A Study on the Vibration Characteristics of 3-Dimension Submerged Vehicle in Consideration of Fluid-Structure Interaction

J. Ocean Eng. Technol. 2001;15(1):19-25.

유체력을 고려한 3차원 수중압력선체의 진동특성에 관한 연구

손충렬,김경수,변효인

인하대학교 선박해양공학과,인하대학교 선박해양공학과,인하대학교 선박해양공학과

Keywords: Fluid-structure interaction, Added mass, Submerged vehicle, Natural vibration analysis, Frequency response analysis, Boundary element method

핵심용어: 유체-구조 상호작용, 부가수질량, 잠수체, 고유진동해석, 주파수 응답해석, 경계요소법

Abstract

Unlike structures in the air, the vibration analysis of a submerged or floating structure such as offshore structures or ships is possible only when the fluid-structure interaction is understood, as the whole or part of the structure is in contact with water. This paper introduces two methods to find natural frequency in consideration of fluid-structure interaction, direct coupled vibration analysis and fluid-structure modal coupled vibration analysis. The purpose of this study is to analyze the vibration characteristic of a submerged vehicle to obtain the anti-vibration design data, which could be used in the preliminary design stage. The underwater pressure hull of submerged vehicle is used as the model of this study. The F.E.M. model is meshed by shell and beam elements. Also, considering the inner hull weight, the mass element is distributed in the direction of hull length. Numerical calculations are accomplished by using the commercial B.E.M. code. The characteristics of natural frequency, mode shape and frequency-displacement response are analyzed.