating device are synchronous rotation: when the balance rotating device rotates clockwise by 180°, the first vehicle rotating device and the second vehicle rotating device both rotate counterclockwise by 180°, so that the vehicle head of the overtaken vehicle and the vehicle head of the overtaking vehicle keep facing the wind tunnel; when the balance rotating device rotates counterclockwise by 180°, the first vehicle rotating device and the second vehicle rotating device both rotate clockwise by 180°, so that the vehicle head of the overtaken vehicle and the vehicle head of the overtaking vehicle keep facing the wind tunnel.

[0024] According to the above technical means, by synchronously driving the balance rotating device to rotate clockwise by 180°, the first vehicle rotating device and the second vehicle rotating device to rotate counterclockwise by 180°, or the balance rotating device to rotate counterclockwise by 180°, the first vehicle rotating device and the second vehicle rotating device to rotate clockwise by 180°, and keeping the vehicle head of the overtaken vehicle and the vehicle head of the overtaking vehicle facing the wind tunnel, the relative position change of the vehicles during overtaking is simulated, and the driving direction of the vehicles is kept consistent with the airflow direction, successfully reproducing the complex dynamic process of overtaking.

[0025] Further, the application further provides a force analysis method of the device, which comprises the following steps: S10, acquiring the aerodynamic force and moment of the overtaken vehicle and the overtaking vehicle in the wind tunnel coordinate system by the force sensor when the balance rotating device rotates; S20, obtaining the aerodynamic force and moment of the overtaken vehicle and the overtaking vehicle in the wind tunnel coordinate system according to the rotating angle of the balance rotating device and the aerodynamic force and moment of the overtaken vehicle and the overtaking vehicle in the balance coordinate system; S30, analyzing the aerodynamic force and moment of the overtaken vehicle and the overtaking vehicle in the wind tunnel coordinate system to determine the relationship between the aerodynamic characteristics and the control stability of the overtaking vehicle in the overtaking process, so as to optimize the vehicle performance.

[0026] According to the above technical means, the aerodynamic force and moment of the overtaken vehicle and the overtaking vehicle in the balance coordinate system are directly acquired by the force sensor in the balance rotating device, and then the aerodynamic force and moment of the overtaken vehicle and the overtaking vehicle in the wind tunnel coordinate system are obtained through coordinate conversion by combining the rotating angle of the balance rotating device, since the balance coordinate system is relatively fixed to the test device, the aerodynamic force and moment in the balance coordinate system are more accurate and provide reliable data basis for subsequent analysis; the aerodynamic force and moment of the overtaken vehicle and the overtaking vehicle in the wind tunnel coordinate system are analyzed to obtain the influence of the aerodynamic force in different relative positions on the vehicle stability and controllability, and then the vehicle performance is optimized.

[0027] The application has the following advantages:

[0028] 1. The relative positions and orientations of the overtaken vehicle and the overtaking vehicle can be flexibly adjusted by the combination of the balance rotating device, the first vehicle rotating device and the second vehicle rotating device, so that the front of the overtaken vehicle and the front of the overtaking vehicle always face forward, since the first vehicle rotating device can drive the overtaken vehicle to rotate, the second vehicle rotating device can drive the overtaking vehicle to rotate, and the rotating speeds of the two devices are consistent with the rotating speed of the balance rotating device, the consistency of the test conditions can be ensured, the driving posture of the vehicle in the simulation overtaking process conforms to the actual situation, and thus the accuracy of the test results is improved.

[0029] 2. The wind tunnel provides the aerodynamic environment when the vehicle drives, and the balance rotating device is used to realize the exchange of the relative front and rear positions of the overtaken vehicle and the overtaking vehicle, so that the overtaking process on the actual road can be more realistically simulated, and the aerodynamic characteristics in the overtaking process are provided. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1Figure 1 is a schematic diagram of the present application;

[0031] Figure 2 Figure 2 is a top view of the present application;

[0032] Figure 3 Figure 3 is a schematic diagram of the present application;

[0033] Figure 4 Figure 4 is a schematic diagram of the present application;

[0034] Figure 5 Figure 5 is a schematic diagram of the present application;

[0035] Figure 6 Figure 6 is a schematic diagram of the present application;

[0036] Figure 7 Figure 7 is a schematic diagram of the present application;

[0037] Figure 8 Figure 8 is a schematic diagram of the present application;

[0038] Figure 9 Figure 9 is a schematic diagram of the present application;

[0039] Figure 10 Figure 10 is a schematic diagram of the present application;

[0040] Figure 11 Figure 11 is a flow chart of the present application;

[0041] Figure 12 Figure 12 is a flow chart of the present application.

[0042] Reference signs:

[0043] 1 - wind tunnel;

[0044] 2 - balance rotation device; 21 - first support; 22 - second support; 23 - turntable body; 231 - moving belt; 24 - first connecting piece; 25 - second connecting piece;

[0045] 3 - first vehicle rotation device; 31 - driving assembly; 311 - driving gear; 312 - support; 3121 - support rod; 313 - driving shaft; 32 - rotation assembly; 321 - driven gear; 322 - bearing; 33 - transmission assembly; 331 - first reduction gear; 332 - second reduction gear;

[0046] 4 - second vehicle rotating device; 5 - vehicle being overtaken; 6 - overtaking vehicle.

