bluuebunny/crossref_metadata_2025 huggingface dataset:
Research and Practice for Experimental Teaching of the Innovative Design of the Machine Driving Plan
Authors: Zhao Hong Zhi , Tan Qing Chang , Sun Shu Ting , Li Wei , Kou Zhun Quan
Published: September 2010

The experimental table of the innovative design of the machine driving plan is introduced. The experimental table mainly consists of CAD system and machine structure assembly platform. Based on the experimental table, CAD, dimensional design and motion analysis of the machine driving plan can be carried out. The basic mechanisms and parts provided by the experimental table are used to assemble the machine driving plan and inspect the design plan. The experimental table has the novel structure, complete types of basic mechanisms and parts, big scale of adjustment of the motion dimensions of the members and simple assembly and jointing. The teaching exploration of the learning model of the innovative design of machine driving based on the experiment is made. Practice proves that the new learning model plays the role of promoting the students’ innovative thinking, cultivation of the students’ practice capability and improving the cultivation quality of talents.
Design of a 5-DOF Rehabilitation Robot Mechanism for Upper Limb and its Kinematics Analysis
Authors: Lan Zhi , Li Zhen Liang , Li Ya
Published: September 2010

A novel 5-DOF upper limb rehabilitation robot, which can implement single joint and multi-joint complex motions and provide activities of daily living (ADL) training for hemiplegic patients, was presented. The solutions of the robot’s kinematics equation were set up by the method of D-H according to the 5-DOF rehabilitation robot for upper limb. Based on the software of ADAMS, the mechanism was simulated and analyzed. Thus the movement of robot is determinate in a certain condition of importation. It offered important data for the trajectory planning and the actual intellective control of rehabilitating robot.
A Sweet Spot Model for Batting
Authors: Li Fei , Zhang Yuan Biao , Hu Shan Shan , Liang Hai Rui
Published: September 2010

. In this paper, we provide a Sweet Spot Model for two problems: where the “Sweet Spot” is and how the bat affects the hitting-effect. Our model is very close to live. And we can find the exact position of Sweet Spot and see the relationship between the rebound velocity of the ball after hitting and the factors of hitting point, such as the speed of bat before hitting, the speed of the ball before hitting, Coefficient of Restitution (COR) (a constant determined by the bat material), the mass distribution of bat and so on. After that, we apply our model to corked bats and study the influence of “corking”.
Numerical Simulation Calculation of Ship Submarine Oil Spill under Complicated Ocean Environment
Authors: Liang Xiao , Zhang Jun Dong , Li Wei , Lin Jian Guo
Published: September 2010

In order to conduct the cleaning of spilled oil, to protect the marine ecological balance and to prevent the damage to marine environment by oil spill, the simulation of oil spill in deep water with the wave motion, wind and current was built by the user defined function and the volume of fluid in FLUENT. The dispersion and diffusion of oil spill in deep water was simulated dynamically. Also the oil spilling trajectories under the conditions of different current velocities, wavelengths and wind velocities were compared and analyzed, respectively. The results showed that the current, wind and wave decided the location and areas of oil films on the sea surface. The water depth influenced by the wave which increased with the increasing wavelength. Meantime, the areas of oil films on sea surface increased with current velocity decreasing, while the distance between the oil film and the source of oil increased. With the wind velocity increasing, the extended length of oil dispersion underwater and the oil film area on surface increased.
The Research on Software of the Temperature Control of Motor Speed System
Authors: Tang Jing , Zheng En Xing
Published: September 2010

The paper designs a temperature control system based on AT89C51 and DS18B20. The design uses the DS18B20 digital temperature sensor as the temperature acquisition unit and the AT89C51 microcontroller unit to control them, not only have the advantages that easy to control and with good flexibility, but also can greatly enhance the controlled temperature index.
On Computing Leakage Flow of Plunger Pair in Radial-Plunger Pump
Authors: Sun Yin Da , Xu Wen Qin
Published: September 2010

A new radial plunger pump is given which is installed with roller between plunger and stator, the roller is purely rolling on the inner face of stator, reducing the friction force and effectively avoiding the combustion of friction pair in working orde. When viscosity varies with pressure and temperature, hydraulic pressure and cutting flow caused by plunger moving in the plunger auxiliary of a new radial-plunger pump, the computing formula of annular gap is corrected here, which provide a theoretical support for developing a high efficient radial-plunger pump.
Mechanics Model and Machining Distortion Analysis for High Speed Milling of Titanium Alloy Aircraft Monolithic Component
Authors: Yang Yong , Li Chang He , Yang Fa Zhan
Published: September 2010

A physics-based material processing simulation is approached to research the machining distortion for high speed milling of titanium alloy aircraft monolithic component by the finite element method (FEM). Several mechanics models, such as material constitutive model, material removal model, and cutting loads application model, have been implemented to improve the accuracy of finite element simulation. The distortion result of aircraft monolithic component resulting from FEM show a good agreement with the experiment result. The research result shows that the distortion law of titanium alloy aircraft monolithic component is bending distortion and protruding upward, and the maximum distortion dimension lies in the middle of monolithic component.
Study on “Single Factor” Material Model Used in Finite Element Simulation of High Speed Cutting of Mo-Cr Cast Iron
Authors: Yang Yong , Chen Cheng Jun , Li Chang He
Published: September 2010

