bluuebunny/crossref_metadata_2025 huggingface dataset:
Modeling and Experimental Study on Grid-Connected Inverter for Direct Drive Wind Turbine
Authors: Zhou La Wu , Shi Shu Qi , Li Li
Published: July 2011

This paper designs a dual topological structure of grid-connected inverter for high-power wind turbine, and introduces PWM converter's operational state. It establishes mathematical model of grid-side converter for wind turbine, then it puts forward the dual closed-loop vector control strategy of grid-side converter based on dq coordinate. The combination of the dual topological structure and decoupling control realize the functioning of high-power factor and two-way transmission of energy. Grid-side converter can stabilize DC side voltage during rapidly changed wind velocity which led to changes of output power in generator. Active or reactive output current can be adjusted independently. The hardware experiments and simulation results verify the feasibility of the proposed control scheme in both the high stability accuracy and excellent property of grid-connected.
Comparisons of Finite Element Models of Bonded Bonded Joints
Authors: He Xiao Cong
Published: July 2011

Thispaperdealswithcomparisonsoffiniteelementmodelsofadhesivelybondedjoints. Inordertoincreasetheaccuracyoftheresults,fivelayersofsolidelementswereusedacrossthe adhesivelayerwhichwasonly0.05mminthickness.Thefiniteelementswererefinedgraduallyin steps from adherends to adhesive layer. In these models, most regions of the adherends and adhesiveweremodelledusingsolidbrickelementsbutsomesolidtriangularprismelementswere usedforasmoothtransition.Insomeofthemodels,linearinterpolationelementsoffullorreduced integrationandofhybridformulationwereused.Inothermodels,quadraticinterpolationelements of full or reduced integration and of hybrid formulation were used. Comparisons are performed betweenmodelswithdifferentmodellingapproachinordertofindasuitablemodeltopredictthe mechanicalbehaviourofadhesivelybondedjoints.
On the Construction of Web-Based English Testing Platform
Authors: Li Qing Qing , Liang Xia
Published: July 2011

At present, the development and popularization of computer and network provides English teaching reform and development with new methods and means as well as a broader platform for the implementation of the autonomous, student-centered, individualized teaching model. This paper analyzes the problems in traditional English testing practice, proposes the theoretical basis for testing and training system establishment, and introduces the development process and characteristics of web-based English testing platform.
Industrial Computerized Tomography Images Segmentation Based on Cellular Neural Networks
Authors: Liu Chang Jiang , Wu Xu Lin
Published: July 2011

In this paper, we aimed at segmenting industrial computerized tomography images grounded in edge information. Most researchers focused on the edges of binary images using cellular neural network. We have expanded the scope to gray level images. Thus two groups of cellular neural network were designed to obtain closed edges. One was used to convert the gray level images to binary ones, the other to extract edges. In addition, we combined with contrastenhancement. Subsequently, tracing the obtained edges accomplished segmentation. Simulation experiments on a series of engine images demonstrate our methods can not only batch process threshold segmentation without choice threshold, but also extract the fine edges .A comparison to state-of-the-art methods show ours are easy to follow with good results.
HDR CCD Image Sensor System through Double-A/D Convertors
Authors: Yang Bin , Wang Yan Chang , Li Pei Hong , Liu Ji Lin
Published: July 2011

In this paper we present a CCD image sensor system with high dynamic range. This feature is achieved through double analog-to-digital convertors’(ADC) architecture and field programmable gate arrays(FPGA). By doing so, the system outputs high dynamic range images in real time. The proposed scheme is a low-cost solution in the sense that it can be built on top of any traditional sensor system with minor modifications on the system-level analog-to-digital module. Through the post-layout sensor system we show the experimental images to demonstrate the effectiveness.
The Development of Computer Network Intrusion Detection System Based on Data Mining
Authors: Chen Shan
Published: July 2011

In this paper, data mining algorithms have been refined and optimized to achieve the intelligent detection of network data. Winsock2 SPI used in the design of interception of network data, and use "session filtering" approach to network packet filtering. System is divided into control rules and intelligent detection module. Through practical testing, the system can display real-time network connection status on the application procedures can be effective control of network data can also be intelligent detection.
Automatic Tri-Axial Add Sample System Is Designed Based on Windows CE
Authors: Guo Jian , Wu Li , Jia Yan Li , Zhang Bing Yang
Published: July 2011

The design of automatic tri-axial add sample system is mainly used in industrial control. We design this system for solving existence in traditional control system problems. In our system we use based on S3C2440 embedded system. Through SDK which derived from the custom Windows CE Embedded System, we using integrated development environment vs2005 to develop applications program. The advantage of this application program is mainly embodied in the use of LCD touch screen to achieve human-computer interface. Through this interface can control the entire system work so that many people can be freed from the tedious labor, greatly improving work efficiency. By test this system in a practical way show that our design system has a high degree of automation, cost-effective and portable, real-time and other characteristics.
Development Of Automatic Sampling System Based On ARM
Authors: Wu Li , Zhang Bing Yang , Jia Yan Li , Guo Jian
Published: July 2011