[0047] The accompanying drawings are included to provide a further understanding of the application, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the application and, together with the description, serve to explain the principles of the application. In the drawings: DETAILED DESCRIPTION

[0048] Other advantages and benefits of the present application will become apparent to those skilled in the art upon reading and understanding the following detailed description of the application. The present application may be applied in a variety of different specific embodiments and presently contemplated embodiments will be presented in sufficient detail by the description that follows, taken in conjunction with the accompanying drawings. It will be apparent to those skilled in the art that the following detailed description of the application is provided for illustration only and not for the purpose of limiting the scope of the application.

[0049] It should be noted that the drawings included in the present disclosure are included to illustrate certain aspects of the application and should not be construed to limit the scope of the application. It will be apparent to those skilled in the art that substantial modifications can be made to the specific embodiments disclosed in this specification without departing from the spirit of the application. Accordingly, the drawings are only for purposes of illustration and should not be construed as limiting the scope of the application.

[0050] In the embodiments of the present application, the terms "first", "second", etc. are used only to describe and distinguish the application, and are not construed to imply or suggest relative importance or a specific number of the technical features indicated. Thus, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features.

[0051] In the embodiments of the present application, unless otherwise specified and limited, the term "connection" should be understood broadly, for example, "connection" can be fixed connection, or detachable connection, or integral; can be directly connected, or indirectly connected through intermediate medium.

[0052] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0053] like Figures 1-4 As shown, this embodiment provides an overtaking test device in a car wind tunnel, including: a wind tunnel 1, a balance rotation device 2, a first vehicle rotation device 3, a second vehicle rotation device 4, a vehicle to be overtaken 5, and an overtaking vehicle 6. The balance rotation device 2 is installed at the air outlet of the wind tunnel 1, as shown. Figure 2 As shown, the arrow points in the direction of the airflow in wind tunnel 1, so that wind tunnel 1 provides wind power to balance rotation device 2. Balance rotation device 2 is configured to rotate clockwise or counterclockwise. Both the overtaken vehicle 5 and the overtaking vehicle 6 are mounted on balance rotation device 2, so that balance rotation device 2 can drive the overtaken vehicle 5 and the overtaking vehicle 6 to rotate, thereby changing the relative front and rear positions of the overtaken vehicle 5 and the overtaking vehicle 6. The overtaken vehicle 5 is mounted on balance rotation device 2 via first vehicle rotation device 3, and the overtaking vehicle 6 is mounted on balance rotation device 2 via second vehicle rotation device 4. First vehicle rotation device 3 and second vehicle rotation device 4 can drive the overtaken vehicle 5 and the overtaking vehicle 6 to rotate counterclockwise or clockwise, respectively. First vehicle rotation device 3 and second vehicle rotation device 4 are configured to rotate at the same speed as balance rotation device 2, but in opposite directions, so that the front of the overtaken vehicle 5 and the front of the overtaking vehicle 6 are kept facing wind tunnel 1.

[0054] The overtaking vehicle 5 is installed on the balance rotating device 2 through the first vehicle rotating device 3, the overtaking vehicle 6 is installed on the balance rotating device 2 through the second vehicle rotating device 4, and the balance rotating device 2 is installed at the air outlet of the wind tunnel 1, so that the overtaking vehicle 5 and the overtaking vehicle 6 on the balance rotating device 2 can be subjected to the aerodynamic force and moment brought by the wind tunnel 1; during the test, the wind tunnel 1 is started first, and after the wind speed in the wind tunnel 1 is stabilized, the balance rotating device 2, the first vehicle rotating device 3 and the second vehicle rotating device 4 are started synchronously, so that the balance rotating device 2 drives the overtaking vehicle 5 and the overtaking vehicle 6 to rotate clockwise, while the first vehicle rotating device 3 and the second vehicle rotating device 4 can drive the overtaking vehicle 5 and the overtaking vehicle 6 to rotate counterclockwise, thereby adjusting the orientations of the front ends of the overtaking vehicle 5 and the overtaking vehicle 6, ensuring that the front ends of the overtaking vehicle 5 and the overtaking vehicle 6 are oriented towards the wind tunnel 1, and the rotational speed efficiency of the balance rotating device 2, the first vehicle rotating device 3 and the second vehicle rotating device 4 needs to be consistent; until the balance rotating device 2, the first vehicle rotating device 3 and the second vehicle rotating device 4 all rotate 180°, the test is ended, and the balance rotating device 2, the first vehicle rotating device 3 and the second vehicle rotating device 4 are closed.

[0055] In other embodiments, the balance rotating device 2 drives the overtaking vehicle 5 and the overtaking vehicle 6 to rotate counterclockwise, while the first vehicle rotating device 3 and the second vehicle rotating device 4 can drive the overtaking vehicle 5 and the overtaking vehicle 6 to rotate clockwise, and the rotational speed needs to be consistent, and the front ends need to be oriented forward, so that the front ends are always directed to the air outlet of the wind tunnel 1.

