The Journal of the Acoustical Society of Korea (한국음향학회지)

The Acoustical Society of Korea (한국음향학회)
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An experimental analysis of vibration-induced noise isolation characteristics of a sonar acoustic sensor

소나 음향센서의 진동유기 소음 차단 특성에 대한 실험적 연구

  • 김경섭 (국방과학연구소 제6기술연구본부) ;
  • 제엽 (국방과학연구소 제6기술연구본부) ;
  • 김호준 (국방과학연구소 제6기술연구본부) ;
  • 조요한 (국방과학연구소 제6기술연구본부) ;
  • 이정민 (국방과학연구소 제6기술연구본부) ;
  • 김동현 (LIG넥스원(주) 해양2연구소) ;
  • 장우석 (LIG넥스원(주) 해양2연구소)
  • Received : 2018.11.08
  • Accepted : 2019.03.27
  • Published : 2019.03.31
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Abstract

In this paper, the results of underwater vibration experiment are analyzed to verify platform vibration-induced noise isolation characteristics of a hull-mounted acoustic sensor. The experimental condition causing platform vibration-induced noise is generated using the mock-up hull, where the acoustic sensor is installed, with shaker in an acoustic water tank. The performance indices of ATF (Acceleration Transfer Function), AVS (Acceleration Voltage Sensitivity), and IL (Insertion Loss) for the acoustic sensor are calculated from the output of the standard accelerometers, which are installed on the mock-up hull and the acoustic sensor, and the output signal of the acoustic sensor. The frequency-dependent noise isolation characteristics of the acoustic sensor are analyzed based on the calculated performance indices and an effectiveness of the experiment is examined.

본 논문에서는 선체부착형 음향센서의 플랫폼 진동유기 소음 차단 특성을 확인하기 위한 수중 진동 실험을 수행하고 결과를 분석하였다. 음향수조 환경에서 음향센서가 설치된 선체모사구조물과 가진기를 이용하여 플랫폼 진동유기 소음 조건을 구현하였고, 선체모사구조물 및 음향센서에 설치된 표준 가속도계와 음향센서의 출력신호 측정을 통해 음향센서의 진동차단율, 삽입손실 및 진동민감도와 같은 성능지수를 산출하였다. 산출된 성능지수 결과를 토대로 음향센서의 주파수별 소음 차단 특성을 분석하고 실험 기법의 유효성을 검토하였다.

Keywords

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Fig. 1. Experimental configuration of the vibrationinduced noise isolation experiment in water.

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Fig. 2. Block diagram of the vibration-induced noise isolation experiment in water.

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Fig. 3. Coherence between acc. value from the impedance head and acc. values from accelerometers installed on the surface of the mock-up hull.

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Fig. 4. Acceleration transfer function of the sensors with the acoustic baffle in water: w/ and w/o vibration damping pad.

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Fig. 5. Insertion loss of the baffle assembly (acoustic baffle and vibration damping pad) in water.

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Fig. 6. Time data of output voltage from one of the acoustic receiving module of the sensors: (a) w/o the baffle assembly (acoustic baffle and vibration damping pad), (b) w/ the baffle assembly an w/o fixing mounts for the acoustic receiving module, (c) full sensor system.

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Fig. 7. Acceleration voltage sensitivity of the sensors with the acoustic baffle and vibration damping pad in water: comparison of results from each acoustic receiving module.

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Fig. 8. Acceleration voltage sensitivity of the sensors with the acoustic baffle in water: w/ and w/o vibration damping pad.

References

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