Aim at the demand of analytical automation of sampling pretreatment, we designed an automatic sampling system which used ARM9 for microprocessor. The system designed in this paper is based on the processor of S3C2440 and the Windows CE operating system, and completed the work of programming in Visual Studio 2005. It uses stepping motors and precision pump as implementing agencies, and TA8435H as the stepping motor’s driver, uses LCD touch screen as human-computer interface. We accomplished software development in a customized Windows CE6.0 operating system. The paper mainly makes the detailed introduction to this system’s hardware platform design and software design based on WINCE embedded operation system.
Touristic Destinations’ Theme Determination for GIS Applications
Authors: Savavibool Nattapong , Pechsiri Chaveevan
Published: July 2011

This research aims to determine touristic destination’s theme (especially tourism activity theme) from the tourism web documents for geographic information system (GIS) applications, i.e. guiding the main interesting tourism activities to tourists. There are two major problems of the theme acquisition; tourism activity extraction and tourism activity generalization. Therefore, this research proposes of using Naïve Bayes Classifier to determine word co-occurrences between verbs and nouns with the tourism activity concept from web documents. Furthermore, this research also applies the fuzzy concept along with the imputation technique, to determine the tourism activity theme by generalizing the extracted tourism activity. The result of the tourism activity extraction shows successfully the precision and recall of 85% and 77%, respectively, with Mean Reciprocal Rank (MRR) of the tourism activity theme is 0.5.
Fuzzy Control of a Flexible Satellite Using Reaction Wheels
Authors: Hernandez Eliecer , Bolivar Jose , Qing Wang
Published: July 2011

A flexible satellite with solar panels dynamics is complex. The fuzzy control is implemented as a attitude control and stabilization of flexible satellite. Based on the knowledge and information of the flexible satellite, the parameters of the controller could be modified accordingly. Simulation results show that the controller can effectively cope with the uncertainty of flexible satellite. Under the proposed method, a higher damping rate of the vibration is obtained and higher precision of attitude control of satellite can be achieved.
Symmetry Breaking and Symmetry Increasing in a Vibro-Impact with Symmetric Two-Sided Constraints
Authors: Yue Yuan , Xie Jian Huab
Published: July 2011

A three-degree-of-freedom vibro-impact system with symmetric two-sided constraints is considered. Existence conditions of the symmetric period -2 motion are given, and the symmetric period n-2 motion of the system is deduced analytically. The six dimensional Poincaré map is established, and the Jacobi matrix of the symmetrixc fixed point is obtained. By the numerical simulations, we show that symmetry breaking and symmetry increasing exists in the vibro-impact system with symmetric two-sided constraints.
The Study on Cross-Industry Standard Process for Data Mining in E-Marketing
Authors: Wang Juan
Published: July 2011

According to the standard data mining process, CRISP-DM, one can directly collect data that are essential and useful for the mining results. It also offers practical help to those KD researchers both from industry and academia. In this paper, a KD procedure and method of E-marketing is discussed thoroughly, and a simple operating and easy understanding process model is presented to marketing people with little data mining background. In addition, the traditional market research methods are highly subjective; it is difficult to support the objective marketing decisions. While the KDDM process model can be effective in helping market analyst find the distribution and propensity of customers, thus to predict customer needs, determine the marketing strategy and ultimately to develop effective marketing plans.
Transforming Model from Vague Set to Fuzzy Set Based on the DWCO Operator
Authors: Wang Chao , Zhou Qi Hai , Li Yan
Published: July 2011

In the research on transforming vague set to fuzzy set, it is the key question to carry on the judgment to the vague-degree's tendentiousness. Vague set's vague-degree expresses one kind of indefinite degree, therefore the question transforming vague set to fuzzy set may regard as the venture decision under the definite condition. When the policy-maker carries on the venture decision, the policy-maker's risk preferences decided by the subjective and objective condition is a very essential policy-making parameter. In this paper, introduce the risk-income balancing weight into the transforming model, thus enable reflect the policy-maker's risk preferences well in the transforming result. In addition, decompose the value of fuzzy set's membership degree into the following two parts: the value of vague set's real membership degree, the weighting sum of the risk value and the tendency value.
Analysis of Scientific Papers about Taekwondo in Core Chinese Journals during 2000-2010
Authors: Pang Jun Peng
Published: July 2011

By using method of mathematical statics and literature, we carry out stratified statistic, generalization and analysis of the scientific papers about Taekwondo in Core Chinese Journals (CCJ) during 2000-2010 according to five dimensions, including published time, the application of research methods, research fields, professional title and organization of authors, and language of citation. The result shows that not many scientific papers about Taekwondo have published in CCJ of these 11 years; research methods have been used widely, but the specific research method is rather single; contents of research are very wide; the authors are mainly lecturers and the organizations are mainly based on independent sports colleges; the major language of citation is Chinese and foreign languages are very few, especially Korean – there is no citation in Korean.
Research on the Value of Rock-Climbing
Authors: Qiu Xian Rong
Published: July 2011

