Research on the Nondestructive Detection of Ultrasonic Guided Wave Based on the Time Reversal Method

2013 ◽  
Vol 330 ◽  
pp. 996-1002
Author(s):  
Wen Chao Lv ◽  
Shao Ping Zhou ◽  
Ai Qiang Cui
Keyword(s):  
Time Reversal ◽  
Guided Waves ◽  
Guided Wave ◽  
Ultrasonic Guided Waves ◽  
Wave Method ◽  
Defect Identification ◽  
Ultrasonic Guided Wave ◽  
Wave Technique ◽  
Defects Identification ◽  
Initial Results

Because there are many mode transformations when the ultrasonic guided waves run into defects in the pipeline, the reflected signals got by means of the traditional ultrasonic guided wave technique are complex and the amplitudes are small. The time reversal method is a way to intercept the reflected signals in the initial results with a certain bandwidth and excite the time reversal guided waves on the corresponding nodes. In this way, energies of the guided wave are focused in time and space. By comparing the accuracy of defects identification in the straight pipes and the bent pipes with the traditional ultrasonic guided wave method and the time reversal method, this paper proves that the time reversal method has many advantages over the tradition ultrasonic guided wave method. The time reversal method overcomes disadvantages of the traditional guided wave technique and improves the identification degree and accuracy of defects effectively. It lays the foundation for the final defect identification.

Time Reversal Technique for Ultrasonic Guided Wave Inspection

2006 ◽  
Vol 321-323 ◽  
pp. 776-779
Author(s):  
Hak Joon Kim ◽  
Sung Jin Song ◽  
Jung Ho Seo ◽  
Jae Hee Kim ◽  
Heung Seop Eom
Keyword(s):  
Time Delay ◽  
Power Plant ◽  
Time Reversal ◽  
Nuclear Power ◽  
Guided Waves ◽  
Performance Enhancement ◽  
Guided Wave ◽  
Ultrasonic Waves ◽  
Ultrasonic Guided Waves ◽  
Ultrasonic Guided Wave

For the long range inspection of structures in nuclear power plant using array transducers, it is necessary to focus waves on defects under interrogation. To take care of such a need, in this study we adopt a time reversal technique that is claimed to be very robust to focus ultrasonic waves on defects. Specifically, we calculate the appropriate time delay using the time reversal technique and re-generate ultrasonic guided waves that are focusing to an interrogated defect with the calculated time delay. In this paper, we describe the principle of the time reversal technique briefly and present the performance enhancement obtained by the time reversal techniques.

scholarly journals Numerical Study on Ultrasonic Guided Waves for the Inspection of Polygonal Drill Pipes

Sensors ◽  
2019 ◽  
Vol 19 (9) ◽  
pp. 2128 ◽  
Author(s):  
Xiang Wan ◽  
Xuhui Zhang ◽  
Hongwei Fan ◽  
Peter W. Tse ◽  
Ming Dong ◽  
...  
Keyword(s):  
Guided Waves ◽  
Numerical Study ◽  
Drill Pipe ◽  
Ultrasonic Inspection ◽  
Guided Wave ◽  
Ultrasonic Guided Waves ◽  
Inspection Method ◽  
Ultrasonic Guided Wave ◽  
Wave Technique ◽  
Drill Pipes

The polygonal drill pipe is one of the most critical yet weakest part in a high-torque drill machine. The inspection of a polygonal drill pipe to avoid its failure and thus to ensure safe operation of the drilling machine is of great importance. However, the current most frequently used ultrasonic inspection method is time-consuming and inefficient when dealing with a polygonal drill pipe, which is normally up to several meters. There is an urgent need to develop an efficient method to inspect polygonal drill pipes. In this paper, an ultrasonic guided wave technique is proposed to inspect polygonal drill pipes. Dispersion curves of polygonal drill pipes are firstly derived by using the semi-analytical finite element method. The ALID (absorbing layer using increasing damping) technique is applied to eliminate unwanted boundary reflections. The propagation characteristics of ultrasonic guided waves in normal, symmetrically damaged, and asymmetrically damaged polygonal drill pipes are studied. The results have shown that the ultrasonic guided wave technique is a promising and effective method for the inspection of polygonal drill pipes.

