Overtaking test device in automobile wind tunnel and use and stress analysis method thereof

Abstract

The invention relates to an overtaking test device in an automobile wind tunnel and a using and stress analysis method thereof, the overtaking test device 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 a force measuring sensor is arranged in the balance rotating device; an overtaken vehicle and an overtaking vehicle are installed on the independent force measuring sensors of the balance rotating device through the first vehicle rotating device and the second vehicle rotating device respectively, and the first vehicle rotating device and the second vehicle rotating device can drive the overtaken vehicle and the overtaking vehicle to rotate anticlockwise or clockwise respectively. The balance rotating device is configured to rotate clockwise or anticlockwise, so that the balance rotating device can drive the overtaken vehicle and the overtaking vehicle to rotate, and the relative front and back positions of the overtaken vehicle and the overtaking vehicle are exchanged. According to the invention, the relative positions and orientations of the two vehicles can be flexibly adjusted.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle testing, and in particular to an overtaking test device in an automobile wind tunnel and a use and force analysis method thereof. Background Art

[0002] When a vehicle is driving, aerodynamic force will generate lateral force. If the aerodynamic design of the vehicle is unreasonable and the lateral force is too large, the directional stability of the vehicle will be seriously affected, which will cause the vehicle's driving route to deviate. The driver needs to constantly correct the direction to keep driving straight, which increases the difficulty and fatigue of driving. Secondly, when the vehicle is driving, aerodynamic force will also generate lift or downforce. For general vehicles, 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 drive according to the driver's operation. If the lift is too large, it will cause the tire adhesion to decrease, causing the vehicle to float, the directional stability to deteriorate, and even the risk of losing control when driving at high speed. Therefore, it is necessary to test and optimize the aerodynamic force on the vehicle to improve the power economy and handling stability of the vehicle during driving.

[0003] Therefore, with the continuous improvement of the automotive industry's requirements for aerodynamic performance, wind tunnel testing has become a core means of evaluating vehicle aerodynamic characteristics. Traditional wind tunnel testing focuses on the analysis of aerodynamic characteristics of a single vehicle under steady-state conditions, and obtains aerodynamic load data of the vehicle under specific wind speeds and yaw angles through a fixed test bench. However, in actual road driving, vehicles are often in a dynamic interactive state, especially in overtaking conditions, where the high-speed change in the relative position of the two vehicles will cause complex transient aerodynamic interference effects. However, common overtaking tests are usually simulated using virtual simulations, but virtual simulations will simplify the vehicle dynamics model, resulting in a gap between the calculated data and the actual data.

[0004] Conventional wind tunnels are limited by the fixed test bench structure and compact space, and cannot be designed with a traction track to simulate the continuous change of the relative position of the two vehicles. Although some advanced wind tunnels have introduced a mobile arm system, its degree of freedom of movement is mostly limited to a single axial translation, making it difficult to reproduce the spatial coupling characteristics of the two vehicle trajectories during overtaking. In addition, the overall fixed structure is exposed to the airflow, which has a great impact on the aerodynamic measurement of the test vehicle. Summary of the invention

[0005] The invention provides an automobile overtaking test device in a wind tunnel and a use and force analysis method thereof, so as to solve the problem that the existing wind tunnel cannot simulate the relative position change of two vehicles.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] An automobile overtaking test device in a wind tunnel comprises: a wind tunnel, a balance rotating device, a first vehicle rotating device, a second vehicle rotating device, a vehicle to be overtaken and a vehicle to overtake, wherein the balance rotating device is installed at the air outlet of the wind tunnel; the balance rotating device is configured to be able to rotate clockwise or counterclockwise, the vehicle to be overtaken and the vehicle to overtake are both installed on the balance rotating device, so that the balance rotating device can drive the vehicle to be overtaken and the vehicle to overtake to rotate, so as to exchange the relative front and rear positions of the vehicle to be overtaken and the vehicle to overtake; the vehicle to be overtaken The first vehicle rotating device is installed on the balance rotating device, and 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 respectively drive the overtaken vehicle and the overtaking vehicle to rotate counterclockwise or clockwise; 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 opposite directions, so that the front ends of the overtaken vehicle and 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 directions can be flexibly adjusted, so that the front of the overtaken vehicle and the front of the overtaking vehicle always keep facing forward. Since the first vehicle rotating device can drive the overtaken vehicle to rotate and the second vehicle rotating device can drive the overtaking vehicle to rotate, and the two are consistent with the rotation speed of the balance rotating device, the consistency of the test conditions can be ensured, and it is ensured that during the simulated overtaking process, the driving posture of the vehicle is consistent with the actual situation, thereby improving the accuracy of the test results; secondly, the wind tunnel provides wind force to simulate the aerodynamic environment when the vehicle is driving, 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, which can more realistically simulate the overtaking process on the actual road and provide a basis for studying the aerodynamic characteristics during the overtaking process.

