bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of Orientation of Reinforcements on the Quality of the Machined Surface in Machining Aluminium Composites
Authors: Wang Da Zhen , Feng Pei Feng
Published: September 2013

The precision turning experiments of aluminium composites reinforced with SiC whisker reinforcements were done by polycrystalloid diamond (PCD) tools. The measure analysis of the machined surface was carried out with Atom Force Microscope (AFM) and Scan Electronic Microscope (SEM). The roughness values of the machined surface were measured by Talysurf-6. The results show that the orientation of reinforcements in the machined surface will directly affect the deformation mechanism of SiC whiskers, microstructures of the machined surface, and to determine the quality of the machined surface. In the five types from A to E of SiC whisker orientation, the orientation of case A easily makes to produce SiC whisker deformation by cutting off directly, and to result in the best machined surface. However, for the orientation of case E, it easily makes to induce SiC whisker deformation by pulling out or pressing into aluminium matrix, and to produce the worst machined surface.
Magnetic Field Interaction of Tiny Grinding Wheel Cluster Based on Magnetorheological Effect
Authors: Chai Jing Fu , Zou Qiong , Song Wen Qing
Published: September 2013

The tiny grinding wheel cluster based on MR effect is an ultra-precision machining tool. The structural optimization and magnetic pole characteristics of machining tool are studied in order to improve its machining performance. In this paper, the Maxwell3D of finite element analysis software is used to simulate and analyze the magnetic field interaction of tiny grinding wheel cluster based on MR effect. A polishing experiment is done, and the results show that the polishing effect in the same polarity is better than that in the opposite polarity.
Study on Dimension Change Law from CAD Model to Prototype of Rapid Investment Casting Based on Selective Laser Sintering
Authors: Lu Gang , Xu Shuai , Yan Qing Song , Xiong Xu , Yu Huan
Published: September 2013

Rapid Investment Casting can overcome the cost involved in designing and fabrication of metal tooling for wax injection process. The present investigation is aimed to determine the effects of CAD model placement degree and size on the dimension error of prototype base on Selective Laser Sintering. The experimental results show that the dimension change law of length, width and height is different from each other, it mainly due to the intersection angle between important edge and forming plane. When the angle is 0° and 90°, staircase effect is smaller and dimension accuracy is higher, when the angle is 45°, the staircase effect is biggest and dimension accuracy is lowest. The CAD model size has significantly influence on dimension accuracy because of secondary sintering, when the model size is 86mm, the secondary sintering reduces to minimum, the dimension error is 0, the secondary sintering is more obvious with the decrease of CAD model dimension.
Study on Undercut Characteristics of Die Steel in Spray Etching
Authors: Song Qing , Yu Zhao Qin , Guo Zhong Ning , Wang Guan , Huang Hong Guang
Published: September 2013

The NAK80 die steel was processed in spray etching with mask preprocessing.The effect of the mask gap width and etching depth on the undercut ratio was investigated . The result shows that with the increase of the mask gap width the effect of the etching depth on the undercut ratio increases. Based on the experiment, the relation of the mask gap width, the etching depth and the undercut ratio is obtained.
Improvement of Surface Properties of Magnetic Shaft Material Inconel718 by HVOF Spray Coating of WC-CrCNi Powder
Authors: Cho T.Y. , Joo Youn Kon , Yoon Jae Hong , Fang Wei , Zhang Shi Hong , Chun Hui Gon
Published: September 2013

Micron-sized WC-CrCNi powder (WC-metal powder, WC 68%, C 0.56%, Cr 21% Ni 6%) was coated onto magnetic shaft material Inconel718 (In718) surface using HVOF thermal spraying equipment for the improvement of the surface properties of the shaft. During the HVOF coating, metal carbides, such as WC and Cr7C3 decomposed to W2C, metals and free carbon. The free carbon and the excesively sprayed oxygen formed carbon oxide gases and thus produced pores and voids in coating. The optimal coating process (OCP) that produced the lowest coating surface porosity and the highest surface hardness was determined by the Taguchi experimental program of nine processes for four spray parameters with three levels. Coatings with porosity 1.20±0.1% and hardness 1150±60 Hv were prepared using optimal coating processes. The coating was porous, but the hardness was improved approximately three times from 400±10 Hv (In718) to 1150±60 Hv (coating). Friction coefficients (FC) of the coating were lower compared with In718 at both 25°C and 450°C. FC decreased with increasing temperature from 25°C to 450°C for both In718 and the coating. Wear depths of coatings were smaller than those of In718 at both 25°C and 450°C. For the improvement of the surface properties and durability of the magnetic shaft, HVOF WC-CrCNi power coating was recommended.
Strengthen Experimental Study of High Strength Steel 40CrNi2Si2MoVA Based on Laser Shock Processing
Authors: Wu Yong Hua
Published: September 2013

