Single vehicle wheel test platform

Abstract

The invention provides a bicycle wheel test platform, the bicycle wheel test platform is used for a wind tunnel test, the bicycle wheel test platform is characterized in that the bicycle wheel test platform comprises a support structure, a force measuring device and a fairing, the support structure is configured to support a bicycle wheel; the force measuring device is connected with the supporting structure and is used for measuring the translational air resistance of the wheel; the fairing wraps the supporting structure in the mode that a first gap exists between the inner surface of the fairing and the outer surface of the supporting structure, and the fairing is configured to be independent of the supporting structure and the force measuring device, so that the influence of the supporting structure on the measured aerodynamic load is eliminated. The single vehicle wheel test platform can measure the translation air resistance of the wheel under the condition of eliminating the influence of a support structure on the measured aerodynamic load.

Description

Technical Field

[0001] The present invention relates to the technical field of bicycle wheel testing, and in particular, to a bicycle wheel testing platform. Background Art

[0002] With the continuous progress of science and technology and processing production technology, the competition in elite sports has become increasingly fierce. Taking the Olympic track cycling race as an example, the time difference between the first and second place in the event is usually measured in milliseconds. Therefore, any improvement in athletes and sports equipment is crucial for improving the racing performance. Conventional physical endurance and strength training help improve the power output of athletes. At the same time, reducing the resistance of athletes and sports equipment is also equally important. Most of this resistance comes from air resistance. Therefore, reducing air resistance is very important for improving the competition performance of athletes. Although optimizing the athlete's posture to reduce air resistance is one method, its benefits also depend on the athlete's physiological performance. An extremely aerodynamic-optimized posture may affect the athlete's power generation method and power output. Therefore, optimizing the design of sports equipment to reduce air resistance can obtain more stable benefits.

[0003] Wind tunnel testing has been applied in many countries to measure the air resistance of sports equipment. In wind tunnel testing, airflows are artificially generated in a controlled manner to simulate the air flow conditions faced by sports equipment in actual competitions. Sports equipment, such as bicycle wheels, is usually connected to a support structure, and the support structure is fixed on a force measuring balance to measure the aerodynamic load. These measurements require high measurement accuracy and precision, and the experimental environment needs to be as close to the real environment as possible to ensure the practicality and reliability of the experimental results. Due to the complex motion state and motion environment of bicycle wheels, it is difficult to measure the resistance. Special bicycle wheel testing platforms are often used in wind tunnel tests related to bicycle wheels. Since it simulates the real motion state and environment of the wheels, the difficulty of wind tunnel testing is reduced, and the practicality and reliability of the experimental results can be significantly improved.

[0004] However, such a bicycle wheel test platform has the following deficiencies. First, the support structure of the test platform is usually made of non-streamlined metal and is relatively close to the wheel, usually about 100 mm, which will greatly disrupt the air flow around the wheel, resulting in a large difference from the real motion environment and affecting the practicality and reliability of the experimental results. Second, the support structure is usually exposed to the air flow. When the force-measuring balance measures the resistance of the wheel, it will also measure the resistance of the support structure. Even if the resistance part of the support structure can be eliminated by measuring the resistance of the support structure separately, this will still affect the accuracy of the wheel resistance measurement and increase the time-consuming of the overall experiment. Third, the air resistance of the bicycle wheel is divided into translational air resistance and rotational air resistance, and the force-measuring balance connected to the support structure can only measure the translational air resistance. Research has found that the rotational air resistance of the bicycle wheel can account for 55% of the total resistance, so measuring the rotational air resistance is also very important for the optimization of the bicycle wheel. Fourth, there are various options for the driving method of the bicycle wheel, including being driven by a rolling floor, directly driven by a motor, driven by rollers, etc. Each method will affect the design and connection method of the support structure and the force-measuring balance, so it needs to be considered integrally. Finally, in the real motion situation, the tire surface of the bicycle wheel will contact the track ground to form a contact surface. How to simulate the flow near the wheel contact surface in the wind tunnel is also related to the driving method of the wheel, the design and connection method of the support structure and the force-measuring balance. In summary, the existing bicycle wheel test platforms currently have great limitations in achieving accurate, reliable, comprehensive, and real wheel resistance evaluation.