This article discussing the value of Rock-Climbing utilizes literature material method, the logical analytic method, induction and deduction methods. To raising people's understanding on Rock-Climbing, and promote more and more outdoor sports lovers involved into Rock-Climbing.
The Effect of Zn on Microstructures and Properties of Extruded Mg-Gd-Y Alloys
Authors: Li Hui Zhong , Liu Hong Ting , Wang Hai Jun , Guo Fei Fei , Liang Xiao Peng , Liu Chu Ming
Published: July 2011

By using digital micro-hardness testing, mechanical testing, optical microscopy(OM), scanning electron microscopy(SEM), transimission electron microscopy(TEM), microstructure and mechanical properties of Mg-9Gd-3Y-xZn (x=0,1,2,3 wt.%) alloys during extrusion and following aging at 210 °C were investigated. The results showed that Zn can refined grains of the alloy. In T5 condition the average grains of the alloy without Zn addition were about 20.08 μm; the average grains of the alloys with 1 wt.% Zn addition and 3 wt.% Zn addition were about 15.26 μm and 10.17 μm, respectively. For the alloy with 1 wt.% Zn addition in peak-aged state, the values of tensile strength and yield strength reached 418MPa and 329 MPa, as well as ductility rate reached 5.6 %, respectively, exhibiting superior mechanical properties .
Potential of Reducing the Environmental Impact of Aviation by Using Hydrogen
Authors: Zhang Tian Gang , Hou Xiao Yun
Published: July 2011

Large investments have already been made in Europe and the US through R&T programmes and collaborations to reduce the negative environmental effects of aircraft use. Research is therefore providing the technologies to improve the performance of existing engine components. The main objective of the paper is to evaluate the potential of reducing the environmental impact of civil subsonic aviation by using hydrogen fuel. Looking at the prospect of alternative fuels, synthetic kerosene produced from biomass turns out to be feasible and offers environmental benefits in the short run, whereas hydrogen seems to be the more attractive alternative in the long run. Powering aero engines and aircraft with hydrogen has been done successfully on a number of occasions in the past.
NOx Emission Control in Gas Turbines
Authors: Zhang Tian Gang , Hou Xiao Yun
Published: July 2011

The increase, in recent years, in the size and efficiency of gas turbines burning natural gas in combined cycle has occurred against a background of tightening environmental legislation on the emission of nitrogen oxides. The higher turbine entry temperatures required for efficiency improvement tend to increase NOX production. To reduce NOX emissions, new engine core configurations with heat management and active systems, as well as advanced combustor technology, have to be investigated. This paper reviews the various approaches adopted by the main gas turbine manufacturers which are achieving low levels of NOX emission from natural gas combustion.
Optimized Depth Control of Underwater Vehicle with Fins
Authors: Li Ye , Pang Yong Jie , Huang Shu Ling , Chen Peng Yun
Published: July 2011

Underwater vehicle plays an important role in ocean engineering. Depth control by fin is one of the difficulties for underwater vehicle in motion control. Depth control is indirect due to the freedom coupling between trim and axial motion. It is included the method of dynamic analysis and lift-resistance-coefficient experiment and theory algorithm. Considering the current speed and depth deviation, comprehensive interpretation is used in object-planning instruction. Expected depth is transformed into expected trim. Dynamic output fluctuation can be avoided, which is caused by linear mapping of deviation. It is steady and accurate for the motion of controlled underwater vehicle. The feasibility and efficiency are testified in the pool and natural area for experiments.
Simulation on Driving Performance of the Vehicle Based on Modeling Tire
Authors: Zhu Yue Ying , Zhao Gui Fan , Wang You Shan , Yin Li Liang
Published: July 2011

The finite element method was used to establish model of radial tire and analysis the characteristics of tire in driving state to improve the accuracy of simulation on driving performance of off-road vehicle. The dynamics models of the vehicle and its subsystem are designed to provide an off-line dynamic simulation for vehicle driving performance. Simulation and analysis for the vehicle selected previously are made, and the simulation results are compared and analyzed in detail to prove the effectiveness of the new method.
CFD Simulation on the Phase Change Storage Energy Materials
Authors: Qiu Lin , Yan Min , Lu Song
Published: July 2011

This paper studied a phase change process of phase change material (PCM) application building energy storage by CFD software. Set up the phase change process physics model consideration natural convection, the phenomenon of heat transfer from phase change and the impact of rules have been discussed, the proportion of solid and liquid of the process of phase change, the time of phase change, the interface of phase change and motion temperature image of liquid-region carried out numerical simulation. The results show that the natural convection generates the circumfluence at the liquid state of the phase change process, it takes on the role of accelerating the melt and reducing the solidification.
Research on Triaxial Linkage and Cut Point Tracking for Automotive Crankshaft Servo Grinder and its Key Technology
Authors: Huang Xing Hong , Pan Xu Hua , Wu Xing , Huang Wen Guang
Published: July 2011

