bluuebunny/crossref_metadata_2025 huggingface dataset:
Study of Flexible Blank-Drawer Forming for Sheet Metal
Authors: Li Yuan Ting , Han Qi Gang , Li Ming Zhe , Feng Peng Xiao
Published: October 2011

In order to save the manufacturing cost and solve problems of stamping, a new type of flexible blank-drawer (FBD) forming device was presented by the authors based on the principle of flexible stretch-forming. It can be used with a variety of different sizes, different shapes of stamping die which can cut the manufacturing cost and shorten the development cycle of sheet metal forming largely. Extensive numerical simulations of the process for forming saddle parts were carried out and the forming results using FBD were compared with those using traditional blank-holder (TBH). By adjusting the value of blank-drawer force, good quality of saddle parts can be attained easily. Simulation results indicate that FBD forming can solve the shortages of TBH forming, inhibit wrinkle, prevent fracture, and form parts with small springback and uniform strain. This work can provide useful guidance in plastic forming technology for sheet metal.
Measurement of Hysteresis Loop by Using Pulsed Magnetic Field in LabView Environment
Authors: Huang Dong Yan , Han Bing , Hu Tian Li , Wang Zong Gang , Zhang Tao
Published: October 2011

An apparatus for in situ measuring the hysteresis of magnetic materials by using pulsed magnetic field is structured. The samples were locally magnetized to saturation by the pulsed magnetic field. The pulsed field is generated by the discharge of a capacitor over the magnetizing coil. The measurement has been developed in LabView environment using National Instrument Data Acquisition Cards. The hysteresis loops of Q235 steel samples under various compressive stresses are presented.
Position Sensorless Control of PMSG in Wind Energy Conversion System
Authors: Jia Gui Xi , Zhao Hui Chao , Wang Chang Xiang
Published: October 2011

This paper presents a position sensorless operating method in WECS (Wind Energy Conversion System) based on PMSG (Permanent Magnet Synchronous Generator). A position sensorless operating method for direct-drive PMSG using sliding mode observer is proposed. With this method, position angles can be estimated only by measuring phase voltages and currents. By analyzing the cause of angle error, which increases when the PMSG is operating at high speed, a new dynamic angular compensation solution is developed. This method proves to be effective and necessary by experiments based on simulink.
Research on Function Partitioning and Granulating Control in Product Design
Authors: Ma Xing Guo , You Xiao Mei , Wen Bang Chun
Published: October 2011

In order to have a correct strategy of function partitioning in product design, the function partitioning and the function granulating were discussed based on the studying on reasoning process of function optimal design. The rules of function partitioning were introduced. Further, a decoupling method in function partitioning was put forward, and a rule of granulating controlling was put forward. Then correctness inspecting of function partitioning was discussed by establishing a function structure of an internal-combustion engine. The results show that the function partitioning should comply with the abstract rule, independence rule and granulating controlling rule; Decoupling is possible by a correct strategy of function partitioning; The function need not be partitioned to the minimal units (the function units or basic functions), and when the partitioning is ended depends on the experiences and the knowledge of designers to a large extent.
Research on Motion Characteristic of an Integrated Testing System for High-Speed Train End Relationship Test
Authors: Wang Ying Bo , Zheng Shu Tao , Huang Qi Tao , Xu Hong Guang , Han Jun Wei
Published: October 2011

To test the motion characteristic of parts between two train cabinets, an integrated testing system based on the Stewart parallel manipulator for train end relationship has been built in the National Engineering Laboratory for System Integration of High-speed Train. It analyzed the kinematics of this system and carried out series of experimental test. The results of static positioning test and dynamic tracking test show that the testing system has a good characteristic of motion simulation. This is the first time that the Stewart parallel manipulator is applied in high-speed train field.
Study on Elements Distribution of Al-Base Alloy’s Weld by Laser Welding with Filler Material
Authors: Huang An Guo , Hu Shu Hui , Li Zhi Yuan , Wang Yong Yang
Published: October 2011

To figure out the elements distribution in the seams, laser welding was carried out on the Al plates which coating with Si powder and Cu powder respectively, then electronic probe was used to analyze the microstructure in the section of the seams. Results indicated that alloying elements distribution in the weld is heterogeneous under the metal liquid movement in welding pool and the elemental diffusion co-functioning. There are two high concentration regions on both sides of the weld centerline, the content at the center is low, slightly higher and more homogeneous at the bottom. The distribution of the alloy composition in the weld is related to the specific gravity of the alloying elements. Though the specific gravity of Si and aluminum matrix is similar, it can flow with the liquid metal in the pool, so the concentration changes of Si in the weld are larger. Elemental fluctuation keeps steady in the weld joint.
Research on a Novel Two-Phase Hybrid Stepping Motor
Authors: Man Yong Kui , Ma Yu Yan , Zhao Yu Shuang , Xu Chang Cheng , Hao Wen Sheng
Published: October 2011

