Application of ultrasonic guided waves for non-destructive testing of large and complex geometry engineering structures

Abstract

The wide group of large engineering constructions made from welded metal components and modern composite materials during daily exploitation under non-stationary loads, continuous influence of vibrations and complicated environmental conditions have demand of periodical tests in order to avoid appearance and evolution of the defects. All of them have one common feature – large areas to be tested and the complex geometry. The objective is to improve air-coupled and contact type testing techniques for excitation and reception of appropriate modes of ultrasonic guided waves in large and complex structures. Also, to develop inspection techniques which enable to detect required types of internal defects. The air-coupled and contact ultrasonic techniques for investigation of large and complex geometry objects, such as composites for aerospace applications and petroleum tanks, have been developed. The investigation of propagation effects of ultrasonic guided (Lamb) waves in the plates of the tank floor has indicated relation between reconstructed properties of guided waves and expected presence of corrosion deposits.

Ultrasonic and phased-array inspection in titanium-based alloys: A review

“…The research on propagation of ultrasonic guided (Lamb) waves manifested a relation between characteristics of guided waves and the anticipated existence of corrosion species. To this end, Raišutis et al 108 investigated the curved surface of the helicopter blade as schematically illustrated in Figure 14(a) via Lamb waves. Moreover, the ultrasonic B-scan figure of the area between the titanium and carbon fiber reinforced plastic (CFRP) skin was represented in Figure 14(b).…”

Wind Turbine Condition Monitoring: State-of-the-Art Review, New Trends, and Future Challenges

“…This method relies on elastic wave propagation and reflection within the material. Three different techniques can be used for this investigation: pulse-echo (Figure 11), through transmission, and pitch-catch [100,101]. Laser interferometric sensors, air-coupled transducers, electromagnetic acoustic transducers, or contact transducers are a subset of the sensors that can be used as the scanning sensor for acoustic wave field imaging, which is another UTT [72,102].…”

“…Implementation of UTTs implies one or more of the following measurements: time of flight or delay, path length, frequency, phase angle, amplitude, acoustic impedance, and angle of wave deflection [104]. Thus, signal-processing algorithms, including such time-frequency techniques as the Wigner-Ville distribution, Hilbert-Huang transform, and wavelet transform [100,105], can be used to extract additional information on internal defects.…”

Crack orientation recognition method based on prototype learning

“…The method in this paper is based on two widely recognized and rapidly developing technologies: ultrasonic guided wave detection technology and deep learning method. Ultrasonic guided wave can realize long-distance detection of the pipeline through a detection point, and can achieve full coverage of the tested area, while realizing the detection of the external surface, internal surface and internal defects of the pipe wall [9][10][11]. Compared with the above-mentioned small-area detection methods, the ultrasonic guided wave detection method greatly improves the detection efficiency.…”