A frequency-adjustable pendulum type tuning liquid mass damper

Abstract

The present application relates to the technical field of vibration reduction, in particular to a frequency-adjustable single-pendulum tuned liquid mass damper device, which comprises a pendulum rod, a mass block, an open container and a damping liquid adjusting mechanism; one end of the pendulum rod is used for connecting with a structure to be damped; the mass block is arranged at the other end of the rigid pendulum rod; the open container is arranged below the pendulum rod and is used for containing damping liquid to provide damping for the mass block; the damping liquid adjusting mechanism comprises a damping liquid adjusting device and a damping liquid container; the damping liquid container is used for containing damping liquid; the damping liquid adjusting device is connected with the damping liquid container and the open container through a pipeline and is used for adjusting the depth of the damping liquid in the open container. The device can solve the problem that the existing single-pendulum tuned liquid mass damper cannot adapt to the control requirements of frequency changes, resulting in the problem that the device cannot effectively reduce vibration in specific cases.

Description

Technical Field

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

[0002] Single pendulum TMD frequency control Where g is the acceleration due to gravity and l is the pendulum length. It can be seen that when the control frequency of a simple pendulum TMD is as low as 0.1 Hz, the pendulum length reaches 24.82 m, seriously affecting the stability and installation space of the TMD structure. Furthermore, both TMD structures require dedicated dampers to dissipate energy.

[0003] The lateral vibration frequency of a building is affected not only by wind speed but also by wind direction. Wind forces act on buildings in different ways and at different points at different wind directions, resulting in varying vibration characteristics. For example, a building's lateral vibration may be more pronounced in a crosswind direction (e.g., at a 90-degree wind angle) than in a downwind direction (e.g., at a 0-degree wind angle).

[0004] During the hoisting of large equipment, the length of the hoisting rope becomes shorter and shorter as the hoisting progresses, 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 being unable to effectively reduce vibration under certain circumstances. Summary of the Invention

[0006] In response to 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 a frequency-adjustable single pendulum tuned liquid mass damping device, comprising:

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

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

[0011] an open container, disposed below the pendulum rod and 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. The damping liquid container is used to contain the damping liquid. The damping liquid regulator is connected to the damping liquid container and the open container through a pipeline and is used to regulate the depth of the damping liquid in the open container.

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

[0014] In some optional solutions, 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 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, and can move along the axial direction of the rigid rocker and float above the damping fluid.

[0016] In some optional solutions, 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. 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, a vibration monitoring mechanism and a control unit are also included, wherein the vibration monitoring mechanism is used to monitor the vibration frequency of the structure to be attenuated, and the control unit is used to obtain the vibration frequency monitored by the vibration monitoring mechanism, and control the damping fluid adjustment mechanism to adjust the damping fluid height in the open container and / or control the mass adjustment 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 γ of the mass's buoyancy to its gravity;

[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 liquid inertial mass to the mass block weight, γ is the ratio of the mass block buoyancy to gravity, g is the gravitational acceleration, m is the mass of the mass block, ρ is the density of the damping fluid, 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 contacts the bottom of the open container when the mass block swings to a set angle with the rocker arm.

[0024] In some optional solutions, the rocker arm includes a long rocker arm, a universal joint and a plurality of short rocker arms, and flanges for connection are provided between each of the long rocker arm, the universal joint and the short rocker arms.

[0025] Compared with the prior art, the advantages of the present invention are as follows: when the control frequency of the entire damping device needs to be adjusted, the damping liquid depth in the open container is adjusted by the damping liquid regulating mechanism. If the control frequency of the entire damping device needs to be lowered, the damping liquid regulator draws damping liquid from the damping liquid container through a pipeline and adds it to the open container, thereby raising the damping liquid level in the open container. If the control frequency of the entire damping device needs to be increased, the damping liquid regulator draws damping liquid from the open container through a pipeline into the damping liquid container, thereby lowering the damping liquid level in the open container. This solution can adaptively adjust 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 following briefly introduces the drawings required for use in the description of the embodiments. 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 any creative work.

[0027] Figure 1 Schematic diagram of the structure 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 acting on the mass block in an embodiment of the present invention;

[0030] Figure 4 Schematic diagram of the structure of the mass block in an embodiment of the present invention;

[0031] Figure 5 Schematic diagram of the structure of the 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 adjustment mechanism; 41. damping fluid regulator; 42. damping fluid container; 5. mass adjustment mechanism; 51. mass fluid regulator; 52. mass fluid container; 6. wind turbine tower; 71. mounting plate; 72. support plate. DETAILED DESCRIPTION

[0035] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts 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 be connected to 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 hold damping liquid to provide damping for the mass block 3; the damping liquid regulating mechanism 4 includes a damping liquid regulator 41 and a damping liquid container 42, the damping liquid container 42 is used to hold damping liquid, and the damping liquid regulator 41 is connected to 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 using this adjustable-frequency single-pendulum tuned liquid mass damping device, one end of a pendulum rod 1 is connected to the structure to be damped, and a mass 3 is placed at the other end of the rigid pendulum rod 1. An open container 2 is positioned below the pendulum rod 1, with the mass 3 partially extending into the damping fluid contained in the open container 2. When the control frequency of the entire damping device needs to be adjusted, the damping fluid depth within the open container 2 is adjusted via a damping fluid adjustment mechanism 4. For example, to lower the control frequency of the entire damping device, a damping fluid regulator 41 draws damping fluid from a damping fluid container 42 through a pipeline and adds it to the open container 2, raising the damping fluid level within the open container 2. 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, and 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 bidirectional 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, and the damping liquid container 42 is set at a low 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 an accommodating space therein, and the device further includes a mass adjustment mechanism 5 , which is in communication with the accommodating space and is used to add or discharge mass fluid into or out of the accommodating space.