40CrNi2Si2MoVA high-strength steel is widely used in aircraft industry because of its unique combination of ultrahigh strength with high fracture toughness. However, 40CrNi2Si2MoVA is vulnerable to both corrosion fatigue and stress corrosion cracking failures with catastrophic consequences for aircraft. The high strength steel 40CrNi2Si2MoVA is enhanced and strengthen by usage of laser shock processing (LSP) with a optimal shock processing parameters, and after a series of comparion experiment in different overlap rate,the surface compressive residual stress in the testing specimen is measured and compared, and the experiment results show that the specimen surface has-962MPa compressive residual stress. Finally, the enhanced effect of compressive residual stress in surface of specimen by laser shock is discussed. The results of laser shock processing has a guiding significance to the engineering applications of high strength steel.
Influence of Rare Earth on Hot-Dipped 55%Al-Zn Alloy Coating
Authors: Guo Tai Xiong , Dong Xue Qiang , Deng Shu Hui , Li Feng , Zhou Yi Lin
Published: September 2013

Simulation experiment was done to investigate the effects of rare earth on hot-dipped Zn-55%Al alloy coating. The results show that the rare earth has little effect on the zinc dross and its burning loss is about 10%. The microstructure of coating is similar to that of solidification bath, and which is made up of phases of rich aluminum, rich zinc, rich silicon and rare earth, and intermetallic layer of Al-Zn-Fe-Si. The rare earth phase is needle or rod, and mainly distributed inside rich zinc phase and on the interface between the coating and steel substrate. The rare earth has no obvious influence on coating grain and spangle size. The appropriate addition of rare earth would be helpful to improve the coating bending formability and corrosion resistance.
Evolution Regularity of Temperature Filed in Hot Power Backward Spinning for 7075 Cast Aluminium Alloy Tube
Authors: Zhang R.Y. , Tu S.J. , Zhao G.Y. , Wang J. , Guo Z.H.
Published: September 2013

The spinning temperature is one of key factors affected the uneven deformation during the hot power backward spinning for brittle material tubes, such as cast 7075 aluminium alloy tube. To analyze the evolution regularity of temperature filed in the spinning process, a 3D thermo-mechanical FE model of the process is developed under ABAQUS/Explicit environment. Then, the evolution of temperature filed during the process is analyzed based on the FE model. The results show that: The contact areas temperatures between lock ring, spinning rollers and tube decrease sharply during the initial spinning stage. The high temperature region is transferred from unformed zone of the tube to the contact area between spinning roller and tube. In the spinning zone, the temperature of internal surface of the tube is apparently higher than that of outer face.
Off-Line Feed Rate Scheduling Based on a Mechanistic Cutting Force on Discrete Segments during End Milling
Authors: Islam M. N. , Pramanik A. , Basak A. K.
Published: September 2013

This paper describes the development of an off-line feed rate scheduling technique based on a mechanistic cutting force model. The proposed technique was developed for an end milling operation. The surface area of the workpiece was divided into a number of segments, and the resultant cutting force at each discrete segment was determined using One Path Analysis software. The calculated resultant cutting force was applied to the feed rate scheduling. Experimental results clearly showed that the implementation of feed rate scheduling reduces machining time considerably and that as the number of segments increases, the effectiveness of the feed rate scheduling increases.
Decarburization Depth Control Technology Research and Application for U71Mn Rail
Authors: Deng Shu Hui , Deng Yong
Published: September 2013

U71Mn is the main steel grade for high-speed railway rails. In the production of U71Mn rail, its decarburization depth is the deepest, and the qualified percentage is lower than 60% for the requirement of less than 0.3mm of decarburization depth. On the basis of current heating furnace, the influence of different heating processes on the decarburization depth of U71Mn rail was studied, and the result shows that just optimization of heat process can not decrease greatly the decarburization depth. Therefore the high temperature anti-oxidation coating protection technology was carried out in the process of heating of U71Mn rail. Under the condition of protection heating and optimization of heating process, the decarburization depth of U71Mn rail decreases significantly, and the qualified rate reaches to more than 95% for the depth of less than 0.30mm, and 100% for the depth of less than 0.50mm.
Study on the Shape Distortion of Sheet Inner-Concave Flanging
Authors: Zhang Ling Yun , Sun Ze
Published: September 2013

In this paper, through analysed the strain and stress of sheet inner-concave flanging and observed result of finite element simulation, the law of strain distribution in outer edge area of deformation.By simplified the distributed regularity, a method to predict the shape distortion of outer edge area of deformation was obtained, the calculation results and the finite element simulation results are nearly equal to each other.
Study of the Effect of Hot Gas on Atomization Quality of Spray Forming
Authors: Yang Qing , Qu Ying Dong , Su Rui Ming , Zheng Bing Kun , Wu Yu Sheng
Published: September 2013

In the spray forming process, the atomizing quality is not very good under the low pressure. This article attempts to improve the quality of atomization through heating the gas. A mathematical model is built and calculated according to the existing knowledge, and then the influence of airflow temperature in the spray forming is theoretical calculated and analyzed. The experimental results show that the average grain size is 54μm when the gas is not heated; the average grain size is 39 μm which decreases by 27.7% than airflow unheated when the gas is heated to 150 °C. The calculation results show that when the gas is not heated, the first time atomization grain size is 201 μm, the second time atomization grain size is 15 μm, the total atomization time is 92 μs. And the velocity of atomization droplets is 80 m/s; when the airflow temperature is 150°C, the above results are 131 μm, 10 μm, 76 μs and 127 m/s respectively, the atomization quality has a certain improvement compared to the unheated condition. At the same time, the grain shape becomes more round as the temperature of airflow increases, and the holes between the grains also become smaller.
SRSM-Based Stochastic Model Updating Method
Authors: Rui Qiang , Wang Hong Yan
Published: September 2013

