CN-122014508-A - CFRP reinforcement and vibration reduction method and system for wind driven generator tower

CN122014508ACN 122014508 ACN122014508 ACN 122014508ACN-122014508-A

Abstract

The invention provides a CFRP reinforcement and vibration reduction method and system for a wind driven generator tower, and belongs to the technical field of wind power equipment. The CFRP plates are firstly applied to reinforcement of the wind driven generator tower and the concrete arrangement mode thereof, wherein a plurality of CFRP plates with the whole length are arranged on the periphery of the tower, each CFRP plate is supported outwards for a certain distance through a middle supporting structure and a bottom supporting structure, two ends of each CFRP plate are fixed on the top supporting structure and the bottom supporting structure through anchors, reinforcement and vibration reduction of the wind driven generator tower are achieved, then wake interference factors and load adjustment coefficients are introduced, an objective function is optimized, CFRP plate parameters of optimal reinforcement and vibration reduction are obtained, and finally, the reinforcement and vibration reduction mechanisms are generated based on the particularity of CFRP materials and structures, so that the CFRP plates can block and bear more wind loads.

Inventors

ZHAO XIAOQING
CHENG YIKAI
YUE QINGRUI

Assignees

北京科技大学

Dates

Publication Date: 20260512
Application Date: 20251231

Claims (9)

1. A method of CFRP reinforcement and vibration damping for a wind turbine tower, the method comprising: s1, obtaining a motion equation of a first-order mode of a structure according to an original structure of a wind driven generator; s2, obtaining a simplified motion equation of the wake vibrator through a Van der Waals equation according to the aggregate size of the original structure of the wind driven generator; S3, obtaining a fluid-solid coupling equation of the tower barrel and the wake vibrator according to the motion equation of the first-order mode of the structure and the simplified motion equation of the wake vibrator; S4, according to a fluid-solid coupling equation of the tower and the wake vibrator, solving through a multi-scale method and obtaining a first response amplitude of the tower under the condition of frequency locking; S5, installing CFRP plates on the original structure of the wind driven generator to obtain a primarily reinforced and vibration-damped wind driven generator tower structure; S6, introducing wake interference factors according to the first response amplitude of the tower and the primarily reinforced and damped wind driven generator tower structure to obtain a second response amplitude of the tower; s7, according to the primarily reinforced and vibration-damped wind driven generator tower barrel structure, a load adjustment coefficient is obtained through load change of the wind driven generator in the downwind direction; S8, according to the second response amplitude of the tower and the load adjustment coefficient, parameters and the number of CFRP plates are obtained by optimizing an objective function; And S9, installing the CFRP plates on the original structure of the wind driven generator according to the parameters and the number of the CFRP plates to obtain the reinforced and vibration-damped wind driven generator tower cylinder device.
2. The CFRP reinforcement and vibration reduction method for a wind turbine tower of claim 1 wherein said load adjustment factor calculation method includes: (1) In the formula, For the load adjustment coefficient, y 1 is a first experimental parameter, y 2 is a second experimental parameter, y 3 is a third experimental parameter, and R is the coverage rate of the CFRP plate on the projection surface of the tower of the wind driven generator.
3. The method for CFRP reinforcement and vibration reduction of a tower of a wind turbine of claim 2 wherein said method for calculating the coverage rate R of CFRP plates on the projected surface of the tower comprises: (2) Wherein n is the number of CFRP plates, W is the width of the CFRP plates, L is the distance between the CFRP plates, and D is the diameter of the wind driven generator tower.
4. The method for reinforcing and damping CFRP used for wind turbine tower according to claim 1, wherein said reinforcing and damping wind turbine tower device comprises a top fixing unit, a supporting unit, a fixing support, a CFRP plate, an anchoring unit; The top fixing unit anchor ear is fixed on the tower section of thick bamboo, the supporting unit twines around the tower section of thick bamboo is used for strengthening the holding power of CFRP board, the fixed bolster is installed the bottom of tower section of thick bamboo is used for fixing the tower section of thick bamboo, CFRP board vertical installation is in on the tower section of thick bamboo is fixed through the anchor unit with the top fixing unit is used for strengthening the tower section of thick bamboo, the anchor unit is installed the fixed bolster is used for fixing the CFRP board.
5. The CFRP reinforcement and vibration reduction method for a wind turbine tower of claim 4 wherein said top fixture unit includes a top semi-circular member and a sloped cantilever member; The top semicircular member hoop is fixed at the top of the tower, the inclined cantilever member is fixedly connected with the top semicircular member, and the inclined cantilever member is used for fixing the CFRP plate.
6. The CFRP reinforcement and vibration reduction method for a wind turbine tower of claim 4 wherein said support unit comprises a support semi-circular member, a horizontal cantilever member and round steel; the support semicircular member hoop is fixed on the tower, the plurality of horizontal cantilever members are connected with the support semicircular member and the plurality of round steels, and the round steels contact and support the CFRP plate.
7. The method for CFRP reinforcement and vibration reduction of a wind turbine tower of claim 4 wherein said stationary support includes a stationary semi-circular member and a reinforcing cantilever member; The fixed semicircular member hoop is fixed at the bottom of the tower barrel, and the reinforced cantilever member is used for fixedly connecting the fixed semicircular member and the anchoring unit.
8. The method for reinforcing and damping CFRP for a tower of a wind turbine according to claim 4, wherein said anchoring unit comprises a U-shaped clamp, a wedge-shaped clamp, a CFRP clamp, a baffle and a stopper; The CFRP fixture is used for fixing the CFRP plate and is in sliding connection with the U-shaped fixture through the wedge-shaped clamping head, the baffle is fixedly arranged at two ends of the U-shaped fixture and used for fixing the wedge-shaped clamping head and the CFRP fixture, and the U-shaped fixture is fixedly connected to the fixing support through the limiting piece.
9. CFRP reinforcement and vibration reduction system for a wind power generator tower for implementing a CFRP reinforcement and vibration reduction method for a wind power generator tower according to any of the claims 1-8, characterized in that said system comprises: The first conversion module is used for obtaining a motion equation of a first-order mode of the structure according to the original structure of the wind driven generator; the second conversion module is used for obtaining a simplified motion equation of the wake vibrator through a Van der Waals equation according to the aggregate size of the original structure of the wind driven generator; the fluid-solid coupling module is used for obtaining a fluid-solid coupling equation of the tower barrel and the wake vibrator according to the motion equation of the first-order mode of the structure and the simplified motion equation of the wake vibrator; the first response module is used for solving through a multi-scale method according to a fluid-solid coupling equation of the tower and the wake vibrator and obtaining a first response amplitude of the tower under the condition of frequency locking; The first reinforcement module is used for installing a CFRP plate on the original structure of the wind driven generator to obtain a primarily reinforced and vibration-damped wind driven generator tower structure; The second response module is used for introducing wake interference factors according to the first response amplitude of the tower and the primary reinforcement and vibration reduction wind driven generator tower structure to obtain a second response amplitude of the tower; the load adjusting module is used for obtaining a load adjusting coefficient according to the primary reinforcement and vibration reduction wind driven generator tower barrel structure through load change of the wind driven generator in the downwind direction; The parameter acquisition module is used for obtaining parameters and quantity of the CFRP plates by optimizing an objective function according to the second response amplitude of the tower and the load adjustment coefficient; and the second reinforcement module is used for installing the CFRP plates on the original structure of the wind driven generator according to the parameters and the number of the CFRP plates to obtain the reinforced and vibration-damped wind driven generator tower cylinder device.

