Wind Power Network News: Wind energy is a kind of renewable energy. In recent years, with the improvement of wind energy stability and the further reduction of the cost of wind power blades, this green energy has developed rapidly. The wind power blade is the core part of the wind power system. Its rotation can convert the kinetic energy of the wind into usable energy. Wind turbine blades are generally made of carbon fiber or glass fiber reinforced composite materials. Defects and damages will inevitably occur during production and use. Therefore, whether it is quality inspection during production or tracking inspection during use, it appears to be very important. Non-destructive testing technology and wind power quality testing technology have also become very important technologies in the production and use of wind power blades.
1 Common defects of wind power blades
Defects generated during the production of wind turbine blades may change during the normal operation of the subsequent wind system, causing quality problems. The most common defects are tiny cracks on the blade (usually generated at the edge, top or tip of the blade). ). The cause of the cracks mainly comes from defects in the production process, such as delamination, which usually occur in areas with imperfect resin filling. Other defects include surface degumming, delamination of the main beam area and some pore structures inside the material, etc.
2Traditional non-destructive testing technology
2.1 Visual inspection
Visual inspection is widely used in the inspection of large-scale structural materials on space shuttles or bridges. Because the size of these structural materials is very large, the time required for visual inspection will be relatively long, and the accuracy of the inspection also depends on the experience of the inspector. Because some materials belong to the field of “high-altitude operations”, the work of inspectors is highly dangerous. In the inspection process, the inspector will generally be equipped with a long-lens digital camera, but the long-term inspection process will cause eye fatigue. Visual inspection can directly detect the defects on the surface of the material, but the defects of the internal structure cannot be detected. Therefore, other effective methods are needed to evaluate the internal structure of the material.
2.2 Ultrasonic and acoustic testing technology
Ultrasonic and sonic nondestructive testing technology is the most commonly used wind turbine blade testing technology, which can be subdivided into ultrasonic echo, air-coupled ultrasonic, laser ultrasonic, real-time resonance spectroscopy technology, and acoustic emission technology. So far, these technologies have been used for wind turbine blade inspection.
Post time: Nov-17-2021