Theoretical analysis and material experiment are employed to study the “single factor” material model. Based on the dislocation theory, an analysis shows that material model is deeply affected by temperature. By the least squares best fit to experimental data, material parameters are found. Experiment curves analysis and material parameters comparison show that the material parameters of “single factor” model of Mo-Cr cast iron are temperature dependent. Using the mathematical mapping between material parameters and temperature, the “single factor” material model of Mo-Cr cast iron is established, which is proven to be right by comparing with experimental measurements. This work provides a useful insight for understanding the material model and helps to develop further finite element simulation of high speed cutting process of Mo-Cr cast iron.
Comparative Study of Natural Frequencies of Super-Long Steel and CFRP Cables
Authors: Xu Fu You , Chen X. , Zhang Zhe , Huang Cai Liang
Published: September 2010

By using FEM method, the natural frequencies of the super-long steel and CFRP cables with possible engineering parameters have been comprehensively studied. The error and limitations of cables’ natural frequencies theoretical calculation formula have also been analyzed. The results show that: Theoretical formula results are more approximate to out-plane frequencies of the cables. In a symmetric mode, out-plane frequency is lower than in-plane frequency, whereas in an asymmetric mode the situation is reversed. The difference between out and in-plane frequencies appear most in the first-order mode. The difference between out and in-plane frequencies is more obvious for cables with low stress, small inclined angle, long length with big sag and strong nonlinearities. The nonlinearities of CFRP cable is relatively slight for its lightweight and high strength. Out and in-plane frequencies are almost identical, and the theoretical formula is applicable to CFRP cables.
Preparation and Mechanical Properties of PTFE/SPT Composites Reinforced with Nanoparticles
Authors: Jia Zhi Ning , Yang Yu Lin , Fan Bing Li , Yu Xiao Jing
Published: September 2010

Nanoparticles have been used with polymer to make composites having remarkable properties. An attempt was made in this direction, in order to enhance the mechanical and tribological properties of nanocomposites. In the paper, the polytetrafluroethylene (PTFE) polymer-based nanocomposites filled with serpentine (SPT) and reinforced with different nanoparticles such as nano-β-carborundum whisker (β-SiCw), nano-copper and nano-TiO2 were prepared by using cold briquetting and hot-press sintering technologies. Also, the mechanical performances of these nanocomposites were studied. The quasi-static tensile experiments and dynamic mechanical thermal analysis (DTMA) were carried out. The results obtained showed that the mechanical properties of these nanocomposites stronger depend on the variety of nanoparticle. Stress-displacement and stress relaxation curves indicate that theses composites are typical viscoelastic materials. These research findings are believed to be helpful for providing practical guide in applications.
The Identification of the Natural Frequency of Rolling Bearing Rotor System Based on Combined Genetic Neural Network
Authors: Ma Tian Ran , Shan Xian Lei , Liang Hao Nan , Xiang Zhong Chen , Liu Rui Xue , Zhang Tian
Published: September 2010

During identifying the natural frequency of the rolling bearing rotor system, due to the complex non-linear relationship between the factors which influence the natural frequency, it is hard to establish a complete and accurate theoretical model. Based on the self-learning ability and approximation of non-linear mapping capability of the artificial neural network (ANN) and the powerful ability of global optimization of the genetic algorithm (GA), the paper establishes combined genetic neural network (GA–ANN) through optimizing the ANN by GA. This method establishes the mapping between a rolling bearing rotor system natural frequency and the various parameters, which reduces the calculation of the workload greatly for the study of the similar rotor structure’s natural frequency. Through using the network model to predict the natural frequency of rolling bearing rotor system under different parameters, we finally find that the predicted values are in good agreement with the experimental data, which indicates that the method is powerful in identification.
Fatigue Life Prediction Using Average Strain Range of Fatigue Process Zone
Authors: Lei Dong , Shi Bin Kai , Li Ge , Zhao Jian Hua
Published: September 2010

In low-cycle fatigue process, plastic strain takes place at notch root vicinity fast appears induced by high stress concentration. Plastic strain makes material non-uniform and the change of distribution of local stress. The approximation to stress concentration point of Neuber’s rule is not suitable for some plastic materials in engineering practice. In this paper, the average strain of fatigue process zone was considered to substitute Neuber strain for predicting fatigue life. Prediction results indicated that average strain range of fatigue process zone is more suitable than Neuber strain range for predicting low-cycle fatigue life of LY12CZ.
Monitoring Models for Plastic Debris
Authors: Wang Ting Ting , Zhang Yuan Biao , Liang Zhi Ning , Huang Wei
Published: September 2010

To strengthen monitoring for plastic debris in the ocean, our paper compared debris distributions of 2 special Garbage Patches (The North Pacific Central Gyre and Kuroshio Current area). And then we developed a computer-based optimal searching model to monitor formation and changes of debris in the oceans. We found that winds belts, currents, and regional human activities along with seasonal climatic variations can influence marine litter patterns and trends in deposition.
Deformation Measurement of Concrete by White Light Digital Image Analysis in Frequency Domain
Authors: Yang Xin Wei , Man Hong Gao , Tian Rui Lan
Published: September 2010

