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Mesh theory of angle modified dual tori double-enveloping toroidal worm drive

Science China(Technological Sciences) 2010年第7期53卷 1913-1927页

作者： ZHAO YaPing1, SU DaiZhong2, ZHAng Zhao1, WEI WenJun3 & DOng XueZhu3 1 College of Machinery and Automation, Wuhan university of Science and Technology, Wuhan 430081, China 2 advanced design and manufacturing engineering center, nottingham trent university, nottingham ng1 4bu, uk 3 College of engineering, China Agricultural university, Beijing 100083, China 1. College of Machinery and Automation Wuhan University of Science and Technology Wuhan 430081 China2. Advanced Design and Manufacturing Engineering Center Nottingham Trent University Nottingham NG1 4BU UK3. College of Engineering China Agricultural University Beijing 100083 China

In this paper, the meshing theory of the angle modified hourglass worm drive is enriched and developed. The ordinary condition of the angle modification is derived and the physical significance of the modification is interpreted. A normal section methodology is proposed for meshing analysis, which can be used to compute the normal distance near a singular meshing point of a conjugate surface couple. By means of the method and after analyzing the normal transversals, it is specified that the worm helicoid, the nominal former contact zone and the new contact zone intersect each other along the locus of singular points of the instantaneous contact lines of an angle-modified worm pair. As a result, it is explained clearly that those three osculate each other but the osculations are different in degree. Moreover, the mechanism of removing the twice-contacted zone from the worm gear tooth surface is clarified and the reason of shortening the worm working length is also elucidated. With the help of the theory described in the present paper and the thorough and systematic research on the relevant meshing characteristics, the angle modified dual tori double-enveloping toroidal worm drive has been shown to be an excellent new-fashioned hourglass worm set.

关键词： hourglass worm angle modification double-enveloping osculation normal transversal

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Jetting-based bioprinting:process,dispense physics,and applications

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Bio-design and manufacturing 2024年第5期7卷 771-799页

作者： Wei Long ng Viktor Shkolnikov Singapore Centre for 3D Printing(SC3DP) School of Mechanical and Aerospace EngineeringNanyang Technological University(NTU)Singapore 639798Singapore HP Inc. Palo AltoCA 94304USA

Jetting-based bioprinting facilitates contactless drop-on-demand deposition of subnanoliter droplets at well-defined positions to control the spatial arrangement of cells,growth factors,drugs,and biomaterials in a highly automated layer-by-layer fabrication *** to its immense versatility,jetting-based bioprinting has been used for various applications,including tissue engineering and regenerative medicine,wound healing,and drug development.A lack of in-depth understanding exists in the processes that occur during jetting-based *** review paper will comprehensively discuss the physical considerations for bioinks and printing conditions used in jetting-based *** first present an overview of different jetting-based bioprinting techniques such as inkjet bioprinting,laser-induced forward transfer bioprinting,electrohydrodynamic jet bioprinting,acoustic bioprinting and microvalve ***,we provide an in-depth discussion of various considerations for bioink formulation relating to cell deposition,print chamber design,droplet formation and droplet ***,we highlight recent accomplishments in jetting-based *** present the advantages and challenges of each method,discuss considerations relating to cell viability and protein stability,and conclude by providing insights into future directions of jetting-based bioprinting.

关键词： 3D bioprinting Biofabrication Jetting-based Dispense physics Machine learning

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ADVANCEMENT IN MECHANICAL design RESEARCH

ADVANCEMENT IN MECHANICAL DESIGN RESEARCH

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第四届海内外青年设计与制造科学会议

作者： Dr Daizhong SuDepartment of Mechanical and manufacturing engineering The nottingham trent university burton Street nottingham ng1 4bu ukTel: +44 (0)115 8482306 Fax: +44 (0)115 9486506

＜正＞Mechanical design plays an essential role in engineering,and hence is an impertat research *** the Chairman of a forthcoming important international conference,the GTM’2000 to be held in July 2000,the author provides the latest information of the trend and development in Mechanical design based on the review of about 150 submissions to the *** mechanical design research conducted at the nottingham Tyrent university is also briefly presented in this paper,including intelligent hybrid system for design integration,Intemet-bhased collaboration,adaptive optimisation,3-D simulation and numerical analysis for worm gears,and others.

