Level-stabilizing water replenishment system for tuned liquid damper

Abstract

The present application discloses a liquid level stable water replenishing system for a tuned liquid damper. The vibration damping water tank is fixedly installed on the top of a building. The first overflow pipe is installed on the upper side of the vibration damping water tank. The vibration damping partition net is fixedly installed between two opposite side surfaces inside the vibration damping water tank. The water level control water tank system includes a water level control water tank, a water supply pipe, a second overflow pipe, a water supply control device, and a sloshing partition net device. The second overflow pipe is installed on the upper side of the water level control water tank. The water supply control device is fixedly installed on the upper side of the water level control water tank, with one end in contact with the water level inside the water level control water tank and the other end connected to the water supply pipe. The sloshing partition net device is fixedly installed between two opposite side surfaces inside the water level control water tank. The lower part of the vibration damping water tank is communicated with the water level control water tank through a connecting pipe. The liquid level stable water replenishing system for the tuned liquid damper provided by the present application reduces the complexity of the system, improves the stability of system operation, reduces the system maintenance requirements, and fully guarantees the water depth in the water tank.

Description

Technical Field

[0001] This application relates to the technical field of tuned liquid dampers, and specifically relates to a water replenishing system for stabilizing the liquid level of a tuned liquid damper. Background Art

[0002] Fire fighting water tanks are usually required to be installed on the tops of high-rise buildings. Under the action of wind loads, high-rise buildings are in a vibrating state all year round, and their maximum vibration is located at the top of the structure. Through reasonable design, the fire fighting water tank can be set to a reasonable size, and measures such as reserving the liquid sloshing space in the water tank and increasing the damping can be taken, so that the natural vibration frequency of the water tank is the same as the natural vibration frequency of the main structure, that is, the rooftop fire fighting water tank is simultaneously transformed into a tuned liquid damper (TLD). When the top of the structure is in a sloshing state, the water tank on the rooftop is in the opposite sloshing state. At the same time, due to the installation of a device for increasing the damping of liquid sloshing, the sloshing energy of the liquid in the water tank can be quickly absorbed by the sloshing of the water tank, thereby achieving the purpose of reducing the structural sloshing. This system is the tuned liquid damper (TLD) system.

[0003] In the design of the tuned liquid damper system, the depth of the liquid in the water tank will affect the sloshing frequency of the liquid, thereby affecting the vibration reduction efficiency of the system. The nth-order sloshing frequency of the liquid in the water tank can be approximately calculated by the following formula:

[0004]

[0005]

[0006] Among them, H is the height of the still liquid level, and a is half of the length of the water tank in the sloshing direction. According to the formula, when the length of the water tank is constant, the sloshing frequency of the water tank is approximately proportional to the square root of the water depth. When there is a deviation between the actual water depth and the designed water depth during use, there will be a deviation between the sloshing frequency of the tuned liquid damper and the preset sloshing frequency. After the sloshing frequency of the tuned liquid damper deviates from the sloshing frequency of the main structure, the vibration reduction efficiency of the tuned liquid damper will decrease, and even a negative vibration reduction effect will occur.

[0007] Existing fire fighting water tanks, as Figure 1 shown, usually consist of an inlet pipe, an outlet pipe, an overflow pipe, a liquid level height judging device, and an inlet control valve. The usual liquid level height judging device uses a floating ball or a pressure valve. When the water level is lower than the preset target water level, water replenishment is carried out until the target water level is reached. When the water level is too high and exceeds the overflow pipe control water level, the liquid in the water tank flows out from the overflow pipe.

[0008] And for the vibration reduction water tank of the tuned liquid damper installed on a high-rise building, as Figure 2As shown. Due to the reservation of a large liquid sloshing space and the effect of frequency modulation resonance, the liquid in the water tank is in a sloshing state all year round in the normal use of the building. Whenever the sloshing trough is at the water level judgment position, the water tank will be replenished with water, causing the water level to exceed the target design water level. Therefore, the water inlet control device commonly used in fire water tanks cannot usually be used in tuned liquid dampers. Instead, a BAS (building equipment automation) system is required. The BAS system needs to comprehensively judge whether water can be added to the water tank and when to stop replenishing after comprehensively considering the roof vibration amplitude, water level sloshing and current water level. When the BAS system determines that the current water level depth is insufficient and water replenishment is required, it is necessary to further judge the water level sloshing wave height of the liquid and the current floor vibration acceleration to determine that the current liquid is not in a sloshing state and it is unlikely that a large liquid surface sloshing will occur in the future before water replenishment can be carried out. The entire water replenishment system requires a computer analysis logic judgment unit.