In this paper, the mechanical structure of a novel two-phase hybrid stepping motor, which offers big transmission ratio and fast response characteristics, is proposed. Comparing with typical two-phase hybrid stepping motor, permanent magnet of the new model is placed on the stator, thus it has better utilization of space than conventional two-phase hybrid stepping motor. Furthermore, new two-phase hybrid stepping motor torque mathematical model is established. And the two-phase hybrid stepping motor torque vector analysis method we provide here provide you with an intuitive way of research on the new type two-phase hybrid stepping motor operation principle and control mode.
Research on Wear Debris Recognition System Based on ART and Gray Level Co-Occurrence Matrix
Authors: Kang Jian Li
Published: October 2011

Wear debris recongition system is researched,which is based on adaptive resonance theory of artifical neural network(ART) and gray level co-occurrence matrix.The ditailed process is as follows:the first,according to gray level co-occurrence matrix theory,wear image refining feature parameter algorithm is researched; the second,in order to solve the wear debris classification,which is built on the wear image refining feature parameter algorithm, wear debris classification ART algorithm is researched;at last,a series of experiments,which is based on the algorithm,are processed.The theroy derivation and experiment results prove that the wear debris recongition system is feasible in recognition accuracy and algorithm convergence speed.
Path Point Calculation and 3D Coordinate Display for WMR Based on Vision
Authors: Gao Hong Wei , Luan Chang Yi , Yang Hui Ying
Published: October 2011

According to the path point calculation, display and motion simulaiton problem for wheeled mobile robot(WMR), two kinds of path point calcualtion method are discussed from 2D and 3D space in this paper. The simulation results based on the motion simulation platform prove the validity and practicability of the proposed method.
The Application Research of Matlab in Heat Exchanger Tube and Shell Pressure Drop Test Process
Authors: Liu Wei Na , Pei Xue Liang , Yang Li Feng , Yuan Jun , Nie Xiu Min
Published: October 2011

Based on the powerful function of MATLAB software in curve fitting of data, this paper introduces the commonly used method of MATLAB in curve fitting, and uses the polynomial fitting function provided by MATLAB to curve fitting the experimental data of the pressure drop determination of the tube side and shell side of the heat exchanger.The results show that it is much easier and more accurate than traditional ways to curve fitting using the MATLAB.
The Requirements Stability of Control and Measure about Software Project
Authors: Song Lian Gong
Published: October 2011

In the development of software project, requirements stability is an important factor which relates to success or failure of software project. This paper made a detailed analysis of the factors of affecting the requirements stability, proposed the control method of the requirements change, and has conducted the research on the measure of the requirements stability for achieving the purpose to grasp the degree of the requirements change effectively, minimize the defects and risks caused by it, and ensure the successful completion of software project according to a predetermined cost, schedule, and quality.
The Study of Anti-Interference Measures of PLC Application System
Authors: Zhao Xue Mei , Sheng Guang Lei
Published: October 2011

This paper describes that: PLC applications are subject to threat of various interference in a complex industrial environment, It seriously affected the normal safe operation of the PLC. In the design of application system, We should take appropriate measures of reliability to eliminate or reduce effect of disturbance in order to ensure the normal operation of the system. Paper discussed specific measures to suppress interference from the power supply, inductive load handling, reasonable layout, grounding, input and output circuits, equipment selection and other aspects.
Research and Implementation on the Quality Controlling Method of NURBS Curve
Authors: Ai Ping , Zhao Bo
Published: October 2011

In CAID software based on NURBS technology, the quality of curve directly affects the quality of surface, and the post-editing and modification of the surface, so good curve is the core and key to build high-quality surface. In this paper, combining the basic theory of NURBS curves with practical experience, we conduct an in-depth study in the method of controlling the quality of the NURBS curves, and propose an implementation to improve the quality of the NURBS curves.
Establishing Model of Adaptive Control in the Optimal Fishing Strategy Based on Quantum Control Techniques
Authors: Chen Fu Yang , Qi Rui Yun , Jiang Changan
Published: October 2011

In this paper, the problem about establishing model of adaptive control in the optimal fishing strategy based on quantum control technique is proposed. An equation satisfied by fish stocks in a fishing conditions is obtained. Based on the stability analysis the question how to control fishing to the maximum sustainable yield and economic benefits is presented. The model of fish stocks growth in a fishing condition is established on calculus of variations. In the changes of fish prices, fishing cost, the inflation rate and bank loans, the fishing quantity is adjusted to obtain the maximum economic benefits through adaptive control methods and quantum control techniques. Analysis results have shown the validity of the proposed method.
Appling of New Optical Measurement and Theory in Mechanical Properties of Thin Film
Authors: Yun Hao MA , Chao Lu Ping , Hsu J. S
Published: October 2011