Based on the principle analysis of two-axis linkage and cut point tracking crankshaft servo grinding technology, the principle of triaxial linkage and cut point tracking for crankshaft servo grinding is analyzed and researched on the technological advantages for the neck of crankshaft connecting rod and the spindle neck. Then the dynamic grinding model is established, and the high-precision liquid hydrostatic slide-way technology, high rigidity straight line drive technology and on-line measurement and error compensation technology are employed synthetically to solve the dynamic performance of moving parts for ultra-precision grinding and its influence on the machining accuracy successfully. The problem of using common corundum wheel to process the crankshaft neck and connecting rod efficiently and accurately is conquered.
Diagnoses of Abnormal Noise in the Pickup Based on LMS Test.Lab
Authors: Kong Dan Dan , Fang Huab , Wang Tian Ling
Published: July 2011

In this paper, in order to solve the abnormal noise in the pickup while it accelerated or decelerated, the test was done through the use of LMS Test.Lab system, the spectrum and correlation analyses of vibration and noise were carried out, then it was known that the noise source was turbocharger. The farther research direction and improvement measures were given.
Finite Element Analysis on Magnetic Flux Leakage of Interior Permanent Magnet Generator for Vehicle
Authors: Zhang Xue Yi , Yin Hong Bin , Shi Li Wei
Published: July 2011

In order to solve the problem that no-load magnetic flux leakage coefficient is not accurate when it is calculated by the method of magnetic circuit, a model of interior permanent magnet(IPM) generator with 36 slots for vehicle was built through the finite element method of the ANSYS, and then a means of calculating the IPM generator’s magnetic flux was put forward after analyzing the magnetic flux leakage conditions of different rotor structures under the circumstance of not changing stator structure. The ralationships among the pairs of poles, the magnet width, the thickness of non-magnetic sleeve, the length of air-gap and the magnetic flux leakage coefficient were obtained, and they provided forceful guidance for the structural design of IPM generator.
A Study on Group Counseling Effect Estimated by Sociometry and Attributional Style Questionnaire
Authors: Wang Tang Sheng , Yin Jing Hai , Hu Jian Feng
Published: July 2011

This article focused on the effect of group counseling in classes building and students’ positive explanation style in Chinese colleges. The authors adopted group counseling activity into Psychological teaching and estimated its effect with Sociometry and Attributional Style Questionnaire. The result showed that group counseling was better at classes building than traditional Psychological healthy teaching, and especially take advantage of the later approach at positive explanation style obtain. As a result, the program proved the group counseling’s advantage, defined validity of group counseling activity and finally found some effective Group counseling activity schemes which would bring benefit to mental health teaching.
An Algorithm of Constraint Frequent Neighboring Class Set Mining Based on Downward Search
Authors: Tu Cheng Sheng
Published: July 2011

As present constraint frequent neighboring class set mining algorithms have some redundancy candidate constraint frequent neighboring class set and some repeated computing. And so this paper proposes an algorithm of constraint frequent neighboring class set mining based on downward search, which is suitable for mining long constraint frequent neighboring class set from large spatial database via downward search. The algorithm adopts binary arrangement to turn spatial instance into integer, which is regarded as a spatial transaction, and it uses candidate domain mapping to create constraint frequent neighboring class set via downward search, namely, the algorithm creates candidate domain and uses an integer in the domain to map a candidate, downward search is that this integer of mapping candidate is from maximum to minimum. The method is different from traditional down search or top-down search. The experimental result indicates that the algorithm is more efficient than present constraint frequent neighboring class set mining algorithm when mining long constraint frequent neighboring class set.
Accumulation and Tolerance of Zinc in Ornamental Plant Chlorophytum comosum
Authors: Tao Jie Min , Wang You Bao , Dai Jie
Published: July 2011

Chlorophytum comosum seedlings were treated with different Zinc (Zn) concentrations (CK, 200, 400, 600, 800, 1000, 1500, 2000 mg·kg-1dried growth medium) under controlled conditions. Physiological parameters and Zn content of roots and shoots were examined by pot-planting over a period of three months. The results showed that the length of roots, the fresh and the dried weight of plants were inhibited by Zn of all concentrations, while the length of aboveground parts and the volume of roots were stimulated by the lower Zn level. The Tolerance Index (TI) of C. comosum were above 50 in soil of Zn concentration less than 600mg·kg-1. In addition, results indicate thatC. comosumcan accumulate Pb up to 1093 mg·kg-1and 4700 mg·kg-1dry weight in roots and leaves respectively in Zn concentration of soil up to 2000 mg·kg-1.
A Simulation Study on the End Milling Operation with Multiple Process Steps of Aeronautical Frame Monolithic Components
Authors: Ye Hai Chao , Qin Guo Hua , Wang Cong Kang , Lu Dong
Published: July 2011

Machining deformation has always been a bottleneck issue in the manufacturing field of aeronautical monolithic components. On the base of finite element method, the effect of the process steps and tool paths on the workpiece stiffness and the redistribution of residual stress in the machining process of aeronautical frame monolithic component was investigated under the given fixturing scheme. Thus, the prediction of the workpiece deformation can be carried out in reason. The proposed simulation approach to deformation analysis can be used to observe the true characteristic of milling forces and machining deformations. Therefore, the proposed method can supply the theoretical basis for the determination of the optimal process parameters.
Optimum Layout of Partially Covered Sandwich Beam with Constrained Layer Damping
Authors: Hou Shou Wu , Jiao Ying Hou , Chen Zhao Bo
Published: July 2011

