A tuned liquid mass damper that can self-replenish evaporated water

Abstract

The present invention relates to the field of vibration reduction technology, and provides a tuned liquid mass damper that can replenish evaporated water by itself, comprising a first liquid container, an elastic element, and a second liquid container; one end of the elastic element is connected to the first liquid container, and the other end of the elastic element is used to connect to a controlled structure; the first liquid container can drive the elastic element to expand and contract when it moves vertically relative to the controlled structure; a movable baffle is provided in the second liquid container, and the first liquid container can drive the movable baffle to reduce the volume of the second liquid container when it rises relative to the controlled structure, thereby causing the liquid in the second liquid container to overflow into the first liquid container. The present invention solves the problem that existing tuned liquid dampers can only be used to control vibrations in the horizontal direction but not in the vertical direction, and that the liquid level needs to be monitored and the liquid needs to be replenished regularly, resulting in high operation and maintenance costs.

Description

Technical Field

[0001] The invention relates to the field of vibration reduction technology, in particular to a tuning liquid mass damper capable of replenishing evaporated water by itself. Background Art

[0002] Civil structures such as bridges and houses vibrate under various external loads. Controlling the vibration of the structure is an important measure to ensure structural safety. Reducing the vibration of the structure can be done by adding some energy-absorbing devices to the structure, such as dampers, to reduce the dynamic response of the structure under external loads, thereby ensuring the safety of the structure.

[0003] A tuned liquid damper (TLD) is a device for passive structural control, consisting of a first liquid container fixed to the structure. Its vibration reduction mechanism is as follows: when the structure vibrates under the action of external loads, the water in the container sloshes. The force generated by the sloshing water and the water pressure generated by the waves on the wall of the first liquid container constitute the TLD's control force on the structure. At the same time, the viscosity of water can also dissipate part of the structural vibration energy, thereby reducing the structure's horizontal vibration response.

[0004] However, current TLDs can often only be used to control vibrations in the horizontal direction and cannot be used to control vibrations in the vertical direction. The vibration direction of the structure under various dynamic loads is random. Therefore, for most structures, other forms of dampers are required to control the vertical vibration of the structure, which will lead to the complexity of the vibration reduction structure and increased construction costs. In addition, during the actual service process of existing TLDs, due to various factors, such as high temperature environment, the liquid inside it will evaporate and dissipate, causing the liquid level to drop and cause frequency imbalance, which in turn leads to a significant decrease in the vibration reduction effect. The liquid level of the TLD needs to be monitored and the liquid needs to be replenished manually on a regular basis, which results in high operation and maintenance costs. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem that the existing tuned liquid damper can only be used to control vibrations in the horizontal direction but not in the vertical direction, and requires monitoring the liquid level and regular replenishment of liquid, resulting in high operation and maintenance costs. A tuned liquid mass damper that can replenish evaporated water by itself is provided.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A tuned liquid mass damper capable of self-replenishing evaporated water comprises a first liquid container for containing liquid; an elastic element and a second liquid container; one end of the elastic element is connected to the first liquid container, and the other end of the elastic element is connected to a controlled structure; the first liquid container has vertical freedom of movement relative to the controlled structure, and vertical movement of the first liquid container relative to the controlled structure can drive the elastic element to expand and contract;

[0008] The second liquid container is used to hold liquid and replenish the first liquid container with liquid; a movable baffle is provided in the second liquid container, and the position and / or angle of the movable baffle relative to the second liquid container is adjustable; the movable baffle is connected to the first liquid container through a transmission mechanism, and the first liquid container rises relative to the controlled structure to drive the movable baffle to move and / or rotate, thereby reducing the volume of the second liquid container, and then causing the liquid in the second liquid container to overflow into the first liquid container.

[0009] The specific design of the first liquid container refers to the existing tuned liquid damper and can be in the form of a water tank or a water tank, for example, as long as it can play the role of a tuned liquid damper after the liquid is added; the vertical movement freedom of the first liquid container relative to the controlled structure can be achieved in various ways, such as installing a slide rail with a vertical length or installing an elastic element with a vertical stroke.

[0010] Elastic elements include but are not limited to springs and rubber blocks; the specific arrangement of the elastic elements, such as the position, number and axis angle, can be various, for example, a single elastic element with a vertical axis is arranged at the bottom of the first liquid container, or inclined elastic elements are arranged around the first liquid container, as long as the first liquid container can absorb vertical impact and vibration.