The thesis aims to characterize the mechanical properties and stresses for thin films deposited on the circular substrates. First, the thin films with the same deposition condition were successively deposited on the distinct substrates using the evaporation technique. The phase-shifting Twyman-Green interferometer (PSTGI) was then employed to measure the warpage of the film-substrate structures and therefore the intrinsic stresses and thermal stresses can be calculated from the well-known Stoney’s formula. The coefficients of thermal expansion (CTE) and Young’s modulus of thin films were also obtained from the Stoney’s theory. Furthermore, the merit of full-field character of optical interferometry was used to propose a novel methodology using the Chen and Ou’s theory to improve the accuracy and to reduce the experiment procedures in the traditional measurement of the aforementioned mechanical properties. Finally, the measured results corresponding to the traditional and proposed methods were respectively substituted into their adopted theories to compare their difference. The results reveal that the accuracy of proposed methodology is considerably improved and the experimental procedures are reduced to those of the traditional methods.
Structural Stress Analysis of 16×16 InSb Infrared Focal Plane Array with Underfill
Authors: Yu Qian , Zhang Li Wen , Meng Qing Duan
Published: October 2011

To reduce the fracture probability of InSb infrared detector in thermal shock from room temperature to 77K, for 16×16 mesa structure InSb infrared focal plane array detector with underfill, here ANSYS, is employed to research the impacts from both indium bump diameters and heights on both Von Mises stress and its distribution. Simulation results show that when the diameters of indium bump increases from 20µm to 36µm in step of 4µm, the maximal Von Mises stress in the InSb chip increases slowly. Besides, when the height of indium bump increases from 8μm to 24μm in step of 8μm, the maximal Von Mises stress in the InSb chip reduces from 1200MPa to 1030MPa. Von Mises stress of Si readout integrated circuits is also much smaller than that of InSb chip.
Study on Rapid Casting for Complex Parts
Authors: Zeng Feng , Yao Shan , Jiao Zhong Fei , Zhao Shu Ming , Yang Tong
Published: October 2011

A rapid casting method for complex parts is presented. In this method, casting moulds with complex cavity are manufactured by self-created rapid prototyping approach which called Selected Laser Partitioning for Prototyping. After surface coating treatment for moulds, complex parts are obtained by centrifugal casting. As application cases, metal impeller was casted by this method. A self-developed five-axis coordinate measurement machine was used to process the surface measuring of impeller. The Dimension accuracy grade of impeller is CT-3 and the surface roughness is Ra 6.3µm through making comparisons directly between CAD model and point cloud data of impeller surface. The result shows that this rapid casting method which has the characters of simple technology and low production cost reaches the level of precision casting.
A New Logic Optimization Algorithm of Multi-Valued Logic Function Based on Two-Valued Logic
Authors: Qiu Jian Lin , Li Fen , Gu Xiang , Chen Li , Chen Yan Yun
Published: October 2011

We make an approach to the logic optimization algorithm including converting multi-valued logic into two-valued logic and converting two-valued logic into multi-valued logic. We discuss the algorithm converting two-valued logic into multi-valued logic on the basis of building an assignment graph and present multi-valued logic optimization algorithm. In this paper, we analyze and study the logic optimization algorithms based on mini-terms and design a software system on logic optimization. It overpasses testing of Benchmark and right validate and it shows that the function of the software system on logic optimization is good and the optimization efficiency is high by testing.
A New Approach to Sub-Pixel Corner Detection of the Grid in Microscopic Camera Calibration
Authors: Yuan Wang , Bai Cuixia , Wang Yi Gang , Yu Mei , Shao Feng , Peng Zong Ju , Fu Song Yin , Li Fu Cui
Published: October 2011

Camera calibration is one of the key technologies of Computer Vision. This paper presented a microscope camera calibration method based on grid sub-pixel corner detection for the particular application area of microscopic measurement. First of all, the actual corner coordinates information of the grid was obtained through the improved Harris corner detection method. Then, considering the distribution law of corner coordinates in the microscopic image, the paper obtained the sub-pixel corner coordinates by combining the quadratic surface and linear fitting. Finally, through the established non-linear camera model, the average error between fore-projection and re-projection grid corner coordinates was obtained by re-projecting the grid corner coordinates. Experimental results show that the sub-pixel corner detection algorithm is accurate and the final calibration error is 0.4637 pixels. Compared with improved Harris corner detection, the accuracy increased by about 52%, which is applicable to microscopic camera calibration.
Analysis of Conspiracies between Contractors and Supervisors in Constructions
Authors: Zhao Lei , Zhong Sheng
Published: October 2011

