Angular-profile tuning of guided waves in hollow cylinders using a circumferential phased array

2002 ◽  
Vol 49 (12) ◽  
pp. 1720-1729 ◽  
Author(s):  
J. Li ◽  
J.L. Rose
Keyword(s):  
Guided Waves ◽  
Phased Array ◽  
Hollow Cylinders

Guided Waves in Hollow Cylinders: Theoretical and Numerical Study

2021 ◽  
pp. 295-303
Author(s):  
Quang Hung Le ◽  
Yen Nguyen ◽  
Hoai Nguyen ◽  
Duy Kien Dao ◽  
Hoai-Nam Tran ◽  
...  
Keyword(s):  
Guided Waves ◽  
Numerical Study ◽  
Hollow Cylinders

scholarly journals Non-Contact Quantification of Longitudinal and Circumferential Defects in Pipes using the Surface Response to Excitation (SuRE) Method

2020 ◽  
Vol 8 (2) ◽  
Author(s):  
Amin Baghalian ◽  
Shervin Tashakori ◽  
Volkan Y. Senyurek ◽  
Dwayne McDaniel ◽  
Hadi Fekrmandi ◽  
...  
Keyword(s):  
Guided Waves ◽  
Oil And Gas ◽  
Mode Selection ◽  
Rapid Screening ◽  
Successful Implementation ◽  
Cylindrical Structures ◽  
Surface Response ◽  
Damage Quantification ◽  
Hollow Cylinders ◽  
Circumferential Defects

Rapid screening and monitoring of hollow cylindrical structures using active guided-waves based structural health monitoring (SHM) techniques are important in chemical, petro-chemical, oil and gas industries. Successful implementation of the majority of these techniques in the SHM of pipes depends on the identification of the appropriate guided-waves modes and their frequencies for each application. The highly dispersive nature of the guided-waves and presence of multi modes at each frequency makes the mode selection and the interpretation of signals a challenging task. The surface response to excitation (SuRE) method was developed to detect the defects and loading condition changes on plates with minimum dependence on the excitation of particular modes at certain frequencies. In the present study, the SuRE method is proposed for quantification of longitudinal and circumferential defects, with varying severities, as common examples of axisymmetric and nonaxisymmetric defects in pipes. The results indicate that the SuRE method can be used effectively for damage quantification in hollow cylinders.

scholarly journals Numerical Investigation of Excitation of Various Lamb Waves Modes in Thin Plastic Films

2022 ◽  
Vol 12 (2) ◽  
pp. 849
Author(s):  
Rymantas Jonas Kazys ◽  
Justina Sestoke ◽  
Egidijus Zukauskas
Keyword(s):  
Numerical Investigation ◽  
Lamb Wave ◽  
Guided Waves ◽  
Phased Array ◽  
Ultrasonic Transducer ◽  
Guided Wave ◽  
Ultrasonic Guided Waves ◽  
Plastic Films ◽  
Thin Plastic ◽  
Wave Modes

Ultrasonic-guided waves are widely used for the non-destructive testing and material characterization of plates and thin films. In the case of thin plastic polyvinyl chloride (PVC), films up to 3.2 MHz with only two Lamb wave modes, antisymmetrical A0 and symmetrical S0, may propagate. At frequencies lower that 240 kHz, the velocity of the A0 mode becomes slower than the ultrasonic velocity in air which makes excitation and reception of such mode complicated. For excitation of both modes, we propose instead a single air-coupled ultrasonic transducer to use linear air-coupled arrays, which can be electronically readjusted to optimally excite and receive the A0 and S0 guided wave modes. The objective of this article was the numerical investigation of feasibility to excite different types of ultrasonic-guided waves, such as S0 and A0 modes in thin plastic films with the same electronically readjusted linear phased array. Three-dimensional and two-dimensional simulations of A0 and S0 Lamb wave modes using a single ultrasonic transducer and a linear phased array were performed. The obtained results clearly demonstrate feasibility to excite efficiently different guided wave modes in thin plastic films with readjusted phased array.

Source Influence for Focusing Potential of Guided Waves in Hollow Cylinders by Using a Circumferential Phased Array

2004 ◽  
Author(s):  
Li Zhang ◽  
Brian J. Gavigan ◽  
Joseph L. Rose
Keyword(s):  
Time Delays ◽  
Nuclear Power ◽  
Guided Waves ◽  
Phased Array ◽  
Angular Displacement ◽  
Excitation Source ◽  
Natural Gas Pipelines ◽  
Contour Plots ◽  
Array Position ◽  
Steam Pipes

The phased array focusing technique is being developed with the intent to inspect hundreds of feet of pipeline from a single array position. The single array position is beneficial if access to a pipe is limited, e.g. steam pipes onboard U.S. Naval ships, nuclear power plant pipes, oil and natural gas pipelines. The steam pipes have a protective coating which would ordinarily be removed and replaced for an inspection. From a single array position, ultrasonic guided waves propagate under the coating, down the length of the pipe and return information about potential defects. Focusing the ultrasonic energy at a predetermined location along the length of the pipe enhances the ability to detect defects that current state of the art inspection systems cannot. Focusing is achieved by applying excitation time delays to a multi-channel signal generation system. The excitation sources are equally spaced about the circumference of the pipe. Time delays are calculated using theoretically generated angular displacement profiles in a hollow cylinder. These theoretical displacement profiles are dependent upon excitation source influences. In this paper, the excitation source influence on focusing potential in pipe was studied. Further, focusing potential contour plots for different frequencies and distances from the excitation source were created. Based on the contour plots, sample focusing experiments were carried out.

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