WO2021012578A1

WO2021012578A1 - Self-adaption variable damping vortex-induced vibration energy conversion device

Info

Publication number: WO2021012578A1
Application number: PCT/CN2019/123270
Authority: WO
Inventors: 沈中祥; 许星宇; 尹群; 杨国德; 姚潇; 石天赐
Original assignee: 江苏科技大学; 江苏科技大学海洋装备研究院
Priority date: 2019-07-22
Filing date: 2019-12-05
Publication date: 2021-01-28
Also published as: CN110410261B; CN110410261A

Abstract

Provided is a self-adaption variable damping vortex-induced vibration energy conversion device, comprising: a vibrator system (1) and a damping system (2), the damping system (2) comprises a magnetorheological fluid damper (2-7), the magnetorheological fluid damper (2-7) comprises a damper piston rod (2-1) arranged in an outer cylinder wall (2-3), and the outer cylinder wall (2-3) is fully filled with magnetorheological fluid, an outer wrapping pipe (2-4) is rigidly connected outside the outer cylinder wall (2-3), damping coils (2-5) are distributed in the outer wrapping pipe (2-4), multiple magnetic separation layers (2-6) are clamped in the outer cylinder wall (2-3), the vibrator system (1) is positioned under a streamlined support rod (1-2), and is transversely arranged in a vertical water current flowing direction, the magnetorheological fluid damper (2-7) is connected above the vibrator system (1) through the damper piston rod (2-1).

Description

Adaptive variable damping vortex-induced vibration energy conversion device

Technical field

The invention relates to vortex-induced vibration, in particular to an adaptive variable damping vortex-induced vibration energy conversion device.

Background technique

With the progress and development of the times, the demand for energy in all countries is increasing day by day. The exhaustion of terrestrial non-renewable energy and the shortage of renewable energy have caused all countries to focus on the vast ocean. Various marine structures have gradually moved into the deep sea. Whether they can adapt to the complex and changeable sea conditions is not only a measure of the ability to obtain energy, but also a contest of overall national strength.

Tidal current energy is stored in the ocean and has the advantages of high energy density, large reserves, and wide distribution. It is favored by researchers from various countries. From the perspective of fluid analysis, any non-streamlined object, at a certain constant flow rate, will alternately produce vortices separated from the surface of the structure on both sides of the object, and the object will vibrate periodically. This fluid has an effect on the non-streamlined structure. It is called vortex induced vibration. In recent years, researchers and engineers believe that vortex-induced vibration is a harmful phenomenon. When the vortex frequency of the flow field formed by the fluid flowing through the structure is close to the natural frequency of the structure, resonance will occur, causing damage to the structure. Therefore, many studies focus on reducing the impact of vortex-induced vibration on marine pipe strings, bridges, etc.

However, with vortex-induced vibration, when the flow velocity is not high, the structure can also produce great vibration. Most of the kinetic energy of the fluid is absorbed by the vibrating structure, forming a stable periodic oscillation motion. When the Reynolds number of the system and the natural frequency of the vibration of the structure are reasonably controlled, a larger driving force and amplitude can be obtained at a lower flow rate.

The energy capture of vortex-induced vibration is related to the natural frequency of the vibrator and the frequency of the shedding wake vortex. However, it is difficult to achieve the optimization of energy capture and achieve smooth energy conversion.

Summary of the invention

1. Technical problems to be solved:

Although most of the vortex-induced vibrations are harmful, the vortex-induced vibration can produce a large driving force. The energy capture of the vortex-induced vibration is related to the natural frequency of the vibrator and the frequency of the shedding wake vortex. However, it is difficult to achieve the optimization and maximization of energy capture, and the smooth conversion of energy can be achieved.