[0005] Therefore, there is a need to provide an improved bicycle wheel test platform to overcome or reduce at least some of the disadvantages existing in the above prior art. Summary of the Invention

[0006] In the present invention, a bicycle wheel test platform is provided. The bicycle wheel test platform is used for wind tunnel testing and is characterized in that the bicycle wheel test platform includes: a support structure, a force-measuring device, and a fairing. Among them,

[0007] The support structure is configured to support the wheel of the bicycle;

[0008] The force-measuring device is connected to the support structure and is used to measure the translational air resistance of the wheel;

[0009] The fairing wraps the support structure in such a way that there is a first gap between the inner surface of the fairing and the outer surface of the support structure, and the fairing is configured to be independent of the support structure and the force-measuring device, so as to eliminate the influence of the support structure on the measured aerodynamic load.

[0010] Optionally, the size of the first gap is 2-10 millimeters.

[0011] Optionally, the bicycle wheel test platform further includes a first substrate; wherein, the force measuring device is configured to be independent of the first substrate, and the support structure is mounted on the force measuring device; the fairing is fixedly connected to the first substrate.

[0012] Optionally, the support structure is configured to support the wheel through a transmission shaft, so that the wheel is suspended.

[0013] The bicycle wheel test platform further includes a drive unit, and the drive unit is configured to drive the wheel to rotate through a transmission shaft.

[0014] Optionally, the bicycle wheel test platform further includes a torque sensor, and the torque sensor is mounted on the transmission shaft for measuring the rotational air resistance of the wheel.

[0015] Optionally, the drive unit includes a DC motor and an optoelectronic rotary encoder, and the output shaft of the DC motor is connected to the transmission shaft.

[0016] Optionally, the support structure includes a vertical support rod and a horizontal support rod, the force measuring device is arranged at the lower end of the vertical support rod, and the transmission shaft is supported on the horizontal support rod in a rotatable manner;

[0017] The fairing includes a vertical section and a horizontal section, the vertical section at least wraps the vertical support rod, and the horizontal section at least wraps the horizontal support rod.

[0018] Optionally, the distance between the vertical support rod and the wheel is 200 - 400 mm; and / or

[0019] The distance between the end of the horizontal section close to the wheel and the wheel is not less than 60 mm.

[0020] Optionally,

[0021] The fairing has a streamlined appearance; and / or

[0022] The vertical support rod of the support structure is a hollow structure.

[0023] Optionally, the bicycle wheel test platform further includes a second substrate, the second substrate is used as a simulated ground, and there is a second gap between the upper surface of the second substrate and the wheel.

[0024] Optionally, the cross-sectional shape of the leading edge of the second substrate is semi-elliptical, the ratio of the major axis to the minor axis is n:1, where n is not less than 3, and the thickness of the second substrate is not greater than 20 mm; and / or

[0025] The height of the second gap is not greater than 1 mm.

[0026] The single - bicycle - wheel test platform for wind - tunnel testing of the present invention is configured to include a support structure, a force - measuring device, and a fairing. The support structure is used to support the wheel of the bicycle. The force - measuring device is connected to the support structure. The fairing is configured to wrap the support structure in such a way that there is a first gap between the inner surface of the fairing and the outer surface of the support structure, and the fairing is independent of the support structure and the force - measuring device, so that the translational air resistance of the wheel can be measured while eliminating the influence of the support structure on the measured aerodynamic load.

[0027] Furthermore, the single - bicycle - wheel test platform of the present invention further improves the accuracy of measurement data and helps to simulate the actual working state of the wheel by configuring the support structure to support the wheel in a suspended manner through a transmission shaft and driving the wheel to rotate through the transmission shaft by a driving unit.

[0028] Furthermore, the single - bicycle - wheel test platform of the present invention can measure both the translational air resistance and the rotational air resistance of the wheel by setting a torque sensor, achieving comprehensive measurement of aerodynamic loads.

[0029] Those skilled in the art will become more clearly aware of the above - mentioned and other objects, advantages, and features of the present invention from the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The features, advantages, and exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which the same reference numerals indicate the same elements, and:

[0031] Figure 1 is a schematic diagram of the overall structure of the single - bicycle - wheel test platform according to an embodiment of the present invention.

[0032] Figure 2 is Figure 1 a view of the details of the driving unit, transmission shaft, force - measuring device, torque sensor, etc. of the single - bicycle - wheel test platform shown.

