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Synthetic Phase Tuning Technique for the Transduction of a Specific Ultrasonic Torsional Mode in a Pipe

배관에서의 특정 비틀림 초음파 모드 송수신을 위한 합성 위상 조절 기법

  • Kim, Hoe Woong (Fast Reactor Technology Demonstration Division, Korea Atomic Energy Research Institute) ;
  • Kwon, Young Eui (School of Mechanical and Aerospace Engineering, Seoul National University) ;
  • Joo, Young Sang (Fast Reactor Technology Demonstration Division, Korea Atomic Energy Research Institute) ;
  • Kim, Jong Bum (Fast Reactor Technology Demonstration Division, Korea Atomic Energy Research Institute) ;
  • Kim, Yoon Young (School of Mechanical and Aerospace Engineering, Seoul National University)
  • Received : 2012.12.07
  • Accepted : 2013.01.23
  • Published : 2013.03.20

Abstract

This study newly presents a synthetic phase tuning technique to suppress the unwanted torsional mode while enhancing the desired torsional mode in a pipe. Specifically, we aim at the enhancement of the first torsional mode and the suppression of the undesired, second torsional mode. Earlier efforts were to enhance the desired wave mode only in the hope that the enhancement results in the suppression of the unwanted wave mode. Unlike these efforts, the suggested technique makes the complete cancellation of the unwanted wave mode but it is shown to enhance the desired first mode for torsional wave problems. In the present study, the synthetic phase tuning is developed for the cancellation of the unwanted wave mode, meaning that the number of necessary experimental equipments is reduced. Simulation and experiment were carried out to check the effectiveness of the proposed method. As an application of the suggested technique, we investigated the reflection and mode conversion characteristics of the first torsional mode according to the step thickness variation in a stepped pipe.

Keywords

References

  1. Ditri, J. J., 1994, Utilization of Guided Elastic Waves for the Characterization of Circumferential Cracks in Hollow Cylinders, Journal of the Acoustical Society of America, Vol. 96, No. 6, pp. 3769-3775. https://doi.org/10.1121/1.410565
  2. Lowe, M. J. S., Alleyne, D. N. and Cawley, P., 1998, Defect Detection in Pipes Using Guided Waves, Ultrasonics, Vol. 36, No. 1-5, pp. 147-154. https://doi.org/10.1016/S0041-624X(97)00038-3
  3. Demma, A., Cawley, P., Lowe, M., Roosenbrand, A. G. and Pavlakovic, B., 2004, The Reflection of Guided Waves from Notches in Pipes: A Guide for Interpreting Corrosion Measurements, NDT & E International, Vol. 37, No. 3, pp. 167-180. https://doi.org/10.1016/j.ndteint.2003.09.004
  4. Graff, K. F., 1991, Wave Motion in Elastic Solids, Dover Publications, NewYork.
  5. Rose, J. L., Pelts, S. P. and Quarry, M. J., 1998, A Comb Transducer Model for Guided Wave NDE, Ultrasonics, Vol. 36, No. 1-5, pp. 163-169. https://doi.org/10.1016/S0041-624X(97)00042-5
  6. Hay, T. R. and Rose, J. L., 2002, Flexible PVDF Comb Transducers for Excitation of Axisymmetric Guided Waves in Pipe, Sensors and Actuators, A, Vol. 100, No. 1, pp. 18-23. https://doi.org/10.1016/S0924-4247(02)00044-4
  7. Li, J. and Rose, J. L., 2001, Implementing Guided Wave Mode Control by Use of a Phased Transducer Array, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, Vol. 48, No. 3, pp. 761-768. https://doi.org/10.1109/58.920708
  8. Cawley, P., Alleyne, D. N. and Chan, C. W., 2000, Inspection of Pipes, U.S. Patent 6148672.
  9. Alleyne, D. N., Pavlakovic, B., Lowe, M. J. S. and Cawley, P., 2001, Rapid Long-range Inspection of Chemical Plant Pipework Using Guided Waves, Insight, Vol. 43, No. 2, pp. 93-96.
  10. Kim, H. W., Kwon, Y. E., Lee, J. K. and Kim, Y. Y., Higher Torsional Mode Suppression in a Pipe for Enhancing the First Torsional Mode by Using Magnetostrictive Patch Transducers, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control(accepted).
  11. Wooh, S. and Shi, Y., 2001, Synthetic Phase Tuning of Guided Waves, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, Vol. 48, No. 1, pp. 209-223. https://doi.org/10.1109/58.896134
  12. Pavlakovic, B. and Lowe, M., 2003, Disperse User Manual: a System for Generating Dispersion Curves, Imperial College, University of London.
  13. Comsol Muliphysics, COMSOL Multiphysics Modeling Guide : Version3.5 (COMSOLAB, Stockholm, 2008).
  14. Kwun, H., Kim, S. Y. and Crane, J. F., 2002, Method and Apparatus Generating and Detecting Torsional Wave Inspection of Pipes or Tubes, U.S. Patent 6429650.
  15. Kim, Y. Y., Park, C. I., Han, S. W. and Cho, S. H., 2004, The Generation of Torsional Waves and the Pipe Diagnosis Using Magnetostrictive Transducers, Transactions of the Korean Society for Noise and Vibration Engineering, Vol. 14, No. 2, pp. 144-149. https://doi.org/10.5050/KSNVN.2004.14.2.144
  16. Kannan, E., Maxfield, B. W. and Balasubramaniam, K., 2007, SHM of Pipes Using Torsional Waves Generated by in Situ Magnetostrictive Tapes, Smart Materials and Structures, Vol. 16, No. 6, pp. 2505-2515. https://doi.org/10.1088/0964-1726/16/6/055
  17. Jiles, D. C., 1995, Theory of the Magnetomechanical Effect, Journal of Physics D: Applied Physics, Vol. 28, No. 8, pp. 1537-1546. https://doi.org/10.1088/0022-3727/28/8/001
  18. Thompson, R. B., 1979, Generation of Horizontally Polarized Shear Waves in Ferromagnetic Materials Using Magnetostrictively Coupled Meander-coil Electromagnetic Transducers, Applied Physics Letters, Vol. 34, No. 2, pp. 175-177. https://doi.org/10.1063/1.90719
  19. Carpenter Technology Corp. (2012, Nov. 30) $Hiperco^{(R)}$ 50HS Alloy. [Online]. Available: http://www.cartech.com/ssalloysprod.aspx?id=2492