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An analysis of acoustic pressure in the center of double pipe inside of a cylindrical vibrator

원통형 진동자 내부의 이중관 중심에서의 음압해석

  • Received : 2017.01.04
  • Accepted : 2017.05.30
  • Published : 2017.05.31

Abstract

The effect of the concentric solid tube inserted inside the vibrator on the sound field distribution was analyzed for the sound waves focused on the center axis in the fluid - filled cylindrical piezoelectric transducer. The sound waves radiated from the inside of the cylindrical piezoelectric vibrator are transmitted through the fluid medium and are reflected or transmitted on the wall surface of the solid tube, and are focused on the central axis. At this time, the sound field distribution centered on the acoustic tube varies depending on the acoustic impedance and the thickness of the solid tube. In order to theoretically analyze this, the transfer matrix for each medium is derived, and the sound pressure level at the center axis is theoretically analyzed. For the acrylic tube with various thicknesses, the changing trend in the sound pressure level measured on the central axis agrees well with the result of the theoretical analysis, and it confirmed that the sound pressure formed at the center changes very sensitively with the thickness of the solid tube.

Acknowledgement

Grant : 극 초분산을 위한 집속초음파 모듈의 개발 및 최적화

Supported by : 연구성과실용화진흥원

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