Owners, contractors and supervisors are key members included in construction projects. There are two kinds of principal-agent relationships among the three parties. Out of the consideration of maximizing the interests of owners, the author of this article integrates the three parties--owners, contractors and supervisors into a mathematical model, designs corresponding anti-conspiracy constraint method to prevent the conspiracy act of contractors and supervisors, and studies the game relationship among the three parties--owners, contractors and supervisors using the principal - agent theory.
Classification and Identification of Young Females’ Shoulder Shape Using the Fisher Discriminant Analysis Based on 3D Body Measurement
Authors: Zou Feng Yuan , Jin Juan Feng , Sun Jie , Li Ming
Published: October 2011

In order to improve the fitting of garment on shoulder, the measurement of 275 young females aged from 20-24 were taken with 3D-body scanner; the position data relating to the shoulder was conducted using cluster analysis, and extracted 5 characteristic indices that contained almost information of shoulder shape; the rationality of clustering shoulder shape to 4 different types was tested and verified through using one-way analysis of variance; then established the Fisher Discriminant Analysis (FDA) model to identify the young females’ shoulder shape. The result showed that the forecasting model of Fisher Discriminant Analysis (FDA) had excellent performance, high prediction accuracy, so it provided a new method to identify young females’ shoulder shape.
Disparity Image Inpainting with Improved Method Based on Exemplar
Authors: Yu Shu Chun , Yu Xiao Yang , Fan Jian Ying , Wu Hai Bin , Wang Yang , Feng Qiao Hua
Published: October 2011

To combat the problems of disparity image inpainting, an improved exemplar-based image inpainting method is proposed. The original stereo image we select which corresponds to disparity image is decomposed by TV-based decomposition and the structural information is obtained. The patch priority in the position corresponding to the disparity image is calculated by using the structural information, which reflects true characteristics of the original stereo image and disparity image. Experimental results show that inpainting performance is better with the guidance of this patch priority for disparity image.
Edge Detection for Noise Image by Wavelet Transform and Mathematical Morphology
Authors: Huang Hai Long , Wang Hong
Published: October 2011

It is much more complex and difficult for edge detection of noise image compared to edge detection of normal image，the analysis and study of edge detection of noise image has universal significance and practical value. Wavelet transform possesses good time-frequency localization characteristic and multi-scale analytical ability, mathematical morphology is a new subject based on set theory, which is very suitable for analyzing and describing geometrical feature of signal. Combining the advantages of wavelet transform and mathematical morphology, the paper proposes an edge detection algorithm, which mainly focused on noise image. For edge detection based on mathematical morphology, constructs an anti-noise operator of edge detection by improving existing operators and employs different direction linear structure elements; edge detection based on mathematical morphology can reserve details of edge effectively, ensure the continuity and integrity of edge detected. Experimental results show the proposed algorithm can suppress the interference of different density and different types of noise more effectively in comparison with several classical edge detection algorithm, thus improving the detection accuracy and robustness for different images.
Effect of Rack-Aware Placement in Cloud Storage System
Authors: Huang Zhen , Yuan Yuan , Peng Yu Xing
Published: October 2011

We are witnessing the rapid development of Cloud Computing techniques and services. Cloud Storage is widely applied in nowadays research and industry community. One of the most hottest topic in cloud storage is the data reliability. To ensure reliability under the condition of inexpensive hardware, several techniques are discussed and applied. We simplify and analyze the data reliability by a markov model, which includes the discussion of correlated failures and rack-aware placement. Our model aims to tell the effect of rack-aware placement for cloud storage systems.
General Fault Monitoring and Diagnosis Expert System Based on Fault Tree and Multi-Sensor Information
Authors: Zhang Ai Yu , Zhao Xiao Guang , Zhang Lei
Published: October 2011

Due to the limited generality of traditional fault diagnosis expert system and its low accuracy of extracting failure symptoms, a general fault monitoring and diagnosis expert system has been built. For different devices, users can build fault trees in an interactive way and then the fault trees will be saved as expert knowledge. A variety of sensors are fixed to monitor the real-time condition of the device and intelligent algorithms such as wavelet transform and neural network are used to assist the extraction of failure symptoms. On the basis of integration of multi-sensor failure symptoms, the fault diagnosis is realized through forward and backward reasoning. The simulation diagnosis experiments of NC device have shown the effectiveness of the proposed method.
Grid-Based Task Scheduling PMTS Algorithm
Authors: Qiu Jian Lin , Chen Li , Chen Jian Ping , Gu Xiang , Chen Yan Yun
Published: October 2011

