CN215059134U - Pre-stress annular tuned mass damper mounting structure for vibration reduction of fan tower - Google Patents
Pre-stress annular tuned mass damper mounting structure for vibration reduction of fan tower Download PDFInfo
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- CN215059134U CN215059134U CN202120660550.1U CN202120660550U CN215059134U CN 215059134 U CN215059134 U CN 215059134U CN 202120660550 U CN202120660550 U CN 202120660550U CN 215059134 U CN215059134 U CN 215059134U
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Abstract
The utility model discloses a harmonious mass damper mounting structure of prestressing force annular for fan pylon damping is located one section of the top be provided with harmonious mass damper of prestressing force annular in the tower section of thick bamboo. By adopting the technical scheme, energy is dissipated by utilizing the inertia force generated by the annular mass body, the prestress and the suspension height of the annular mass body can be flexibly adjusted through the upper prestress stay cable and the lower prestress stay cable, so that the frequency of the annular mass body is doubly tuned, and the cable through hole is formed in the annular mass body, so that the passing of a cable is not influenced, and the installation and maintenance mode of wind power equipment is not changed; the prestressed annular tuned mass damper has the advantages of simple structure, definite force transmission and stable system, and the design of the single-tuning and double-tuning cooperative functions is suitable for high-frequency wind vibration or small vibration and composite vibration damping control of rare large vibration, is flexible in arrangement position and can be applied to high-flexibility tower bodies of various sizes and specifications.
Description
Technical Field
The utility model relates to a wind power generation equipment technical field, concretely relates to harmonious mass damper mounting structure of prestressing force annular for fan pylon damping.
Background
Wind power has the obvious advantages of no pollution, reproducibility, low cost, wide distribution and the like, and in recent years, the wind power is valued by all countries in the world and gradually becomes a main force of clean energy. By the end of 2019, the installed wind power capacity of China reaches 2.21 hundred million kW, and the squat is the first in the world. In order to improve the power generation efficiency and adapt to the running requirements of wind turbine generators in low wind speed areas, the wind turbine is developed in the direction of large megawatt, the tower structure of the wind turbine tower gradually becomes high and flexible, so that the self-vibration frequency of the wind turbine is reduced, and the self-vibration frequency of the wind turbine tower gradually approaches to the external load frequency of wind, waves and the like, so that the resonance of the wind turbine tower is easily caused. The excessive vibration not only reduces the self fatigue life of the tower, but also has great influence on the performance of the generator set, and can reduce the whole service life of the fan and reduce the generating efficiency. Therefore, the development of the wind turbine in the direction of large megawatt must solve the problem of excessive vibration of the tower.
In recent years, more scholars and engineers propose various theoretical conceptual designs of passive vibration reduction techniques and devices for fans, which are mainly divided into two types, namely Tuned Liquid Dampers (TLD) and Tuned Mass Dampers (TMD).
The tuned liquid damper is a typical and effective passive structure vibration reduction control device, and the principle of vibration reduction control is to fix a water tank on a controlled structure, and to form vibration reduction force by the dynamic pressure difference generated on two sides of the inner wall of a container by the liquid in the water tank shaking. However, the biggest bottleneck in the application of tuned liquid dampers to wind turbine towers is that the control force is difficult to calculate accurately due to irregular fluid fluctuation in the water tank, so the theory of the device is to be further improved.
The tuned mass damper adjusts the vibration frequency of the mass block to be close to the main vibration frequency of the fan tower, and energy is transferred from the fan tower to the mass damper through the interaction between the tuned mass damper and the fan tower, so that the transfer purpose is achieved. And harmonious mass damper divide into supporting formula TMD and suspension type TMD, and supporting formula TMD generally need arrange in the top of fan, but fan top cabin space is limited, is unfavorable for arranging. Therefore, the suspended TMD is arranged inside the tower barrel of the wind turbine and can be operated, but the frequency of the suspended TMD can be adjusted only through the swing length, the swing angle of the suspended TMD is very small due to the extremely limited space inside the tower barrel, and the control force provided under the small swing angle is very limited, so that the damping effect is not ideal.
