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Topology optimization based on reduction methods with applications to multiscale design and additive manufacturing

Emmanuel TROMME, Atsushi KAWAMOTO, James K. GUEST

Frontiers of Mechanical Engineering 2020, Volume 15, Issue 1, Pages 151-165 doi: 10.1007/s11465-019-0564-8

Abstract: Advanced manufacturing processes such as additive manufacturing offer now the capability to control material placement at unprecedented length scales and thereby dramatically open up the design space. This includes the considerations of new component topologies as well as the architecture of material within a topology offering new paths to creating lighter and more efficient structures. Topology optimization is an ideal tool for navigating this multiscale design problem and leveraging the capabilities of advanced manufacturing technologies. However, the resulting design problem is computationally challenging as very fine discretizations are needed to capture all micro-structural details. In this paper, a method based on reduction techniques is proposed to perform efficiently topology optimization at multiple scales. This method solves the design problem without length scale separation, i.e., without iterating between the two scales. Ergo, connectivity between space-varying micro-structures is naturally ensured. Several design problems for various types of micro-structural periodicity are performed to illustrate the method, including applications to infill patterns in additive manufacturing.

Keywords： multiscale topology optimization micro-structure additive manufacturing reduction techniques substructuring staticcondensation super-element

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Development of a cloud condensation nuclei (CCN) counter using a laser and charge-coupled device (CCD

Mikyung PARK, Jinkwan OH, Kihong PARK

Frontiers of Environmental Science & Engineering 2011, Volume 5, Issue 3, Pages 313-319 doi: 10.1007/s11783-011-0346-y

Abstract: A continuous flow streamwise thermal gradient cloud condensation nuclei (CCN) counter with an aerosoldetector system was evaluated by comparing its measured number concentrations with those measured with a condensation

Keywords： aerosol cloud condensation nuclei (CCN) counter ultrafine particle

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features of new particle formation events at background sites in China and their influence on cloud condensation

Xiaojing SHEN,Junying SUN,Xiaoye ZHANG,Yangmei ZHANG,Lu ZHANG,Ruxia FAN

Frontiers of Environmental Science & Engineering 2016, Volume 10, Issue 5, doi: 10.1007/s11783-016-0833-2

Abstract: event Comparing NPF event between clean and polluted conditions Quantifying contribution to the cloud condensationThe formation rate of NPF events at these sites, as well as the condensation sink, is approximately 10Generally, the cloud condensation nuclei (CCN) number concentration can be enhanced by approximately

Keywords： New particle formation Regional background Cloud condensation nuclei Growth rate Formation rate

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Damage detection in beam-like structures using static shear energy redistribution

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 12, Pages 1552-1564 doi: 10.1007/s11709-022-0903-4

Abstract: In this study, a static shear energy algorithm is presented for the damage assessment of beam-like structuresTherefore, the change in the static shear energy is employed to determine the damage locations in beam-likeThe static shear energy is derived from the spectral factorization of the elementary stiffness matrix

Keywords： damage detection beam structure strain energy static displacement variation energy damage index

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Static balancing of planar articulated robots

Giuseppe QUAGLIA,Zhe YIN

Frontiers of Mechanical Engineering 2015, Volume 10, Issue 4, Pages 326-343 doi: 10.1007/s11465-015-0355-9

Abstract:

Static balancing for a manipulator’s weight is necessary in terms of energy saving and performance

Keywords： robotics static balancing pneumatic spring mechanical spring torque compensation

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Expressions for Differential and Apparent Coefficients of Static Friction

Wang Weiyuan

Strategic Study of CAE 2001, Volume 3, Issue 8, Pages 29-32

Abstract:

Recently, scientists and engineers are interested in coefficients of static friction on micro andOn macro scale, the friction force is proportional to load, the apparent coefficients of static frictiongeneral expression published in literatures to describe the relationship between the coefficients of staticIn this paper, from the definition of differential coefficients of static friction, the expressions fordifferential and apparent coefficients of static friction, 〓 and 〓 for several models are deduced.