This paper analyses the Min-min algorithm and its improved algorithms through the performances of load balance, time span, quality of service and economic principle. Based on the analysis of the merits of these algorithms, we propose an improved algorithm as PMTS (Priority-based maximum time-span algorithm) by integrating. In the instance of the application, we analyse and compare the performances of these algorithms, and experimental results show that, PMTS algorithm is better than other algorithms in the comprehensive performance of load-balance, time-span, quality of service and other aspects.
Matching Optimization of Ship Engine and Propeller Based on PSO-GA Algorithm
Authors: Ren Li , Zhang Wen Xiao
Published: October 2011

Matching performance of ship engine and propeller has a significant impact on marine propulsion efficiency. In this paper, a hybrid approach combining particle swarm optimization (PSO) and genetic algorithms (GA) is developed for matching optimization of ship engine and propeller. Based on ship theory, the matching performance of ship engine and propeller is analyzed. Considering the diameter, angular speed, picth ratio and disk ratio of propeller, a mathematical model is constructed in which the open-water propeller efficiency is taken as the objective function for matching optimization of ship engine and propeller. Integrating PSO with GA is presented to solve it, in which the mutation operator of GA is introduced to the PSO for the diversity of particles. The effectiveness of the approach is illustrated by a matching optimization example of ship engine and propeller.
Near Optimal Learning Rate BP Algorithm and its Application in Traffic Forecast
Authors: Qin Li Ming , Zhang Hai Tao
Published: October 2011

Aimed at the inadequacy of the standard BP algorithm, a near optimal learning rate BP algorithm (NOLRBP) is presented. Selecting the learning rate of the algorithm based on one-dimensional search algorithm of optimization theory avoids the blindness in determining the learning rate. Simulations show that the algorithm is superior to the standard BP algorithm (SDBP), momentum BP algorithm (MOBP) and variable learning rate BP algorithm (VLBP).
Orthogonal Genetic Algorithm and its Application in Function Optimization
Authors: Liu Han Min , Dai Guang Ming , Yan Xue Song
Published: October 2011

Traditional genetic algorithm trapped into the local minimum easily. Therefore, based on a simple genetic algorithm and combine the base ideology of orthogonal test then applied it to the population initialization, crossover operator, as well as the introduction of adaptive orthogonal local search to prevent local convergence to form a new orthogonal evolutionary algorithm. Through the series of numerical experiments, proved the efficiency of the new algorithm.
Research on FPGA Based Closed-Loop Motion Control System
Authors: Chen Zong Min , Yuan San Nan
Published: October 2011

This paper presents a Field Programmable Gate Array based closed-loop motion control system for stepper motors. It consists of three components, including closed-loop control unit, driving unit and feedback unit. To overcome some of the drawbacks with an open-loop stepper motor motion control system or a conventional servo system, a self adaptive algorithm is proposed. By detecting the difference between the command and feedback signals, measures are taken prior to the occurrence of loss synchronization. All of the control logic is implemented in one FPGA chip. Simulation and testing results are presented at the end of this paper.
Research on Mode of after-Sale Reverse Logistics Operation of Auto Maintenance Industry Based on Time Window
Authors: Hao Hao , Wu Xing Gen , Li Hong Yu
Published: October 2011

The author maintains that, with the quick development of domestic auto industry, the auto maintenance industry is progressing with high speed accordingly. The auto maintenance enterprise are inclined to focus on sales and forward supply chain operation, however, lacking of efficient resource and systematic management into reverse logistics operation, as lead to a few potential risks. In order to avoid and control the risks, the auto maintenance companies need to closely cooperate with channel supply chain partners, meanwhile build up the mode of reverse logistics operation with timing efficiency orientation. This mode consists of eight sub-system modules: organization structure, network planning and layout, reverse logistics operation procedure, time window evaluation mechanism, automatic replenishment system, reverse forecasting system, Kan-ban message system as well as disposal & reuse system. Furthermore, the article makes analysis of the internal operations and external relevance of these eight sub-systems. In recent years, with the overall opening up of road transport market and the rapid growth in domestic economy, the total number of China’s motor vehicles is entering a high-speed growth channel, and “the car goes to the country” policy further promotes the auto industry. Under the situation of quick development, the auto maintenance industry is developing by 10% to 15% each year as a young profession. According to the statistics, there are over 380,000 auto maintenance enterprises in our country at the moment, and various types of auto safety testing stations are built around one after another. The intense competition among auto maintenance manufacturing enterprises does not only focus on product quality, but also on the after-market reverse logistics. According to the statics of Gartner, 70 percent of resale is related with sales service, and 60 percent of resale is related with after market. However, except for few leading business enterprises which have realized the direct influence and value contribution of after-service reverse logistics to profit increase and customer loyalty and take action to pioneer the profit territory in the after-sale reverse logistics, the ‘price war’ is still the main competition method which the majority of enterprises adopt in the market.
Research on Regional Industry Competitiveness of Biomass Energy Based on Entropy Weight and TOPSIS
Authors: Shang Jie , Wang Ling Ling
Published: October 2011