[0009] Furthermore, the balance rotating device includes a first bracket, a second bracket and a turntable body, the first vehicle rotating device is supported on the turntable body through the first bracket, and the second vehicle rotating device is supported on the turntable body through the second bracket, so that when the turntable body drives the overtaken vehicle and the overtaking vehicle to rotate clockwise or counterclockwise, the overtaken vehicle and the overtaking vehicle can rotate counterclockwise or clockwise under the drive of the first vehicle rotating device and the second vehicle rotating device, thereby achieving that the front of the overtaken vehicle and the front of the overtaking vehicle are always facing the wind tunnel and complete the relative position exchange.

[0010] According to the above technical means, the overtaken vehicle and the overtaking vehicle are connected to the balance rotating device through the first bracket and the second bracket respectively, which ensures the stability of the connection between the overtaken vehicle and the overtaking vehicle and the balance rotating device respectively, and can withstand the wind tunnel wind force and various forces generated by the rotation of the vehicle during the test; and 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 vehicles themselves to rotate in the opposite direction, accurately simulating the changes in the vehicle's motion state during the actual overtaking process, and can provide a real and reliable test scenario for related research such as automotive aerodynamics and vehicle dynamics.

[0011] Furthermore, force sensors are installed on both the first bracket and the second bracket, and the force sensors are used to detect the aerodynamic force and torque exerted on 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 exerted on the overtaken vehicle and the overtaking vehicle in the wind tunnel test can be directly measured, and the aerodynamic forces such as wind resistance and roll force exerted on the vehicle at different relative positions can be accurately understood, providing a basis for the stability and controllability of the vehicle.

[0013] Furthermore, the first vehicle rotating device includes a driving assembly, a rotating assembly and a transmission assembly, the driving assembly is installed on the first bracket through a first connecting member; the driving assembly is connected to the rotating assembly through the transmission assembly to drive the rotating assembly to rotate; the overtaken vehicle is installed on the rotating assembly.

[0014] According to the above technical means, the driving component is connected to the rotating component through the transmission component, and can transmit power from the outside to the rotating component, providing a power source for the rotation of the overtaken vehicle, ensuring that the overtaken vehicle can rotate according to the test requirements during the test; and the first vehicle rotating device is divided into a driving component and a rotating component. When the device fails or needs to be upgraded and maintained, it is convenient to check, repair or replace each component separately, which reduces the maintenance cost and difficulty and increases the service life of the device.

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

[0016] According to the above technical means, the power of the driving gear can be effectively transmitted to the driven gear through the meshing between the driving gear, the gear set and the driven gear, thereby realizing the transmission of power from the driving component to the rotating component, completing the conversion of the motion form, and enabling the overtaken vehicle to obtain the power of rotation; and the gear transmission has a high transmission accuracy, so that the meshing relationship between the gears is relatively stable, and a more precise transmission ratio between the driving gear and the driven gear can be guaranteed, thereby making the rotation of the overtaken vehicle more stable and predictable, and reducing motion errors and uncertainties; secondly, the existence of the gear set can realize the adjustment of the speed and torque according to its different tooth ratios, so as to meet the specific needs of the overtaken vehicle to rotate at different speeds.

[0017] Furthermore, the transmission assembly includes 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 meshed with the driving gear, and the second reduction gear is meshed 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 sequence, and the multi-stage reduction structure can effectively reduce the rotation speed. At the same time, the torque is amplified according to the transmission ratio, and the rotation speed of the driven gear can be accurately controlled, thereby simulating the rotation speed of the overtaken vehicle in different overtaking scenarios, thereby improving the accuracy and repeatability of the test.

[0019] Furthermore, the driving assembly also includes a support, a motor and a driving shaft, the support is mounted on the first bracket via a first connecting member, the motor is mounted on the support, and the driving gear is mounted on the motor via the driving shaft; the driven gear is rotatably mounted on the support.

