Vibration monitoring device of wind turbine generator tower drum

Abstract

The invention discloses a vibration monitoring device for a wind turbine generator tower, which comprises an arc-shaped sheet, a connecting assembly and a vibration sensor, and is characterized in that the connecting assembly comprises a spring, a damper and a connecting plate, the spring sleeves the damper, and two ends of the spring and two ends of the damper are fixedly connected with the connecting plate; the plurality of arc-shaped sheets are connected end to end through the connecting assemblies to form an internally-buckled circular ring, and more than one vibration sensor is fixed on the inner surface of each internally-buckled arc-shaped sheet; according to the invention, rapid installation is realized, the working time is obviously shortened, the wide adaptability to the diameter change of the tower drum and high-reliability vibration monitoring are realized, and an efficient and low-cost field monitoring means is provided for structural health assessment, fatigue analysis and safety early warning of the wind turbine generator tower drum.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind turbine structure safety detection, and in particular relates to a vibration monitoring device for a wind turbine tower. Background Art

[0002] Structural health assessment, fatigue analysis, and safety warnings for wind turbine towers have always been a challenging issue in this technology field. Wind power, as a clean, renewable energy source, has been widely developed and applied worldwide in recent years. Its basic principle is to use wind power to rotate the blades of the wind turbine, which then converts mechanical energy into electrical energy through the generator. The tower of a wind turbine is the load-bearing component of the wind turbine, primarily providing support and absorbing vibrations. During actual use, vibration monitoring is necessary to ensure safety and prevent vibrations from affecting the wind turbine. With the continuous expansion of wind power installed capacity, tower structural health monitoring has become a key step in ensuring the safe and stable operation of wind farms. Traditional vibration monitoring devices often rely on fixed installations, which present problems such as complex installation, poor versatility, and inconvenient maintenance. Summary of the Invention

[0003] The present invention provides a vibration monitoring device for a wind turbine tower, which includes an arc-shaped piece, a connecting assembly, and a vibration sensor, wherein the connecting assembly includes a spring, a damper, and a connecting plate, the spring is sleeved on the damper, and both ends of the spring and the damper are fixedly connected to the connecting plate; a plurality of arc-shaped pieces are connected end to end into an inward-locking circular ring through the connecting assembly, and at least one vibration sensor is fixed on the inner surface of each inward-locking arc-shaped piece.

[0004] Both ends of the arc-shaped piece are provided with fixing pieces connected with the spring.

[0005] The connecting assembly, a key telescopic adjustment component of the present invention, is installed between two curved pieces. It freely expands and contracts axially, automatically adapting to variations in the inner diameter of the tower's different heights due to manufacturing or design differences. This structure ensures stable connection and effective monitoring even in areas with large tower tapers. The connecting plate securely secures the spring and damper between adjacent curved pieces, preventing loosening caused by high-frequency vibrations caused by wind loads and improving the long-term stability and reliability of the entire monitoring device.

[0006] The curvature and taper of the arc-shaped piece are consistent with the inner wall of the wind turbine tower, ensuring that the inner buckle ring fits tightly with the inner wall of the tower, effectively improving the mechanical transmission efficiency of vibration energy and reducing the risk of structural stress concentration.

[0007] The vibration sensor is a three-axis MEMS accelerometer.

[0008] This device is installed on the inner wall of the wind turbine tower, and the sensors are arranged in symmetrical positions of the arc structure to enhance the sensitivity and accuracy of the acquisition of vibration response signals. The compression of the suspension device adaptively adjusts the diameter of the overall structure to form an array of structural monitoring units that can move up and down. More than one inward-facing circular ring is installed on the inner wall of the wind turbine tower to cover multiple height areas of the tower and enhance the spatial resolution of structural status acquisition.

[0009] In order to adapt to the change in inner diameter caused by the different tapers of the upper and lower sections of the tower, the compression stroke of the connecting component L To meet the change in the inner diameter of the tower (i.e. the travel of the connecting component can meet the change in diameter from the bottom to the top of the tower), the formula can be expressed as:

[0010] Where, R 1 is the inner diameter of the tower bottom; R 2 is the inner diameter of the tower top; n The stroke design ensures that the monitoring device can be flexibly deployed throughout the entire tower height range.

[0011] Compared with traditional vibration monitoring devices, the present invention has the following significant advantages: 1. It can adapt to a variety of tower specifications and diameter changes, and no longer relies on on-site secondary processing or manual adjustment; 2. The inner buckle ring is modular in design and can be quickly disassembled and assembled, greatly reducing construction and maintenance costs; 3. The integrated structural design combined with multi-point high-sensitivity sensors can stably collect high-quality vibration signals over a long period of time; 4. Move the suspension device of the automobile structure to the wind turbine tower vibration monitoring device, and flexibly expand and contract the entire structure through springs and dampers.

