CN210105016U - Pumped storage power station factory building structure vibration control device - Google Patents
Pumped storage power station factory building structure vibration control device Download PDFInfo
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- CN210105016U CN210105016U CN201920015008.3U CN201920015008U CN210105016U CN 210105016 U CN210105016 U CN 210105016U CN 201920015008 U CN201920015008 U CN 201920015008U CN 210105016 U CN210105016 U CN 210105016U
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- 229910000639 Spring steel Inorganic materials 0.000 claims abstract description 43
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 30
- 239000010959 steel Substances 0.000 claims abstract description 30
- 238000003466 welding Methods 0.000 claims description 2
- 230000004044 response Effects 0.000 abstract description 24
- 238000013016 damping Methods 0.000 abstract description 13
- 230000005284 excitation Effects 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 7
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- 238000004146 energy storage Methods 0.000 description 1
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- 239000002184 metal Substances 0.000 description 1
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- 238000005086 pumping Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
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Abstract
A vibration control device for a pumped storage power station plant structure belongs to the field of civil engineering and relates to a vibration reduction control technology. The vibration control device for the pumped storage factory building comprises a tuned mass damper device which is suitable for vibration control of the pumped storage factory building. The device comprises two counterweight steel plates, a fixing clamp, a spring steel plate and two connecting plates, wherein one end of the spring steel plate is connected with the counterweight steel plate through a bolt, and the other end of the spring steel plate is connected with the fixing clamp through a bolt. The working frequency of the mass damper is adjusted by adjusting the position and the weight of the counterweight steel plate, so that the counterweight steel plate is simple and reliable and is not limited by structural space. The control of the tuned mass damper device in two directions is achieved by connecting the fixing clamp with the clamp side plate. Based on the vibration characteristics of pumped storage power station factory building, the utility model provides an adopt modal parameter recognition means analysis damping front and back structural response, can judge the damping effect of harmonious mass damper under the high frequency excitation.
Description
Technical Field
The utility model relates to a pumped storage power station factory building structure vibration control device, it belongs to civil engineering vibration control field.
Background
Vibration is a not inconsiderable problem for civil engineering structures, and is an important index reflecting the state of the art of the operation of structures. The vibration problem is particularly serious for a pumped storage power station factory building structure provided with a large-scale generating set. With the increase of the scale of the factory building structure and the increase of the unit capacity, the instances of the vibration problem occurring in the unit operation period are increased more and more. The unit vibrates excessively and can cause the unusual vibration of factory building structure, is in the vibration state for a long time and causes the fatigue failure of structure easily, will lead to the structure to appear the crack seriously and influence structure safety. In addition, the vibration is not only related to the normal use of a factory building structure and the safe and stable operation of precision equipment, but also related to the physical and mental health of daily workers. Therefore, it is imperative to solve the vibration problem of the plant structure.
The main reason of the vibration of the plant structure is often caused by the high-frequency vibration of the unit, and the high-frequency vibration caused by the unit and the high-order vibration mode of the plant structure generate frequency aliasing, so that the vibration response of the structure is further amplified. Therefore, it is necessary to introduce a vibration control technique to suppress the abnormal vibration of the structure, thereby ensuring the safety of the structure and the stable operation of the equipment. For vibration control at a particular frequency, it is appropriate to apply tuned mass dampers. Most of existing tuned mass dampers adopt spiral springs as stiffness units, the existing produced spiral springs cannot meet the stiffness requirement for restraining high-order vibration mode vibration of a factory building structure, the number of the springs is multiplied, on one hand, cost performance is low, the springs are not economical, and the size of the tuned mass damper is increased by a large number of spring elements, so that the requirement of the device on space is greatly improved, and the limitation on normal production and life is caused. On the other hand, tuning devices with a plurality of springs are difficult to work coordinately under high-frequency vibration, ideal tuning effects are difficult to achieve, and the tuning devices have high requirements on production processes but low reliability.
