Session: 02-05-04 Extreme Loads and Responses 4

Paper Number: 123787

123787 - A Gradient Mesh Analysis of Numerical Ship Model With Two-Way Stiffened Plate Equivalence 

With the development of ships in recent years, the ship size becomes larger and the hull structure becomes complicated. The entire ship should be modeled to study the dynamic responses as the key equipment may be located away from the loading area, leading to a dramatic increase in numerical model element number. The stiffener attached to the hull plate may further make the numerical simulation time-consuming even difficult to converge and stabilize. Thus, it is necessary to reduce the element number of stiffened plates for the ship model. Current approaches may only consider the single in-plane or out-of-plane stiffness equivalence to smear the stiffener onto the plating. Besides, the applicability may be limited to the one-way stiffened plate. In this study, a simplified approach considered the coupling effect of in-plane and out-of-plane stiffnesses for two-way stiffened plate is proposed. Firstly, the equilibrium and compatibility equations are used to equal the stiffness of stiffened plate to the single plate with orthotropic material properties. Then the coupled load-deformation relationship of the equivalent single plate is derived based on the orthotropic material parameters and first-order shear deformation theory. Based on the mechanical property equivalence, the transverse stiffener and the longitudinal stringer of numerical ship model can be removed. Subsequently, the simplification of stiffener can amplify the maximum mesh size from stiffener spacing to web frame spacing, which can further reduce the number of elements. The fine mesh can be used for the loading and focus regions of the model, while the coarse mesh can be used for the rest region. Finally, the various dynamic evaluations are conducted to discuss the applicability of the approach. The results show that the equivalent single plate combined with the gradient mesh approach can improve the computational efficiency and stability with high accuracy.

Presenting Author: Yuchao Yuan Shanghai Jiao Tong University

Presenting Author Biography: Yuchao Yuan, Associated Professor, Ph.D. Supervisor, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University. Secretary General of Structural Mechanics Group in Sub-association for Marine and Offshore Steel Structures, CSCS. Secretary General of Structural Mechanics Group in Shanghai Society of Naval Architects and Marine Engineers. Young Talents Program Rising-Star Talent of China National Nuclear Corporation. Editorial Board of Journal of Ship Engineering. Reviewer of domestic and foreign academic journals and conference.
The main research direction is the design and development of new structures of ships and marine equipment, including the safety assessment of ships and marine structures, the multi-objective optimization design of structures based on intelligent algorithms, the mechanical and failure behavior research of sea ice and composite structures, and the multi-physical field coupling modeling and analysis.
Presided over more than 20 national, provincial and ministerial scientific research projects. Published more than 70 academic papers as the first or corresponding author, including more than 40 SCI papers.

Authors:

Muzhi Li Shanghai Jiao Tong University
Xiaolei Liu Shanghai Jiao Tong University
Yuchao Yuan Shanghai Jiao Tong University
Wenyong Tang Shanghai Jiao Tong University
Zhongdi Duan Shanghai Jiao Tong University
Hongxiang Xue Shanghai Jiao Tong University
Jun Liu Shanghai Jiao Tong University