Modeling of Sound-structure Interactions for Designing a Piezoelectric Micro-Cantilever Acoustic Vector Sensor

Seongkwan Yang; Junsoo Kim; Wonkyu Moon

doi:10.7776/ASK.2015.34.2.108

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2015 Vol.34, Issue 2 Preview Page Next Page

Modeling of Sound-structure Interactions for Designing a Piezoelectric Micro-Cantilever Acoustic Vector Sensor 압전 미세 외팔보 형 수중 음향 벡터센서의 작동 원리와 설계 기법

31 March 2015. pp. 108-116

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Abstract

An acoustic vector sensor is a device that is capable of measuring the direction of wave propagation and the acoustic pressure. In this paper, the modeling of micro-cantilever sensor for the vector sensor are proposed by consideration of acoustic phenomenon in water. Two models based on unimorph structure are proposed in this paper and corresponding transfer function which describes the relation between input pressure wave and output voltage depending on incidence angle and frequency of pressure wave is derived based on lumped model. It has been shown that very thin and flexible micro-cantilever can be used to measure directly the particle velocity component in water.

Keywords

Vector sensor

Piezoelectric effect

Micro cantilever

수중 음향 벡터센서는 음압 뿐 아니라 음파의 진행 방향에 관한 정보를 측정할 수 있는 센서이다. 본 논문에서는 미세 외팔보를 이용한 수중 음향 벡터 센서를 구현하기 위해 음향학적 이론을 바탕으로 음향과 기계 구조물의 상호작용을 이론적으로 정립하고자 하였다. 감응 방식으로 압전 효과를 이용한 두 가지 유니모프(unimorph)형태의 모델을 제시하였으며, 제시된 모델에 대하여 압전 미세 외팔보의 거동을 집중 질량 모델을 통해 음파가 임의의 주파수와 각도를 가지고 미세 외팔보로 입사할 때 나오는 신호의 크기를 구할 수 있는 전달함수를 유도하였다. 또한 이를 바탕으로 매우 얇고 유연한 구조물로 미세 외팔보를 설계하면 매질의 입자 속도에 관한 정보를 직접적으로 측정 가능한 센서로 활용할 수 있다는 것을 확인하였다.

키워드

벡터센서

압전효과

미세 외팔보

References

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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 : 34
No :2
Pages :108-116
Received Date : 2014-04-07
Revised Date : 2014-10-16
Accepted Date : 2015-01-05
DOI :https://doi.org/10.7776/ASK.2015.34.2.108

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

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