Frequency-adjustable simple pendulum type tuning liquid mass damping device

Abstract

The invention relates to the technical field of vibration reduction, in particular to a frequency-adjustable simple pendulum type tuning liquid mass damping device which comprises a swing rod, a mass block, an open container and a damping liquid adjusting mechanism. One end of the swing rod is connected with a to-be-damped structure; the mass block is arranged at the other end of the rigid swing rod; the open container is arranged below the swing rod and used for containing damping liquid to provide damping for the mass block. The damping liquid adjusting mechanism comprises a damping liquid adjuster and a damping liquid container, the damping liquid container is used for containing damping liquid, and the damping liquid adjuster is connected with the damping liquid container and the open container through a pipeline and used for adjusting the depth of the damping liquid in the open container. The problem that an existing simple pendulum type tuned liquid mass damper cannot adapt to the frequency change control requirement, and consequently vibration cannot be effectively reduced under the specific condition can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of vibration reduction, and in particular to an adjustable frequency single pendulum type tuning liquid mass damping device. Background Art

[0002] Single pendulum TMD control frequency Where g is the acceleration of gravity and l is the pendulum length. It can be seen that when the control frequency of the single pendulum TMD is as low as 0.1 Hz, the pendulum length will reach 24.82 m, which seriously affects the stability and installation space of the TMD structure. In addition, both of the above two structural forms of TMD require special dampers to dissipate energy.

[0003] The lateral vibration sway frequency of a building is not only affected by the wind speed, but also by the wind direction. Under different wind directions, the wind acts on the building in different ways and points, resulting in different vibration characteristics of the building. For example, under a crosswind direction (such as a 90-degree wind direction), the lateral vibration of a building may be more significant than under a downwind direction (such as a 0-degree wind direction).

[0004] During the hoisting of large equipment, as the hoisting progresses, the length of the hoisting rope becomes shorter and shorter, and the control frequency will change. Or during the construction of the cantilever beam of a cable-stayed bridge, as the cantilever becomes longer and longer, the required control frequency will also change.

[0005] However, the existing single-pendulum tuned mass damper cannot adapt to the control requirements of frequency changes, resulting in the problem of inability to effectively reduce vibration under certain circumstances. Summary of the invention

[0006] In view of the defects existing in the prior art, the purpose of the present invention is to provide an adjustable frequency single pendulum tuned liquid mass damping device, which can solve the problem that the existing single pendulum tuned mass damper cannot adapt to the control requirements of frequency changes, resulting in the inability to effectively reduce vibration under certain circumstances.

[0007] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0008] In one aspect, the present invention provides an adjustable frequency single pendulum tuned liquid mass damping device, comprising:

[0009] A swing rod, one end of which is used to connect to the structure to be damped;

[0010] A mass block, which is arranged at the other end of the rigid pendulum;

[0011] An open container, which is arranged below the pendulum rod and is used to contain damping fluid to provide damping for the mass block;

[0012] The damping liquid regulating mechanism comprises a damping liquid regulator and a damping liquid container, wherein the damping liquid container is used to contain the damping liquid, and the damping liquid regulator is connected to the damping liquid container and an open container through a pipeline and is used to regulate the depth of the damping liquid in the open container.

[0013] In some optional schemes, the mass block has a containing space therein, and the device further includes a mass adjustment mechanism, which is connected to the containing space and is used to add or discharge mass fluid into or out of the containing space.

[0014] In some optional schemes, the rocker arm is a rigid rocker arm, a flow hole communicating with the accommodating space is provided in the rigid rocker arm, and the mass adjustment mechanism is communicated with the accommodating space through the flow hole.

[0015] In some optional schemes, a floating cover plate is provided in the accommodating space, which is mounted on the part of the rigid rocker arm extending into the bottom of the accommodating space, or is mounted on a connecting pipe connected to the flow hole and extending to the bottom of the accommodating space along the axial direction of the rigid rocker arm, and can move along the axial direction of the rigid rocker arm and float above the damping fluid.