White light digital image analysis in frequency domain is introduced to study concrete deformation. This method has the characteristics of whole-field, non-contact measurement and the simple measuring system and can obtain displacements by frequency domination correlation arithmetic. Displacements of concrete specimen under axial tension are obtained by white light digital image analysis in frequency domain and then strains and Poisson ratio are calculated. Comparing the experimental results and the theoretical values, the error was little and the effectiveness of this method is certified. The applications of different surface features of concrete are studied.
Numerical Simulation for the Effect of Wall Material on Near Wall Conductivity in Hall Thrusters
Authors: Wu Zhi Wen , Shu Shu , Yu Da Ren , Liu Xiang Yang , Wang Ning Fei
Published: September 2010

The wall material plays an important role for the electron current due to near wall conductivity in Hall Thrusters. A Monte Carlo method combined with a one dimensional steady sheath model is presented and is applied to simulate the electron conductive current due to near wall conductivity for the different channel wall materials of Hall thruster. The simulation results show that the higher the secondary electron emission (SEE) coefficient of the channel wall material is, the greater the electron conductive current is. Based on the simulation, a physical explanation is given from the viewpoint of near wall conductivity. For the channel wall material with low SEE coefficient, the secondary electrons taking part in the near wall conductivity becomes less. In addition, the absolute potential drop in the sheath near the wall increases, which means that the sheath can stop more electrons from colliding with the channel wall. And consequently the electron conductive current due to near wall conductivity is much less. The situation is vice verse for the channel wall material with high SEE coefficient. The simulation results are qualitatively in accordance with the experiments. The results can help to choose and design the wall material of the Hall Thrusters with a high performance.
Two Dimension Value Simulation of Plasma Powder Deposition Process in Electromagnetic Field
Authors: Wang Chao , Zhang Hai Ou , Wang Gui Lan
Published: September 2010

A two dimension value simulation was carried out for studying the electromagnetic force effect on melting pool in plasma powder deposition process. As the process is a layer-laminated deposition process, the gravity and the fluid motion of molten metal in melting pool during the layer-laminated deposition process without supporting, it will difficult to form complex shape parts. So a new scheme which using the magnetic field to restrict the melting metal flow was proposed. The method designed a restricted equipment of magnetic field in order to prevent and reduce the fluid flow and collapse of the melting pool. Compared with traditional method, as the height of the deposition shape increased, the process restricted with electromagnetic force can make the shape of parts more complex and more accurate. The changes of the electromagnetic force field were simulated with the finite element analysis, while the effects of electromagnetic force on forming process were discussed. Simulation show that the method is feasible and practicable. The electromagnetic force will decrease the post-treatment procedure and could contribute to the process of plasma powder deposition manufacture.
Identification of Boiling Two-Phase Flow Regimes Based on Two Kinds of Neural Networks
Authors: Guo Lei , Zhang Shu Sheng , Chen Ya Qun , Cheng Lin
Published: September 2010

In this paper, the boiling phenomena of steam boiler under atmospheric pressure are simulated by using the UDF program of CFD software. Characteristics including pressure, temperature and vapor fraction respectively for bubble, slug and annular flow regimes are extracted as the input characteristic vectors of the BP neural network and Elman neural network for the purpose of identifying the boiling two-phase (vapor/liquid) flow regimes within wall tubes. It reveals that the rate of recognition accuracy of flow regimes with BP neural network is up to 95.24%, as well as 100% with Elman neural network within the groups taken into consider. By analyzing relations between flow regimes, wall temperature and wall heat transfer coefficient, it is found that changes in flow regimes will cause drastic variation in heat transfer coefficient of the wall surface, and the coefficient reduces rapidly as the wall temperature increases and eventually converge to a minimum. It is a very effective method of using numerical simulation to extract the signal under poor experimental conditions, and is good reference for the further research.
Swept Blade Aerodynamics Numerical Simulation of Super-Critical HP Stage Static Cascade
Authors: Feng Zi Ming , Sun Zhen Xu , Zhang De Shi , Zhou Guang Ling , Li Chun Hong
Published: September 2010

Super-critical HP steam stage static blade cascade is as the prototype blade to numerical simulations. Different swept blades are made by changing the sweep angle and sweep height in order to study the effect of swept blade on aerodynamics characteristics of turbine static cascade. The numerical simulation sweep angle are made of ±10° and 0°,swept heights are 30% blade height. The turbine aerodynamics characteristics are analyzed by NUMECA software. The numerical simulation results indicate: that aft-sweep blades negative C-type pressure distribution increase the low energy fluid centralizing in end-wall corner and the end-wall secondary flow loss, but the loss is decreased at mid-span, depending on the baseline. But fore-sweep blades C-type pressure distribution decrease the low energy fluid centralizing in endwall corner and the endwall secondary flow loss, but the loss is increased at mid-span, depending on the baseline.
Numerical Analysis of Temperature Field in Laser Cladding on Teeth Surfaces of Gear Shaft
Authors: Chen Lie , Xie Pei Lin
Published: September 2010

