Transactions of the Korean Society for Noise and Vibration Engineering (한국소음진동공학회논문집)

The Korean Society for Noise and Vibration Engineering (한국소음진동공학회)
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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
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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.

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References

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