Ultrasonic Guided Wave Testing of Finned Tubing

2015 ◽  
Author(s):  
Owen M. Malinowski ◽  
Matthew S. Lindsey ◽  
Jason K. Van Velsor
Keyword(s):  
Wave Propagation ◽  
Guided Waves ◽  
Tube Wall ◽  
Guided Wave ◽  
Ultrasonic Guided Waves ◽  
Complex Nature ◽  
Inspection Method ◽  
Ultrasonic Guided Wave ◽  
Guided Wave Propagation ◽  
Wave Modes

In the past few decades, ultrasonic guided waves have been utilized more frequently Non-Destructive Testing (NDT); most notably, in the qualitative screening of buried piping. However, only a fraction of their potential applications in NDT have been fully realized. This is due, in part, to their complex nature, as well as the high level of expertise required to understand and utilize their propagation characteristics. The mode/frequency combinations that can be generated in a particular structure depend on geometry and material properties and are represented by the so-called dispersion curves. Although extensive research has been done in ultrasonic guided wave propagation in various geometries and materials, the treatment of ultrasonic guided wave propagation in periodic structures has received little attention. In this paper, academic aspects of ultrasonic guided wave propagation in structures with periodicity in the wave vector direction are investigated, with the practical purpose of developing an ultrasonic guided wave based inspection technique for finned tubing. Theoretical, numerical, and experimental methods are employed. The results of this investigation show excellent agreement between theory, numerical modeling, and experimentation; all of which indicate that ultrasonic guided waves will propagate coherently in finned tube only if the proper wave modes and frequencies are selected. It is shown that the frequencies at which propagating wave modes exist can be predicted theoretically and numerically, and depend strongly on the fin geometry. Furthermore, the results show that these propagating wave modes are capable of screening for and identifying the axial location of damage in the tube wall, as well as separation of the fins from the tube wall. The conclusion drawn from these results is that Guided Wave Testing (GWT) is a viable inspection method for screening finned tubing.

scholarly journals Excitation and Propagation of Longitudinal L (0, 2) Mode Ultrasonic Guided Waves for the Detection of Damages in Hexagonal Pipes: Numerical and Experimental Studies

2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Xiang Wan ◽  
Meiru Liu ◽  
Xuhui Zhang ◽  
Hongwei Fan ◽  
Qinghua Mao ◽  
...  
Keyword(s):  
Guided Waves ◽  
Experimental Studies ◽  
Special Kind ◽  
Dispersion Curves ◽  
Guided Wave ◽  
Ultrasonic Guided Waves ◽  
Resource Exploitation ◽  
Ultrasonic Guided Wave ◽  
Study Results ◽  
Through Hole

The hexagonal pipe is a special kind of tube structure. Its inner surface of the cross section is in the shape of circle, while the outer surface is hexagonal. It has functioned as an essential and critical part of a drill stem in a high-torque drill machine used in various resource exploitation fields. The inspection of a hexagonal pipe to avoid its failure and thus to ensure safe operation of a drilling machine is becoming increasingly urgent and important. In this study, the excitation and propagation of ultrasonic guided waves for the purpose of detecting defects in hexagonal pipes are proposed. Dispersion curves of hexagonal pipes are firstly derived by using semianalytical finite element method. Based on these dispersion curves, longitudinal L (0, 2) mode at 100 kHz is selected to inspect hexagonal pipes. A ring of piezoelectric transducers (PZTs) with the size of 25 mm × 5 mm ×0.5 mm is able to maximize the amplitude of L (0, 2) mode and successfully suppress the undesired L (0, 1) mode in the experiments. Numerical and experimental studies have shown that the displacement field of L (0, 2) mode at 100 kHz is almost uniformly distributed along the circumferential direction. Furthermore, L (0, 2) mode ultrasonic guided waves at 100 kHz are capable of detecting circular through-hole damages located in the plane and near the edge in a hexagonal pipe. Our study results have demonstrated that the use of longitudinal L (0, 2) mode ultrasonic guided wave provides a promising and effective alternative for the detection of defects in hexagonal pipe structures.

The Application of Ultrasonic Guided Waves in the Furnace Tube Inspection

2013 ◽  
Author(s):  
Li Xia ◽  
Yufeng Ye ◽  
Xianggang Wang
Keyword(s):  
Wall Thickness ◽  
Guided Waves ◽  
Thickness Measurement ◽  
Guided Wave ◽  
Ultrasonic Guided Waves ◽  
Security Risks ◽  
Tube Wall Thickness ◽  
Ultrasonic Guided Wave ◽  
Furnace Tube ◽  
Crude Oil Distillation

According to the problem of the conventional thickness measurement method used to measure the furnace wall thinning in petrochemical industry, proposed a new NDT named guided wave to detect the presence of the wall thickness. Use of the technique for detection of dangerous parts of the refinery furnace tube, take the coker furnace and the furnace of crude oil distillation unit guided wave inspection application for Example, and through analysis of test data and field-proven and found many security risks, and guide the user to process. It concluded that the ultrasonic guided wave technology can effective realization radiation section of the furnace tube wall thickness detection.

