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ѵ101ƪ

cƵĿԭgо
dՓȫՈc朽
ע⣺ՓڡCе̌W2003,39(1):56-5983l
ʹՈעՓij̎
O ZԪ
(BWF켼gоB1 16024)
Խ ܊
(ЇƌWԺCˌW_о)

ժ Ҫ: ᘌκ͎ؓ׺ϢƠSؽ}ˌcֱMз֌̎ԭ͵·ڌcMпgYֵĻAСxP“cȡ݆Ԅ򻯺;ĶֱɿٳΙCČƬӿļ˳ҎڵĺĕrҪܸߵͼɵȲƬe`УcaȷҲM˿ٳǰ̎ЧdzmϷ֌ӌw죨LOMȳιˇ
PI~: 󹤳 cƔ ֱӷ֌ ԭͼg

RAPID PROTOTYPING MANUFACTURING BASED ON CLOUD DATA FROM FREE-FORM SURFACE

SunYuwen Jin Zhenyuan
(Dalian University ofTechnology)
Wang Yuechao Liu Weijun
(Robotics Laboratory,Chinese Academy ofScience)

Abstract: Physical model recovered from cloud dada only with coordinate information is of great importance in the integration of reverse engineering and rapid prototyping technology. A new method, that rapidly generates prototype from sampled points, is proposed. Based on establishing the spatial partitioning representation of point cloud, the contour data in each layer is firstly calculated and sequenced, then amended to generate exact slice file. It overcomes lots of drawbacks in traditional integration such as consuming time and needing expert modeling skills. Moreover, without the intermediate transactions of STL file, the work of checking and repairing mistakes of facets is avoided. It is very suitable for laminated object manufacturing and greatly improves the pretreatment efficiency of RP technology.
Keywords: Reverse engineering Data cloud Direct slicing Rapid prototyping


ѵ102ƪ

ʸĔؼӹ܉EOӋо
dՓȫՈc朽
ע⣺ՓڡCе̌W2005,41(3):160-164170l
ʹՈעՓij̎
O L
(BWcطNӹcҴB116023)

ժ Ҫ: ˻ʸNURBSĔؼӹ܉EOӋ?ԍ\ӹ~䲆|ϵχIߵ^򼯺?cݶȈDPϵ,˾_ƽxɢʸߵʸMģ,ɴ˽o˔ؼӹ܉Eʸ_ʽNURBSlʸ^ľֲ{,ͨ^{c,Fؼӹ܉EؓΠw{Cԓ܉MЏsΠؼӹ܉EľOӋ,ڱCָӹЧʵ
PI~: ӹ܉E ʸ NURBS

VECTOR ANALYSIS BASED TOOLPATH GENERATION FOR PRECISION SURFACE MACHINING

Sun Yuwen Shu Changlin Liu Jian
(Key Laboratory for Precision & Non-traditional Machining ofMinistry of Education, Dalian University of Technology, Dalian 116023)

Abstract:A toolpath generation method is presented for NC machining based on vector analysis and NURBS. Given optimal cutting directions at sampled points in the parameter domain of the NURBS surface, a vector field model fitting to these scattered vectors is established according to the conversion between scalar field and gradient field. Thus, tool paths inthe parameter domain can be represented as vector curves of a 2D vector field. Moreover, using NURBS as the stream function of generating gradient field, a global shape optimization of tool-paths can be easily completed by adjusting the control point array of the stream function. The example shows that theprecise design method of tool paths is very useful in high- efficiency machining of complex shapes.
Keywords: Tool paths Vector field NURBS


ѵ103ƪ

Ї|ȼҴĿaЧu
dՓȫՈc朽
ע⣺ՓڡrǏW2005,21(11):121-123l
ʹՈעՓij̎

EI ѽ䛱ģ
1s2ֹ1ɠc1
1ϺͨWCеčWԺϺ 200030
2ϺͨWrIcWԺϺ 201101

ժ Ҫˌ׺ľҴͿaЧMuԓĽyӋ׺ľҴܺЈrֵaƷܺM˷Ӌ׺ľȼҴă̓Ӌˆήaͻ׃ră̓׃ӋY@ʾľҴăքe1.472 MJ/L2.417 MJ/Lքe1.474 MJ/L2.459 MJ/LʹľaȼҴaa϶ǿеľҴҴԸήaͻԴúԴPIӏaƷ_lʹЙCʴ滯ϵyЧϵyĿ
PI~ȼҴԴ
ЈD̖S216.2 īIʾaA