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Correction:Jetting-based bioprinting:process,dispense physics,and applications

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Bio-design and manufacturing 2024年第5期7卷 823-823页

The article Jetting-based bioprinting:process,dispense physics,and applications,written by Wei Long ng and Viktor Shkolnikov,was originally published electronically on the publisher’s internet portal on 12 July 2024 ... 详细信息

关键词： printing pens internet

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Research on Product Digital Collaborative design System

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厦门大学学报（自然科学版） 2002年第S1期41卷 219-220页

作者： ZHAO Xiu-xu, LUO Dan, LI Cun-rong, YAng Ming-zhong (School of Mechanical & Electrical engineering, Wuhan university of Technology, Wuhan 430070, China)

Network economy had changed manufacturing environme nt at all. Open global market offer more choice to customer, and it become changea ble and unpredictable as consumers’ needs become more and more characteristic an d diversified. Various new technology coming forth and application accelerate th e rapid change of the market. The manufacturing enterprises were compelled t o change their strategy by the variability of the market, and time has been put to the all-important place. There is a need driven by the market to set up a ne twork design and manufacturing mode which have rapid market responsiveness. In order to meet the need for network manufacturing, the organization and manage ment of manufacturing enterprise need a completely innovation, next generation o f manufacturing system must have the character such as digitization, flexibility , agility, customization and globalization and so on. As for an enterprise in au to industry, how to gather together the orders through the distribution, and rap id produce the product which can meet the customer’s need, it is the key that th e contemporary enterprises succeed in the competitive market. The competitive market requires rapid product development. Close cooperation amo ng the designers will accelerate the product development by shortening the devel opment cycle, improving the product quality and reducing the investment. It has been emphasized in the methodology of concurrent engineering (CE). but sometimes those partners are distributed in the world, so there is a need for an importan t technology contribution to collaborative engineering, and supporting distribut ed designers for rapid product development. This paper focuses on a collaborative design system: Product Digit Collaborative design System (PDCDS). The solution of PDCDS can make it more efficient and rel iable to visit teledata as well as we can get it from local database. It will be ease to get the newest design process information aided by PDCDS, and it

关键词： network manufacturing digital product developmen t collaborative product data management collaborative design system

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The Realization of Mass Customization Using Modularization Method

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厦门大学学报（自然科学版） 2002年第S1期41卷 244-页

作者： SU Ju-ning 1, YAng Shui-li 1, DOng Peng-fei 2 (1. School of business Administration, Xi’an university of Technology, Xi’an 710048, China 2. Jinduicheng Molybdenum Mining Corporation, Huaxian 714102, China)

In the view of the comparison of Mass Customization ( MC) with Mass Production and Customization Production, the objectives of MC are analyzed. It is pointed out that the core objectives of MC are to realize in dividuation customization, low cost, quick response to market demands. The modul arization theory is simply introduced. Based on the characteristics of modular ization, the mechanism of realizing MC with modularization is analyzed. The in dividuation customization can be realized with the different combinations of mod ules. The low cost can be realized with the scale economy and the category econo my of modules. The quick response can be realized with standard modules and its interfaces. So, the modularization is a kind of effective method in realizing MC . The modularization for MC is a systems engineering. With product modularized, production organization and management and manufacturing equipment will be chang ed. In addition, the paper also proposes a Mass Customization production model w hich is based on modularization. This Mass Customization production model is con sisted of modularization of product design, specialization of manufacturing, Vir tual Enterprises based on modularizing enterprises, and modularizing manufacturi ng equipment. The module design for MC, modularizing enterprises, and reconfigur able automation manufacturing equipment are discussed, and it is pointed out tha t they are the important supports for MC.

关键词： Mass Customization (MC) modularization module d esign modularizing enterprise reconfigurable automation manufacturing equipmen t

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Polyvinylpyrrolidone-based bioink:influence of bioink properties on printing performance and cell proliferation during inkjet-based bioprinting

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Bio-design and manufacturing 2023年第6期6卷 676-690页

作者： Wei Long ng Xi Huang Viktor Shkolnikov Ratima Suntornnond Wai Yee Yeong HP-NTU Digital manufacturing Corporate Lab Nanyang Technological University(NTU)Singapore 637460Singapore Singapore Centre for 3D Printing(SC3DP) School of Mechanical and Aerospace EngineeringNanyang Technological University(NTU)Singapore 639798Singapore HP Inc. Palo AltoCA 94304USA

Among the different bioprinting techniques,the drop-on-demand(DOD)jetting-based bioprinting approach facilitates contactless deposition of pico/nanoliter droplets ofmaterials and cells for optimal cell–matrix and cell–cell *** bioinks play a critical role in the bioprinting process,there is a poor understanding of the influence of bioink properties on printing performance(such as filament elongation,formation of satellite droplets,and droplet splashing)and cell health(cell viability and proliferation)during the DOD jetting-based bioprinting *** inert polyvinylpyrrolidone(PVP360,molecular weight=360 kDa)polymerwas used in this study to manipulate the physical properties of the bioinks and investigate the influence of bioink properties on printing performance and cell *** experimental results showed that a higher bioink viscoelasticity helps to stabilize droplet filaments before rupturing from the nozzle *** highly stretched droplet filament resulted in the formation of highly aligned“satellite droplets,”which minimized the displacement of the satellite droplets away from the predefined ***,a significant increase in the bioink viscosity facilitated droplet deposition on the wetted substrate surface in the absence of splashing and significantly improved the accuracy of the deposited main *** analysis showed that cell-laden bioinks with higher viscosity exhibited higher measured average cell viability(%),as the presence of polymer within the printed droplets provides an additional cushioning effect(higher energy dissipation)for the encapsulated cells during droplet impact on the substrate surface,improves the measured average cell viability even at higher droplet impact velocity and retains the proliferation capability of the printed *** the influence of bioink properties(e.g.,bioink viscoelasticity and viscosity)on printing performance and cell proliferation is important for the formulation

