CN212296721U

CN212296721U - Offshore wind turbine tower drum with variable natural frequency

Info

Publication number: CN212296721U
Application number: CN202020602321.XU
Authority: CN
Inventors: 练继建; 朱航; 王海军; 董霄峰
Original assignee: Tianjin University
Current assignee: Tianjin University
Priority date: 2020-04-21
Filing date: 2020-04-21
Publication date: 2021-01-05
Anticipated expiration: 2030-04-21

Abstract

The utility model discloses an offshore wind turbine tower section of thick bamboo with variable natural frequency, offshore wind turbine tower section of thick bamboo includes tower cylinder body, a plurality of platform and a plurality of quality piece, tower cylinder body comprises a plurality of tower cylinder monomers along vertical direction superpose together, every platform in a plurality of platforms forms adjacent two tower cylinder free connecting portion department, at least some quality piece settings in a plurality of quality pieces are in on a plurality of platforms. The utility model discloses an at the inside additional quality piece of a tower section of thick bamboo, under the prerequisite of not changing tower section of thick bamboo rigidity, increase the quality of a tower section of thick bamboo, and then change the natural frequency of a tower section of thick bamboo, can effectually avoid a tower section of thick bamboo resonance to destroy.

Description

Offshore wind turbine tower drum with variable natural frequency

Technical Field

The utility model relates to a tower section of thick bamboo technique, in particular to offshore wind turbine tower section of thick bamboo with variable natural frequency.

Background

With the continuous development of onshore wind resources, onshore wind farm construction has gradually become saturated. After the oil crisis in the 70 s of the 20 th century, a new era of wind energy utilization began, and many countries in the world began to make plans considering the development of offshore wind farms. Compared with a land fan, the offshore fan has a worse working environment, and particularly has more technical challenges in China sea areas with frequent typhoons and earthquakes. The tower barrel is used as an important bearing part of the wind turbine and plays an important role in the design of the wind turbine. When wind passes through the tower, vortices are alternately generated on both sides of the tower, which are detached from the surface of the tower. This alternately generated vortex in turn generates a periodically varying pulsating pressure on the tower. The pulsating pressure will cause periodic oscillations of the tower, which in turn will change the vortex shedding pattern of its wake. The problem of fluid interaction with structures is known as "vortex-induced vibration," which can cause resonant failure of the tower if the natural frequency of the tower is close to the frequency of the vortex. In addition, if the natural frequency of the whole fan system is close to the 1P or 3P frequency, the tower can also be damaged by resonance.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the problem that above-mentioned exists, provide an offshore wind turbine tower section of thick bamboo with variable natural frequency, can effectually avoid a tower section of thick bamboo resonance to destroy. The utility model discloses an at the inside additional quality piece of a tower section of thick bamboo, under the prerequisite of not changing tower section of thick bamboo rigidity, increase the quality of a tower section of thick bamboo, and then change the natural frequency of a tower section of thick bamboo.

The utility model adopts the technical proposal that: an offshore wind turbine tower having a variable natural frequency, the offshore wind turbine tower comprising:

the tower drum body is composed of a plurality of tower drum single bodies which are overlapped together along the vertical direction;

a plurality of platforms, each platform of the plurality of platforms formed at a connection of two adjacent tower cells; and

a plurality of masses, at least some of the plurality of masses disposed on the plurality of platforms.

Further, the plurality of platforms are disposed within the tower body and extend horizontally inward from an inner surface of the tower body.

Further, the plurality of platforms are integral with or connected to the tower body.

Further, the tower body has a cylindrical shape and the plurality of platforms have an annular shape.

Further, the at least some masses are disposed on an uppermost platform of the plurality of platforms.

Further, the at least some masses are arranged on the uppermost platform at equal intervals in the circumferential direction.

Further, the mass block has a rectangular parallelepiped shape.

Further, the height of the mass is lower than 3 m.

Further, the height of the mass is below 2 m.