Evaluation on Energy Production Efficiency of Biomass based Fuel Ethanol Program
Dai Du1, Liu Ronghou2, Pu Gengqiang1, Wang Chengtao1
(1 School of Mechanical and Power Engineering, Shanghai Jiaotong University, Shanghai 200030, China; 2 School of Agriculture and Biology, Shanghai Jiaotong University, Shanghai 201101, China)

Abstract: To assess corn and cassava fuel ethanol production energy efficiency, this paper estimates life cycle energy consumption of corn and cassava fuel ethanol, allocates energy uses between fuel ethanol and its byproducts, and finally, works out net energy value (NEV) and net renewable energy (NREV). It also gives NEV and NREV results of corn and cassava under changed yields and chemicals uses. The results show that NEV of corn and cassava ethanol are 1.472 MJ/L and 2.417 MJ/L, respectively, and NREV of corn and cassava ethanol are 1.474 MJ/L and 2.459 MJ/L, respectively. Corn and cassava ethanol utilization are energy and renewable energy feasible, and cassava ethanol has better feasibility than corn ethanol. Yield and chemicals use are key factors to improve NEV and NREV. Better byproducts utilization and substitution of organic fertilizer for chemical fertilizer help to improve energy efficiency and renewability
Keywords: fuel ethanol; net energy; renewable energy


ѵ104ƪ

Energy efficiency and potentials of cassava fuel ethanol in Guangxi region of China
dӢZՓȫՈc朽
ע⣺ՓEnergy Conversion and Management 47 (2006) 1686C1699l
ʹՈעՓij̎

SCIEI ѽ䛱ģ
Du Dai a, Zhiyuan Hu b, Gengqiang Pu a, He Li c, Chengtao Wang a
a School of Mechanical and Power Engineering, Shanghai Jiao Tong University, Shanghai 200030, PR China
b Automobile School, Tongji University, Shanghai 200092, PR China
c Hi-tech Development Division, Guangxi Development Planning Committee, Nanning 530012, PR China

Abstract: The Guangxi Zhuang autonomous region has plentiful cassava resources, which is an ideal feedstock for fuel ethanol production. The Guangxi government intends to promote cassava fuel ethanol as a substitute for gasoline. The purpose of this study was to quantify the energy efficiency and potentials of a cassava fuel ethanol project in the Guangxi region based on a 100 thousand ton fuel ethanol demonstration plant at Qinzhou of Guangxi. The net energy value (NEV) and net renewable energy value (NREV) are presented to assess the energy and renewable energy efficiency of the cassava fuel ethanol system during its life cycle. The cassava fuel ethanol system was divided into five subsystems including the cassava plantation/treatment, ethanol conversion, denaturing, refueling and transportation. All the energy and energy related materials inputs to each subsystem were estimated at the primary energy level. The total energy inputs were allocated between the fuel ethanol and its coproducts with market value and replacement value methods. Available lands for a cassava plantation were investigated and estimated. The results showed that the cassava fuel ethanol system was energy and renewable energy efficient as indicated by positive NEV and NREV values that were 7.475 MJ/L and 7.881 MJ/L, respectively. Cassava fuel ethanol production helps to convert the non-liquid fuel into fuel ethanol that can be used for transportation. Through fuel ethanol production, one Joule of petroleum fuel, plus other forms of energy inputs such as coal, can produce 9.8 J of fuel ethanol. Cassava fuel ethanol can substitute for gasoline and reduce oil imports. With the cassava output in 2003, it can substitute for 166.107 million liters of gasoline. With the cassava output potential, it can substitute for 618.162 million liters of gasoline. Cassava fuel ethanol is more energy efficient than gasoline, diesel fuel and corn fuel ethanol but less efficient than biodiesel.
Keywords: Cassava; Net energy; Renewable energy; Fuel ethanol