[0016] In some optional schemes, the mass block is in the shape of an inverted truncated cone, and the space for containing the damping fluid in the open container is in the shape of a cylinder.

[0017] In some optional schemes, the accommodating space is in the shape of an inverted frustum, and the floating cover plate includes a horizontal cover plate and a plurality of rotating cover plates, the horizontal cover plate is sleeved on the rigid rocker rod or the connecting tube, and can move in the axial direction of the rigid rocker rod or the connecting tube with the height of the mass fluid, and the plurality of rotating cover plates are circumferentially arranged on the outer edge of the horizontal cover plate, one end of which is rotatably connected to the horizontal cover plate, and the other end of which is overlapped on the inner wall of the mass block.

[0018] In some optional schemes, it also includes a vibration monitoring mechanism and a control unit, wherein the vibration monitoring mechanism is used to monitor the vibration frequency of the structure to be damped, and the control unit is used to obtain the vibration frequency monitored by the vibration monitoring mechanism, and control the damping fluid adjusting mechanism to adjust the height of the damping fluid in the open container and / or control the mass adjusting mechanism to add or discharge mass fluid into the accommodating space according to the vibration frequency.

[0019] In some optional solutions, the control unit is based on Determine the ratio of the mass buoyancy to gravity, γ;

[0020] according to Determine the displacement volume V of the mass block 排 ;

[0021] According to the displacement volume V of the mass block排 , determining the height of the damping fluid in the open container;

[0022] Where f is the vibration frequency monitored by the vibration monitoring mechanism, L is the pendulum length, λ is the ratio of the inertial mass of the liquid to the weight of the mass block, γ is the ratio of the buoyancy of the mass block to the gravity, g is the gravitational acceleration, m is the mass of the mass block, ρ is the density of the damping liquid, and δ m is the inertial mass of the liquid.

[0023] In some optional schemes, a flexible buffer material is provided at the bottom of the mass block, and the flexible buffer material is spaced apart from the bottom of the open container, and the mass block contacts the bottom of the open container when the rocker swings to a set angle.

[0024] In some optional schemes, the swing rod includes a long swing rod, a universal joint and a plurality of short swing rods, and flanges for connection are provided between the long swing rod, the universal joint and the short swing rods.

[0025] Compared with the prior art, the advantages of the present invention are: when it is necessary to adjust the control frequency of the entire damping device, the depth of the damping liquid in the open container is adjusted by the damping liquid regulating mechanism. If it is necessary to reduce the control frequency of the entire damping device, the damping liquid regulator extracts damping liquid from the damping liquid container through a pipeline and adds it to the open container, so that the damping liquid level in the open container increases. If it is necessary to increase the control frequency of the entire damping device, the damping liquid regulator extracts damping liquid from the open container through a pipeline into the damping liquid container, so that the damping liquid level in the open container decreases. This solution can perform adaptive adjustment of the control frequency according to different controlled frequencies, thereby improving the adaptability of the entire device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 It is a structural schematic diagram of an adjustable frequency single pendulum type tuned liquid mass damping device in an embodiment of the present invention;

[0028] Figure 2 Schematic diagram of the swing of the mass block in an embodiment of the present invention;

[0029] Figure 3 Schematic diagram of the force of the mass block in the embodiment of the present invention;

[0030] Figure 4 is a schematic structural diagram of a mass block in an embodiment of the present invention;

[0031] Figure 5 It is a structural schematic diagram of a floating cover plate in an embodiment of the present invention;

[0032] Figure 6 Schematic diagram of the relationship between the immersion depth of the mass block and the frequency in an embodiment of the present invention;

[0033] Figure 7 Schematic diagram of the relationship between the immersion depth of the mass block and the damping ratio in an embodiment of the present invention;