[0041] In this embodiment, by adding or removing 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 a 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 structure to be damped to the mass block of the damping device must be within a set range to achieve a good 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 structure to be damped increases or decreases, the only way to increase or decrease the damping device is more convenient, 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 mass fluid. The mass fluid regulator 51 connects the mass fluid container 52 and the storage space via a pipeline and is used to add or discharge mass fluid into the storage space. The specific structural form of the mass adjustment mechanism 5 is basically the same as that of the damping fluid adjustment mechanism 4. It can be in the form of a bidirectional pump or in the form of a combination of an extraction pump and a discharge pump. The details will not be described here. The mass fluid can be added from the mass fluid container 52 to the storage space through a pipeline and discharged from the storage space into 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 set 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 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, and can move along the axial direction of the rigid rocker and float above the damping fluid.

[0046] To prevent the mass fluid in the accommodation space from swaying as it swings with the mass block 3, thereby affecting the vibration damping effect, this solution employs a floating cover plate 31 mounted on the rigid rocker or connecting tube 33. A sliding sleeve 313, which is mounted on the rigid rocker or connecting tube 33, is positioned in the middle of the floating cover plate 31. The sliding sleeve 313 allows the floating cover plate 31 to be mounted on the rigid rocker or connecting tube 33. This ensures that the floating cover plate 31 remains perpendicular to the axis of the rigid rocker or connecting tube 33 as it moves axially along the rigid rocker or connecting tube 33. Furthermore, the floating cover plate 31 floats above the mass fluid, rising and falling synchronously with the mass fluid level. As the mass fluid swings with the mass block 3, it is covered by the floating cover plate 31, which reduces swaying of the mass fluid and, therefore, the vibration damping effect of 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, mass block 3 is designed to be an inverted frustum, meaning the diameter of its lower end is smaller than that of its upper end. Furthermore, the space within open container 2, which holds the damping fluid, is designed to be cylindrical. When mass block 3 swings with it, the inclined outer edge of mass block 3 adapts to the vertical inner wall of open container 2, thereby reducing the required diameter of open container 2. If mass block 3 were designed to be cylindrical, a cylindrical mass block 3 would require a larger diameter open container 2 at the same maximum swing angle. In this example, to ensure the mass block's travel, the inclination angle of mass block 3's outer wall is designed to be equal to the maximum swing angle. That is, at the maximum designed swing angle, the outer wall of mass block 3 is vertical, effectively reducing the diameter of the damping barrel and minimizing the amount of damping fluid used.

[0049] like Figure 4 and Figure 5 As shown, in some optional embodiments, the accommodating space is in the shape of an inverted frustum, and 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. 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 frustum, the accommodation space inside it is also in the shape of an inverted frustum. Therefore, the floating cover plate 31 needs to be designed to be able to adapt to the inverted frustum. Even when the floating cover plate 31 moves axially in the accommodation space, it can effectively constrain the mass fluid in the accommodation space, thereby reducing the impact of the swaying 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 multiple rotating cover plates 312. The horizontal cover plate 311 is mounted on a rigid rocker or connecting tube 33 via a sliding sleeve 313. Multiple rotating cover plates 312 are circumferentially arranged around the outer edge of the horizontal cover plate 311. As the horizontal cover plate 311 moves with the level of the mass fluid, the rotating cover plates 312 remain attached to the inner wall of the mass block 3. When the mass fluid level is low, the angle between the rotating cover plates 312 and the horizontal cover plate 311 is large. As the mass fluid level rises, the angle between the rotating cover plates 312 and the horizontal cover plate 311 gradually decreases, while maintaining the rotating cover plates 312 attached to the inner wall of the mass block 3. A slider is provided at one end where the rotating cover plate 312 overlaps with the inner wall of the mass block 3, and a sliding groove cooperating with the slider is provided on the inner wall of the mass block 3, so as to keep the rotating cover plate 312 always overlapped with 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 further 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 adjustment mechanism 4 to adjust the damping liquid height 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.

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

[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, then 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 (additional mass of water)), as follows Figure 3 shown.

