Responses of passive sonar sensors to platform noise and vibration depending on sensed physical quantities

Eunghwy Noh; Woosuk Chang; Donghyeon Kim; Seonghun Pyo; Kyungseop Kim

doi:10.7776/ASK.2026.45.3.229

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2026 Vol.45, Issue 3 Preview Page Next Page

Responses of passive sonar sensors to platform noise and vibration depending on sensed physical quantities 수동 소나센서의 감지 물리량에 따른 플랫폼 진동소음 수신 특성 비교

31 May 2026. pp. 229-239

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Abstract

Platform noise is one of the major factors that degrade the detection performance of hull-mounted passive sonar sensors. The platform-side noise insulation performance of most sonar sensors has been evaluated under normally incident plane wave conditions. However, vibration and noise in actual environments are generated in far more diverse and complex aspects, requiring further investigation. In this study, the sensitivities of two passive sonar sensors, one sensing acoustic pressure and the other sensing particle acceleration, are compared for different types of vibration and noise sources. First, the acoustic field induced by structural vibration is classified into progressive-wave and evanescent-wave regions according to its wavenumber. The differences in the relative magnitudes of the acoustic pressure and particle acceleration fields in these regions are verified through theoretical and finite element analyses. Subsequently, analyses using a model incorporating the platform structure confirm that the sensitivity of the sonar sensors to platform-side noise and vibration varies depending on the sensed physical quantities and the types of noise and vibration sources. The results show that, compared with the acoustic pressure sensing sonar sensor, the particle acceleration sensing sonar sensor exhibits lower sensitivity to normally incident plane waves with progressive field characteristics, but higher sensitivity to vibration-induced noise with evanescent field characteristics generated by structural excitation.

Keywords

Hull-mounted passive sonar

Platform noise and vibration

Acoustic pressure

Particle acceleration

Evanescent field

플랫폼 소음은 선체부착형 수동 소나센서의 탐지성능을 저하시키는 주요 원인 중 하나이다. 현재까지의 소나센서는 대부분 수직입사 평면파 조건에서 후면소음 차단 성능을 평가해왔으나 실제 플랫폼 장착 환경에서의 소음은 훨씬 다양하고 복합적으로 발생하므로 이에 대한 추가적인 검토가 필요하다. 본 논문에서는 각각 음압과 입자가속도를 감지하는 두 종류의 수동 소나센서를 대상으로 진동소음의 유형에 따른 민감도를 비교하였다. 먼저 플랫폼 진동으로 인해 형성되는 음향장을 그 파수에 따라 진행파 영역과 소멸파 영역으로 구분하고, 각 영역에서 음압장과 입자가속도장의 상대적 크기가 다르게 나타남을 이론적 분석과 유한요소해석을 통해 검증하였다. 이후 플랫폼을 포함한 모델에 대해서도 소나센서의 후면 진동소음 민감도가 감지 물리량과 진동소음원의 유형에 따라 상이하게 나타남을 확인하였다. 결과적으로 음압 감지 방식의 소나센서에 비해 입자가속도 감지 방식의 소나센서가 진행파 특성을 가지는 수직입사 평면파에는 낮은 민감도를 보이는 반면, 구조 가진에 의해 생성되는 소멸파 특성의 진동 유기소음에 대해서는 높은 민감도를 나타내었다.

키워드

선체부착형 수동 소나

플랫폼 진동소음

음압

입자가속도

소멸파

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Information

Publisher :The Acoustical Society of Korea
Publisher(Ko) :한국음향학회
Journal Title :The Journal of the Acoustical Society of Korea
Journal Title(Ko) :한국음향학회지
Volume : 45
No :3
Pages :229-239
Received Date : 2025-11-13
Revised Date : 2026-05-26
Accepted Date : 2026-05-28
DOI :https://doi.org/10.7776/ASK.2026.45.3.229

The Journal of the Acoustical Society of KoreaISSN:1225-4428(Print) 2287-3775(Online)한국음향학회

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