Numerical Analysis of Ship under Collision and Explosion Loading Condition(II)

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Project title

Code/計畫編號

NSC100-2218-E019-002-MY3

Translated Name/計畫中文名

船舶碰撞與爆破等極端狀態造成損壞之數值模擬(II)

Project Coordinator/計畫主持人

Pai-Chen Guan

Funding Organization/主管機關

National Science and Technology Center for Disaster Reduction

Department/Unit

Department of Systems Engineering and Naval Architecture

Website

https://www.grb.gov.tw/search/planDetail?id=2283982

Year

2011

Start date/計畫起

01-08-2011

Expected Completion/計畫迄

31-07-2012

Bugetid/研究經費

460千元

ResearchField/研究領域

機械工程

數值模擬在近年來已逐漸成為船隻設計的重要工具，從船隻的效率、前進速度的分析，到承載量的預估，都已經有完整且準確的分析工具可供使用。但船隻在遇到如船底觸礁，船隻互撞，與魚雷爆破等狀況時的抵抗能力，傳統的數值模擬方法便無法準確且有效率的預測材料因碰撞或爆破所造成的材料破壞分離行為。相較於有限元素法，Meshless method於近十多年來已發展到非常完整且成熟的階段。例如他可以更輕易的處理不規則區域、高階問題、大變形問題與材料破裂分離。其中Reproducing Kernel Particle Method (RKPM)已可以用於樑、板與殼等結構物的計算。針對低速碰撞與高速穿透的問題也發展快速，此方法已被美國軍方運用於建築物武器穿透分析。所以，本計畫將以此數值方法為核心進行船舶結構行為的研究。本計畫的目標是建立一個針對船艦對於碰撞與爆破的抵抗力，完整且有效率的分析程序，耦合較精準的RKPM與較快速的FEM。本計畫包括幾樣重要的部分，第一階段為建立以RKPM為核心的數值模擬程式，主要處理船舶結構的非線性大變形。這套數值方法會與傳統有限元素法耦合；第二階段為加入材料的塑性變形與破壞行為；第三階段是加入RKPM所發展出的特殊碰撞計算法Frictional Kernel Contact；第四階段是加入平行運算，並研究無網格法之平行運算優化法。 Numerical analysis has becoming more important for design of complex structure such as naval architecture. Commercial programs have been developed for general purpose and performance of ship design, such as efficiency, speed, and carrying capacity. However, for extreme conditions such as grounding, ship collision, torpedoes attack and under water explosion, traditional numerical methods have difficulty to model the material separation, which leads to lower accuracy when the damage of the structure become severe during the loading process. On the other hand, the meshless technology has developed into a complete and mature method. The meshless method can handle irregular geometry, high order problems, extremely large deformation and material damage and separation. One of the popular meshless methods, which is called the Reproducing Kernel Particle Method (RKPM), has dramatic progress in the area of low speed contact and high speed penetration problems. This technology has been applied to problems for structure under projectile penetration analysis by the U.S. Army. In this research, the RKPM technology is the core methodology for the ship structure behavior analysis. The major goal is to develop an efficient and accurate numerical modeling program, which will focus on the analysis of ship structure resisting collision and explosion. This research project consist the following phases: (1) Establish the numerical simulation program using RKPM method. This includes the RKPM formulation for large deformation of naval structure considering geometric and material non-linearity. Also, the coupling of FEM and RKPM formulation will also be developed in order to corporate with the existing analysis platform; (2) For the consideration of material non-linear behavior, the proper plastic formulation of the ship structure components will be developed and implemented in the numerical method. Also, damage model will be studied for the simulation of material separation; (3) The Frictional contact algorithm developed under the framework of RKPM formulation will be developed for the complex contact geometry and changing surface of the contacting object due to the material separation; (4) Parallelization of the developed program from the previous stage for the efficiency purpose. The ultimate goal is to achieve fast but accuracy simulation to reduce the cost of analysis.

Keyword(s)

無網格法
牛頓卡茲高階積分
再生核法
點積分
Meshless
Newton-Cotes
RKPM
Nodal integration

DSpace CRIS

Numerical Analysis of Ship under Collision and Explosion Loading Condition(II)

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