수중 원통형 쉘 구조물의 고주파 진동 전달특성에 대한 실험적 연구

• Published in: Han-guk haeyang gonghak hoeji (Online) Vol. 25; no. 5; pp. 58 - 63
• Main Authors: 정현기(Hyung-Gi Jung), 민천홍(Cheon-Hong Min), 박한일(Han-Il Park)
• Format: Journal Article
• Language: Korean
• Published: 한국해양공학회 2011
• Subjects: 해양공학; Noise 소음; Underwater vehicle 수중운동체; Cylindrical shell 원통형 구조물; Excitation 가진; High frequency vibration 고주파 진동
• ISSN: 1225-0767; 2287-6715

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.