An ultra-low frequency electromagnetic dual-tuned mass-inertial damper

Abstract

The application discloses a kind of super low frequency electromagnetic double-tuned mass-inertia damper, including tuning spring, motor, flywheel, constant force spring, torsional spring, tuning mass and mounting bracket;Mounting bracket bottom is equipped with pulley I, mounting bracket top is fixedly installed with top plate, top plate is installed with motor, pulley II and spring mounting frame, and the output shaft of motor is coaxially connected with the axle of pulley II through torsional spring, flywheel is installed on the output shaft of motor, and pulley I and pulley II are connected by belt;The tuning mass is located below the top plate, and the tuning mass is connected with the top of spring mounting frame by tuning spring and constant force spring;Tuning mass is connected with belt by lock belt clamp.The application has simple structure, is easy to install, and has low cost, which realizes double-tuned electromagnetic energy consumption, further improves the damping performance, introduces constant force spring neutral damper gravity, and solves the problem of offshore semi-submersible floating wind turbine platform super low frequency vibration control.

Description

Technical Field

[0001] This invention belongs to the field of damper technology, and in particular relates to an ultra-low frequency electromagnetic dual-tuned mass-inertial mass damper. Background Technology

[0002] Due to the complex structure of floating wind turbine systems and the complex operating environment at sea, semi-submersible floating offshore wind turbine (SS-FOWT) platforms are prone to large-scale low-frequency vibrations under the coupled effects of wind, waves, and currents. This can lead to large deformations at the tower top and blade tips, affecting the power generation efficiency and safe operation of the wind turbine, and severely restricting the further development of wind power technology in my country. To address the ultra-low-frequency vibrations of SS-FOWT floating platforms, considering their geometric characteristics, the most effective approach is to install vertical dampers on the platform for vibration control. However, existing tuned vibration damping devices are insufficient to meet the new challenges of controlling ultra-low-frequency vibrations of SS-FOWT floating platforms, exhibiting problems such as excessive static elongation. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides an ultra-low frequency electromagnetic dual-tuned mass-inertial damper that is simple in structure, easy to install, low in cost, and capable of tuning large-amplitude ultra-low frequency vibrations occurring on semi-submersible floating wind turbine platforms.

[0004] The technical solution adopted in this invention is: An ultra-low frequency electromagnetic dual-tuned mass-inertia damper includes a tuning spring, a motor, a flywheel, a constant force spring, a torsion spring, a tuning mass block, and a mounting bracket. A pulley I is mounted at the bottom of the mounting bracket, and a top plate is fixedly mounted on the top of the mounting bracket. The top plate is equipped with a motor, pulley II, and a spring mounting bracket. The output shaft of the motor is coaxially connected to the axle of pulley II via a torsion spring. A flywheel is mounted on the output shaft of the motor. Pulley I and pulley II are connected by a belt. The tuning mass block is located below the top plate and is connected to the top of the spring mounting bracket via the tuning spring and the constant force spring. The tuning mass block and the belt are connected by a belt clamp. When vibration occurs, the vertical movement of the tuning mass block drives the belt, which in turn drives pulley II to rotate. The rotation of pulley II then drives the connecting rod on the adjustable motor mounting bracket to rotate, which in turn drives the torsion spring to rotate, and finally drives the rotation of the motor and flywheel. The torsion spring provides tuning stiffness, the rotating motor and flywheel provide inertia, and the rotating motor provides electromagnetic damping.

[0005] Furthermore, a tensioning wheel is installed on the bottom surface of the top plate. The tensioning wheel is located outside the belt and can tension the belt.

[0006] Furthermore, the mounting bracket includes four support rods, which are fixedly installed at the four corners of the base plate, and the top plate is installed on the four support rods; the pulley I is installed on the base plate; and the tuning mass block is located between the four support rods.

[0007] Furthermore, the spring mounting bracket is T-shaped, with the vertical beam of the spring mounting bracket mounted on the top plate and set perpendicular to the top plate; the upper ends of the tuning spring and the constant force spring are mounted on the horizontal beam of the spring mounting bracket, and the tuning spring and the constant force spring are located on both sides of the vertical beam.

[0008] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention has a simple structure, is easy to install, and has low cost; it is equipped with a flywheel, and the inertial mass generated by the flywheel can be much greater than its own physical mass, which greatly improves the vibration reduction performance of the present invention.

[0009] The motor of the present invention can generate parallel inertial mass and damping force during the rotational power generation process, and can simultaneously achieve the energy dissipation effect of inertial mass and electromagnetic damping.

[0010] This invention replaces the traditional viscous damper with an electromagnetically tuned inertial mass damper based on a rotating motor, flywheel, and torsion spring, which can achieve a dual tuning effect and further improve the damping performance.

[0011] This invention features a constant force spring, whose force output is constant. Therefore, this invention utilizes a constant force spring to neutralize gravity and uses a traditional spring for tuning, effectively overcoming the problem of excessive static elongation of the spring in traditional vertically tuned vibration dampers when optimizing vibration reduction for low-frequency vibrations. Attached Figure Description

[0012] Figure 1 This is the front view of the present invention.

[0013] Figure 2 This is a perspective view of the present invention. Detailed Implementation

[0014] The present invention will now be described clearly and completely with reference to the accompanying drawings.

