Medium and heavy commercial vehicle wind tunnel test platform and test method thereof

Abstract

The invention discloses a medium and heavy commercial vehicle wind tunnel test platform and a test method thereof, the test platform comprises a test table top, a test bench and a bottom wind shielding member, the test table top and the bottom wind shielding member are installed on the test bench, and an accommodating space is formed between the test table top and the bottom wind shielding member; the guide rail is installed on the test bed and located in the containing space, and the force measuring device is movably installed on the guide rail and configured to be capable of moving on the guide rail to adapt to vehicle models of different specifications; the flow guide device is arranged on one side, close to the test bench, of the test table board, one side edge of the flow guide device is connected with one side edge of the test table board, and the other opposite side edge of the flow guide device is connected with the bottom wind shielding piece. The force measuring device is positioned in the accommodating space, so that the force measuring device is prevented from being exposed in a wind tunnel flow field, and the force measuring precision of the force measuring device is ensured; the force measuring device is movably mounted on the guide rail, so that the universality of the test platform is improved; the flow guiding device optimizes airflow distribution and ensures the accuracy of wind tunnel testing.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle wind tunnel testing, and in particular to a wind tunnel testing platform for medium and heavy-duty commercial vehicles and a testing method thereof. Background Art

[0002] Wind resistance is the main target of automotive aerodynamic research, and is equally important to commercial vehicles and passenger cars. However, due to issues such as weight and size, the research methods and accumulation of medium and heavy commercial vehicles are far less abundant than those of passenger cars. Domestic automotive wind tunnels are suitable for the research and development needs of passenger cars, and can be used for test measurements of commercial vehicles. They lack the ability to simulate actual road driving conditions. Usually, medium and heavy commercial vehicle models are scaled down and fixed to the force measurement system using brackets and fixtures. The presence of the bracket will change the airflow distribution around the model, introduce additional eddies or turbulence, and thus affect the measurement results of the vehicle's aerodynamic force; at the same time, the bracket itself will also generate aerodynamic resistance, which will be captured by the force measurement system, thus affecting the accuracy of the vehicle's own aerodynamic resistance assessment.

[0003] In view of the quality and cost challenges faced by medium and heavy-duty commercial vehicles in the process of aerodynamic research, as well as the problems of iterative testing efficiency, a wind tunnel testing platform suitable for scaled models of commercial vehicles is needed. This platform can be used for aerodynamic force measurement, body surface pressure measurement and spatial flow field testing of commercial vehicle models of different scales, overcome the limitations of traditional wind tunnel tests in the field of commercial vehicles, and provide more accurate and comprehensive aerodynamic performance data support for the design optimization of commercial vehicles. Summary of the invention

[0004] One of the purposes of the present invention is to provide a wind tunnel test platform for medium and heavy-duty commercial vehicles and a test method thereof, so as to solve the problem in the prior art of lacking a test platform for medium and heavy-duty commercial vehicles in the process of aerodynamic research.

[0005] In order to achieve the above object, the technical solution provided by the present invention is as follows:

[0006] A wind tunnel test platform for medium and heavy-duty commercial vehicles, used for supporting vehicle models, comprising: a test bench, a test bench and a bottom wind shield, wherein the test bench and the bottom wind shield are both mounted on the test bench, and a containing space is formed between the test bench and the bottom wind shield; a force measuring device and a guide rail, wherein the guide rail is mounted on the test bench and is located in the containing space, wherein the force measuring device is movably mounted on the guide rail and is configured to be movable on the guide rail to adapt to vehicle models of different specifications; a flow guide device, wherein the flow guide device is arranged on a side of the test bench close to the test bench, wherein one side of the flow guide device is connected to one side of the test bench, and the other opposite side is connected to the bottom wind shield.

[0007] According to the above technical means, an accommodating space is formed between the test bench surface and the bottom wind shield, and the force measuring device is located in the accommodating space, so that the force measuring device will not be exposed to the wind tunnel flow field, thereby preventing the wind tunnel flow field from affecting the force measuring accuracy of the force measuring device; and the force measuring device is movably installed on the guide rail, so that the position of the force measuring device on the guide rail can be adjusted according to the specifications of the vehicle model, thereby improving the versatility of the test platform; the flow guide device can guide the direction of the airflow, optimize the airflow distribution, and ensure the accuracy of the wind tunnel test.

