Global Structural Response Analyses of a Trimaran with Equivalent Regular Design Waves

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簡歷

基本資料

Project title

Code/計畫編號

MOST107-2221-E019-020

Translated Name/計畫中文名

等效設計規則波之三體船整體結構反應分析

Project Coordinator/計畫主持人

Chih-Chung Fang

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Systems Engineering and Naval Architecture

Website

https://www.grb.gov.tw/search/planDetail?id=12674273

Year

2018

Start date/計畫起

01-08-2018

Expected Completion/計畫迄

01-07-2019

Bugetid/研究經費

575千元

ResearchField/研究領域

機械工程

本計畫研究重點在於針對高速三體船重要且具特色的波浪負荷進行分析，並找出三體船在25年航行年限中所發生的極值負荷，以等效設計規則波概念，進行全船有限元素分析，透過船體有限元素模型找出三體船在等效設計規則波下之應力集中區域，在不影響航行安全情況下，達成三體船結構輕量化之設計需求，提昇國內在三體高速客輪之結構直接計算分析之核心競爭力。三體船的優點在於可以比單船體具較細長的主船體，並由左右輔船體增加船舶航行時的穩度，因此可以有效降低阻力，而且可提供較大的甲板空間提供載客和貨物，但因為需要擁有高速的特性，其結構重量需要特別注意，若設計過於保守則會增加輕船重量，減少載重量，也不利於高速航行，反之設計的強度若不足，則會造成航行時安全上的問題；三體船其特殊的外型，除了主船體擁有單體船的負荷特性，主船體與輔船體之間之橫跨甲板連結，也擁有與雙體船相似的負荷特性。本研究藉由HSC-3D三維小板法對三體船在規則波中進行計算負荷RAO、非規則波之短期與長期所受到的負荷極值進行分析，再進行等效設計規則波擇定，據以進行水線下船殼之波浪動壓力與全船體在波浪中之加速度變化產生之慣性力，將兩者結合後，使用船體有限元素模型進行分析三體船在長期極限負荷之縱向扭矩和垂向波彎矩，及橫跨甲板之扳裂剪力、扳裂力矩和橫向扭矩發生的結構反應。 A structure of trimaran consists of one central-hull and two side hulls , with a cross deck connecting all of them. The advantages that the trimaran offers the high speed and relatively stable performances and more spacious space to load cargo or passenger. The structure of trimaran is complex, the central-hull has mono-hull load characteristics, and the cross deck also has similar catamaran load characteristics, so the structural analyses of trimaran in waves are important to Naval Architect. Based on the technique of equivalent regular design waves, the ship inertial forces, hydrodynamic pressure distributions of FEM model nodes have been calaulated by the 3D panel method. The global structural response analyses of a trimaran in waves have been carried out by using the FEM analysis software ANSYS to get the structure responses and stress concentrations of the trimaran in waves. Based on the numerical study, the stress concentrations on the amidship which connect the bridge and the corss deck have been occurred. The stress concentrations on the cross deck are found nearby the stern in the oblique wave conditions. The stress concentrations at transverse bulkhead are due to the bending moment when side hulls in wave crest or wave trough.

Keyword(s)

三體船
三維小板法
負荷極值
等效設計規則波
波浪壓力
結構反應
Trimaran
3D panel method
Extreme load
Equivalent regular design waves
Wave pressure
Structure response

DSpace CRIS

Global Structural Response Analyses of a Trimaran with Equivalent Regular Design Waves

基本資料

Description