Temperature field of laser cladding on teeth surfaces of gear shaft was numerical simulated with finite element analysis software – ANSYS. The simulation result show that the heat caused by laser beam is concentrated inside the tooth mostly. An effect of preheating in the adjacent tooth is also brought about by injected laser energy. In order to make use of the effect of preheating and avoid the concentration of heat, all of the corresponding flanks of teeth should be cladded first and the other flanks of teeth be cladded secondly in the process of laser cladding. It is also shown that the problems of excessive melted down and collapsing of tooth-tip would be easily resulted in by the heat that concentrated in tooth-tip if the tooth-side and tooth-tip be cladded at the same time. The results of analysis and experiment show that at least two times of scanning should be executed in the process of laser cladding on teeth surfaces. At the first scanning, dimension of laser beam should be reduced properly. And the tooth-tip should not be irradiated directly by laser beam. After the first scanning, the gear should be circumrotated a certain angle. And the included angles between the two sides of tooth-tip and horizontal plane should be approximately equal. Then the second scanning could be prosecuted at the tooth-tip. Experiment results show that continuous and compact cladding coat could be gained by this craft. It is proved that this technological craft is reasonable and effective.
Synthesis of Al2O3/AlB12/Al Composite Ceramic Powders by a New Laser-Induction Complex Heating Method and a Study of their Mechanical Properties
Authors: Huang Kai Jin , Yan Li , Kou Hua Min , Xie Chang Sheng
Published: September 2010

Based on the combined toughening principle, pure Al2O3/AlB12/Al composite ceramic powders have been synthesized using a new laser-induction complex heating method. This method starts from Al and B2O3 powder mixtures, after which Al2O3/AlB12/AlN composite ceramics were fabricated by hot-press sintering at 1600°C for 2h under the protection of a N2 atmosphere. XRD and SEM techniques were used to characterize the phases and morphologies of the powders and the ceramics. The bending strength and the fracture toughness of the ceramics were measured by the three-point bending method and the indentation fracture method, respectively. The results show that the pure Al2O3/AlB12/Al composite ceramic powders can be successfully synthesized by this new laser-induction complex heating method because the adiabatic temperature of Al-B2O3 system is more than 1800K. Al2O3 and AlB12 phases were formed by the liquid-liquid reaction mechanism and the liquid-solid reaction mechanism, respectively. The bending strength and the fracture toughness of the Al2O3/AlB12/AlN composite ceramics were 551.44MPa and 6.04MPa.m1/2, respectively. These values are 57.55% and 51% greater than those of the pure Al2O3 ceramic (350MPa and 4MPa.m1/2) due to the reinforcing and toughening in-situ formation of small AlN particles.
Fabrication and Gas Sensing Properties of Nano γ-Fe2O3/ZnO Double-Layer Film Gas Sensor
Authors: Huang Kai Jin , Yan Li , Xie Chang Sheng
Published: September 2010

The nano γ-Fe2O3/ZnO double-layer film gas sensor was fabricated by the screen printing technology and the hydrothermal method. XRD and SEM techniques were used to characterize the phases and morphologies of the film. The gas sensing properties of the gas sensor to ethanol were investigated. The result shows that the gas sensitivity of the gas sensor is higher than that of the nano γ-Fe2O3 single-layer film gas sensor and the nano ZnO single-layer film gas sensor. The high gas sensitivity of the nano γ-Fe2O3/ZnO double-layer film to ethanol was caused by the combined effect and nano effect.
Damage Identification of Composite Materials Based on PNN
Authors: Dong Xiao Ma
Published: September 2010

In recent years, there were been increasing researches focusing on the application of artificial neural networks in structural damage identification. Most of them perform well with numerical examples under error-free conditions, but become worse when the experimental data are polluted with measurement noise. In this paper, a dynamic approach based on PNN for damage identification of composite materials was proposed. By using wavelet series, the features of signals were extracted and input to PNN for training the network and identifying the damages. A performance comparison between the PNN and BPNN for structural damage identification was carried out. The results show that the proposed method can more exactly identify the faults than the BP neural network.
Dynamic Behaviors of a Rotor-Bearing System under Base-Transferred Shock Excitations Considering Journal-Bearing Clearance
Authors: He Shao Hua , Zhang Ping Hao , Wu Xin Yue
Published: September 2010

The past researches on the transient responses of rotor-bearing systems under shock excitations paid little attention on impact-contact-rub forces which would arise when taking journal- bearing clearance into account, and these forces’ influences on the overall responses remain unknown until now. In this paper, models of impact-contact force, rub force and oil-film force in a rotor-bearing system were built respectively. Numerical calculation was performed to obtain time-varying responses of those forces while the system suffers base-transferred shock excitations. Influences of those forces on system overall responses were investigated. The main conclusion is that the rub force has no obvious influence on the system responses during shock lasting time, whereas it shows an obvious inhibitory effect on the residual response, making time-varying amplitudes be smoother. Rub force maybe bigger in x direction than in y direction although shock energy in x direction is less than in the y direction. Influences of the oil-film force on response is similar to that of rub force but more severely. It has obvious influences on overall responses both during shock lasting time and residual time.
Dynamic Model of a Discrete-Pontoon Floating Bridge Subjected by Moving Loads
Authors: Jun Zhang , Liu Jun , Ni Xiao Lu , Li Wei , Mu Rong
Published: September 2010