[0009] Due to the characteristics of the tuned liquid damper, the liquid in the water tank is usually in a state of shaking, and in order to improve the control effect, it is necessary to ensure that the liquid in the water tank reaches the target water level. This results in the introduction of complex water level monitoring systems, acceleration systems, and control systems into the existing control systems of tuned liquid dampers. This system is used to determine the current state of shaking of the liquid in the water tank and the state of shaking that the liquid will be in. Only when it is determined that the shaking amplitude of the liquid in the water tank is not large and the water tank is also in a state of insufficient water can water be added. This leads to some defects such as:

[0010] 1) Water can only be replenished in a static state. When the water shortage occurs in windy weather and the structure is shaking violently, water cannot be replenished, which limits the stability of the system;

[0011] 2) The data for identifying whether water can be replenished comes from water level monitoring and acceleration monitoring electrical signals at multiple locations, and the control system is required to make logical judgments. The system is an active control system, and the entire system needs to maintain power stability, accurate data collection, and stable judgment system, which places high demands on system maintenance;

[0012] 3) The system determines that water should be replenished under small disturbances, but due to the constant shaking of the building, the system always has small vibration disturbances, which will cause the liquid to be over-replenished, thus affecting the efficiency of the system. Summary of the invention

[0013] To this end, the present application provides a tuned liquid damper liquid level stabilization water replenishment system to solve the problems of poor stability, complex structure and low efficiency of the tuned liquid damper system in the prior art.

[0014] In order to achieve the above objectives, this application provides the following technical solutions:

[0015] A liquid level stable water replenishing system for a tuned liquid damper, comprising a vibration damping water tank system, a connecting pipe, and at least one water level control water tank system;

[0016] The vibration damping water tank system includes a vibration damping water tank, a first overflow pipe, and a vibration damping mesh. The vibration damping water tank is fixedly installed on the top of a building. The first overflow pipe is installed on the upper side of the vibration damping water tank. The vibration damping mesh is fixedly installed between two opposite inner sides of the vibration damping water tank;

[0017] The water level control water tank system includes a water level control water tank, a water supply pipe, a second overflow pipe, a water supply control device, and an anti-sway mesh device. The second overflow pipe is installed on the upper side of the water level control water tank. The water supply control device is fixedly installed on the upper side of the water level control water tank, with one end in contact with the water level inside the water level control water tank and the other end connected to the water supply pipe. The anti-sway mesh device is fixedly installed between two opposite inner sides of the water level control water tank;

[0018] The lower part of the vibration damping water tank is communicated with the water level control water tank through the connecting pipe.

[0019] Preferably, the water supply control device is a control ball valve.

[0020] Preferably, the vibration damping water tank system further includes at least one liquid level monitoring device, and the liquid level monitoring device is installed in the vibration damping water tank.

[0021] Preferably, the liquid level monitoring device includes a water level acquisition terminal, a water level acquisition instrument, and a recording unit. The water level acquisition terminal is installed in the vibration damping water tank and electrically connected to the water level acquisition instrument, and the water level acquisition instrument is also electrically connected to the recording unit.

[0022] Preferably, the vibration damping water tank system further includes an acceleration monitoring device, and the acceleration monitoring device is installed on the outer surface of the vibration damping water tank.

[0023] Preferably, the acceleration monitoring device includes a housing, an acceleration acquisition terminal, an acceleration acquisition instrument, and a recording unit. The acceleration acquisition terminal, the acceleration acquisition instrument, and the recording unit are integrated in the housing. The housing is installed on the outer surface of the vibration damping water tank, and both the acceleration acquisition terminal and the recording unit are electrically connected to the acceleration acquisition instrument.

[0024] Preferably, the vibration damping water tank and the water level control water tank are made of stainless steel, concrete, or steel.

[0025] Preferably, multiple water level control water tank systems are connected in series or in parallel with the vibration damping water tank system through the connecting pipe.

