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检索条件"任意字段=第三届北京国际快速成形及制造会议暨第二届北京国际生物制造会议"

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A Novel method for Human Expression Rapid Reconstruction

A Novel method for Human Expression Rapid Reconstruction

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第三届北京国际快速成形及制造会议暨第二届北京国际生物制造会议

作者： Gang Zhou,Zhongwei Li,Kui Huang,Congjun Wang,Yusheng Shi State Key Laboratory of Material Processing and Die & Mould Technology,Huazhong University of Science and Technology,Wuhan,430074,China.

Human expression rapid reconstruction has huge potential applications in entertainment and social *** this work,a rapid human expression measurement system based on a digital fringe projection and phase-shifting technique is *** measurement system consists of a digital light processing(DLP)projector and a high-speed CCD *** DLP projector is used to project computer-generated fringe patterns onto the human face,and the high-speed CCD camera synchronized with the projector to acquire the fringe images at a frame rate of 30 frames/*** on a three-step phase-shifting method and an accurate phase-height mapping algorithm,each frame of the 3-D human expression can be *** principle of the proposed method is described and some experimental results are presented to demonstrate its *** experiment results show that the measurement system can reconstruct accurate 3D human expression at a frame rate of 10 frames per *** obvious merit of this method is that it can reconstruct the 3D human expression in a very short time and it's not sensitive to the movement of the face during the measurement processing.

关键词： Human expression reconstruction,Digital fringe projection,Phase shift

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Effect of processing parameters on thermal phenomena in direct laser metallic powder deposition

Effect of processing parameters on thermal phenomena in dire...

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第三届北京国际快速成形及制造会议暨第二届北京国际生物制造会议

作者： HU Weiwei KANG Jinwu HUANG Tianyou Key Laboratory for Advanced Materials Processing Technology Ministry of Education,Department of Mechanical Engineering,Tsinghua University,Beijing 100084,P.R.China

Direct laser metallic powder deposition technique is widely used in manufacturing,part repairing and metallic rapid *** ability to predict geometrical accuracy and residual stress requires an understanding of temperature distribution during the deposition *** study presents a numerical model of three-dimensional transient heat transfer in a finite model heated by a moving laser beam and thermal phenomena in the process are *** complex solid-liquid problem and latent heat of fusion are treated by means of equivalent thermal conductivity and modified specific heat,*** method of birth and death of elements,the growth of additive layers and the shape of melt pool are *** effect of processing parameters such as absorbed power,travel speed,and preheated temperature on melt pool sizes and cross-section of deposited layer profile are *** results obtained show the trend of the melt pool size and cross section profile during depositing the sample of 304 stainless steel and they are generally in a good agreement with experiments in published literature.

关键词： laser direct deposition melt pool cross-section profile thermal field simulation

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The effect of technical parameters on characteristics of selective laser sintering dental glass-ceramics powder

The effect of technical parameters on characteristics of sel...

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第三届北京国际快速成形及制造会议暨第二届北京国际生物制造会议

作者： Liu Jie1 Zhang Biao2 Yan Chunze1 Shi Yusheng1 1、State Key Laboratory of Material Forming and Die&Mould Technology,Huazhong University of Science and Technology,Wuhan China,430074 2、College of Stomatology,Wuhan University,Wuhan China,430079

Dental glass-ceramics restoration material has excellent physical and chemical,mechanical,aesthetic and biocompatibility ***,casting methods adopted at present have complicated procedures and high costs,especially are difficult to control the forming *** problems greatly restricted their clinical application and ***,a new forming process based on selective laser sintering technology was ***,the dental glass-ceramics was made of fine powder by taking special heat treatment ***,the dental restoration parts with demanded shapes were manufactured by using selective laser sintering without any *** the study,different forming processes with different laser power,scanning velocity,scanning interval and layer thickness,were used to make the glass-ceramics standard testing parts under different *** analyzing the relative density of the testing parts,the effect of technical parameters on the parts' performances was concluded,which will provide theoretical and technical basis for dental glass-ceramics restorations of selective laser sintering.

关键词： dental restoration SLS(selective laser sintering) rapid prototyping glass ceramics technical parameter

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Slice data based support generation algorithm for fused deposition modeling

Slice data based support generation algorithm for fused depo...

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第三届北京国际快速成形及制造会议暨第二届北京国际生物制造会议

作者： Xiaomao Huang Chunsheng Ye Jianhua Mo Gang Zhou Yusheng Shi Rapid Prototyping Center,State Key Lab.of Material Process and Die & Mould Technology,Huazhong University of Science & Technology,Wuhan 430074,People's Republic of China

Purpose-This paper aims to present a robust algorithm to generate support for fused deposition modeling(FDM).Design/methodology/approach-Since lots of flaws appear in many STL models,the algorithm utilizes slice data as input.A top-down approach is designed to calculate the support slice layer by *** entire generation algorithm process including slice grouping,oriental bounding box(OBB)calculation,offsetting,and Boolean operation is presented in *** cases validate the efficiency and robustness of the ***-The proposed algorithm successfully adds necessary supports not only for hanging surface but also for hanging vertexes and edges with O(n)time complexity,where n is the number of *** fully utilizes the parts' self-support ability then decreases the support volume at maximum ***/value-Compared to STL based algorithm,this slice data based algorithm has the same efficiency but more notable stability,which significantly enhances the robustness of support generation process.