[0056] Through the combination of the balance rotating device 2, the first vehicle rotating device 3 and the second vehicle rotating device 4, the relative positions of the overtaking vehicle 5 and the overtaking vehicle 6 and their orientations can be flexibly adjusted, so that the front ends of the overtaking vehicle 5 and the overtaking vehicle 6 always keep forward, since the first vehicle rotating device 3 can drive the overtaking vehicle 5 to rotate, the second vehicle rotating device 4 can drive the overtaking vehicle 6 to rotate, and the rotational speeds of the three are consistent, the consistency of the test conditions can be ensured, the driving posture of the vehicle during the simulation of overtaking can be ensured to be consistent with the actual situation, and thus the accuracy of the test results is improved; secondly, the wind tunnel 1 provides the aerodynamic environment during the driving of the vehicle, and the balance rotating device 2 is used to realize the exchange of the relative positions of the overtaking vehicle 5 and the overtaking vehicle 6, so that the overtaking process on the actual road can be simulated more realistically, and a basis is provided for studying the aerodynamic characteristics during the overtaking process.

[0057] As Figures 2-4As shown in the embodiment, the balance rotating device 2 comprises a first support 21, a second support 22 and a rotating table body 23, the first vehicle rotating device 3 is supported on the rotating table body 23 through the first support 21, and the second vehicle rotating device 4 is supported on the rotating table body 23 through the second support 22, so that the rotating table body 23 drives the overtaken vehicle 5 and the overtaking vehicle 6 to rotate clockwise or counterclockwise, and the overtaken vehicle 5 and the overtaking vehicle 6 can rotate counterclockwise or clockwise under the driving of the first vehicle rotating device 3 and the second vehicle rotating device 4, so as to realize that the front of the overtaken vehicle 5 and the front of the overtaking vehicle 6 always face the wind tunnel 1 and complete the relative position exchange.

[0058] Preferably, as shown in the embodiment, Figure 3 and Figure 4 As shown in the embodiment, the balance rotating device 2 further comprises a first connecting piece 24 and a second connecting piece 25, the first vehicle rotating device 3 is connected with the first support 21 through the first connecting piece 24, and the second vehicle rotating device 4 is connected with the second support 22 through the second connecting piece 25.

[0059] Preferably, as shown in the embodiment, Figure 2 As shown in the embodiment, the rotating table body 23 is further provided with a moving belt 231, which is used for simulating the ground on which the vehicle travels.

[0060] The overtaken vehicle 5 and the overtaking vehicle 6 are connected with the balance rotating device 2 through the first support 21 and the second support 22 respectively, which ensures the stability of the connection between the overtaken vehicle 5 and the overtaking vehicle 6 and the balance rotating device 2, and can withstand various forces generated by the wind of the wind tunnel 1 and the rotation of the vehicle during the test; when the balance rotating device 2 drives the overtaken vehicle 5 and the overtaking vehicle 6 to rotate clockwise or counterclockwise as a whole, the first vehicle rotating device 3 and the second vehicle rotating device 4 can simultaneously drive the vehicle to rotate in the opposite direction, which accurately simulates the change of the motion state of the vehicle in the actual overtaking process, and can provide a real and reliable test scene for the related research of automobile aerodynamics and vehicle dynamics.

[0061] In the embodiment, force sensors (not shown in the figure) are installed on the first support 21 and the second support 21, which are used for detecting the aerodynamic force and torque received by the overtaken vehicle 5 and the overtaking vehicle 6.

[0062] Preferably, the force sensor adopts a multi-dimensional force / torque sensor, which can measure the force and torque in two or more directions at the same time, so that the aerodynamic force and torque received by the overtaken vehicle 5 and the overtaking vehicle 6 in the balance coordinate system can be directly obtained during the overtaking test.

[0063] By installing force sensors on the first support 21 and the second support 21, the aerodynamic force and moment received by the overtaking vehicle 5 and the overtaken vehicle 6 in the wind tunnel test can be directly received, and the aerodynamic force received by the vehicle at different relative positions can be accurately understood, thereby providing a basis for the stability and handling of the vehicle.

[0064] As shown in Figure 1 , Figure 3 and Figure 4 , in the embodiment, the first vehicle rotating device 3 comprises a driving assembly 31, a rotating assembly 32 and a transmission assembly 33, the driving assembly 31 is installed on the first support 21 through the first connecting piece 24, the driving assembly 31 is connected with the rotating assembly 32 through the transmission assembly 33 to drive the rotating assembly 32 to rotate; the overtaking vehicle 5 is installed on the rotating assembly 32, so that when the driving assembly 31 drives the rotating assembly 32 to rotate, the rotating assembly 32 can drive the overtaking vehicle 5 to rotate during the rotation of the rotating assembly 32.

[0065] Preferably, the second vehicle rotating device 4 has the same parts and connecting and installing mode as the first vehicle rotating device 3.