[0011] The movable baffle can be arranged relative to the second liquid container in various forms, for example, the movable baffle can be translated relative to the second liquid container with reference to a piston structure, as long as the movement of the movable baffle can cause the volume of the second liquid container to decrease.

[0012] The transmission mechanism between the movable baffle and the first liquid container can be in various forms, such as a connecting rod mechanism, a gear rack mechanism, as long as the rise of the first liquid container can drive the movable baffle to move in the direction of reducing the volume of the second liquid container.

[0013] The second liquid container can be arranged relative to the first liquid container in various forms, such as simply placing the second liquid container below the first liquid container, or connecting the second liquid container to the first liquid container through a pipeline, as long as the liquid overflowing from the second liquid container can enter the first liquid container.

[0014] A tuned liquid mass damper capable of self-replenishing evaporated water comprises a first liquid container. Once filled with liquid, the container functions as a tuned liquid damper, thereby controlling horizontal vibrations of a controlled structure. Furthermore, the first liquid container and the liquid therein can be used as a vertically movable mass, forming a tuned mass damper together with an elastic element, thereby also controlling vertical vibrations of the controlled structure. This eliminates the need for additional dampers required for controlling vertical vibrations, as is the case with conventional tuned liquid dampers. This achieves multi-functionality and reduces the complexity and construction costs of the vibration damping structure.

[0015] The present solution further comprises a second container having a movable baffle, which is connected to the first liquid container via a transmission mechanism. When the liquid in the first liquid container decreases, the total mass of the first liquid container and the liquid therein decreases. In order to rebalance the total gravity of the first liquid container and the liquid therein with the elastic force of the elastic element, the position of the first liquid container rises relative to the controlled structure, thereby driving the movable baffle to reduce the volume of the second liquid container and cause the liquid in the second liquid container to overflow into the first liquid container. That is, the present solution realizes the function of automatically replenishing liquid after the liquid in the first liquid container decreases, and has good maintenance-free performance.

[0016] At the same time, the transmission ratio of the transmission mechanism can be adjusted according to actual conditions, such as the evaporation rate of the liquid, the stiffness of the elastic element, the mass and volume of the first liquid container, the volume and shape of the second liquid container, etc., and the volume reduction of the second liquid container can be matched with the volume reduction of the liquid in the first liquid container, thereby keeping the liquid volume in the first liquid container unchanged at the optimal design value, thereby avoiding frequency imbalance due to changes in liquid volume and a significant decrease in vibration reduction effect, so that the present solution can always maintain the best working state.

[0017] As a preferred solution of the present invention, the movable baffle is swingably connected to the second liquid container, and the swing of the movable baffle relative to the second liquid container can change the volume of the second liquid container.

[0018] As a preferred embodiment of the present invention, the second liquid container is a rectangular box; the movable baffle is hinged to one side or edge of the second liquid container, and the side of the second liquid container opposite to the movable baffle has an angle θ with the movable baffle, 0°≤θ≤21.47°.

[0019] The movable baffle is hinged to one side of the second liquid container, for example, hinged to one vertical surface or bottom surface of the second container; the movable baffle is hinged to one edge of the second liquid container, for example, hinged to one of the four vertical edges of the second container.

[0020] As a preferred solution of the present invention, the transmission mechanism includes a rope; one end of the rope is connected to the first liquid container, and the other end of the rope is connected to the movable baffle.

[0021] As a preferred solution of the present invention, the transmission mechanism includes a rope; one end of the rope is connected to the first liquid container, and the other end of the rope is connected to the movable baffle.

[0022] The rope can be in various forms, including but not limited to steel rope and nylon rope.

[0023] As a preferred embodiment of the present invention, it further comprises a water source, and the water source is used to replenish liquid in the second liquid container.

[0024] The water source can be in various forms such as normally open, time switch or manual switch.

[0025] As a preferred embodiment of the present invention, the water source is a dripping faucet; the dripping speed of the dripping faucet matches the evaporation speed of the liquid in the first liquid container.

[0026] This solution uses a dripping faucet as a water source, and sets the dripping speed of the dripping faucet to match the evaporation speed of the liquid in the first liquid container. There is no need to manually switch the water source on and off, and no need for a timer or other sensors, such as a flow meter. It has the advantages of being maintenance-free and having low manufacturing costs.

[0027] As a preferred solution of the present invention, it further comprises a linear limit assembly; the linear limit assembly is used to limit the freedom of movement of the first liquid container relative to the controlled structure in the horizontal direction.

[0028] The linear limit assembly includes but is not limited to a pulley slide rail mechanism and a slide groove slide rail mechanism.