With the combination of stochastic response surface model (SRSM) and Monte Carlo simulation (MCS)-based inverse error propagation method, a computational efficiency stochastic model updating approach has been proposed. The SRSM of original finite element model is determined using the Hermite polynomial chaos expansion and regression-based efficient collocation method. The efficiency of this method is demonstrated as a large number of computational demanding full model simulations are no longer essential, and instead, the updating of parameter mean values and variances is implemented on explicit SRSM. The effectiveness of this approach is validated through a bolt-jointed double-hat structure numerical example. The proposed method can be applied on stochastic uncertainty quantification of complex engineering structures.
Experimental Analysis of Hardness Distribution of the Transition Region in Tailored Tempering Stamping of Ultra-High Strength Steel
Authors: Xu Ya , Wang Zi Jian , Zhang Yi Sheng
Published: September 2013

With hot forming parts of ultra-high strength steel (UHSS) widely used, requirements on matching the mechanical properties of parts with the performance on active service are attracting attention. Research shows that the preheat temperature of the molds set to 400°C or above can effectively reduce the hardness of the sheet and get a better region. The width of the air gap between tools is important influencing factor. Too large air gap will increase the difficulty of controlling the region of variable intensity and the position of ultimate strength.
Study on Processing Parameters of Supersonic Particles Bombarding Treatment
Authors: Liu Yu Liang , Xiong Tian Ying
Published: September 2013

Supersonic Particles Bombarding (SSPB) can introduce severe plastic deformation on the surface of metallic materials, and nanostructured surface layer can be fabricated on the materails. So SSPB is a promosing technology which can be applied in industry. Main parameters of SSPB were optimized by orthogonal design, and their effect on the weight loss of the SSPB treated sample was analysed. Optimized parameters were obtained after the orthogonal experiments.
Effects of Ceramic Particle Reinforcement Distribution on the Penetration of FGM Armor
Authors: Wang Zhen Qing , Tang Xiao Jun , Wang Xin Tao , Meng Xiang Nan , Lv Hong Qing
Published: September 2013

In this paper, ANSYS/LSDYNA software is used to simulate the process of armor-piercing projectile vertical penetrate metal matrix functionally graded material (FGM) armor reinforced by ceramic particles with the distribution of two power-law function along the thickness direction. The ceramic particle volume fraction varies from layer to layer along the armor thickness while ceramic particles total volume fraction remains unchanged. Four different ceramic particles distribution armors with the same total volume fraction are simulated. And the effects of the two power-law function types on the penetration of functionally graded material armor are investigated. The results show that the ballistic resistance of ceramic particle reinforced functionally graded armors is better than homogeneous ceramic particle reinforced armor with the same total volume fraction. Meanwhile, the larger the ceramic particles volume fraction on target surface is, the better ballistic resistance of functionally graded armors will be.
Experimental Study on the Influence Factors of Static Aerodynamic Characteristics of Ice-Coated Commonly Used Conductors
Authors: Huang Han Jie , Li Xin Min
Published: September 2013

For conductors commonly used in the high and ultra-high voltage transmission projects, research was conducted on how ice shape, ice thickness, wind speed and angle of attack affect the static aerodynamic characteristics of ice-coated conductor. The ice shape and the shape of ice-coated conductor are both important factors that determine the aerodynamic characteristics of conductor. Sudden increase of lift coefficient may happen at low angle of attack. Wind speed shows less effect on aerodynamic characteristics of ice-coated conductor with streamlined shape than that of conductor with blunt shape. Under most attack angles, aerodynamic coefficients increase as the ice thickness increases. The aerodynamic load on ice-coated conductor does not increase linearly with the diameter of conductor.
A Method of Evaluating Carton Black's Morphology Based on Convex Hull
Authors: Wang Xiao Bo , Wang Chuan Sheng
Published: September 2013

Given the influence of carton black's morphology on rubber's property, A new method was supplied that the parameters, such as length diameter ratio, morphology complexity, were used to characterize carton black's morphology. Convex hull of carton black’s region was used to calculate morphology complexity. Minimum bounding rectangle of carton black’s region based on convex hull was used to calculate length diameter ratio. The quantitative evaluation of carton black’s morphology is meaningful for researching the relationship between carton black’s morphology and rubber’s property.
The Manufacture of Spherical WC Powder in Plasma
Authors: Huang Wei , Chen Zi Ming , Liu Yong , Shang Fu Jun , Su Ji Hong , Tian Xiao Yan
Published: September 2013