Having 7.7*108 t/a of crops straw, 3.97*109 t/a of poultry and livestock manure, 1.48*108 t/a of municipal waste, China is in possession of good resource condition for the development of bioenergy industries. But the competitiveness of bioenergy industry is low. In order to improving the competitiveness of biomass energy industry, combining with system dynamics, according to the comprehensive evaluation index system, this thesis used the entropy coefficient and introduced TOPSIS method into the comprehensive evaluation of the biomass energy industry competitiveness. It has resolved the problem of artificial weighted evaluation that commonly used in weighted comprehensive evaluation. The results show that this method is practicable.
Semi-Supervised Clustering Algorithm Based on Small Size of Labeled Data
Authors: Leng Ming Wei , Chen Xiao Yun , Cheng Jian Jun , Li Long Jie
Published: October 2011

In many data mining domains, labeled data is very expensive to generate, how to make the best use of labeled data to guide the process of unlabeled clustering is the core problem of semi-supervised clustering. Most of semi-supervised clustering algorithms require a certain amount of labeled data and need set the values of some parameters, different values maybe have different results. In view of this, a new algorithm, called semi-supervised clustering algorithm based on small size of labeled data, is presented, which can use the small size of labeled data to expand labeled dataset by labeling their k-nearest neighbors and only one parameter. We demonstrate our clustering algorithm with three UCI datasets, compared with SSDBSCAN[4] and KNN, the experimental results confirm that accuracy of our clustering algorithm is close to that of KNN classification algorithm.
Simulation and Research of Aircraft Deicing Fluids Deicing Process
Authors: Chen Bin , Wang Li Wen
Published: October 2011

The aircraft ground deicing process and practical deicing model of aircraft on ground were introduced, a mathematic model was developed based on thermal and mass balance. In addition, a reference case was chosen to verify the mathematical model and four different spray parameters of deicing fluids were studied. And the simulation results indicated that the proposed model was effective to analyze and research the aircraft on the ground deicing process.
The Network Traffic Management Based on Queuing Theory
Authors: Wang Jian Ping , Li Xiao Min , Jiao Cui Ling
Published: October 2011

Traffic management can improve QoS of the network, the exist well-known algorithm for the network traffic management has some problems in the sensitive degree and the network reliability, using queuing theory build up the basic M/M/1 model for the network traffic management, obtaining the network traffic forecasting ways and the stable congestion rate formula, combining the general network traffic monitor parameters, realizing the estimation and monition process for the network traffic rationally. By testing the algorithm, we know that queuing theory can optimize the network traffic, it’s convenient and simple for calculating and monitoring the network traffic properly.
Study on Flute Design for End Mill Based on Oblique Cutting Model
Authors: Wang Guang Cun , Li Jian Feng , Sun Jie , Li Fang Yi
Published: October 2011

Aimed at the design of the radius of flute for solid carbide end mill, a new oblique cutting model for milling was established based on the simplified model of milling layer. Depending on this model, an equation was developed to calculate the maximum chip thickness in milling. An oblique cutting simulation via FEM(Finite Element Method) was conducted to verify the equation. The conclusion was that the result gained from the simulation was in a good agreement with the present model, so the present model is reasonable to predict the maximum chip thickness in milling and to determine the radius of the arc at the bottom of the flute.
Study on Kinematics Sensitivities of Folder Mechanism with Clearance
Authors: Yuan Ying Cai , Li Yan , Wang Yi Ming , Guo Qiang
Published: October 2011

High velocity and stability are the development trend and inevitable requirement, but the clearance would make the stability of mechanical system deceased, especially in high speed. To the folder mechanism with clearances in high velocity, combined with the definition of sensitivity and the kinematics analysis, the kinematics sensitivity analysis model is derived by the matrix analysis method. Through the sensitivity analysis model, it can be easy to get the relationship of the design variables and the mechanism’s robustness, which provides the base to design the folder mechanism in high velocity.
Study on Sensorless Control Model Based on a Model Reference Adaptive System with Parameter Optimization
Authors: Yang Jian Guo , Zhou Fu , Li Bei Zhi
Published: October 2011