[0020] According to the above technical means, the support is installed on the first bracket through the first connecting member, providing a stable installation foundation for the entire drive assembly; the motor is installed inside the support, forming a compact structural layout, effectively saving space, and also playing a certain protective role for the motor, reducing the impact of external factors such as airflow and debris on the motor; the motor is connected to the driving gear through the drive shaft, and can efficiently transmit the power generated by the motor to the driving gear, reducing the energy loss during power transmission, and ensuring that the drive assembly can provide stable and strong power to the rotating assembly, so that the overtaken vehicle can rotate stably and continuously according to the test requirements; secondly, the driven gear is directly installed on the support and connected to the overtaken vehicle. This structural layout is compact, reduces additional connecting components, and reduces 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] Furthermore, it also includes a method for using an overtaking test device in a car wind tunnel, using the device, and the method includes the following steps: S01: installing 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, with the front of the overtaken vehicle and the front of the overtaking vehicle facing the wind tunnel, and the overtaken vehicle is located directly in front of the overtaking vehicle; S02: starting the wind tunnel, and 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 directly in front of the overtaken vehicle, completing the overtaking test and closing 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 placing 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, and the first vehicle rotating device, the second vehicle rotating device and the balance rotating device can simulate the relative movement and position change of the vehicle during the overtaking process, thereby providing reliable experimental conditions for studying the aerodynamic characteristics during the overtaking process; keeping the front of the vehicle always facing the wind tunnel nozzle, so that the direction of the airflow force on the vehicle during the simulated overtaking process is relatively stable, avoiding airflow turbulence caused by the change of the front direction of the vehicle, affecting the accuracy of the aerodynamic data. Secondly, by clearly stipulating the process of first starting the wind tunnel to make the wind speed reach the preset value, then starting each rotating device, and completing the test until the overtaking vehicle is located directly 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 enable researchers to conduct multiple tests under the same conditions to obtain more accurate and reliable data, so as to deeply analyze the influence of various factors on the aerodynamic performance of the vehicle during the overtaking process.

[0023] Further, the balance rotation device, the first vehicle rotation device and the second vehicle rotation device rotate synchronously: when the balance rotation device rotates 180° clockwise, the first vehicle rotation device and the second vehicle rotation device both rotate 180° counterclockwise, so that the front of the overtaken vehicle and the front of the overtaking vehicle remain facing the wind tunnel; when the balance rotation device rotates 180° counterclockwise, the first vehicle rotation device and the second vehicle rotation device both rotate 180° clockwise, so that the front of the overtaken vehicle and the front of the overtaking vehicle remain facing the wind tunnel.

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

[0025] Furthermore, it also includes a force analysis method for an overtaking test device in a car wind tunnel, using the device, the method includes the following steps: S10: when the balance rotating device is rotating, the aerodynamic force and torque of the overtaken vehicle and the overtaking vehicle from the wind tunnel airflow in the balance coordinate system are respectively obtained through the force sensor; S20: according to the rotation angle of the balance rotating device and the aerodynamic force and torque of the overtaken vehicle and the overtaking vehicle from the wind tunnel airflow in the balance coordinate system at this angle, the aerodynamic force and torque of the overtaken vehicle and the overtaking vehicle in the wind tunnel coordinate system are obtained; S30: analyzing the aerodynamic force and torque of the overtaken vehicle and the overtaking vehicle in the wind tunnel coordinate system, judging the relationship between the aerodynamic characteristics and handling stability of the overtaking vehicle during the overtaking process, so as to optimize vehicle performance.

[0026] According to the above technical means, the aerodynamic force and torque of the overtaken vehicle and the overtaking vehicle in the balance coordinate system are directly obtained through the force measuring sensor in the balance rotating device, and then combined with the rotation angle of the balance rotating device, the aerodynamic force and torque of the overtaken vehicle and the overtaking vehicle in the wind tunnel coordinate system are obtained through coordinate system conversion. Since the balance coordinate system is relatively fixed relative to the test device itself, the external interference can be effectively reduced in this coordinate system, making the aerodynamic force and torque obtained in the balance coordinate system more accurate, providing a reliable data basis for subsequent analysis; by analyzing the aerodynamic force and torque of the overtaken vehicle and the overtaking vehicle in the wind tunnel coordinate system, the influence of the aerodynamic force at different relative positions on the vehicle stability and maneuverability is obtained, thereby optimizing the vehicle performance.

[0027] Beneficial effects of the present invention:

[0028] 1. 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 directions can be flexibly adjusted, so that the front of the overtaken vehicle and the front of the overtaking vehicle always keep facing forward. Since the first vehicle rotating device can drive the overtaken vehicle to rotate and the second vehicle rotating device can drive the overtaking vehicle to rotate, and the two keep the same rotation speed as the balance rotating device, the consistency of the test conditions can be ensured, ensuring that the driving posture of the vehicle is in line with the actual situation during the simulated overtaking process, thereby improving the accuracy of the test results.

[0029] 2. The wind tunnel provides wind to simulate the aerodynamic environment of the vehicle while driving, and the balance rotation device is used to achieve the exchange of the relative front and rear positions of the overtaken vehicle and the overtaking vehicle. This can more realistically simulate the overtaking process on the actual road and provide a basis for studying the aerodynamic characteristics during the overtaking process. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1It is an exploded view of the present invention;

[0031] Figure 2 A top view of the balance rotating device of the present invention;

[0032] Figure 3 It is a schematic diagram of the connection between the first bracket, the first vehicle rotating device and the overtaken vehicle of the present invention;

[0033] Figure 4 It is a schematic diagram of the connection between the second bracket, the second vehicle rotating device and the overtaking vehicle of the present invention;