[0026] Compared with the prior art, the present application has at least the following beneficial effects:

[0027] The present application provides a liquid level stable water replenishing system for a tuned liquid damper, which includes a vibration damping water tank system, a connecting pipe, and at least one water level control water tank system; the vibration damping water tank system includes a vibration damping water tank, a first overflow pipe, and a vibration damping partition net. The vibration damping water tank is fixedly installed on the top of a building. The first overflow pipe is installed on the upper side of the vibration damping water tank. The vibration damping partition net is fixedly installed between two opposite inner sides of the vibration damping water tank; the water level control water tank system includes a water level control water tank, a water supply pipe, a second overflow pipe, a water supply control device, and an anti-sloshing partition net device. The second overflow pipe is installed on the upper side of the water level control water tank. The water supply control device is fixedly installed on the upper side of the water level control water tank, with one end in contact with the water level in the water level control water tank and the other end connected to the water supply pipe. The anti-sloshing partition net device is fixedly installed between two opposite inner sides of the water level control water tank; the lower part of the vibration damping water tank is communicated with the water level control water tank through the connecting pipe. The liquid level stable water replenishing system for a tuned liquid damper provided by the present application reduces the complexity of the system, improves the stability of system operation, reduces the maintenance requirements of the system, and fully ensures that the water depth in the vibration damping water tank is at a stable designed water depth, thereby ensuring the working efficiency of the tuned liquid damper. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] To more intuitively illustrate the prior art and the present application, several exemplary drawings are given below. It should be understood that the specific shapes and structures shown in the drawings generally should not be regarded as limiting conditions when implementing the present application; for example, those skilled in the art are capable of making routine adjustments or further optimizations to the addition / removal / attribution division of certain units (components), specific shapes, positional relationships, connection methods, dimensional proportional relationships, etc. based on the technical concept disclosed in the present application and the exemplary drawings.

[0029] Figure 1 It is a schematic structural diagram of an existing fire water tank;

[0030] Figure 2 It is a schematic structural diagram of an existing vibration damping water tank of a tuned liquid damper;

[0031] Figure 3 It is a schematic structural diagram of a liquid level stable water replenishing system for a tuned liquid damper provided by the present application;

[0032] Figure 4 It is a schematic installation structure diagram of the vibration damping partition net provided by the present application;

[0033] Figure 5 It is a schematic structural diagram of the vibration damping partition net provided by the present application;

[0034] Figure 6 It is a schematic structural diagram of the water level control water tank connected in series with the vibration damping water tank provided by the present application;

[0035] Figure 7 Schematic diagram of the structure where the water level control water tank provided in this application is connected in parallel to the vibration damping water tank;

[0036] Figure 8 Schematic diagram of the liquid level sloshing in the water tank for conventional water replenishment;

[0037] Figure 9 Time history of the water depth change in the water tank during small - amplitude sloshing for conventional water replenishment;

[0038] Figure 10 Actual water depth in the water tank under conventional water replenishment measures;

[0039] Figure 11 Flowchart of the stability control method for the liquid level stable water replenishment system of a tuned liquid damper provided in this application;

[0040] Figure 12 Schematic diagram of the vibration acceleration of the floor;

[0041] Figure 13 Liquid flow velocity in the connecting pipe;

[0042] Figure 14 Liquid water depth in the vibration damping water tank.

[0043] Explanation of the reference numerals:

[0044] 1. Vibration damping water tank system; 101. Vibration damping water tank; 102. First overflow pipe; 103. Liquid level monitoring device; 104. Acceleration monitoring device; 105. Target water level; 106. Actual water level; 107. Vibration damping partition net; 2. Connecting pipe; 3. Water level control water tank system; 301. Water level control water tank; 302. Second overflow pipe; 303. Water supply control device; 304. Water supply pipe; 305. Anti - sloshing partition net device. Detailed implementation manners

[0045] The following further details this application through specific embodiments in conjunction with the accompanying drawings.

[0046] In the description of this application: Unless otherwise specified, "a plurality of" means two or more. The terms "first", "second", "third", etc. in this application are intended to distinguish the objects being referred to, and do not have a special meaning in terms of technical connotation (for example, it should not be understood as emphasizing the importance level or order, etc.). Expressions such as "including", "comprising", "having", etc. also mean "not limited to" (certain units, components, materials, steps, etc.).