Description

CFRP reinforcement and vibration reduction method and system for wind driven generator tower Technical Field The invention relates to the technical field of wind power equipment, in particular to a CFRP reinforcement and vibration reduction method and system for a wind driven generator tower. Background With the promotion of the development mode of large-scale, centralized and remote in the wind power industry in China, the single-machine capacity of the wind driven generator is continuously improved, and the height and the diameter of the tower barrel are also increased so as to meet the requirement of higher wind energy capturing efficiency. However, the safety and durability of the tower as a supporting structure are directly related to the running stability and service life of the whole machine. In the long-term service process, the tower of the wind driven generator is easy to damage due to the action of multiple factors, and mainly comprises the following three types of (1) vibration damage, vibration and vibration of the tower, long-term bearing of pulsating wind load, blade rotation excitation and earthquake action, easy generation of resonance response, structural fatigue accumulation, weld cracking, component failure and even whole collapse caused by serious conditions, (2) environmental erosion and mechanical property degradation, especially when the tower in coastal areas is in marine corrosion environment for a long time, steel materials in spray splashing areas and tidal areas are easy to rust, wall thickness is reduced, rigidity is reduced, and (3) local buckling and whole instability are easy to occur under extreme loads as the height of the tower increases, and the diameter-thickness ratio of the tower increases. Aiming at the problems, various technical means have been developed in the prior art to improve the structural safety and stability of the tower, and the method is mainly divided into three directions of tower reinforcement, energy consumption vibration reduction, vibration absorption and vibration reduction: (1) Tower drum reinforcing technology The tower drum reinforcing technology resists damage by enhancing the structural strength and rigidity of the tower drum, and the main stream scheme comprises a cross section increasing method, an interlayer ribbed structure reinforcing method and the like. The tower cylinder reinforcing technology directly improves the rigidity and the bearing capacity of the tower cylinder, is suitable for the existing tower cylinder reconstruction, but has inherent limitations, namely, the reinforcing effect is single, the strength and the rigidity are mainly focused, the dynamic response is difficult to effectively inhibit, and the construction complexity of a part of schemes is high, for example, an interlayer ribbed structure needs to be cast in place with concrete and welded, the construction period is long, the requirement on the construction precision is high, the dead weight of the structure can be obviously increased, and the economy and the basic design are influenced. (2) Energy consumption vibration damping technology The energy consumption vibration reduction technology reduces structural response by consuming vibration energy, and common devices comprise viscous dampers, friction dampers and the like, and are mostly connected with the tower barrel structure in parallel or in series. The wind turbine generator system has the core advantages that the passive control mechanism is stable, external power input is not needed, the wind turbine generator system is adapted to long-term unattended operation scenes, the structural form of the damper is flexible, and parameters can be adjusted according to the size and load characteristics of the tower. But the defects are also remarkable, namely, the energy consumption device is limited by the space of the tower, the effect of the traditional shearing type damper is limited on the structure with the main bending deformation of the tower, and the performance of part of the damper (such as a viscous damper) is easily influenced by the ambient temperature, so that the long-term service stability is required to be improved. (3) Vibration absorption and damping technology The vibration absorption and reduction technology utilizes devices such as a tuned mass damper, a pendulum tuned mass damper, a prestress tuned mass damper and the like, absorbs the vibration energy of the tower drum through a resonance principle, has simple structure and high reliability, is suitable for a long-period structure, and is one of the main stream technologies of current wind tower vibration reduction. However, the technology has the defects that the traditional device is limited by the inner space of a tower barrel, the mass ratio is difficult to be greatly improved, the vibration reduction efficiency is limited, and the traditional device is sensitive to frequency deviation, needs to be accurately tuned and is easy to be out