[0008] Furthermore, the test bench includes a bench cross bar and a bench vertical bar, and the bench cross bar is installed on the bench vertical bar; the bottom wind shield member includes a wind shield bottom plate and a first wind shield side plate, and the wind shield bottom plate is installed on the bench cross bar, and the first wind shield side plate is installed on the bench vertical bar, and one side edge of the first wind shield side plate is connected to one side edge of the wind shield bottom plate.

[0009] According to the above technical means, the test bench cross bar and the test bench vertical bar cooperate with each other to ensure the structural stability of the test bench. The windshield bottom plate and the first windshield side plate are installed on the test bench to block the airflow from entering the accommodating space and avoid interference with the force measuring device.

[0010] Furthermore, the guide device includes a first guide plate and a second guide plate, the second guide plate is installed on the first guide plate; one side of the first guide plate is connected to one side of the test bench, and the other side opposite to the first guide plate is connected to the wind shield bottom plate; the second guide plate is connected to the first wind shield side plate on one side adjacent to the first guide plate.

[0011] According to the above technical means, the first guide plate and the second guide plate cooperate with each other to effectively guide the airflow direction and reduce the fluctuation of the wind tunnel flow field.

[0012] Furthermore, a third guide plate is formed on the second guide plate, and the third guide plate forms a guide angle θ with the test bench surface.

[0013] Furthermore, the diversion angle θ is 5° to 25°.

[0014] According to the above technical means, when the guide angle θ is 5° to 25°, it is beneficial to reduce the vortex and turbulence generated when the airflow passes through the guide device, so that the airflow flows smoothly to the test section, thereby improving the accuracy and reliability of the wind tunnel test.

[0015] Furthermore, it also includes a second windshield side plate, which is installed on the stand vertical rod and is located on two sides of the stand vertical rod opposite to the first windshield side plate.

[0016] According to the above technical means, the stand vertical rod is located between the first windshield side plate and the second windshield side plate, so as to avoid the stand vertical rod being exposed to the wind tunnel flow field and ensure the accuracy of the wind tunnel test.

[0017] Furthermore, the force measuring device includes a first force measuring assembly and a second force measuring assembly, both of which are movably mounted on the guide rail, the first force measuring assembly is used for single vehicle model force measurement, and the second force measuring assembly is used for platoon vehicle model force measurement.

[0018] According to the above technical means, the first force measuring assembly and the second force measuring assembly respectively perform single vehicle model force measurement and platoon vehicle model force measurement, which can meet different types of test requirements and have universality.

[0019] Furthermore, the first force measuring assembly includes a first fixing member, a first force sensor and a first support rod, one end of the first support rod is fixed to the first force sensor, and the other end is used to connect to the vehicle model; the first force sensor is fixed to the first fixing member, and the first fixing member is installed on the guide rail.

[0020] According to the above-mentioned technical means, the first fixing member provides stable support for the first force sensor and the first support rod, ensuring that the first force sensor does not shift during the test, and the first support rod connects the first force sensor and the vehicle model, and can accurately transmit the force and torque of the vehicle model to the first force sensor, thereby ensuring the accuracy of the test.

[0021] Furthermore, the second force measuring assembly includes a second fixing member, a second force sensor and a second support rod, one end of the second support rod is fixed to the second force sensor, and the other end is used to connect the vehicle model; the second force sensor is fixed to the second fixing member, and the second fixing member is installed on the guide rail.

[0022] According to the above technical means, the second fixing member provides stable support for the second force sensor and the second support rod, ensuring that the second force sensor does not shift during the test, and the second support rod can accurately transmit the force and torque of the vehicle model to the second force sensor, thereby ensuring the accuracy of the test.

[0023] The present invention also provides a wind tunnel test method for medium and heavy-duty commercial vehicles, using a wind tunnel test platform for medium and heavy-duty commercial vehicles as described in any one of the above, the test method comprising the following steps:

[0024] The test platform is fixed on the wind tunnel test section, and after the state of the single vehicle model or the platoon vehicle model on the test platform and the test environment parameters are set according to the test requirements, the wind tunnel system is started to perform the wind tunnel test, and the force measuring device collects the triaxial force data of the single vehicle model or the platoon vehicle model in the test environment.