[0034] Figure 5 Schematic diagram of the initial positions of the overtaken vehicle and the overtaking vehicle of the present invention;

[0035] Figure 6 This is a schematic diagram of an overtaking vehicle of the present invention being located behind the vehicle being overtaken;

[0036] Figure 7 It is a schematic diagram of the present invention when the overtaken vehicle and the overtaking vehicle are parallel to each other;

[0037] Figure 8 This is a schematic diagram of an overtaking vehicle in the present invention being located in front of the overtaken vehicle;

[0038] Fig. 9 It is a schematic diagram of the overtaken vehicle and the overtaking vehicle after completing overtaking according to the present invention;

[0039] Fig.10 A schematic diagram of the relative position change between the overtaken vehicle and the overtaking vehicle of the present invention;

[0040] Fig.11 It is a flow chart of the force analysis method in the present invention;

[0041] Fig.12 It is a flow chart of the use of the device in the present invention.

[0042] Reference numerals:

[0043] 1- Wind tunnel;

[0044] 2-balance rotating device; 21-first bracket; 22-second bracket; 23-turntable body; 231-moving belt; 24-first connecting member; 25-second connecting member;

[0045] 3-first vehicle rotating device; 31-driving assembly; 311-driving gear; 312-support; 3121-support rod; 313-driving shaft; 32-rotating 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 drawings are only used for illustrative purposes and should not be construed as limitations on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The same or similar numbers correspond to the same or similar parts. The terms describing the positional relationship in the drawings are only used for illustrative purposes and should not be construed as limitations on this patent. DETAILED DESCRIPTION

[0048] The following will describe the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0049] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0050] In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0051] In the embodiments of the present application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0052] In the embodiments of the present application, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0053] like Figure 1-Figure 4 As shown, in this embodiment, a vehicle wind tunnel overtaking test device is provided, comprising: a wind tunnel 1, a balance rotating device 2, a first vehicle rotating device 3, a second vehicle rotating device 4, a vehicle to be overtaken 5 and a vehicle to overtake 6, wherein the balance rotating device 2 is installed at the air outlet of the wind tunnel 1, as shown in FIG. Figure 2 As shown, the direction indicated by the arrow is the direction of the wind flow in the wind tunnel 1, so that the wind tunnel 1 provides wind force to the balance rotating device 2; the balance rotating device 2 is configured to be able to rotate clockwise or counterclockwise, and the overtaken vehicle 5 and the overtaking vehicle 6 are both 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, and 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 respectively drive the overtaken vehicle 5 and the overtaking vehicle 6 to rotate counterclockwise or clockwise; the first vehicle rotating device 3 and the second vehicle rotating device 4 are configured to have the same rotation speed as the rotation speed of the balance rotating device 2 and the opposite rotation direction, so that the front of the overtaken vehicle 5 and the front of the overtaking vehicle 6 remain facing the wind tunnel 1.

[0054] The overtaken vehicle 5 is mounted on the balance rotating device 2 through the first vehicle rotating device 3, and the overtaking vehicle 6 is mounted on the balance rotating device 2 through the second vehicle rotating device 4, and the balance rotating device 2 is mounted at the air outlet of the wind tunnel 1, so that the overtaken vehicle 5 and the overtaking vehicle 6 on the balance rotating device 2 can be subjected to the aerodynamic force and torque 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 overtaken vehicle 5 and the overtaking vehicle 6 to rotate clockwise, while the first vehicle rotating device 4 drives the overtaken vehicle 5 and the overtaking vehicle 6 to rotate clockwise. 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, thereby adjusting the directions of the front ends of the overtaken vehicle 5 and the overtaking vehicle 6 to ensure that the front ends of the overtaken vehicle 5 and the overtaking vehicle 6 are consistently facing the wind tunnel 1, and it is necessary to ensure that the rotation speed efficiency of the balance rotating device 2, the first vehicle rotating device 3 and the second vehicle rotating device 4 is consistent; until the balance rotating device 2, the first vehicle rotating device 3 and the second vehicle rotating device 4 are all rotated 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, while the balance rotating device 2 drives the overtaken vehicle 5 and the overtaking vehicle 6 to rotate counterclockwise, 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 clockwise. It is still necessary to keep the rotation speed consistent and the front of the vehicle facing forward so that the front of the vehicle is always facing the air outlet of the wind tunnel 1.

[0056] By combining the balance rotating device 2, the first vehicle rotating device 3 and the second vehicle rotating device 4, the relative positions of the overtaken vehicle 5 and the overtaking vehicle 6 and their directions can be flexibly adjusted, so that the front of the overtaken vehicle 5 and the overtaking vehicle 6 always keep facing forward. Since the first vehicle rotating device 3 can drive the overtaken vehicle 5 to rotate and the second vehicle rotating device 4 can drive the overtaking vehicle 6 to rotate, and the two keep the same rotation speed as the balance rotating device 2, the consistency of the test conditions can be ensured, and it is ensured that during the simulated overtaking process, the driving posture of the vehicle conforms to the actual situation, thereby improving the accuracy of the test results; secondly, the wind tunnel 1 provides the aerodynamic environment when the wind simulates the vehicle driving, and the balance rotating device 2 is used to realize the relative front and rear positions of the overtaken vehicle 5 and the overtaking vehicle 6. It can more realistically simulate the overtaking process on the actual road, providing a basis for studying the aerodynamic characteristics during the overtaking process.