A discrete-pontoon floating bridge is studied based on the beam model with assumption of the bridge deck as a elastic beam with uniform section, live load such as vehicle as moving concentrate forces, and pontoons as independent mass-spring-damping systems with singular degree of freedom. The comparison results of between vehicles and moving concentrated force show that a vehicle load can be simplified as one moving concentrated force. The present model can study not only a single moving load but also multiple moving loads.
The Soliton Control Research for the Nonlinear ITO System
Authors: Ma Yu Lan , Li Bang Qing
Published: September 2010

The exact soliton solutions are constructed by extending the (G'/G)-expansion method for the nonlinear ITO system. The soliton controls are investigated. The soliton shapes can be under the control of the parameters related to the (G'/G)-expansion method.
The Study on the Soliton Solution of the Generalized Burgers-Fisher System
Authors: Ma Yu Lan , Li Bang Qing
Published: September 2010

By introducing the (G'/G)-expansion method, the exact soliton solution is constructed for generalized burgers-fisher system. The two classes of soliton, namely, kink-like soliton and anti-kink-like soliton are studied for the system.
Damping Mechanism of Crack in Near Field from the Blasting Point
Authors: Qiang Ning , Xiang Fang
Published: September 2010

In controlled blasting, pre-cracks are often used to reduce the blasting vibration hazards. In this paper, with the engineering of 3 # on-line repair in one large iron and steel group in China, the kinetics of the steady one-dimensional shock wave, transmitting through the pre-cracks in near field from the blasting piont, were analyzed. And the damping effect was calculated too. Small-scale industrial test was conducted. These provide a reference for the blasting design.
Design and Simulation of a Tree-Based Intrusion Detection System against Denial of Service
Authors: Bai Yuan , Bai Zhong Ying
Published: September 2010

Based on analysis of relative and absolute traffic anomalies a fully DIDS(Distributed Intrusion Detection System) is built to detect and respond flooding DoS(Denial of Service) in a specific network area, using traffic trees as data structure to store, execute, communicate and combine abnormal data. A single component settled in a network element is called Tree-Devices and all Tree-Devices construct a Tree-DIDS, a fully DIDS. Tree-Devices communicate with other devices in three ways and collaborate to detect attacks, by which communication cost is reduced. Fully architecture avoids the single point failure, while double anomalies help to warn earlier. The simulation results and performance analysis show that Tree-DIDS works effectively.
Kinematics Simulation of Residues Cutting and Ridge Cleaning Equipment Based on ADAMS
Authors: Wu Shi Hong , Zhang Bu , He Feng Yu , Li Bao Fa
Published: September 2010

The residues cutting and ridge cleaning equipments of Ridge-tillage planter are important working parts which can prevent no-tillage planter from clogging and ensure good quality of seeding. For this, How to use ADAMS software to establish the simulation model of residues cutting and cleaning equipment is introduced, and the simulation analysis of its cutting residues and cleaning the ridge is done in this paper. Simulation results show that running results are in line with the theoretical analysis, which improved the design of residues cutting and ridge cleaning equipment of No-tillage planter.
Oriented Graph Signal Decomposition Model Based on TSF and its Application
Authors: Shen Li , Li Ya Zhen
Published: September 2010

Aiming to alleviate the limited test resource situation, oriented graph signal decomposition model is proposed based on the complex signal synthesis method of TSF(Test Signal Framework) in STD(Signal and Test Definition) standard. This paper establishes signal decomposition models for stimulus signal and response signal; which has carried on the detailed analysis and the discussion about this signal model. A series of recursion expressions are put forward to acquire the signal’s (physical characteristics’s of a signal) origination through the deduce process layer by layer. This signal model can be used for any complex signals, and has nothing to do with the specific equipment, while it is completely reusable and portable. When the platform’s independent resources cannot meet the signal requirements, by means of the signal model the combination of the independent resources can be used to achieve the automatic allocation of the stimulus /measurement resources. The signal model also provides an implementation approach that is used to the interchanges between synthetic instruments and the instrument combinations as well as the interchanges between the instrumens combinations. So that it can save the system resources and reduce the cost greatly.
The Segmentation of Textile Printing Image Based on the Algorithm of JSEG
Authors: Kang Xue Juan , Jing Jun Feng , Nie Lu Hua
Published: September 2010

This paper introduces a detecting approach about the textile printing precision based on machine vision. Firstly, the system uses the smart camera to capture the images, and then, the JSEG algorithm exploits the segmentation of textile printing image, obtaining the edge information of each region of the image. Finally, make a match for the standard segmented edge information, to obtain deviation area of the image, and calculate the deviation position. The experiment shows that the algorithm has a good color segmental effect on textile printing image, and it has a high detection accuracy.
The Detection System of Rotary Screen Printing Based on Machine Vision Technology
Authors: Li Peng Fei , Jing Jun Feng , Wang Bo
Published: September 2010

With the error detection problems in rotary screen printing, in this paper the machine vision technology is proposed to detect the design register error in the dyeing process, and the characteristics of the printing and dyeing contexture image are introduced, too. Combined with the features of " broken pattern " image, with the edge of the fabric image as characteristic curve, and through Fourier-mellin transform, the fabric image error detection is implemented; Finally, in the paper, the " broken pattern " error results show the feasibility of the scheme ,at the same time provide a theoretical basis for the further actual application.
Multi-Objective Optimization for Parameters of Energy Management Strategy of HEV Based on Improved NSGA-II
Authors: Hu Fei , Zhao Zhi Guo
Published: September 2010