A sensorless control model based on a model reference adaptive system (MRAS) with the theory of parameter optimization for the Permanent Magnet Synchronous Motors (PMSM) servo system is presented in this paper. The model can promptly work out the speed of the rotor without any other position/speed sensor. Different from the other MRAS-based speed observers which constructed according the theory of stability customarily, by using the error between the measured phase currents of actual motors and theoretic phase currents acquired by the mathematical model of motors as the parameter to be optimized, the proposed model can gain the speed of rotor with fast response and better performance. The stability of MRAS is analyzed subsequently. In the model, only a few parameters are needed and satisfactory performance can be achieved. So this model is very simple to be used as the position/speed observer of the PMSM servo system. Finally the simulation and experimental results confirm the validity and advantage of the proposed method.
The Hysteresis Model of Terfenol-D with Magneto-Stress Coupling
Authors: Meng Ai Hua , He Han Lin , Kong Min , Li Ming Fan
Published: October 2011

The output of Terfenol-D is nonlinear and hysteretic under the effect of magnetic field and prestress. The nonlinear constitutive relation between magnetostriction and magnetization with magneto-stress coupling was built in consideration of the magnetostriction saturation and the prestress correlation. Then, the hysteresis behavior of Terfenol-D was modeled based on the Jiles-Atherton model. The error of magnetostriction between simulations and experimental data is less than 6%. This result indicates that the model can adequately predict the nonlinear hysteresis and magneto-stress coupling character of Terfenol-D.
Variable Step-Size Wavelet Vector Machine Blind Equalization Algorithm
Authors: Guo Ye Cai , Zhang Zhi Chao , Xu Fang , Guo Shi Jie
Published: October 2011

In order to overcome the contradiction of the CMA with a constant step-size between the convergence rate and the residual mean square error(MSE), on the basis of analyzing the idea of variable step-size, the feature of Support Vector Machine(SVM) and Wavelet Transform, a Variable step-size Wavelet transform Support vector machine Constant Modulus blind equalization Algorithm (VWSCMA) is proposed. In the proposed algorithm, the variable step-size is used to solve the contradiction between the convergence rate and the residual MSE, SVM is employed to optimize the weight vector of equalizer, and wavelet transform is used to reduce the autocorrelation of input signals of equalizer. Simulation results show that the proposed algorithm can effectively overcome the contradiction between the convergence rate and the residual error and has good equalization performance.
Influence of Low Frequency Electromagnetic Field on the As-Cast Structure of Cu-10%Sn-2%Zn Alloys
Authors: Zhang Hai Tao , Li Bao Mian , Cui Jian Zhong
Published: October 2011

In this paper, the effect of low frequency electromagnetic field on the as-cast structure of Cu-10%Sn-2%Zn alloys and inverse segregation of Sn had been investigated. It is found that macrostructure and δ phase was refined, columnar-to-equiaxed transition was promoted, and inverse segregation of Sn was inhibited by applying electromagnetic field during the solidification of Cu-10%Sn-2%Zn alloys. The width of eutectoid structure (α-Cu+δ) becomes smaller, and the morphology of eutectoid δ changes from coarse acicular and massive shape to fine dotlike shape. The above mentioned effects become more obvious with the increasing of current intensity.
A Calculation Method of Velocity and Acceleration of Wheel Center Based on Rigid Multi-Body System Dynamics
Authors: Liao Shu Hua , Yang Cai Hong
Published: October 2011

On the basis of calculation of velocity and acceleration in multi-rigid body dynamics,velocity and acceleration formulas of wheel center are established when dynamic equations of vehicle are built. Adams software is used to test correction of the method ,demonstrating high accuracy of the way， which provide theoretical basis for dynamics model of vehicle.
The Study on Heat Transfer and Solidification of Uniform Droplet Formed from Jet Breakup
Authors: Gao Sheng Dong , Wang Yang , Wang Hong Bo , Wu Yan
Published: October 2011

An experimental device capable of producing uniform metal droplet stream and electric charging and deflecting has been developed. Uniform spherical powder of 180μm in diameter was obtained after cooling and solidification. Numerical models of heat transfer and solidification of droplets were established. The thermal history including solid fraction of droplets in uniform droplet spray process were calculated. Under the common processing conditions, the cooling rate of a droplet of 180μm diameter is of the order of 103−104°C/s. To obtain homogeneous and dense preforms, the substrate should be positioned at a distance of 1.1-1.3m from the nozzle.
Thermal Error Modeling of Machine Tools Based on M-RAN
Authors: Han Jian , Wang Li Ping , Cheng Ning Bo , Wang Xu
Published: October 2011