2. Technical scheme:

In order to solve the above problems, the present invention provides an adaptive variable damping vortex-induced vibration energy conversion device, which includes a vibrating system and a damping system. The damping system includes a magnetorheological fluid damper, and the magnetorheological fluid damper includes The damper piston rod, the damper piston disc envelops the damper piston rod and is arranged in the outer cylinder wall, and the outer cylinder wall is filled with magnetorheological fluid. The space formed between the outer cylinder wall and the damper piston disc is Damping passage, the upper and lower parts of the outer cylinder wall are left with a certain gap, the outer cylinder wall is rigidly connected to an outer tube, and damping coils are distributed inside the outer tube, and the outer cylinder wall is sandwiched with multiple layers In the magnetic barrier layer, the vibrating system is located below the streamlined support rod and arranged laterally in the vertical water flow direction, and the upper side of the vibrating system is connected with the magnetorheological fluid damper through the damper piston rod.

The vibrator system includes a plurality of vibrators and streamlined support rods, the plurality of vibrators are arranged in parallel in a closed fixed frame, and the popular support rods are rigidly perpendicular to the vibrator and pass through the fixed plate. The fixed plate Parallel to the vibrator, the fixed plate and the upper fixed frame are connected by a column, and the vibrator is cylindrical.

The damper piston disc is provided with an extended part of the inner channel piston disc, and the inner channel piston disc completely separates the damping channel.

The vibrator system is assembled in a certain density array, the first-stage vibrator array is the upstream vibrator, and the second-stage vibrator array is the downstream vibrator.

The damping system also includes a linear spring. The linear spring includes a sliding rod, a sleeve, and a spring. The sliding rod is embedded in the sleeve and can move up and down in the sleeve. The two ends of the spring are respectively It is rigidly connected with the root of the sleeve and the upper end of the sliding rod, the upper end of the sliding rod is rigidly connected with the beam of the damper piston rod, and the lower end of the sleeve is rigidly connected with the outer tube.

The springs are arrayed above the outer tube at an angle of every 60°.

It also includes an end cover, which completely closes the upper and lower ends of the outer cylinder wall and is rigidly connected with the outer cylinder wall.

It also includes a base. The base includes a primary base, a secondary base, a bearing, an azimuth motor, an azimuth motor gear, an adjustment gear, and a fluid sensor. The primary base is used for rigid connection with a large offshore structure , The secondary base is movably connected with the primary base through the bearing, the azimuth motor is rigidly connected to one side of the primary base, the azimuth motor gear is mounted above the azimuth motor, and the adjusting gear is rigidly connected with the secondary base and is connected to the azimuth The motor meshes with the adjusting gear. The secondary base and the adjusting gear are rigidly connected with the outer cylinder wall and under the outer tube, and the fluid sensor is rigidly connected under the primary base.

It also includes an energy converter. The energy converter includes a permanent magnet, a bracket, a coil and a rectifier. The permanent magnet is rigidly connected to the top of the damper piston rod. Below the coil part is reserved for the vibration of the damper piston rod. The bracket is rigidly connected with the coil, the bracket is rigidly connected with the upper part of the outer tube, and a rectifier is installed above the coil.

3. Beneficial effects:

The invention provides an adaptive variable damping vortex-induced vibration energy conversion device that can adjust the vibration frequency of the structure to maximize the power supply. The device is applied to marine structures, which can convert the kinetic energy of vortex-induced vibration into electric power to supply the load of the platform, and can adjust the vibration frequency of the structure through the damper. When it is close to the vortex-induced vibration, the frequency of wake vortex discharge can realize energy Maximize the collection.

Description of the drawings

Figure 1 is a structural diagram of a magnetorheological damper.

Figure 2 is a schematic diagram of the structure of the oscillator system.

Figure 3 is a structural diagram of the damping system.

Figure 4 is a diagram of the damper piston rod and piston disc.

Figure 5 is a cross-sectional view taken along the line C-C of Figure 4

Figure 6 is a diagram of the outer tube and coil.

Figure 7 is a cross-sectional view taken along line B-B of Figure 6

Figure 8 is the working magnetic circuit diagram of the magnetorheological damping fluid.

Fig. 9 is a cross-sectional view taken along the line D-D in Fig. 8.