[0033] Figure 3 is Figure 1 a partially enlarged schematic diagram of the fairing and transmission shaft of the single - bicycle - wheel test platform shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] The following describes the exemplary embodiments of the present invention in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely exemplary and in no way limits the present invention and its application or use. Moreover, the dimensions and proportions of the components in the drawings are only schematic and do not strictly correspond to the actual products.

[0035] As Figure 1As shown, the present invention provides a bicycle wheel test platform 100 for wind tunnel testing. The bicycle wheel test platform 100 may include: a support structure 101, a force measuring device 102, and a fairing 107. The support structure 101 is configured to support the wheel 200 of the bicycle. The force measuring device 102 is connected to the support structure 101 and is used to measure the translational air resistance of the wheel 200. The fairing 107 wraps the support structure 101 in such a way that there is a first gap between the inner surface of the fairing 107 and the outer surface of the support structure 101, and the fairing 107 is configured to be independent of the support structure 101 and the force measuring device 102, so as to eliminate the influence of the support structure 101 on the measured aerodynamic load. The bicycle wheel test platform 100 for wind tunnel testing according to the embodiment of the present invention is configured to include a support structure 101, a force measuring device 102, and a fairing 107. The support structure 101 is used to support the wheel 200 of the bicycle. The force measuring device 102 is connected to the support structure 101. The fairing 107 is arranged to wrap the support structure 101 in such a way that there is a first gap between the inner surface of the fairing 107 and the outer surface of the support structure 101, and the fairing 107 is independent of the support structure 101 and the force measuring device 102, so that the translational air resistance of the wheel 200 can be measured while eliminating the influence of the support structure 101 on the measured aerodynamic load. The fairing 107 is independent of the support structure 101 and the force measuring device 102, that is, there is no connection between the fairing 107 and the support structure 101, and between the fairing 107 and the force measuring device 102. By providing an independent fairing 107, it can be ensured that the measurement result of the force measuring device 102 connected to the support structure 101 is basically only the data of the wheel 200, minimizing the interference of the support structure 101 on the aerodynamic load measurement, ensuring the accuracy of the wheel 200 resistance measurement and reducing the time consumption of the overall experiment. The force measuring device 102 according to the embodiment of the present invention may be a force balance and may be selected from a single-dimensional force sensor or a multi-dimensional force sensor.

[0036] The size of the first gap is preferably 2-10 millimeters. For example, the first gap is 2 millimeters, 4 millimeters, 6 millimeters, or 10 millimeters. If the first gap is too large, it will increase the volume of the fairing 107, increase the blockage of the wind tunnel, and affect the quality of the oncoming flow. If the first gap is too small, it will increase the risk of collision between the fairing 107 and the support structure 101. After multiple tests on different materials of the support structure 101 and the fairing 107 and different sizes of the first gap, the above preferred range value of the first gap is obtained. The support structure 101 can be made of a suitable metal or can be a wooden structure. The material of the support structure 101 affects the strength of the support structure 101. Generally, for wind tunnel tests, under extreme working conditions, the deformation of the support structure 101 should be less than 0.5 mm, otherwise it may contaminate the test results and affect the practicality of the conclusion. The material selection of the fairing 107 only needs to meet the requirement that the deformation of the fairing 107 during the test is less than 0.5 mm and it does not contact the support structure 101.

[0037] The first gap between the fairing 107 and the support structure 101 can be a constant value or a non-constant value. Usually, the first gap is a non-constant value. That is, at different parts of the support structure 101, the first gap between the support structure 101 and the fairing 107 can be different. In Figure 1 the illustrated embodiment, the first gap between the vertical section 171 of the fairing 107 and the vertical support rod 111 of the support structure 101 remains substantially constant, while due to the different sizes of the components described below included on the horizontal support rod 112, the first gap between the horizontal section 172 of the fairing 107 and the horizontal support rod 112 of the support structure 101 is slightly different at each location.

