A test device for a wind-induced vortex-induced vibration generator magnetic restoring couple moment

Abstract

The application discloses a kind of wind-induced vortex-induced vibration generator magnetic restoring couple moment testing device, including swing angle drive and limiting system, measurement system, magnetic restoring couple moment generation and transmission system.Swing angle drive and limiting system include swing angle limiting disc, swing angle drive disc, swing angle positioning pin.Swing angle drive disc is rotated under the drive of driving handle, around swing angle limiting disc rotating shaft, and drive torque instrument, swing shaft and swing permanent magnet to rotate around swing angle limiting disc rotating shaft with the same angular velocity.Swing permanent magnet generates magnetic restoring couple moment under the action of other two fixed permanent magnets, and the size of magnetic restoring couple moment is measured by swing shaft transmission to torque instrument, while laser ranging sensor measures the swing distance of swing shaft, and the change relationship between magnetic restoring couple moment and swing angle can be obtained after converting into swing angle.The application has simple structure, stable and reliable work, and has very important engineering application value.

Description

Technical Field

[0001] This invention relates to a testing device for the magnetic restoring torque of a wind-induced vortex-induced vibration generator. Background Technology

[0002] Wind energy, with its natural advantages such as being pollution-free and renewable, occupies an extremely important position in the development of clean and sustainable energy. Currently, wind power generation mainly relies on rotary blade wind turbines, but their high installation and maintenance costs, high noise levels, and centralized wind farm layout severely restrict their development. On the other hand, wind-induced vortex-induced vibration generators, based on the Karman vortex street phenomenon, utilize the vortex shedding caused by the wind bypassing a solid body, which in turn causes the wind turbine's energy-capturing column to oscillate back and forth to capture wind energy. These generators can effectively overcome the aforementioned drawbacks, offering simple structure, lower cost, and ease of distributed deployment.

[0003] The basic principle of wind-induced vortex-induced vibration generators (WEEGs) for capturing wind energy is as follows: when the incoming wind passes around its energy-capturing column, alternating vortices are generated. When the frequency of these vortex shedding is close to the natural frequency of the WEEG, resonance occurs, resulting in frequency locking. At this point, the efficiency of wind energy capture is highest. On the other hand, the natural frequency of the WEEG is mainly determined by system damping, system restoring torque, system mass, and its center of mass height. The system restoring torque is primarily provided by the interaction force between the flexible rod or permanent magnets. The restoring torque of the flexible rod is provided through its elastic deformation. Because the WEEG oscillation frequency is high, the requirements for the flexible rod material are high and difficult to control. In contrast, the magnetic restoring torque scheme generated by the interaction force between ring magnets is lower in cost and has no energy loss. Therefore, accurately measuring the change of the magnetic restoring torque of the system with the swing angle of the energy-harvesting column is of great reference value and engineering significance for improving the energy harvesting efficiency of wind-induced vortex-induced vibration generators. However, current research on vortex-induced vibration generators mainly focuses on the mutual coupling mechanism between the energy-harvesting column and the incoming wind to improve the efficiency of the energy-harvesting column in capturing wind energy, while research on its magnetic restoring torque is very limited. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a testing device for the magnetic restoring torque of a wind-induced vortex-induced vibration generator, which is simple in structure, reliable in operation, and capable of accurately measuring the relationship between the swing angle of a swinging permanent magnet and the magnetic restoring torque.

[0005] The technical solution of the present invention to solve the above problems is: a testing device for the magnetic restoring torque of a wind-induced vortex-induced vibration generator, characterized in that: it includes a swing angle driving and limiting system, a measurement system, and a magnetic restoring torque generation and transmission system;