It is urgent to solve the above problems.
SUMMERY OF THE UTILITY MODEL
For solving above technical problem, the utility model provides a harmonious mass damper mounting structure of prestressing force annular for fan pylon damping.
The technical scheme is as follows:
the utility model provides a harmonious mass damper mounting structure of prestressing force annular for fan tower damping, includes the pylon and installs the cabin at the pylon top, the pylon comprises a plurality of sections tower section of thick bamboo that connects gradually through the ring flange, and its main points lie in, lie in one section the tower section of thick bamboo is provided with harmonious mass damper of prestressing force annular, and this harmonious mass damper of prestressing force annular includes:
the annular mass body is of a cylindrical structure and forms a cable through hole for a cable to pass through;
the dampers are uniformly distributed along the circumferential direction of the annular mass body, and two ends of each damper are respectively connected with the outer wall of the annular mass body and the inner wall of the corresponding tower barrel;
the upper prestressed guy cables are uniformly distributed around the central axis of the annular mass body, and two ends of each upper prestressed guy cable are respectively connected with the upper end surface of the annular mass body and the bottom of the engine room;
and the two ends of each lower prestressed stay cable are respectively connected with the lower end face of the annular mass body and the flange plate corresponding to the lower end of the tower cylinder.
Aiming at the special structure and vibration characteristics of the current mainstream horizontal axis type fan tower cylinder structure, because the available space of the fan tower structure is limited, on the premise of not changing the installation and maintenance mode of wind power equipment, the structure is adopted, the annular mass body is designed to be cylindrical, the energy is dissipated by using the inertia force generated by the annular mass body, the prestress and the suspension height of the annular mass body can be flexibly adjusted by using the upper prestress stay cable and the lower prestress stay cable, so that the self frequency of the annular mass body can be doubly tuned, in the service environment, when the horizontal amplitude at the top of the tower cylinder is small, the annular mass body can rapidly generate corresponding horizontal vibration under the action of the inertia force, and under the action of the prestress stay cable, the inertia force generated by the motion of the annular mass body can react on the structure, so that the vibration damping effect is generated; moreover, the annular mass body is provided with the cable through hole, so that the passing of a cable is not influenced, and the installation and maintenance mode of the wind power equipment is not changed; the prestressed annular tuned mass damper has the advantages of simple structure, definite force transmission and stable system, and the design of the single-tuning and double-tuning cooperative functions is suitable for high-frequency wind vibration or small vibration and composite vibration damping control of rare large vibration, is flexible in arrangement position and can be applied to high-flexibility tower bodies of various sizes and specifications.
Preferably, the method comprises the following steps: the damper is a viscous damper. By adopting the structure, the viscous damper not only can provide stable and reliable additional damping, but also can play a role in guiding and limiting, and can be used as a composite vibration damping element to avoid the frequency imbalance problem caused by a large swing angle, thereby realizing the double tuning function of the annular mass body under the large-amplitude vibration.
Preferably, the method comprises the following steps: one end of each viscous damper is connected with the inner wall of the corresponding tower barrel through an inner side spherical hinge, and the other end of each viscous damper is connected with the outer wall of the annular mass body through an outer side spherical hinge. By adopting the spherical hinge connection structure, the control forces of the dampers arranged in two-way dimensions can be prevented from influencing each other, the effect of resisting two-way multidimensional earthquake can be achieved, and multidirectional vibration reduction can be realized along with the yawing of the wind turbine.
Preferably, the method comprises the following steps: the upper end of each upper prestressed cable is connected with the bottom of the engine room through an upper connecting piece, and each lower prestressed cable is installed in a bolt hole corresponding to the flange plate through a lower connecting piece. By adopting the structure, the structure is simple, reliable and convenient to assemble.
