bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of Material Parameters Wave on Sheet Metal Springback Using Orthogonal Design Simulation
Authors: Chen Lei
Published: August 2011

Springback is a common phenomenon in sheet metal forming, caused by the elastic redistribution of the internal stresses during unloading. The aim of this search is to investigate the wave of material parameters on the results of forming and springback of sheet metal. A finite element model of cylinder bending benchmark of NUMISHEET’2002 was proposed firstly to simulate bending and springback with contact evolution between tools and blank based on static implicit method. The simulation results agree well with the experiment. Then the effects of the wave of material parameters on forming and springback results are investigated using orthogonal design simulation. Eight factors are investigated with the orthogonal label. The results show the factors have different effects on both the forming and springback. And the significance of the factors is shown through direct analysis of the results.
Influence Regularities of Axial Force of Cross Wedge Rolling Symmetric Shaft-Parts about Technical Parameters
Authors: Shu Xue Dao , Sun Bao Shou , Xiao Min
Published: August 2011

Because of unbalanced axial force of cross wedge rolling asymmetric shaft-parts causing the rolling play and not stably, it is key factors to restrict application in asymmetric shaft-parts of cross wedge rolling. Axial force balance depends on technical parameters. So the influence regularities of axial force to technical parameters is researched in this paper by Ansys-Ls/Dyna finite element software. Finite element model is authenticated by experiment of rolling force, and the influence regularities of axial force of cross wedge rolling asymmetric shaft-parts is get. It will provide a theoretical basis for choosing reasonable parameters in mold design of cross wedge rolling asymmetric shaft-parts.
Numerical Simulation of Solidification by SPH in Sand Cast Process
Authors: He Yi , Zhou Zhao Yao , Cao Wen Jiong , Yang De Zhi
Published: August 2011

In this paper, Smoothed Particle Hydrodynamics (SPH) was used for the prediction of heat conduction problems in sand cast process. The implementation of solidification modeling in a curved casting based on SPH has been described. The treatment of latent heat was introduced in SPH conduction problem by temperature compensation method, which demonstrated the role of latent heat has a great influence on the heat distribution in the casting. The temperature distribution calculated by SPH provided a great agreement with those computed through numerical software MSC.Marc, which validated the efficiency and precision of SPH simulation of heat transfer problems in sand cast process.
Finite Element Analysis of Vehicle Engine Connection Rod under Mechanical Load
Authors: Wen Li Zhi , Guan Zhi Wei , Song Jian Feng , Chen Yue
Published: August 2011

In this paper, the model of the engine connection rod is founded by use of UG, and then joined in the ANSYS, applied the Multiphysics module and static structuer analysis function, we can count the stress field of the connection rod and accomplish the evaluate of the mechanical load.
Optimal Design of Triangle Fastening Screw Thread's Turn Number
Authors: Chen Jian Min , Zhang Meng , Deng Jia
Published: August 2011

The paper firstly numerically simulates the coupled model of triangle fastening screw threads in the application of ANSYS software. Calculate stress intensity of the screw thread on the axial pressure of 200MPa. The fittest coupled turn number of the screw nut is designed to make sure the strength of coupled teeth and make every turn of the screw thread go on very well and also save material. The maximum equivalent stress of the screw thread changes linearly with the axial pressure. The stress of the thread's root is greater than that of the thread's top so that the root is easily damaged. The paper's research method can apply to the optimal design of the other patterns of screw thread's turn number.
Experimental Study on Hot Bending of 22MnB5 Steel
Authors: Guo Run Qing , Ying Liang , Hu Ping , Guo Wei , Han Xiao Qiang , Meng Zhao Huan
Published: August 2011

Special V-shaped heat bending test was designed for 22MnB5 hot forming steel of different thicknesses. Blanks after heating 5 min at around 950°C to austenize fully were bended at different temperature conditions, and simultaneously the spring-back behavior and microstructure features of heat bending specimens were investigated. The result shows that 600-650°C temperature zone is optimal for bending forming and martensite texture transforming. Real hot forming anti-collision beams were produced at 600-650°C and comparison bending test was conducted to reveal more qualified mechanics at this temperature zone.
Numerical Simulation of Temperature Field and Experimental Verification during Micro-Detonation of Arc Strike Machining
Authors: Tian Xin Li , Lin Ke Ling , Zhang Bao Guo , Xue Chun Fang
Published: August 2011

A theoretical model of heat transfer for Si3N4 ceramics during micro-detonation of arc strike machining was established. Based on finite element theory, the temperature of Si3N4 ceramics during micro-detonation of arc strike machining was simulated with the aid of COMSOL Multiphysics software, combined with the actual processing, the width and depth of crater impacted by micro-detonation were calculated. The simulation results show that the highest temperature of Si3N4 ceramics is over 12100 °C in a given processing parameters, while the high-temperature zone is quite small; the material removal rate with the increase of pulse width and electricity increases, with the increase of the nozzle radius first increases and then decreases; the diameter to depth ratio with the increase of pulse width and electricity decreases, with the increase of nozzle radius increases. The data gained from the simulation is proved to be accordant with the data gained from experiments.
A New Single Step Full Discrete Scheme for a Semilinear Second Order Hyperbolic Equation
Authors: Deng Kang
Published: August 2011