[0012] In summary, the wind turbine tower vibration monitoring device provided by the present invention can effectively meet the urgent needs of modern wind power equipment for real-time monitoring of structural safety, high-reliability operation and intelligent remote operation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of the vibration monitoring device for the wind turbine tower; Figure 2 Schematic diagram of the arc-shaped sheet structure; Figure 3 is a structural diagram of the connection components; Figure 4 It is a schematic diagram of the connection status of the connection components; In the figure: 1-arc-shaped piece; 2-connecting assembly; 3-vibration sensor; 4-spring, 5-damper, 6-bolt, 7-connecting plate, 8-fixing piece. DETAILED DESCRIPTION

[0014] To better understand the structure and function of the invention, a specific embodiment of a vibration monitoring device for a wind turbine tower is described in detail below with reference to the accompanying drawings. However, it should be understood that these embodiments are merely preferred embodiments of the invention and do not constitute a limitation on the scope of protection of the invention.

[0015] Example 1: Figure 1-3 As shown, the vibration monitoring device of the wind turbine tower includes an arc piece 1, a connecting component 2, and a vibration sensor 3. The connecting component 2 includes a spring 4, a damper 5, and a connecting plate 7. The spring is sleeved on the damper 5. Both ends of the spring 4 and the damper 5 are fixedly connected to the connecting plate 7; fixed plates 8 connected to the connecting plate 7 are provided at both ends of the arc piece 1. The connecting plate 7 is connected to the fixed plate 8 by bolts 6. Multiple arc pieces 1 are connected end to end through the connecting component 2 to form an inward buckled ring. A vibration sensor 3 is fixed on the inner surface of each inward buckled arc piece 1. The sensor is a three-axis MEMS accelerometer (encapsulated in a sensor module with an IP67 protection grade, supporting wired or wireless signal transmission). The curvature of the arc piece is consistent with the curvature of the inner wall of the wind turbine tower at the installation location and fits tightly with the inner wall of the tower. The spring is a 304 stainless steel compression spring with a rust-proof surface treatment. The damper suppresses the spring residual vibration in the resonant frequency band to avoid sensor signal aliasing. The arc piece is injection molded from glass fiber reinforced polyamide (PA66-GF30), which has excellent strength, corrosion resistance and fatigue resistance.

[0016] When the above device is used, the inner buckle ring is set on the inner wall of the wind turbine tower and fits tightly to ensure large-area contact to efficiently capture the tower vibration energy; the vibration condition is detected by the vibration sensor 3 ( Figure 4 ).

[0017] In this embodiment, the inner diameter of the bottom end of the wind turbine tower inner wall is R1 = 2650mm, the inner diameter of the top end is R2 = 1750mm, the number of arc blocks 1 is 32, the thickness of the arc block is 5mm, and the radius is 2550mm; The compression stroke of the connecting component 2 is 200 mm, which is greater than the result obtained by the formula, that is, the telescopic stroke satisfies the radius change of the inner wall of the tower;

[0018] All components are moved into the tower through the tower door, installed at the bottom of the tower as described above, and then lifted to the required position using the tower's internal hoist according to the required vibration sensor collection position. It is worth noting that the tension of the connecting device is large enough to ensure that the device fits tightly against the inner wall of the tower.

[0019] Monitor the abnormal signals of the tower through vibration sensors and take corresponding measures in time. Example 2: The structure of this example is the same as that of Example 1, and the device is installed in a tower of other models.

Claims

1. A vibration monitoring device for a wind turbine tower, characterized in that: The invention comprises an arc-shaped sheet (1), a connecting assembly (2), and a vibration sensor (3), wherein the connecting assembly comprises a spring (4), a damper (5), and a connecting plate (7), wherein the spring is sleeved on the damper (5), and both ends of the spring (4) and the damper (5) are fixedly connected to the connecting plate (7); a plurality of arc-shaped sheets (1) are connected end to end through the connecting assembly (2) to form an inward-facing circular ring, and at least one vibration sensor (3) is fixed on the inner surface of each inward-facing arc-shaped sheet (1).

2. The vibration monitoring device for a wind turbine tower according to claim 1, characterized in that: Fixed plates (8) connected to the connecting plate (7) are provided at both ends of the arc-shaped plate (1).

3. The vibration monitoring device for a wind turbine tower according to claim 1, characterized in that: The curvature of the arc-shaped piece is consistent with the curvature of the inner wall of the wind turbine tower, and the outer wall of the arc-shaped piece is closely matched with the inner wall of the tower.

4. The vibration monitoring device for a wind turbine tower according to claim 1, characterized in that: The vibration sensor is a three-axis MEMS accelerometer.

5. The vibration monitoring device for a wind turbine tower according to claim 1, characterized in that: One or more inward buckling rings are installed on the inner wall of the wind turbine tower.

6. The vibration monitoring device for a wind turbine tower according to claim 1, characterized in that: The compression stroke L of the connecting component meets the change of the inner wall diameter of the tower: ； Where, R 1 is the inner diameter of the tower bottom, R 2 is the inner diameter of the tower top, n is the number of arc blocks.

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