ѵ105ƪ

ڻģ͵E10ȼu
dՓȫՈc朽
ע⣺ՓڡϺͨWW2006,40(2):355-358l
ʹՈעՓij̎
EIѽ䛱ģ
SȻֹɠc
ϺͨW CеčWԺ Ϻ 200030

ժ ҪҎ^ʽuӋЕؔ`uY͹ͶaԱؔ`ĮaaƷڵʹAˌE10ȼϵMuĽһuģ|aҴa/ԼU̎/3^̲Ͷauȼȼ^̲^ʽuɷNŷֵMӋE10ȼVOCCONOXPM10SOXCH4N2OCO2ŷֵքe21.245321.48826.8293.1105.9049.1263.02831345.721 g/kgԓYc^ʽuYһ
PI~E10ȼͶa|
ЈD̖TK6 īIRaA

E10 Fuel Life Cycle Assessment Based on Hybrid Model
DAI Du, YU Sui-ran, PU Geng-qiang, WANG Cheng-tao
(School of Mechanical Eng., Shanghai Jiaotong Univ., Shanghai 200030, P.R.China)

Abstract: Truncation error occurs in process life cycle assessment (PLCA), which makes underestimation of assessment results. Economic input-output assessment (EIOLCA) can avoid truncation error but excludes use stage of life cycle. To assessing life cycle of E10 fuel. A hybrid assessment model for life cycle of E10 fuel is established. EIOLCA method is used for sub processes of biomass production, ethanol production/mixing and dispose/recycle, and PLCA method is used for sub process of combustion. Through aggregating, the life cycle emission results shows that emission of VOC, CO, NOX, PM10, SOX, CH4, N2O, CO2 are 21.245, 321.488, 26.829, 3.110, 5.904, 9.126, 3.028, 31345.721 gram per kilogram ethanol output, respectively. These results are consistent to results with PLCA method.
Keywords: life cycle; E10 fuel; input-output; biomass


ѵ106ƪ

Fabrication of enclosed nanochannels in poly(methylmethacrylate) using proton beam writing and thermal bonding
dӢՓȫՈc朽

ע⣺ՓAPPLIED PHYSICS LETTERS 88, 0935152006l
ʹՈעՓij̎

P. E. Shao(), A. van Kan, L. P. Wang, K. Ansari, A. A. Bettiol, and F. Watt
Center for Ion Beam Applications (CIBA), Physics Department, National University of Singapore,
2 Science Drive 3, Singapore 117542, Singapore

Abstract: We report a technique for fabricating enclosed nanochannels in polymethylmethacrylatePMMA using proton beam writing coupled with thermal bonding. Using proton beam writing, straight-walled high-aspect-ratio channels can be directly fabricated through a relatively thick PMMA resist layer spin coated on a Kapton film. By thermally bonding the fabricated structures onto bulk PMMA, peeling off the Kapton substrate, and bonding the remaining exposed side to PMMA, enclosed high-aspect-ratio nano/microchannels can be fabricated. Such enclosed channels can be incorporated into fluidic polymeric devices, and the process is compatible with the fabrication of multilevel three-dimensional fluidic chips with vertical interconnects.


ѵ107ƪ

^ʽgӷՓо
dՓȫՈc朽
ע⣺ՓڡAWW󡷣ȻƌW棩2003,4(1):84-88l
ʹՈעՓij̎
1,2,ʯ1
(1.BWľWԺ,|B116023;
2.ʡtʯ֘I,֘顡132024)

ժ ҪժҪ:ڴλƷǾԏՓďVx׃ԭ,]˼ӄS򉺿s׃ܺͼБ׃ܵӰ,^ʽgӵĴλƲȫVxܷ,ͨ^s׃֌^ʽQMvӼŤDӵĻA΢ַ,^ʽĹԠṩɿՓ.
PI~:^ʽ;;;;Vx׃
D̖:U448.25īIRa:??br>