The utility model discloses to above problem, the proposition adopts the spring steel board to carry out damping control as attenuator rigidity component to the structure, has overcome in the past harmonious mass damper spring rate not enough and multiunit spring high-frequency vibration down be difficult to the limitation of coordinating, through the position of adjustment counter weight steel board and the operating frequency of the harmonious mass damper of quantity to install it in the factory building structure in order to restrain high-frequency vibration and ensure structural safety. The device is simple and reliable, is not limited by structural space, greatly improves the construction efficiency and saves the cost.
Disclosure of Invention
The utility model aims at providing a pumped storage power station factory building structure vibration control device is connected the rigidity component and the counter weight steel sheet of spring steel board as harmonious mass damper and installs on the factory building structure, realizes harmonious factory building structure high order type vibration frequency to reach the purpose that restraines the local high-frequency vibration of pumped storage power station factory building structure.
The utility model provides a technical scheme that its technical problem adopted is: a vibration control device for a pumped storage power station factory building structure comprises a fixing clamp, a spring steel plate, a counterweight steel plate and a connecting plate, wherein one end of the spring steel plate is provided with two long screw holes, and the other end of the spring steel plate is provided with a bolt hole; the counterweight steel plate is provided with a first bolt hole, the fixing clamp adopts a U-shaped structure, an opening of the U-shaped structure is fixedly connected with a clamp side plate, two connecting grooves fixedly connected with a connecting plate are arranged on each outer side surface of the fixing clamp and the clamp side plate, and a second bolt hole is arranged on the connecting plate; one end of the spring steel plate is inserted between the two connecting plates and fixed by a second bolt, and two sides of the other end of the spring steel plate are respectively provided with a counterweight steel plate and then fixed by a first bolt; when spring steel plates are connected to three side faces of the fixing clamp and clamp side plates, the high-frequency vibration control device based on the tuned mass damper is formed and controls two directions.
The first bolt penetrates through a first bolt hole in the counterweight steel plate and an elongated screw hole in the spring steel plate. And the second bolt penetrates through a second bolt hole in the connecting plate and a bolt hole in the spring steel plate. The connecting plate is fixed in the connecting groove by adopting a welding structure. The clamp side plate is fixed at the opening of the U-shaped structure of the fixed clamp through a third bolt.
The utility model has the advantages that: the vibration control device for the pumped storage power station plant structure comprises a tuned mass damper. The device comprises two counterweight steel plates, a fixing clamp, a spring steel plate and two connecting plates, wherein one end of the spring steel plate is connected with the counterweight steel plate through a bolt, the other end of the spring steel plate is connected with the fixing clamp through a bolt, the limitation that the traditional tuned mass damper is insufficient in spring stiffness and difficult to coordinate under high-frequency vibration of a plurality of groups of springs is overcome, the working frequency of the mass damper is adjusted by adjusting the position of the counterweight steel plate, and the mass damper is installed on a factory building structure to restrain high-frequency vibration and ensure the structural safety. The device is simple and reliable, is not limited by structural space, greatly improves the construction efficiency and saves the cost. The control of the tuned mass damper device in two directions is achieved by connecting the fixing clamp with the clamp side plate. Based on the vibration characteristics of pumped storage power station plants, the frequency of a unit vibration source is far higher than the fundamental frequency of plant structures, but the unit vibration source and the high-order vibration modes of the plant structures have frequency aliasing, so that local abnormal vibration of the plant structures is easily caused. The utility model provides an adopt modal parameter discernment to obtain the modal parameter of factory building structure and vibration source, through laying harmonious mass damper device in the factory building structure to carry out the vibration signal test through unit normal operating mode operation. In the data acquisition process, the response value of the data acquisition equipment reading device is utilized for analysis, and the vibration reduction effect of the factory structure of the tuned mass damper under the normal operation of the unit can be judged. The damping device is suitable for the existing pumped storage power station plant structure and has the advantages of simple structure, simple and convenient construction and low cost.
Drawings
Fig. 1 is a structural diagram of a vibration control device of a pumped storage power station plant structure.
Fig. 2 is a structural front view of a vibration control device of a pumped storage power plant structure.
Fig. 3 is a structural plan view of a vibration control device of a pumped storage power plant structure.
FIG. 4 is a schematic view of the installation of the spring steel plate.