In this paper, an optimization study of partially covered beam with a constrained viscoelastic layer is presented. An energy approach and Lagrange’s method are used to establish the governing equation of motion of a CLD covered beam, and the assumed modes method is employed in solving the equation to obtain the modal loss factors which are used as the objective of optimal layout. A genetic algorithm of big mutation is employed to search for the optimum of the patch’s location, the thicknesses of both the constraining layer (CL) and the viscoelastic layer (VL) and the shear modulus of the viscoelastic material with the restriction of added volume of the total CLD treatment. Numerical results show that the optima of the design variables are highly relevant to each other. The thinner constraining layer requires a softer viscoelastic material for an optimal damping treatment. The variation of the CL thickness decreases slowly and that of the VL thickness increases with the increase of the thickness of the CLD treatment. One end of optimal damping treatment locates closely one end of base beam.
Characteristics of Non-Methane Hydrocarbons in the Atmosphere of Guangzhou
Authors: Li Long Feng , Wang Xin Ming
Published: July 2011

From March to December 2005 NMHCs were measured in an urban site in Guangzhou. Air samples were collected with canister and analyzed for HMHCs by GC-MSD/FID after cryogenic pre-concentration. Mixing ratios of Alkanes accounted for over 43% in total NMHCs in each month while the shares of aromatic hydrocarbons were 19-28%. In average ethyne was the most abundant compound (5.46 ppbv), followed by propane (4.49 ppbv) and toluene (4.19 ppbv). Seasonal variations of most anthropogenic hydrocarbons revealed higher mixing ratios in autumn-winter than in spring-summer. Isoprene, on the contrary, exhibited the the highest levels in summer and the lowest in spring. Anthropogenic NMHCs typically showed a first peak around 8:00 local time in morning and 20:00 local time in the evening, while isoprene revealed a different bimodal diurnal pattern.
Discussion on the Mechanism of Corrosion Resistance of High Temperature QPQ Treated Specimens in H2S Environment
Authors: Li Yuan Hui , Zhang Shi Ping , Ding Yi Chao , Jiang Zi Lian
Published: July 2011

By constant stress tensile test, the corrosion mechanism of high temperature QPQ treated 25CrMnMo steel specimen in H2S environment was analyzed and discussed. The γ′-Fe4N in the ε compound layer turns into corrosion substance in the test and expands. At the surface of the ε compound layer, the corrosion layer is visible. The compound layer breaks off in little blocks for volume expansion of the corrosion substance and the exterior tensile stress. The coefficient of diffusion of hydrogen atom in the ε compound layer is very low, that decrease the probability of the hydrogen-induced corrosion of high temperature QPQ treated specimens in H2S environment.
Effects of the Self-Healing Microcapsules on the Impact Property of Polymer Composite Gear
Authors: Zhang Li , Gong Yan Jue , Zhang Shuo
Published: July 2011

By designing the different formulations of the composites and adopting optimized technology including extrusion and molding, the effects of the Micro-capsules on the properties of nylon composites are analyzed by the impact property test. The mechanical impact property of the glass fiber reinforced nylon composites is influenced little if the content of the self-healing microcapsules added is less than 3.5%, and the technology of self-healing microcapsules used in the polymer composite gear is feasible.
The Impact Assessment of the Managed Motorway on M25 Junction 5 to 7
Authors: Chao Sui , Wu Ling Tao , Chen Jian Yun
Published: July 2011

This study introduces the transport situation and polices of the highway agency for the M25. Then the current implementation of the Managed Motorway on M25 between junction 5 and junction 7 is reviewed, and some examples are given in this paper. Then a technical state-of-the-art of application is also reviewed. After that, the requirements for integration with complementary systems and polices are presented. Finally, this paper discusses the arguments for and against taking this application forward.
The Comparison of Amino Acid Content of the Hydrolysate under Extrusion Pretreatment with Non-Extrusion Pretreatment
Authors: Sui Xiao Nan , Jiang Lian Zhou , Wang Chen , Li Yang
Published: July 2011

The extrusion pretreatment was employed in the aqueous enzyme assisted extraction (EAEP) of oil process. The amount of amino acid was detected during the study. Experimental results indicated that the extrusion pretreatment contributed to the increment of free amino acid amount.
Divided Flow Extrusion of AZ31 Magnesium Alloy with Cerium and Antimony Addition
Authors: Zhang Bao Feng , Li Shuang Xi , Li Qing Kui , Jiang Ai Yun
Published: July 2011

Divided flow extrusion deformation behaviors and as-extruded tube properties of AZ31-Ce-Sb alloy were investigated. Addition of Sb and RE in AZ31 could accelerate the nucleation of dynamic recrystallization grains and refine tube microstructure. Compared to AZ31 Mg alloy, higher deformation temperature, extrusion speed and ration were allowed. AZ31-1%Ce-1%Sb alloy tubes had much better comprehensive performance.
Research on Multitask Collaborative Scheduling Problem with Heuristic Strategies
Authors: Zhang Fan , Teng Gui Fa , Ma Jian Bin , Yao Jie
Published: July 2011

