클래스 IV 플렉스텐셔널 트랜스듀서의 수신 특성 분석을 위한 등가회로 개발 = Development of Equivalent Circuit for Analyzing the Receiving Characteristics of a Class IV Flextensional Transducer

다국어 초록 (Multilingual Abstract)

Flextensional transducers are widely utilized as underwater acoustic transducers with broadband and high-sensitivity characteristics in low-frequency ranges. In this study, we have developed an equivalent circuit to facilitate the design of a class IV flextensional hydrophone.
The end-plate of the class IV transducer is essential for sustaining the structure while keeping the hydrophone waterproof in underwater environments, and the presence or absence of the end-plate changes the hydrophone’s receiving performance. Previous studies have not included the end-plate in their equivalent circuit configurations, but this study proposes a new equivalent circuit model that incorporates an elastic boundary condition representing the constraint imposed on the shell by the compressive force of the end-plate. The receiving voltage sensitivity, calculated using the proposed equivalent circuit model, shows a high degree of agreement with the finite element analysis results, confirming that the mechanical influence of the end-plate significantly affects the hydrophone’s acoustic receiver characteristics. The proposed equivalent circuit approach offers faster computation while maintaining sufficient accuracy compared to the finite element analysis, making it a useful tool for future hydrophone design. In addition, parameter sweep analysis or optimization can be done easily with the developed equivalent circuit, which helps the primary analysis of acoustic transducers.

목차 (Table of Contents)

• I. 서론 1
• II. 클래스 IV FH의 등가 회로 모델 6
• 2.1 쉘과 end-plate 8
• 2.2 압전 세라믹 스택과 인서트, 코팅 15
• 2.3 방사 임피던스 17
• III. 유한 요소 해석 19
• 3.1 유한 요소 해석 모델링 및 해석 조건 설정 19
• 3.2 유한 요소 해석 결과 및 주요 특성 분석 21
• IV. 모델 검증 및 parameter sweep 분석 23
• 4.1 등가 회로 해석과 유한 요소 해석 결과 비교 23
• 4.2 등가 회로 해석을 활용한 parameter sweep 분석 26
• V. 결론 30
• 참고문헌 32
• 영문초록 35