Structual Stability Analysis According to the Lumped Mass of High Speed Vehicles in Underwater

*Naval Tech. Development Center, Jinhai, Korea**Naval Academy, Jinhai, Korea***Korean Intellectual Property Office, Daejon, Korea****Dept. Aerospace Engineering, Chosun University, Gwangju, Da ejon, KoreaKEY WORDS: Follower force 종동력, High speed vehicle 고속 운동체, Flutter instability 플러터형 불안정, Divergent instability 다이버젼스형 불안정ABSTRACT: In this paper, the effect of the position and size of a lumped mass on the structural stability of a high speed underwater veh icle is presented. For simplicity, a real vehicle was modeled as a foll ower force subjected beam that was resting on an elastic foundation, and the lumped mass effect was simplified as an elastic intermediate support. The s tability of the simplified model was numerically analyzed based on the Finite element method (FEM). This numerical simulation revealed that flutter t ype instability or divergence type instability occurs, dependin g on the position and stiffness of the elastic intermediate support, which implies th at the instability of the real model is affected by the positio n and size of the lumped mass.교신저자 오경원: 경남 진해시 현동 사서함 602-3, 055-549-3491, space1597@hanmail.net본 논문은 2008년 11월 제주도에서 개최된 한국항공우주학회 추계학술대회에 발표된 논문의 일부 내용을 발췌하였음을 밝힙니다 .