Hybrid Electric Vehicle (HEV) provides fairly high fuel economy with lower emissions compared to conventional vehicles. To enhance HEV performance in terms of fuel economy and emissions, subject to the satisfaction of driving performance, multi-objective optimization for parameters of energy management strategy is inevitable. Considering the defect of the method which transfers multi-objective optimization problem into that of single-objective and the shortage of the Pareto-optimum based nondominated sorting genetic algorithm II (NSGA-II), the NSGA-II has been improved and then applied to the optimization in this paper. The simulation results show that each run of the algorithm can produce many Pareto-optimal solutions and the satisfactory solution can be selected by decision-maker according to the requirement. The results also demonstrate the effectiveness of the approach.
Method of Parallel Sequential Minimal Optimization for Fast Training Support Vector Machine
Authors: Tian Li Yan , Hu Xiao Guang
Published: September 2010

A fast training support vector machine using parallel sequential minimal optimization is presented in this paper. Up to now, sequential minimal optimization (SMO) is one of the major algorithms for training SVM, but it still requires a large amount of computation time for the large sample problems. Unlike the traditional SMO, the parallel SMO partitions the entire training data set into small subsets first and then runs multiple CPU processors to seal with each of the partitioned data set. Experiments show that the new algorithm has great advantage in terms of speediness when applied to problems with large training sets and high dimensional spaces without reducing generalization performance of SVM.
A New Algorithm for a Spatial Serial Robot
Authors: Huang Xi Guang , He Guang Pin , Li Duan Ling
Published: September 2010

In this paper a new algorithm to compute all the closed-form inverse kinematics solutions of a spatial serial robot. Based on the method, A 16th degree univariate polynomial of the spatial serial robot is obtained without factoring out or deriving the greatest common divisor. We also obtain all the closed-form solutions for the inverse kinematics of the robot. Finally a numerical example is given to demonstrate the algorithm process.
Solving RFID Networks Scheduling Problems Using Hybird Binary Particle Swarm Optimization Algorithm
Authors: Tang Jun
Published: September 2010

This paper presents an hybrid binary particle swarm optimization algorithm integration of genetic algorithms (HBPSO) to solve the RFID networks scheduling problems and get the optimal scheduling result in the problem. HBPSO is combined with advantages of binary PSO and GA. We use HBPSO to solve three problems of the RFID reader network and we attempt to minimize the total transaction time. By the results of the three problems, we can conclude that HBPSO is an effective algorithm which can find optimal solutions in the problem of the RFID reader network.
Adsorption of Dibenzothiophene on Transition Metals Loaded Activated Carbon
Authors: Yu Guo Xian , Li Ji Bing , Zhou Xiao Long , Li Cheng Lie , Chen Li Fang , Wang Jin An
Published: September 2010

Transition metal-modified carbon-based adsorbents were prepared by impregnating activated carbon with solutions of copper, cobalt or nickel chloride or nitrate. The mixtures were dried and then calcined under nitrogen stream. The surface metal species were analyzed by XRD technique and the surface oxygen-containing groups were characterized by FTIR. Their adsorption capacities for dibenzothiophene (DBT) were measured by using DBT-containing n-octane solution as model oil. Experimental results show that the metal species on the carbon surface could be controlled by the calcination process under nitrogen atmosphere. Both the transition metal precursors and kinds of metal species on the carbon surface have significant effects on DBT adsorption capacity.
Isomerization of Pinene with Al- and Ga-Modified MCM-41 Mesoporous Materials
Authors: Díaz-García M. , Aguilar-Pliego J. , Herrera-Pérez G. , Guzmán L. , Schachat P. , Noreña-Franco Luis E. , Aguilar-Elguezabal A. , Gutierrez-Arzaluz M.
Published: September 2010

In recent years the pharmaceutical and cosmetics industries have increased the usage of camphene, an intermediate for the manufacture of, for instance, camphor, anti-swelling drugs and K vitamin. Therefore, recent research efforts have been focused on developing new reaction paths towards a higher selectivity to camphene while avoiding other terpene by-products, such as p-cumene and limonene, which are of little industrial value. The aim of the present work was to study the structure and catalytic performance of Al- and Ga- substituted MCM-41 mesoporous materials for the α-pinene isomerization reaction. Both, Al and Ga, enhance the Brönsted and Lewis acidity of the parental MCM-41 material. At low conversion (± 10%) there was little deactivation, mainly due to the absence of secondary reactions; at higher conversion (± 50%) considerable amount of cyclic products are obtained.
Enhanced Electrochemical Oxidation of BH4− on Pt Electrode in Alkaline Electrolyte with the Addition of Thiourea
Authors: Yu Dan Mei , Chen Chang Guo , Lei Shu , Zhou Xiao Yuan , Cao Guo Zhong
Published: September 2010