The manufacture technology of spherical WC powder has been studied by using of induction plasma. We can get spherical powder above 85% in the powder through changing several parameters. And the hall flow-ability, the oxygen content , particle size of powder before and after plasma treatment have been compared. The results were shown that oxygen contents was deduced markedly, and the plasma method can control the particle size easily.
A Study into the Influence of Material Characteristics on Book Binding Design
Authors: Xu Yun Hao
Published: September 2013

The paper studies the application of different material sense qualities in book binding design through case study. It further proposes that binding material functions as a powerful language in book binding design, and the variety of binding materials produces a richer variety of book binding design such as diversified forms, contents and binding technologies, thus putting higher standards on modern book binding design.
Kinematic Analysis of the Slider-Crank Type Cluster well Pumping Unit (SCTCWPU) Based on Pro/Mechanism
Authors: Sun Wen , Ren Tao , Qu Wen Tao , Wang San Min
Published: September 2013

Centric slider-crank mechanism forms the main mechanism of slider-crank type cluster well pumping unit (SCTCWPU). The kinematic analysis is the basis of structure design of SCTCWPU. The kinematic analysis based on Pro/Mechanism is simple, intuitive ,reliable,accurate and easy to be modify. This paper presents the mechanism kinematics simulation of SCTCWPU based on Pro/Mechanism. In addition,a comparative motion analysis of SCTCWPU in Pro/Mechanism and MATLAB is made on the basis of actual working conditions.
Optimized Analysis of Orthogonal Experiment of Continuous Casting Powder Components Based on Matlab
Authors: Han Xiu Li , Liu Lei , Chen Wen , Wang Jin Hua
Published: September 2013

The optimal design of mineral composition of mould powder is significant for the improvement of quality of slab. This paper applies Matlab computing platform into mould powder proportioning scheme; designs multi-factor and multilevel orthogonal experiment based on CaO-SiO2-Al2O3mould powder system; prepares mould powder with the same content change of proportioning components and measures the melting temperature and viscosity of each mould powder; and establishes the regression relationship between viscosity and chemical components of mould powder by using Matlab to provide multiple pure quadratic regression analysis function of tool kit; analyzes the dynamic relationship between the viscosity of slag system and the content of various chemical components and provides quantitative analysis method for the optimal design of mould powder.
Study on Properties of Extraction Palladium(II) with the New Synthesized Material
Authors: Feng Shao Ping , Huang Zhao Long , Liu Wei , Li Zi Jing , Jiang Yan , Xiao Rui Min
Published: September 2013

In this study, the solvent extraction of Pd(II) from hydrochloric acid solutions was investigated using the new synthesized material, 2-ethylhexyl benzothiazolyl sulfide (EHBTS) which was dissolved in xylene. Pd(II) was strongly extracted by 7% EHBTS in a lower concentration hydrochloric acid solution. Extraction parameters of Pd(II), including EHBTS concentration in different diluents, contact time of aqueous and organic phases, organic/aqueous (O/A) phase ratio and HCl concentration of aqueous phase, were studied. Quantitative extraction of Pd(II) occurred at 0.1 mol.L-1 of HCl concentration, 7% of EHBTS concentration, 1.0 of O/A, 40 min of contact time. In addition，the percentage stripping of Pd(II) could be more than 98% when thiourea concentration was 0.8 mol.L-1. EHBTS can be used more than 8 as extractant to extract of Pd(II) from hydrochloric acid solutions.
Design of Cigarette Universal Code Printing System
Authors: Shuai Xiao Ying , Huan Xiao , Hu Jun , Jiang Bao Li
Published: September 2013

Aim at the fact of cigarette code printing system, designed an automatic code printing system for profiled cigarette and standard cigarette. We optimized system performance through the model of communication protocol with UML. The new scheme can improve the current system capability, save cost and improve the efficiency.
Fatigue Strength Check of Flexspline with Inner and Outer Gear Ring of the Micro Harmonic Drive
Authors: Mo Han Ning , Xin Hong Bing , Cui Deng Qi , Wang Wen Jing , Gao Jian Cheng , Liu Long , Wang Tan , Xin Yue Fei
Published: September 2013

The fatigue strength check of the flexspline is the premise and basis of the design of harmonic drive. Fatigue strength of the flexspline with inner and outer gear ring of micro harmonic drive are checked.Through the check calculation and finite element analysis, fatigue strength of inner and outer gear ring can meet the strength requirements.
Autonomous Navigation System Based on GPS for Agricultural Vehicles
Authors: Zhou Jian Jun , Wang Xiu , Wang Xiao Fang , Liu Gang , Li Su
Published: September 2013

The development of a fuzzy navigation controller for wheeltype agricultural vehicles with mechanism steering system was presented. The fuzzy controller was designed based on heading angle error and cross track error. The incremental PID control method was used for front wheels turning control. Simulation was done based on two wheels vehicle model. Automatic navigation control system was also developed,which was made up of the upper computer and the lower controller part. The upper computer was a flat industrial computer, and the lower controller was developed by ARM7. The experiments were done in the Xiaotangshan National Demonstration Base for Precision Agriculture. The cross track error of line track using this system was less than 0.12m, and the average cross track error was 0.04m.
Analysis and Research on Construction Technology of Air Return Inclined Shaft Crossing Formation on Special Conditions
Authors: Kong Jie , Hou Li Jun , Sun Chang Qing , Xu Zhe , Zhao Li Zhi
Published: September 2013