[0029] This solution uses a linear limit assembly to limit the horizontal movement freedom of the first liquid container, which can prevent the first liquid container from shaking in the horizontal direction, thereby affecting the vibration reduction effect or even causing overturning, and has higher reliability and safety.

[0030] As a preferred solution of the present invention, the linear limiting assembly includes a guide wheel group; the guide wheel group is connected to the outside of the first liquid container.

[0031] As a preferred solution of the present invention, the elastic element includes a coil spring.

[0032] The number of the coil springs may be one or more.

[0033] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0034] 1. A tuned liquid mass damper capable of self-replenishing evaporated water in this solution comprises a first liquid container. Once filled with liquid, the container functions as a tuned liquid damper, thereby controlling the horizontal vibration of a controlled structure. Furthermore, the first liquid container and the liquid therein can also function as a vertically movable mass block, forming a tuned mass damper together with an elastic element, thereby also controlling the vertical vibration of the controlled structure. This eliminates the need for other dampers to control vertical vibration, as is required with conventional tuned liquid dampers. This achieves multi-purpose functionality and reduces the complexity and construction cost of the vibration-damping structure.

[0035] This solution also includes a second liquid container with a movable baffle, and a transmission mechanism is used to connect the movable baffle to the first liquid container, so that the liquid in the first liquid container can be automatically replenished after the liquid is reduced, and has good maintenance-free performance.

[0036] At the same time, by reasonably adjusting the transmission ratio of the transmission mechanism, the volume reduction of the second liquid container can be matched with the volume reduction of the liquid in the first liquid container, thereby keeping the liquid volume in the first liquid container unchanged at the optimal design value, thereby avoiding frequency imbalance caused by changes in liquid volume and a significant decrease in vibration reduction effect, so that this solution can always maintain the best working state. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the main structure of a tuned liquid mass damper capable of self-replenishing evaporated water in Example 1;

[0038] Figure 2 This is a partial enlarged schematic diagram of a tuned liquid mass damper capable of self-replenishing evaporated water at the second liquid container in Example 1;

[0039] Figure 3 This is a schematic diagram of the geometric relationship of a tuned liquid mass damper capable of replenishing evaporated water in Example 1 at the second liquid container. Figure 1 ;

[0040] Figure 4 This is a schematic diagram of the geometric relationship of a tuned liquid mass damper capable of replenishing evaporated water in Example 1 at the second liquid container. Figure 2 ;

[0041] Figure 5 This is a schematic diagram of the main structure of a tuned liquid mass damper capable of self-replenishing evaporated water in Example 2;

[0042] Figure 6 It is a schematic diagram of the main structure of an existing tuned liquid damper;

[0043] Icons: 1-first liquid container; 2-elastic element; 3-second liquid container; 4-movable baffle; 5-transmission mechanism; 6-water source; 7-guide wheel group; 51-rope; 52-fixed pulley. DETAILED DESCRIPTION

[0044] The present invention will be described in detail below with reference to the accompanying drawings.

[0045] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0046] Example 1

[0047] like Figures 1 to 4 As shown, the present embodiment adopts a tuned liquid mass damper capable of self-replenishing evaporated water, comprising a first liquid container 1 for containing liquid; and is characterized in that it further comprises an elastic element 2; one end of the elastic element 2 is connected to the first liquid container 1, and the other end of the elastic element 2 is used to connect to the controlled structure; the first liquid container 1 has a vertical degree of freedom of movement relative to the controlled structure, and the vertical movement of the first liquid container 1 relative to the controlled structure can drive the elastic element 2 to expand and contract.

[0048] Figure 6 This is a schematic diagram of the main structure of an existing tuned liquid damper. It can be seen that its first liquid container 1 is directly and fixedly connected to the controlled structure, and cannot move vertically relative to the controlled structure through the expansion and contraction of the elastic element 2 like the first liquid container 1 of this solution. Therefore, it can only be used to control the horizontal vibration of the controlled structure. The first liquid container 1 of this embodiment and the liquid therein can form a mass tuned damper together with the elastic element 2, thereby also being able to control the vertical vibration of the controlled structure.

[0049] Furthermore, the tuned liquid mass damper capable of replenishing evaporated water by itself in this embodiment further comprises a linear limit assembly, which is used to limit the horizontal freedom of movement of the first liquid container 1. Specifically, Figure 1 As shown, the first liquid container 1 of this embodiment is a rectangular box, and adding liquid into the rectangular box can serve as a tuned liquid damper; the linear limit assembly includes a guide wheel group 7, and the guide wheel group 7 is fixed to the outer wall of the first liquid container 1. The guide wheels of the guide wheel group 7 can roll on the side wall corresponding to the controlled structure or on the limiting structure.

