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Digital high-efficiency print forming method and device for multi-material casting molds

Zhongde SHAN, Zhi GUO, Dong DU, Feng LIU, Wenjiang LI

Frontiers of Mechanical Engineering 2020, Volume 15, Issue 2,   Pages 328-337 doi: 10.1007/s11465-019-0574-6

Abstract: This study proposes a novel high-efficiency print forming method and device for multi-material castingThe proposed method is specifically related to the integrated forming of two-way coating and printingThese processes can realize the high-efficiency print forming of high-performance sand molds.efficiency of sand mold fabrication can be increased by 200% using the proposed two-way coating and printing methodThe integrated forming method for layered heating and roller compaction presented in this study effectively

Keywords： multi-material casting mold     3D printing     efficient print forming method    

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Finite element simulations of sheet metal forming under complex strain paths

CHEN Wei, YANG Jichang, WU Xiaofeng, LU Dun, GUO Weigang

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 4,   Pages 399-403 doi: 10.1007/s11465-007-0069-8

Abstract: According to this, a method that integrates the finite element simulation and experiment was used toresearch the forming limit diagrams of the sheet metal under complex strain paths.Finally, the forming method of the rear hanger is confirmed.Results indicate that finite element method (FEM) can achieve the complex strain paths and differentstrain paths will have great impacts on the result of the sheet metal forming.

Keywords： dangerous     forming method     different     hanger     forming    

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FEM-based strain analysis study for multilayer sheet forming process

Rongjing ZHANG,Lihui LANG,Rizwan ZAFAR

Frontiers of Mechanical Engineering 2015, Volume 10, Issue 4,   Pages 373-379 doi: 10.1007/s11465-015-0371-9

Abstract: To further explore the novel method, this study conducts a finite element method-based (FEM-based) strainanalysis on multilayer blanks by using the 3A method.Different forming modes such as wrinkling and fracture are discussed by using experimental and numericalHydroforming is used for multilayer forming.this study will enhance the knowledge on the mechanics of multilayer structures formed by using the 3A method

Keywords： finite element method (FEM)     strain analysis     multilayer sheet forming    

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Application of an efficient stochastic calculation method on the seismic analysis of an isolated structure

Wei GUO, Zhiwu YU

Frontiers of Structural and Civil Engineering 2012, Volume 6, Issue 4,   Pages 379-384 doi: 10.1007/s11709-012-0180-8

Abstract: Based on this drawback, a new, more efficient stochastic calculation method, an improvement on the pseudo-excitationmethod, is introduced.This method is then applied to the seismic analysis of an isolated structure.with the forced decoupling, matrix inversion and iteration methods, it is shown that the presented methodBased on the results of the example presented in this paper, the given method is applicable to the seismic

Keywords： isolated structure     stochastic response     non-proportional damping     efficient     accurate     pseudo-excitationmethod    

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New method for efficient control of hydrogen sulfide and methane in gravity sewers: Combination of NaOH

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 6, doi: 10.1007/s11783-021-1509-0

Abstract:

• The combination of NaOH and nitrite was used to control harmful gas in sewers.

Keywords： Sewer corrosion     Sulfide control     Combination treatment     NaOH     Nitrite    

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An efficient method for the dynamic interaction of open structure-foundation systems

LIU Jingbo, GU Yin, LI Bin, WANG Yan

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 3,   Pages 340-345 doi: 10.1007/s11709-007-0045-8

Abstract: scattering problem is changed to a wave source problem by employing an equivalent seismic wave input methodSubsequently, the modal superposition method is adopted to solve the approximated hermetic system.This procedure is highly efficient in analyzing dynamic structure-foundation interaction problems inTwo numerical examples are presented to illustrate the characteristics of the proposed method: one isCompared with the traditional direct step-by-step integration method, the proposed method, with a sufficient

Keywords： structure-foundation interaction     superposition     interaction problem     freedom     efficient    

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An efficient two-stage approach for structural damage detection using meta-heuristic algorithms and groupmethod of data handling surrogate model

Hamed FATHNEJAT, Behrouz AHMADI-NEDUSHAN

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 4,   Pages 907-929 doi: 10.1007/s11709-020-0628-1

Abstract: In this study, the performance of an efficient two-stage methodology which is applied in a damage detectionMoreover, a modal property change vector is evaluated using the group method of data handling (GMDH)Moreover, the GMDH model is also more efficient and mimics the behavior of the structure slightly better

Keywords： two-stage method     modal strain energy     surrogate model     GMDH     optimization damage detection    

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Formation mechanism and modeling of surface waviness in incremental sheet forming

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 2, doi: 10.1007/s11465-022-0679-1

Abstract: Improving and controlling surface quality has always been a challenge for incremental sheet forming (For more efficient engineering application, a theoretical model for waviness height is proposed based

Keywords： surface waviness     incremental sheet forming     numerical simulation     formation mechanism     deformation history    

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Meshless numerical method based on tensor product

SUN Haitao, WANG Yuanhan, MIAO Yu

Frontiers of Structural and Civil Engineering 2008, Volume 2, Issue 2,   Pages 166-171 doi: 10.1007/s11709-008-0021-y

Abstract: conditions is constructed by spanning base space to make the MLS interpolation scheme simpler and more efficientOwing to expanded basis functions selection, some drawbacks in general MLS method, for example repeatedNumerical examples illustrate that the proposed method is characterized by simple mathematical concept

Keywords： mathematical     continuity     inversion     selection     efficient    

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Hybrid forming mechanism of patternless casting and laser cladding

Zhongde SHAN, Fuzhen SUN, Yang LIU

Frontiers of Mechanical Engineering 2019, Volume 14, Issue 4,   Pages 393-401 doi: 10.1007/s11465-019-0550-1