Preferably, the method comprises the following steps: the number of the upper prestressed stay cables and the number of the lower prestressed stay cables are three, and the number of the dampers is three. By adopting the design, the number of parts is reduced on the premise of ensuring the damping performance and the reliability, the assembly difficulty is reduced, and the cost is reduced.
Preferably, the method comprises the following steps: the annular mass body is formed by casting iron, has high structural strength, is not easy to deform, ensures the long-term reliability of the damping performance, and has lower cost.
Compared with the prior art, the beneficial effects of the utility model are that:
by adopting the installation structure of the prestressed annular tuned mass damper for the vibration reduction of the fan tower frame, the energy is dissipated by utilizing the inertia force generated by the annular mass body, the prestress and the suspension height of the annular mass body can be flexibly adjusted through the upper prestressed stay cable and the lower prestressed stay cable, so that the self frequency of the double tuned annular mass body is realized, and the cable through hole is formed in the annular mass body, so that the passing of a cable is not influenced, and the installation and maintenance mode of wind power equipment is not changed; the prestressed annular tuned mass damper has the advantages of simple structure, definite force transmission and stable system, and the design of the single-tuning and double-tuning cooperative functions is suitable for high-frequency wind vibration or small vibration and composite vibration damping control of rare large vibration, is flexible in arrangement position and can be applied to high-flexibility tower bodies of various sizes and specifications.
Drawings
FIG. 1 is a schematic view of a wind turbine;
FIG. 2 is a schematic view of a fitting relationship of a pre-stressed annular tuned mass damper mounting structure and a nacelle;
figure 3 is a schematic diagram of a pre-stressed annular tuned mass damper mounting structure.
Detailed Description
The present invention will be further described with reference to the following examples and accompanying drawings.
As shown in fig. 1 and 2, a prestressed annular tuned mass damper mounting structure for vibration reduction of a wind turbine tower comprises a main tower 1 and a nacelle 2 mounted at the top of the tower 1, wherein the tower 1 is composed of a plurality of tower barrels 1a sequentially connected by flange plates 1b, and a prestressed annular tuned mass damper is arranged in the tower barrel 1a at the top, and specifically comprises the following components:
referring to fig. 2 and 3, the prestressed circular tuned mass damper includes a circular mass body 3, at least three dampers 4, at least three upper prestressed cables 5 and at least three lower prestressed cables 6.
Wherein, annular mass body 3 is the cylinder structure to utilize the inertial force that annular mass body 3 produced to dissipate energy, the central point of annular mass body 3 puts the cable via hole 3a that forms the confession cable 7 and pass through simultaneously, does not influence passing through of cable 7, thereby can not change wind power equipment installation maintenance mode.
Each damper 4 is evenly distributed along the circumference of the annular mass body 3, and the two ends of each damper 4 are respectively connected with the outer wall of the annular mass body 3 and the inner wall of the corresponding tower barrel 1a, so that stable and reliable additional damping can be provided, and the damping effect is improved.
Further, the damper 4 is a viscous damper, which not only can provide stable and reliable additional damping, but also can play a role in guiding and limiting, and can be used as a composite vibration damping element to avoid frequency imbalance caused by a large swing angle, thereby realizing the double tuning function of the annular mass body under large-amplitude vibration.
Furthermore, one end of each viscous damper is connected with the inner wall of the corresponding tower barrel 1a through an inner spherical hinge 8, the other end of each viscous damper is connected with the outer wall of the annular mass body 3 through an outer spherical hinge 9, the control force of the dampers arranged in the two-way dimension cannot be influenced mutually, the effect of resisting the two-way multi-dimensional earthquake can be achieved, and multi-way vibration reduction can be achieved along with yawing of the wind turbine.