[0006] The swing angle driving and limiting system includes a swing angle limiting disk, a swing angle driving disk, and a swing angle positioning pin. A rotating hole at the center of the swing angle driving disk is mounted on a rotating shaft at the center of the swing angle limiting disk, allowing the swing angle driving disk to rotate around the rotating shaft. The swing angle limiting disk has multiple angle limiting holes evenly distributed radially. The swing angle driving disk has multiple sets of angle positioning holes, the number of sets being the same as the number of angle limiting holes on the swing angle limiting disk, and each set of angle positioning holes corresponds to the radial position of an angle limiting hole. The number of sets of angle positioning holes is denoted as M, and the number of angle positioning holes in each set is denoted as N. The central angle between the j-th angle positioning hole in the i-th group and the j-th angle positioning hole in the (i+1)-th group is θ1. The central angles of two adjacent angle positioning holes within each group are the same, both being θ2. The central angle between the 1-th angle positioning hole in the 1-th group and the N-th angle positioning hole in the M-th group is θ, satisfying the following relationship:

[0007] θ2=θ1·M (1)

[0008] θ=θ1·M·(N+1) (2)

[0009] When the swing angle drive disk rotates, the swing angle positioning pin is inserted into the coaxial angle positioning hole and angle limiting hole to limit the rotation angle of the swing angle drive disk.

[0010] The magnetic restoring torque generation and transmission system includes a permanent magnet fixing plate, a swing shaft, a swing shaft support frame, a permanent magnet mounting bracket, two fixed permanent magnets, and a swing permanent magnet. The permanent magnet fixing plate is parallel to the swing angle limiting plate, fixedly mounted on the swing angle limiting plate, and coaxial with the swing angle limiting plate. The permanent magnet mounting bracket is fixedly mounted on the permanent magnet fixing plate, and two fixed permanent magnets are fixedly mounted on the permanent magnet fixing plate. The two fixed permanent magnets are annular and coaxial. The swing permanent magnet is fixedly mounted on the positioning part of the swing shaft through a swing permanent magnet limiting bushing and a swing permanent magnet positioning pin. The swing permanent magnet is located between the two fixed permanent magnets. The positioning part of the swing shaft passes through the central hole of the two fixed permanent magnets, and the initial position of the positioning part of the swing shaft is coaxial with the fixed permanent magnets.

[0011] The measurement system includes a torque meter and a laser rangefinder; the torque meter is placed on the swing angle drive disk and is fixedly connected to the swing shaft to measure the magnetic restoring torque transmitted by the swing shaft to the swing permanent magnet; the laser rangefinder is installed on the permanent magnet fixing disk, near the positioning part of the swing shaft, and the ranging laser is perpendicular to the initial position of the positioning part of the swing shaft.

[0012] Furthermore, a drive handle is provided on the outer circumference of the swing angle drive disc.

[0013] Furthermore, the swing angle drive plate is located between the permanent magnet fixing plate and the swing angle limiting plate, and the permanent magnet fixing plate is provided with a square observation hole.

[0014] Furthermore, the oscillating permanent magnet is mounted on the oscillating angle positioning pin via the oscillating permanent magnet limiting bushing and the oscillating permanent magnet positioning pin. The end of the positioning part of the oscillating angle positioning pin is placed on the oscillating shaft support frame, and the oscillating shaft support frame is mounted on the permanent magnet fixing plate.

[0015] Compared with the prior art, the beneficial effects of the present invention are: the present invention has a simple structure and is easy to operate. The present invention realizes the rotation of the swing angle drive disk around the swing angle limit disk by the drive handle on the swing angle drive disk, and drives the torque meter and the swing shaft to rotate, thereby realizing the rotation of the swing permanent magnet around the rotation axis of the swing angle drive disk. At the same time, the torque meter measures the magnitude of the magnetic restoring torque transmitted by the swing shaft to the swing permanent magnet, and the laser range sensor measures the swing distance of the swing shaft positioning part. After the swing distance is converted into an angle, the relationship between the swing angle of the swing permanent magnet and the magnetic restoring torque can be accurately obtained. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the test device of the present invention.

[0017] Figure 2 This is an exploded view of the overall structure of the testing device of the present invention.

[0018] Figure 3 This is a schematic diagram of the swing angle limiting disc of the present invention.

[0019] Figure 4 This is a schematic diagram of the swing angle drive disc of the present invention.

[0020] Figure 5 This is a schematic diagram of the positioning principle of the swing angle drive disk of the present invention.

