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A three-dimensional two-level gradient smoothing meshfree method for rainfall induced landslide simulations

Dongdong WANG, Jiarui WANG, Junchao WU, Junjun DENG, Ming SUN

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 2,   Pages 337-352 doi: 10.1007/s11709-018-0467-5

Abstract: A three-dimensional two-level gradient smoothing meshfree method is presented for rainfall induced landslideThe two-level gradient smoothing for meshfree shape function is elaborated in the three-dimensional Lagrangiansmoothing operation without the requirement of derivative computation in the present formulation, the two-levelSubsequently, the two-level smoothed gradient of meshfree shape function is employed to discretize theThe effectiveness of the present three-dimensional two-level gradient smoothing meshfree method is demonstrated

Keywords： meshfree method     landslide     rainfall     three-dimensional two-level gradient smoothing     nodal integration    

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Two-level uncapacitated lot-sizing problem considering the financing cost of working capital requirement

Yuan BIAN, David LEMOINE, Thomas G. YEUNG, Nathalie BOSTEL

Frontiers of Engineering Management 2020, Volume 7, Issue 2,   Pages 248-258 doi: 10.1007/s42524-019-0069-5

Abstract: However, in literatures related to lot-sizing problem, WCR has only been studied in the single-levelIn this paper, we initially adopt WCR model for a multi-level case.A two-level (supplier–customer) model is established on the basis of the classic multi-level lot-sizingTo tackle this problem, we propose sequential and centralized approaches to solve the two-level case

Keywords： two-level ULS problem     lot-sizing     working capital requirement     ZIO property     infinite production capacity    

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Connected Vehicle Based Traffic Signal Coordination Article

Wan Li, Xuegang Ban

Engineering 2020, Volume 6, Issue 12,   Pages 1463-1472 doi: 10.1016/j.eng.2020.10.009

Abstract:

This study presents a connected vehicles (CVs)-based traffic signal optimization framework for a coordinatedDue to the complexity of the model, we decompose the problem into two levels: an intersection level toIn order to solve the two-level model, a prediction-based solution technique is developed.signal timing and coordination plan, the signal timing plans generated by solving the MINLP and the two-levelWhen considering varies vehicle types under high demand levels, the proposed two-level model reduced

Keywords： Connected vehicles     Traffic signal coordination     Dynamic programming     Two-level optimization     Mixed-integer    

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Simulation of heterogeneous two-phase media using random fields and level sets

George STEFANOU

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 2,   Pages 114-120 doi: 10.1007/s11709-014-0267-5

Abstract: This paper provides a critical examination of existing random field models of heterogeneous two-phasemedia with emphasis on level-cut random fields which are a special case of translation fields.The case of random level sets, often used to represent the geometry of physical systems, is also examinedTwo numerical examples are provided to illustrate the basic features of the different approaches.

Keywords： microstructure     random fields     level sets     shape recovery     two-phase media    

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Two-level hierarchical feature learning for image classification Article

Guang-hui SONG,Xiao-gang JIN,Gen-lang CHEN,Yan NIE

Frontiers of Information Technology & Electronic Engineering 2016, Volume 17, Issue 9,   Pages 897-906 doi: 10.1631/FITEE.1500346

Abstract: In this paper, we propose a novel two-level hierarchical feature learning framework based on the deepPoint Count (CPC) datasets demonstrate that the expression ability of the deep features resulting from two-level

Keywords： Transfer learning     Feature learning     Deep convolutional neural network     Hierarchical classification     Spectral clustering    

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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

Frontiers of Mechanical Engineering 2020, Volume 15, Issue 3,   Pages 390-405 doi: 10.1007/s11465-020-0588-0

Abstract: The level set method (LSM), which is transplanted from the computer graphics field, has been successfullyintroduced into the structural topology optimization field for about two decades, but it still has notIn this study, a level set band method is proposed to overcome this drawback in handling topology changesin the level set framework.The proposed method demonstrates a flexible topology change by applying a certain size of the level set

Keywords： level set method     topology optimization     density-based method     level set band    