A Non-Contact Guided Wave Technique for Defect Thinning Monitoring

2006 ◽  
Vol 326-328 ◽  
pp. 681-684 ◽  
Author(s):  
Ik Keun Park ◽  
Yong Kwon Kim ◽  
Tae Hyung Kim ◽  
Yong Sang Cho
Keyword(s):  
Guided Waves ◽  
Guided Wave ◽  
Velocity Change ◽  
Accelerated Corrosion ◽  
Ultrasonic Guided Wave ◽  
Acoustic Transducer ◽  
Thin Aluminum ◽  
Wave Technique ◽  
Electro Magnetic ◽  
Flow Accelerated Corrosion

This paper capitalizes on recent advances in the area of non-contact ultrasonic guided wave techniques. The present technique provides a decent method for nondestructive testing of defect thinning simulating a hidden corrosion or FAC(Flow Accelerated Corrosion) in a thin aluminum plate. The proposed approach is based on using EMAT(Electro-magnetic Acoustic Transducer) to generate guided waves and detect the wall thinning without any coupling. Interesting features in the dispersive behavior of selected guided modes are used for the detection of plate thinning. It is shown that mode cut-off measurement allows us to monitor a defect thinning level while a group velocity change can be used to quantify the thinning depth.

Inspection of Buried Gas Pipeline Using Ultrasonic Guided Waves

2008 ◽  
Author(s):  
Yao Wei ◽  
Weibin Wang ◽  
Yuqin Wang ◽  
Guichun Liu ◽  
Guangwen Liu ◽  
...  
Keyword(s):  
Guided Waves ◽  
Guided Wave ◽  
Gas Pipeline ◽  
Ultrasonic Guided Waves ◽  
Buried Pipelines ◽  
Comparison Result ◽  
Ultrasonic Guided Wave ◽  
Gas Station ◽  
Buried Gas Pipeline

Ultrasonic Guided Wave testing is now widely used for the inspection of buried pipelines. The principle, characteristics and application of the inspection were introduced. As an example, pipelines in gas station were tested on-site and the reliability of testing results was verified by excavation. A comparison result showed that the ultrasonic guided waves can make it reality to test on site quickly, and has wide prospect.

Study on Ultrasonic Guided Waves in Fluid-Filled Pipes Surrounded by Water

2006 ◽  
Author(s):  
Shijiu Jin ◽  
Liying Sun ◽  
Guichun Liu ◽  
Yibo Li ◽  
Hong Zhang
Keyword(s):  
Guided Waves ◽  
Guided Wave ◽  
Ultrasonic Waves ◽  
Ultrasonic Guided Waves ◽  
Fluid Loading ◽  
Inspection Method ◽  
Ultrasonic Guided Wave ◽  
Oil Company ◽  
Non Destructive ◽  
Good Agreement

A new non-destructive pipe inspection method, ultrasonic guided wave method as well as the comparison between ultrasonics and guided waves is introduced. An investigation of the guided ultrasonic waves traveling along pipes with fluid loading on the inside and outside of the pipe is described. The effect of inner and outer media has been researched by considering a steel pipe with air and water inside and outside the experimental pipe. Site experiment was carried out on a heating pipe in the resident area of Bohai Oil Company, China. A typical cylindrical guided wave, longitudinal guided wave was used to examine pipes with artificial defects and its propagation characteristics along the pipe were studied. Good agreement has been obtained between the experiments and predictions for pipes with different loading on the pipe.

scholarly journals Ultrasonic Guided Waves in Piezoelectric Layered Composite with Different Interfacial Properties

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Xiao Chen
Keyword(s):  
Guided Waves ◽  
Interfacial Properties ◽  
Layered Composite ◽  
Guided Wave ◽  
Propagation Model ◽  
Ultrasonic Guided Waves ◽  
Piezoelectric Composite ◽  
Order Mode ◽  
Ultrasonic Guided Wave ◽  
Different Depths

Combining the propagation model of guided waves in a multilayered piezoelectric composite with the interfacial model of rigid, slip, and weak interfaces, the generalized dispersion characteristic equations of guided waves propagating in a piezoelectric layered composite with different interfacial properties are derived. The effects of the slip, weak, and delamination interfaces in different depths on the dispersion properties of the lowest-order mode ultrasonic guided wave are analyzed. The theory would be used to characterize the interfacial properties of piezoelectric layered composite nondestructively.

Ultrasonic Guided Wave Monitoring of Railroad Tracks

2012 ◽  
Vol 83 ◽  
pp. 198-207 ◽  
Author(s):  
Claudio Nucera ◽  
Robert Phillips ◽  
Francesco Lanza di Scalea
Keyword(s):  
Guided Waves ◽  
Thermal Stresses ◽  
Flaw Detection ◽  
Guided Wave ◽  
Ultrasonic Guided Waves ◽  
Rail Transportation ◽  
Railroad Tracks ◽  
Ultrasonic Guided Wave ◽  
The Us ◽  
Inspection Systems

Among structural concerns for the safety of rail transportation are internal flaws and thermal stresses, both of which can cause disruption of service and even derailments. Ultrasonic guided waves lend themselves to addressing both of these problems. This paper reports on two inspection systems for rails being developed at UCSD under the auspices of the US Federal Railroad Administration. Both systems utilize ultrasonic guided waves as the main probing mechanism, for the two different applications of flaw detection and thermal stress detection.

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