Wind power blade three-dimensional damage positioning method based on acoustic emission signals
By placing multiple probes on the surface of the wind power blades, and using the time difference and propagation speed of the acoustic emission signals to calculate the damage position, the problem of unattended positioning of the wind power blades is solved, and efficient and accurate damage identification and positioning is achieved.
Patent Information
- Application Number
- CN202510676099.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-24
- Publication Date
- 2025-08-08
AI Technical Summary
The prior art is difficult to realize all-weather, unattended three-dimensional damage identification and positioning of wind power blades. The traditional detection methods are inefficient and highly subjective, making it difficult to detect early tiny defects in a timely manner.
Using acoustic emission signals, a method is used to place multiple probes on different surfaces of wind power blades, and a stereoscopic damage position is achieved by placing signal propagation time difference, and the damage position is calculated based on the sound wave propagation speed and probe coordinates.
It realizes all-weather, real-time, and high-sensitivity damage positioning of wind power blades, can detect small defects in a timely manner, and improves detection efficiency and accuracy.
Smart Images
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Abstract
Description
Technical Field
[0001] The present invention belongs to the field of health monitoring and defect detection of wind turbine blades, and in particular relates to a three-dimensional damage positioning method for wind turbine blades based on acoustic emission signals. Background Art
[0002] With the global emphasis on environmental protection and sustainable development, the demand for renewable energy continues to increase. As a clean and renewable energy source, wind energy has gradually increased its share in the energy structure. As a key component of wind turbines, the performance of wind turbine blades directly affects the efficiency and reliability of wind power generation. Wind turbine blades are usually made of composite materials (such as glass fiber reinforced composite materials, carbon fiber reinforced composite materials, etc.). These materials have high strength, low density and good fatigue resistance. Wind turbine blades have complex structures and are easily affected by wind, temperature changes, humidity, ultraviolet rays and other factors in the external environment, which can lead to potential defects such as fiber breakage, interlayer debonding, and cracks. For the monitoring of wind turbine blade damage, traditional manual detection methods (such as visual inspection, tapping test, etc.) have the problems of low efficiency and strong subjectivity, and it is difficult to detect early minor defects in time. Therefore, there is an urgent need for a technology that can realize all-weather, unmanned three-dimensional damage identification and positioning of wind turbine blades.
[0003] Acoustic emission technology installs sensors on the surface of the blade, eliminating the need to touch the inside of the blade and thus preventing damage. This technology can monitor the dynamic changes of the blade during operation in real time, facilitating the timely detection of new defects. At the same time, it has a high sensitivity to minor defects (such as crack initiation and delamination), enabling early detection and early warning of defects. By placing multiple probes on different surfaces of wind turbine blades and analyzing the signals from multiple sensors, combined with signal propagation time and wave velocity, it is possible to achieve all-weather, unattended, three-dimensional damage identification and positioning for wind turbine blades. Summary of the Invention
[0004] Aiming at wind turbine blade health monitoring and defect detection, the present invention provides a three-dimensional wind turbine blade damage location method based on acoustic emission signals. This method uses acoustic emission instruments to achieve all-weather, real-time damage monitoring.
[0005] In order to achieve the above-mentioned object of the invention, the specific technical solutions of the present invention are as follows:
[0006] The acoustic emission system consists of eight parts, including a dedicated computer for acoustic emission, acoustic emission instrument, amplifier, probe, USB3.0 connecting cable, sensor signal transmission line, and probe cable;
[0007] The types of damage that can be monitored include: fracture, slip, interface debonding, hole defects, fatigue damage, thermal damage, corrosion damage, and wear damage;
[0008] The positioning method is as follows:
[0009] Multiple probes are placed on different surfaces of the wind turbine blade. Different probes receive the acoustic emission signals of the same damage, and three-dimensional damage positioning is achieved through the time difference between the acoustic emission signals received by different probes.
[0010] The coordinates of the four probes are P1 = (x1, y1, z1), P2 = (x2, y2, z2), P3 = (x3, y3, z3), and P4 = (x4, y4, z4). P1 and P2 are on the same surface of the wind turbine blade, while P3 and P4 are located on two separate surfaces. The coordinates of the sound source are (x, y, z), the propagation speed of the sound wave is v, and the time it takes for the signal to reach the four probes is t1, t2, t3, and t4, respectively. Based on the relationship between the propagation time and distance of the sound wave, the following equations can be derived:
[0011]
[0012] Among them, t0 is the absolute time when the sound source makes the sound.
[0013] To eliminate t0, we can subtract the above equations from each other to obtain the following system of equations:
[0014]
[0015] Based on the above formulas, the three-dimensional spatial coordinates of the sound source can be accurately derived, which can achieve accurate positioning of the damaged position of the wind turbine blade.
[0016] Beneficial effects
[0017] The damage location method using acoustic emission in the present invention has the advantages of real-time, high sensitivity, high positioning accuracy and monitoring. Acoustic emission positioning achieves the purpose of all-weather, real-time monitoring of damage, and provides a practical three-dimensional damage location method for detecting damage to wind turbine blades. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 Schematic diagram of using acoustic emission to achieve three-dimensional damage location on wind turbine blades.
[0019] Figure 2 This is the connection diagram of the acoustic emission equipment.
[0020] In the figure, 1. Probe position; 2. Fracture signal position. DETAILED DESCRIPTION
[0021] The following is a detailed description of an embodiment of the present invention. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process. However, the protection scope of the present invention is not limited to the following embodiment.
[0022] Example 1
[0023] Four or more probes are used on wind turbine blades, with two probes placed on one surface and one probe placed on each of the other two surfaces. The break signal is simulated with the broken lead signal, and the time difference between the acoustic emission signals reaching different sensors is measured to determine the location of the sound source, thereby achieving precise positioning of the damage signal.
[0024] Figure 1 This is a schematic diagram of three-dimensional damage location on a wind turbine blade using acoustic emission. The damage location diagram includes the position of the probe and the position of the broken lead.
Claims
1. A three-dimensional damage location method for wind turbine blades based on acoustic emission signals, characterized in that: Acoustic emission signals are used to locate three-dimensional damage on wind turbine blades.
2. The wind turbine blade three-dimensional damage positioning method according to claim 1, characterized in that: The equipment required includes: a computer dedicated to acoustic emission (1), an acoustic emission instrument (2), an amplifier (3), a probe (4), a USB 3.0 connecting line (5), a sensor signal transmission line (6), and a probe cable (7).
3. The method for locating three-dimensional damage of a wind turbine blade according to claim 1, characterized in that: Damage types include: fracture, slip, interface debonding, hole defects, fatigue damage, thermal damage, corrosion damage, and wear damage.
4. The method for locating three-dimensional damage of a wind turbine blade according to claim 1, characterized in that: The positioning method is to place multiple probes on different surfaces of the wind turbine blade and use the time difference between the acoustic emission signals received by different probes to achieve three-dimensional damage positioning.