[0034] In the figure: 1. rocker arm; 11. short rocker arm; 12. long rocker arm; 13. universal hinge; 2. open container; 21. stiffening rib; 3. mass block; 31. floating cover plate; 311. horizontal cover plate; 312. rotating cover plate; 313. sliding sleeve; 32. flexible buffer material; 33. connecting pipe; 4. damping fluid regulating mechanism; 41. damping fluid regulator; 42. damping fluid container; 5. mass regulating mechanism; 51. mass fluid regulator; 52. mass fluid container; 6. wind turbine tower; 71. mounting plate; 72. supporting plate. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0036] The embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0037] like Figure 1 As shown, on the one hand, the present invention provides an adjustable frequency single pendulum tuned liquid mass damping device, comprising: a pendulum 1, a mass block 3, an open container 2 and a damping liquid regulating mechanism 4; one end of the pendulum 1 is used to connect with the structure to be damped; the mass block 3 is arranged at the other end of the rigid pendulum 1; the open container 2 is arranged below the pendulum 1, and is used to contain damping liquid to provide damping for the mass block 3; the damping liquid regulating mechanism 4 comprises a damping liquid regulator 41 and a damping liquid container 42, the damping liquid container 42 is used to contain damping liquid, the damping liquid regulator 41 connects the damping liquid container 42 and the open container 2 through a pipeline, and is used to adjust the depth of the damping liquid in the open container 2.

[0038] When the adjustable frequency single pendulum tuned liquid mass damping device is used, one end of the pendulum 1 is connected to the structure to be damped, and the mass block 3 is arranged at the other end of the rigid pendulum 1; the open container 2 is arranged below the pendulum 1, and the mass block 3 is partially extended into the damping liquid contained in the open container 2. When the control frequency of the entire damping device needs to be adjusted, the depth of the damping liquid in the open container 2 is adjusted by the damping liquid adjustment mechanism 4. For example, if the control frequency of the entire damping device needs to be reduced, the damping liquid regulator 41 extracts the damping liquid from the damping liquid container 42 through the pipeline and adds it to the open container 2, so that the damping liquid level in the open container 2 increases. If it is necessary to increase the control frequency of the entire damping device, the damping liquid regulator 41 draws the damping liquid from the open container 2 into the damping liquid container 42 through a pipeline, or the damping liquid container 42 is set at a lower position relative to the open container 2, a discharge outlet is set at the lower part of the open container 2, and is connected to the damping liquid container 42 through a connecting pipeline, a valve is set on the connecting pipeline, and the damping liquid in the open container 2 is discharged into the damping liquid container 42 by opening the valve, so that the damping liquid level in the open container 2 is lowered.

[0039] In this example, the damping liquid regulator 41 includes a two-way pump connecting the damping liquid container 42 and the open container 2 through a pipeline; or an extraction pump connecting the damping liquid container 42 and the open container 2 through a pipeline, which is used to add the damping liquid in the damping liquid container 42 to the open container 2, and a discharge pump connecting the damping liquid container 42 and the open container 2 through a pipeline, which is used to discharge the damping liquid in the open container 2 to the open container 2 damping liquid container 42; or, an extraction pump connecting the damping liquid container 42 and the open container 2 through a pipeline, which is used to add the damping liquid in the damping liquid container 42 to the open container 2, the damping liquid container 42 is set at a lower position relative to the open container 2, and is connected to the damping liquid container 42 through a connecting pipeline, and a valve is set on the connecting pipeline.

[0040] In some optional embodiments, the mass block 3 has a containing space therein, and the device further includes a mass adjustment mechanism 5, which is in communication with the containing space and is used to add or discharge mass fluid into the containing space.

[0041] In this embodiment, by adding or discharging mass fluid into the accommodation space through the mass adjustment mechanism 5, the mass of the mass block 3 can be changed, thereby adjusting the control frequency of the entire damping device and improving the vibration reduction effect of the entire damping device. For example, during the construction of the cantilever beam, as the cantilever beam gradually extends, its mass also gradually increases. According to the mass ratio requirement, that is, the mass ratio of the mass of the damped structure to the mass block of the damping device must be within a set range to achieve a better vibration reduction effect. Therefore, the mass block of the damping device also needs to be increased. In this solution, by adding mass fluid into the accommodation space through the mass adjustment mechanism 5, the vibration reduction effect of the entire damping device can be improved; compared with the prior art, when the mass of the damped structure increases or decreases, it is more convenient to only increase or decrease the damping device, which can improve the overall construction efficiency.