According to problems existed in the current farm machinery scheduling process, a new farm machinery scheduling scheme is adopted in this dissertation. The collaborative scheduling model of farm machinery is established and multitask collaborative scheduling algorithm is designed through analyzing the differences between Vehicle Scheduling Problem and agricultural machinery scheduling in the dissertation. Earliest Start Time First and minimal resource allocated capacity first strategies are used in the farm machinery scheduling. The algorithm is useful for the case of machinery owner with sufficient farm machinery. The experiment proves that the collaborative scheduling algorithm is more effective than the serial scheduling algorithm.
Finite Element Analysis and Deep Drawing of Cylindrical Cups with 5A90 Al-Li Alloy Sheets
Authors: Ma Gao Shan , Wang Han Ying , Zhang Song Yang , Wan Min
Published: July 2011

The cylindrical cup drawing of 5A90 Aluminum-Lithium alloy sheets at various forming conditions was studied by both the experimental approach and the finite element analysis. The uniaxial tensile tests and forming limit tests of 5A90 Al-Li alloy sheets at various temperatures were first carried out. The tests results were then employed in the finite element simulations to investigate the effects of process parameters, such as forming temperature, holder force, and die corner radius, on the formability of cylindrical cup drawing with 5A90 sheets. In order to validate the finite element analysis, the corresponding deep drawing tests were also carried out. It is shown that the simulation results are in qualitative agreement with the experimental observations. The optimal forming temperature, diameter of blank, holder force, punch radius and die corner radius were then determined for the cylindrical cup drawing of 5A90 sheets, and the limit drawing ratio (LDR) reached 2.4 in the optimal parameter conditions.
Axisymmetric Compression Wave Propagation in a Magneto-Electro-Elastic Cylinder
Authors: Jing Jin
Published: July 2011

In this paper the propagation properties of axisymmetric compression wave in an infinite and transversely isotropic magneto-electro-elastic cylinder are investigated. Numerical results show that mechanical boundary conditions have obvious and different influences on the propagation properties of axisymmetric compression wave in a magneto-electro-elastic cylinder.
YAG Laser Welding of Shape Memory Alloy
Authors: Zhou Hai Shen , Li Hong Guang , Wang Wei
Published: July 2011

With high energy YAG Laser beam method, the weld ability of the TiNi shape memory alloy sheet was studied.The mechanical properties of both reference and laser welded samples were tested by stress–strain measurements. A systematic comparison of the results was carried out. Moreover, differential scanning calorimeter (DSC) investigations on samples taken from the heat affected zone and hardness measurements allowed further clarification that the modification was induced by the welding procedure. The crystal grain in welded joint is large , and new phases such as Ni3Ti separate out.The results obtained on laser welded samples indicate the recovery mechanisms are little weakly modified by the presence of the welding zone.
Research on how Metal Cover Rate and Expand Level of Vascular Stent Influences the Expand Process
Authors: Dong He Yan , Liu Zhen Feng , Ma Zong Min , Cheng Zeng Bing
Published: July 2011

At present, vascular stent which is a very important method to cure vascular stenosis is a hot point of study. Metal cover rate and expand level are two important elements of stent designing. In this paper, we use the method of finite element analysis to study how metal cover rate and expand level influences the properties of stent. The result shows that in the expand process, the stent that have a lower metal cover rate and expand level will expand easier, and this conclusion can be used to evaluate the designed stent. At the same time it shows that the finite element analysis is a useful method to design and evaluate the stent.
Study on Fatigue Crack Growth Model of 7075-T7410 Aluminum Alloy Straight Attachment Lug
Authors: Wu Li Ming , He Yu Ting , Wang Xin Bo , Zhang Hai Wei , Du Jin Qiang , Ding Hua
Published: July 2011

The finite element model of a 7075-T7410 straight attachment lug is built by using the finite element software ANSYS, a cosine distribution pin-bearing pressure is applied on the surface of the pin-hole as a boundary condition. The stress intensity factor (SIF) expression for the straight attachment lug with a single through-the-thickness crack and subjected to an axial pin-load is determined by studying on the effect of the geometric parameters (the dimensionless crack length a/R1，the ratio of outer radius to inside radius R2/R1 and the inside radius R1) on SIF value. The fatigue crack growth velocity (da-dN) and the stress intensity factor’s amplitude (ΔK) is calculated by the SIFs equations to get the values of the Paris constants, offering an analytical method for establishment of the fatigue crack growth model of the typical straight lugs. The paper can be helpful in assessing and designing damage tolerant attachment lugs.
Deformation Measurement of an Inflatable Reflector Using Digital Image Correlation
Authors: Lin Guo Chang , Tan Hui Feng , Bai Xiang Hong
Published: July 2011