[0066] The driving assembly 31 is connected with the rotating assembly 32 through the transmission assembly 33, can transmit power from the outside to the rotating assembly 32, provides a power source for the rotation of the overtaking vehicle 5, ensures that the overtaking vehicle 5 can rotate according to the test requirements during the test; and the first vehicle rotating device 3 is divided into the driving assembly 31 and the rotating assembly 32, which facilitates the individual inspection, repair or replacement of each component when the device fails or needs to be upgraded and maintained, reduces the maintenance cost and difficulty, and prolongs the service life of the device.

[0067] As shown in Figure 1 , in the embodiment, the driving assembly 31 comprises a driving gear 311, the rotating assembly 32 comprises a driven gear 321, and the transmission assembly 33 is a gear set, the driving gear 311 is engaged with the transmission assembly 33, and the transmission assembly 33 is engaged with the driven gear 321, so that the driving gear 311 can drive the driven gear 321 to rotate through the transmission assembly 33; the overtaking vehicle 5 is installed on the driven gear 321, and when the driving gear 311 drives the driven gear 321 to rotate, the rotation of the driven gear 321 can drive the overtaking vehicle 5 to rotate.

[0068] Through the meshing between the driving gear 311, the transmission assembly 33 and the driven gear 321, the power of the driving gear 311 can be effectively transmitted to the driven gear 321, realizing the transmission of power from the driving assembly 31 to the rotating assembly 32, completing the conversion of the motion form, so that the overtaken vehicle 5 can obtain the rotating power; the gear transmission has high transmission precision, the meshing relationship between the gears is relatively stable, and the transmission ratio between the driving gear 311 and the driven gear 321 can be ensured to be relatively accurate, so that the rotation of the overtaken vehicle 5 is more stable, predictable, and the motion error and uncertainty are reduced; secondly, the existence of the gear set can realize the adjustment of the rotating speed and the torque according to the different gear ratios, so as to meet the specific needs of the rotation of the overtaken vehicle 5.

[0069] As shown in Figure 1 In the embodiment, the transmission assembly 33 includes a first reduction gear 331 and a second reduction gear 332, the first reduction gear 331 and the second reduction gear 332 are coaxially fixedly installed, the first reduction gear 331 is meshed with the driving gear 311, and the second reduction gear 332 is meshed with the driven gear 321, so that the driving gear 311 drives the driven gear 321 to rotate through the first reduction gear 331 and the second reduction gear 332.

[0070] Preferably, the rotating assembly 32 further includes a bearing 322, the driven gear 321 is connected with the support 311 through the bearing 322, which can reduce the friction between the driven gear 321 and the support 311 during the rotation of the driven gear 321, and can provide a stable and smooth rotating support for the driven gear 321, avoiding the unstable rotation caused by uneven friction or slight jamming between parts.

[0071] Through the design of the first reduction gear 331 and the second reduction gear 332, when the driving gear 311 rotates, the power is transmitted to the driven gear through the first reduction gear 331 and the second reduction gear 332 in sequence, the multi-stage reduction structure can effectively reduce the rotating speed, and at the same time, the torque is amplified according to the transmission ratio, so as to realize the accurate control of the rotating speed of the driven gear 321, and further simulate the rotating speed of the overtaken vehicle 5 in different overtaking scenes, improving the accuracy and repeatability of the test.

[0072] As shown in Figure 1 In the embodiment, the driving assembly 31 further includes a support 312, a motor (not shown in the figure) and a driving shaft 313, the support 312 is installed on the first bracket 21 through the first connecting piece 24, the motor is installed on the support 312, the driving gear 311 is installed on the motor through the driving shaft 313, and the driven gear 321 is rotatably installed on the support 312, so that the motor can drive the driving gear 311 to rotate through the driving shaft 313, and further drive the driven gear 321 to rotate.

[0073] Preferably, the support 312 is formed with a support rod 3121, and the first reduction gear 331 and the second reduction gear 332 are coaxially installed on the support rod 3121, which reduces the vibration and deviation caused by different shafts, makes the power transmission more stable, reduces the wear between the gears, and prolongs the service life of the rotating assembly 32.

[0074] Preferably, the support 312 is further formed with a fixed shaft, and the support rod 3121 is connected with the fixed shaft, and the driven gear 321 is rotatably installed on the fixed shaft.

[0075] The support 312 is installed on the first support 21 through the first connecting piece 24, thereby providing a stable installation basis for the entire driving assembly 31; the motor is installed inside the support 312, thereby forming a compact structural layout and effectively saving space, and also playing a certain protective role for the motor, reducing the influence of external factors such as airflow, sundries, etc. on the motor; the motor is connected with the driving gear 311 through the driving shaft 313, thereby being able to efficiently transmit the power generated by the motor to the driving gear 311, reducing the energy loss in the power transmission process, ensuring that the driving assembly 31 can provide stable and strong power for the rotating assembly, so that the overtaken vehicle 5 can rotate stably and continuously according to the test requirements; secondly, the driven gear 321 is directly installed on the support 312 and connected with the overtaken vehicle 5, and this structural layout is compact, reducing the complexity of the system; at the same time, the support 312 provides stable support for the entire rotating assembly, so that the driven gear 321 remains stable during power transmission, reducing vibration and deviation, and improving the reliability and durability of the entire device.