[0057] like Figure 2-Figure 4As shown, in this embodiment, the balance rotating device 2 includes a first bracket 21, a second bracket 22 and a turntable body 23. The first vehicle rotating device 3 is supported on the turntable body 23 through the first bracket 21, and the second vehicle rotating device 4 is supported on the turntable body 23 through the second bracket 22, so that when the turntable body 23 drives the overtaken vehicle 5 and the overtaking vehicle 6 to rotate clockwise or counterclockwise, the overtaken vehicle 5 and the overtaking vehicle 6 can rotate counterclockwise or clockwise under the drive of the first vehicle rotating device 3 and the second vehicle rotating device 4, so that the front of the overtaken vehicle 5 and the overtaking vehicle 6 are always facing the wind tunnel 1 and the relative position exchange is completed.

[0058] Preferably, Figure 3 and Figure 4 As shown, the balance rotating device 2 further includes a first connecting member 24 and a second connecting member 25 . The first vehicle rotating device 3 is connected to the first bracket 21 via the first connecting member 24 , and the second vehicle rotating device 4 is connected to the second bracket 22 via the second connecting member 25 .

[0059] Preferably, Figure 2 As shown, a moving belt 231 is also provided on the turntable body 23, and the moving belt 231 is used to simulate the ground on which the vehicle travels.

[0060] The overtaken vehicle 5 and the overtaking vehicle 6 are connected to the balance rotating device 2 through the first bracket 21 and the second bracket 22, respectively, to ensure the stability of the connection between the overtaken vehicle 5 and the overtaking vehicle 6 and the balance rotating device 2, and can withstand the wind force of the wind tunnel 1 and various forces generated by the rotation of the vehicles during the test; and 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 vehicles themselves to rotate in the opposite direction, accurately simulating the changes in the motion state of the vehicles during the actual overtaking process, and can provide a real and reliable test scene for related research such as automobile aerodynamics and vehicle dynamics.

[0061] In this embodiment, force sensors (not shown in the figure) are installed on both the first bracket 21 and the second bracket 21. The force sensors are used to detect the aerodynamic force and torque exerted on the overtaken vehicle 5 and the overtaking vehicle 6.

[0062] Preferably, the force sensor adopts a multi-dimensional force / torque sensor, which can simultaneously measure forces and torques in two or more directions, so that the aerodynamic force and torque exerted on the passive overtaking 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 both the first bracket 21 and the second bracket 21, the aerodynamic force and torque exerted on the overtaken vehicle 5 and the overtaking vehicle 6 in the wind tunnel test can be directly received, and the aerodynamic force exerted on the vehicles at different relative positions can be accurately understood, providing a basis for the stability and controllability of the vehicles.

[0064] like Figure 1 , Figure 3 and Figure 4 As shown, in this embodiment, the first vehicle rotating device 3 includes a driving component 31, a rotating component 32 and a transmission component 33. The driving component 31 is installed on the first bracket 21 through the first connecting member 24. The driving component 31 is connected to the rotating component 32 through the transmission component 33 to drive the rotating component 32 to rotate; the overtaken vehicle 5 is installed on the rotating component 32, so that when the driving component 31 drives the rotating component 32 to rotate, the rotating component 32 can drive the overtaken vehicle 5 to rotate during the rotation process.

[0065] Preferably, the second vehicle rotating device 4 has the same components and connection and installation methods as the first vehicle rotating device 3 .

[0066] The driving component 31 is connected to the rotating component 32 through the transmission component 33, and can transmit power from the outside to the rotating component 32, providing a power source for the rotation of the overtaken vehicle 5, ensuring that the overtaken vehicle 5 can rotate according to the test requirements during the test; and the first vehicle rotating device 3 is divided into the driving component 31 and the rotating component 32. When the device fails or needs to be upgraded and maintained, it is convenient to check, repair or replace each component separately, which reduces the maintenance cost and difficulty and increases the service life of the device.

[0067] like Figure 1 As shown, in this embodiment, the driving component 31 includes a driving gear 311, the rotating component 32 includes a driven gear 321, and the transmission component 33 is a gear set. The driving gear 311 is meshed with the transmission component 33, and the transmission component 33 is meshed with the driven gear 321, so that the driving gear 311 can drive the driven gear 321 to rotate through the transmission component 33; the overtaken 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 overtaken vehicle 5 to rotate.