[0050] like Figure 1As shown, the elastic element 2 includes a coil spring; the elastic element 2 of this embodiment is specifically connected to the bottom of the first liquid container 1, the number is greater than one and all are coil springs, and the axis of the coil spring is along the vertical direction; each elastic element 2 is centrally symmetrical or axially symmetrically distributed relative to the center of the first liquid container 1.

[0051] A second liquid container 3 for containing liquid is also provided above the first liquid container 1, so that after the liquid in the second liquid container 3 overflows, it can drip directly into the first liquid container 1; a movable baffle 4 is provided in the second liquid container 3, and the position and / or angle of the movable baffle 4 relative to the second liquid container 3 are adjustable; the movable baffle 4 is connected to the first liquid container 1 through a transmission mechanism 5, and the movement of the first liquid container 1 relative to the controlled structure can drive the movable baffle 4 to move and / or rotate, thereby changing the volume of the second liquid container 3, and then causing the liquid in the second liquid container 3 to overflow into the first liquid container 1.

[0052] Specifically, if Figures 2 to 4 As shown, the second liquid container 3 of this embodiment is a box body with an opening at the left end and the top, and the movable baffle 4 is hinged at the opening at the left end so that it can swing relative to the second liquid container 3; the rotating shaft of the movable baffle 4 is located at the lower end, the axis of the rotating shaft is in the horizontal direction, and the movable baffle 4 has an angle θ with the inner wall on the right side of the second liquid container 3, θ>0°, so that the second liquid container 3 and the movable baffle 4 together constitute a container with a right-angled trapezoidal cross-section; when the movable baffle 4 rotates in the clockwise direction, the volume of the second liquid container 3 decreases, and when the movable baffle 4 rotates in the counterclockwise direction, the volume of the second liquid container 3 increases.

[0053] For this embodiment, at the initial equilibrium position, let the compression amount of the elastic element 2 be x0, let the stiffness of the elastic element 2 be k, let the initial total mass of the first liquid container 1 and the liquid therein be m0, and let the acceleration due to gravity be g, then the following formula is obtained:

[0054] m0*g=k*x0

[0055] When the liquid in the first liquid container 1 gradually evaporates, assuming that the total mass of the first liquid container 1 and the liquid therein is reduced to m1, the compression amount of the elastic element 2 at this time is x1, then the following formula is obtained:

[0056] m1*g=k*x1

[0057] Since m1<m0, it can be obtained that x1<x0, that is, the compression amount of the elastic element 2 decreases, and the first liquid container 1 will rise relative to the controlled structure.

[0058] like Figure 3As shown, for the second liquid container 3 of this embodiment, if θ = 0°, the cross section of the second liquid container 3 is a square; if the side length of the square is a, the cross section area S of the second liquid container 3 is a 2 When θ increases slowly, the cross-sectional area of ​​the second liquid container 3 will increase to S′, and:

[0059] S′=0.5*(a+a+asinθ)*acosθ=a 2 *(cosθ+0.5sinθcosθ)

[0060] Then the change in area ΔS is:

[0061] ΔS=S′-S=a 2 *(cosθ+0.5sinθcosθ)-a 2

[0062] =a 2 *(cosθ+0.5sinθcosθ-1)

[0063] Let ΔS be differentiated with respect to θ to obtain:

[0064] ΔS′=a 2 *(-sinθ+0.5cos 2θ)

[0065] From ΔS′=0, it can be calculated that θ=21.47°.

[0066] Let ΔS′ be differentiated with respect to θ to obtain:

[0067] ΔS″=a 2 *(-cosθ-sin 2θ)

[0068] From the above formula, we can see that when θ is an acute angle, ΔS″ is always less than 0, so ΔS′ decreases when θ is an acute angle; when 0<θ<21.47°, ΔS′>0, that is, ΔS increases monotonically at 0<θ<21.47°; and when θ=0°, ΔS=a 2 *(cosθ+0.5sinθcosθ-1)=0, so we can conclude that when 0<θ<21.47°, ΔS>0. Conversely, when θ is slightly less than 21.47°, the cross-sectional area of ​​the second liquid container 3 gradually decreases as θ decreases. Therefore, the water in the second liquid container 3 will gradually overflow into the first liquid container 1 below as θ decreases. Therefore, this embodiment recommends that 0°≤θ≤21.47°.