[0047] Terms such as "upper", "lower", "left", "right", "middle", etc. cited in this application are usually for the convenience of intuitive understanding with reference to the attached drawings, rather than an absolute limitation on the positional relationship in the actual product. Without departing from the technical concept disclosed in this application, changes in these relative positional relationships shall also be regarded as within the scope of the expression of this application.

[0048] Please refer to Figure 3 , this application provides a liquid level stable water replenishing system for a tuned liquid damper, which includes a vibration damping water tank system 1, a connecting pipe 2, and at least one water level control water tank system 3.

[0049] The vibration damping water tank system 1 includes a vibration damping water tank 101, a first overflow pipe 102, and a vibration damping partition net 107. Among them, the vibration damping water tank 101 can be made of stainless steel, concrete, steel, etc.; the vibration damping water tank 101 is fixedly installed on the top of the building, and the size and water depth in the water tank of the vibration damping water tank 101 should be designed so that the liquid sloshing frequency is consistent with the main vibration frequency of the target building; the first overflow pipe 102 is installed on the upper side of the vibration damping water tank 101, and when the actual water level 106 exceeds the height of the first overflow pipe 102, the water body flows out from the first overflow pipe 102; when the air pressure in the vibration damping water tank 101 is too high, the gas can also flow out from it; as Figure 4 shown, the vibration damping partition net 107 is fixedly installed between two opposite sides inside the vibration damping water tank 101, as Figure 5 shown, the vibration damping partition net 107 can have different forms.

[0050] The water level control water tank system 3 includes a water level control water tank 301, a water supply pipe 304, a second overflow pipe 302, a water supply control device 303, and a sloshing reduction mesh device 305. Among them, the water level control water tank 301 can be made of stainless steel, concrete, steel, etc. The size of the water level control water tank 301 and the water depth inside the water level control water tank 301 should be designed. The sloshing frequency of the water level control water tank 301 is far from the sloshing frequency of the target building. The second overflow pipe 302 is installed on the upper side of the water level control water tank 301, and its position and diameter are reasonably designed. When the water level in the water level control water tank 301 is too high, the excessive water can flow out from the second overflow pipe 302. The water supply control device 303 is fixedly installed on the upper side of the water level control water tank 301, one end is in contact with the water level inside the water level control water tank 301, and the other end is connected to the water supply pipe 304. The water supply control device 303 is an ordinary water depth control ball valve, and the control ball valve is a floating ball valve that can set the target water replenishment depth. When the water depth in the water level control water tank 301 drops below the target water level 105, the control ball valve is in the open state, and water flows into the water level control water tank 301 from the water supply pipe 304. When the water depth rises above the target water level 105, the control ball valve closes and the water supply stops. The sloshing reduction mesh device 305 is fixedly installed between two opposite inner sides of the water level control water tank 301. When the structure shakes, the liquid in the water level control water tank 301 does not resonate and slosh. The sloshing reduction mesh device 305 can adopt different hole opening forms and quantities, aiming to increase the sloshing damping of the liquid in the water level control water tank 301, so that the liquid in the water level control water tank 301 is basically in a non-sloshing state.

[0051] The lower part of the vibration reduction water tank 101 is communicated with the water level control water tank 301 through a connecting pipe 2.

[0052] The vibration reduction water tank system 1 further includes at least one liquid level monitoring device 103. The liquid level monitoring device 103 includes a water level acquisition terminal, a water level acquisition instrument, and a recording unit. The water level acquisition terminal is installed in the vibration reduction water tank 101 and is electrically connected to the water level acquisition instrument. The water level acquisition instrument is also electrically connected to the recording unit, and can measure the liquid height in the water tank and record it.

[0053] The vibration reduction water tank system 1 further includes an acceleration monitoring device 104. The acceleration monitoring device 104 includes a housing, an acceleration acquisition terminal, an acceleration acquisition instrument, and a recording unit. The acceleration acquisition terminal, the acceleration acquisition instrument, and the recording unit are integrated in the housing. The housing is installed on the outer surface of the vibration reduction water tank 101. Both the acceleration acquisition terminal and the recording unit are electrically connected to the acceleration acquisition instrument.