Keywords： differential coefficients of static friction coefficients of static friction on micro or nano scale apparentcoefficients of static friction coefficients of static friction on macro scale

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Distribution of background equivalent static wind load on high-rise buildings

Jianguo ZHANG , Ming GU ,

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 3, Pages 241-248 doi: 10.1007/s11709-009-0036-z

Abstract: envelope (GLE) methods, are verified in terms of their accuracy in describing the background equivalent staticBased on the results, formulae of the distribution of background equivalent static load on high-rise

Keywords： high-rise buildings along-wind cross-wind background equivalent static wind load close formulae

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Micromechanics model for static and dynamic strength of concrete under confinement

ZHENG Dan

Frontiers of Structural and Civil Engineering 2008, Volume 2, Issue 4, Pages 329-335 doi: 10.1007/s11709-008-0044-4

Abstract: On the assumption that the micro fracture toughness of concrete does not vary with stain rate, the static

Keywords： comparison different interaction pseudo-force toughness

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Review of the LNG intermediate fluid vaporizer and its heat transfer characteristics

Frontiers in Energy 2022, Volume 16, Issue 3, Pages 429-444 doi: 10.1007/s11708-021-0747-y

Abstract: studies on the fluid flow and heat transfer behaviors of the supercritical LNG inside the tubes and the condensationFurthermore, corresponding experiments or numerical simulations on the cryogenic condensation heat transfer

Keywords： intermediate fluid vaporizer design of structure and intermediate fluid condensation heat transfer

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Evaluation of the static and dynamic structural performance of segmental pre-stressed concrete box girder

Ali Fadhil NASER, Zonglin WANG

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 2, Pages 164-177 doi: 10.1007/s11709-013-0196-8

Abstract: methods which are used to improve the structural performance of the bridge structure, to analyze the static

Keywords： structural performance steel plates external pre-stressing cracks grouting method static

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Combined static mixers for high viscous fluids mixing

Zhenhao XI, Weizhen SUN, Ling ZHAO, Zhaoyan LIU

Frontiers of Chemical Science and Engineering 2009, Volume 3, Issue 1, Pages 93-96 doi: 10.1007/s11705-009-0112-x

Abstract: A new static mixer Cross-over-Disc has been invented to strip off the boundary layer and to make strongFurthermore, mixing inhomogeneity for a combination of static mixing elements (four from Cross-over-Disc

Keywords： static mixer Cross-over-Disc pressure drop mixing performance high viscous fluid

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Influence of infiltration on energy consumption of a winery building

Hejiang SUN, Qingxia YANG

Frontiers in Energy 2014, Volume 8, Issue 1, Pages 110-118 doi: 10.1007/s11708-013-0293-3

Abstract: light steel structure in industrial buildings, some problems such as air leakage, water dripping and condensationThe pressurization test method and moisture condensation method were used to test the infiltration rates

Keywords： industrial building air change rate pressurization test method moisture condensation method energy cost

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Characteristics of metal magnetic memory signals of different steels under static tension

Yiliang ZHANG, Ruibin GOU, Jimin LI, Gongtian SHEN,

Frontiers of Mechanical Engineering 2010, Volume 5, Issue 2, Pages 226-232 doi: 10.1007/s11465-010-0012-2

Abstract: the characteristics of metal magnetic memory (MMM) signals of different steels during tensile test, static

Keywords： metal magnetic memory (MMM) magnetic intensity (H_p) static tension weld

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Peridynamics versus XFEM: a comparative study for quasi-static crack problems

Jinhai ZHAO, Hesheng TANG, Songtao XUE

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 4, Pages 548-557 doi: 10.1007/s11709-017-0434-6

Abstract: Peridynamics (PD) is a nonlocal continuum theory based on integro-differential equations without spatial derivatives. The fracture criterion is implicitly incorporated in the PD theory and fracture is a natural outcome of the simulation. However, capturing of complex mixed-mode crack patterns has been proven to be difficult with PD. On the other hand, the extended finite element method (XFEM) is one of the most popular methods for fracture which allows crack propagation with minimal remeshing. It requires a fracture criterion which is independent of the underlying discretization though a certain refinement is needed in order to obtain suitable results. This article presents a comparative study between XFEM and PD. Therefore, two examples are studied. The first example is crack propagation in a double notched specimen under uniaxial tension with different crack spacings in loading direction. The second example is the specimens with two center cracks. The results show that PD as well as XFEM are well suited to capture this type of behaviour.

Keywords： XFEM peridynamic bilateral crack parallel double cracks nonlocal theory

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ANN-based empirical modelling of pile behaviour under static compressive loading

Abdussamad ISMAIL

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 4, Pages 594-608 doi: 10.1007/s11709-017-0446-2

Abstract: Artificial neural networks have been widely used over the past two decades to successfully develop empirical models for a variety of geotechnical problems. In this paper, an empirical model based on the product-unit neural network (PUNN) is developed to predict the load-deformation behaviour of piles based SPT values of the supporting soil. Other parameters used as inputs include particle grading, pile geometry, method of installation as well as the elastic modulus of the pile material. The model is trained using full-scale pile loading tests data retrieved from FHWA deep foundations database. From the results obtained, it is observed that the proposed model gives a better simulation of pile load-deformation curves compared to the Fleming’s hyperbolic model and t-z approach.

Keywords： piles in compression load-deformation behaviour product-unit neural network