[0025] According to the above technical means, the test platform is fixed on the wind tunnel test section, and the vehicle model of the medium and heavy-duty commercial vehicle is placed on the test platform for wind tunnel testing, which fills the gap of no special equipment when measuring the force of the vehicle model of the medium and heavy-duty commercial vehicle in the wind tunnel environment. It can better reproduce the bottom space flow field of the medium and heavy-duty commercial vehicle, simulate the actual ground effect, and provide more accurate and comprehensive aerodynamic performance data support for the design optimization of the medium and heavy-duty commercial vehicle.

[0026] The beneficial effects of the present invention are:

[0027] 1. In the present invention, an accommodating space is formed between the test bench and the bottom wind shield, and the force measuring device is located in the accommodating space, so that the force measuring device will not be exposed to the wind tunnel flow field, thereby preventing the wind tunnel flow field from affecting the force measuring accuracy of the force measuring device; and the force measuring device is movably installed on the guide rail, so that the position of the force measuring device on the guide rail can be adjusted according to the specifications of the vehicle model, thereby improving the versatility of the test platform; the guide device can guide the airflow direction, optimize the airflow distribution, and ensure the accuracy of the wind tunnel test.

[0028] 2. The testing method of the present invention uses the testing platform of the present invention, fixes the testing platform in the wind tunnel test section, and places the vehicle model of the medium and heavy-duty commercial vehicle on the testing platform for wind tunnel testing, thereby filling the gap of the lack of special equipment when measuring the force of the vehicle model of the medium and heavy-duty commercial vehicle in the wind tunnel environment, and can better reproduce the flow field in the bottom space of the medium and heavy-duty commercial vehicle, simulate the actual ground effect, and provide more accurate and comprehensive aerodynamic performance data support for the design optimization of the medium and heavy-duty commercial vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 is a schematic diagram of the top view structure of the test platform in this embodiment;

[0031] Figure 2 Schematic diagram of the structure of the test bench in this embodiment;

[0032] Figure 3 is a partial structural schematic diagram of the flow guide device in this embodiment installed on the test bench;

[0033] Figure 4 It is a partial structural schematic diagram of the test platform in this embodiment;

[0034] Figure 5 yes Figure 4 A magnified view of the structure at center;

[0035] Figure 6 is a schematic diagram of a single vehicle model coordinate system and a first force measuring assembly coordinate system when performing a single vehicle model wind tunnel test in this embodiment;

[0036] Figure 7 Schematic diagram of the vehicle coordinate system and the second force measuring assembly coordinate system of each single vehicle model when performing a platoon vehicle model wind tunnel test in this embodiment.

[0037] in,

[0038] 100, test bench surface; 200, test bench; 210, bench crossbar; 220, bench vertical bar; 300, bottom wind shield; 310, wind shield bottom plate; 320, first wind shield side plate; 410, first force measuring assembly; 411, first fixing member; 412, first force sensor; 413, first support rod; 420, second force measuring assembly; 421, second fixing member; 422, second force sensor; 423, second support rod; 500, guide rail; 600, guide device; 610, first guide plate; 620, second guide plate; 630, third guide plate; 700, second wind shield side plate. DETAILED DESCRIPTION

[0039] The following will refer to the accompanying drawings and preferred embodiments to illustrate the implementation of the present invention. The accompanying drawings are only used for exemplary description and cannot be understood as limiting the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The various details in this specification can be modified or changed 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. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, so the drawings only show the components related to the present invention rather than the number, shape and size of the components in the actual implementation.

[0040] This embodiment provides Figures 1 to 5A wind tunnel test platform for medium and heavy-duty commercial vehicles is shown, which is used to support vehicle models, and includes: a test bench 100, a test bench frame 200 and a bottom wind shield 300, wherein the test bench 100 and the bottom wind shield 300 are both mounted on the test bench frame 200, and a accommodating space is formed between the test bench 100 and the bottom wind shield 300; a force measuring device and a guide rail 500, wherein the guide rail 500 is mounted on the test bench frame 200 and is located in the accommodating space, and the force measuring device is movably mounted on the guide rail 500 and is configured to be able to move on the guide rail 500 to adapt to vehicle models of different specifications; a guide device 600, wherein the guide device 600 is arranged on a side of the test bench 100 close to the test bench frame 200, and one side of the guide device 600 is connected to one side of the test bench 100, and the other opposite side is connected to the bottom wind shield 300.