关键词： Rapid prototype manufacturing ·Support ·Slice data ·Fused deposition modeling

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The Design and Modeling of Multi-axis Knee Artificial Leg

The Design and Modeling of Multi-axis Knee Artificial Leg

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第三届北京国际快速成形及制造会议暨第二届北京国际生物制造会议

作者： Hualong Xie School of Mechanical Engineering & Automation,Northeastern University,Shenyang 110004,P.R.China,Fei Li School of Information Science & Engineering,Shenyang University of Technology,Shenyang 110178,P.R.China Yongxian Liu School of Mechanical Engineering & Automation,Northeastern University,Shenyang 110004,P.R.China Xinhe Xu School of Information Science & Engineering,Northeastern University,Shenyang 110004,P.R.China

In order to provide an ideal test-bed for the development of intelligent bionic leg,a new pattern humanoid robot--biped robot with heterogeneous legs(BRHL)is *** simulate human normal gait well,artificial leg of BRHL adopts multi-axis knee mechanism and is different from artificial leg of common biped *** conception and research purpose of BRHL are *** on human bioscience,bionic design of multi-axis knee artificial leg is analyzed and virtual prototype is ***,kinematics model and dynamics model are deduced in *** on human normal gait data,simulation of dynamics model is *** the end,mechanical optimization design of multi-axis knee artificial leg is discussed and simulation is *** mechanism parameters of multi-axis knee artificial leg are given and prototype of BRHL is *** research indicates that multi-axis knee artificial leg can simulate human leg well.

关键词： biped robot with heterogeneous legs artificial leg multi-axis knee kinematics model dynamics model.

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Discussions on Phase-Reconstructing Algorithms for 3D Digitizing Structure-Light Profilometry

Discussions on Phase-Reconstructing Algorithms for 3D Digiti...

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第三届北京国际快速成形及制造会议暨第二届北京国际生物制造会议

作者： ZHU Yongjian,LI Anhu,YIN Shaohui,CHEN FengjunNational Engineering Research Center for High Efficiency Grinding,Hunan University,Changsha,Hunan,410082,China School of Mechanical Engineering,Tongji University,Shanghai,200092,China

For the 3D digitizing structure-light profilometry,five kinds of phase reconstructing(PR)algorithms,including Schofield's S-FFT(with 4 pairs of FFT & Inverse FFT operators)algorithm,Volkov's deterministic V-FFT PR algorithm(with only one pair of FFT operators and one Inverse FFT operator),quality-guided(QG)method,weighted least-square(WLS)method and a proposed Discrete-Cosine-Transform-Based(DCT-B)algorithm have been implemented and discussed in *** computer-simulated data show that the WLS and V-FFT enjoy the least phase error,but the QG algorithm achieves the trade-off between reliability and computational *** S-FFT together with V-FFT method almost fails to deal with the experimental data with abrupt phase *** the other three algorithms,the DCT-B algorithm shows its advantage over QG and WLS algorithms in settling these *** phase error and computational time,it could win the priority in *** experimental results also demonstrate that the proposed DCT-B algorithm could be firstly considered in the application of structure-light profilometry,especially to process the abrupt-phase maps.

关键词： structure-light profilometry phase-shifting phase reconstructing

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A novel osteochondral scaffold with a compact layer fabricated via multi-nozzle low-temperature deposition manufacturing

A novel osteochondral scaffold with a compact layer fabricat...

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第三届北京国际快速成形及制造会议暨第二届北京国际生物制造会议

作者： Li Liu,Zhuo Xiong,Renji Zhang,Le Jin,Yongnian Yan Department of Mechanical Engineering,Tsinghua University,Key Laboratory for Advanced Materials Processing Technology Ministry of Education,P.R.China,Beijing 100084

A functional-region/separate-interface/single-cell-type tissue engineering pathway was proposed to supply a promising approach to regenerate osteochondral defects that are deep to marrow cavity.A gradient osteochondral scaffold fabricated via a rapid prototyping technology called multi-nozzle low-temperature deposition manufacturing was composed of three parts with different materials and pore-structures respectively for bone,cartilage and a separate interface between *** separate interface is composed of micro-pores less than 5μm and with low *** it could reduce or avoid destroying the micro-environment in vivo by preventing the blood and cells and reducing the amount of oxygen and nutrition getting from marrow cavity to articulate *** preliminary results from 6 weeks implantation into 4mm diameter osteochondral defects in the knee joints of rabbits show that the defects with the scaffold/cells composition(experiment group)revealed bone-like or cartilage-like tissues filling the defects with smooth surface,while the defects with nothing(blank group)showed only fibrous tissues.

