Browse > Article

The Theoretical Investigation of Phased Array Guided Waves  

Lee, Jae-Sun (School of Mechanical Engineering, Pusan National University)
Cho, Youn-Ho (School of Mechanical Engineering, Pusan National University)
Achenbach, Jan D. (Northwestern University Civil, Mechanical engineering)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.31, no.4, 2011 , pp. 367-373 More about this Journal
Abstract
Guided waves inspection techniques that are different with inspection technique by bulk waves are widely used in pipe line evaluation due to advantages of long distance inspection. However, most of pipe lines at industrial fields are buried and/or coated. In this case, due to the attenuation effect from soil and/or coating material, there are a lot of difficulty on inspection by conventional ultrasonic technique. In this paper, guided waves propagating patterns are calculated with respect to excitation mode by Normal Mode Expansion(NME). Guided waves patterns based on excited by single transducer and guided wave focusing technique have employed to analyze focusing pattern on a pipe. A longitudinal mode and high order flexural modes are used with various number of transducers to determine sensitivity. Guided waves energy excited by multi transducer with focusing algorithm was successfully focused at a desired point.
Keywords
Guided Waves; Normal Mode Expansion; Focusing Technique; Pipe Inspection;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Y. Cho, H.-S. Ham and H. H. Choi, "Thickness assessment of adhesive layer in inhomogeneous layer by guided wave," Journal of the Korean Society for Nondestructive Testing, Vol. 21, No. 4, pp. 391-397 (2001)
2 Y. Cho, D. Kim, H. Choi and J. Lee, "Evaluation of composite laminates for aircraft primary-structure applications using nonlinear parameter of ultrasonic guided wave," Journal of the Korean Society for Nondestructive Testing, Vol. 30, No. 2, pp. 126-131 (2010)
3 D. C. Gazis, "Three dimensional investigation of the propagation of waves in hollow circular cylinders. I. Analytical foundation," J. Acoust. Soc. Am., Vol. 31, pp. 568-573 (1959)   DOI
4 D. C. Gazis, "Three dimensional investigation of the propagation of waves in hollow circular cylinders. II. Analytical foundation," J. Acoust. Soc. Am., Vol. 31, pp. 573-578 (1959)   DOI
5 J. L. Rose, "Ultrasonic Waves in Solid Media," Cambridge University Press, Cambridge, UK, (1999)
6 J. J. Ditri and J. L. Rose, "Excitation of guided wave modes in hollow cylinders by applied surface tractions," J. Appl. Phys., Vol. 72, No. 7, pp. 2589-2597 (1992)   DOI
7 J. Li and J. L. Rose, "Excitation and propagation of non-axisymmetric guided waves in a hollow cylinder," J. Acoust. Soc. Am., Vol. 109, No. 2, pp. 457-464 (2001)   DOI   ScienceOn
8 J. Li and J. L. Rose, "Natural beam focusing of non-axisymmetric guided waves in large diameter pipes," Ultrasonics, Vol. 44, pp. 35-45 (2006)   DOI   ScienceOn
9 Jan D. Achenbach, "Wave Propagation in Elastic Solids," North-holland Publishing Company, Oxford, UK, (1975)