The sectional area of air return inclined shaft 1 in Hecaogou coal mine is 20.7m2 and the dip angle is 20°. It belongs to the large angle and section inclined shaft. The soil of mining area has the characteristics of loose, poor stability and integrity, low compressive strength, easy to be in the rheological and pulverization. After the first support in hidden digging section of air return inclined shaft 1, the soft and collapsible loess strata turned into the shape of silly putty because of the construction disturbance, which caused serious deformation and subsidence to that shaft. We succeed to pass the extra thick soft and collapsible loess strata and obtain the expected effect the by means of analyzing deformation principle of surrounding rock on shaft and grouting reinforcement of rail pile and advanced support of exploration of thread steel and metal wedge and comprehensive technology of using stone to take the place of the floor loess. It has reference significance to the other shaft and drift construction with the similar formation condition
Efficient Method for Tool Path Generation Based on Region Intersection for Complex Mesh Surface Machining
Authors: Chen Xiao Bing , Yu Kun
Published: September 2013

The machining efficiency of conventional section plane method is low for complex mesh surface machining. An efficient method for tool path generation based on region intersection is proposed. The mesh surface is first divided into a series of intersection regions, then vertex curvatures in perpendicular directions of tool paths are estimated by local fitting method, and variable tool path intervals are computed according to the curvatures, scallop height and cutter radius, finally redundant cutter location points are removed according to machining precision. Experiment results indicate that tool paths generated by proposed method are avail to promote machining efficiency of complex mesh surface machining.
The Optimization of Production and Drainage of CMB for Multi-Branch Horizontal Well
Authors: An Lei , Cai Zhenhua , Si Na , Yuan Yu Jin
Published: September 2013

The unconventional gas is the most available alternative fossil resource in China and coal bed methane is big part of it. The main characteristics of coal reservoirs are low permeability, thin formation and strong stress sensitivity. The multi-branch horizontal well is emerging technique for developing CMB and applied successfully in FanZhuang block etc. But a lot of problems need to be solved during production and drainage. Such as coal bed can easily collapse when formation pressure fall fast and strong sensitivity leads cheats system closing. In this paper the operation of CBM wells is discussed and optimized project of production drainage is presented to maximum the productivity of multi-branch horizontal well.
Information Fusion of the Vibration and Acoustic Signals Based Rolling Bearing Incipient Fault Diagnosis Method
Authors: Ming Ting Feng , Zhang Yong Xiang , Li Jing
Published: September 2013

The feature of correlation analysis were described and applied to analyzing the vibration signal of the gearbox. Aiming to that the diagnosis effect of the rolling bearings incipient fault was not good through the vibration spectrum and the resonance demodulation spectrum directly, the information fusion technology based on the correlation analysis is proposed to processing the vibration and acoustic resonance demodulation signal. The experimental results show that the presented correlation fusion analysis technology can be as the basis of the effective fault diagnosis method for the rolling bearings incipient defect.
Novel MEMS Switch Topology and Nanosensor Package for Multi-Analyte Chemical Detection
Authors: Gupta Anurag , Kim Bruce , Kasim Rahim
Published: September 2013

In this work, we present the development of MEMS switch array and ZnO nanowire-based sensor technology to detect multiple analytes in a sensitive manner. A novel approach that incorporates the advantages of MEMS technology with highly sensitive ZnO nanowire sensor technology has been described. We demonstrate the fabrication of MEMS switch arrays and ZnO nanowire sensing chip that has been appropriately developed. Our integrated approach is believed to enhance the sensitivity of the entire sensor system in addition to increasing the capability of the system to detect multiple analytes with high degree of selectivity.
Research of LED Chips Positioning System
Authors: Xiao Wu
Published: September 2013

LED chips positioning is a key process in chip quality classification. With the use of pattern-matching mechanism, we proposed a new method for high accuracy positioning system which can be used in detection, sorting and crystal binding machines. Firstly, we used the Otsu and morphological filtering algorithms to gather all kinds of LED chips image. The boundary characteristic points of image were then obtained to bring the feature vector to generate a pattern template. Similar characteristic points were then searched in the sample images to achieve accurate chip positioning. Finally, the Euclidean distance error between the template and target feature vector was compared. As the pattern template is only dependent on the boundaries and independent of the grayscale, the positioning robustness and accuracy can be drastically improved, achieving a positioning error of less than 1 μm and a positioning speed of over 574 grains/second.
Finite Element Analysis for Critical Components of Ultra-Precision Grinding Machine Tool
Authors: Yang Lin , Yang Shu Ming , Jiang Zhuang De , Xu Yu Kun , Liu Shi Long
Published: September 2013