The oretical Study on Space Coupling Free Vibration Analysis of Self-anchored Suspension Bridge
Liu Chuncheng1, Guo Liwen2, Shi Lei1
(1.Institute of Civil Engineering and Architecture of Dalian University of Technology, Dalian, 116023, China
2.Hongshi Forestry Bureau in Jinlin Province, 132024, China)

Abstract: Based on the generalized potential energy variational principal of nonlinear elasticity theory with large deflection, the incomplete generalized potential energy functional with large deflection is established on the space coupling free vibration of three-span self-anchored suspension bridge by considering the effect of axial compressive and shearing strain energy of stiffening girder. By constraint variation, the differential equations of vertical vibration, later vibration, longitudinal vibration and torsional vibration have been derived. It can provide the theoretical basis for the analysis of free vibration of self-anchored suspension bridge.
Keywords: Self-anchored; Coupling; Free vibration; Function; Generalized variation


ѵ108ƪ

Ч^ʽо
dՓȫՈc朽

ע⣺ՓڡIIWW2004,36(1):109-111l
ʹՈעՓij̎
EIѽ䛱ģ
[1][2] [1] ʯ[1]
( [1]BWо|,B 116023
[2]AWͨWԺ, 132013)

ժ ҪڴλƷǾԏՓďVx׃ֺ]˼ӄĉϺͼБ׃ܵӰ^ʽgӵĴλƲȫVxܷͨ^s׃֌^ʽQMӺͿvӵĻA΢ַԷǾ헵ӰMõ΢ַ̣һM^ʽQӷlʵĽcֵ˱^C@һՓͷ^ʽĹԷṩɿ
PI~^ʽ
ЈD̖U44255 īIRaA

Free vibration analysis of self-anchored suspension bridges subjected to axial and flexural action efect
LIU Chuncheng1,2ZHANG Zhe1 SHI Lei1
(1Bridg,-InstituteDalian University ofTechnologyDalian 116023China
2School of Transportation and ArchitectureBeihua UniversityJilin 132013China)

Abstract: Based on the generalized potential energy variational principle of nonlinear elasticity theory with large deflectionthe incomplete generalized potential energy functional is established on the space coupling free vibration of three-span self-anchored suspension bridge by considering the effect of coupling of flexural and axial actionand shearing strain energy of stifening girderBy constraint variationthe diferential equa tions of vertical vibrationlateral vibration and longitudinal vibration have been derivedWith the nonlinear items disregardedthe linear differential equations are establishedA self-anchored suspension bridge being constructed is taken as an example for the solution of frequency of linear vertical vibrationand the results are verified by comparing then with those obtained using the numerical methodsand theoretical basis is therefore provided for the analysis of free vibration of selfanchored suspension bridges
Keywords: self-anchored suspension bridge; coupling of flexural and axial action; free vibration


ѵ109ƪ

ɼģxģͼǽYģQՓژxеđ
dՓȫՈc朽

ע⣺Փڡ·ͨƼ2004,21(7):79-82l
ʹՈעՓij̎

,I,S,ʯ
(BWо,|B116023)

ժ ҪxOӋ,漰T,@ЩijЩr,ijЩr˅f{@ЩsPϵ,˞صӰ,ɼģxģͼǽYģQՓ\ôģ,MһOӋx̓,õ˱^ĽY,C˴ģژxеČ
PI~:ģx;ǽYģQ;x
ЈD̖:442 5īIRa:

Two-extreme fuzzy optimum model and non-structural fuzzy decision theory applying to bridge type selection

Wang Hui-li, Li Hai-bin, Huang Cai-liang, Shi Lei
(The Bridge Science Resaerch Institute, Dalian University of Technology, Liaoning Dalian 116023,China)

Abstract: Several factors influence type selection of bridge. Some are consistent, others are inconsistent. In order to harmonize the relations among the factors and decrease the subjective influence, the two-extreme fuzzy optimum model and non-structural fuzzy decision theory are introduced. The method of fuzzy optimum decision has been successfully used in an example of type selection of a bridge, which includes four design projects.
Key words: Fuzzy optimum decision; Non-structural fuzzy decision; Type selection of bridge