The electrochemical oxidation of sodium borohydride (NaBH4) on Pt electrode in alkaline electrolyte with the addition of thiourea has been studied by means of cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and chronopotentiometry (CP). NaBH4 is readily to react with hydroxyl groups to release hydrogen through either direct oxidation or catalytic hydrolysis. The experimental results demonstrated that the addition of an appropriate amount of thiourea to the alkaline electrolyte resulted in the suppression of catalytic hydrolysis and diffusion of borohydride ions through the separation membrane.
Pd Nanoparticles Supported on TiO2 Nanotubes for Ethanol Oxidation in Alkaline Media
Authors: Yang Hou Hua , Qin Yuan Hang , Wen Sun , Zhang Xin Sheng , Niu Dong Fang , Ma Chun An , Yuan Wei Kang
Published: September 2010

Pd electrocatalysts supported on TiO2 nanotubes (TNTs) were prepared and used for the oxidation of ethanol in alkaline media. The morphology and structure of the TNTs and the Pd-TNTs/Ti catalyst were characterized by field emission scanning electron microscopy (FESEM). The FESEM results showed that the nanotube structure could be obtained after Ti anodized for 40 min at 20 V under 25 °C, and the nanotube length increased with anodizing time. TNTs/Ti40, TNTs/Ti50 and TNTs/Ti90 templates were prepared with Ti anodized for 40 min, 50 min and 90 min respectively. The composite catalysts activities were measured by cyclic voltammetry (CV), impedance spectroscopy and chronoamperometry. The results indicated that the Pd-TNTs/Ti50 catalyst had higher catalytic activity for ethanol oxidation compared with Pd-TNTs/Ti40 and Pd-TNTs/Ti90 catalysts.
Observation on the Structure of Ordered Mesoporous Materials at High Temperature via In Situ X-Ray Diffraction
Authors: Zhou Chun Fang , Zhu Jian Hua
Published: September 2010

This short paper reports the direct observation of the structure variation of mesoporous silica at temperatures higher than 600 oC by use of an in situ XRD technique. The mesostructure of SBA-15 or other mesoporous materials such as MCM-41 became almost invisible when the temperature rose to above 600 oC, but recovered or partially recovered once the temperature decreased. Contrarily, the characteristic XRD patterns of zeolites such as ZSM-5 kept unchangeable under the same conditions. On the basis of comparative experiments performed on various mesoporous samples, it is inferred that the reversible variation of XRD patterns probably originates from the thermal shock of the pore wall, not from the permanent collapse of the mesoscopic structure in these samples. This observation indicates the special features of SBA-15 at high temperature.
Synthesis of Si-Based Mesoporous Materials with Different Structural Regularity
Authors: Chen Li Fang , López Jesus , Wang Jin An , Noreña-Franco Luis E. , Yu Guo Xian , Cao Fa Hai , Song Yue Qing , Zhou Xiao Long
Published: September 2010

Two types of mesoporous Si-MCM-41 materials were synthesized via a cationic surfactant template method using different Si-precursors. The materials obtained were characterized by FTIR, XRD, BET, TEM and 29Si MAS-NMR techniques. When fumed silica was used as Si precursor, a Si-MCM-41-I solid with wormhole-like pore topologies was obtained. However, when tetraethylorthosilicate (TEOS) was used as Si precursor, a mesoporous Si-MCM-41-II solid with hexagonal arranges and a long-range ordered structure could be obtained. These two kinds of mesoporous materials had a uniform pore size distribution with an average pore diameter within 2.3-2.8 nm. Rather weak Lewis acid sites were formed on both the Si-MCM-41 samples prepared by the two methods.
Precision Mould Making – From Macro to Micro
Authors: Brinksmeier Ekkard , Osmer Jen
Published: September 2010

Nowadays several qualified technologies have been established for the manufacturing of precision moulds. The fields of application can mainly be divided into moulds for non-optical and optical components. For optical moulding inserts the development goes from basic rotational symmetric geometries to complex surfaces like steep aspheres and freeforms which can additionally be overlaid with microstructures. The moulded components require a figure accuracy in the (sub-) micrometer and surface roughness in the nanometer range while moulds for replication also need advanced materials with high surface integrity. Here, diamond machining processes, e.g. diamond turning and milling as well as precision grinding and polishing are necessary for the manufacturing of precision moulding inserts from various materials. Depending on the material and application of the applied part to be replicated different replication techniques are used like injection moulding of plastics, hot embossing and precision moulding of optical glasses. For non-optical applications the current technical progress is driven by miniaturized products which are typically produced in mass production by replication techniques like hot embossing or metal forming. Each of these processes requires specific properties of the mould. Therefore, the surface topography and tribological conditions are of particular importance.
Fabrication of a Beam Shaping Lens for Chip Scale Packaged LEDs
Authors: Joo Jae Young , Kang Chang Suk , Park Soon Sub , Lee Sun Kyu
Published: September 2010

In this paper, we demonstrated the machining process of a novel Light Emitting Diodes (LED) beam shaping lens, called TIR Fresnel lens, for GaN-based blue Chip Scale Packaged (CSP) LEDs. Upon achieving a precise alignment of the tool and identifying the best manufacturing condition, we have successfully fabricated a prototype of this lens on poly methyl methacrylate (PMMA) plate. The form error of the central aspheric lens was less than 1 μm deviation, and surface quality of the Fresnel facets were sufficient for Total Internal refraction without any burr or adhesion of the machined chip. Fabricated TIR Fresnel lens reduced the viewing angle of the testing CSP LED from 140° to 17.4° in FWHM. The proposed lens produced extreme compactness as well as high collimation efficiency, thereby applicable to an ultra-thin optical system.
Effect of Wheel Additive On Chemo-Mechanical Grinding (CMG) of Single Crystal Si Wafer
Authors: Takahashi H. , Tian Y.B. , Mikami Y. , Shimizu J. , Zhou Li Bo , Tashiro Y. , Iwase H. , Kamiya S.
Published: September 2010