[0069] like Figure 1 and Figure 2As shown, the transmission mechanism 5 includes a rope 51 and a fixed pulley 52; one end of the rope 51 is connected to the bottom of the first liquid container 1, and the other end of the rope 51 is connected to the top of the movable baffle 4; the fixed pulley 52 is used to support the rope 51 and help the rope 51 to turn, so that the rope 51 can be rewound from the bottom of the first liquid container 1 to the top of the movable baffle 4; a rim can be provided on the fixed pulley 52 to prevent the rope 51 from falling off.

[0070] like Figure 2 As shown, a water source 6 is further provided above the second liquid container 3, and the water source 6 is used to replenish liquid into the second liquid container 3. Specifically, the water source 6 in this embodiment is a dripping faucet that can continuously drip water into the second liquid container 3; the dripping speed matches the evaporation speed of the liquid in the first liquid container 1.

[0071] Example 2

[0072] like Figure 5 As shown, based on Example 1, the connection mode of the movable baffle 4 and the second liquid container 3 is changed to that the movable baffle 4 and the second liquid container 3 are connected in a sliding manner, and the sliding direction is along Figure 5 Left and right direction in .

[0073] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A tuned liquid mass damper capable of replenishing evaporated water by itself, comprising a first liquid container (1), wherein the first liquid container (1) is used to contain liquid; characterized in that: The device further comprises an elastic element (2) and a second liquid container (3); one end of the elastic element (2) is connected to the first liquid container (1), and the other end of the elastic element (2) is used to be connected to a controlled structure; the first liquid container (1) has a vertical degree of freedom of movement relative to the controlled structure, and the vertical movement of the first liquid container (1) relative to the controlled structure can drive the elastic element (2) to expand and contract; The second liquid container (3) is used to contain liquid and replenish the first liquid container (1) with liquid; a movable baffle (4) is provided in the second liquid container (3), and the position and / or angle of the movable baffle (4) relative to the second liquid container (3) are adjustable; the movable baffle (4) is connected to the first liquid container (1) through a transmission mechanism (5); the first liquid container (1) rises relative to the controlled structure to drive the movable baffle (4) to move and / or rotate, thereby reducing the volume of the second liquid container (3), thereby causing the liquid in the second liquid container (3) to overflow into the first liquid container (1).

2. A tuned liquid mass damper capable of self-replenishing evaporated water according to claim 1, characterized in that: The movable baffle (4) is swingably connected to the second liquid container (3); the movable baffle (4) swings relative to the second liquid container (3) to change the volume of the second liquid container (3).

3. A tuned liquid mass damper capable of self-replenishing evaporated water according to claim 2, characterized in that: The second liquid container (3) is a rectangular box; the movable baffle (4) is hinged to one side or edge of the second liquid container (3); a side of the second liquid container (3) opposite to the movable baffle (4) has an angle θ with the movable baffle (4), 0°≤θ≤21.47°.

4. A tuned liquid mass damper capable of self-replenishing evaporated water according to claim 1, characterized in that: The transmission mechanism (5) comprises a rope (51); one end of the rope (51) is connected to the first liquid container (1), and the other end of the rope (51) is connected to the movable baffle (4).

5. A tuned liquid mass damper capable of self-replenishing evaporated water according to claim 4, characterized in that: The transmission mechanism (5) further comprises a fixed pulley (52); the fixed pulley (52) is used to support the rope (51).

6. A tuned liquid mass damper capable of self-replenishing evaporated water according to any one of claims 1 to 5, characterized in that: It also comprises a water source (6), and the water source (6) is used to replenish liquid into the second liquid container (3).

7. A tuned liquid mass damper capable of self-replenishing evaporated water according to claim 6, characterized in that: The water source (6) is a dripping faucet; the dripping speed of the dripping faucet matches the evaporation speed of the liquid in the first liquid container (1).

8. A tuned liquid mass damper capable of self-replenishing evaporated water according to any one of claims 1 to 5, characterized in that: It also comprises a linear limiting component; the linear limiting component is used to limit the freedom of movement of the first liquid container (1) relative to the controlled structure in the horizontal direction.

9. A tuned liquid mass damper capable of self-replenishing evaporated water according to claim 8, characterized in that: The linear limiting assembly comprises a guide wheel set (7); the guide wheel set (7) is connected to the outside of the first liquid container (1).

10. A tuned liquid mass damper capable of self-replenishing evaporated water according to any one of claims 1 to 5, characterized in that: The elastic element (2) comprises a coil spring.

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