수중 원통형 쉘 구조물의 고주파 진동 전달특성에 대한 실험적 연구
Experimental Study on High Frequency Vibration Transfer Characteristic of Underwater Cylindrical Shell
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초록
Underwater vehicles such as UUVs (Unmanned Underwater Vehicles) and ROVs (Remotely Operated Vehicles) use sonar to detect their underwater environment or other underwater vehicles. The underwater vehicles designed recently have an electrical power system with high rotational speed. This system can generate high frequency vibrations above 10 kHz, and these vibrations can cause bad (negative) effects on the performance of the sonar. In many previous investigations, numerical analyses have been used for high frequency vibration problems. In this study,an experimental analysis was carried out, and a circular cylindrical shell was considered as the hull structure of an underwater vehicle. Frequency transfer functions for the circular cylindrical shell were identified using an experimental vibration analysis in the air and in a fully-submerged condition. We compare the frequency transfer functions in the air and water to obtain hydro-elastic effects. It is found that the dynamic characteristics of the circular cylindrical shell are changed by varying the response position.
Abstract
Underwater vehicles such as UUVs (Unmanned Underwater Vehicles) and ROVs (Remotely Operated Vehicles) use sonar to detect their underwater environment or other underwater vehicles. The underwater vehicles designed recently have an electrical power system with high rotational speed. This system can generate high frequency vibrations above 10 kHz, and these vibrations can cause bad (negative) effects on the performance of the sonar. In many previous investigations, numerical analyses have been used for high frequency vibration problems. In this study,an experimental analysis was carried out, and a circular cylindrical shell was considered as the hull structure of an underwater vehicle. Frequency transfer functions for the circular cylindrical shell were identified using an experimental vibration analysis in the air and in a fully-submerged condition. We compare the frequency transfer functions in the air and water to obtain hydro-elastic effects. It is found that the dynamic characteristics of the circular cylindrical shell are changed by varying the response position.
참고문헌 (6)
- 김병모, "원통 셸의 접수 진동 해석", 한국해양과학기술협의회 공동학술대회, pp.2327~2331 (2010)
- 민천홍, "원통셸 구조물의 고주파 진동 해석을 위한 기초연구", 한국해양공학회 2010년도 추계학술대회 논문집, pp.137~140 (2010)
- 신창주, "원통형 배열 구조물의 접수진동 해석", 한국마린엔지니어링학회지, 33(1), pp.175~182 (2009), 한국마린엔지니어링학회
- Min, C.H., "An Experimental Study on the Hydro-elastic Analysis of a Circular Cylindrical Shell", The Ninth (2010) ISOPE Pacific, 2010, 275~281
- Min, C.H, "An Experimental Study on High-Frequency Vibration Analysis of a Circular Cylindrical Shell in Contact with Water", The Twenty-first International Offshore(Ocean) and Polar Engineering Conference, ISOPE, pp.322~326 (2011)
- Ugurlu, B, "A Hydroelastic Investigation of Circular Cylindrical Shells-containing Flowing Fluid with Different End Conditions", Journal of Sound and Vibration, 318, pp.1291~1312 (2008)