ѵ110ƪ

֧м^ʽg𷴑
dՓȫՈc朽
ע⣺ՓڡIIWW 2004,36(11):1568-1570l
ʹՈעՓij̎
EIѽ䛱ģ
1,2 1 ʯ1
(1.BWо,|B116023
2.AW ͨWԺ 132013)

ժ ҪSCՓ]˵ӿgЧһ240^ʽڶ֧мM˵𷴑Լڵ𲨵ú“µĵ𷴑M˔ֵӋ̽ӑвЧͲЧ^ʽ𷴑Ӱ푣
PI~:֧м ^ʽ 𷴑

Spatial seismic response analysis of self-anchored suspension bridges subjected to multiple-support excitations

Liu Chun-cheng1,2, Zhang Zhe1, Shi Lei1
(1.Bridge Science Resaerch Institute, Dalian University of Technology, Liaoning Dalian 116023,China
2.School of Transportation and Architecture, Beihua University, Jilin 132013, China)

Abstract: Based on random vibration theory, by taking into account the seismic action with spatial variation, the earthquake respons of a self-anchored suspension bridge with center span of 240m to multiple-support excitation is investigated, and numerical calculation is presented for seismic response of self-anchored suspension bridge by considering traveling effect and correctated effect is discussed in detail.
Key words: multiple-support excitations; self-anchored suspension bridge; earthquake reponse


ѵ111ƪ

Darboux Transformation and Soliton-like Solutions for a Generalized q-KdV Hierarchy
dӢZՓȫՈc朽
ע⣺ՓJournal of the Physical Society of JapanVol. 73, No. 11, November, 2004, pp. 2991C2995l
ʹՈעՓij̎

Engui FANF
Institute of Mathematics and Key Lab for Nonlinear Mathematical Models and Methods,
Fudan University, Shanghai 200433, P. R. China
(Received July 5, 2004)

Abstract:By introducing a q-deformed spectral problem, we derive a new generalized q-KdV hierarchy with variable coefficients. Darboux matrix technique is further extended to construct an explicit and universal Darboux transformation for the q-KdV hierarchy. It is found that the Darboux transformation admits a theorem of permutability theorem and a superposition formula. In particular, the soliton-like solutions whose speeds may depend on time variable t are obtained by applying the Darboux transformation and superposition formula.
KEYWORDS: generalized q-KdV hierarchy, Darboux transformation, theorem of permutability, soliton-like solution


ѵ112ƪ

An algebro-geometric solution for a Hamiltonian system with application to dispersive long wave equation
dӢՓȫՈc朽
ע⣺ՓJOURNAL OF MATHEMATICAL PHYSICS 46, 032701, 2005:1-21l
ʹՈעՓij̎

Y. C. Hon(a)
Department of Mathematics, City University of Hong Kong, Hong Kong SAR, Peoples Republic of China
E. G. Fan(b) (F)
Institute of Mathematics, Fudan University, Shanghai 200433, Peoples Republic of China
(Received 14 October 2003; accepted 3 December 2004; published online 8 February 2005)

Abstract:By using an iterative algebraic method, we derive from a spectral problem a hierarchy of nonlinear evolution equations associated with dispersive long wave equation. It is shown that the hierarchy is integrable in Liouville sense and possesses bi-Hamiltonian structure. Two commutators, with zero curvature and Lax representations,for the hierarchy are constructed, respectively, by using two different systematic methods. Under a Bargmann constraint the spectral is nonlinearized to a completely integrable finite dimensional Hamiltonian system. By introducing the AbelCJacobi coordinates, an algebro-geometric solution for the dispersive long wave equation is derived by resorting to the Riemann theta function.