[0054] The acceleration monitoring device 104 and the liquid level monitoring device 103 are independent operating systems, and the records are used for regular system debugging and maintenance.

[0055] Please refer to Figure 6 and Figure 7, for the tuned liquid damper liquid level stable water replenishment system provided by this application, in order to improve the stability and water replenishment efficiency of the system, two or more water level control tank systems 3 can be used. The multiple water level control tank systems 3 and the vibration damping tank system 1 can be in series, parallel, or a combination of series and parallel through the connecting pipe 2.

[0056] The working principle of the tuned liquid damper liquid level stable water replenishment system provided by this application is as follows:

[0057] The vibration damping tank 101 is connected to the water level control tank 301 through the connecting pipe 2. When the water level in the vibration damping tank 101 is low, water flows from the water level control tank 301 into the vibration damping tank 101 through the connecting pipe 2; when the water level in the vibration damping tank 101 is high, water flows from the vibration damping tank 101 to the water level control tank 301. When the water level in the water level control tank 301 is insufficient, the control ball valve controls the water supply pipe 304 to replenish water into it.

[0058] Specifically, the water level in the vibration damping tank 101 is in a shaking state all year round, that is, the water pressure near the connecting pipe 2 will change with the shaking of the water body. As a result, during the shaking process, the water in the vibration damping tank 101 and the water level control tank 301 flows back and forth through the connecting pipe 2. To avoid 1) the water level in the water level control tank 301 drops too much due to the shaking of the water body in the vibration damping tank 101, resulting in excessive water replenishment of the water supply pipe 304; 2) the water level in the water level control tank 301 shakes, the size ratio of the vibration damping tank 101 and the water level control tank 301, the diameter of the connecting pipe 2, the position of the connecting pipe 2, the water level control line of the control ball valve, the diameter of the water supply pipe 304, the diameter and height of the overflow pipe, etc. should be reasonably designed according to the vibration acceleration amplitude and vibration frequency of the building roof.

[0059] This application reasonably designs the size ratio of the vibration damping tank 101 and the water level control tank 301, the diameter of the connecting pipe 2, the position of the connecting pipe 2, the water level control line of the control ball valve, the diameter of the water supply pipe 304, the diameter and height of the two overflow pipes, etc. according to the dynamic characteristics of the tuned liquid damper, and realizes the design of the passive water level stable water replenishment system for the tuned liquid damper. The whole set of system does not require a complex acceleration monitoring system, liquid level control system and judgment control system, and realizes the passive water level stable water replenishment of the water tank liquid level during the shaking process without external power supply. The system has high stability, is easy to debug, and has low maintenance requirements, can significantly reduce the system installation cost and maintenance cost of the tuned liquid damper, and greatly reduces the use threshold of the tuned liquid damper. By setting up this system, the effect of using the original high-rise building fire water tank system for vibration reduction under wind load can be achieved, and it has good application prospects for the vibration exceeding standard renovation of new buildings and existing buildings.

[0060] To more clearly introduce the advantages of the liquid level stable water replenishment system for the tuned liquid damper provided by this application, the following will make specific explanations in combination with the problems of conventional water replenishment:

[0061] For the liquid level distribution during small-amplitude shaking of a conventional tuned liquid damper, refer to Figure 8 , and for the time history of the water depth change at a certain point, refer to Figure 9 . It can be seen from Figure 9 that when the water depth is lower than the standard water depth 1 due to the shaking of the water tank, the water replenishment switch will be triggered, and finally the water depth in the water tank will be at a depth higher than the target design water depth. Refer to Figure 10 .