In this paper, we study a simplified single step full discrete scheme for a class of semilinear hyperbolic problems of second order. At first we obtain a system of second ordinary differential equations with initial value by use of spatially discrete finite element approximation with interpolated coefficients. Next in terms of a single step scheme to the time variable for this system we gain a fully discrete scheme with high accuracy. Finally we give the stable and convergence of the full discrete schemes.
Finite Element Analysis of High - Pressure Grinding Mill
Authors: Liu Yi , Li Ji Shun
Published: August 2011

The stress distribution of the high - pressure grinding roller is an important index of the grinding mill design. A simulation model of high - pressure grinding roller is created by means of finite element method (FEM), utilizing the FEM software ANSYS. At first, the paper calculated the pressure of the high - pressure grinding roller by the grinding materiel mathematical model. Secondly, a physical model is set up material characteristics is defined and the areas are meshed, then the border conditions are established, finally loading and solving are made. The result of the FEM simulation indicated the mathematical model of the grinding materiel is rational.
The Influence of Process Parameters on the Branch Height for Air Handling Unit
Authors: Wen Hua Dian , Xiao Xiao Ting , Tan Li Guang , Zhang Kai , Chen Ying
Published: August 2011

Multi-way tube on air conditioning header is considered as the research objective .Finite element simulation method is utilized to simulate and analyze the influence of process parameters on branch height such as branch diameter、branches distance、branch numbers、tube thickness and die fillet radius. The result shows that with the increase of branch diameter, die fillet radius and tube thickness, the branch height increases. It also shows that with the increase of branch numbers and branches distance, the branch height decreases generally.
Comparative Study of Creep and Stress Relaxation Behavior for 7055 Aluminum Alloy
Authors: Zhan Li Hua , Li Yan Guang , Huang Ming Hui , Lin Jian Guo
Published: August 2011

In order to study the similarities and dissimilarities between creep and stress relaxation behavior of age formed aluminum alloys, both creep ageing and stress relaxation ageing experiments have been conducted with plate shaped 7055 aluminum alloy specimens on the 100 KN tensile testing machine performed at 120 °C for 20 h, under different stress levels from 190.0 to 357.8 MPa. The experimental results show that similar variation trends for creep and stress relaxation behavior were observed. Both creep and stress relaxation curves can be divided into two stages. During the first stage, higher creep rate and stress relaxation rate occur, which increase with stress levels but decrease with ageing time. While during the second stage, both the creep rate and the stress relaxation rate reach its lowest value and keep constant. A set of unified creep ageing constitutive equations has been developed and calibrated from creep experimental data, which can be used to predict the creep strain under age forming conditions perfectly. But the experimental results from stress relaxation ageing tests cannot be predicted with the established creep ageing constitutive equations, which shows that there is not a one-to-one correspondence between creep and stress relaxation, creep deformation is the most important but not the only reason for stress relaxation under age forming condition.
Study on Spinning of Pentagonal Cross-Section Hollow-Part Based on Orthogonal Experiment Design
Authors: Xia Qin Xiang , Wang Ying Pin , Yuan Ning , Cheng Xiu Quan
Published: August 2011

The investigation of the effect of processing parameters on forming quality has been one of the highlight researches in spinning. The thickness distribution is an important criterion to evaluate the forming quality. Spinning force affects the processing and equipment design greatly. Combining with the FEA simulation and orthogonal test method, taking the maximum reduction ratio in thickness of workpiece and the maximum spinning force as the evaluation criterion, the esequence of the main forming parameters, such as the feed rate and roundness radius of roller, and the relative height of workpiece were analyzed based on an orthogonal scheme of three-factor and three-level. Both FEA simulation and experiment results show that, during the pentagonal section hollow-part spinning, the influence sequence on the maximum reduction ratio in thickness is relative height of workpiece, feed rate and roundness radius of roller; the influence sequence on the maximum spinning force is relative height of workpiece, roundness radius of roller and feed rate.
Mechanism and Experimental Research on Copper and Copper Alloy's Manual SHS Welding Technology
Authors: Qu Li Feng , Xin Wen Tong , Wu Yong Sheng , Wang Sen
Published: August 2011

Copper and copper alloy are more difficult to weld than steel in terms of many reasons. As a new technolsgy, copper and copper alloy’s manual self-propagating high-temperature synthesis (SHS) technology was introduced in this paper. Through research of weld and analysis of manual SHS welding process, mechanism of copper and copper alloy’s manual SHS welding is expounded. This type of weld was only researched in terms of some aspects, including welding method, weld technique parameter, weld operate technique. The chemical compositions of the weld rod was the key to the final weld quality. The powders include thermit, slagging elements and alloying addition. When the content of (CuO+Al) was 60%wt~80% in the thermit, the rod showed excellent combustion behavior and the test plates H62 were welded successfully. The slag system of CaO-Al2O3-SiO2 have the lower melting point and high deformation power, which fit to meet the need of the weld slag system of copper and copper alloy’s manual SHS welding. The high melting point Al2O3 can be digested and absorbed in two ways, generating CuO•Al2O3 ceramics and reducing the melting point to float upward into slag with the help of the solvent.
Spatter Feature Recognition during High-Power Disk Laser Welding
Authors: You De Yong , Gao Xiang Dong , Katayama Seiji
Published: August 2011