ѵ113ƪ

b亯܇̓Mb
dՓȫՈc朽
ע⣺ՓڡCһw2004,10(5):42-45l
ʹՈעՓij̎

, , ۡx
ϺWCIMS͙C Ϻ 200072

ժҪ̓Mb̓MPIg֮һb^̷njFaƷ̓MbһҪhڷ̓MCb^̵ĻAһNC̓MbZԼ̓Mb亯ČF@NZ܉ʹCgˆTֱ^ݵķ팍F̓MCbͨ^CԓgЧ
PI~b亯 ̓Mb b Z

Virtual Assembly of Lathe Based on Assembly Function
Zhou LiboTian Zhongxu, Di Yi
(CIMS & Robot Center, Shanghai University, Shanghai, China, 200072)

AbstractVirtual assembly is one of the key technologies of virtual manufacture, and animation and simulation module of assembly process is an important link to realize product virtual assemble. Based on analyzing the process of simulation of machine assemblythe realization of a language and virtual assembly function, which describes simulation of machine assembly is introduced,Machine technician can use this language to show the assembly expedientlyand an example is given to show the validity of the technology.
Keywords: assembly function; virtual assembly; assembly simulation; description language


ѵ114ƪ

A New Routing Algorithm of Two-tier LEO/MEO Mobile Satellite Communication Systems
dՓȫՈc朽
ע⣺Փ2005 Asia-Pacific Conference on Communications, Perth, Western Australia, 3 - 5 October 2005.l
ʹՈעՓij̎

Wu Di, Li Qing
(Dept. of Computer Science Dalian University of Technology Liaoning, China, 116024)

Abstract:The performance of a two-tier LEO/MEO satellite network including inter-satellite links (ISLs) is analyzed. Specific emphasis is laid on the design of an ATM-based routing scheme for the ISL part of the system (MEO layer). The approach is to prepare a virtual topology by means of virtual path connections (VPCs) connecting all pairs of end nodes in the ISL sub-network for a complete period in advance, similar to implementing a set of (time dependent) routing tables. The search for available end-to-end routes within the ISL network is based on a new routing Algorithm (S-DRA) integrates the advantages of Static Routing and Dynamic Routing. Additionally, a new quick clustering scheme is introduced to monitor the faults to guarantee the usability of VPC. The new algorithm guarantees that: 1) the survey of VPC route is not carried on blindly no longer because of the application of the clustering scheme, 2) the flow of control information is reduced, 3) whereas the channel of link is allowable, it can reduce handover frequency as much as possible. Finally, a simulation on MEO layer analyzes the performance of the new routing algorithm.
Index Terms--satellite network, ISLs, routing algorithm


ѵ115ƪ

saƷ_lзо
dՓȫՈc朽
ע⣺ՓڡЇCе̡2005,.16(17):1536-1540l
ʹՈעՓij̎
؆1 2 nX3 1
1ϺWϺ200072
2ϺؔWϺ200433
3ƼW100083

ժҪÈDՓп_ꇵ|cԭ팦aƷ_lӵĽMʽ˶,FaƷ_lӵİ^򄝷,Ķ_Ӱ푮aƷ_l^еҪ·PIh;ͨ^aƷ_l·mrgøʵķо,鲢ЮaƷ_l^̵ĽM͌ʩṩQ.
PI~saƷ;΄շֽ;;_l^;PI·
̖TH16;TP399
¾̖1004-132X(2005)17-1536-05


Research on Analysis Method of Development Activity Sequences for Intricate Products

Cao Shouqi1 Chen Yun2 Han Yanling3 Fang Minglun1
1Shanghai UniversityShanghai200072
2Shanghai University of Finance&EconomicsShanghai200433
3University of Science and Technology BeijingBeijing100083

Abstract:Research on Analysis Method of Development Activity Sequences for Intricate ProductsAbstract:This paper made quantitative analyses to activity sequences and organization schema of production development with the principle of reachability matrix in graphics theory, realized division according to activity zone of product development, and effects on primary route and critical juncture of development definitely. By researches on time duration and action probability of product development, we provided the decision-making reliance for organization and execution of development routes.
Key words:intricate product; task decomposition; activity sequence; development process; critical path


