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Long JIANG, Yang GUO, Shikui CHEN, Peng WEI, Na LEI, Xianfeng David GU
《机械工程前沿(英文)》 2019年 第14卷 第2期 页码 171-189 doi: 10.1007/s11465-019-0530-5
关键词: concurrent topology optimization parametric level set method cardinal basis function shell-infill structure design conformal mapping
Isogeometric analysis based on geometric reconstruction models
《机械工程前沿(英文)》 2021年 第16卷 第4期 页码 782-797 doi: 10.1007/s11465-021-0648-0
关键词: isogeometric analysis reconstruction model level set function trimmed element point cloud
Peng WEI, Wenwen WANG, Yang YANG, Michael Yu WANG
《机械工程前沿(英文)》 2020年 第15卷 第3期 页码 390-405 doi: 10.1007/s11465-020-0588-0
关键词: level set method topology optimization density-based method level set band
XFEM schemes for level set based structural optimization
Li LI, Michael Yu WANG, Peng WEI
《机械工程前沿(英文)》 2012年 第7卷 第4期 页码 335-356 doi: 10.1007/s11465-012-0351-2
In this paper, some elegant extended finite element method (XFEM) schemes for level set method structural optimization are proposed. Firstly, two- dimension (2D) and three-dimension (3D) XFEM schemes with partition integral method are developed and numerical examples are employed to evaluate their accuracy, which indicate that an accurate analysis result can be obtained on the structural boundary. Furthermore, the methods for improving the computational accuracy and efficiency of XFEM are studied, which include the XFEM integral scheme without quadrature sub-cells and higher order element XFEM scheme. Numerical examples show that the XFEM scheme without quadrature sub-cells can yield similar accuracy of structural analysis while prominently reducing the time cost and that higher order XFEM elements can improve the computational accuracy of structural analysis in the boundary elements, but the time cost is increasing. Therefore, the balance of time cost between FE system scale and the order of element needs to be discussed. Finally, the reliability and advantages of the proposed XFEM schemes are illustrated with several 2D and 3D mean compliance minimization examples that are widely used in the recent literature of structural topology optimization. All numerical results demonstrate that the proposed XFEM is a promising structural analysis approach for structural optimization with the level set method.
关键词: structural optimization level set method extended finite element method (XFEM) computational accuracy and efficiency
Yingjun WANG,David J. BENSON
《机械工程前沿(英文)》 2016年 第11卷 第4期 页码 328-343 doi: 10.1007/s11465-016-0403-0
In this paper, an approach based on the fast point-in-polygon (PIP) algorithm and trimmed elements is proposed for isogeometric topology optimization (TO) with arbitrary geometric constraints. The isogeometric parameterized level-set-based TO method, which directly uses the non-uniform rational basis splines (NURBS) for both level set function (LSF) parameterization and objective function calculation, provides higher accuracy and efficiency than previous methods. The integration of trimmed elements is completed by the efficient quadrature rule that can design the quadrature points and weights for arbitrary geometric shape. Numerical examples demonstrate the efficiency and flexibility of the method.
关键词: isogeometric analysis topology optimization level set method arbitrary geometric constraint trimmed element
Level set-based isogeometric topology optimization for maximizing fundamental eigenfrequency
Manman XU, Shuting WANG, Xianda XIE
《机械工程前沿(英文)》 2019年 第14卷 第2期 页码 222-234 doi: 10.1007/s11465-019-0534-1
关键词: topology optimization level set method isogeometric analysis eigenfrequency
Conceptual design of compliant mechanisms using level set method
Shi-kui CHEN, Michael Yu WANG
《机械工程前沿(英文)》 2006年 第1卷 第2期 页码 131-145 doi: 10.1007/s11465-006-0018-y
关键词: splitting minimum dimensional optimization Hamilton-Jacobi topological
A regularization scheme for explicit level-set XFEM topology optimization
Markus J. GEISS, Jorge L. BARRERA, Narasimha BODDETI, Kurt MAUTE
《机械工程前沿(英文)》 2019年 第14卷 第2期 页码 153-170 doi: 10.1007/s11465-019-0533-2
关键词: level-set regularization explicit level-sets XFEM CutFEM topology optimization heat method signed distance field nonlinear structural mechanics fluid mechanics
黄显明,易继锴
《中国工程科学》 2004年 第6卷 第4期 页码 44-50
提出了在模糊神经网络中使用Rough集理论进行网络结构设计的方法。由于Rough集理论有强大的数值分析能力,而模糊神经网络具有准确的逼近收敛能力和较高的精度,所以通过两者的结合,可以得到一种可理解性好、计算简单、收敛速度快的神经网络模型。这种网络构造方法的主要过程为:首先,利用Rough集理论对给定数据集进行规则获取;然后,根据这些规则构造模糊神经网络各层的神经元个数及相关参数初始值;最后,用BP算法迭代求出网络的各种参数,完成网络的设计。给出了一个二维非线性函数拟合的实例,进一步验证了方法的正确性。
杨春燕
《中国工程科学》 2007年 第9卷 第10期 页码 36-39
以单特征不相容问题及其解变换的研究为基础,探讨多特征不相容问题的结构、判断方法和求解方法,并以在市场营销中的应用为例说明其应用价值。这一研究将为矛盾问题的智能化处理提供新的工具。
Maximum independent set in planning freight railway transportation
Gainanov Damir N., Mladenovic NENAD, Rasskazova V. A.