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

[0069] like Figure 1 As shown, in this embodiment, the transmission assembly 33 includes 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 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 also includes a bearing 322, through which the driven gear 321 is connected to the support 311. During the rotation of the driven gear 321, the friction between the driven gear 321 and the support 311 can be reduced, and a stable and smooth rotation support can be provided for the driven gear 321, thereby avoiding the unstable rotation caused by uneven friction or slight jamming between components.

[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 rotation speed and amplify the torque according to the transmission ratio. The rotation speed of the driven gear 321 can be accurately controlled, thereby simulating the rotation speed of the overtaken vehicle 5 in different overtaking scenarios, thereby improving the accuracy and repeatability of the test.

[0072] like Figure 1 As shown, in this embodiment, the driving assembly 31 also 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 member 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 then drive the driven gear 321 to rotate.

[0073] Preferably, a support rod 3121 is formed on the support 312, 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 axes, makes the power transmission more stable, reduces the wear between the gears, and extends the service life of the rotating component 32.

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

[0075] The support 312 is installed on the first bracket 21 through the first connecting member 24, providing a stable installation foundation for the entire drive assembly 31; the motor is installed inside the support 312, forming a compact structural layout, effectively saving space, and also playing a certain protective role for the motor, reducing the impact of external factors such as airflow and debris on the motor; the motor is connected to the driving gear 311 through the driving shaft 313, and can efficiently transmit the power generated by the motor to the driving gear 311, reducing the energy loss during the power transmission process, ensuring that the drive 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 to the overtaken vehicle 5. This structural layout is compact, reduces additional connecting components, and reduces 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 the power transmission process, reduces vibration and deviation, and improves the reliability and durability of the entire device.

[0076] Installation principle of the device: The overtaking vehicle 6 and the overtaken vehicle 5 are installed in the same manner. 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 meshed with the second reduction gear 332, and the second reduction gear 332 and the first reduction gear 331 are coaxially installed on the support rod 3121 of the support 312, and the first reduction gear 331 is meshed with the driving gear 311, and 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 to the first bracket 21 through the first connecting member 24, and then the overtaken vehicle 5 is installed on the balance rotating device 2 through the first bracket 21.

[0077] like Figure 5-Figure 10 and Fig.12As shown, in this embodiment, a method for using an overtaking test device in a car wind tunnel is provided, and the above-mentioned device is used. The method comprises the following steps: S01: the overtaken vehicle 5 and the overtaking vehicle 6 are respectively mounted on the balance rotating device 2 through the first vehicle rotating device 3 and the second vehicle rotating device 4, the front of the overtaken vehicle 5 and the front of the overtaking vehicle 6 are facing the wind tunnel 1, and the overtaken vehicle 5 is located directly in front of the overtaking vehicle 6; S02: the wind tunnel 1 is started, and 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 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.

[0078] By installing the overtaken vehicle 5 and the overtaking vehicle 6 on different rotating devices respectively, 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 more realistically; the airflow provided by the wind tunnel 1 simulates the aerodynamic environment during driving, and the first vehicle rotating device 3, the second vehicle rotating device 4 and the balance rotating device 2 can simulate the relative movement and position change of the vehicles during the overtaking process, thereby 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 makes the direction of the airflow force on the overtaking vehicle 6 during the simulated overtaking process relatively stable, avoiding airflow turbulence caused by changes in the direction of the front of the vehicle, which affects the accuracy of the aerodynamic data. Secondly, by clearly stipulating the process of first starting the wind tunnel 1 to make the wind speed reach the preset value, and then starting each rotating device, and completing the test until the overtaking vehicle 6 is located directly in front of the overtaken vehicle 5, 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 deeply analyzing the impact of various factors on the aerodynamic performance of the vehicle during the overtaking process.

[0079] like Figure 5-Figure 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 while keeping the vehicle's driving direction consistent with the airflow direction, successfully reproducing the complex dynamic process of overtaking.

[0081] like Fig.11 As shown, in this embodiment, a force analysis method for an overtaking test device in a car wind tunnel is also included. The above-mentioned device is used, and the method includes the following steps: when the balance rotating device 2 rotates, the aerodynamic force and torque of the overtaken vehicle 5 and the overtaking vehicle 6 from the wind tunnel 1 airflow in the balance coordinate system are respectively obtained by the force sensor; S20: according to the rotation angle of the balance rotating device 2 and the aerodynamic force and torque of the overtaken vehicle 5 and the overtaking vehicle 6 from the wind tunnel 1 airflow in the balance coordinate system at this angle, the aerodynamic force and torque of the overtaken vehicle 5 and the overtaking vehicle 6 in the wind tunnel coordinate system are obtained; S30: the aerodynamic force and torque of the overtaken vehicle 5 and the overtaking vehicle 6 in the wind tunnel coordinate system are analyzed, and the relationship between the aerodynamic characteristics and the handling stability of the overtaking vehicle 6 during the overtaking process is determined to optimize the vehicle performance.