Fig. 5 is a structural view of a spring steel plate.
Fig. 6 is a top view of a bi-directional vibration control device for a pumped storage power plant structure.
FIG. 7 is a technical scheme diagram for vibration control of a pumped storage power plant structure.
FIG. 8 is a graph of structural response time course under the sweep excitation of the structural model.
FIG. 9 is a graph of a structure spectrum under swept frequency excitation of a structure model.
FIG. 10 is a graph of acceleration response time course under a structural model sinusoidal excitation.
FIG. 11 is a graph of acceleration response time course under sinusoidal excitation of a damping structure.
In the figure: 1. spring steel plate, 1a, microscler screw, 1b, bolt hole, 2, counter weight steel sheet, 3, mounting fixture, 3a, anchor clamps curb plate, 3b, connecting plate, 3c, spread groove, 4, first bolt, 4a, first bolt hole, 5, second bolt, 5a, second bolt hole, 6, third bolt.
The specific implementation scheme is as follows:
fig. 1-6 show schematic diagrams of the pumped storage power station plant structure vibration control device provided by the utility model. It includes two counter weight steel sheets 2, mounting fixture 3, spring steel sheet 1 and two connecting plates 3b, spring steel sheet 1's one end is equipped with two microscler screw 1a, the other end is equipped with two bolt holes 1b, be provided with the first bolt hole 4a of four symmetries on the counter weight steel sheet 2, microscler screw 1a is connected through first bolt 4 with first bolt hole 4a, mounting fixture 3 is U type structure, three lateral surface all is provided with two spread groove 3c, one side that connecting plate 3b has second bolt hole 5a passes through second bolt 5 with bolt hole 1b and is connected, the opposite side card goes into spread groove 3 c.
The device still includes anchor clamps curb plate 3a, and 3a lateral surfaces of anchor clamps curb plate set up two spread groove 3c, and anchor clamps curb plate 3a passes through third bolt 6 with mounting fixture 3 to be connected, and when mounting fixture 3's three side and anchor clamps curb plate 3a all were connected with spring steel plate 1, constituted the high-frequency vibration controlling means of steerable two directions.
The device adjusts the natural vibration frequency of the spring steel plate through the horizontal rigidity of the spring steel plate 1 and the mass change of the counterweight steel plate 2, the horizontal rigidity of the spring steel plate 1 is adjusted through the different positions of the long screw holes 1a connected with the counterweight steel plate 2, and the counterweight steel plate 2 can be made of steel plates with different masses and densities.
The utility model provides a pumped storage power station factory building structure vibration control technical route, as shown in FIG. 7, adopt following step:
firstly, arranging an acceleration sensor on a plant structure, and carrying out modal parameter identification on the plant structure through a vibration signal;
secondly, reading the plant structure response by using data acquisition equipment and performing frequency domain analysis to obtain the modal parameters and the vibration source frequency f of the vibration source under the normal operation state of the unit;
thirdly, identifying the position of the plant structure and the vibration source, which resonates, according to the modal parameter information of the plant structure and the vibration source and the acceleration time-course response of each measuring point;
fourthly, analyzing the modal parameters corresponding to the high-order vibration mode, and determining the mass ratio mu of the tuned mass damper to the modal mass corresponding to the controlled high-order vibration mode;
fifth step, passing mass ratio
Determining the mass m of the tuned mass damper;
sixthly, determining the tuning frequency of the tuned mass damper through the optimal tuning frequency ratio
，
；
Seventhly, designing a tuned mass damper device suitable for a pumped storage power station plant structure;
eighthly, determining the structural size, the length L, the height h, the width b and the equivalent stiffness of the spring steel plate (1)
Equivalent mass of
In which moment of inertia
(ii) a WhileThus there are
；
Ninthly, trial calculating the section size of the spring steel plate 1 according to the formula in the previous step, and further determining the length L of the spring steel plate 1;
tenth, connecting the clamp side plate 3a with the fixed clamp 3 through a third bolt 6, and fixing the fixed clamp 3 on the structural column;
step eleven, combining the spring steel plate 1 and the counterweight steel plate 2 together through a first bolt 4 to form a tuned mass damper device;
step ten, connecting the spring steel plate 1, the counterweight steel plate 2 and the fixed clamp 3 into a whole through a second bolt 5;
step thirteen, testing the natural vibration frequency of the tuned mass damper by a knocking test method or other modal testing methods, and tuning the natural vibration frequency of the tuned mass damper by adjusting the connecting position of the counterweight steel plate 2 and the spring steel plate 1 and the mass of the counterweight steel plate 2;
fourteenth, mounting the adjusted tuned mass damper on a structural column generating resonance (the mounting direction is based on the consistency of the first bolt 4 and the vibration direction), and testing the plant structural response of the unit in the normal operation state again;
fifteenth, reading the structural response of the vibration attenuation structure provided with the tuned mass damper by using data acquisition equipment to obtain an acceleration response peak value of the vibration attenuation structure;
sixthly, comparing the structural response of the vibration damping structure with the original structure to judge the vibration damping effect of the tuned mass damper in the factory building structure of the pumped storage power station.