[0021] Figure 6 This is a schematic diagram of the swing angle testing principle of the present invention.

[0022] Figure 7 This is a schematic diagram of the permanent magnet fixing of the present invention.

[0023] Figure 8 This is a schematic diagram illustrating the principle of generating a magnetic restoring torque.

[0024] Figure 9 This is a graph showing the relationship between the magnetic restoring torque and the oscillation angle. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] like Figure 1-2 As shown, a testing device for the magnetic restoring torque of a wind-induced vortex-induced vibration generator includes a swing angle driving and limiting system, a measurement system, and a magnetic restoring torque generation and transmission system.

[0027] The swing angle driving and limiting system includes a swing angle limiting disk 14, a swing angle driving disk 8, and a swing angle positioning pin 10. A rotating hole 82 at the center of the swing angle driving disk 8 is mounted on a rotating shaft 142 at the center of the swing angle limiting disk 14. A driving handle 84 is provided on the outer circumference of the swing angle driving disk 8, allowing the swing angle driving disk 8 to rotate freely around the rotating shaft 142 of the swing angle limiting disk 14 under the drive of the driving handle 84. The swing angle limiting disk 14 has multiple angle limiting holes 141, which are evenly arranged radially on the swing angle limiting disk 14. Figure 3 As shown. The swing angle drive disk 8 is provided with multiple sets of angle positioning holes 81. The number of sets of angle positioning holes 81 is the same as the number of angle limiting holes, and each set of positioning holes corresponds to the radial position of an angle limiting hole; for example. Figure 5 As shown, the number of groups of angle positioning holes is denoted as M, and the number of angle positioning holes in each group is denoted as N. The central angle between the j-th angle positioning hole in the i-th group and the j-th angle positioning hole in the (i+1)-th group is θ1. The central angle between any two adjacent angle positioning holes in each group is the same, θ2. The central angle between the 1-th angle positioning hole in the 1-th group and the N-th angle positioning hole in the M-th group is θ, satisfying the following relationship:

[0028] θ2=θ1·M (1)

[0029] θ=θ1·M·(N+1) (2)

[0030] When the swing angle drive disk 8 rotates, an angle positioning hole 81 on it is coaxial with an angle limiting hole 141 on the swing angle limiting disk 14. The swing angle positioning pin 10 is inserted into the coaxial angle positioning hole 81 and angle limiting hole 141 to limit the rotation angle of the swing angle drive disk 8.

[0031] The magnetic restoring torque generation and transmission system includes a permanent magnet fixing plate 2, a swing shaft 3, a permanent magnet mounting bracket 12, a fixed permanent magnet 4, a swing permanent magnet 5, a fixed permanent magnet 11, a swing permanent magnet limiting sleeve 13, a swing permanent magnet positioning pin 6, and a swing shaft support frame 9. The permanent magnet fixing plate 2 is parallel to the swing angle limiting plate 14, fixedly mounted on the swing angle limiting plate 14, and coaxial with the swing angle limiting plate 14. The permanent magnet mounting bracket 12 is fixedly mounted on the permanent magnet fixing plate 2, and the fixed permanent magnet 4 and the fixed permanent magnet 11 are fixedly mounted on the permanent magnet mounting bracket 12. The fixed permanent magnet 4 and the fixed permanent magnet 11 are annular and coaxial. The swing permanent magnet 5 is fixedly mounted on the positioning part of the swing shaft 3 through the swing permanent magnet limiting sleeve 13 and the swing permanent magnet positioning pin 6. The swing permanent magnet 5 is located between the fixed permanent magnet 4 and the fixed permanent magnet 11. The positioning part of the swing shaft 3 passes through the central hole of the fixed permanent magnet 4 and the fixed permanent magnet 11, and the initial position of the positioning part of the swing shaft 3 is coaxial with the fixed permanent magnet 4.

