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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 successfullyIn this study, a level set band method is proposed to overcome this drawback in handling topology changesin the level set framework.set band, to seamlessly combine LSM and density-based method to utilize their advantages.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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Buckling optimization of curvilinear fiber-reinforced composite structures using a parametric level set

Frontiers of Mechanical Engineering 2024, Volume 19, Issue 1, doi: 10.1007/s11465-023-0780-0

Abstract: This study proposes a level-set-based optimization framework for maximizing the buckling load of curvilinearIn the proposed method, the contours of the level set function are used to represent fiber paths.For a composite laminate with a certain number of layers, one level set function is defined by radial

Keywords： buckling optimization     curvilinear fiber     composite structure     level set method     manufacturing constraint    

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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 structuralthe proposed XFEM is a promising structural analysis approach for structural optimization with the levelset method.

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

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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 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 andThe proposed method is based on a combination of level set method and IGA technique, which uses the non-uniformused for geometry representation, but also for IGA-based dynamic analysis and parameterization of the levelset surface, that is, the level set function.

Keywords： topology optimization     level set method     isogeometric analysis     eigenfrequency    

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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.The geometric shape of the compliant mechanism is represented as the zero level set of a one-higher dimensionallevel 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 that

Keywords： splitting     minimum     dimensional optimization     Hamilton-Jacobi     topological    

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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)

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

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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 concurrentlyset approach.This overcomes the intrinsic disadvantage of the conventional RBF-based parametric level set method,A variational distance regularization method is utilized in this research to regularize the level setWith the distance information embedded in the level set model, the wrapping boundary layer and the interior

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

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Isogeometric analysis based on geometric reconstruction models

Frontiers of Mechanical Engineering 2021, Volume 16, Issue 4,   Pages 782-797 doi: 10.1007/s11465-021-0648-0

Abstract: embedded into a regular background grid, and a model reconstruction method is proposed to obtain the levelset function of the approximate model, which can be directly used in IGA.

Keywords： isogeometric analysis     reconstruction model     level set function     trimmed element     point cloud    

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Calculations of narrow-band transimissities and the Planck mean absorption coefficients of real gasesusing line-by-line and statistical narrow-band models

Huaqiang CHU, Mingyan GU, Huaichun ZHOU, Fengshan LIU

Frontiers in Energy 2014, Volume 8, Issue 1,   Pages 41-48 doi: 10.1007/s11708-013-0292-4

Abstract: Narrow-band transmissivities in the spectral range of 150 to 9300 cm and at a uniform resolution of25 cm were calculated using the statistical narrow-band (SNB) model with the band parameters of SoufianiCalculations of narrow-band transmissivity were conducted for gas columns of different lengths and containingNarrow-band transmissivities calculated by the SNB model are in large relative error at many bands.

Keywords： transimissity     HITEMP     HITRAN     Planck mean absorption coefficients    

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The Latest Development of Optical Fiber, Optical Fiber Band and Optical Cable Technology Abroad

Liu Liangyan

Strategic Study of CAE 2001, Volume 3, Issue 9,   Pages 86-94

Abstract: Then the manufacture technology of band optical fiber including its structure, coatings, properties andMulti-core optical fiber band cable manufacture technology such as twisted loose-tube, center loose-tube, frame, dry core band optical cable was also discussed.

Keywords： optical communication     low transmission loss optical fiber     optical fiber band     band optical fiber cable    

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Combining Polarization-Division Multiplexing and Ferromagnetic Nonreciprocity to Achieve In-Band Ultra-High

Amir Afshani,Ke Wu,

Engineering doi: 10.1016/j.eng.2024.02.007

Abstract: The in-band full-duplex (IBFD) wireless system is a promising candidate for 6G and beyond, as it candouble data throughput and enormously lower transmission latency by supporting simultaneous in-band transmission

Keywords： In-band full-duplex transceiver     6G     Polarization-division multiplexing     Dual-mode nonreciprocity    

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Maximum independent set in planning freight railway transportation

Gainanov Damir N., Mladenovic NENAD, Rasskazova V. A.

Frontiers of Engineering Management 2018, Volume 5, Issue 4,   Pages 499-506 doi: 10.15302/J-FEM-2018031

Abstract: We define a special conflict graph on the basis of a set of acceptable train routes.aims to solve the classical combinatorial optimization problem in relation to the maximum independent setThe level representation of the graph and its tree are introduced.these constructions, the lower and upper bounds for the number of vertices in the maximum independent set

Keywords： independent set     algorithm     planning of transportation     two-sided estimate    

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between office workers’ staying and workstation attributes in a non-territorial office using ultra wide band

Xinnan ZHANG, Takashi IZATO, Junzo MUNENOTO, Daisuke MATSUSHITA, Tetsu YOSHIDA

Frontiers of Structural and Civil Engineering 2010, Volume 4, Issue 4,   Pages 438-449 doi: 10.1007/s11709-010-0076-4

Abstract: staying and moving characteristics of office workers in a non-territorial office using an ultra wide band

Keywords： workplace     non-territorial office     staying behavior     ultra wide band (UWB)     sensor network    

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Fluorene-based narrow-band-gap copolymers for red light-emitting diodes and bulk heterojunction photovoltaic

SUN Mingliang, WANG Li, XIA Yangjun, DU Bin, LIU Ransheng, CAO Yong

Frontiers of Chemical Science and Engineering 2008, Volume 2, Issue 3,   Pages 257-264 doi: 10.1007/s11705-008-0052-x

Abstract: A series of narrow band-gap conjugated copolymers (PFO-DDQ) derived from 9,9-dioctylfluorene (DOF) andEfficient energy transfer due to exciton trapping on narrow-band-gap DDQ sites has been observed.This indicates that these kinds of low band-gap polymers are promising candidates for polymeric solar

Keywords： simulator     Efficient     band-gap     PFO-DDQ50     intensity    

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Title Author Date Type Operation

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

Buckling optimization of curvilinear fiber-reinforced composite structures using a parametric level set

Journal Article

XFEM schemes for level set based structural optimization

Li LI, Michael Yu WANG, Peng WEI

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

Conceptual design of compliant mechanisms using level set method

Shi-kui CHEN, Michael Yu WANG

Journal Article

A regularization scheme for explicit level-set XFEM topology optimization

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

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

Isogeometric analysis based on geometric reconstruction models

Journal Article

Calculations of narrow-band transimissities and the Planck mean absorption coefficients of real gasesusing line-by-line and statistical narrow-band models

Huaqiang CHU, Mingyan GU, Huaichun ZHOU, Fengshan LIU

Journal Article

The Latest Development of Optical Fiber, Optical Fiber Band and Optical Cable Technology Abroad

Liu Liangyan

Journal Article

Combining Polarization-Division Multiplexing and Ferromagnetic Nonreciprocity to Achieve In-Band Ultra-High

Amir Afshani,Ke Wu,

Journal Article

Maximum independent set in planning freight railway transportation

Gainanov Damir N., Mladenovic NENAD, Rasskazova V. A.

Journal Article

between office workers’ staying and workstation attributes in a non-territorial office using ultra wide band

Xinnan ZHANG, Takashi IZATO, Junzo MUNENOTO, Daisuke MATSUSHITA, Tetsu YOSHIDA

Journal Article

Fluorene-based narrow-band-gap copolymers for red light-emitting diodes and bulk heterojunction photovoltaic

SUN Mingliang, WANG Li, XIA Yangjun, DU Bin, LIU Ransheng, CAO Yong

Journal Article