[0076] The installation principle of the device: the overtaken vehicle 6 and the overtaken vehicle 5 are installed in the same way, and in this embodiment, the overtaken vehicle 5 is taken as an example for description. The overtaken vehicle 5 is installed on the driven gear 321, and the driven gear 321 is installed on the support 312 through the bearing 322; the driven gear 321 is engaged with the second reduction gear 332, the second reduction gear 332 and the first reduction gear 331 are coaxially installed on the support rod 3121 of the support 312, the first reduction gear 331 is engaged with the driving gear 311, the driving gear 311 is installed on the motor through the driving shaft 313, and the motor is installed in the support 312, so that when the motor drives the driving gear 311 to rotate, the driving gear 311 drives the driven gear 321 to rotate through the first reduction gear 331 and the second reduction gear 332, thereby driving the overtaken vehicle 5 to rotate. The support 312 is connected with the first support 21 through the first connecting piece 24, and then the overtaken vehicle 5 is installed on the balance rotating device 2 through the first support 21.

[0077] As Figures 5-10 and Figure 12As shown in this embodiment, a method for using an overtaking test device in a car wind tunnel is described above. The method includes the following steps: S01: The vehicle to be overtaken 5 and the overtaking vehicle 6 are respectively mounted on the balance rotating device 2 via the first vehicle rotating device 3 and the second vehicle rotating device 4. The front of the vehicle to be overtaken 5 and the front of the overtaking vehicle 6 face the wind tunnel 1, and the vehicle to be overtaken 5 is located directly in front of the overtaking vehicle 6; S02: The wind tunnel 1 is started. After the wind speed of the wind tunnel 1 reaches a preset value, the balance rotating device 2, the first vehicle rotating device 3 and the second vehicle rotating device 4 are synchronously driven to rotate until the overtaking vehicle 6 is located directly in front of the vehicle to be overtaken 5, the overtaking test is completed and the balance rotating device 2, the first vehicle rotating device 3 and the second vehicle rotating device 4 are turned off.

[0078] By mounting the overtaking vehicle 5 and the overtaking vehicle 6 on different rotating devices and placing them on the balance rotating device 2, and placing the vehicles in the wind tunnel 1 environment, the overtaking situation on the actual road can be simulated relatively realistically. The airflow provided by the wind tunnel 1 simulates the aerodynamic environment during driving. The first vehicle rotating device 3, the second vehicle rotating device 4, and the balance rotating device 2 can simulate the relative motion and position changes of the vehicles during the overtaking process, thus providing reliable experimental conditions for studying the aerodynamic characteristics during the overtaking process. Keeping the front of the vehicle always facing the nozzle of the wind tunnel 1 ensures that the direction of the airflow force on the overtaking vehicle 6 during the simulated overtaking process is relatively stable, avoiding airflow turbulence caused by changes in the direction of the vehicle's front, which would affect the accuracy of the aerodynamic data. Secondly, by clearly defining the procedure of first starting the wind tunnel 1 to reach the preset wind speed, then starting each rotating device, and continuing until the overtaking vehicle 6 is directly in front of the overtaken vehicle 5 to complete the test, the conditions of each test are relatively consistent, which can ensure the repeatability and comparability of the test results. This allows researchers to conduct multiple tests under the same conditions to obtain more accurate and reliable data, thereby conducting in-depth analysis of the impact of various factors on the aerodynamic performance of the vehicle during the overtaking process.

[0079] like Figures 5-9 As shown, in this embodiment, the balance rotating device 2, the first vehicle rotating device 3, and the second vehicle rotating device 4 rotate synchronously: when the balance rotating device 2 rotates 180° clockwise, the first vehicle rotating device 3 and the second vehicle rotating device 4 both rotate 180° counterclockwise, so that the front of the overtaken vehicle 5 and the front of the overtaking vehicle 6 remain facing the wind tunnel 1; when the balance rotating device 2 rotates 180° counterclockwise, the first vehicle rotating device 3 and the second vehicle rotating device 4 both rotate 180° clockwise, so that the front of the overtaken vehicle 5 and the front of the overtaking vehicle 6 remain facing the wind tunnel 1.

[0080] According to the above technical means, by synchronously driving the balance rotating device 2 to rotate 180° clockwise, the first vehicle rotating device 3 and the second vehicle rotating device 4 to rotate 180° counterclockwise, or the balance rotating device 2 to rotate 180° counterclockwise, the first vehicle rotating device 3 and the second vehicle rotating device 4 to rotate 180° clockwise, and keeping the front of the overtaken vehicle 5 and the front of the overtaking vehicle 6 facing the wind tunnel 1, the relative position change of the vehicles during overtaking is simulated, the driving direction of the vehicles is kept consistent with the airflow direction, and the complex dynamic process of overtaking is successfully reproduced.