The spatters created during laser welding are considered as essential information for welding quality inspection. This paper proposes a laser welding quality inspection method based on the high-speed visual detection. A high-power disk laser bead-on-plate welding of Type 304 austenitic stainless workpiece was experimented and two high-speed cameras were used to capture the spatter images. Spatter feature parameters were extracted by image processing, and the spatter volume was used to evaluate the welding quality. By comparing the spatter information with molten pool width, this paper investigates the internal relation between the welding quality and the spatter feature parameters. Experimental results proved that the proposed spatter feature extraction method help to guarantee an accurate evaluation on the quality of high-power disk laser welding.
A New Processing Way for Helicoid Reflective Mirror
Authors: Hu Shao Lei , Xie Yong Jun , Zhao Xin
Published: August 2011

A novel processing way for the continuous helicoid reflective mirrors is proposed. We use an intelligent oven to accurately control the glass temperature and successfully produce a helicoid reflective mirror in B270 glass. Then we test the shape and optical properties of the helicod reflective mirror via the three-coordinate instrument measuring and interference experiment.
Diffusion Bonding of 3Y-TZP and SUS440 by Using of Ti-Cu Powder/Sheet
Authors: Ju Dong Ying , Zhao Ming
Published: August 2011

This paper is mainly a study the diffusion bonding of 3Y-TZP/SUS440 by using the chemical bonding method. In the bonding interface of 3Y-TZP and SUS440, the Ti-Cu (brass) powder/sheet was used as bonding materials. After bonding process, multi-alloy field with Fe-Ti and Fe-Cu have been confirmed by EPMA determination. Through the microstructure observed by AFM and SEM, bonding boundaries of 3Y-TZP/SUS440 by Ti-Cu powder/sheet had good formation. The distribution of the residual stress on near interface was measured by XRD method. By using of these results, the mechanism of the ceramic and stainless steel was discussed.
Interface Structure of Be/HR-1Stainless Steel by Vacuum Diffusion Bonding
Authors: Li Hui , Zhou Shang Qi , Kong Ji Lan
Published: August 2011

Be and HR-I stainless steel with AgCu28 as an interlayer was diffusion bonded by hot pressing，The microstructure，distribution of composition and phase，mechanical properties of the joints were analyzed using scanning electron microscopy(SEM)，scanning auger microspectroy(SAM)，x-ray diffraction(XRD) and material testing machine，and the relationship between composition and structure and properties，and the effect of interlayer materials AgCu28 alloy were also discussed．The results show that good joint can be obtained using AgCu28 alloy as an interlayer material，because it can reduce the mutual diffusion between beryllium and stainless steel elements，the formation of brittle intermetallic compounds between beryllium and stainless steel elements are avoided effectively to improve the diffusion bonding strength and properties．
An Analytic Model for Electron Mobility in Strained Si/Si1-xGex nMOSFETs
Authors: Li Bin , Liu Hong Xia , Li Jin
Published: August 2011

In order to describe electron transport properties in inversion layer of strained Si/Si1-xGex nMOSFETs, a new analytic electron mobility model is proposed. The model not only takes into account the effect of germanium(Ge) content on phonon scattering-limited mobility and surface roughness-limited mobility, and but also includes the degradation effect of strained Si film thickness and temperature on the device mobility. For various Ge content and a wide range of normal electric field, temperature and strained Si film thickness, the model provides good agreement with the experimental data in references. In addition, the model can be expressed using the analytical expression and can be easily included in the device simulator.
Design of Measurement and Control System for a High-Performance TEM Based on Embedded PC
Authors: Chen Zhong Ren , Wang Hui , Chen Fang Jing
Published: August 2011

For transient electromagnetic meter home-made, there are some disadvantages, for example early signal detection is difficulty, and speed and accuracy of signal acquisition is no high. Therefore a high-performance TEM based on embedded PC is designed to overcome these disadvantages. And its main part is measurement and control system, which design is mainly introduced. The system consists of a transmitter and receiver modules, which hardware block diagram and schematic design are introduced in detail. Laboratory tests for the system developed show that the electromagnetic transmitter module has advantages of short off-time and high transmitting current detection accuracy; the electromagnetic receiver has advantage of high sampling speed, big dynamic range and achieving accurate measurement of early signal. Laboratory test results are satisfactory.
Study of Alumina Concentration Control Based on Intelligent Characteristic Model
Authors: Zhou Tian Pei
Published: August 2011