[0042] In this example, the mass adjustment mechanism 5 includes a mass fluid regulator 51 and a mass fluid container 52. The mass fluid container 52 is used to hold the mass fluid. The mass fluid regulator 51 connects the mass fluid container 52 and the storage space through a pipeline, and is used to add or discharge the mass fluid into the storage space. The specific structural form of the mass adjustment mechanism 5 is basically the same as the structural form of the damping liquid adjustment mechanism 4. It can be in the form of a two-way pump, or in the form of a combination of an extraction pump and a discharge pump, which will not be described here one by one. The mass fluid can be added from the mass fluid container 52 to the storage space through a pipeline, and can be discharged from the storage space to the mass fluid container 52 through a pipeline. It can be a liquid or a small spherical solid, as long as it can achieve the above functions.

[0043] In some optional embodiments, the rocker arm 1 is a rigid rocker arm, a flow hole communicating with the accommodation space is provided in the rigid rocker arm, and the mass adjustment mechanism 5 is communicated with the accommodation space through the flow hole.

[0044] In this embodiment, the rocker arm 1 adopts a rigid rocker arm, and a flow hole connected to the accommodating space in the mass block 3 is arranged in the axial direction of the rigid rocker arm. One end of the flow hole extends into the bottom of the accommodating space in the mass block 3 or extends into the bottom of the accommodating space through a connecting pipe, and one end is connected to the mass adjustment mechanism 5. In this way, the amount of mass fluid in the accommodating space can be adjusted through the mass adjustment mechanism 5, and such a design will not be affected when the rocker arm 1 swings.

[0045] like Figure 4 and Figure 5 As shown, in some optional embodiments, a floating cover plate 31 is provided in the accommodating space, which is sleeved on the portion of the rigid rocker arm extending into the accommodating space, or is sleeved on a connecting pipe 33 that connects the flow hole and extends to the bottom of the accommodating space along the axial direction of the rigid rocker arm, and can move along the axial direction of the rigid rocker arm and float above the damping fluid.

[0046] In order to avoid the problem that the mass fluid in the accommodation space shakes when swinging with the mass block 3, thereby affecting the vibration reduction effect. In this solution, a floating cover plate 31 is sleeved on the rigid swing rod or the connecting tube 33, and a sliding sleeve 313 sleeved on the rigid swing rod or the connecting tube 33 is set in the middle of the floating cover plate 31, so that the floating cover plate 31 is sleeved on the rigid swing rod or the connecting tube 33 through the sliding sleeve 313, so that when the floating cover plate 31 moves axially along the rigid swing rod or the connecting tube 33, the floating cover plate 31 is always kept perpendicular to the axis of the rigid swing rod or the connecting tube 33. In addition, the floating cover plate 31 can float above the mass fluid, and rise and fall synchronously with the liquid level of the mass fluid. In this way, when swinging with the mass block 3, the mass fluid is covered by the floating cover plate 31, and the floating cover plate 31 can reduce the shaking of the mass fluid, thereby reducing the vibration reduction effect on the entire damping device.

[0047] like Figure 2 As shown, in some optional embodiments, the mass block 3 is in the shape of an inverted truncated cone, and the space for containing the damping fluid in the open container 2 is in the shape of a cylinder.

[0048] In this example, the mass block 3 is in the shape of an inverted truncated cone, that is, the diameter of the lower end of the mass block 3 is smaller than the diameter of the upper end, and the space for containing the damping fluid in the open container 2 is designed to be cylindrical. When swinging with the mass block 3, the inclined outer edge of the mass block 3 can adapt to the vertical inner wall of the open container 2, thereby reducing the diameter requirement for the open container 2. If the shape of the mass block 3 is set to be cylindrical, under the same maximum swing angle, the cylindrical mass block 3 requires an open container 2 with a larger diameter. In this example, in order to ensure the stroke of the mass block, the inclination angle of the outer wall of the mass block 3 is designed to be equal to the maximum swing angle, that is, at the maximum design swing angle, the outer wall of the mass block 3 is in a vertical state, which can effectively reduce the diameter of the damping barrel and reduce the amount of damping fluid.

