Develop the Isogeometric Analysis (Iga) Ship Structural Analysis Model for Slamming Analysis

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Project title

Code/計畫編號

MOST105-2221-E019-019

Translated Name/計畫中文名

發展IGA船體結構模型用於衝擊強度分析

Project Coordinator/計畫主持人

Pai-Chen Guan

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=11907647

Year

2016

Start date/計畫起

01-08-2016

Expected Completion/計畫迄

31-07-2017

Bugetid/研究經費

830千元

ResearchField/研究領域

機械工程

"船體結構設計由於幾何形狀複雜、加上由於船運作的環境多樣化，載重設計也必須考慮各種不同的情境，需要分析的項目與種類繁多。全船結構在建立有限元素法模型需要經歷CAD 模型繪製 (Rhino、AutoCAD、SolidWorks，etc.)、使用轉檔程式(AM、Patran)匯入有限元素法程式、定義單元(包含板、殼、樑、軸向桿)、建立網格，最後連接自由度並加入各種載重與邊界條件。設計流程最常出現狀況，也最費時的通常是建立網格的過程。本計畫對船體在海中受到海浪衝擊的問題，提出使用近年來新發展的Isogeometric analysis (IGA, T.J.R. Hughes, 2005)與本研究室建立的smoothed Reproducing Kernel Particle Method (Smoothed RKPM) 法進行流固耦合。IGA 用於船體結構分析，使用的形函數為Non-uniform rational B-splines，擁有任意調整近似方程式階數而不影響幾何形狀的特性，我們預計發展直接讀取並轉換CAD 檔案為IGA 分析程式，包含轉檔程式與發展適用船體結構的IGA 板殼基本理論與程式。流體力學的部分使用Smoothed RKPM 對表面波浪進行模擬。結構與流體的介面會引進penalty method 與kernel contact 兩種方法。所發展出的方法將會與文獻中的實驗結果進行比對。" "Ship structural design requires numerous analysis procedures due to the complexity of the geometry, variety of ship operating environment, different loading conditions. To build a Full ship structural model for the finite element analysis (FEA), it requires to go through the processes from CAD model (Rhino, AutoCAD, SolidWorks, etc.), file conversion and correction (AM, Patran), then import the model into the FEM Program. Finally define the element types and performing discretization (meshing). The most time consuming and troublesome step is the discretization due to improper model definition in the CAD program. In this research, we propose using newly developed Isogeometric analysis (IGA, T.J.R. Hughes, 2005) couple with our recently proposed smoothed reproducing kernel particle method (Smoothed RKPM) to analyze ship slamming behavior. The IGA method is employed for the ship structural model. The shape function under the IGA framework is the Non-uniform rational B-splines (NURBS) function, which are 表CM02 共 2 頁第 2 頁 usually used in CAD for describing the exact geometry of objects. We will develop a code that can directly read general CAD file, convert into a FEA model without the need of meshing step. The Mindlin plate NURBS formulation and code will be completed and applied. The Smoothed RKPM is introduced to model the free surface wave behavior. The fluid-structure interaction can be described by penalty method or kernel contact. We will study the performance of both contact algorithm. The proposed program will be validated by comparing with experimental results."

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Develop the Isogeometric Analysis (Iga) Ship Structural Analysis Model for Slamming Analysis

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