The utility model provides a pumped storage power station factory building structure vibration control device installs it on the factory building structure through independently designing harmonious mass damper, and the data difference of structural response around the analysis damping is gathered, can judge harmonious mass damper under the unit normal operating damping effect of factory building structure. The utility model discloses a solved traditional structure and consolidated with high costs, construction difficulty, effect and do not show the scheduling problem remarkably, provide effective guarantee for pumped storage power station factory building structure vibration problem.
Example analysis
Based on the vibration characteristics of the pumped storage power station plant structure, a group of vibration reduction control model tests suitable for the plant structure are designed.
The structural model is composed of a two-layer steel frame structure, and the electromagnetic vibration table is used for simulating the unit vibration of the pumped storage power station plant in the normal operation state.
Based on the vibration characteristics of the vibration source of the pumping energy storage power station plant unit, the frequency of the vibration source of the unit and the high-order vibration mode of the plant structure have frequency aliasing, so that the high-order vibration mode of the structure model is determined by a mode identification means, and the electromagnetic vibration table is used for outputting a sinusoidal signal with the frequency corresponding to the high-order vibration mode. At this point, the superposition of the excitation frequency and the higher order mode shape of the structure model further amplifies the structure response. In order to suppress the structural response of the structural model, a vibration damping control technique is applied to reduce the structural vibration response.
Modal parameter identification is performed on the structure by applying a sweep frequency vibration signal, the structure response is read by using data acquisition equipment as shown in fig. 8, and frequency domain transformation is performed on the structure response to obtain a frequency domain curve of the structure model as shown in fig. 9, so that each order vibration mode of the structure model is observed.
The fundamental frequency of the structural model is 16.94Hz by analyzing the test result, and 111.3Hz corresponding to the high-order vibration mode of the structure is selected as the output parameter of the vibration source based on the coupling characteristics of the unit vibration source and the high-order vibration mode. The output of the shaking table is set to be 111.3Hz sine wave to perform signal excitation on the structure model, and the acceleration time-course curve of the top layer of the structure under the excitation of the shaking table is read through a data acquisition device, as shown in FIG. 10. The response of the structural model shows that the structural response is amplified due to the interaction of the vibration source and the structural high-order vibration mode, so that the structural response is reduced by adopting the tuned mass damper vibration reduction device in the next step.
Currently, a common tuned mass damper is widely applied to low-frequency vibration control of a high-rise structure and a long-span bridge structure, wherein a spiral spring is adopted as a stiffness unit. While for structures with higher vibration frequencies, the coil spring is insufficient to provide sufficient spring rate for tuned mass dampers. It is therefore contemplated that the use of leaf springs instead of coil springs achieves the goal of tuning higher frequency vibrations. The mass block is symmetrically connected to one side of the spring steel plate by adopting metal with high density, and the other side of the mass block is connected to the top-layer pillar of the structure through a fixing clamp.