Inflatable antenna is a potential technique for large space deployable antenna and knowing its reflector’s deformation behavior is quite important for its accuracy improvement. A 1.5m-diameter inflatable reflector’s deformations at different internal pressures are studied using digital image correlation(DIC) in the paper. Because of the symmetry of the reflector, only two representative gores on the reflector are chosen to study. During the digital image correlation measurement, some article random dot patterns are drawn on the reflector’s surface. The 2D and 3D displacement maps of the reflector at different internal pressures are gained by DIC measurement and the cross-section of one gore of the reflector according to the internal pressure are analyzed from the measurement results.
An Improved Way of Detecting the Threshold Value of Chaotic Motion on a Parametrical Excited Rectangular Thin Plate
Authors: Ge Gen , Zhu Zhi Wen
Published: July 2011

One dynamical model of a thin rectangular plate subject to in-plate parametrical excitation is proposed based on elastic theory and Galerkin’s approach. At first, the undermined fundamental frequency and normal form method was utilized to study the influence of the disturbing parameters to the fundamental frequency. Secondly, the improved Melnikov expression for the oscillator was built based on the results of the undermined fundamental frequency method and time scale transformation to improve the approximate threshold value of chaotic motion in the Homoclinicity. Finally, the numerical results show the efficiency of the theoretical analysis.
Research of the Determination of Thin Film Optical Constants by Using the Simulated Annealing Algorithm
Authors: Wang Wen Liang , Rong Xiao Hong
Published: July 2011

Simulated annealing algorithm is a mathematic model, which imitates the physical process of annealing. And optical thin film is widely used in many industry, To perform the functions for which they were designed, the films must have proper thickness, roughness and other characteristics. In the paper, the simulated annealing algorithm is used to determine the film optical constant It uses the transmission data through thin film over a range of wavelengths to calculate the thickness. According to the experimental results, the solution found by simulated annealing algorithm is unique and correct.
The Investigation of the Influence of Structure Parameters on the Friction-Induced Self-Excited Vibration
Authors: Meng Xian Jie
Published: July 2011

A one degree of freedom nonlinear dynamics model of self-excited vibration induced by dry-friction was built firstly, the numerical method was taken to study the impacts of structure parameters on self-excited vibration. The calculation result shows that the variation of stiffness can change the vibration amplitude and frequency of the self-excited vibration, but can not eliminate it, Along with the increase of system damping the self-excite vibration has the weakened trend and there a ritical damping, when damping is greater than it the self-excite vibration will be disappeared.
Study on the Serial Design of Chain Wheel of the Roller Chain Based on Pro/E
Authors: Le Li Jia , Yong Liu
Published: July 2011

The roller chain is a kind of flexible transmission with high transmission efficiency, low precision requirement for the manufacture and mount of the base machine. Therefore, the roller chain is widely used in machinery manufacturing. In this paper, we use the man-machine interactive input to set a different parameters to create a different number of chain wheels with different standard pitch diameter and tip diameter by the Pro/Programme and we use the Family table that allows for rapid modeling of chain wheel to improve the design efficiency and quality of parts.
A Game Theoretic Approach to Job Shop Scheduling
Authors: Jiang Wen Rui , Lu Cong , Li Fang Zhen
Published: July 2011

This paper proposes a non-cooperative game approach based on neural network (GMBNN) to solve the job shop scheduling problem. Machines in manufacturing task are defined as players and strategies consist of all the feasible programs which are selected by dispatching rules for minimizing the mean flowtime. Strategies for the game model are generated from a backpropagation neural network, which selects combination of the rules for the machines. Case study shows that the GMBNN can be an effective approach to solve the job shop scheduling problem.
A Study on Supply Chain Management of Software-Focused Products
Authors: Cao Cheng Xuan , Ren Chong Ling , Shi Wen Wen , Li Jing
Published: July 2011

In this paper, we introduce the concept of the software-focused chain. A software focused product consists of hardware component and software component, where the software component is either the higher value part of the product. We study a software-focused product and service supply chain based on the case study of Beijing UniStrong Company. We discuss the common and unique issues that a software-focused supply chain has compared with a traditional supply chain. Issues and challenges of the software-focused supply chain management have also been studied in the paper.
Integrate Uncertainty in the Process of Prognostics for Electronics
Authors: Wang Yi , Xiao Ming Qing , Fang Jia Yong
Published: July 2011

Elements of uncertainty in the electronics Prognostics process were studied. A method for electronics Dynamic Damage Optimal Estimation and prognostics based on Particle Filtering were proposed. Under the effect of time stress, the electronics cumulative damage is the result of the continuous effect of the stress, as a result, a HMM based electronics dynamic damage model was built at first place, analytical results of uncertainties in the process of prognostics were given and thus a Bayesian based filter system was built. Bayesian Filter change the problem of uncertainty into an optimal estimation processes as a result, the optimal estimation was fetched by applying the particle filtering into the estimation. The experiment case study proved that the proposed method can eliminate the uncertainties caused by measurement and the system effectively and improve the RUL prediction accuracy.
Simulation and Optimization of U-Bending Springback Using Genetic Algorithms
Authors: Chen Lei
Published: July 2011