The ensemble static stiffness of machine tool is its ability to maintain smooth working condition and resist a variety of loads. As the dispensable part of ensemble static stiffness, critical components stiffness plays a significant role in the performance of the ultra-precision grinding machine tool. In this paper, a three-axis CNC grinding machine tool for the ultra-precision mirror surface grinding of advanced materials such as ceramics and other hard and brittle materials has been designed. And the stiffness and modal parameters of the grinding machine tool are discussed using finite element software. The results are presented and discussed thoroughly. This in turn can help to revise design defects and reduce research and develop costs.
A Novel Image Fusion Based on Nonsubsampled Contourlet Transform
Authors: Sun Xiu Ming , Wang Zhi Min , Geng Peng
Published: September 2013

The nonsubsampled contourlet transform (NSCT) is not only with multi-scale and localization, but also with multi-direction, anisotropy and shift-invariance. A novel image fusion algorithm based on the NSCT is proposed in this paper, aiming at solving the fusion problem of images. Experimental results demonstrate that the proposed algorithm cannot only extract more important visual information from source images, but also effectively avoid the introduction of artificial information. It outperforms the traditional discrete wavelet transform-based and the Contourlet-based image fusion methods in terms of both visual performance and objective evaluation.
Software System Development of Crane Structural Health Monitoring
Authors: Huang Guojian , Wang Dong Hui , Wang Xin Hua , He Zhen Yu
Published: September 2013

In order to improve the level of safety technology and safeguard work efficiency, software is developed. The software is divided into several functional modules: User information Management Module, System Settings Module, Information Collection and Transmission Module, Database Management Module, Data Analysis Module, Site Display Module and User Help Module. This paper focuses on the development and application of the system software. Sensors data is collecting by a FBG System, and directly send into Crane Structure Health Monitoring and Security Alarm Expert System via data filtering and data correction procedures. Users can access the expert systems data network and expert system can send warning or alarm information to user via Wi-Fi. Its the main part of the software platform. After software functional use cases,the next thing to do is the dynamic behavior of software modeling. The dynamic behavior is related to information exchange between users and software, software and peripherals.
A Construction of Fault Test Constraint Based on the Optimal Fusion Set of Multiple Slices
Authors: Zhang Yi , Wang Gang , Lin Ping Rong
Published: September 2013

The standard program slicing of different slices is put into the fusion matrix of the optimal fusion to measure the consistent fusion of slices. In the biopsy of the actual fusion process, the slicing techniques with high consistent fusion and balanced fusion distribution are used to reasonably allocate each weight coefficient, and thus the final fusion estimation formula is obtained. We use slice fusion, path conditions, as well as the internal mechanism of software fault trigger and propagation, to construct the test constraint of a fault. It can help to direct high quality test case design and to evaluate the applicability of the adaptive random testing.
Measurement of Cobalt Gradient in Functionally Graded WC-Co Composites
Authors: Yuan Yi Gao , Wang Yan Kun , Ding Jian Jun , Sun Wei Quan , Zhang Xiao Xiao , Bai Jia Sheng
Published: September 2013

Functionally graded WC-Co (FG WC-Co) offers superior combination of wear resistance, fracture toughness, and strength, and provides superior engineering performance over conventional homogeneous WC-Co. The cobalt gradient structure of the FG WC-Co, including the thickness of the gradient zone and the cobalt concentration distribution, have the great influence on its engineering performances. Measurement of cobalt gradient of the FG WC-Co was studied in this paper using an energy dispersive spectroscopy (EDS) technique. The result shows that the rectangular area scanning mode of EDS is suitable for evaluating the cobalt content distribution quantitatively in the FG WC-Co. Based on the cobalt content distribution curve, the thickness and the amplitude of cobalt gradient in the FG WC-Co can be measured easily.
An New Image Feature Based on ROLD
Authors: Hu Kai , Chen Wei Feng , Mao Dan , Zheng Zi Chen , Duan Jing Yi
Published: September 2013

To make robot more intelligence, this paper proposed a new image feature named as ROLD-map which based on Rank-Ordered Logarithmic Difference (ROLD), and this feature enable researchers understand images complication directly and accuracy. Experimental data show that it can recognize the sky, tree and road obviously with very little time through proposed feature. It provides the fundamental analysis for improving the precision of image recognition, and also gives the reference research for improving the precision of image recognition for the process of visual navigation of robot.
Handwritten Character Recognition Based on a Multiple Fermat's Spiral
Authors: Boudjella Aissa , Samir Brahim Belhouari , Khalil Omar Kassem
Published: September 2013

This paper describes a new feature extraction method which can be used very effectively in combination with Cluster K-Nearest Neighbor (CKNN) and KNN Classifier for image recognition. We propose handwritten English character recognition using Fermat's spiral approach to convert an image space into a parameter space. The system is implemented and simulated in MATLAB, and its performance is tested on real alphabet handwriting image. Fifteen (15) alphabet classes were created to carry out the experiment. Each class contains 9 alphabets {a, b, c, d, e, f, g, h, i}. The total of 15x9=135 alphabet images are captured under fixed camera position and controlled energy light intensity. The experimental results give a better recognition rate, 76.19% for KNN and 95.16% for C-KNN with reducing the overall data size of the transformed image. The relationship between the accuracy and k is investigated. It seems that when k goes from 1 to 9, the accuracy decreases linearly. The result of this investigation is a high performance character recognition system with significantly improved recognition rates and real-time.
Energy-Balanced Routing Method for Wireless Cooperative Wireless Network
Authors: Yao Yan Xin , Liu Qiu Shi
Published: September 2013