In electrolytic aluminum production processing, the measurement and control of alumina concentration is one of the three most important control aims. However, due to alumina concentration can not be measured directly and continuously online, and electrolytic aluminum production process is nonlinear, time-varying and large delay, which can not be described through the mathematical analysis model. Therefore, efficient and reliable development of alumina concentration control method is very important. In view of the above problems, alumina concentration is controlled by intelligent characteristic model and single neural adaptive PID controller, which achieve a good control effect.
LPV Modeling of Buck Converter and Gain Scheduling Control
Authors: Lin Guo Xian , Xie Wei
Published: August 2011

A kind of gain scheduling control is designed for Buck converter. The small signal model of the Buck converter is translated into the Linear Parameter-Varying (LPV) dynamic equation with the load and the line voltage as the scheduled parameters. Based on it, the closed-loop system poles assignment is taken to the specific area with gain scheduled state feedback via linear matrix inequalities (LMIs) technique, the gain scheduled state feedback is designed to regulate the duty cycle of the switch conduction. Compared with robust state feedback control, it has better disturbance rejection performance.
The Development of an Axial Piston Pump Prototype for Seawater Desalination and its Application
Authors: Zhou Hua , Zhai Jiang , Jin Cong , Luo Kai
Published: August 2011

High pressure pump is one of the key components in Sea Water Reverse Osmosis (SWRO) desalination project. This paper introduced the development of an axial piston pump prototype which used as a high-pressure pump in SWRO desalination system. After the structure and technique data of the pump were illustrated, the main manufacturing processes of the prototype were introduced. The performance test of the prototype was carried out on an integrated water hydraulics test rig. After this, the prototype was used as a high-pressure pump on a SWRO experimental system. The test and application results prove that the pump is more efficient and quiet than other types, and is suitable for being used as high pressure pump in small and medium scale SWRO desalination project.
Silk-Screen Print Technique in Laminar Flow Control
Authors: Wang Jue , Li Dong
Published: August 2011

Silk-Screen Print Technique was used to print roughness elements at the leading edge of a swept wing for crossflow (CF) dominated Laminar Flow control (LFC) in fluid dynamics. Crossflow was studied to be sensitive to the spacing and height of the roughness elements, as well as the density of the metal ink. Experiments in our research showed silk-screen print technique can precisely print the elements to dominate to delay transition.
Lateral Control of Roll-to-Roll System Using Fuzzy Control Logic and Vision Sensor
Authors: Xin Li Li , Hoang Nguyen
Published: August 2011

We report in this paper the control work of lateral displacement of a web that runs on a roll-to-roll system. The control system employs a displacement guide and a vision sensor. The vision sensor is used to detect the lateral displacement of a moving web and send a feedback signal to a controller. A fuzzy logic is developed and embedded in the controller. Experimental results are presented to evaluate the control logic and system.
Development of Embedded Control System of Micro-Flow Variable Plunger Pump Based on Frequency Control
Authors: Wu Huai Chao , Lu Fang
Published: August 2011

In order to break through the traditional flow change way of the variable plunger pump, a kind of micro-flow variable plunger pump with stepper motor is designed; and on this basis, the main control electric circuit of the pump is developed by taking AT89C52 single-chip microprocessor as MCU and making use of the keyboard and display circuit and three internal timers of AT89C52; the driving circuit is developed by using chapped wave driving model implemented by the chips of L297 and L298N; the software of the system is also developed. The joint debugging results of hardware and software indicate that the developed embedded control system not only implements the numerical driving of the pump, but also carries out the frequency control of the pump by changing the input frequency and duty ratio, additionally, the control of the whole system is flexible and the operation is simple.
Microstructure Evolution and Control of 30Cr2Ni4MoV Steel During Hot Forming
Authors: Zhang Xiao Xun , Sun Yun Hua , Zhu Ye Ling
Published: August 2011

Prediction and control of the microstructure to improve product performance are very important for the industry practice. In this study, microstructure evolutions of 30Cr2Ni4MoV steel under different conditions were simulated by changing the process parameters using the Deform 3D software. Effects of the forming process parameters on the microstructure were revealed: (1) the higher the temperature and the lower the strain rate, the smaller the strain are needed for the dynamic recrystallization; (2) when strain is enough, the higher the strain rate, the easier the uniform and small grain size can be obtained; (3) under a certain strain rate, the grain size increases as the deformation temperature increases. The microstructure of metal can be predicted and controlled according to the effects of hot forming process parameters on the microstructure evolution.
Beam Spreading of Partially Coherent Beams Propagating through Turbulence Atmospheric in Boundary Layer
Authors: Gao Ming , Lv Hong
Published: August 2011

The cross-spectral density function of the partially coherent beam on 1.06μm is extended based on the generalized Huygens-Fresnel principle by using the Gaussian Schell-mode(GSM) and the modified Frehlich spectrum. And on the analysis of variation of the beam spreading radius w with the initial emission radius w0, zenith angle θ and propagating distance z, the intensity distribution and beam spreading of GSM beam through atmospheric boundary layer turbulence are obtained under different distance. The results show that the beam spreading can be reduced at long distance for the suitable w0 according to the inflexion value of the curve. As well as, simulation results demonstrate that the modified Frehlich spectrum and the modified von Karman spectrum have little difference on the beam spreading for partially coherent beam propagating in atmospheric boundary layer turbulence.
Analysis and Testing of the Dynamic Performance of Tooling System
Authors: Shen Chun Gen , Wang Gui Cheng , Wang Shu Lin , Liu Gang
Published: August 2011