The tuned mass damper device firstly selects the mass ratio mu to be 2 percent, and determines the mass of the counterweight steel plate to be 160 g. Tuning the natural frequency of vibration of a mass damper device
Determined as follows:
to obtain its natural frequencyIs 109.11 Hz. According to the natural frequency of the tuned mass damper deviceAnd (4) trial-calculating the section size of the spring steel plate. Wherein the elastic modulus E =200 GPa and the density rho =7.8g/cm of the spring steel plate3。
The length, width and height of the spring steel plate are calculated by trial according to a natural vibration frequency formula and are respectively L =80mm, b =30mm and h =3 mm.
In order to verify the vibration reduction effect of the tuned mass damper, the sine wave with the output frequency of 111.3Hz of the vibration table is similarly set to perform signal excitation on the vibration reduction model, and a data acquisition device is used for reading the acceleration time-course curve of the top layer of the structure under the excitation of the vibration table, as shown in fig. 11. By comparing the acceleration time-course response of the structural model and the vibration damping model, the structural response of the vibration damping model provided with the tuned mass damper device is obviously reduced compared with the response of the original structural model, and the vibration damping efficiency reaches 37%. Therefore, the pumped storage power station plant structure vibration control device based on the tuned mass damper can effectively inhibit the structure vibration, and provides a new idea for solving the problem of pumped storage power station plant structure vibration.
Claims (5)
1. The utility model provides a pumped storage power station factory building structure vibration control device, controlling means includes mounting fixture (3), its characterized in that: the control device also comprises a spring steel plate (1), a counterweight steel plate (2) and a connecting plate (3 b), wherein one end of the spring steel plate (1) is provided with two long screw holes (1 a), and the other end of the spring steel plate is provided with a bolt hole (1 b); a first bolt hole (4 a) is formed in the counterweight steel plate (2), the fixing clamp (3) is of a U-shaped structure, an opening of the U-shaped structure is fixedly connected with a clamp side plate (3 a), two connecting grooves (3 c) fixedly connected with connecting plates (3 b) are formed in each outer side surface of the fixing clamp (3) and the clamp side plate (3 a), and a second bolt hole (5 a) is formed in each connecting plate (3 b); one end of the spring steel plate (1) is inserted between the two connecting plates (3 b) and fixed by a second bolt (5), and two counterweight steel plates (2) are respectively placed on two sides of the other end of the spring steel plate (1) and then fixed by a first bolt (4); when spring steel plates (1) are connected to three side surfaces of the fixing clamp (3) and the clamp side plate (3 a), a high-frequency vibration control device based on tuned mass dampers is formed and controls two directions.
2. The pumped-storage power plant building structure vibration control device of claim 1, wherein: the first bolt (4) penetrates through a first bolt hole (4 a) in the counterweight steel plate (2) and a long bolt hole (1 a) in the spring steel plate (1).
3. The pumped-storage power plant building structure vibration control device of claim 1, wherein: and the second bolt (5) penetrates through a second bolt hole (5 a) in the connecting plate (3 b) and a bolt hole (1 b) in the spring steel plate (1).
4. The pumped-storage power plant building structure vibration control device of claim 1, wherein: the connecting plate (3 b) is fixed in the connecting groove (3 c) by adopting a welding structure.
5. The pumped-storage power plant building structure vibration control device of claim 1, wherein: the clamp side plate (3 a) is fixed at an opening of the U-shaped structure of the fixed clamp (3) by a third bolt (6).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920015008.3U CN210105016U (en) | 2019-01-06 | 2019-01-06 | Pumped storage power station factory building structure vibration control device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920015008.3U CN210105016U (en) | 2019-01-06 | 2019-01-06 | Pumped storage power station factory building structure vibration control device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109518826A (en) * | 2019-01-06 | 2019-03-26 | 大连理工大学 | A kind of hydroenergy storage station mill construction vibration control apparatus and control method |
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2019
- 2019-01-06 CN CN201920015008.3U patent/CN210105016U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109518826A (en) * | 2019-01-06 | 2019-03-26 | 大连理工大学 | A kind of hydroenergy storage station mill construction vibration control apparatus and control method |
| CN109518826B (en) * | 2019-01-06 | 2023-12-19 | 大连理工大学 | Vibration control device and control method for pumped storage power station factory building structure |
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