《工程管理前沿(英文)》 2018年 第5卷 第4期 页码 499-506 doi: 10.15302/J-FEM-2018031
This work is devoted to the problem of planning of freight railway transportation. We define a special conflict graph on the basis of a set of acceptable train routes. The investigation aims to solve the classical combinatorial optimization problem in relation to the maximum independent set of vertices in undirected graphs. The level representation of the graph and its tree are introduced. With use of these constructions, the lower and upper bounds for the number of vertices in the maximum independent set are obtained.
关键词: independent set algorithm planning of transportation two-sided estimate
Operating mechanism and set pair analysis model of a sustainable water resources system
Chaoyang DU,Jingjie YU,Huaping ZHONG,Dandan WANG
《环境科学与工程前沿(英文)》 2015年 第9卷 第2期 页码 288-297 doi: 10.1007/s11783-014-0642-4
关键词: sustainable water resources system operating mechanism set pair analysis model Shanghai
Guilian YI, Yunkang SUI, Jiazheng DU
《机械工程前沿(英文)》 2011年 第6卷 第2期 页码 229-234 doi: 10.1007/s11465-011-0128-z
To reduce vibration and noise, a damping layer and constraint layer are usually pasted on the inner surface of a gearbox thin shell, and their thicknesses are the main parameters in the vibration and noise reduction design. The normal acceleration of the point on the gearbox surface is the main index that can reflect the vibration and noise of that point, and the normal accelerations of different points can reflect the degree of the vibration and noise of the whole structure. The K-S function is adopted to process many points’ normal accelerations as the comprehensive index of the vibration characteristics of the whole structure, and the vibration acceleration level is adopted to measure the degree of the vibration and noise. Secondary development of the Abaqus preprocess and postprocess on the basis of the Python scripting programming automatically modifies the model parameters, submits the job, and restarts the analysis totally, which avoids the tedious work of returning to the Abaqus/CAE for modifying and resubmitting and improves the speed of the preprocess and postprocess and the computational efficiency.
关键词: Abaqus secondary development Python language vibration and noise reduction K-S function vibration acceleration level
《环境科学与工程前沿(英文)》 2022年 第16卷 第3期 doi: 10.1007/s11783-021-1471-x
• Hg bioaccumulation by phytoplankton varies among aquatic ecosystems.
关键词: Plankton Hg bioaccumulation Physiological characteristics A cross-system analysis Nutrient compositions Global data set
The research on structural damage identification using rough set and integrated neural network
Juelong LI, Hairui LI, Jianchun XING, Qiliang YANG
《机械工程前沿(英文)》 2013年 第8卷 第3期 页码 305-310 doi: 10.1007/s11465-013-0259-5
A huge amount of information and identification accuracy in large civil engineering structural damage identification has not been addressed yet. To efficiently solve this problem, a new damage identification method based on rough set and integrated neural network is first proposed. In brief, rough set was used to reduce attributes so as to decrease spatial dimensions of data and extract effective features. And then the reduced attributes will be put into the sub-neural network. The sub-neural network can give the preliminary diagnosis from different aspects of damage. The decision fusion network will give the final damage identification results. The identification examples show that this method can simplify the redundant information to reduce the neural network model, making full use of the range of information to effectively improve the accuracy of structural damage identification.
关键词: rough set integrated neural network damage identification decision making fusion
标题 作者 时间 类型 操作
Concurrent optimization of structural topology and infill properties with a CBF-based level set method
Long JIANG, Yang GUO, Shikui CHEN, Peng WEI, Na LEI, Xianfeng David GU
期刊论文
Level set band method: A combination of density-based and level set methods for the topology optimization
Peng WEI, Wenwen WANG, Yang YANG, Michael Yu WANG
期刊论文
Geometrically constrained isogeometric parameterized level-set based topology optimization via trimmed
Yingjun WANG,David J. BENSON
期刊论文
Level set-based isogeometric topology optimization for maximizing fundamental eigenfrequency
Manman XU, Shuting WANG, Xianda XIE
期刊论文
A regularization scheme for explicit level-set XFEM topology optimization
Markus J. GEISS, Jorge L. BARRERA, Narasimha BODDETI, Kurt MAUTE
期刊论文
Maximum independent set in planning freight railway transportation
Gainanov Damir N., Mladenovic NENAD, Rasskazova V. A.
期刊论文
Operating mechanism and set pair analysis model of a sustainable water resources system
Chaoyang DU,Jingjie YU,Huaping ZHONG,Dandan WANG
期刊论文
Application of python-based Abaqus preprocess and postprocess technique in analysis of gearbox vibration and noise reduction
Guilian YI, Yunkang SUI, Jiazheng DU
期刊论文
Characteristics of plankton Hg bioaccumulations based on a global data set and the implications for aquatic
期刊论文