[0049] like Figure 4 and Figure 5 As shown, in some optional embodiments, the accommodating space is in the shape of an inverted frustum, the floating cover plate 31 includes a horizontal cover plate 311 and a plurality of rotating cover plates 312, the horizontal cover plate 311 is sleeved on the rigid rocker or the connecting tube 33, and can move in the axial direction of the rigid rocker or the connecting tube 33 with the height of the mass fluid, and the plurality of rotating cover plates 312 are circumferentially arranged on the outer edge of the horizontal cover plate 311, one end of which is rotatably connected to the horizontal cover plate 311, and the other end of which is overlapped on the inner wall of the mass block 3.

[0050] In this embodiment, since the mass block 3 is in the shape of an inverted truncated cone, the accommodating space inside it is also in the shape of an inverted truncated cone, and the floating cover plate 31 needs to be designed to be able to adapt to the accommodating space in the shape of an inverted truncated cone. Even when the floating cover plate 31 moves axially in the accommodating space, it can form an effective constraint on the mass fluid in the accommodating space, thereby reducing the influence of the shaking of the mass fluid on the vibration reduction effect.

[0051] In this example, the floating cover plate 31 is designed to include a horizontal cover plate 311 and a plurality of rotating cover plates 312. The horizontal cover plate 311 is sleeved on the rigid rocker or the connecting tube 33 through a sleeve 313. The plurality of rotating cover plates 312 are circumferentially arranged on the outer edge of the horizontal cover plate 311. When the horizontal cover plate 311 moves with the liquid level of the mass fluid, the rotating cover plate 312 is always mounted on the inner wall of the mass block 3. When the liquid level of the mass fluid is low, the angle between the rotating cover plate 312 and the horizontal cover plate 311 is large. As the liquid level of the mass fluid rises, the angle between the rotating cover plate 312 and the horizontal cover plate 311 gradually decreases, but the rotating cover plate 312 is always mounted on the inner wall of the mass block 3. A slider is provided at one end where the rotating cover plate 312 overlaps the inner wall of the mass block 3, and a slide groove matching the slider is provided on the inner wall of the mass block 3, so as to keep the rotating cover plate 312 always overlapped on the inner wall of the mass block 3 and minimize the influence of the shaking of the mass fluid on the vibration reduction effect.

[0052] In some optional embodiments, the adjustable frequency single pendulum tuned liquid mass damping device also includes a vibration monitoring mechanism and a control unit. The vibration monitoring mechanism is used to monitor the vibration frequency of the structure to be damped, and the control unit is used to obtain the vibration frequency monitored by the vibration monitoring mechanism, and control the damping liquid adjusting mechanism 4 to adjust the damping liquid height in the open container 2 and / or control the mass adjusting mechanism 5 to add or discharge mass fluid into the accommodating space according to the vibration frequency.

[0053] In this embodiment, the control frequency of the entire damping device can be adjusted by controlling the height of the damping fluid in the open container 2 and the amount of the mass fluid in the accommodating space. Therefore, a monitoring mechanism is provided on the structure to be damped to monitor the vibration frequency of the structure to be damped, and the corresponding height of the damping fluid and the amount of the mass fluid in the accommodating space are calculated according to the vibration frequency of the structure to be damped, and the damping fluid adjustment mechanism 4 and / or the mass adjustment mechanism 5 can be adjusted accordingly.

[0054] For a conventional simple pendulum TMD, the motion equation of the mass block in the tangential direction is: The tangential velocity and acceleration of the mass block are In the small displacement state, sinθ≈θ, so the equation of motion is set up Substituting into: -mLω 2 θ+mgθ=0, then the frequency of the system is: Where θ is the swing angle of the pendulum, is the angular velocity, is the angular acceleration, L is the length of the pendulum, g is the acceleration of gravity, m is the mass of the mass block, θ0 is, e is a natural constant, and ω is the angular velocity of rotation.