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Geometrically constrained isogeometric parameterized level-set based topology optimization via trimmed

Yingjun WANG,David J. BENSON

Frontiers of Mechanical Engineering 2016, Volume 11, Issue 4,   Pages 328-343 doi: 10.1007/s11465-016-0403-0

Abstract: the fast point-in-polygon (PIP) algorithm and trimmed elements is proposed for isogeometric topology optimizationThe isogeometric parameterized level-set-based TO method, which directly uses the non-uniform rationalbasis splines (NURBS) for both level set function (LSF) parameterization and objective function calculation

Keywords： isogeometric analysis     topology optimization     level set method     arbitrary geometric constraint     trimmed element    

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Level set-based isogeometric topology optimization for maximizing fundamental eigenfrequency

Manman XU, Shuting WANG, Xianda XIE

Frontiers of Mechanical Engineering 2019, Volume 14, Issue 2,   Pages 222-234 doi: 10.1007/s11465-019-0534-1

Abstract: In this study, we develop an isogeometric analysis (IGA)-based level set model for the formulation andsolution of topology optimization in cases with maximum eigenfrequency.set surface, that is, the level set function.The method is applied to topology optimization problems of maximizing the fundamental eigenfrequencysingle target eigenmode is employed to prevent the exchange of eigenmode order number in eigenfrequency optimization

Keywords： topology optimization     level set method     isogeometric analysis     eigenfrequency    

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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

Frontiers of Mechanical Engineering 2019, Volume 14, Issue 2,   Pages 171-189 doi: 10.1007/s11465-019-0530-5

Abstract: In this paper, a parametric level-set-based topology optimization framework is proposed to concurrentlyThe concurrent optimization is achieved by a computational framework combining a new parametric levelWithin the proposed framework, both the structural boundary evolution and the effective infill property optimizationThis overcomes the intrinsic disadvantage of the conventional RBF-based parametric level set method,The isotropic infill achieved via the mesoscale topology optimization is conformally fit into the wrapping

Keywords： concurrent topology optimization     parametric level set method     cardinal basis function     shell-infill structure    

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Conceptual design of compliant mechanisms using level set method

Shi-kui CHEN, Michael Yu WANG

Frontiers of Mechanical Engineering 2006, Volume 1, Issue 2,   Pages 131-145 doi: 10.1007/s11465-006-0018-y

Abstract: We propose a level set method-based framework for the conceptual design of compliant mechanisms.In this method, the compliant mechanism design problem is recast as an infinite dimensional optimizationlevel set function, and the dynamic variations of the shape are governed by the Hamilton-Jacobi partialThe application of level set methods endows the optimization process with the particular quality thatdifferential equation with the shape gradient of the objective functional, we go further to transform the optimization

Keywords： splitting     minimum     dimensional optimization     Hamilton-Jacobi     topological    

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XFEM schemes for level set based structural optimization

Li LI, Michael Yu WANG, Peng WEI

Frontiers of Mechanical Engineering 2012, Volume 7, Issue 4,   Pages 335-356 doi: 10.1007/s11465-012-0351-2

Abstract:

In this paper, some elegant extended finite element method (XFEM) schemes for level set method structuraloptimization are proposed.Firstly, two- dimension (2D) and three-dimension (3D) XFEM schemes with partition integral method arecompliance minimization examples that are widely used in the recent literature of structural topology optimizationwith the level set method.

Keywords： structural optimization     level set method     extended finite element method (XFEM)     computational accuracy    

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TRADE-OFFS IN THE DESIGN OF SUSTAINABLE CROPPING SYSTEMS AT A REGIONAL LEVEL: A CASE STUDY ON THE NORTH

Frontiers of Agricultural Science and Engineering 2022, Volume 9, Issue 2,   Pages 295-308 doi: 10.15302/J-FASE-2021434

Abstract: how 30 different crop rotations practiced in the North China Plain could be combined at the regional levelThe model uses evolutionary multi-objective optimization to maximize revenues, livestock products, dietarywas concluded that a holistic analysis of the potential of a diversity cropping systems at a regional level

Keywords： crop rotation / food security / multi-objective optimization / water use    

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Shape and topology optimization for tailoring the ratio between two flexural eigenfrequencies of atomic

Qi XIA,Tao ZHOU,Michael Yu WANG,Tielin SHI

Frontiers of Mechanical Engineering 2014, Volume 9, Issue 1,   Pages 50-57 doi: 10.1007/s11465-014-0286-x

Abstract: In order to deal with this issue, a shape and topology optimization problem is formulated, where theratio between two eigenfrequencies is defined as a constraint and the area of the cantilever is maximizedThe optimization problem is solved via the level set based method.