[0038] Combined with Figure 1 and Figure 2 , the single-wheel test platform 100 of the embodiment of the present invention may further include a first substrate 106; wherein, the force measuring device 102 is configured to be independent of the first substrate 106, and the support structure 101 is installed on the force measuring device 102; the fairing 107 is fixedly connected to the first substrate 106. By providing the first substrate 106, the force measuring device 102 is independent of the first substrate 106, while the fairing 107 is fixed to the first substrate 106, and the support structure 101, the force measuring device 102, and the fairing 107 can be arranged in a simple and easily configured manner. The first substrate 106 can generally be the wind tunnel floor. In Figure 2In the illustrated embodiment, a hole (not labeled in the figure) is formed in the first substrate 106, and the force measuring device mounting platform 120 on which the force measuring device 102 is mounted is disposed below the first substrate 106. The force measuring device 102 is arranged through the hole in the first substrate 106, wherein the force measuring device mounting platform 120 is independent of the first substrate 106. By forming a hole in the first substrate 106 and arranging the force measuring device 102 at the hole, and fixing the fairing 107 to the first substrate 106, the support structure 101, the force measuring device 102 and the fairing 107 can be arranged in a simple, easily configurable and compact manner. The force measuring device 102 is independent of the first substrate 106, that is, there is no contact between the force measuring device 102 and the first substrate 106. The force measuring device mounting platform 120 is independent of the first substrate 106, that is, there is no connection between the force measuring device mounting platform 120 and the first substrate 106. In combination with Figure 1 , the fairing 107 is fixedly connected to the first substrate 106 above the first substrate 106. The fixing between the fairing 107 and the first substrate 106 can be achieved by using fasteners such as screws, or other fixing methods such as gluing.

[0039] In some embodiments, the support structure 101 is configured to support the wheel 200 through the transmission shaft 103, so that the wheel 200 is suspended; the single-wheel test platform 100 further includes a driving unit 104, and the driving unit 104 is configured to drive the wheel 200 to rotate through the transmission shaft 103. In the single-wheel test platform 100 according to the embodiment of the present invention, by configuring the support structure 101 to support the wheel 200 through the transmission shaft 103, the wheel 200 is suspended, and the driving unit 104 drives the wheel 200 to rotate through the transmission shaft 103, which can further improve the accuracy of the measurement data and help to simulate the actual working state of the wheel 200.

[0040] The driving unit 104 of the single-wheel test platform 100 of the present invention may include a DC motor (not labeled in the figure) and a photoelectric rotary encoder (not labeled in the figure), and the output shaft of the DC motor is connected to the transmission shaft 103. In the single-wheel test platform 100 according to the embodiment of the present invention, by setting the driving unit 104 to have a DC motor and connecting the output shaft of the DC motor to the transmission shaft 103, the wheel 200 can be independently driven. Generally, the DC motor is used in combination with a planetary reducer and is matched with the transmission shaft 103 by using a coupling. By setting the photoelectric rotary encoder, the purpose of accurately controlling the rotation speed and phase angle can be achieved, and the rotation speed range of the wheel 200 can cover the speed ranges of common road bikes and track bikes in racing competitions.

[0041] The bicycle wheel test platform 100 of the present invention may further include a torque sensor 105. The torque sensor 105 is installed on the transmission shaft 103 and is used to measure the rotational air resistance of the wheel 200. By providing the force measuring device 102 and the torque sensor 105, the bicycle wheel test platform 100 according to the embodiments of the present invention can measure the translational air resistance and the rotational air resistance of the wheel 200 simultaneously, achieving comprehensive measurement of aerodynamic loads.

[0042] The driving methods of the wheel 200 mainly include the rolling floor driving method, the roller driving method, and the direct motor driving method. The rolling floor driving method has the following disadvantages: high cost. At the same time, since the wheel 200 will contact the belt of the rolling floor during the test, the measuring device and the support structure 101 need to bear the loads brought by the belt and its driving part, which will contaminate the measured aerodynamic loads, resulting in errors in the aerodynamic loads measured by the measuring device. In the roller driving method, since the wheel 200 will contact the roller during the test, there is also a problem of measurement error. At the same time, because the ground needs to be opened to expose the roller to drive the wheel 200, this layout deviates greatly from the actual ground situation and is not representative. By suspending the wheel 200 and using direct motor drive, the bicycle wheel test platform 100 according to the embodiments of the present invention can avoid the contact of the wheel 200 with other structures during the measurement process, so that the translational air resistance and the rotational air resistance of the single wheel 200 can be measured, improving the accuracy of the data. Moreover, this structural layout also enables the optimization of the contact between the wheel 200 and the simulated ground by minimizing the gap between the wheel 200 and the simulated ground described below, so as to be closer to the actual working state of the wheel 200.

