범용 유한요소해석 프로그램을 이용한 선박 진동인텐시티 해석 및 가시화 시스템 개발 = Development of Analysis and Visualization for Ship Structure Intensity Using General Purpose FEA Program

다국어 초록 (Multilingual Abstract)

To assure competitive edge at worldwide market for high added-value ships such as cruise vessel requiring comfortable onboard environment for crews and passengers, advanced low-vibration and high-quality ship design technology is necessary. However, the traditional design method by forced vibration analysis of ship may require trial and error design and analysis if severe ship vibration is expected. This is because the method only gives vibratory response and one can not obtain information on what sources induce the vibration and which structures are weak.
On the other hand, structural intensity analysis, which calculates vibratory power from vibratory velocity and internal force of structures, can give information on source power, dominant transmission path and sinks of vibration energy. Hence, the analysis method is useful for identifying the cause of severe vibration and preparing effective countermeasures. However, it is difficult to find structural intensity analysis technology and its application for low vibration ship design.
In this study, we aim to develop structure intensity analysis and its application technology including its visualization system to apply for low vibration ship structure design. For the purpose, we present structural intensity analysis and visualization method using both a general purpose finite element analysis program MSC/Nastran for general 3-dimensional thin walled structures. The presented methods are qualitatively validated by the examination of vibratory energy flow through structural intensity analysis for bare plate, thickness-varying plate, plate with damper, plate with the excitation of in-plane pressure. Finally, we carried out structural intensity analysis of 70,500 DWT crude oil tanker and investigate the structural intensity path of the ship.

목차 (Table of Contents)

• 목차
• 표 목차 = ⅲ
• 그림목차 = ⅳ
• 제 1 장 서론 = 1
• 1.1 연구 배경 = 1
• 1.2 연구 동향 = 2
• 1.3 연구 내용 = 4
• 제 2 장 유한요소법을 이용한 진동인텐시티 해석 = 6
• 2.1 2차원 유한요소의 진동인텐시티 = 6
• 2.2 2차원 유한요소의 진동변위와 내력 산정 = 10
• 제 3 장 진동인텐시티 해석과 가시화 시스템 = 11
• 3.1 해석 및 가시화 시스템 구성 = 11
• 3.2 가시화 방법 = 12
• 3.2.1 좌표변환 = 12
• 3.2.2 MSC/Patran 2.5 Results Files = 14
• 3.2.3 Element Results File = 15
• 3.2.4 Template Files = 16
• 제 4 장 수치해석 및 가시화 예 = 18
• 4.1 평판 = 18
• 4.2 두께가 다른 평판 = 21
• 4.3 감쇠기의 위치 및 크기 변화가 있는 평판 = 24
• 4.4 기둥으로 연결된 두 평판 = 29
• 4.5 유공판 = 31
• 4.6 면내 기진 압력을 받는 보강판 = 34
• 4.7 70,500 DWT 원유 운반선 = 37
• 4.7.1 추력 블록에 작용하는 종 기진력 = 39
• 4.7.2 프로펠러 표면전달력 = 45
• 제 5 장 결론 및 향후 과제 = 53
• 5.1 결론 = 53
• 5.2 향후 과제 = 54
• 참고문헌 = 55
• Abstract = 59