关键词： tissue engineering rapid prototyping osteochondral separate interface low-temperature deposition

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A Study of Melt Flow Analysis of a ABS-Iron composite in Fused Deposition Modelling Process

A Study of Melt Flow Analysis of a ABS-Iron composite in Fus...

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第三届北京国际快速成形及制造会议暨第二届北京国际生物制造会议

作者： Mostafa Nikzad S.H.Masood A.Groth I.Sbarski Faculty of Engineering and Industrial Sciences Swinburne University of Technology Departments of Health and Molecular Sciences CSIRO

Fused Deposition Modelling(FDM)is a filament based rapid prototyping system which offers the possibility of introducing new composite material for the FDM process as long as the new material can be made in feedstock filament *** has been undertaking extensive research in development of new composite materials involving ABS and other materials including *** order to predict the behaviour of new ABS based composite materials in the course of FDM process,it is necessary to investigate the flow of the composite material in liquefier *** such study is available considering the geometry of the liquefier *** paper presents 2D and 3D numerical analysis of melt flow behaviour of a representative ABS-iron composite through the 90-degree bent tube of the liquefier head of the fused deposition modelling process using ANSYS FLOTRAN and CFX finite element *** flow parameters including temperature,velocity and pressure drop have been *** of the filled ABS has been fabricated and characterized to verify the possibility of prototyping using the new material on the current FDM *** provide promising information in developing the melt flow modelling of metal-plastic composites and in optimising the FDM parameters for better part quality with such composites.

关键词： Acrylonitrile-Butadiene-Styrene(ABS),Composite,FDM,Melt flow Behaviour,ANSYS

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On Modeling Bio-Scaffolds:structural and fluid transport characterization based on 3D imaging data

On Modeling Bio-Scaffolds:structural and fluid transport cha...

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第三届北京国际快速成形及制造会议暨第二届北京国际生物制造会议

作者： NOTARBERARDINO Bruno YOUNG Philippe BAKER Matthew TABOR Gavin TURNER Irene YANG Lincoln School of Engineering Computing and MathematicsUniversity of Exeter Department of Mechanical Engineering University of Bath Shanghai Gaitech Scientific Instruments Co. Ltd.

Bio-scaffolds which are most commonly open celled porous structures are increasingly used for tissue engineering and regenerative *** studies exploring the influence of architecture on structural and flow characteristics of porous media have been carried out but these studies almost exclusively assume an idealized repeating unit cell ***,most of the traditional techniques employed to manufacture bio-scaffolds do not result in uniform pore sizes and connectivities.A number of studies have shown that the bulk properties of such irregular structures are poorly modeled using idealized unit cell *** the periodic cell unit structures made by emerging rapid prototyping techniques would became irregular in vitro and in vivo environments as cell ingrowths and tissue formation ***,accurate modeling of bio-scaffolds with non-uniform cellular structures is very important for the development of optimal scaffolds for tissue engineering application.A number of studies will be shown which demonstrate the ease with which fidelic models of the complex micro-architectures of bio-scaffolds can be *** addition,studies will be presented which explore both fluid flow and bulk structural properties of a range of bio-scaffolds.

关键词： Bio-scaffolds,material characterization,finite element,computational fluid Dynamics,microstructures

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Solid Freeforming and Combinatorial Research at University of London

Solid Freeforming and Combinatorial Research at University o...

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第三届北京国际快速成形及制造会议暨第二届北京国际生物制造会议

作者： J.R.G.Evans Department of Chemistry University College London

A view of manufacturing processes is presented in which five distinct categories are defined;casting,deformation,machining,joining and solid *** freeforming is essentially biomimetic and shares problems of morphogenesis with natural *** team in University of London has been exploring three mechanisms of solid *** dry powder deposition and direct ink-jet printing,the emphasis has turned to the problem of delivering a complex shape in which the three dimensional spatial arrangement of composition is delivered from the design *** extrusion freeforming,the aim is to control microstructure at hierarchical levels also from the design *** quest for 3D functional gradients is satisfied by acoustic and ultrasonic dispensing and mixing of powders so that each layer can be *** methods could be extended to deliver the complex patterns demanded by left-handed microwave *** powder deposition and direct ink-jet printing are turning towards combinatorial methods in which multiple sample libraries are used to accelerate *** turn,this paves the way for 'Autonomous Research Machines' which steer their own search refinements in response to our requests for new *** this way,solid freeforming used for sample preparation can give an 'arm' to an intelligent machine so that it can conduct its own experimentation and learning;an idea that originated with Alan Turing in the late 1940s.

关键词： Solid Freeforming and Combinatorial Research at University of London

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