Each upper prestressed stay 5 is uniformly distributed around the central axis of the annular mass body 3, and two ends of each upper prestressed stay 5 are respectively connected with the upper end surface of the annular mass body 3 and the bottom of the engine room 2. Similarly, each lower prestressed stay 6 is uniformly distributed around the central axis of the annular mass body 3, and two ends of each lower prestressed stay 6 are respectively connected with the lower end face of the annular mass body 3 and the flange 1b corresponding to the lower end of the tower barrel 1 a. By providing the upper pre-stressed cables 5, a horizontal counter-control force can be provided which counteracts the movement of the top nacelle 2. Meanwhile, the lateral rigidity of the movement of the annular mass body 3 can be provided by the matching of the upper prestressed stay 5 and the lower prestressed stay 6, and the frequency of the annular mass body 3 is doubly tuned by matching the suspension height.
Therefore, the position of the annular mass body 3 can be flexibly adjusted according to the size of the tower type of the wind driven generator by the lengths of the upper prestressed stay 5 and the lower prestressed stay 6, and the annular mass body can be freely suspended between the engine room 2 and the flange plate 1b corresponding to the lower end of the tower 1a on the premise of meeting the requirements of reasonable tuning frequency and guaranteeing the set function.
Further, the upper end of each upper prestressed cable 5 is connected to the bottom of the nacelle 2 through an upper connector 10, and each lower prestressed cable 6 is mounted in a corresponding bolt hole 1b1 of the flange 1b through a lower connector 11. In this embodiment, the upper connecting member 10 and the lower connecting member 11 are preferably riveted, which is not only firm and reliable, but also easy to assemble. It should be noted that the upper prestressed stay 5 and the lower prestressed stay 6 are fixedly connected to the upper and lower end faces of the annular mass body 3, respectively. In this embodiment, the annular mass body 3 is formed by iron casting, has high structural strength, is not easy to deform, ensures the long-term reliability of the damping performance, and has lower cost. Therefore, the lower end portion of the upper prestressed cable 5 and the lower end portion of the lower prestressed cable 6 may be integrally formed in the annular mass body 3 through a casting process, thereby greatly improving the connection strength therebetween and improving the service life.
In this embodiment, the preferred three of attenuator 4, interval 120 is arranged between adjacent attenuator 4, upper portion prestressing force cable 5 and lower part prestressing force cable 6 are all preferred three also, interval 120 is arranged between adjacent upper portion prestressing force cable 5, interval 120 is arranged between adjacent lower part prestressing force cable 6, under the prerequisite that can guarantee damping performance and reliability, reduce the quantity of spare part, both reduced the assembly degree of difficulty, and the cost is reduced again, the maintenance of being convenient for simultaneously.
When the horizontal amplitude of the top of the tower barrel 1a is small, the annular mass body 3 rapidly generates corresponding horizontal vibration under the action of inertia force, and the inertia force generated by the motion of the vibration damping mass block reacts on the structure under the action of the upper prestressed stay 5 and the lower prestressed stay 6, so that the vibration damping effect is generated. When the amplitude of the tower cylinder 1a excited by the ambient wind speed or the first frequency doubling exciting force (1P) and the third frequency doubling exciting force (3P) is small and the control force output meets the requirement, the working frequency of the tower cylinder is tuned independently only by the annular mass body 3 to reduce the vibration. When the structural resonance is excited by the tower drum 1a excited by the ambient wind speed or the first frequency doubling exciting force (1P) and the third frequency doubling exciting force (3P) to cause the tower drum to have larger amplitude or the output control force of the annular mass body 3 is insufficient, the annular mass body 3 and the viscous damper are compounded to doubly tune the working frequency of the tower drum for vibration reduction. The inner spherical hinge 8 of the viscous damper transmits force to the annular mass body 3, and the viscous damper generates damping force along with the annular mass body 3 under large-amplitude vibration.
The field experiment proves that through the test of a 3.4MW fan reduced scale model vibration table additionally provided with the prestress annular tuned mass damper, the vibration reduction efficiency of the device can reach more than 40%, part of working conditions can reach more than 50%, and the deformation of the bottom of the tower cylinder additionally provided with the prestress annular tuned mass damper is smaller, so that the top displacement of the tower cylinder is reduced by the vibration reduction device, the P-delta second-order effect is reduced, and the influence of additional bending moment is further reduced.
Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and the scope of the present invention.
Claims (6)
1. The utility model provides a harmonious mass damper mounting structure of prestressing force annular for fan tower damping, includes tower (1) and installs cabin (2) at tower (1) top, tower (1) comprises a plurality of sections tower section of thick bamboo (1a) that connect gradually through ring flange (1b), its characterized in that, is located one section the tower section of thick bamboo (1a) is provided with harmonious mass damper of prestressing force annular, and this harmonious mass damper of prestressing force annular includes:
an annular mass body (3) having a cylindrical structure and forming a cable through hole (3a) through which a cable (7) passes;
the dampers (4) are uniformly distributed along the circumferential direction of the annular mass body (3), and two ends of each damper (4) are respectively connected with the outer wall of the annular mass body (3) and the inner wall of the corresponding tower barrel (1 a);
the upper prestress guy cables (5) are uniformly distributed around the central axis of the annular mass body (3), and two ends of each upper prestress guy cable (5) are respectively connected with the upper end surface of the annular mass body (3) and the bottom of the engine room (2);
the lower prestress stay ropes (6) are uniformly distributed around the central axis of the annular mass body (3), and two ends of each lower prestress stay rope (6) are respectively connected with the lower end face of the annular mass body (3) and the flange (1b) corresponding to the lower end of the tower barrel (1 a).
2. The pre-stressed annular tuned mass damper mounting structure for wind turbine tower damping of claim 1, wherein: the damper (4) is a viscous damper.
3. The pre-stressed annular tuned mass damper mounting structure for wind turbine tower damping of claim 2, wherein: one end of each viscous damper is connected with the inner wall of the corresponding tower barrel (1a) through an inner side spherical hinge (8), and the other end of each viscous damper is connected with the outer wall of the annular mass body (3) through an outer side spherical hinge (9).
4. The pre-stressed annular tuned mass damper mounting structure for wind turbine tower damping of claim 1, wherein: the upper ends of the upper prestressed cables (5) are connected with the bottom of the engine room (2) through upper connecting pieces (10), and the lower prestressed cables (6) are installed in bolt holes (1b1) corresponding to the flange plate (1b) through lower connecting pieces (11).
5. The pre-stressed annular tuned mass damper mounting structure for wind turbine tower damping of claim 1, wherein: the number of the upper prestressed stay cables (5) and the number of the lower prestressed stay cables (6) are three, and the number of the dampers (4) is three.
6. The pre-stressed annular tuned mass damper mounting structure for wind turbine tower damping of claim 1, wherein: the annular mass body (3) is formed by iron casting.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120660550.1U CN215059134U (en) | 2021-03-31 | 2021-03-31 | Pre-stress annular tuned mass damper mounting structure for vibration reduction of fan tower |
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| CN202120660550.1U CN215059134U (en) | 2021-03-31 | 2021-03-31 | Pre-stress annular tuned mass damper mounting structure for vibration reduction of fan tower |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114508462A (en) * | 2022-01-13 | 2022-05-17 | 重庆大学 | Installation device and system for circular tower tube shock absorber of wind turbine generator system |
| CN115030016A (en) * | 2022-06-23 | 2022-09-09 | 河海大学 | Double-tuned mass damper for vibration reduction of suspension cable of suspension bridge |
-
2021
- 2021-03-31 CN CN202120660550.1U patent/CN215059134U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114508462A (en) * | 2022-01-13 | 2022-05-17 | 重庆大学 | Installation device and system for circular tower tube shock absorber of wind turbine generator system |
| CN115030016A (en) * | 2022-06-23 | 2022-09-09 | 河海大学 | Double-tuned mass damper for vibration reduction of suspension cable of suspension bridge |
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