[0055] There are two main forces when immersing a mass block in a liquid, buoyancy and hydrodynamic force (first-order hydrodynamic force (damping force), second-order hydrodynamic force (water added mass)), as follows Figure 3 shown.

[0056] Assume that the immersion depth is h = h0-L(1-cosθ), h0 is the liquid surface height, and the buoyancy F is b F b =ρgV 排 , V 排 is the displacement volume of the mass block, and the additional mass of water is δ m , then the equilibrium equation in the tangential direction is: The normal equilibrium equation is: F+ρgV 排 cosθ=mg cosθ, F is the axial tension of the pendulum; in the small displacement state, sinθ≈θ, cosθ≈1, and the motion equation is: The system control frequency is Where γ is the ratio of the mass buoyancy to gravity, λ is the ratio of the inertial mass of the liquid to the weight of the mass block,

[0057] With the target frequency of 0.19 Hz, if a conventional single pendulum TMD is used, the corresponding pendulum length is L0 = g / (2πf) 2 =6.88m; for TLMD, take Then L = 2.29m, which can effectively reduce the pendulum length and make the damper layout space more compact.

[0058] Based on the above analysis, in some optional embodiments, the control unit Determine the ratio of the mass block's buoyancy to gravity γ; according to Determine the displacement volume V of mass 3 排 ; According to the discharge volume V 排 , determine the height of the damping liquid in the open container 2, where f is the vibration frequency monitored by the vibration monitoring mechanism, l is the pendulum length, λ is the ratio of the inertial mass of the liquid to the weight of the mass block, γ is the ratio of the buoyancy of the mass block to the gravity, g is the gravitational acceleration, m is the mass of the mass block 3, and ρ is the density of the damping liquid.

[0059] In this example, by monitoring the vibration frequency of the structure to be damped, the control frequency of the entire damping device can be determined according to the vibration frequency, the ratio of the buoyancy of the mass block to the gravity can be determined according to the control frequency, the displacement volume of the mass block 3 can be determined according to the ratio of the buoyancy of the mass block to the gravity, and then the height of the damping liquid in the open container 2 can be determined based on the displacement volume of the mass block 3, and finally the height of the damping liquid in the open container 2 can be adjusted by the damping liquid adjustment mechanism 4.

[0060] In some optional embodiments, a flexible buffer material 32 is provided at the bottom of the mass block 3, and the flexible buffer material 32 is spaced apart from the bottom of the open container 2, and contacts the bottom of the open container 2 when the mass block 3 swings to a set angle with the pendulum 1.

[0061] In this embodiment, this solution adopts two buffering measures, namely, self-damping oil buffering and a circle of flexible buffer material 32 (damping rubber or polyurethane) wrapped around the bottom of the mass block.

[0062] First, the damping ratio of the damper has a nonlinear characteristic. The larger the amplitude, the larger the damping ratio of the damper, the better the vibration reduction effect, and the better the buffering effect for the large stroke of the mass block, which can provide a certain buffering effect for the mass block impacting the damping oil barrel of the damper.

[0063] Secondly, a circle of flexible buffer material 32 is wrapped around the bottom of the mass block, such as Figure 1 and Figure 4 As shown, the impact of the mass block on the damper oil barrel is reduced by the cushioning performance of the flexible cushioning material 32 .

[0064] When the device is used to reduce vibration of a wind turbine tower, a stiffening rib 21 is provided on the outside of the open container 2, and the stiffening rib 21 is fixedly connected to the supporting plate 72 below, so as to limit the position of the open container 2, so that when the mass block 3 swings, if the displacement is too large, it can only hit the open container 2, thereby preventing the mass block 3 from directly hitting the wind turbine tower and reducing the risk of impact.

[0065] The damping fluid of the technical solution can buffer and release a large amount of impact energy, and prevent rigid impact through the flexible buffer material 32, so as to ensure that the damper has a non-return limit function and does not interfere with or collide with other structures or components of the whole machine during reciprocating motion. The non-return function of the damper of the technical solution adopts a good flexible buffer material 32, which can ensure that the collision load is stable during the non-return limit and the damper stroke is controllable.