[0043] Since the wheel 200 only needs to be connected to the transmission shaft 103, the test platform 100 according to the embodiments of the present invention can be very conveniently adapted to common road bike wheels and track bike wheels respectively.

[0044] In some embodiments, the support structure 101 includes a vertical support rod 111 and a horizontal support rod 112. The force measuring device 102 is disposed at the lower end of the vertical support rod 111, and the transmission shaft 103 is supported on the horizontal support rod 112 in a rotatable manner; the fairing 107 includes a vertical section 171 and a horizontal section 172. The vertical section 171 at least wraps the vertical support rod 111, and the horizontal section 172 at least wraps the horizontal support rod 112. By arranging the support structure 101 to include a vertical support rod 111 and a horizontal support rod 112, and the transmission shaft 103 is supported on the horizontal support rod 112 in a rotatable manner, the wheel 200 can be stably suspended and supported. The vertical support rod 111 and the horizontal support rod 112 can be integrally formed parts or split assembled parts. Generally, a mounting seat is provided on the horizontal support rod 112, and the transmission shaft 103 is rotatably arranged parallel to the horizontal support rod 112 through the mounting seat. Correspondingly, by arranging the fairing 107 to include a vertical section 171 and a horizontal section 172, the vertical support rod 111 and the horizontal support rod 112 of the support structure 101 can be respectively rectified. Generally, the vertical section 171 wraps the vertical support rod 111 and the force measuring device 102 associated with the vertical support rod 111; the horizontal section 172 wraps the horizontal support rod 112 and the components associated with the horizontal support rod 112, such as the drive unit 104, the torque sensor 105, the transmission shaft 103, etc.

[0045] When ensuring the strength of the support structure 101, the larger the distance between the vertical support rod 111 and the wheel 200, the better. In some embodiments, the distance between the vertical support rod 111 and the wheel 200 can be 200 - 400 millimeters, such as 200 millimeters, 250 millimeters, 300 millimeters, 400 millimeters. The minimum distance of 200 millimeters is the minimum distance that can neglect the influence of the vertical support rod 111 on the flow around the wheel 200 demonstrated by computational fluid dynamics. The theoretical formula of computational fluid dynamics is the Navier - Stokes equation (NS equation), but in engineering applications, considering the complexity and cost - effectiveness, the NS equation is generally not directly solved, but the time - averaged NS equation is solved. For example, in the present invention, the Reynolds - averaged Navier - Stokes equation is used. If the distance between the vertical support rod 111 and the wheel 200 is too small, the vertical support rod 111 will affect the flow around the wheel 200, thereby interfering with the measurement of the aerodynamic load; if the distance between the vertical support rod 111 and the wheel 200 is too large, it will affect the strength of the overall support structure 101, such as resonance phenomenon, posing a threat to the test safety. This distance range is particularly applicable to the wheels of common 700c - diameter road bikes and track bikes, with tire widths ranging from 23mm to 32mm. For other bicycle wheels not within the aforementioned range, the appropriate distance size can be re - confirmed through computational fluid dynamics.

[0046] The larger the distance between the end of the transverse section 172 closer to the wheel 200 and the wheel 200 within a reasonable range, the better, so as to minimize the influence of the fairing 107 and the entire support structure 101 on the flow around the wheel 200. Generally, the distance between the end of the transverse section 172 closer to the wheel 200 and the wheel 200 is not less than 60 mm, such as 60 mm, 80 mm, 100 mm. Figure 3 A partial enlarged schematic view of the transverse section 172 of the fairing 107 and the transmission shaft 103 is shown. The right end surface of the transverse section 172 is open at a position corresponding to the transmission shaft 103 for the transmission shaft 103 to pass through. The distance of 60 mm is the minimum distance obtained by computational fluid dynamics calculation. If the distance between the transverse section 172 and the wheel 200 is too small, the fairing 107 will affect the flow around the wheel 200.