[0081] As shown in Figure 11 the embodiment, the method for force analysis of the automobile wind tunnel overtaking test device also includes the following steps: when the balance rotating device 2 rotates, the aerodynamic force and moment of the overtaken vehicle 5 and the overtaking vehicle 6 from the airflow of the wind tunnel 1 in the balance coordinate system are obtained through the force sensor; S20: according to the angle of the balance rotating device 2 and the aerodynamic force and moment of the overtaken vehicle 5 and the overtaking vehicle 6 from the airflow of the wind tunnel 1 in the balance coordinate system at the angle, the aerodynamic force and moment of the overtaken vehicle 5 and the overtaking vehicle 6 in the wind tunnel coordinate system are obtained; S30: the aerodynamic force and moment of the overtaken vehicle 5 and the overtaking vehicle 6 in the wind tunnel coordinate system are analyzed, the relationship between the aerodynamic characteristics and the control stability of the overtaking vehicle 6 in the overtaking process is judged, and the vehicle performance is optimized.

[0082] Preferably, the balance rotating device 2 adopts a mechanical six-component force balance, and the overtaken vehicle 5 and the overtaking vehicle 6 are connected to the two independent mechanical six-component force balances through the first support 21 and the second support 22, so that the aerodynamic force of the overtaken vehicle 5 and the overtaking vehicle 6 during the wind tunnel test can be transmitted to the mechanical six-component force balance in real time, and the six-component force collection is completed.

[0083] The six-component force includes force and moment perpendicular to the direction of the rotating platform body 23, force and moment parallel to the direction of the moving belt 231, and force and moment perpendicular to the direction of the moving belt 231; as shown in Figure 2 the direction parallel to the moving belt 231 is defined as the X-axis of the balance coordinate system, the direction perpendicular to the moving belt 231 is defined as the Y-axis of the balance coordinate system, and the direction perpendicular to the rotating platform body 23 is defined as the Z-axis of the balance coordinate system (not marked in the figure). Since the balance rotating device 2 is rotating around the Z-axis at any time, the X-axis and the Y-axis in the balance coordinate system are also changing at any time, and the directions of the X-axis and the Y-axis are also changing at any time, which is not conducive to analyzing the influence of the aerodynamic force on the vehicle stability; therefore, it is necessary to convert the collected six-component force into aerodynamic force in a stable coordinate system, so as to facilitate the analysis of the influence of the aerodynamic force on the vehicle stability, and thus optimize the vehicle performance.

[0084] The stable coordinate system includes a direction along the body of the test vehicle, a direction perpendicular to the body of the test vehicle, and a direction perpendicular to the ground; as shown in Figure 6 the direction along the body of the test vehicle is defined as the X' axis of the wind tunnel coordinate system, the direction perpendicular to the body of the test vehicle is defined as the Y' axis of the wind tunnel coordinate system, and the direction perpendicular to the ground is defined as the Z' axis of the wind tunnel coordinate system (not labeled in the figure).

[0085] As shown in Figure 6 the specific process of the conversion force is as follows:

[0086] F x′ = F x cos θ + F y sin θ

[0087] F y′ = -F x sin θ + F y cos θ

[0088] F z′ = F z

[0089] wherein F x′ is the aerodynamic force of the overtaken vehicle 5 or the overtaking vehicle 6 on the X' axis of the wind tunnel coordinate system, F y′ is the aerodynamic force of the overtaken vehicle 5 or the overtaking vehicle 6 on the Y' axis of the wind tunnel coordinate system, F z′ is the aerodynamic force of the overtaken vehicle 5 or the overtaking vehicle 6 on the Z' axis of the wind tunnel coordinate system, F x is the aerodynamic force of the overtaken vehicle 5 or the overtaking vehicle 6 on the X axis of the balance coordinate system, F y is the aerodynamic force of the overtaken vehicle 5 or the overtaking vehicle 6 on the Y axis of the balance coordinate system, F z is the aerodynamic force of the overtaken vehicle 5 or the overtaking vehicle 6 on the Z axis of the balance coordinate system, and θ is the angle of rotation of the balance rotating device 2.

[0090] The specific process of the conversion moment is as follows:

[0091] M x′ = M x cos θ + M y sin θ

[0092] M y′ = -M x sin θ + M y cos θ

[0093] M z′ = M z

[0094] wherein M x′M is the aerodynamic moment of the overtaken vehicle 5 or the overtaking vehicle 6 on the X' axis in the wind tunnel coordinate system y′ M is the aerodynamic moment of the overtaken vehicle 5 or the overtaking vehicle 6 on the Y' axis in the wind tunnel coordinate system z′ M is the aerodynamic moment of the overtaken vehicle 5 or the overtaking vehicle 6 on the Z' axis in the wind tunnel coordinate system x M is the aerodynamic moment of the overtaken vehicle 5 or the overtaking vehicle 6 on the X axis in the balance coordinate system y M is the aerodynamic moment of the overtaken vehicle 5 or the overtaking vehicle 6 on the Y axis in the balance coordinate system z M is the aerodynamic moment of the overtaken vehicle 5 or the overtaking vehicle 6 on the Z axis in the balance coordinate system, and θ is the angle of rotation of the balance rotating device 2.