关键词： Biofabrication 3D bioprinting Drop-on-demand bioprinting Bioink properties Polyvinylpyrrolidone

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Computational design of structured chemical products

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Frontiers of Chemical Science and engineering 2021年第5期15卷 1033-1049页

作者： Faheem Mushtaq Xiang Zhang Ka Y.Fung Ka M.ng Department of Chemical and Biological engineering The Hong Kong University of Science and TechnologyHong KongChina

In chemical product design,the aim is to formulate a product with desired *** and internal product structure are two key drivers of product performance with direct impact on the mechanical,electrical,and thermal ***,there is a keen interest in elucidating the dependence of product performance on ingredients,structure,and the manufacturing process to form the *** of product structure,particularly microstructure,is an intrinsically complex problem that involves different phases of different physicochemical properties,mass fraction,morphology,size distribution,and ***,computational methods have emerged that assist systematic microstructure quantification and *** objective of this paper is to review these computational methods and to show how these methods as well as other developments in product design can work seamlessly in a proposed performance,ingredients,structure,and manufacturing process framework for the design of structured chemical *** begins with the desired target properties and key *** is followed by computation for microstructure and then selection of processing steps to realize this *** framework is illustrated with the design of nanodielectric and die attach adhesive products.

关键词： product design performance ingredients structure manufacturing process framework structured chemical products microstructure design

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Additive manufacturing of high-entropy alloys by thermophysical calculations and in situ alloying

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Journal of Materials Science & Technology 2021年第35期94卷 53-66页

作者： Mehmet Cagirici Pan Wang Fern Lan ng Mui Ling Sharon Nai Jun Ding Jun Wei Singapore Institute of manufacturing Technology 73 Nanyang Drive637662Singapore Department of Materials Science and engineering National University of Singapore117576Singapore

Electron beam melting(EBM)is a promising technology to manufacture various alloys with outstanding properties;however,the number of available alloys is *** propose in situ alloying to accelerate the development of advanced and novel alloys,based on thermophysical calculations and CALPHAD approach,during the EBM *** demonstrate our concept through the design and fabrication of high entropy alloys(HEAs).Three CoCrFeNiMn-xTi(x=0.18,0.50,2.00,in molar%)HEAs are ***-built HEAs achieve a homogeneous distribution of elements while forming multiphase alloys resulted from the hot powder *** topological structures formed by secondary phases contribute to an increase in the hardness of EBM-built HEAs up to 900 *** alloy design,a systematic analysis on Co Cr Fe Ni Mn-0.18 Ti HEA elucidates the microstructural evolution in *** findings provide a deep understanding of in situ alloying and pave the way to develop new alloys specific to the EBM process.

关键词： 3D printing Cost reduction Electron beam melting High entropy alloy Mechanical properties Phase prediction

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The Development of Gear Pump CAD/CAPP Based on Solid Works

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厦门大学学报（自然科学版） 2002年第S1期41卷 145-147页

作者： ZHOU Feng, LIU Yuan-wei (Dept. of Mechanical engineering, Huaiyin Institute of Technology, Hua ian 223001, China)

Nowadays, many kinds of software, which have succes sf ully created the integration of CAD, CAPP and CAM, find their disadvantages in p ractical manufacturing. As a result, it is welcomed to develop small CAD/CAPP sy stems on a proper CAD platform, which aim at requirements of factories. Based on the one of the most popular three-dimensional design software SolidWorks, we successfully developed a set of gear pump CAD /CAPP software for Huaiyin Gene ral Factory of Mechanics. 1 The architecture and function of the software According to the need of the enterprises, the general structure of the software contain two subsystems, which are detailed as follows: · The gear pump CAD subsystem contains four main modules, including the optiona l design module of gear pump, module of part design, the module of entity modeli ng and the module of drawing which creates 2 D drawings of parts and assembly c orresponding 3 D modals. · The gear pump CAPP subsystem, which is a combination of creative mode and der ivate mode, also includes four modules, they are the module of access to feature s, the module of planning process route, the module of designing process sheets and the module of generating process documents. 2 The developing environment of the system Basing on Windows 98 and SolidWorks2001 platform, this system creates all functi ons by using Visual C++ 6.0 as developing tools. 3 The keys to the CAD/CAPP integration 3.1 The establishment of product information modal The information of parts is the basis of process planning. In this system, we us e feature modeling to describe the information of parts and assembly of gear pum p, and set up a fundamental basis for the whole system. The information module o f gear pump includes the information of both the assembly and the parts; the par t-describing module uses four-layer structure that is subassembly layer, part layer, feature layer and geometric layer. 3.2 The operation of the information on feature modeling After establishment

关键词： CAPP CAD The Development of Gear Pump CAD/CAPP Based on Solid Works

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