Keywords： atomic force microscopy     cantilever probe     eigenfrequency     optimization    

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A regularization scheme for explicit level-set XFEM topology optimization

Markus J. GEISS, Jorge L. BARRERA, Narasimha BODDETI, Kurt MAUTE

Frontiers of Mechanical Engineering 2019, Volume 14, Issue 2,   Pages 153-170 doi: 10.1007/s11465-019-0533-2

Abstract: Regularization of the level-set (LS) field is a critical part of LS-based topology optimization (TO)The SDF is obtained using the heat method (HM) and is reconstructed for every design in the optimizationmodeled by linear elasticity, nonlinear hyperelasticity and the incompressible Navier-Stokes equations in twodimensions are presented to show the applicability of the proposed scheme to a broad range of design optimization

Keywords： level-set regularization     explicit level-sets     XFEM     CutFEM     topology optimization     heat method     signed distance    

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Optimization of Venturi tube design for pipeline pulverized coal flow measurements

WU Zhansong, XIE Fei

Frontiers in Energy 2008, Volume 2, Issue 4,   Pages 369-373 doi: 10.1007/s11708-008-0072-8

Abstract: Numerical simulations of the dilute turbulent gas-solid two-phase flow in a horizontal Venturi tube wereresults show that Venturi tube geometry strongly influences the metering of the dilute gas-particle two-phase

Keywords： gas-solid two-phase     geometry     gas-particle two-phase     Numerical     flow    

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Title Author Date Type Operation

A three-dimensional two-level gradient smoothing meshfree method for rainfall induced landslide simulations

Dongdong WANG, Jiarui WANG, Junchao WU, Junjun DENG, Ming SUN

Journal Article

Two-level uncapacitated lot-sizing problem considering the financing cost of working capital requirement

Yuan BIAN, David LEMOINE, Thomas G. YEUNG, Nathalie BOSTEL

Journal Article

Connected Vehicle Based Traffic Signal Coordination

Wan Li, Xuegang Ban

Journal Article

Simulation of heterogeneous two-phase media using random fields and level sets

George STEFANOU

Journal Article

Two-level hierarchical feature learning for image classification

Guang-hui SONG,Xiao-gang JIN,Gen-lang CHEN,Yan NIE

Journal Article

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

Journal Article

Geometrically constrained isogeometric parameterized level-set based topology optimization via trimmed

Yingjun WANG,David J. BENSON

Journal Article

Level set-based isogeometric topology optimization for maximizing fundamental eigenfrequency

Manman XU, Shuting WANG, Xianda XIE

Journal Article

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

Journal Article

Conceptual design of compliant mechanisms using level set method

Shi-kui CHEN, Michael Yu WANG

Journal Article

XFEM schemes for level set based structural optimization

Li LI, Michael Yu WANG, Peng WEI

Journal Article

TRADE-OFFS IN THE DESIGN OF SUSTAINABLE CROPPING SYSTEMS AT A REGIONAL LEVEL: A CASE STUDY ON THE NORTH

Journal Article

Shape and topology optimization for tailoring the ratio between two flexural eigenfrequencies of atomic

Qi XIA,Tao ZHOU,Michael Yu WANG,Tielin SHI

Journal Article

A regularization scheme for explicit level-set XFEM topology optimization

Markus J. GEISS, Jorge L. BARRERA, Narasimha BODDETI, Kurt MAUTE

Journal Article

Optimization of Venturi tube design for pipeline pulverized coal flow measurements

WU Zhansong, XIE Fei

Journal Article