[0041] An accommodating space is formed between the test bench surface 100 and the bottom wind shield 300, and the force measuring device is located in the accommodating space, so that the force measuring device will not be exposed to the wind tunnel flow field, thereby preventing the wind tunnel flow field from affecting the force measuring accuracy of the force measuring device; and the force measuring device is movably installed on the guide rail 500, so that the position of the force measuring device on the guide rail 500 can be adjusted according to the specifications of the vehicle model, thereby improving the versatility of the test platform; the guide device 600 can guide the direction of the airflow, optimize the airflow distribution, and ensure the accuracy of the wind tunnel test.

[0042] Preferably, the length, width and height of the test platform are 8m, 1.5m and 0.56m respectively. The test bench 200 is used to support the test bench surface 100 and install the force measuring device, and has excellent strength and rigidity. In addition, the force measuring device is installed in the accommodating space, eliminating the influence of the force measuring device exposed in the flow field on the airflow under the vehicle.

[0043] Preferably, seven guide rails 500 are installed on the test bench 200, so that the force measuring device can adjust its position on the guide rails 500 according to the wheelbase or track of the vehicle model, so as to enhance the versatility of the test platform and realize wind tunnel testing of vehicle models of different specifications.

[0044] like Figure 4 As shown, in this embodiment, the test bench 200 includes a bench cross bar 210 and a bench vertical bar 220, and the bench cross bar 210 is installed on the bench vertical bar 220; the bottom wind shielding member 300 includes a wind shielding bottom plate 310 and a first wind shielding side plate 320, and the wind shielding bottom plate 310 is installed on the bench cross bar 210, and the first wind shielding side plate 320 is installed on the bench vertical bar 220, and one side of the first wind shielding side plate 320 is connected to one side of the wind shielding bottom plate 310. The bench cross bar 210 and the bench vertical bar 220 cooperate to ensure the structural stability of the test bench 200, and the wind shielding bottom plate 310 and the first wind shielding side plate 320 are installed on the test bench 200 to block the airflow from entering the accommodating space and prevent the force measuring device from being disturbed.

[0045] Preferably, both the platform vertical rods 220 and the platform horizontal rods 210 are hollow steel structures, which not only have strong strength and rigidity, but also save materials and conform to the trend of lightweight structure.

[0046] like Figure 3 As shown, in this embodiment, the guide device 600 includes a first guide plate 610 and a second guide plate 620, and the second guide plate 620 is installed on the first guide plate 610; one side of the first guide plate 610 is connected to one side of the test bench 100, and the other side opposite to the first guide plate 610 is connected to the wind shielding bottom plate 310; the side of the second guide plate 620 adjacent to the first guide plate 610 is connected to the first wind shielding side plate 320. Through the mutual cooperation of the first guide plate 610 and the second guide plate 620, the airflow direction can be effectively guided and the fluctuation of the wind tunnel flow field can be reduced.

[0047] like Figure 3 As shown, in this embodiment, a third guide plate 630 is formed on the second guide plate 620, and the third guide plate 630 forms a guide angle θ with the test platform 100. The third guide plate 630 cooperates with the test platform 100 to form a wedge-shaped wedge, which can effectively guide the airflow direction.

[0048] In this embodiment, the diversion angle θ is 5° to 25°. When the diversion angle θ is 5° to 25°, it is beneficial to reduce the vortex and turbulence generated when the airflow passes through the diversion device 600, so that the airflow flows smoothly to the test section, thereby improving the accuracy and reliability of the wind tunnel test.

[0049] like Figure 4 As shown, in this embodiment, a second windshield side plate 700 is further included, which is mounted on the stand vertical bar 220 and is located on two sides opposite to the first windshield side plate 320. The stand vertical bar 220 is located between the first windshield side plate 320 and the second windshield side plate 700 to prevent the stand vertical bar 220 from being exposed to the wind tunnel flow field, thereby ensuring the accuracy of the wind tunnel test.

[0050] like Figure 1 and Figure 2 As shown, in this embodiment, the force measuring device includes a first force measuring assembly 410 and a second force measuring assembly 420. The first force measuring assembly 410 and the second force measuring assembly 420 are both movably mounted on the guide rail 500. The first force measuring assembly 410 is used for single vehicle model force measurement, and the second force measuring assembly 420 is used for platoon vehicle model force measurement. The first force measuring assembly 410 and the second force measuring assembly 420 respectively perform single vehicle model force measurement and platoon vehicle model force measurement, which can meet different types of test requirements and have universality.