[0032] The measurement system includes a torque meter 1 and a laser rangefinder 7. The torque meter 1 is placed on the swing angle drive disk 8 and positioned by multiple positioning blocks 83. The test module of the torque meter 1 is fixedly connected to the swing shaft 3 to measure the magnetic restoring torque transmitted by the swing permanent magnet 5 via the swing shaft 3. The laser rangefinder 7 is mounted on the permanent magnet fixing disk 2 by multiple positioning blocks 21 and is positioned close to the positioning part of the swing angle positioning pin 10. The ranging laser is perpendicular to the initial position of the positioning part of the swing angle positioning pin 10, such as... Figure 6 As shown.

[0033] Let M be the number of groups of angle positioning holes on the swing angle drive disc 8, and N be the number of angle positioning holes in each group. Figure 5 As shown. The central angle between the j-th angular positioning hole in the i-th group and the j+1-th angular positioning hole in the (i+1)-th group is θ1, the central angle between the two adjacent groups of angular positioning holes is θ2, and the central angle between the 1-th angular positioning hole in the 1-th group and the N-th angular positioning hole in the M-th group is θ, and the relationship (1) and (2) are satisfied.

[0034] θ2=θ1·M (1)

[0035] θ=θ1·M·(N+1) (2)

[0036] Driven by the drive handle 84, the swing angle drive disk 8 rotates around the rotation axis 142 of the swing angle limiting disk 14, and inserts the swing angle positioning pin 10 into the angle positioning hole and angle limiting hole coaxial with the swing angle drive disk 8 and the swing angle limiting disk 14, so that the swing angle drive disk 8 rotates with θ2 as the angle increment, and its maximum swing limiting angle is β.

[0037] Eight bolts are evenly distributed on the swing angle limiting plate 14, namely two positioning bolts 144 and six fixing bolts 143. The permanent magnet fixing plate 2 is fixedly connected to the swing angle limiting plate 14 via the positioning bolts 144 and the fixing bolts 143. To facilitate observation of the torque value measured by the torque meter, a square observation hole 22 is provided on the permanent magnet fixing plate 2, such as... Figure 1 , Figure 2 , Figure 3 and Figure 6 As shown. To prevent the swing shaft 3 from sagging due to gravity, the end of the positioning part of the swing shaft 3 is placed on the swing shaft support frame 9, which is mounted on the permanent magnet fixing plate 2, as shown. Figure 1 , Figure 2 and Figure 7 As shown.

[0038] The laser rangefinder 7 is mounted on one side of the positioning part of the swing shaft 3 via a positioning block on the permanent magnet fixing plate 2, such as... Figure 6 As shown; the horizontal distance between the ranging laser 71 and the rotation axis 142 of the swing angle limiting disk 14 is L. When the swing shaft 3 drives the swing permanent magnet 5 to rotate, the laser ranging sensor 7 measures the real-time position of the positioning part of the swing shaft 3. By comparing it with the initial position of the positioning part of the swing shaft 3, the distance change Δl is obtained. The distance change Δl and the swing angle ω satisfy the following relationship:

[0039] ω=arctan(Δl / L) (3)

[0040] The magnetic induction vectors generated by the fixed permanent magnets 4 and 11 on the permanent magnet mounting bracket 12 at any infinitesimal point P(x,y,z) on the oscillating permanent magnet 5 are respectively B A B C Its magnetic flux density resultant vector B = B A +B B .like Figure 8 As shown, the magnetic force at the infinitesimal element P(x,y,z) satisfies the following equation:

[0041] dF=J m ×BdS (4)

[0042] J m Given the magnetizing current density of the oscillating permanent magnet 5, the magnetic restoring torque at point P(x,y,z) is:

[0043] dM x =dF z ·y-dF y ·x (5)

[0044] The magnetic recoil couple torque experienced by the oscillating permanent magnet 5 is:

[0045]

[0046] Under the action of the drive handle 84, the swing angle drive disk 8 rotates around the rotation axis on the swing angle limit disk 14, and drives the swing shaft 3 fixedly connected to it to rotate together, thereby causing the swing permanent magnet 5 to deviate from its equilibrium position. Under the combined action of the fixed permanent magnet 4 and the fixed permanent magnet 11, a magnetic restoring torque opposite to its rotation direction is generated on the swing permanent magnet 5, which is transmitted to the torque meter 1 through the swing shaft, thereby measuring the magnetic restoring torque M. x Size. Meanwhile, the laser rangefinder 7 measures the distance between itself and the positioning part of the swing shaft 3 at this time, and calculates the swing angle of the swing shaft 3 using equation (3), thus obtaining the relationship curve between the magnetic restoring torque and the swing angle, as shown in... Figure 9 As shown.