This paper presents a new method for optimizing energy consumption of wireless network. This new method tries to keep the energy consumption of the whole network while balancing the energy consumption of each node. In particular, we focus on the routing method to shorten the transmission path for reducing the energy path loss. We perform this by introducing an appropriate fitness function with the Genetic Algorithm. This fitness function is designed in a dedicate way so that the energy consumption minimization and energy consumption balance between nodes could be fulfilled simultaneously. Simulations validate that the proposed method could keep energy consumption and balance the energy consumption simultaneously to a better extent.
Carrier Modulation Technology Based on Orthogonal Frequency Division Multiplexing
Authors: Li Chen Wu , Zhang Jian , Xie Qin , Zhang Xiao Hong
Published: September 2013

This paper first analyzes the transmission characteristics of low-voltage power line channels with the focus on the study of carrier modulation technology regarding the power line communication part, then proposes the orthogonal frequency division multiplexing technology that serves for the digital communication of family network power line communication gateways, analyzes the OFDM system principle, actulizes OFDM modulation and demodulation through discrete Fourier transform (DFT) and inverse discrete Fourier transform (IDFT), and build the OFDM simulation model. Finally, a specific plan of using power lines as the family network transmission media is proposed.
Design and Optimization of Magnetic Levitation Actuators for Active Vibration Isolation System
Authors: Wu Qian Qian , Liu Rong Qiang , Yue Hong Hao , Deng Zong Quan , Guo Hong Wei
Published: September 2013

Actuator based on Lorentz force exhibits excellent isolating performance with its non-contact characteristic, especially during frequency bandwidth below 5Hz. In this paper, mathematical model of the magnetic levitation actuator is constructed. In order to obtain better performance, parametric design of the structure of magnetic actuator is carried out and a multi-objective optimization method is proposed to maximize Lorentz force and minimize the mass of coil on the basis of genetic algorithm in the optimization process. A designing optimization program is developed, by which optimized parameters of magnetic actuator with maximal actuator force and minimal mass of coil can be identified to conduct experiment on ground. Compared with initial values in an instance, the optimized method is proven to be feasible and has the value of practical application.
Application of Numerical Analysis in Improved Threshold De-Noising Method of SEMG
Authors: Yao Lu , Sun Sheng Qi , Li Lin
Published: September 2013

The wavelet threshold de-noising is widely used in the field of signal processing. According to the problems that there are heavy workloads and long time-consuming, when the control coefficient of improved threshold de-noising method is tuned parameter with the traditional optimization method, the numerical analysis is used to parameter optimization, and makes the SNR as a performance indicator to find the optimal control parameter. Experimental results show that the numerical analysis is more quickly than the traditional optimization method to find the optimal parameter and carries out a high-quality signal after de-noising; besides, the dichotomy is less iteration times and more quickly than the golden section method in optimization of control parameters.
Experimental Evaluation of Networked Munitions Communication and Localization
Authors: Cheng Xin Yi , Jiang Chun Lan , Li Ming
Published: September 2013

This paper evaluates the performance of the networked munitions communication and localization. The key requirements of networked munitions are proposed and analyze the possible technologies for localization. The hardware for communication and localization are selected and designed, the software scheme are illuminated according to the hardware and the project. The experiments prove that the design is effective and satisfies the application of networked munitions.
Study on Surface Radiation Noise of a Diesel Engine Based on FEM
Authors: Zhao Ye Miao , Cao Xiao Hui , Guo Chen Hai , Ma Qing Zhen
Published: September 2013

To evaluate the noise of a diesel engine and provide the basis for the next step for noise reduction, a boundary element model of the diesel engine has been built and finite element software is used to analyze the noise of the engine. Surface vibration velocity distribution, radiation noise spectrum, sound pressure distribution and total noise level are calculated. The calculation results obtained show that the most representative three points of the peak of SPL (sound pressure level) are 500Hz, 1200Hz and 1950Hz; total SPL is 108.99dB; the main sources of the noise of the diesel engine are oil pan, gear chamber cover and flywheel housing, these three parts should be prior; the noise of the lower part and left and right part (the gear chamber cover side and flywheel housing side) of the engine is greater than the upper part and front and rear part; improving the suspension mechanism of the internal combustion engine, optimizing the oil sump, flywheel housing and gear chamber cover and strengthening the rigidity of the skirt of the engine body can be used as the primary means of noise reduction.
Software Method for the Signal Processing of Grating Based on SCM
Authors: Han Wei Na , Li Qun Li , Yu Peng
Published: September 2013