[0062] For the stable control method of the liquid level stable water replenishment system for the tuned liquid damper provided by this application, refer to Figure 11 . Specifically:

[0063] Calculate the shaking amplitude of the vibration damping water tank 101 and the water level control water tank 301 according to the floor vibration;

[0064] The shaking amplitude includes the velocity potential function of the water tank during the vibration process, the height of the shaking liquid level, and the water pressure of the liquid in the shaking water tank. Among them,

[0065] The velocity potential function of the water tank during the vibration process is:

[0066]

[0067] The height of the shaking liquid level is:

[0068]

[0069] The water pressure of the liquid in the shaking water tank is:

[0070]

[0071] Among them,

[0072]

[0073] Calculate the liquid flow velocity in the connecting pipe according to Bernoulli's equation:

[0074]

[0075] Assume the pipe diameter is D, then the water depth increment of the shaking water tank during the shaking process is:

[0076]

[0077] According to the above formulas and Figure 11 it can be known that when the vibration acceleration of the floor is as shown in Figure 12 , the liquid surface flow velocity in the connecting pipe 2 is as shown in Figure 13As shown, after being controlled by the liquid level stable water replenishing system of the tuned liquid damper provided by the present application, the water depth change in the vibration damping water tank 101 is as follows Figure 14 shown by Figure 14 It can be seen that the water depth deviation in the vibration damping water tank 101 is reduced from about 10% of the original water depth deviation during the water replenishment due to the shaking of the ordinary vibration damping water tank to less than 1% (a smaller water depth deviation can be obtained by adopting a smaller connecting pipe).

[0078] The technical features of the above embodiments can be combined arbitrarily (as long as there is no contradiction in the combination of these technical features). For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described; these embodiments not explicitly written out should also be considered as within the scope described in this specification.

[0079] In the above text, the present application has been described in a relatively specific and detailed manner through general descriptions and specific embodiments. It should be understood that based on the technical concept of the present application, several conventional adjustments or further innovations can be made to these specific embodiments; but as long as they do not depart from the technical concept of the present application, the technical solutions obtained by these conventional adjustments or further innovations also fall within the protection scope of the claims of the present application.

Claims

1. A liquid level stable water replenishing system for a tuned liquid damper, characterized in that, it includes a vibration damping water tank system, a connecting pipe and at least one water level control water tank system; The vibration damping water tank system includes a vibration damping water tank, a first overflow pipe and a vibration damping partition net. The vibration damping water tank is fixedly installed on the top of the building. The first overflow pipe is installed on the upper side of the vibration damping water tank. The vibration damping partition net is fixedly installed between two opposite inner sides of the vibration damping water tank; The water level control water tank system includes a water level control water tank, a water supply pipe, a second overflow pipe, a water supply control device and an anti-sway partition net device. The second overflow pipe is installed on the upper side of the water level control water tank. The water supply control device is fixedly installed on the upper side of the water level control water tank, with one end in contact with the water level in the water level control water tank and the other end connected to the water supply pipe. The anti-sway partition net device is fixedly installed between two opposite inner sides of the water level control water tank; The water supply control device is a control ball valve; The lower part of the vibration damping water tank is communicated with the water level control water tank through the connecting pipe; The vibration damping water tank system further includes an acceleration monitoring device, and the acceleration monitoring device is installed on the outer surface of the vibration damping water tank.

2. The liquid level stable water replenishing system for a tuned liquid damper according to claim 1, characterized in that, the vibration damping water tank system further includes at least one liquid level monitoring device, and the liquid level monitoring device is installed in the vibration damping water tank.

3. The liquid level stable water replenishing system for a tuned liquid damper according to claim 2, characterized in that, the liquid level monitoring device includes a water level acquisition terminal, a water level acquisition instrument and a recording unit. The water level acquisition terminal is installed in the vibration damping water tank and is electrically connected to the water level acquisition instrument. The water level acquisition instrument is also electrically connected to the recording unit.

4. The liquid level stable water replenishing system for a tuned liquid damper according to claim 1, characterized in that, the acceleration monitoring device includes a housing, an acceleration acquisition terminal, an acceleration acquisition instrument and a recording unit. The acceleration acquisition terminal, the acceleration acquisition instrument and the recording unit are integrated in the housing. The housing is installed on the outer surface of the vibration damping water tank. The acceleration acquisition terminal and the recording unit are both electrically connected to the acceleration acquisition instrument.

5. The liquid level stable water replenishing system for a tuned liquid damper according to claim 1, characterized in that, the vibration damping water tank and the water level control water tank are made of stainless steel, concrete or steel.

6. The liquid level stable water replenishing system for a tuned liquid damper according to claim 1, characterized in that, a plurality of the water level control water tank systems are connected in series or in parallel with the vibration damping water tank system through the connecting pipe.

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