[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 respectively connected to two independent mechanical six-component force balances through the first bracket 21 and the second bracket 22, so that the aerodynamic forces exerted on 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, thereby completing the collection of the six-component force.

[0083] The six force components include the force and moment in the direction perpendicular to the turntable body 23, the force and moment in the direction parallel to the moving belt 231, and the force and moment in the direction perpendicular to the moving belt 231; Figure 2 As shown, 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 turntable body 23 is defined as the Z-axis of the balance coordinate system (not marked in the figure). Since the balance rotating device 2 rotates 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 then the pointing directions of the X-axis and the Y-axis are also changing at any time, which is not conducive to analyzing the influence of aerodynamic force on 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 aerodynamic force on vehicle stability, thereby optimizing vehicle performance.

[0084] The stable coordinate system includes the direction along the test vehicle body, the direction perpendicular to the test vehicle body, and the direction perpendicular to the ground; Figure 6 As shown, the direction along the test vehicle body is defined as the X' axis of the wind tunnel coordinate system, the direction perpendicular to the test vehicle body 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 marked in the figure).

[0085] like Figure 6 As shown in Figure 2, the specific process of conversion force is:

[0086] F x′ =F x cosθ+F y sinθ

[0087] F y′ =-F x sinθ+F y cosθ

[0088] F z′ =F z

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

[0090] The specific process of converting torque is:

[0091] M x′ =M x cosθ+M y sinθ

[0092] M y′ =-M x sinθ+M y cosθ

[0093] M z′ =M z

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

[0095] Preferably, the vehicle performance includes: vehicle handling stability, ride smoothness, fuel economy and vehicle appearance. Through the appearance inspection before the test, the original state of the vehicle appearance can be recorded in detail. By comparing the appearance changes after the wind tunnel test, the subtle effects of airflow on the vehicle, such as local deformation and paint wear, can be more accurately found. This helps to make more accurate corrections to the numerical model of the vehicle and improve the accuracy of the numerical simulation, so as to more effectively optimize the aerodynamic shape of the vehicle in the subsequent design.

[0096] The aerodynamic force and torque 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 combined with the rotation angle of the balance rotating device 2, the aerodynamic force and torque of the overtaken vehicle 5 and the overtaking vehicle 6 in the wind tunnel coordinate system are obtained. Since the balance coordinate system is relatively fixed relative to the test device itself, the external interference can be effectively reduced in this coordinate system, making the aerodynamic force and torque obtained in the balance coordinate system more accurate, providing a reliable data basis for subsequent analysis; by analyzing the aerodynamic force and torque of the overtaken vehicle 5 and the overtaking vehicle 6 in the wind tunnel coordinate system, the influence of the aerodynamic force at different relative positions on the vehicle stability and maneuverability is obtained, thereby optimizing the vehicle performance.

[0097] Working principle: The positions of the overtaken vehicle 5 and the overtaking vehicle 6 after installation are as follows: Figure 2 As shown, the balance rotating device 2 is first rotated 90° counterclockwise, and the first vehicle rotating device 3 and the second vehicle rotating device 4 are controlled to rotate 90° clockwise, so that the front of the overtaken vehicle 5 and the front of the overtaking vehicle 6 face the wind tunnel 1. At this time, the overtaking vehicle 6 is located directly behind the overtaken vehicle 5 (as shown in FIG. Figure 5When the test starts, when the wind speed of the wind tunnel 1 reaches the set wind speed, the balance rotating device 2 starts to rotate clockwise, and the overtaken vehicle 5 and the overtaking vehicle 6 are rotated counterclockwise by remote control at the same time, so that the front of the overtaken vehicle 5 and the overtaking vehicle 6 always keep facing the wind tunnel nozzle, and the angle of the balance rotating device 2 and the rotation angle of the overtaken vehicle 5 and the overtaking vehicle 6 are consistent. Figure 5-Figure 9 The state changes, the balance rotating device 2 rotates 180°, the overtaken vehicle 5 and the overtaking vehicle 6 rotate 180°, and the overtaking vehicle 6 is located in front of the overtaken vehicle 5 (such as Fig. 9 During the test, the position of the overtaking vehicle 6 relative to the overtaken vehicle 5 changes as shown in Fig.10 As shown, the overtaking vehicle 6 has 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 convert the six-component force in the balance coordinate system into the six-component force in the stable wind tunnel coordinate system through the host computer, and then judge the impact on the vehicle stability through the six-component force in the wind tunnel coordinate system, thereby optimizing the vehicle performance and reducing the impact of aerodynamic force on vehicle stability.

[0098] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or change made by a person skilled in the art based on the present invention is within the protection scope of the present invention.