In this research, a linear-elastic FEM (finite element method) model of tooling system under the unconstrained condition was established for a BT40 tooling system. The natural frequency and the modal shape of the tooling system computed from the FEM analysis were verified against the structural modal parameters obtained from experimental modal analysis. In the basis of rational FEM model of tooling system, the changing law its length and diameter influence to structural modal parameters was investigated. After that, with the machine vibration testing of spindle raising speed idle running, further study on the law about the changing length and diameter of tooling system influence to vibration characteristic of spindle-tool system, the researched results will be a theoretical basis to evaluate the dynamic performance of other type’s tooling system.
Investigation of Numerical Simulation in Combustion Chamber Predictability
Authors: Xu Rang Shu , Niu Ling , Weng Xin Zhu , Xu Long , Bai Min Li
Published: August 2011

For the purpose of increasing applicability of combustion chamber simulation, computational domain, boundary condition, simplicity of complicated structures, mesh generation and physical parameters are investigated in this paper. An annular combustion chamber of some aero-engine is studied by means of predictive numerical simulation. The computational domain includes diffuser, swirler, inner flame tube, inner ring of combustion chamber and the flow channel of all the holes on the wall of flame tube. The film cooling holes row was simplified into a slit filled with porous media. Realizable k-turbulent model and non-premixed combustion model were adopted. Model of pressure atomization nozzle were calibrated and validated through inner nozzle flow property two-phase flow VOF model and experimental data. Physical parameters are express through polynomial functions. A commercial CFD code was adopted on a high performance computing cluster with parallel algorithm and the solving method are high-order discretization scheme. The velocity, pressure, temperature, fuel spray, density of fuel and productions, etc. are calculated and validated with the experimental data.
Numerical Simulation Analysis of Centrifugal Pump Floating Ring Seal
Authors: Han Jian Yong , Chen Guo Jing
Published: August 2011

According to the studying on the force analysis of floating ring of centrifugal pump, the paper think that floating ring stress will change with the change of centrifugal pump’ s condition. Using fluent software, the floating ring seal was simulated and analyzed. Results show that the liquid force acted on the floating ring is nonuniform and asymmetrical as wedging effect, and that section maximum pressure is not lies in the smallest clearance place, but in the wedge area where liquid flows to the minimum clearance, because the effect of Leak resistance is better in high pressure than low pressure. The leakage decreases and liquid resistance increases with the increases of RPM. The leakage increases with the increases of differential pressure in sealing ring sides and eccentricity. Pressure distribution within the seal clearance is not uniform with the increases of eccentricity.
Research on Multiple Simultaneous Faults Diagnosis of Hydropower Unit
Authors: Cao Lin Ning , Li Shu Ming
Published: August 2011

The multiple simultaneous faults diagnosis is not deeply studied so far. The methods for multiple simultaneous faults diagnosis are put forward. According to the characteristics of hydropower unit, the hierarchical faults decoupling methods are discussed in detail. The simulation calculation of the cylinder controlled by valve is taken as an example for decoupling of hierarchical fault .
Application of Wavelet-Based Fractal Dimension Threshold Denoising Method to Load Time History of Engineering Vehicle
Authors: Zhang Ying Shuang , Wang Guo Qiang , Wang Ji Xin , Yang Li Juan
Published: August 2011

The load time history signal of engineering vehicle is usually polluted by various nonstationary and stationary noises in the field test. An approach based on wavelet transform (WT) and fractal dimension (FD) is proposed in order to improve the adaptability and efficiency of denoising. This method initially decomposes the original signal into detail and approximation space in the WT domain by WT-based multiresolution decomposition. The short-time fractal dimension of detail coefficient is calculated at each scale. After the application of the binary processing to the short-time fractal dimensions, the locations where the thresholding of the detail coefficients has to be executed are ensured. The desired load signal is provided by applying WT-based multiresolution reconstruction to the processed detail coefficients and the unprocessed approximation coefficients. The proposed method is applied to an actual load time history signal of engineering vehicle. And the performance of this method is compared with that of the WT-based hard thresholding denoising method. The results show that this method is an alternative way to process the load time history signal of engineering vehicle.
Comparative Study on the Structure and Properties of Japanese and Self-Made Precursors
Authors: Ji Bao Hua
Published: August 2011

In order to release the important information on the structural constitution of Japanese precursor, comparative study on structure and properties of Japanese and self-made precursors were carried out by X-ray Diffraction (XRD), infrared spectrometer (FTIR), element content analysis and the breaking tenacity. It was found that Japanese precursor contains cyano group (–CN) and may contain styrene sulfonic acid amine, while not containing the carboxyl and ester carbonyl, that is, not containing MA. The XRD pattern of Japanese precursor around 10° appears a new crystalline diffraction peak, and the crystal size becomes lower. The cross-sectional shapes of Japanese precursor are circle, with uniform and compact structure, thus its mechanical properties is superior.
Detection of 3D Position of Object Using Four-Quadrant Photoedetector
Authors: Huang Zhen , Tang Xiao Jun , Liu Jun Hua
Published: August 2011