[0056] Assume that the immersion depth is h = h0-L(1-cosθ), h0 is the liquid level, 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 buoyancy to the gravity of the mass block, λ is the ratio of the inertial mass of the liquid to the weight of the mass block,

[0057] At the target frequency of 0.19 Hz, if a conventional simple 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 is configured to Determine the ratio of mass 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 liquid inertial mass to the mass block weight, γ is the ratio of the mass block buoyancy to gravity, g is the acceleration due to gravity, 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 and gravity of the mass block can be determined according to the control frequency, and the displacement volume of the mass block 3 can be determined according to the ratio of the buoyancy and gravity of the mass block. 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 on the large stroke of the mass block, which can provide a certain buffering effect for the mass block hitting 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 using this device to reduce vibration of the wind turbine tower, stiffening ribs 21 are set on the outside of the open container 2, and the stiffening ribs 21 are fixedly connected to the supporting plate 72 below to limit the open container 2. When the mass block 3 swings, if the displacement is too large, it can only hit the open container 2, which can prevent the mass block 3 from directly hitting the wind turbine tower and reduce the risk of impact.

[0065] The damping fluid in this technical solution can buffer and release a large amount of impact energy. The flexible cushioning material 32 prevents rigid impact, ensuring that the damper has a non-return limit function and prevents interference or collision with other structures or components of the entire machine during reciprocating motion. The non-return function of the damper in this technical solution uses a highly flexible cushioning material 32, ensuring stable collision load during non-return limit and controllable damper travel.

[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 links 11 are connected in the following order: universal joint 13, short pendulum link 11, short pendulum link 11, and long pendulum link 12, and the two adjacent components are connected by flanges, the pendulum length is the sum of the lengths of the short pendulum link 11, the short pendulum link 11, and the long pendulum link 12; if the connection order is: short pendulum link 11, universal joint 13, short pendulum link 11, and long pendulum link 12, and the two adjacent components are connected by flanges, the pendulum length is the sum of the lengths of the short pendulum link 11 and the long pendulum link 12; if the connection order is: short pendulum link 11, short pendulum link 11, universal joint 13, and long pendulum link 12, and the two adjacent components are connected by flanges, the pendulum length is the length of the long pendulum link 12. The control frequency can also be adjusted in this way.

[0068] When the rocker arm 1 of this solution is adopted, a flow hole connected to the accommodating space is provided in the rigid rocker arm and is arranged in the long rocker arm 12. The lower end of the long rocker arm 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] The present invention also provides a wind turbine having the adjustable-frequency single-pendulum tuned liquid mass damping device installed therein. To install the adjustable-frequency single-pendulum tuned liquid mass damping device, a mounting plate 71 and a support plate 72 are spaced apart within 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 support plate 72 is used to mount the open container 2 and the damping liquid adjustment mechanism 4. The mounting plate 71 and the support plate 72 provide a location for the installation and construction of 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 fluid 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 3 diameter 48cm, the bottom of mass 3 5cm from the bottom of open container 2, and damping oil. The relationship between the immersion depth of mass 3, frequency, and damping ratio is shown in the following table:

[0073]

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

[0075] In the description of this application, it should be noted that the terms "upper" and "lower" and the like 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 this application and simplifying the description, and do not indicate or imply 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 this 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 an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this 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 used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any 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 comprising 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, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0077] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. An adjustable frequency single pendulum tuned liquid mass damping device, characterized in that: include: A rocker (1), one end of which is used to connect to the structure to be damped; A mass block (3) is provided at the other end of the pendulum rod (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); A 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 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); the mass block (3) has a accommodating space, and the device further comprises a mass regulating mechanism (5) which is in communication with the accommodating space and is used to add or discharge mass fluid into or out of the accommodating space; the rocker (1) adopts a rigid rocker, and a flow hole in communication with the accommodating space is provided in the rigid rocker, and the mass regulating mechanism (5) is in communication with the accommodating space via the flow hole; a floating cover plate (31) is provided in the accommodating space, which is sleeved on the portion of the rigid rocker extending into the bottom of the accommodating space, or sleeved on the portion of the rigid rocker extending into the bottom of the accommodating space. The floating cover plate (31) is arranged on a connecting pipe (33) connected to the flow hole and extending to the bottom of the accommodating space along the axial direction of the rigid pendulum, and can move along the axial direction of the rigid pendulum and float above the damping fluid; 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 cylindrical; the accommodating space is in the shape of an inverted truncated cone, 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 pendulum or the connecting pipe (33), and can move in the axial direction of the rigid pendulum or the connecting pipe (33) according to 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).

2. The frequency-adjustable single pendulum tuned liquid mass damping device according to claim 1, 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.

3. The frequency-adjustable single pendulum tuned liquid mass damping device according to claim 2, characterized in that: The control unit is based on , determine the ratio of the mass buoyancy to gravity ; according to , determine the displacement volume of mass (3) ; According to the displacement volume of mass block (3) , determining the height of the damping liquid in the open container (2); in, The vibration frequency monitored by the vibration monitoring mechanism, L is the pendulum length, λ is the ratio of the liquid inertial mass to the mass block weight, γ is the ratio of the buoyancy of the mass block to the gravity, g is the acceleration due to gravity, m is the mass of the mass block (3), is the density of the damping fluid, is the inertial mass of the liquid.

4. The frequency-adjustable 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). When the mass block (3) swings to a set angle along with the swing rod (1), the flexible buffer material (32) contacts the bottom of the open container (2).

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

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