For the purpose of improving the interference resistance and accuracy of the grating detection system, a SCM-based software design method for grating signal processing is proposed in the thesis. In the method, two differential signals output from the grating detection circuit are amplified and shaped via the conditioning circuit, converted into digital quantity through AD conversion and processed by the SCM. Relying on the programming, properties of direction discrimination and subdivision are attained while effective computation accuracy of subdivided data and signal processing speed are guaranteed. The software processing method simplifies system hardware circuit, cuts down the cost, improves the resolution and measurement precision of the system due to the stable performance and strong interference resistance. The method is experimentally proved to be practical and worthy of promotion, which can be utilized in machine tool reform and relevant position detection systems.
Structure Design of Stamping Die Based on Topology Optimization and Shape Optimization
Authors: Xu Wu Jiao , Zhang Lei , Li Wu Hua
Published: September 2013

To quantitatively analyze the structural topology and control the elastic deformation of die structure in stamping, a new die structure design method was proposed. The forming analysis was conducted based on the die surface mesh generated in the third-party software. Structural analysis models were established according to the die surface mesh and deformation resistance obtained from forming analysis results. And then, the structure analysis and optimization were carried out. This new method for structure design of stamping die has two advantages. First one is the combination of forming analysis and structure analysis makes the structural optimization procedure more practical. Secondly, the coupling of topology optimization and shape optimization makes it possible to fundamentally change the structural topology and it is a new attempt to mold design.
A User’s Profile Model for Cloud Computing Service
Authors: Ma Wu Bin , Liu Ming Xin , Deng Su , Huang Hong Bin
Published: September 2013

Personalization of model-based cloud computing platform based on specialized user models has become more important in order to preserve the effectiveness of their service as the amount of available content increases. In this paper, a users profile model is imported to the cloud computing. We propose a method of modeling users profile for cloud computing, and establish a simple users profile. At last, we use this model in the Google App Engine for searching some service to prove that importing the users profile model is useful and efficient for cloud computing service.
Supplement of Several Problems in Roller Chain Drive Design
Authors: Lu Pin
Published: September 2013

Some important problems in roller chain drive design are not full explaned in the textbooks and manuals of machine design.The issues such as basic parameters,geometric dimensioning, sprockets part drawings,the design of roller chain drive while low velocity,which are discussed here.
On Relationship of some Cryptographic Properties for Weight Symmetric H Boolean Functions
Authors: Huang Jing Lian , Wang Zhuo , Hu Jie
Published: September 2013

Using the derivative of the Boolean function and the e-derivative defined by ourselves as research tools, we go deep into the internal structure of the Boolean function values,and discuss the relationship of a variety of cryptographic properties of the weight symmetric H Boolean functions in the range of the weight with the existence of H Boolean functions. We get the results of the weight symmetric H Boolean function should have the same algebraic immunity order, correlation immunity order, the degree of diffusion and nonlinearity. The results provide a theoretical basis to reduce nearly half workload for studying the cryptographic properties of H Boolean function, and provides a new research methods for the study of the properties of cryptographic security of Boolean functions.
Research on the Initial Value of the Simulated Annealing
Authors: Liang Xiao Wen , Gong Wei , Fu Wen Long , Qi Jing
Published: September 2013

Simulated Annealing Algorithm is one of the top ten classical optimization algorithm, and it has been successfully applied to various fields. Simulated annealing is a optimization algorithm which can find the global optimal solution, compares to neural network algorithm, it is so easily to implement that has higher probability to be adopted, but it has own shortcomings like other optimization algorithms, its result largely depends on initial value, The initial value of the traditional simulated annealing algorithm began with a random number, its convergence speed is often slow very much and the effect is bad. In this paper, a new simulated annealing algorithm that based on genetic algorithm and hill-climbing method was brought up, because of hill-climbing algorithm was easy to fall into local optimum, and simulated annealing can just solve the problem, it not only escaped from local optimum, but also got good convergence speed and results.
Research of Mobile Learning System for Music Appreciation Class Based on Cloud Computing
Authors: Sun Xiaoliang
Published: September 2013

The application of cloud computing technology provides a new idea to the development of mobile learning. The applications based on cloud computing is focus on the solution of music appreciation class in the paper. The design of mobile learning system for music appreciation class based on cloud computing is proposed and the related concepts of cloud computing is briefly introduced. The topology of the system is given. In the end, it shows deeply mobile learning system class based on cloud computing is the urgency of education development. It can provide the better services of music appreciation class.
Comparison between Normalized Databases Implemented with Different Database Systems
Authors: Khalil Omar Kassem , Boudjella Aissa , Samir Brahim Belhouari
Published: September 2013

This paper compares different levels of database normalization process in terms of anomalies removal and storage reduction. Several databases have been normalized up to Third Normal Form (1NF, 2NF and 3NF) in order to investigate the influence of the normalization on the database performance. They are implemented separately with different database systems such as MS Access, SQL Server and Oracle. The percentage of storage reduction and data anomalies are investigated for every normal form and database system. The results show that the data storage is significantly reduced over unnormalized database, approximately between 20 to 30% for 1NF flattening tables and 1NF decomposing table, and between (15% - 22%) and (9% - 22%) for 2NF and 3NF, respectively. The removal of the majority of anomalies is observed in the first normal form while fewer anomalies are removed in the next higher normal forms. For the same database implemented, the comparison between three different database systems shows approximately the same results with slight differences. These differences may be due to the nature, the size of the constraints and metadata on each database system.