[0015] like Figure 1-2 As shown, the present invention includes a spring mounting bracket 1, a tuning spring 2, a motor, a flywheel 3, a torsion spring 4, a tuning mass block 5, a locking belt clip 6, a belt 7, a base plate 8, a constant force spring 9, a pulley II 10, a mounting bracket, a top plate 13, a bolt 14, a tensioning wheel 15, a support rod 16, and a pulley I 17.

[0016] The mounting bracket includes four support rods 16, a top plate 13, and a bottom plate 8. The four support rods 16 are fixedly installed at the four corners of the bottom plate 8, and the top plate 13 is mounted on the four support rods 16. The pulley I 17 is mounted on the bottom plate 8 and is rotatable. The tuning mass 5 is located between the four support rods 16. The space enclosed by the four vertical support rods 16 provides space for the vertical movement of the tuning mass 5, and the movement path of the tuning mass 5 can be controlled by adjusting the length of the vertical support rods 16. When encountering vibration, the vertical movement of the tuning mass drives the belt, which in turn drives the pulley II to rotate. The rotation of the pulley II then drives the connecting rod on the adjustable motor mounting bracket to rotate, which in turn drives the torsion spring to rotate, and finally drives the rotation of the motor and flywheel. The torsion spring provides tuning stiffness, the rotating motor and flywheel provide inertia, and the rotating motor provides electromagnetic damping.

[0017] The spring mounting bracket 1 is T-shaped, with its vertical beam mounted on the top plate 13 and perpendicular to it. The upper ends of the tuning spring 2 and the constant force spring 9 are mounted on the horizontal beam of the spring mounting bracket, and are located on both sides of the vertical beam. The lower ends of both the tuning spring 2 and the constant force spring 9 are connected to the tuning mass block 5.

[0018] The top plate 13 is equipped with a motor bracket and a pulley bracket. A motor is mounted on the motor bracket, and a pulley II 10 is mounted on the pulley bracket. The output shaft of the motor and the axle of pulley II 10 are coaxially connected via a torsion spring 4. A flywheel 3 is mounted on the motor's output shaft. The torsion spring 4 serves to adjust the stiffness. Pulley II 10 and pulley I 17 are connected by a belt 7. The tuning mass 5 is located below the top plate 13 and is connected to the belt 7 via a belt clamp 6. A tensioning wheel 15 is mounted on the bottom surface of the top plate 13, located outside the belt 7, and is used to tension the belt 7.

[0019] This invention fully considers the installation space on semi-submersible floating wind turbine platforms. It can be analyzed in two levels. First, based on a traditional tuned mass-inertial damper, electromagnetic damping is introduced to form an electromagnetic tuned mass-inertial damper. Then, the electromagnetic tuned mass-inertial damper replaces the viscous damping unit in the classic TMD, and a constant force spring 9 is introduced, ultimately forming an ultra-low frequency electromagnetic dual-tuned mass-inertial damper.

[0020] When vibration occurs, the vertical movement of the tuning mass 5 drives the movement of the belt 7, which in turn drives the pulley II 10 to rotate. The rotation of pulley II 10 then drives the connecting rod 12 on the adjustable motor mounting bracket 11 to rotate, which in turn drives the rotation of the torsion spring 4, and finally drives the rotation of the motor and flywheel 3. The torsion spring 4 provides tuning stiffness, the rotating motor and flywheel 3 provide inertia, and the rotating motor provides electromagnetic damping. In this invention, by introducing the concept of mass augmentation of the rotating flywheel, a large moment of inertia effect is achieved with a small physical mass.

Claims

1. An ultra-low frequency electromagnetic dual-tuned mass-inertial mass damper, characterized in that: The system includes a tuning spring, a motor, a flywheel, a constant force spring, a torsion spring, a tuning mass, and a mounting bracket. A pulley I is mounted at the bottom of the mounting bracket, and a top plate is fixedly mounted on the top of the bracket. The top plate houses the motor, pulley II, and a spring mounting bracket. The output shaft of the motor is coaxially connected to the axle of pulley II via a torsion spring. A flywheel is mounted on the output shaft of the motor. Pulley I and pulley II are connected by a belt. The tuning mass is located below the top plate and is connected to the top of the spring mounting bracket via the tuning spring and the constant force spring. The tuning mass is connected to the belt via a belt clamp. When vibration occurs, the vertical movement of the tuning mass drives the belt, which in turn rotates pulley II. The rotation of pulley II then drives the connecting rod on the adjustable motor mounting bracket to rotate, which in turn drives the torsion spring to rotate, ultimately causing the motor and flywheel to rotate. The torsion spring provides tuning stiffness, the rotating motor and flywheel provide inertia, and the rotating motor provides electromagnetic damping.

2. The ultra-low frequency electromagnetic dual-tuned mass-inertial damper according to claim 1, characterized in that: A tensioning wheel is installed on the bottom surface of the top plate. The tensioning wheel is located outside the belt and can tension the belt.

3. The ultra-low frequency electromagnetic dual-tuned mass-inertial damper according to claim 1, characterized in that: The mounting bracket includes four support rods, which are fixedly installed at the four corners of the base plate, and the top plate is installed on the four support rods; the pulley I is installed on the base plate; and the tuning mass block is located between the four support rods.

4. The ultra-low frequency electromagnetic dual-tuned mass-inertial damper according to claim 1, characterized in that: The spring mounting bracket is T-shaped, with the vertical beam of the spring mounting bracket mounted on the top plate and perpendicular to the top plate; the upper ends of the tuning spring and the constant force spring are mounted on the horizontal beam of the spring mounting bracket, and the tuning spring and the constant force spring are located on both sides of the vertical beam.

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