Figure 10 is a composition diagram of a linear spring.

Figure 11 is a structural diagram of the base.

Figure 12 is a structural diagram of the energy converter.

Figure 13 shows the overall composition of the device.

Figure 14 is a schematic diagram of an array of the vibrator system.

Detailed ways

The present invention will be described in detail below in conjunction with the drawings.

The present invention provides an adaptive variable damping vortex-induced vibration energy conversion device, which includes a vibrating system 1 and a damping system 2. The damping system 2 includes magnetorheological fluid dampers 2-7, as shown in FIG. 1, The magnetorheological fluid damper 2-7 includes a damper piston rod 2-1. The damper piston disk 2-2 encloses the damper piston rod 2-1 and is arranged in the outer cylinder wall 2-3, and the outer cylinder wall 2-3 is filled with magnetorheological fluid. The space formed between the outer cylinder wall 2-3 and the damper piston disc 2-2 is a damping channel 2-7-1. A certain gap is left in part, the outer cylinder wall 2-3 is rigidly connected to the outer tube 2-4, the outer tube 2-4 is provided with a damping coil 2-5, and the outer cylinder wall 2-3 is internally clamped There are multilayer magnetic barrier layers 2-6.

As shown in Figures 4-9, the damping coil 2-5 is distributed inside the outer tube 2-4, and the damping coil 2-5 is wound around the outer tube magnetic core 2-4-1 in the middle part of the permeable tube. The damping coil 2-5 is used to supply the magnetic flux of the magnetorheological fluid damper 2-7. The magnitude of the current of the damping coil 2-5 determines the magnitude of the magnetic flux, thereby affecting the damping output. The outer tube 2-4, the damper piston disc 2-2, and the outer cylinder wall 2-3 are all magnetic materials to form a closed magnetic circuit. The magnetic core passes through the outer cylinder wall 2-3 to the piston disc 2-2. The two ends of the piston disk 2-2 pass through the outer cylinder wall 2-3 to the magnetic core part of the outer tube 2-4, forming a closed magnetic circuit.

It also includes an end cover 2-8, which seals the upper and lower ends of the outer cylinder wall 2-3 to seal the magnetorheological fluid.

The vibrator system 1 is the energy capture system of the device, and is rigidly connected to the damper piston rod 2-1; it is located below the streamlined support rod 1-2, and is arranged transversely in the vertical water flow direction. The piston rod 2-1 and the magnetorheological fluid damper 2-7 are connected.

The vibrator 1-1 is arranged laterally in the direction of the vertical water flow, and a rigid vibrator with low mass ratio elastic support is adopted, and only a single degree of freedom reciprocating movement in the vertical direction is performed. There are equidistant arrangement and combined arrangement on the vibrator system 1 to change the response amplitude of the vibrator system 1.

As shown in Fig. 14, the vibrator system 1 is combined in a certain density array. The first-stage vibrator row is the upstream vibrator. When the first-stage vibrator row facing the flow direction alternately discharges vortices by vortex-induced vibration, the downstream vibrator row will gallop at this time. Compared with the vortex-induced vibration, galloping can be Increase the amplitude and frequency of the 1 oscillator system, and increase the energy output density

As shown in Figure 2, the vibrator system 1 includes a plurality of vibrators 1-1 and streamlined support rods 1-2, the plurality of vibrators 1-1 are arranged in parallel in a closed fixed frame, the popular support The rod 1-2 is rigidly perpendicular to the vibrator 1-1 and passes through the fixed plate 1-3. The fixed plate 1-3 is parallel to the vibrator 1-1, and the fixed plate 1-3 and the upper fixed frame are connected by a column. The vibrator 1-1 is cylindrical, that is, non-streamlined. Under the action of the incoming flow, it produces a reciprocating motion perpendicular to the incoming flow, that is, vortex-induced vibration, so as to convert the kinetic energy of the fluid into the mechanical energy of the vibrator system 1. The streamlined support rod 1-2 is less affected by the incoming flow and reduces the direct shear force.