[0095] Preferably, the vehicle performance includes vehicle handling stability, ride comfort, fuel economy and vehicle appearance. Through the appearance inspection before the test, the original state of the vehicle appearance can be recorded in detail, and the appearance change after the wind tunnel test can be compared, which can more accurately find the subtle influence of airflow on the vehicle, such as local deformation, paint wear, etc., which helps to more accurately correct the numerical model of the vehicle and improve the accuracy of numerical simulation, so as to more effectively optimize the aerodynamic shape of the vehicle in subsequent design.

[0096] The aerodynamic force and moment of the overtaken vehicle 5 and the overtaking vehicle 6 in the balance coordinate system are directly obtained through the force sensor in the balance rotating device 2, and then the aerodynamic force and moment of the overtaken vehicle 5 and the overtaking vehicle 6 in the wind tunnel coordinate system are obtained by combining the rotation angle of the balance rotating device 2. Since the balance coordinate system is relatively fixed relative to the test device itself, external interference can be effectively reduced in this coordinate system, so that the aerodynamic force and moment obtained in the balance coordinate system are more accurate, providing a reliable data basis for subsequent analysis; by analyzing the aerodynamic force and moment of the overtaken vehicle 5 and the overtaking vehicle 6 in the wind tunnel coordinate system, the influence of the aerodynamic force received at different relative positions on the vehicle stability and handling is obtained, and the vehicle performance is optimized.

[0097] Working principle: the positions of the overtaken vehicle 5 and the overtaking vehicle 6 after installation are shown in Figure 2 , the balance rotating device 2 is first rotated counterclockwise by 90°, the first vehicle rotating device 3 and the second vehicle rotating device 4 are controlled to rotate clockwise by 90°, so that the front of the overtaken vehicle 5 and the front of the overtaking vehicle 6 are opposite the wind tunnel 1 wind port, at this time, the overtaking vehicle 6 is located directly behind the overtaken vehicle 5 (as shown in Figure 5(As shown). At the start of the test, once the wind speed in wind tunnel 1 reaches the set wind speed, the balance rotating device 2 is rotated clockwise. Simultaneously, the overtaken vehicle 5 and the overtaking vehicle 6 are remotely controlled to rotate counterclockwise, ensuring that the front ends of both vehicles are always directly facing the wind tunnel nozzle. The angles of the balance rotating device 2 and the rotation angles of the overtaken vehicles 5 and 6 are consistent. The balance rotating device 2 and the rotation angles of the overtaken vehicles 5 and 6... Figures 5-9 The state changes, the balance rotating device 2 rotates by 180°, and the overtaken vehicle 5 and the overtaking vehicle 6 rotate by 180°. At this time, the overtaking vehicle 6 is directly in front of the overtaken vehicle 5 (e.g., Figure 9 (As shown). During the test, the positional changes of the overtaking vehicle 6 relative to the overtaken vehicle 5 were as follows: Figure 10 As shown, the overtaking vehicle 6 completed overtaking the overtaken vehicle 5. During the rotation of the balance rotating device 2, the force sensor can directly detect the six-component force in the balance coordinate system, and the host computer converts the six-component force in the balance coordinate system into the six-component force in the stable wind tunnel coordinate system. Then, the impact of the six-component force in the wind tunnel coordinate system on the vehicle stability is judged, thereby optimizing vehicle performance and reducing the impact of aerodynamic forces on vehicle stability.

[0098] The above embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention.

Claims

1. An overtaking test device in a motor vehicle wind tunnel, characterized in that The wind tunnel (1), the balance rotating device (2), the first vehicle rotating device (3), the second vehicle rotating device (4), the overtaken vehicle (5) and the overtaking vehicle (6), the balance rotating device (2) is installed at the air outlet of the wind tunnel (1); The balance rotating device (2) is configured to rotate clockwise or counterclockwise, the overtaken vehicle (5) and the overtaking vehicle (6) are installed on the balance rotating device (2), so that the balance rotating device (2) can drive the overtaken vehicle (5) and the overtaking vehicle (6) to rotate, so as to exchange the relative front and rear positions of the overtaken vehicle (5) and the overtaking vehicle (6); The overtaken vehicle (5) is installed on the balance rotating device (2) through the first vehicle rotating device (3), the overtaking vehicle (6) is installed on the balance rotating device (2) through the second vehicle rotating device (4), and the first vehicle rotating device (3) and the second vehicle rotating device (4) can drive the overtaken vehicle (5) and the overtaking vehicle (6) to rotate counterclockwise or clockwise respectively; The first vehicle rotating device (3) and the second vehicle rotating device (4) are configured to rotate at the same speed as the balance rotating device (2) and in the opposite direction, so that the front of the overtaken vehicle (5) and the front of the overtaking vehicle (6) remain facing the wind tunnel (1). The balance rotating device (2) includes a first support (21), a second support (21) and a rotating platform body (23), the first vehicle rotating device (3) is supported on the rotating platform body (23) through the first support (21), and the second vehicle rotating device (4) is supported on the rotating platform body (23) through the second support (21), so that the rotating platform body (23) drives the overtaken vehicle (5) and the overtaking vehicle (6) to rotate clockwise or counterclockwise, and the overtaken vehicle (5) and the overtaking vehicle (6) can be driven by the first vehicle rotating device (3) and the second vehicle rotating device (4) to rotate counterclockwise or clockwise, so as to realize that the front of the overtaken vehicle (5) and the front of the overtaking vehicle (6) always face the wind tunnel (1) and complete the relative position exchange.