[0066] like Figure 1 As shown, in some optional embodiments, the rocker arm 1 includes a long rocker arm 12, a universal joint 13 and a plurality of short rocker arms 11, and flanges for connection are provided between the long rocker arm 12, the universal joint 13 and the short rocker arms 11.

[0067] In this embodiment, since the control frequency of the simple pendulum damper is related to the pendulum length, in this solution, the universal joint 13 and multiple short pendulum rods 11 are arranged above the long pendulum rod 12. By adjusting the position of the universal joint 13, the actual pendulum length of the simple pendulum can be adjusted, thereby adjusting the control frequency. For example, if two short pendulum rods 11 are used, and the connection sequence is: universal joint 13, short pendulum rod 11, short pendulum rod 11 and long pendulum rod 12, and two adjacent parts are connected by flange, the pendulum length is the sum of the lengths of the short pendulum rod 11, short pendulum rod 11 and long pendulum rod 12; if the connection sequence is: short pendulum rod 11, universal joint 13, short pendulum rod 11 and long pendulum rod 12, and two adjacent parts are connected by flange, the pendulum length is the sum of the lengths of the short pendulum rod 11 and long pendulum rod 12; if the connection sequence is: short pendulum rod 11, short pendulum rod 11, universal joint 13 and long pendulum rod 12, and two adjacent parts are connected by flange, the pendulum length is the length of the long pendulum rod 12. The control frequency can also be adjusted in this way.

[0068] When the rocker 1 of this solution is adopted, a flow hole connected to the accommodating space is arranged in the rigid rocker 12, and the lower end of the long rocker 12 extends into the bottom of the accommodating space in the mass block 3 or extends into the bottom of the accommodating space through a connecting pipe.

[0069] In addition, the present invention also provides a wind turbine, in which the adjustable frequency single pendulum tuned liquid mass damping device is installed. In order to install the adjustable frequency single pendulum tuned liquid mass damping device, a mounting plate 71 and a supporting plate 72 are arranged in intervals in the wind turbine tower 6. The mounting plate 71 is used to suspend the pendulum rod 1 and the mass adjustment mechanism 5, and the supporting plate 72 is used to install the open container 2 and the damping liquid adjustment mechanism 4. The mounting plate 71 and the supporting plate 72 provide installation and construction positions for the adjustable frequency single pendulum tuned liquid mass damping device.

[0070] Among them, the adjustable frequency single pendulum type tuning liquid mass damping device has the same function as the adjustable frequency single pendulum type tuning liquid mass damping device in the above embodiment, and will not be described in detail here.

[0071] In order to verify the feasibility of this solution, damping liquid of different depths was added into the open container 2, and the following test results were obtained:

[0072] The specific test conditions are: pendulum length 240cm, mass block 3 diameter 48cm, the bottom of mass block 3 is 5cm away from the bottom of open container 2, and damping fluid is damping oil. The relationship between the immersion depth of mass block 3 and the frequency and damping ratio is shown in the following table:

[0073]

[0074] From the above test, it can be seen that as the immersion depth increases, the swing frequency of the mass block 3 gradually decreases. After the height of the mass block 3 exceeds 30cm, the increase in immersion depth has no obvious effect on the change in damping ratio. The specific change trend diagram is shown in the figure below. Figure 6 and Figure 7 shown.

[0075] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0076] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0077] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. An adjustable frequency single pendulum tuned liquid mass damping device, characterized in that: include: A swing rod (1), one end of which is used to be connected to the structure to be damped; A mass block (3) disposed at the other end of the pendulum (1); an open container (2), which is arranged below the pendulum rod (1) and is used to contain damping fluid to provide damping for the mass block (3); The damping liquid regulating mechanism (4) comprises a damping liquid regulator (41) and a damping liquid container (42), wherein the damping liquid container (42) is used to contain the damping liquid, and the damping liquid regulator (41) is connected to the damping liquid container (42) and the open container (2) via a pipeline, and is used to regulate the depth of the damping liquid in the open container (2).