The damper piston disc 2-2 is provided with an extended portion of the inner channel piston disc 2-2-1, and the inner channel piston disc 2-2-1 completely separates the damping channel 2-7-1. The inner channel piston disc 2-2-1 is an extension of the damper piston disc, which can completely separate the damping channel 2-7-1. In the outer cylinder wall 2-3, a certain neutral position is left in the upper and lower parts to allow the longitudinal movement of the damper piston rod 2-1, and the vortex-induced vibration of the lower part of the vibrator system 1 will only cause longitudinal vibration.

As shown in Figure 3, the damping system 2 further includes a linear spring 2-9. As shown in Figure 10, the linear spring 2-9 includes a sliding rod 2-9-1, a sleeve 2-9-2 and The spring 2-9-3, the sliding rod 2-9-1 is embedded in the sleeve 2-9-2 and can move up and down in the sleeve 2-9-2, the spring 2-9- 3 Both ends are rigidly connected with the root of the sleeve 2-9-2 and the upper end of the sliding rod 2-9-1, and the upper end of the sliding rod 2-9-1 is connected to the beam 2 of the damper piston rod 2-1. -1-1 is rigidly connected, the lower end of the sleeve 2-9-2 is rigidly connected to the outer tube 2-4.

One end of the damper piston rod 2-1 uniformly derives a 2-1-1 beam in the radial direction, and the other end is rigidly connected with the streamlined support rod 1-2 of the vibrator system 1.

The motion of the linear spring 2-9 can provide spring damping force to the vibrator system 1.

The springs 2-9-3 are arranged in an array above the outer tube 2-4 at an angle of every 60°, which effectively prevents the 2-1 damper piston rod 2-1 from torsional movement.

As shown in Figures 11 and 13, it also includes a base 3. The base 3 includes a primary base 3-1, a secondary base 3-2, a bearing 3-7, an azimuth motor 3-3, and an azimuth motor The gear 3-4, the adjusting gear 3-5, and the fluid sensor 3-6, and the primary base 3-1 is used for rigid connection with a large offshore structure. The secondary base 3-2 is movably connected with the primary base 3-1 through the bearing 3-7. The azimuth motor 3-3 is rigidly connected to one side of the first-level base 3-1, and the azimuth motor gear 3-4 is installed above the azimuth motor 3-3. The adjusting gear 3-5 is rigidly connected with the secondary base 3-2, and meshes with the gear of the azimuth motor 3-3. The secondary base 3-2 and the adjusting gear 3-5 are rigidly connected with the outer cylinder wall 2-3 and the outer tube 2-4. The fluid sensor 3-6 is rigidly connected under the primary base 3-1 to monitor the required fluid parameter data, and feedback the fluid parameter information to the 3-3 azimuth motor and the 2 damping system 3 to make adjustments. After the 3-3 azimuth motor receives the fluid signal, it rotates the 3-3 azimuth motor gear to drive the 3-5 adjustment gear so that the 1-1 vibrator is always perpendicular to the incoming flow direction.

The azimuth motor 3-3 can control the 3-4 azimuth motor gear, and the azimuth motor gear 3-4 meshes with the adjustment gear 3-5. When the azimuth is adjusted, the two components are rotated horizontally without causing up and down positions. The change.

As shown in FIG. 12, it also includes an energy converter 4, which includes a permanent magnet 4-1, a bracket 4-2, a coil 4-3, and a rectifier 4-4, and the permanent magnet 4-1 is rigidly connected At the top of the damper piston rod 2-1. The space required for the vibration of the 2-1-1 beam is reserved under the coil 4-3, and the bracket 4-2 is rigidly connected with the coil 4-3, and the bracket 4-2 is rigidly connected with the outer tube 2-4. A rectifier 4-4 is installed above the part. The rectifier can convert the collected alternating current into direct current and supply it to the load after filtering. The vibrator system 1 drives the permanent magnet 4-1 to reciprocate up and down, so that the coil cuts the magnetic induction line of the permanent magnet 4-1 to generate a current, which is rectified by the rectifier 4-4 to output a matched power supply to the external power grid.