[0047] In some embodiments, the fairing 107 may have a streamlined appearance to reduce the situation where the fairing 107 disturbs the air flow around the wheel 200, which is beneficial to ensuring the practicality and reliability of the experimental results. It can be understood that when the fairing 107 is provided, the fairing 107 is usually set to have a streamlined appearance, while the support structure 101 wrapped by the fairing 107 may not have a streamlined appearance. As Figures 1 to 2 shown, the vertical support rod 111 is a cylindrical rod, and the vertical section 171 is a hollow cylindrical cover; the horizontal support rod 112 and the motor as a whole form a structure with a square longitudinal section, and the transverse section 172 of the fairing 107 is a hollow airfoil cover. For example, the airfoil includes but is not limited to NACA0012 airfoil, NACA0018 airfoil, C30u airfoil, Eppler E863 airfoil. It can be understood that the support structure 101 and the fairing 107 may also have other streamlined appearances with smooth surfaces and continuous lines.

[0048] In a preferred embodiment, the support structure 101 is a hollow structure. By setting the support structure 101 to be internally hollow, the purpose of routing wires inside can be achieved, protecting the safety of the wires and avoiding damage to the cables. As Figure 2 shown, the vertical support rod 111 may be a hollow structure. It can be understood that when the fairing 107 is provided, the support structure 101 may not be set as a hollow structure, but the first gap between the support structure 101 and the fairing 107 is used for routing wires.

[0049] Refer to Figure 1, the bicycle wheel test platform 100 of the present invention may further include a second substrate 108, which serves as an imitation ground. There is a second gap between the upper surface of the second substrate 108 and the wheel 200. The second substrate 108 may be referred to as an imitation floor or an imitation ground. By providing the second substrate 108, the bicycle wheel test platform 100 of the present invention can reduce the boundary layer thickness so as to better simulate the flow near the contact surface between the actual wheel 200 and the ground.

[0050] The material of the second substrate 108 is preferably metal, but it can also be wood and plastic products. The second substrate 108 can be supported by support legs (not shown in the figure). The fixation between the second substrate 108 and the support legs can be through threaded connection or adhesive connection. Generally, the first substrate 106 is also supported by support legs. The fixation between the first substrate 106 and the support legs can be through threaded connection or adhesive connection. The first substrate 106 and the second substrate 108 can be supported by the same support legs or by different support legs. To reduce the number of components, generally the first substrate 106 and the second substrate 108 are supported by the same support legs, and the first substrate 106 is arranged below the second substrate 108.

[0051] The shape of the second substrate 108 can be circular, rectangular, etc. Considering the test conditions at different yaw angles, in order to ensure that the oncoming flow does not change much, a circular second substrate 108 is usually selected.

[0052] As described above, the first substrate 106 is usually the wind tunnel ground, and the second substrate 108 is an additionally added imitation ground. Ideally, the area of the second substrate 108 should completely cover the entire area of the floor of the wind tunnel test section. Considering the practical installation difficulty, the area of the second substrate 108 should be as large as possible to cover a large enough area. When the second substrate 108 is circular, its radius should be greater than or equal to 3 times the radius of the wheel 200.

[0053] The shape of the leading edge of the second substrate 108 and the thickness of the second substrate 108 will affect the boundary layer thickness on the surface of the second substrate 108. The cross-sectional shape of the leading edge 108 of the second substrate is preferably semi-elliptical, and the ratio of the major axis to the minor axis is n:1, where n is not less than 3. For example, n is 4, 5.5, 6. The thickness of the second substrate 108 should be as small as possible on the premise of ensuring the structural strength of the second substrate 108 to reduce the blockage degree of the wind tunnel. Generally, the thickness of the second substrate 108 is not greater than 20 mm. For example, the thickness of the second substrate 108 is 5 mm, 10 mm, 15 mm. After testing, the boundary layer thickness on the surface of the 10-mm-thick second substrate 108 was measured by a hot-wire anemometer and was less than 13 mm at a wind speed of 22 m / s, and the overall structure achieved a more realistic simulation of the ground effect.