On the basis of building the mathematic light-path model of four-quadrant photodetector, three dimensional(3D) position monitoring system of an object is built. For the 3D position, pitching, orientation and rolling departure are included. The monitoring results indicate that position monitoring with four-quadrant photodetector is practical, economical and precise. And the testing precision can be corrected to the degree of second. So the theoretic basis for the further research and application of photodetector without calibrating experiment sample data is founded.
Discussion on the Green Design in Costumes
Authors: Liu Wen
Published: August 2011

In recent years, the consumers’ demand for costumes tends to become environmental protection, security and health from traditional utility, beauty and durability, and the costumes tend to be more comfortable, simple and natural. The idea of green design in costumes shall become dominant in costume designing. The article mainly elaborates the green designing idea and its necessity of application in the costume from surface materials, color, structure, production and marketing.
Precise Numerical Control Electrochemical Machining for Integral Impeller with the Adding Wobbly Feeds
Authors: Zhu Yong Wei , Xu Jia Wen
Published: August 2011

Lots of integral impellers are used in the new kinds of jets. The jet engine weight can be lightened much, and the thrust,work life and the safety coefficient can be increased remarkably. Based on the integral impeller’s structure features and the processing difficulties with special complex blades, the shaping law on electrochemical contour evolution machining the blades is analyzed and studied, the multi-axis linkage movement feed tracks are designed optimum by the shaping laws and the tests. The combined cathode with the reasonable flowing fields is designed, there is an eccentric between the cathode sole plate and cathode body, the bidirectional feeds method is adopted, the short circuit and electro-discharged sparks damages are eliminated. The redundant rests in blades back is removed by adding wobbly feeds. Machining tests are carried out. The blades satisfying precision are produced.
Polytetrafluoroethylene Mesh for Many Types of Blueprinting Machine: Preparation and Characterization
Authors: Hu Si Qian , Wang Hai Ping , Zhang Yu Min , Zou Xin
Published: August 2011

Adopting domestic polytetrafluoroethylene (PTFE) turning plate as materials, a new isosceles triangle macroporous mesh was designed. The correspond mould and the special fixtures for continuous punching of ultra-thin plastic sheet were successfully developed. The PTFE mesh was manufactured through computer numerically controlled (CNC) punch. In terms of electronic universal testing machines and microcomputer differential thermal balance, mechanical properties and thermostability of the PTFE mesh were studied. The results indicated that the tensile strength of PTFE mesh is 11.98 MPa which is greater than the literature value of 7.77 MPa, and its heat-resisting performance is excellent without decomposition prior to 312 oC.
Optimization of Hydraulic Pressure for Continuously Variable Transmission
Authors: Kuo Kei Lin
Published: August 2011

Compared to conventional transmission layouts, Active continuously variable transmission (CVT) provides smoother gear shifting and gear ratio in smaller increments, and is, therefore, more accommodating the needs of both the driver and passengers. A few notable improvements are enhanced passenger comfort, higher transmission efficiency, and improved acceleration. Incorporating all of the above qualities has become a major developmental focus for the automotive industry, and the potential for improvement warrants further investigation. A CVT controls the gear ratio by changing the diameters of the primary (input) and the secondary (output) pulleys by adjusting the hydraulic pressure applied to each using valves. Hydraulic pressure in the channel is developed using a basic pump connected to the input shaft. Excess pressure produced at higher speed is wasted. This study aims to minimize this hydraulic pressure without affecting the transmission’s performance, in order to conserve energy. A user interface was set up and the CVT’s torque converter was modified such that the inner and outer shafts could be operated independently, allowing for full control of hydraulic pressure .This experiment successfully achieved, via a custom LabVIEW program, its goal of controlling the gear ratio between the primary and secondary pulleys whilst operating at lower pressures to those specified by the manufacturer. This proves that it is possible to fully control the CVT whilst operating at a reduced hydraulic pressure.
Design and Experimental Test of ER Fluid Based 3-DOF Haptic Master System for MIS
Authors: Lim Seung Gu , Nguyen Phuong Bac , Choi Seung Bok
Published: August 2011

This paper presents a new design of an electro-rheological (ER) fluid-based haptic master device that is used for a minimally invasive surgery (MIS). This device consists of a bi-directional ER clutch/brake and an ER brake from which a repulsive force is realized. First, the modeling of these clutches/brakes is conducted. In addition, to transmit a complex rotation from the handle of the device to three independently rotary movements, a gimbal mechanism is adopted. At last, in order to evaluate the repulsive forces generated from the device, an experimental test is undertaken.
Design of the Control Motor in Money Counter
Authors: Tao Rui Min , He Wei , Xiong Chun Ru
Published: August 2011