In summary, the present invention can perform adaptive system damping adjustment during work, stably control output power, and can provide required electrical energy for the operations of various offshore structures. The structural design of the present invention can adapt to various more complicated sea conditions, enables the energy conversion device to operate safely and stably, realizes the efficient use of marine green energy, and does not cause pollution to the surrounding sea area.

When the device is operating normally, the fluid sensor 3-6 monitors the incoming flow direction, outputs incoming flow parameter information to the azimuth machine 3-3 and the damping system 2, and further adjusts the direction of the vibrator 1-1 so that the vibrator 1-1 is perpendicular to the incoming flow. The flow direction increases the energy available. To avoid excessive changes in the amplitude and frequency of the vibrator system 1 caused by sudden changes in the marine operating conditions, the damping system 2 can control its amplitude and frequency in time to make the device work in a stable environment and avoid the impact of inertial forces between the internal structures of the device. When the amplitude and frequency of the vibrating system 1 change, the magnetic flux in the damping channel 2-7-1 of the magnetorheological fluid damper 2-7 increases, and the magnetorheological fluid at the damping channel changes from a low-viscosity fluid to a high-viscosity low-flow The body provides damping to further adjust the amplitude and frequency of the oscillator system. At the same time, the external linear spring 2-9 provides spring damping force for the device.

When the tidal current energy is converted into the mechanical energy of the vibrator system, the vibrator system drives the permanent magnet 4-1 in the energy converter to reciprocate up and down, so that the coil 4-3 cuts the magnetic induction line to generate electric energy. After the current is rectified by the rectifier 4-4, it is transmitted to the external grid to provide electrical energy for the operation of the equipment.

Although the present invention has been disclosed as above in the preferred embodiments, they are not used to limit the present invention. Anyone familiar with the art can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be defined by the protection scope of the claims of this application.