ѵ116ƪ

ڼsďsaƷ_l^c·
dՓȫՈc朽
ע⣺ՓڡCеƌWcg 2005,.24(12):1391-1395l
ʹՈעՓij̎

؆1 2 nX1 1
1ϺWϺ200072
2ϺؔWϺ200433

ժҪ錍FڲͬAͬӴκͅ^ͿƮaƷ_l΢^^̵Ŀ,һN"ԽM-M"ՓҎOӋaƷ_l^̵ķ.^̵΄շ֌ӷֽͻڼsĮaƷ_lӽM^̱_,c^PļsӰ,ͨ^cg߉݋BȡֵʁӳwF;ÈDՓп_|cԭaƷ_lмM·,FaƷ_l^^̹΢^^̿ƵЙCY,ʹaƷ_lӵĽMʽBݻ͹ʼK̎͸Ϳɿصĭh^ͷ,ĿˆT_Ӱ푮aƷ_l^̵Ҫ·PIh,˷yC϶ҪԽ^̽ģͷy.
PI~ԽM;΄շֽ;;s;PI·
̖TH16;TP399 īIRaA
¾̖1003-8728(2005)12-1391-05

Analysis of Complicated Product Development Process and its Activity Line Based on Restraint

Cao Shouqi1 Chen Yun2 Han Yanling1 Fang Minglun1
1Shanghai UniversityShanghai200072
2Shanghai University of Finance&EconomicsShanghai200433


Abstract:Analysis of Complicated Product Development Process and its Activity Line Based on RestraintCao Shouqi,Chen Yun, Han Yanling, Fang Minglun 1. CIMS and Robot Center, Shanghai University, Shanghai 200072; 2. Shanghai University of Finance and Economics, Shanghai 200433Abstract:In order to realize the purposes of analyzing and controlling micro-processes of product development according to different levels and regions in different phases, a planning and design method of the product development processes is put forward on the basis of self-organizing and organized methodology. In the process of stratifcation and decomposition of task and product development based on restraint, the influence and restraint factors in connection with the processes are reflected and embodied by logic state and evaluation probability. By applying quality and principle of reachability matrix in graphics theory, activity sequence and its route of product development are analyzed quantitatively; macroscopic process management and microcosmic process control of product development are realized, and the organization mode, state evolution and work flow of product development activities are observed and analyzed under a transparent and controllable environment all the time. All these help project managers to know about the primary route and key point juncture of product development processes and overcome the difficulty of traditional methods in the way .of modeling and analysis by synthesizing multiple elements and crossing entire processes.
Key words:self-organizing; task decomposition ; activity sequence; restraint ; critical path


ѵ117ƪ

Ǿ|IJOӋ
dՓȫՈc朽
[1] ꐿ[2] T[3]
[1]BFWԺCеϵ|B116028
[2]۴WCеϵ 
[3]BWCеWԺ|B116024

ժҪU˷Ǿ|OӋĔWģ`ȷԼ½υ^IJMOӋõѲ܅ُķǾ|ϔҵĹ̲ϳɝMOӋҪķǾ|ԓOӋṩЌеķǾ|IJOӋ
PI~Ǿ| OӋ Wģ `ȷ ½
̖:TH140.8

Material Design of Heterogeneous Components

ZHANG Xiujuan CHEN Kezhang FENG Xinan
(1Deptof Mechanical EngineeringDalian Railway InstituteDalian 116028 China2Deptof Mechanical EngineeringThe University of Hong KongHong Kong3Deptof Mechanical EngineeringDalian University of TechnologyDalian 1 16024 China)


Abstract:TMs paper presents the mathematical mod el for the optimization of heterogeneous components I an d the method using sensitivity analysis and steepest descent method to optimize material propertiesthe component is then identifiedAfter searching for the materials from heterogeneous material database according to the corresponding optimum material data and combining the heterogene- OUS compo nentsthe material is synthetizedTo designerthis method is feasible and effective for the material design of heterogene-
OUS compo nents
Key words:heterogeneous componentsmathema~cal modelsensitivity analysis and optimizationsteepest descent method