2. The adjustable frequency single pendulum tuned liquid mass damping device according to claim 1, characterized in that: The mass block (3) has a containing space therein, and the device further comprises a mass adjustment mechanism (5) which is in communication with the containing space and is used for adding or discharging mass fluid into or out of the containing space.

3. The adjustable frequency single pendulum tuned liquid mass damping device according to claim 2, characterized in that: The rocker (1) is a rigid rocker, a flow hole communicating with the accommodation space is provided in the rigid rocker, and the mass adjustment mechanism (5) is communicated with the accommodation space through the flow hole.

4. The adjustable frequency single pendulum tuned liquid mass damping device according to claim 3, characterized in that: A floating cover plate (31) is provided in the accommodation space and is sleeved on the portion of the rigid rocker extending into the bottom of the accommodation space, or sleeved on a connecting pipe (33) connected to the flow hole and extending to the bottom of the accommodation space along the axial direction of the rigid rocker, and can move along the axial direction of the rigid rocker and float above the damping fluid.

5. The adjustable frequency single pendulum tuned liquid mass damping device according to claim 4, characterized in that: The mass block (3) is in the shape of an inverted truncated cone, and the space for containing the damping liquid in the open container (2) is in the shape of a cylinder.

6. The adjustable frequency single pendulum tuned liquid mass damping device according to claim 5, characterized in that: The accommodating space is in the shape of an inverted truncated cone. The floating cover plate (31) comprises a horizontal cover plate (311) and a plurality of rotating cover plates (312). The horizontal cover plate (311) is sleeved on the rigid swing rod or the connecting tube (33) and can move in the axial direction of the rigid swing rod or the connecting tube (33) according to the height of the mass fluid. The plurality of rotating cover plates (312) are circumferentially arranged on the outer edge of the horizontal cover plate (311), one end of which is rotatably connected to the horizontal cover plate (311) and the other end of which is overlapped on the inner wall of the mass block (3).

7. The adjustable frequency single pendulum tuned liquid mass damping device according to claim 2, characterized in that: It also includes a vibration monitoring mechanism and a control unit, wherein the vibration monitoring mechanism is used to monitor the vibration frequency of the structure to be damped, and the control unit is used to obtain the vibration frequency monitored by the vibration monitoring mechanism, and control the damping fluid adjustment mechanism (4) to adjust the height of the damping fluid in the open container (2) and / or control the mass adjustment mechanism (5) to add or discharge mass fluid into the accommodating space according to the vibration frequency.

8. The adjustable frequency single pendulum tuned liquid mass damping device according to claim 7, characterized in that: The control unit is based on Determine the ratio of the mass buoyancy to gravity, γ; according to Determine the displacement volume Vdisplacement of the mass block (3); Determining the height of the damping liquid in the open container (2) according to the liquid displacement volume Vrow of the mass block 3; Where f is the vibration frequency monitored by the vibration monitoring mechanism, L is the pendulum length, λ is the ratio of the inertial mass of the liquid to the weight of the mass block, γ is the ratio of the buoyancy of the mass block to the gravity, g is the gravitational acceleration, m is the mass of the mass block (3), ρ is the density of the damping fluid, δ m is the inertial mass of the liquid.

9. The adjustable frequency single pendulum tuned liquid mass damping device according to claim 1, characterized in that: A flexible buffer material (32) is provided at the bottom of the mass block (3), and the flexible buffer material (32) is spaced apart from the bottom of the open container (2), and when the mass block (3) swings to a set angle along with the swing rod (1), the mass block (3) contacts the bottom of the open container (2).

10. The adjustable frequency single pendulum tuned liquid mass damping device according to claim 1, characterized in that: The swing rod (1) comprises a long swing rod (12), a universal hinge (13) and a plurality of short swing rods (11), and flanges for connection are provided between the long swing rod (12), the universal hinge (13) and the short swing rods (11).

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