Claims

1. An automobile wind tunnel overtaking test device, characterized in that: include: A wind tunnel (1), a balance rotating device (2), a first vehicle rotating device (3), a second vehicle rotating device (4), a vehicle to be overtaken (5) and an overtaking vehicle (6), wherein the balance rotating device (2) is installed at the air outlet of the wind tunnel (1); The balance rotating device (2) is configured to be able to rotate clockwise or counterclockwise, and the overtaken vehicle (5) and the overtaking vehicle (6) are both mounted 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 mounted on the balance rotating device (2) via the first vehicle rotating device (3), and the overtaking vehicle (6) is mounted on the balance rotating device (2) via the second vehicle rotating device (4), and the first vehicle rotating device (3) and the second vehicle rotating device (4) can respectively drive the overtaken vehicle (5) and the overtaking vehicle (6) to rotate counterclockwise or clockwise; 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 opposite directions, so that the front of the overtaken vehicle (5) and the front of the overtaking vehicle (6) are kept facing the wind tunnel (1).

2. The automobile wind tunnel overtaking test device according to claim 1, characterized in that: The balance rotating device (2) comprises a first bracket (21), a second bracket (21) and a turntable body (23); the first vehicle rotating device (3) is supported on the turntable body (23) through the first bracket (21); the second vehicle rotating device (4) is supported on the turntable body (23) through the second bracket (21), so that the turntable 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 drive of the first vehicle rotating device (3) and the second vehicle rotating device (4), so that the front of the overtaken vehicle (5) and the front of the overtaking vehicle (6) are always facing the wind tunnel (1) and the relative position exchange is completed.

3. The automobile wind tunnel overtaking test device according to claim 2, characterized in that: The first bracket (21) and the second bracket (21) are both equipped with force sensors, which are used to detect the aerodynamic force and torque exerted on the overtaken vehicle (5) and the overtaking vehicle (6).

4. The automobile wind tunnel overtaking test device according to claim 2, characterized in that: 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 mounted on the first bracket (21) via a first connecting member (24); the driving assembly (31) is connected to the rotating assembly (32) via the transmission assembly (33) to drive the rotating assembly (32) to rotate; and the overtaken vehicle (5) is mounted on the rotating assembly (32).

5. The automobile wind tunnel overtaking test device according to claim 4, characterized in that: The driving assembly (31) includes a driving gear (311), the rotating assembly (32) includes a driven gear (321), the transmission assembly (33) is a gear set, the driving gear (311) is meshed with the transmission assembly (33), and the transmission assembly (33) is meshed with the driven gear (321); the overtaken vehicle (5) is mounted on the driven gear (321).

6. The automobile wind tunnel overtaking test device according to claim 5, characterized in that: The transmission assembly (33) comprises a first reduction gear (331) and a second reduction gear (332), wherein 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).

7. The automobile wind tunnel overtaking test device 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 mounted on the first bracket (21) via a first connecting member (24); the motor is mounted on the support (312); the driving gear (311) is mounted on the motor via the driving shaft (313); and the driven gear (321) is rotatably mounted on the support (312).

8. A method for using an overtaking test device in an automobile wind tunnel, characterized in that: Using the device according to any one of claims 1 to 7, the method comprises the following steps: S01: The overtaken vehicle (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), with the front of the overtaken vehicle (5) and the front of the overtaking vehicle (6) facing the wind tunnel (1), and the overtaken vehicle (5) is located directly in front of the overtaking vehicle (6); S02: starting the wind tunnel (1), and after the wind speed of the wind tunnel (1) reaches a preset value, starting the balance rotating device (2), the first vehicle rotating device (3) and the second vehicle rotating device (4) to rotate until the overtaking vehicle (6) is located directly in front of the overtaken vehicle (5), completing the overtaking test and closing the balance rotating device (2), the first vehicle rotating device (3) and the second vehicle rotating device (4).

9. The method for using the overtaking test device in a wind tunnel for an automobile 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) 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).

10. A force analysis method for an overtaking test device in a wind tunnel for an automobile, characterized in that: Using the device of claim 3, the method comprises the following steps: S10: When the balance rotating device (2) is rotating, the aerodynamic force and torque exerted on the overtaken vehicle (5) and the overtaking vehicle (6) from the airflow of the wind tunnel (1) in the balance coordinate system are respectively obtained through each of the force measuring sensors; S20: according to the rotation angle of the balance rotating device (2) and the aerodynamic force and moment of the airflow of the wind tunnel (1) exerted on the overtaken vehicle (5) and the overtaking vehicle (6) in the balance coordinate system at the rotation 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 forces and moments of the overtaken vehicle (5) and the overtaking vehicle (6) in the wind tunnel coordinate system, and determine the relationship between the aerodynamic characteristics and handling stability of the overtaking vehicle (6) during the overtaking process, so as to optimize vehicle performance.

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