Springback during unloading affects the dimensional accuracy of sheet metal parts. This paper proposes a finite element model to predict springback with contact evolution between the sheet and dies. The underlying formulation is based on updated Lagrangian elastoplastic materials model. The solutions validated with experimental data of NUMISHEET’93 show more accurately. The effects of the variable blank holding force (VBHF) on springback results are investigated based on genetic algorithms (GAs) for the determination of the parameters in blank holding operations. It has been found that the GAs based optimization technique is very effective in solving this kind of problem. The difficulty of choosing correct starting values for the constants in the traditional optimization techniques has been completely overcome and the GAs technique provides a better chance to converge to the global minimum.
Study on Control of Hydraulic Disc Brake System Based on PWM High Speed On/Off Valve
Authors: Wang Yu , Lin Li
Published: July 2011

With the development of oil exploration and electronics technology, the automation control technologies of hydraulic disc brake system (HDBS) have become more and more widely used. After analysis the braking performance of HDBS, The optimizing schemes for hydraulic disc brake, such as PWM high speed on/off valve and pressure switch are used in the constant weight auto-drilling system. It has been tested successfully both on the integrated braking facility in lab and in the oil field. And it proved that the PWM valve have great prospects on the braking system.
Design of Automatic Clutch System and Simulation of Engagement Process for AMT
Authors: Qu Jin Yu , Zhang Yi Rui , Qu Gui Xian , Liu Lin
Published: July 2011

In this paper the executive mechanism and electric-hydraulic control system for AMT automatic clutch were designed. A hydraulic cylinder was applied as the actuator. The hydraulic source with constant pressure using electric oil pump was designed. The basic idea lies in using pulse signal with variable duty cycle to drive high-speed solenoid valves in the process of regulating hydraulic circuits. Hydraulic oil drives the cylinder to realize the control of dry clutch. At last, the actuator was modeled and simulated based on AMESIM. From the analysis of the simulation results, the system mentioned in this paper can meet the performance requirements of AMT equipped with automatic clutch.
Hybrid KPCA-SVM Method for Pattern Recognition of Chatter Gestation
Authors: Shao Qiang , Feng Chang Jian , Li Wen Long
Published: July 2011

To distinguish chatter gestation, chatter recognition method based on hybrid KPCA(Kernel Principal Compenent Analysis) and SVM(Support Vector Machine) is proposed for dynamic patterns of chatter gestation in cutting process. At first, FFT features are extracted from the vibration signal of cutting process, then FFT vectors are presorted and introduced to KPCA-SVM for machine learning and classification. Finally the results of chatter gestation recognition and chatter prediction experiments are presented and show that the method proposed is effective.
Characterization on Duplex Treated Coating Fabricated by Laser Cladding and Active Screen Plasma Nitriding
Authors: Zhang Xiao Dong , Xu Bin Shi , Dong Shi Yun , Wang Zhi Jian , Dong Han Shan , Li Qing Fen
Published: July 2011

In order to enhance the performances of laser remanufacturing part, we combined laser cladding with active screen plasma nitriding duplex treatment to repair metal part. The microstructure, phase structure and micro-hardness of duplex treated coating were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and micro-hardness tester. Wear tests were carried out on reciprocating wear tester under dry sliding condition. The results show that the white layer and the nitrogen diffusion layer were formed after nitriding treatment. The duplex treated coating consists mainly of γ-Fe, CrN, Fe4N and Fe3N. The duplex treated coating improved not only surface hardness but also wear resistance.
A New Rigid Plastic Messless Method for Simulation of Bulk Metal Forming Processes
Authors: Foroutan M. , Mortazavi M.
Published: July 2011

In this paper a rigid plastic mesh free method for slightly compressible materials is presented for the simulation of bulk metal forming processes. In this model MLS shape functions are used for the approximation of velocity field. These shape functions are defined in initial coordinates of particles. By using this method the support of shape functions covers the same set of particles during material deformation. Transformation method is used for imposition of essential boundary conditions. Transformation matrix is formed only once at the initial stage, because shape functions are defined in initial coordinates system. For evaluation of the presented model, disk upsetting and ring upsetting processes are simulated. Results obtained from this model are compared with experimental data and FEM results and good agreement is observed between them.
Effect of Process Parameters on Abrasive Contamination during Water Abrasive Jet Machining of Mild Steel
Authors: Mohd Ali Afifah , Khan Ahsan Ali , Ali Mohammad Yeakub
Published: July 2011

In the area of grit blasting, it is well known that microscopically small abrasive debris gets trapped on the surface, and due to impact the grits might cause the surface to fracture and a fraction of it to be embedded. The same problem appears in abrasive water jet (AWJ) machining especially in the so-called deformation wear zone or striation zone. The major aim in this study is to investigate the abrasive contamination on mild steel cutting surface. In the present study mild steel was used as the work material, since it is widely used in many industries. In order to analyze the pattern of the contaminations on the cut surface, the selected process parameters were abrasive flow rate, pressure and work feed rate. Abrasive contamination was measured at different depths along the path of the abrasives. The three selected zones for measuring abrasive contamination at different depths were the primary impact zone, the smoother zone and the deformation wear zone. It was found that contamination at the middle zone, i.e., the smoother zone had the least abrasive contamination while the initial impact zone and the deformation wear zone showed high abrasive contamination. It was also found that a higher pressure reduces abrasive contamination while a higher abrasive flow rate and work feed rate increase abrasive contamination.