ѵ118ƪ

ĸcPIg
dՓȫՈc朽
ע⣺ՓڡF칤̡ 2005,9:106-109l
ʹՈעՓij̎


BͨWCе̌WԺ,|B116028

ժҪUĻcȺȫBPIg͑İlչڅ
PI~ cȺ PIg lչڅ

Concepts and key technique of digital manufacturing

ZHANG Xiujuan CHEN Kezhang FENG Xinan
(1Deptof Mechanical EngineeringDalian Railway InstituteDalian 116028 China2Deptof Mechanical EngineeringThe University of Hong KongHong Kong3Deptof Mechanical EngineeringDalian University of TechnologyDalian 1 16024 China)


Abstract:The concept and connotation of digital manufacturing are introduced. Key techniques and applications of digital manufacturing are described. The development trend of digital manufacturing is put forward lastly.
Key words:Digital manufacturing Concept and connotation Key techniques Development trend



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ע⣺Փ Cе̌W(İ))2006,42(8):84-88,94l
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1. BWcطNӹc B 116024;
2. ЇƌWԺԄӻо 110016

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PARAMETRIC METHOD FOR KINEMATIC PATH GENERATION FROM MANIFOLD MESHES

un Yuwen1 Wang Haixia1 Liu Weijun2
Wang Yuechao2
(1. Key Laboratory for Precision & Non-traditional Machining of Ministry of Education, Dalian University of Technology, Dalian 116024;
2. Shenyang Institute of Automation, Chinese Academy of Science, Shenyang 110016 )


Abstract:Triangular mesh surface has gained wide applications in industrial field. However, the tool path generation methods for polyhedral machining are very limited and the iso-plane method is still the common used method. A conformal map based iso-parametric method for kinematic path generation is proposed. Through establishing the parametric relations between the triangular meshes embedded in the 3D space and the rectangular or circular region on the 2D plane, the Zigzag or contour paths are finally implemented by inversely mapping the planar iso-parametric paths into the physical space. Also, the issues of CC point and side interval calculation as well as interference detection are discussed in detail. The results show that the proposed method is boundary-conformed and can improve machining dynamics and efficiency greatly.
Key words:Triangular mesh, Conformal map, Tool path, Accessibility analysis


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SKIN-CORE STRUCTURE IN MESOPHASE PITCH-BASED CARBON FIBERS: CAUSES AND PREVENTION
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ע⣺ՓCarbon, Vol. 36, No. 12, pp. 1719C1724, 1998l
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YONG-GEN LU() ,a,* DONG WU,b QING-FANG ZHA,a LANG LIU a and
CHANG-LING YANGa
a.Institute of Coal Chemistry, Chinese Academy of Sciences, Shanxi, 030001 Taiyuan,
Peoples Republic of China
b.Department of Chemical Engineering, Taiyuan University of Science and Technology, Shanxi,
030001 Taiyuan, Peoples Republic of China


Abstract:To prohibit skin-core structure from appearing in mesophase pitch based carbon fiber (CF) with a large diameter (30C50 mm), measures such as decreasing oxidation temperature, prolonging holding time and increasing the oxygen partial pressure in the oxidative atmosphere were taken. EPMA (electron probe X-ray micro-analyzer) was utilized to detect the oxygen content distribution along the diameter of oxidized pitch fiber (OF). The transverse structure of OFs and CFs was observed under a scanning electron microscope (SEM). It was found with certainty that the skin-core structure in CFs is caused by steep oxygen content gradient along the diameter of their OFs. The oxygen distribution in
OFs was controlled by the oxidative stabilization conditions. In this work, the CF whose precursor fiber had been oxidized at 240C in a flow of pure oxygen for 10 hours exhibits no skin-core structure and possesses a high tensile strength. The kinetics of stabilization was also studied. It can be concluded that those factors which increase oxygen diffusion or depress oxidative reaction are effective in overcoming skin-core structure in CFs. ? 1998 Elsevier Science Ltd. All rights reserved.
Key words:A. Carbon fibers, mesphase, B. EPMA, D. Diffusion.


 

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