Claims

An adaptive variable damping vortex-induced vibration energy conversion device, comprising a vibrating system (1) and a damping system (2), characterized in that: the damping system (2) includes a magnetorheological fluid damper (2-7), The magnetorheological fluid damper (2-7) includes a damper piston rod (2-1), and the damper piston disk (2-2) wraps the damper piston rod (2-1) and is arranged on the outer cylinder wall (2-3) inside, and the outer cylinder wall (2-3) is filled with magnetorheological fluid, the space formed between the outer cylinder wall (2-3) and the damper piston disc (2-2) is damping In the passage (2-7-1), a certain gap is left in the upper and lower parts of the outer cylinder wall (2-3), and the outer cylinder wall (2-3) is rigidly connected to the outer tube (2-4) , The damping coils (2-5) are distributed in the outer tube (2-4), the outer cylinder wall (2-3) is sandwiched with multilayer magnetic barrier layers (2-6), and the vibrator system (1) Located below the streamlined support rod (1-2), arranged horizontally in the vertical water flow direction, above the vibrating system (1) through the damper piston rod (2-1) and the magnetorheological fluid damper (2) -7) Connect.
The adaptive variable damping vortex-induced vibration energy conversion device according to claim 1, characterized in that: the vibrator system (1) includes a plurality of vibrators (1-1) and streamlined support rods (1-2), and the A plurality of vibrators (1-1) are arranged in parallel in a closed fixed frame, each of the vibrators (1-1) is arranged transversely in the direction of vertical water flow, and the popular brace (1-2) is rigid and vertical On the vibrator (1-1) and pass through the fixing plate (1-3), the fixing plate (1-3) is parallel to the vibrator (1-1), the fixing plate (1-3) and the upper fixing frame Connected by a column, the vibrator (1-1) is cylindrical.
The adaptive variable damping vortex-induced vibration energy conversion device according to claim 1, characterized in that: the damper piston disc (2-2) is provided with an extension portion inner channel piston disc (2-2-1), so The inner channel piston disc (2-2-1) completely separates the damping channel (2-7-1).
The adaptive variable damping vortex-induced vibration energy conversion device according to claim 1, characterized in that: the vibrator system (1) is combined in a certain density array, the first-stage vibrator array is the upstream vibrator, and the second-stage vibrator array It is the downstream vibrator.
The adaptive variable damping vortex-induced vibration energy conversion device according to claim 1, wherein the damping system (2) further comprises a linear spring (2-9), and the linear spring (2-9) comprises Slide bar (2-9-1), sleeve (2-9-2) and spring (2-9-3), said slide bar (2-9-1) is embedded in sleeve (2-9-2) And can move up and down pistons in the sleeve (2-9-2). The two ends of the spring (2-9-3) are connected with the root and sliding of the sleeve (2-9-2) respectively. The upper end of the rod (2-9-1) is rigidly connected, and the upper end of the sliding rod (2-9-1) is rigidly connected to the beam (2-1-1) of the damper piston rod (2-1), and the sleeve The lower end of the tube (2-9-2) is rigidly connected with the outer tube (2-4).
The adaptive variable damping vortex-induced vibration energy conversion device according to claim 5, wherein the springs (2-9-3) are arranged in an array at an angle of every 60° above the outer tube (2-4). .
The adaptive variable damping vortex-induced vibration energy conversion device according to claim 1, characterized in that it further comprises an end cover (2-8), said end cover (2-8) connecting the outer cylinder wall (2-3) The upper and lower ends are completely closed and rigidly connected with the outer cylinder wall (2-3).
The adaptive variable damping vortex-induced vibration energy conversion device according to any one of claims 1-7, characterized in that it further comprises a base (3), and the base (3) includes a primary base (3). -1), secondary base (3-2), bearing (3-7), orientation motor (3-3), orientation motor gear (3-4), adjusting gear (3-5), fluid sensor (3 -6), the primary base ((3-1)) is used for rigid connection with a large offshore structure, and the secondary base (3-2) is connected to the primary base (3-7) through the bearing (3-7) -1) Movable connection, the azimuth motor 3-3 is rigidly connected to one side of the primary base (3-1), the azimuth motor (3-3) is equipped with the azimuth motor gear (3-4), the adjustment gear (3) -5) Rigidly connected with the secondary base (3-2), and meshed with the azimuth motor (3-3) and the adjusting gear (3-5). The secondary base (3-2) and the adjusting gear (3-5) are rigidly connected with the outer cylinder wall (2-3) and under the outer tube (2-4), and the fluid sensor (3-6) is rigidly connected at the first level Below the base (3-1).
The adaptive variable damping vortex-induced vibration energy conversion device according to any one of claims 1-7, characterized in that it further comprises an energy converter (4), and the energy converter (4) comprises a permanent magnet (4). -1), bracket (4-2), coil (4-3) and rectifier (4-4), the permanent magnet (4-1) is rigidly connected to the top of the damper piston rod (2-1), the coil The space required for the vibration of the beam (2-1-1) of the damper piston rod (2-1) is reserved under the part 4-3, and the bracket (4-2) is rigidly connected with the coil (4-3). The bracket (4-2) It is rigidly connected to the upper part of the outer tube (2-4), and a rectifier (4-4) is installed above the coil (4-3).
The adaptive variable damping vortex-induced vibration energy conversion device according to claim 8, characterized in that it further comprises an energy converter (4), and the energy converter (4) comprises a permanent magnet (4-1), a bracket ( 4-2), the coil (4-3) and the rectifier (4-4). The permanent magnet (4-1) is rigidly connected to the top of the damper piston rod (2-1). The space required for the vibration of the beam (2-1-1) of the damper piston rod (2-1) is left, and the bracket (4-2) is rigidly connected with the coil (4-3), and the bracket (4-2) is connected to The upper part of the outer tube (2-4) is rigidly connected, and a rectifier (4-4) is installed above the coil (4-3).