[0051] like Figure 5As shown, in this embodiment, the first force measuring assembly 410 includes a first fixing member 411, a first force sensor 412 and a first support rod 413. One end of the first support rod 413 is fixed to the first force sensor 412, and the other end is used to connect to the vehicle model; the first force sensor 412 is fixed to the first fixing member 411, and the first fixing member 411 is installed on the guide rail 500. The first fixing member 411 provides a stable support for the first force sensor 412 and the first support rod 413, ensuring that the first force sensor 412 does not deviate during the test, and the first support rod 413 connects the first force sensor 412 and the vehicle model, and can accurately transmit the force and torque of the vehicle model to the first force sensor 412, thereby ensuring the accuracy of the test.

[0052] like Figure 5 As shown, in this embodiment, the second force measuring assembly 420 includes a second fixing member 421, a second force sensor 422 and a second support rod 423, one end of the second support rod 423 is fixed to the second force sensor 422, and the other end is used to connect the vehicle model; the second force sensor 422 is fixed to the second fixing member 421, and the second fixing member 421 is installed on the guide rail 500. The second fixing member 421 provides a stable support for the second force sensor 422 and the second support rod 423, ensuring that the second force sensor 422 does not deviate during the test, and the second support rod 423 can accurately transmit the force and torque of the vehicle model to the second force sensor 422, thereby ensuring the accuracy of the test.

[0053] Preferably, a positioning opening for the first support rod 413 and the second support rod 423 to extend out is formed on the test bench 100 , so that the first support rod 413 and the second support rod 423 can be connected to the wheels of the vehicle model.

[0054] The present embodiment further provides a wind tunnel test method for medium and heavy-duty commercial vehicles, using any one of the medium and heavy-duty commercial vehicle wind tunnel test platforms mentioned above, the test method comprising the following steps: fixing the test platform in a wind tunnel test section, setting the state of a single vehicle model or a platoon vehicle model on the test platform and test environment parameters according to test requirements, starting the wind tunnel system to perform a wind tunnel test, and using a force measuring device to collect triaxial force data of the single vehicle model or the platoon vehicle model in the test environment.

[0055] The specific test steps include:

[0056] S1, fixing the wind tunnel test platform on the wind tunnel test section, and adjusting the position of the force measuring device on the guide rail 500 according to the vehicle model to adapt to the force measuring position of the vehicle model;

[0057] S2. placing the vehicle model on the test bench 100 according to the test requirements, connecting the force measuring device and performing zero point calibration on the force measuring device to eliminate the initial error;

[0058] S3, start the wind tunnel system, set the parameters of the test environment according to the test requirements, and at the same time, the force measuring device collects the three-axis force data of the vehicle model in the test environment;

[0059] S4. Calculate the aerodynamic six-component force coefficients of the vehicle model in the test environment based on the three-axis force data.

[0060] The six aerodynamic force coefficients include the aerodynamic drag coefficient, the aerodynamic lateral force coefficient, the aerodynamic lift coefficient, the aerodynamic yaw moment coefficient, the aerodynamic roll moment coefficient and the aerodynamic pitch moment coefficient.

[0061] The test platform is fixed in the wind tunnel test section, and the vehicle model of the medium and heavy-duty commercial vehicle is placed on the test platform for wind tunnel testing. This fills the gap of the lack of special equipment when measuring the force of the vehicle model of the medium and heavy-duty commercial vehicle in the wind tunnel environment. It can better reproduce the flow field in the bottom space of the medium and heavy-duty commercial vehicle and simulate the actual ground effect, providing more accurate and comprehensive aerodynamic performance data support for the design optimization of the medium and heavy-duty commercial vehicle.

[0062] Preferably, when the test platform in this embodiment is used to perform a wind tunnel test on a single vehicle model, four identical first force measuring assemblies 410 are provided, and the four first force measuring assemblies 410 perform synchronous force measurement on the single vehicle model. At this time, the test coordinate system XYZ is the vehicle coordinate system, and the coordinate origin O is located at the projection center of the bottom of the single vehicle model on the test bench 100; when calculating the aerodynamic six-component force coefficient, the coordinate system XYZ is the vehicle coordinate system. i Y i Z i (i=1, 2, 3, 4) is the local coordinate system of the i-th first force measuring assembly 410, and the origin of the coordinate system is located at the projection center of the first force measuring assembly 410 on the test bench 100. It is worth noting that the X-axis and Y-axis of the vehicle coordinate system and the X-axis of the local coordinate system of the first force measuring assembly 410 are i Axis and Y i The axes are located in the plane where the test bench 100 is located, the Z axis of the vehicle coordinate system, the Z axis of the local coordinate system of the first force measuring assembly 410 i The axes are perpendicular to the plane where the test table 100 is located and follow the right-hand screw rule.

