Effect of Gas-Filled Cavity Of! Frequency Response of a Pressure Transducer

기포로 채워진 캐비티가 압력 센서의 주파수 응답 특성에 미치는 영향

  • 강관형 (삼성중공업(주) 조선플랜트연구소) ;
  • 이무열 (삼성중공업(주) 조선플랜트연구소) ;
  • 김영기 (삼성중공업(주) 조선플랜트연구소)
  • Published : 2000.06.22

Abstract

The resonant frequency of a gas-filled cylindrical Helmholtz resonator in a liquid is obtained analytically. The equation of motion of the resonator is derived by using the condition of equilibrium of forces acting on the mass in the neck of the resonator. The reaction force on the upper side of the cylinder due to the acceleration of external fluid and sound radiation is obtained by using the analytical results for the baffled circular-piston problem. From the frequency response function of the resonator, a formula to predict the resonant frequency of the resonator is derived. It is shown that the resonant frequency of the Helmholtz resonator significantly decreases due to the cushioning effect of gas inside the cavity. Therefore, when a pressure transducer is to be installed in a pin-hole type mounting method, much care should be paid to remove the gas from the cavity.

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