Abstract: In accordance with the requirement of manufacturing dies quickly and economically, a hybrid forming methodThe method combines digital patternless casting and high-power laser cladding.An experimental study is conducted on the hybrid forming process and its trial production and application

Keywords： patternless casting     laser cladding     hybrid forming     rapid tooling    

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Highlight yield forming and innovative technologies in tropical crops

Wenquan WANG

Frontiers of Agricultural Science and Engineering 2016, Volume 3, Issue 4,   Pages 283-284 doi: 10.15302/J-FASE-2016128

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Properties and effect of forming sewage sludge into lightweight ceramics

Min YUE, Qinyan YUE, Yuanfeng QI, Baoyu GAO, Hui YU

Frontiers of Environmental Science & Engineering 2012, Volume 6, Issue 1,   Pages 117-124 doi: 10.1007/s11783-010-0220-3

Abstract: In this work we investigated the chemical, thermal and toxic properties of dried sewage sludge (DSS), the preparation and properties of lightweight sludge ceramic (LSC) and the mechanisms of action of the organic and inorganic foaming agents (OFAs and IFAs). The chemical components and thermal properties of the raw materials were studied by Energy Dispersive X-ray Detection (EDX) and Thermogravimetric Analysis and Differential Scanning Calorimetry (DSC/TGA). The mineral phases of the raw materials and the formed ceramics were determined by X-ray Diffraction (XRD). The leaching characteristics of heavy metals were investigated with Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES). Different ratios of DSS and clay were mixed and pressed into raw pellets. After drying and preheating treatment, the raw pellets were sintered at 1150°C for 10 min. The physical properties of LSC (50 wt% DSS added) were tested. The results showed that when the addition of DSS was above 50 wt%, LSC began to shrink, and a maximum density occurred. The environmental safety of LSC was satisfactory. XRD showed that some new mineral phases formed in the LSC. Observation of the microstructure by Scanning Electron Microscope (SEM) indicated that the body of LSC was porous.

Keywords： sludge     foaming agents     ceramics     preheating process    

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Transient performance comparison of grid-forming converters with different FRT control strategies

Frontiers in Energy 2023, Volume 17, Issue 2,   Pages 239-250 doi: 10.1007/s11708-022-0856-2

Abstract: Grid-forming converters (GFMs) are faced with the threat of transient inrush current and synchronization

Keywords： grid-forming converters (GFMs)     fault ride through (FRT)     transient stability     transient inrush current    

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An efficient stochastic dynamic analysis of soil media using radial basis function artificial neural

P. ZAKIAN

Frontiers of Structural and Civil Engineering 2017, Volume 11, Issue 4,   Pages 470-479 doi: 10.1007/s11709-017-0440-8

Abstract: In this study, the stochastic dynamic analysis of soil mass is performed by finite element method inIn this research, artificial neural network is proposed and added to Monte Carlo method for sake of reducing

Keywords： stochastic analysis     random seismic excitation     finite element method     artificial neural network     frequency    

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A new method for the synthesis of molybdovanadophosphoric heteropoly acids and their catalytic activities

ZHANG Fumin, GUO Maiping, GE Hanqing, WANG Jun

Frontiers of Chemical Science and Engineering 2007, Volume 1, Issue 3,   Pages 296-299 doi: 10.1007/s11705-007-0054-0

Abstract: An environmentally benign method for the synthesis of heteropoly acids HPMoVO·HO (PMoV, = 1−3) was developedThe as-synthesized samples were found to be an efficient catalyst for the hydroxylation of benzene which

Keywords： conversion     heteropoly     Characterization     efficient catalyst     Keggin-type phosphomolybdic    

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Title Author Date Type Operation

Digital high-efficiency print forming method and device for multi-material casting molds

Zhongde SHAN, Zhi GUO, Dong DU, Feng LIU, Wenjiang LI

Journal Article

Finite element simulations of sheet metal forming under complex strain paths

CHEN Wei, YANG Jichang, WU Xiaofeng, LU Dun, GUO Weigang

Journal Article

FEM-based strain analysis study for multilayer sheet forming process

Rongjing ZHANG,Lihui LANG,Rizwan ZAFAR

Journal Article

Application of an efficient stochastic calculation method on the seismic analysis of an isolated structure

Wei GUO, Zhiwu YU

Journal Article

New method for efficient control of hydrogen sulfide and methane in gravity sewers: Combination of NaOH

Journal Article

An efficient method for the dynamic interaction of open structure-foundation systems

LIU Jingbo, GU Yin, LI Bin, WANG Yan

Journal Article

An efficient two-stage approach for structural damage detection using meta-heuristic algorithms and groupmethod of data handling surrogate model

Hamed FATHNEJAT, Behrouz AHMADI-NEDUSHAN

Journal Article

Formation mechanism and modeling of surface waviness in incremental sheet forming

Journal Article

Meshless numerical method based on tensor product

SUN Haitao, WANG Yuanhan, MIAO Yu

Journal Article

Hybrid forming mechanism of patternless casting and laser cladding

Zhongde SHAN, Fuzhen SUN, Yang LIU

Journal Article

Highlight yield forming and innovative technologies in tropical crops

Wenquan WANG

Journal Article

Properties and effect of forming sewage sludge into lightweight ceramics

Min YUE, Qinyan YUE, Yuanfeng QI, Baoyu GAO, Hui YU

Journal Article

Transient performance comparison of grid-forming converters with different FRT control strategies

Journal Article

An efficient stochastic dynamic analysis of soil media using radial basis function artificial neural

P. ZAKIAN

Journal Article

A new method for the synthesis of molybdovanadophosphoric heteropoly acids and their catalytic activities

ZHANG Fumin, GUO Maiping, GE Hanqing, WANG Jun

Journal Article