[0063] When the wind angle of attack is zero, the coordinate system of the single vehicle model and the coordinate system of the first force measuring assembly 410 are arranged in plane as follows: Figure 6 As shown; the wind speed direction is consistent with the coordinate axis X direction and the positive direction of the Z axis is guaranteed to be upward. The wind attack angle is defined as the angle between the average wind speed U direction and the YOZ plane of the single vehicle model, and the wind attack angle is positive when the vertical axial force is positive. According to the definition of the above coordinate system, the relationship between each force component of each first force measuring assembly 410 and each force component of the single vehicle model can be obtained, which can be specifically calculated by the following formula:

[0064]

[0065] In the formula,

[0066] F b (b = x, y, z) is the aerodynamic force acting on the single vehicle model in the direction of the X axis, Y axis or Z axis;

[0067] M b (b = x, y, z) is the aerodynamic moment of the single vehicle model around the X-axis, Y-axis or Z-axis;

[0068] f b (i) (b = x, y, z; i = 1 to 4) is the force acting on the first force measuring assembly 410X i Axis or Y i Axis or Z i Aerodynamic force in the axial direction;

[0069] m b (b=x, y, z) is the first force measuring component 410X i Axis or Y i Axis or Z i The aerodynamic moment of the axis around the X-axis, Y-axis or Z-axis respectively;

[0070] x(i) and y(i) (i=1-4) are respectively the coordinate values ​​of the center of the first force measuring assembly 410 in the vehicle coordinate system.

[0071] Preferably, when the test platform in this embodiment is used to perform a wind tunnel test on a platoon vehicle model, each single vehicle model in the platoon is equipped with two second force measuring assemblies 420, and the second support rods 423 of the two second force measuring assemblies 420 are respectively connected to the front end and the rear end of the single vehicle model. At this time, the vehicle coordinate system of each single vehicle model and the coordinate system of the second force measuring assembly 420 are as follows: Figure 7 As shown, at this time, the origin of the coordinate system in the vehicle coordinate system is located at the midpoint of the line connecting the two second force measuring components 420; the coordinate system X′ i Y′ i Z′ i (i=1, 2) is the local coordinate system of the i-th second force measuring assembly 420, and the origin of the coordinate system is located at the projection center of the second force measuring assembly 420 on the test bench 100. The X′ axis and Y′ axis of the vehicle coordinate system of each single vehicle model, and the X′ axis of the local coordinate system of the second force measuring assembly 420 i Axis and Y′ i The axes are all located in the plane where the test bench 100 is located, the Z′ axis of the vehicle coordinate system of each single vehicle model, the Z′ axis of the local coordinate system of the second force measuring assembly 420 i The axes are perpendicular to the plane where the test table 100 is located and follow the right-hand screw rule.

[0072] The six aerodynamic forces of each single vehicle model in the platoon vehicle model wind tunnel test are calculated using the following formula:

[0073]

[0074] In the formula,

[0075] F′ b (b=x, y, z) is the aerodynamic force acting on each single vehicle model in the XYZ axis direction;

[0076] M′ b (b=x, y, z) is the aerodynamic moment of the model around the XYZ axis of each single vehicle model coordinate system;

[0077] f′ b (i) (b = x, y, z; i = 1-2) is the force acting on each second force measuring component 420X′ i Axis or Y′ i Axis or Z′ i Aerodynamic force in the axial direction;

[0078] m′ b (b=x, y, z) is each second force measuring component 420X′ i Axis, Y′ i Axis, Z′ i The aerodynamic moments around the X', Y' and Z' axes respectively;

[0079] x′(i) and y′(i) (i=1-2) are respectively the coordinate values ​​of the center of the second force measuring assembly 420 in the vehicle coordinate system of each single vehicle model.