Claims

1. A testing device for the magnetic restoring torque of a wind-induced vortex-induced vibration generator, characterized in that: The system includes a swing angle driving and limiting system, a measuring system, and a magnetic restoring torque generation and transmission system. The swing angle driving and limiting system includes a swing angle limiting disk, a swing angle driving disk, and a swing angle positioning pin. The rotating hole at the center of the swing angle driving disk is mounted on the rotating shaft at the center of the swing angle limiting disk, and the swing angle driving disk can rotate around the rotating shaft of the swing angle limiting disk. The swing angle limiting disk is provided with multiple angle limiting holes, which are evenly arranged radially on the swing angle limiting disk. The swing angle drive disc has multiple sets of angle positioning holes. The number of sets of angle positioning holes is the same as the number of angle limiting holes, and each set of angle positioning holes corresponds to the radial position of an angle limiting hole. The number of sets of angle positioning holes is denoted as follows: The number of angular positioning holes in each group is denoted as , No. i Group 1 j The first angular positioning hole and the first i Group +1 j The central angle of each angular positioning hole is The central angles of two adjacent angular positioning holes in each group are the same. The first angular positioning hole in the first group and the first... Group 1 The central angle of each angular positioning hole is It satisfies the following relationship: (1)； (2)； When the swing angle drive disk rotates, the swing angle positioning pin is inserted into the coaxial angle positioning hole and angle limiting hole to limit the rotation angle of the swing angle drive disk. The magnetic restoring torque generation and transmission system includes a permanent magnet fixing plate, a swing shaft, a swing shaft support frame, a permanent magnet mounting bracket, two fixed permanent magnets, and a swing permanent magnet. The permanent magnet fixing plate is parallel to the swing angle limiting plate, fixedly mounted on the swing angle limiting plate, and coaxial with the swing angle limiting plate. The permanent magnet mounting bracket is fixedly mounted on the permanent magnet fixing plate, and two fixed permanent magnets are fixedly mounted on the permanent magnet fixing plate. The two fixed permanent magnets are annular and coaxial. The swing permanent magnet is fixedly mounted on the positioning part of the swing shaft through a swing permanent magnet limiting bushing and a swing permanent magnet positioning pin. The swing permanent magnet is located between the two fixed permanent magnets. The positioning part of the swing shaft passes through the central hole of the two fixed permanent magnets, and the initial position of the positioning part of the swing shaft is coaxial with the fixed permanent magnets. The measurement system includes a torque meter and a laser rangefinder; the torque meter is placed on the swing angle drive disk and is fixedly connected to the swing shaft to measure the magnetic restoring torque of the swing permanent magnet transmitted by the swing shaft; the laser rangefinder is installed on the permanent magnet fixing disk, near the positioning part of the swing shaft, and the ranging laser is perpendicular to the initial position of the positioning part of the swing angle positioning pin.

2. The testing device for the magnetic restoring torque of a wind-induced vortex-induced vibration generator according to claim 1, characterized in that: The swing angle drive disc has a drive handle on its outer circumference.

3. The testing device for the magnetic restoring torque of a wind-induced vortex-induced vibration generator according to claim 1, characterized in that: The swing angle drive plate is located between the permanent magnet fixed plate and the swing angle limit plate, and the permanent magnet fixed plate is provided with a square observation hole.

4. The testing device for the magnetic restoring torque of a wind-induced vortex-induced vibration generator according to claim 1, characterized in that: The oscillating permanent magnet is mounted on the oscillating shaft via the oscillating permanent magnet limiting bushing and the oscillating permanent magnet positioning pin. The end of the oscillating shaft positioning part is placed on the oscillating shaft support frame, and the oscillating shaft support frame is mounted on the permanent magnet fixing plate.

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