This paper introduces a design of control motor in automatic money counter to deal with the issue that is over-count when facing counterfeited, polluted and incomplete notes. It is commonly required that the counter turns into stop status within tens of milliseconds. The advantages and disadvantages of the DC and AC motors are analyzed so as to develop a 400 motor control system. After experiments, the design is proved to be reasonable, reliable and accurate in terms of picking the unrecognizable notes.
Automatic Localization Algorithm of Multiple Barcodes
Authors: Huang Yin Hua , Zhao Shi Qi
Published: August 2011

Localization of barcode is the key technology for barcode recognition. This paper presents an automatic localization algorithm for multiple barcodes in complex background. The proposed algorithm includes dividing the image into a plurality of tiles, and scanning each of the tiles so as to detect a pattern of strips associated with the barcode in at least one of the tiles. The pattern of strips is analyzed so as to determine the candidate region. Then the effective affine region of barcode is computed by the method of Blob analysis and the barcode is only contained in it. Experimental results indicate that the proposed approach has certain accuracy, the efficiency and robustness.
Handwritten Digit Recognition Based-on Bernoulli Mixtures
Authors: Zhao Zhen Hua , Hao Xiao Hong
Published: August 2011

A method based on Bernoulli mixtures is presented in this paper for the purpose of describing the pattern of probability distribution for each of the data sets of handwritten numerals (0-9), and then classifiers are formed from these. The test samples are recognized by their posterior probabilities conditioned on every classifier. Experimental results show that our method is superior to conventional methods on robustness and accuracy.
Approaches to the Feather Stain Detection and Segmentation
Authors: Ming Jun Feng , Wang Ren Huang , Tang Su Xiang , Liu Hong Jiang
Published: August 2011

Extraction of feather defects is difficult because of their complicated and diversified characteristics. It is proposed that feather stain defects be extracted in HSI color space according to color characters of different types of feather defects. The improved variational level set method is adopted to locate and segment the feather stains on that basis. Experiment results show that the proposed methods can extract feather stains effectively and segment them accurately.
Research on the Transverse Displacement Sensors Using Linear Array CCD
Authors: Li Fu Bao , Li Qin , Li Zhong Ke
Published: August 2011

Linear displacement sensor is a component, which can convert the displacement into electrical signals, and is used to measure the relative motion between components. Because the relationship between output of sensor and stroke power is nonlinear and it may be affected by external factors, the circuit should be compensated and the sensor should be calibrated. In this research, the LED formed light knife in the mechanical slit, lighting on the sensitive CCD array, and the relationship between displacement and CCD photosensitive arrays can be founded. CCD is the discrete components, which has avoided the nonlinear problem. At the same time, because the CCD output is digital, it reduced the measurement time, so that linearity, accuracy, stability, greatly are improved greatly.
The Effects of Solvents to ZnO:Al Transparent Conductive Thin Films Synthesized by Sol-Gel Method
Authors: Tseng Yung Kuan , Chien Shih Chun , Chuang Ming Hung , Hsu Chi Sheng , Chen Yen Cheng
Published: August 2011

The purpose of this study was to discuss the effects of different solvent systems for aluminum doped zinc oxide (AZO) thin film deposition by using the sol-gel method. In the conventional sol-gel method of producing AZO thin films, the solution selected as the precursor solvent was used ethylene glycol monomethylether (EGME), which in this study propylene glycol mono-methyl ether (PGME) was used. The precursor solution was observed by TGA/DSC to understand the variations while heating. The two prepared precursor solutions were then respectively spin coated onto substrates of boron silicate glass. XRD analysis indicated both showed significant c-axis preferred orientation. The surface morphology of the films was observed by FESEM, which showed that the thin film surface by PGME solvent was smoother and dense. A four-point probe was used to measure the electrical resistance of the thin films, which the measured results indicated that the thin film produced by PGME had lower resistivity than those produced by EGME. Resulting with a thin film electric resistance reaching as low as 3.474×10-3(W×cm). The visible light transparency was determined via UV-vis analysis. Results showed that the average transparency of thin films produced by the EGME solvent reached 95% and above, where the average transparency from PGME solvent still reached 90% and above. Experimental results demonstrated that PGME is a good option to synthesize AZO thin films.
Investigation on Sub-Rapid Solidification Behavior of Semi-Solid Magnesium Alloy Metal
Authors: Teng Hai Tao , Xiong Bai Qing , Zhang Yon Gan , Li Ting Ju
Published: August 2011

In order to investigate sub-rapid solidification behavior of semi-solid magnesium alloy metal, a novel semi-solid processing technique, called new vacuum suction casting (NVSC), is used to manufacture thin castings of AZ91D Mg-alloy directly from a liquid metal. The resulting microstructures of castings are characterized in detail and linked to the solidification behavior. In the microstructure of the sub-rapidly solidified SSM sheet, the “preexisting” primary solid particles, with the morphology of near-globules or rosettes, disperse in the homogeneous matrix consisting of fine near-equiaxed secondary α-Mg grains and fine precipitates of β-Mg17Al12 intermetallics. Owing to rapid solidification rate, the volume fraction of the β phase in the sub-rapidly solidified SSM sheets is much lower than that in the as-cast ingot. In addition, the content of alloying elements of Al and Zn was higher in the grain boundaries and the eutectic structure than that in the primary solid particles and in the second α-grains.
Application of MATLAB Image Processing Technique in Experiments of Surfactant Drop Spreading
Authors: Ye Xue Min , Ma Shao Dong , Li Chun Xi , Wang Huan
Published: August 2011