The utility model has the advantages that: the utility model discloses offshore wind turbine tower section of thick bamboo with variable natural frequency, simple structure, construction convenience, it is with low costs. Through adding the mass block in the tower cylinder, the mass of the tower cylinder is increased on the premise of not changing the rigidity of the tower cylinder, so that the natural frequency of the tower cylinder is changed, 1P or 3P load of the running of the fan can be avoided, and the risk of resonance of the fan is reduced. Additionally, the utility model discloses applicable in various types of basis, like single pile basis, jacket basis and suction section of thick bamboo basis etc. extensive applicability is general. The utility model can be used as a post remedy and is not considered in the design of the earlier stage.

Drawings

FIG. 1: the utility model relates to a profile schematic diagram of a tower drum of an offshore wind turbine with variable natural frequency;

FIG. 2: the utility model discloses a schematic diagram of a mass block;

the attached drawings are marked as follows:

1-tower body;

11-tower tube monomer;

2-a platform;

and 3, mass block.

Detailed Description

For further understanding of the contents, features and functions of the present invention, the following embodiments will be exemplified in conjunction with the accompanying drawings as follows:

as shown in fig. 1 and 2, an offshore wind turbine tower with variable natural frequency includes a tower body 1, a plurality of platforms 2, and a plurality of mass blocks 3.

The tower body 1 has a cylindrical shape and is formed by a plurality of tower cells 11 stacked together in the vertical direction.

Each platform 2 of the plurality of platforms 2 is formed at the connecting part of two adjacent tower cells 11; the platforms 2 may be integrated with the tower body 1, or may be connected to the tower body 1; the plurality of platforms 2 are disposed inside the tower body 1 and extend horizontally inward from the inner surface of the tower body 1, and have a ring shape.

At least some of the masses 3 of the plurality of masses 3 are arranged on the plurality of platforms 2, a corresponding number of masses 3 being arrangeable according to the mass requirements. For optimal tower natural frequency variation, the at least some masses 3 are arranged on the uppermost platform 2 of the plurality of platforms 2. In addition, the at least some of the masses 3 are arranged on the uppermost platform 2 at equal intervals in the circumferential direction, and the masses 3 are separated by a certain distance and independent of each other. The mass block 3 has a cuboid shape, the mass block 3 cannot be too high, and the height of the mass block 3 is preferably lower than 3m, and most preferably lower than 2 m.

Although the preferred embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention, which is within the protection scope of the present invention.

Claims

1. An offshore wind turbine tower having a variable natural frequency, the offshore wind turbine tower comprising:

the tower cylinder body (1), the tower cylinder body (1) is composed of a plurality of tower cylinder single bodies (11) which are overlapped together along the vertical direction;

a plurality of platforms (2), wherein each platform (2) in the plurality of platforms (2) is formed at the connecting part of two adjacent tower single bodies (11); and

a plurality of masses (3), at least some of the masses (3) of the plurality of masses (3) being disposed on the plurality of platforms (2).

2. The offshore wind turbine tower of claim 1, wherein the plurality of platforms (2) are disposed inside the tower body (1) and extend horizontally inwardly from an inner surface of the tower body (1).

3. Offshore wind turbine tower according to claim 2, characterised in that the platforms (2) are integral with the tower body (1) or connected to the tower body (1).

4. Offshore wind turbine tower according to claim 2, characterised in that the tower body (1) has a cylindrical shape and the plurality of platforms (2) has an annular shape.

5. Offshore wind turbine tower according to any of the claims 1 to 4, characterized in that said at least some masses (3) are arranged on the uppermost platform (2) of said plurality of platforms (2).

6. Offshore wind turbine tower according to claim 5, characterised in that said at least some masses (3) are arranged on said uppermost platform (2) at equal intervals in the circumferential direction.

7. Offshore wind turbine tower according to claim 1, characterised in that the mass block (3) has a cuboid shape.

8. Offshore wind turbine tower according to claim 1, characterised in that the height of the mass blocks (3) is below 3 m.

9. Offshore wind turbine tower according to claim 8, characterised in that the height of the mass blocks (3) is below 2 m.