Chemo-mechanical grinding (CMG) process is a promising process for large-sized Si substrate fabrication at low cost. However, effect of additive in CMG wheel is not completely understood yet. In this paper, three different CMG wheels were developed, in which one excluded additive and the other two contained two kinds of additive i.e. silicon dioxide and sodium carbonate. Grinding experiments were conducted to explore the influence of exclusion of additive and inclusion of different kinds of additive on CMG performance. The grinding characteristics of the three wheels were also analyzed and discussed to reveal the roles of wheel compositions in CMG process. This work provides some fundamental insights for the selection of different types of additive for optimization of CMG wheel.
An Experimental Study on Microcutting of Soda-Lime Glass by Milling Process
Authors: Arif Muhammad , Rahman Mustafizur , Wong Yoke San
Published: September 2010

Glass is an important engineering material. It is widely used in semiconductor, optical, micro-electronics and many other fields. However, glass is not amenable to machining with conventional approach because of its low fracture toughness. To achieve high quality surface finish on optical components, glass must be machined in ductile mode. Compared to single point cutting processes, end-milling can achieve improved material removal rate in machining fracture free surface on brittle material. This paper presents the results of an experimental investigation into microcutting of glass by end-milling. Side-cutting tests have been performed on soda-lime glass workpiece at multiple feeds and radial depth of cuts to obtain fracture free machined surface. The tests were designed to investigate the effect of feed per edge and radial depth of cut on the cutting mechanism at low cutting speed. Experimental results indicate that feed per edge is the most dominant factor that dictates the occurrence of brittle-ductile transition point in the milling process of glass. It has been proved experimentally that fracture free surface can be machined on glass at high radial depth of cut if the feed per edge is sufficiently small.
Investigation of Copying Rate of Tool Motions on Workpiece Profile
Authors: Kono Daisuke , Matsubara Atsushi
Published: September 2010

The copying characteristic of the tool motion on the workpiece profiles is investigated. Assuming that the workpiece profile consists of sinusoidal-wave components, the amplitude ratio between the workpiece profile and the tool motion is defined as copying rate . An experiment was conducted to identify in shaping of electroless plated nickel. With polycrystalline diamond tools, the copying rate was obtained as =1.16. The result indicates that the amplitude of the workpiece profile can be larger than that of the tool motion. Shaping of slot profiles was carried out to investigate the influences of depth of cut, rake angle and relief angle on the copying characteristic. The depth of slot was larger than the tool displacement in the Z-direction by 0.1-0.4 μm when the rake angle was -5 degrees and the relief angle was 12 degrees.
Efficiency and Wear Behavior of the Abrasive Flow Machining Processing
Authors: Wang A Cheng , Liu Chun Ho , Lin Yan Cherng , Pai Shiuan Hau
Published: September 2010

This study attempts to determine how AFM affects the polishing of complex hole to achieve a smooth surface by examining WEDM efficiency when cutting a complex hole for various degrees of surface roughness. This research showed the complex holes with the chain shape of the mold steel were cut by WEDM first, however, there were three kinds of the average roughness in the hole surface (1.3μm Ra, 0.8μm Ra and 0.4μm Ra) when three cutting processes of WEDM were used to manufacture the complex holes. Then silicon carbon (SiC) or diamond abrasive (DA) mixed with the silicone gel was utilized as abrasive medium to polish these holes, machining processes were finished when the surface roughness of the complex holes were decreased to the steady values in AFM. Finally, three surface roughness of the complex hole in the different positions would be used to judge the finishing surface was smooth or not, and machining time of the complex holes between WEDM and AFM was utilized to evaluate the efficiencies of these process when the surface of the complex holes had uniform roughness after machining. The results showed that surface roughness would not easily uniform after AFM until the cutting roughness, produced by WEDM, reduced to 0.4μm Ra when SiC was utilized as abrasive. But the surface roughness would uniform after AFM only the cutting roughness reached 0.8μm Ra when DA was used as abrasive, and the total machined time to a uniform roughness (WEDM+AFM) was the less (45 minutes) when the cutting roughness with 0.8μm Ra was utilized as original surface roughness.
Analysis of Motion Trajectory and Dwell Time of Abrasive in Magnetorheological Finishing with Tiny-Grinding Wheel Cluster
Authors: Chai Jing Fu , Yan Qiu Sheng , Lu Jia Bin , Kong Ling Ye
Published: September 2010

Based on the analysis of the machining process of magnetorheological finishing with the tiny-grinding wheel cluster, the motion model of abrasive in the tiny-grinding wheel cluster was proposed to describe the motion trajectory and the dwell time of abrasive relative to the surface of workpiece. Then, the experiment was applied to study the effects of the motion trajectory and the dwell time on surface quality and machining efficiency of the workpiece. According to the analysis, a method to improve surface quality and machining efficiency in MRF with the tiny-grinding wheel cluster was presented.