The present paper used MATLAB digital image processing technology to solve the spreading images occurred by surfactant drop spreading on a liquid film, which to obtain the spreading area very well. Based on analysis of spreading index, it is indicated that the results obtained by present paper is basically agreement with those gained by other researchers, which shows that the method of digital image processing is able to meet the requirements of experiment image analyzing entirely.
The Optimization of Gate Design of Side-Axis Part in Air Switch
Authors: Wang Qian , Xu Zi Ming
Published: August 2011

Gate location and number setting are the key technology in injection molding. Flow direction and balanced flow of polymer depend on gate location and number whose optimization can promote product quality. Gate location and number of air switch side-axis were analyzed in injection flowing process with CAE software Moldflow. According the simulation results, the best gate location and number were set up. The study result is preparations for further injection system design and it provides evidence for mold optimization design. By utilizing the simulation results, the product quality is improved and the designing cycle is shortened.
Numerical Simulation on Heat Transfer from Envelope of the Underground Engineering
Authors: Wang Li Jun , Miao Xiao Ping , Wang Rui Hai , Wang Bo
Published: August 2011

Whether the results of the dynamic heat flux from the underground engineering envelope are accurate, may influence the accuracy of calculating the transient heat load and could affect the initial cost and actual operation of the air conditioning system in the underground engineering. Based on the mathematical modeling of heat transfer in the underground engineering envelope, the influence of the model dimension, boundary condition on the soil surface, initial temperature of the soil, the adiabatic distances far from the envelope and the heat transfer coefficient between the envelope surface and the indoor air, the heat transfer mechanism of the underground engineering envelope was studied in terms of the building structure, style of the envelopes and the difference of the locations. For providing the analysis basis to simplified calculation of heat transfer in the underground engineering envelope.
Aging Hardening of γ1-Ti4Nb3Al9 Phase in Ti-48Al-10Nb Alloy
Authors: Su Guang Cai , Huang Jia Ying , Qin Long Fei , Liu Hong Wei
Published: August 2011

A Detailed Transmission Electron Microscopy (TEM) Study Has Been Made of the Ageing Hardening Behavior of the γ1-Ti4Nb3Al9Precipitation Phase in the γ-TiAl Matrix in Ti-Al-Nb System. it Is Revealed that the γ1-Ti4Nb3Al9Precipitate, which Is Formed by a Normal Quench at 1473k and Ageing Treatment at 1073K, Takes Needle-Like Morphology with a Growing Axis Parallel to [001] Direction of the Matrix. the Needle-Like Precipitates Act as Barrier Grid to Inhibit Dislocation Moving on the Slipping Plane {111} of the γ-TiAl Matrix, which Helps to Improve the Strength of the Alloy. the Effects of the Third Element Niobium to the Strengthen of High Nb Containing TiAl Alloys Lie in Not only Solid Solution, but Also Ageing Hardening. the Interfaces between Precipitate and Matrix Are Also Investigated.
A Study on the Relation between Die Roll Height and Die Chamfer Shape in Fine Blanking for Special Gear
Authors: Kim Jong Deok , Kim Heung Kyu , Heo Young Moo , Chang Sung Ho
Published: August 2011

In this paper, the relation between die roll height and die chamfer shape was studied by fine blanking experiments for imaginary special gear. The three die inserts with different die chamfer shapes were machined, and fine blanking tool was manufactured. Using the fine blanking tool, three experiments were conducted on the 650 ton fine blanking press. Each die roll height was measured, analyzed and we found the tendency of die roll heights on imaginary special gear to increase with increasing die chamfer angle, with the horizontal distance of die chamfer being constant. This result can be used to minimize the die roll height of fine blanking gear parts when designing die chamfer of fine blanking tool.
The Error Compensation Strategy of 3-TPT Parallel Machine Tool Based on Semi-Closed Loop Control
Authors: Guo Jian Ye , Sheng Zhong Qi , Zhao Liang
Published: August 2011

This paper took a kind of 3-TPT Parallel Machine Tool (PMT) as the object of research; it mainly introduced the process of establishing the compensation strategy for this PMT. Firstly the kinematics equation of this PMT was established on the basis of kinematics analysis, the results showed that the kinematics equation of this PMT have characteristics that are simple calculation, explicit expression and unique solution. Then according to the structural characteristics and the results of kinematics analysis, the error compensation strategy of feedback correction type with the semi-closed loop control mode was used in the error compensation for this PMT by the method of assembling the gratings on the driving rods, namely the compensation way of “parallel driving and parallel feedback” was adopted. The research results in this paper provided a theoretical basis for realizing error compensation of this PMT, and had important practical significance for improving machining precision of PMT.