[0080] Obviously, the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A medium and heavy commercial vehicle wind tunnel test platform, used to support vehicle models, characterized in that: include: A test bench (100), a test bench frame (200) and a bottom wind shield (300), wherein the test bench (100) and the bottom wind shield (300) are both mounted on the test bench frame (200), and an accommodation space is formed between the test bench (100) and the bottom wind shield (300); A force measuring device and a guide rail (500), wherein the guide rail (500) is mounted on the test bench (200) and is located in the accommodating space, and the force measuring device is movably mounted on the guide rail (500) and is configured to be movable on the guide rail (500) to adapt to vehicle models of different specifications; A flow guide device (600) is arranged on a side of the test bench (100) close to the test bench frame (200), one side of the flow guide device (600) is connected to a side of the test bench (100), and the other side opposite thereto is connected to the bottom wind shield (300).

2. A medium and heavy commercial vehicle wind tunnel test platform according to claim 1, characterized in that: The test bench (200) comprises a bench cross bar (210) and a bench vertical bar (220), wherein the bench cross bar (210) is mounted on the bench vertical bar (220); the bottom wind shielding member (300) comprises a wind shielding bottom plate (310) and a first wind shielding side plate (320), wherein the wind shielding bottom plate (310) is mounted on the bench cross bar (210), and the first wind shielding side plate (320) is mounted on the bench vertical bar (220), and one side edge of the first wind shielding side plate (320) is connected to one side edge of the wind shielding bottom plate (310).

3. A medium and heavy commercial vehicle wind tunnel test platform according to claim 2, characterized in that: The deflector device (600) comprises a first deflector plate (610) and a second deflector plate (620), wherein the second deflector plate (620) is mounted on the first deflector plate (610); one side of the first deflector plate (610) is connected to one side of the test bench (100), and the other side opposite to the first deflector plate (610) is connected to the windshield bottom plate (310); and one side of the second deflector plate (620) adjacent to the first deflector plate (610) is connected to the first windshield side plate (320).

4. A medium and heavy commercial vehicle wind tunnel test platform according to claim 3, characterized in that: A third flow guide plate (630) is formed on the second flow guide plate (620), and the third flow guide plate (630) forms a flow guide inclination angle θ with the test bench surface (100).

5. A medium and heavy commercial vehicle wind tunnel test platform according to claim 4, characterized in that: The diversion angle θ is 5° to 25°.

6. A medium and heavy commercial vehicle wind tunnel test platform according to claim 2, characterized in that: It also includes a second windshield side plate (700), which is mounted on the platform vertical rod (220) and is located on two opposite sides of the platform vertical rod (220) as the first windshield side plate (320).

7. A medium and heavy commercial vehicle wind tunnel test platform according to claim 1, characterized in that: The force measuring device comprises a first force measuring assembly (410) and a second force measuring assembly (420); the first force measuring assembly (410) and the second force measuring assembly (420) are both movably mounted on the guide rail (500); the first force measuring assembly (410) is used for force measurement of a single vehicle model, and the second force measuring assembly (420) is used for force measurement of a platoon vehicle model.

8. A medium and heavy commercial vehicle wind tunnel test platform according to claim 7, characterized in that: The first force measuring component (410) comprises a first fixing member (411), a first force sensor (412) and a first support rod (413); one end of the first support rod (413) is fixed to the first force sensor (412), and the other end is used to connect to the vehicle model; the first force sensor (412) is fixed to the first fixing member (411), and the first fixing member (411) is installed on the guide rail (500).

9. A medium and heavy commercial vehicle wind tunnel test platform according to claim 7, characterized in that: The second force measuring assembly (420) comprises a second fixing member (421), a second force sensor (422) and a second support rod (423); one end of the second support rod (423) is fixed to the second force sensor (422), and the other end is used for connecting to the vehicle model; the second force sensor (422) is fixed to the second fixing member (421), and the second fixing member (421) is installed on the guide rail (500).

10. A wind tunnel test method for medium and heavy commercial vehicles, characterized in that: A wind tunnel test platform for medium and heavy-duty commercial vehicles according to any one of claims 1 to 9 is used, and the test method comprises the following steps: fixing the test platform in a wind tunnel test section, setting the state of a single vehicle model or a platoon vehicle model on the test platform and test environment parameters according to test requirements, starting the wind tunnel system to perform a wind tunnel test, and the force measuring device collects triaxial force data of the single vehicle model or the platoon vehicle model in the test environment.

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