2. The device according to claim 1, wherein Force sensors are installed on the first support (21) and the second support (21), and the force sensors are used to detect the aerodynamic force and torque received by the overtaken vehicle (5) and the overtaking vehicle (6).

3. The device according to claim 2, wherein The first vehicle rotating device (3) includes a driving assembly (31), a rotating assembly (32) and a transmission assembly (33), the driving assembly (31) is installed on the first support (21) through a first connecting piece (24); the driving assembly (31) is connected with the rotating assembly (32) through the transmission assembly (33) to drive the rotating assembly (32) to rotate; and the overtaken vehicle (5) is installed on the rotating assembly (32).

4. The device according to claim 2, wherein ​ 5. A device for testing the overtaking maneuver in a wind tunnel according to claim 4, characterized in that The driving assembly (31) comprises a driving gear (311), the rotating assembly (32) comprises a driven gear (321), the transmission assembly (33) is a gear set, the driving gear (311) is engaged with the transmission assembly (33), and the transmission assembly (33) is engaged with the driven gear (321); the overtaken vehicle (5) is installed on the driven gear (321).

6. A device for testing the overtaking of a vehicle in a wind tunnel, according to claim 5, characterized in that, The transmission assembly (33) comprises a first reduction gear (331) and a second reduction gear (332), and the first reduction gear (331) and the second reduction gear (332) are coaxially fixedly installed; the first reduction gear (331) is engaged with the driving gear (311), and the second reduction gear (332) is engaged with the driven gear (321).

7. The device for testing passing of vehicles in a wind tunnel according to claim 5, characterized in that, The driving assembly (31) further comprises a support (312), a motor and a driving shaft (313), the support (312) is installed on the first support (21) through a first connecting piece (24), the motor is installed on the support (312), and the driving gear (311) is installed on the motor through the driving shaft (313); the driven gear (321) is rotatably installed on the support (312).

8. A method of using a passing test device in an automotive wind tunnel, the method comprising: The device of any one of claims 1-7, the method comprising the following steps: S01: the overtaken vehicle (5) and the overtaking vehicle (6) are installed on the balance rotating device (2) through the first vehicle rotating device (3) and the second vehicle rotating device (4) respectively, the heads of the overtaken vehicle (5) and the overtaking vehicle (6) face the wind tunnel (1), and the overtaken vehicle (5) is located in front of the overtaking vehicle (6); S02: the wind tunnel (1) is started, after the wind speed of the wind tunnel (1) reaches a preset value, the balance rotating device (2), the first vehicle rotating device (3) and the second vehicle rotating device (4) are started to rotate until the overtaking vehicle (6) is located in front of the overtaken vehicle (5), the overtaking test is completed, and the balance rotating device (2), the first vehicle rotating device (3) and the second vehicle rotating device (4) are closed.

9. The use of a passing test device in a motor vehicle wind tunnel according to claim 8, characterized in that The balance rotating device (2), the first vehicle rotating device (3) and the second vehicle rotating device (4) are synchronously rotated: When the balance rotating device (2) rotates clockwise by 180°, the first vehicle rotating device (3) and the second vehicle rotating device (4) rotate counterclockwise by 180°, so that the heads of the overtaken vehicle (5) and the overtaking vehicle (6) keep facing the wind tunnel (1); When the balance rotating device (2) rotates counterclockwise by 180°, the first vehicle rotating device (3) and the second vehicle rotating device (4) rotate clockwise by 180°, so that the heads of the overtaken vehicle (5) and the overtaking vehicle (6) keep facing the wind tunnel (1).

10. A method for analyzing the force of a passing test device in an automobile wind tunnel, characterized by, The device of claim 3, the method comprising the following steps: S10: When the balance rotating device (2) rotates, the aerodynamic force and moment of the overtaken vehicle (5) and the overtaking vehicle (6) in the wind tunnel (1) airflow in the balance coordinate system are obtained by each force sensor respectively; S20: According to the angle of rotation of the balance rotating device (2) and the aerodynamic force and moment of the overtaken vehicle (5) and the overtaking vehicle (6) in the balance coordinate system under the angle, the aerodynamic force and moment of the overtaken vehicle (5) and the overtaking vehicle (6) in the wind tunnel coordinate system are obtained; S30: Analyze the aerodynamic force and moment of the overtaken vehicle (5) and the overtaking vehicle (6) in the wind tunnel coordinate system, judge the relationship between the aerodynamic characteristics and the control stability of the overtaking vehicle (6) in the overtaking process, and optimize the vehicle performance.

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