[0054] The second gap between the second substrate 108 and the wheel 200 should be as small as possible while ensuring that they do not come into contact, in order to better simulate the flow near the contact surface of the wheel 200. Generally, the height of the second gap is not greater than 1 mm. For example, the height of the second gap is 0.2 mm, 0.4 mm, 0.8 mm, or 1 mm. If the second gap is too large, it will cause the test conditions to deviate from the actual situation (because in reality, the second gap is 0 mm), and the conclusions drawn will lack practical application; if the second gap is too small, it will increase the risk of the wheel 200 colliding with the upper surface of the second substrate 108, affecting the measurement of the aerodynamic load of the wheel 200. After conducting multiple tests on different tires and different heights of the second gap, it is concluded that the height of the second gap is preferably within 1 mm. In addition, the single-wheel test platform 100 of the present invention can adapt to wheels 200 with different diameters and tires by adjusting the installation height of the second substrate 108. However, for wheels 200 with different parameters, the height of the second gap should not be greater than 1 mm.

[0055] The single-wheel test platform 100 for wind tunnel testing of the present invention conducts experimental research on the aerodynamics of a single-wheel by simulating real working conditions and performing comprehensive aerodynamic load measurements. Compared with existing single-wheel test platforms, the single-wheel test platform 100 of the present invention can better restore the true motion state of the wheel 200 in wind tunnel testing, reduce the interference of the support structure 101 on the air flow condition near the wheel 200, and the force measuring device 102 and torque sensor 105 measure the translational and rotational air resistance of the wheel 200, providing more reliable, comprehensive, and accurate measurement data.

[0056] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "one example", "some examples", or "preferred embodiment" etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0057] The embodiments of the present invention have been described in detail above. However, the aspects of the present invention are not limited to the above embodiments. Without departing from the scope of the present invention, various modifications and substitutions can be applied to the above embodiments.

Claims

1. A bicycle wheel test platform, which is used for wind tunnel testing, is characterized in that, The bicycle wheel test platform includes: a support structure, a force measuring device, and a fairing. Among them, the support structure is configured to support the wheel of the bicycle; the force measuring device is connected to the support structure and is used to measure the translational air resistance of the wheel; the fairing wraps the support structure in such a form that there is a first gap between the inner surface of the fairing and the outer surface of the support structure, and the fairing is configured to be independent of the support structure and the force measuring device, so as to eliminate the influence of the support structure on the measured aerodynamic load.

2. The bicycle wheel test platform according to claim 1, wherein the size of the first gap is 2 - 10 millimeters.

3. The bicycle wheel test platform according to claim 1 or 2, wherein the bicycle wheel test platform further includes a first substrate; among them, the force measuring device is configured to be independent of the first substrate, the support structure is mounted on the force measuring device; the fairing is fixedly connected to the first substrate.

4. The bicycle wheel test platform according to claim 1 or 2, wherein the support structure is configured to support the wheel through a transmission shaft, so that the wheel is suspended; the bicycle wheel test platform further includes a driving unit, and the driving unit is configured to drive the wheel to rotate through the transmission shaft.

5. The bicycle wheel test platform according to claim 4, wherein the bicycle wheel test platform further includes a torque sensor, and the torque sensor is mounted on the transmission shaft and is used to measure the rotational air resistance of the wheel; the driving unit includes a DC motor and an optoelectronic rotary encoder, and the output shaft of the DC motor is connected to the transmission shaft.

6. The bicycle wheel test platform according to claim 4, wherein the support structure includes a vertical support rod and a horizontal support rod, the force measuring device is arranged at the lower end of the vertical support rod, and the transmission shaft is rotatably supported on the horizontal support rod; the fairing includes a vertical section and a horizontal section, the vertical section at least wraps the vertical support rod, and the horizontal section at least wraps the horizontal support rod.

7. The bicycle wheel test platform according to claim 6, wherein the distance between the vertical support rod and the wheel is 200 - 400 millimeters; and / or the distance between the end of the horizontal section close to the wheel and the wheel is not less than 60 millimeters.

8. The bicycle wheel test platform according to claim 1 or 2, wherein the fairing has a streamlined appearance; and / or the vertical support rod of the support structure is a hollow structure.

9. The bicycle wheel test platform according to claim 1 or 2, wherein the bicycle wheel test platform further includes a second substrate, the second substrate is used as a simulated ground, and there is a second gap between the upper surface of the second substrate and the wheel.

10. The bicycle wheel test platform according to claim 9, wherein The cross-sectional shape of the leading edge of the second substrate is semi-elliptical, with the ratio of the major axis to the minor axis being n:1, where n is not less than 3, and the thickness of the second substrate is not greater than 20 millimeters; and / or The height of the second gap is not greater than 1 millimeter.

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