Thermal error in machine tools is one of the most significant causes of machining errors. This paper presents a new modeling method for machine tool error. Minimal-resource allocating networks (M-RAN) are used to establish the relationships between the temperature variables and thermal errors. Pt-100 thermal resistances and eddy current sensors are used to measure the temperature variables and the thermal errors respectively. A machining center is used to experiment. The test results show that method with minimal-resource allocating networks can predict the thermal errors of the machine accurately.
Three-Dimensional Effective Elastic Moduli for Multi-Directional Hybrid Filament-Wound Cylindrical Shell with Lining
Authors: Ruan Wen Jun , Yang Qing Ping , Xu Guang Lei , Wang Hao
Published: October 2011

A method based on laminated plate theory is presented for estimating three-dimensional effective elastic moduli of multi-directional hybrid filament-wound composite cylindrical shell with lining. The method introduces a factor of hybrid effects. The effective elastic moduli of glass/epoxy fiber-wound tube with lining and glass/carbon/epoxy hybrid fiber-wound tube with lining are predicted by present method respectively. It is shown that the method is simple and accurate.
A Study on the Key Technology of a Remote Water Quality Monitoring System Based on ZigBee
Authors: Wang Jian
Published: October 2011

This paper has proposed a remote water quality monitoring system based on ZigBee. The core of this system is the ZigBee wireless sensor network and GPRS network. Adopting the WSN tree routing structure and false alarm optimization algorithm, it can realize the remote detection and real-time monitoring of water quality. The clients can get access to the present and historical information of water quality conveniently，on which reasonable judgments can be formed to help with the management of water resources. The test in the West Trunk Canal of the Four-Lake Basin shows that the system has a high stability, high efficiency and great expandability.
New Progress Concerning Research of Product Design Theory and Methods
Authors: Wen Bang Chun , Li Xiao Peng , Wang Zong Yan
Published: October 2011

The product design theory and methods based on “the Scientific Outlook on Development” have been set up by our group in recent 10 years, The new progress concerning Research of product design theory and methods include: 1) QCTES was instead of IQCTES including six requirements of product design; 2) traditional design stages were replaced with four new stages including investigation, planning, implement and inspection; 3) green design was replaced with harmonious design; 4) traditional design method was replaced with deep-layer design method; 5) concept and connotation of product top-layer design were proposed; 6) more detailed contents of product synthesis design method were advanced. We got good effects to apply above product design methodology on many product designs recent years.
An Improved Fractional Differential Algorithm and Noise Immunity Analysis
Authors: Liu Yu Ran , Hou Ming Liang
Published: October 2011

Texture and edge information are equally important to identification of most of natural images. To the problem of the existing integer order differential operators can’t extract texture information form the images, this study developed a fractional differential algorithm, which can extract texture and marginal information simultaneously, based on settlement of the drift problem of fractional differential operator. Experimental results showed that our algorithm can not only extract texture information but also extract more edge information than the traditional algorithms. And to the image with Gauss noise, our algorithm also have noise immunity.
Research on Wind Environment around Residential Buildings with Different Planning and Design Factors
Authors: Li Qiong , Meng Qing Lin , Zhao Li Hua
Published: October 2011

In this work, a field survey is performed in 309 residential building clusters in South China to obtain the basic characters of urban planning and design of residential buildings in this area. Based on it, the basic model of residential building clusters in this area is established, and CFD method is used to simulate the outdoor wind environment around residential buildings with different planning and design factors. The influence of building coverage ratio on the pedestrian spatial mean velocity ratio under 16 wind directions is found to be more remarkable than those of the floor area ratio and building layout. 10% increase of the building coverage ratio results in 0.1 linear decrease of the mean velocity ratio under 16 wind directions at the pedestrian level.
Characterization Model for IC Reference Material
Authors: Zhang Ting , Shi Jian
Published: October 2011

Not all of the measurement data of IC (Integrated Circuit) reference material are valid, so some work would be do to eliminate the null and wrong ones. This paper presents an algorithmic model of the characterization for IC reference material, which can help choose the valid data for the property value validated of IC reference material. The experimentation results of the characterization procedure are detailed in the paper, which proves to be helpful steps to IC reference material characterization and preparation.
Design and Develop a CSCL Tool Based on Silverlight
Authors: Ren Jian Feng , Guo Li Na
Published: October 2011

With the changes of learning psychology and information technology, CSCL tools should also keep up with the times and meet the growing needs of learners. The appearance of RIA can make up the deficiencies of Web-based CSCL tools at present. With the use of RIA, the next generation tools could be realized with high interactivity and richer user interfaces. Silverlight is one of mainstream technologies of RIA, and it has the advantages of better user interfaces, high development efficiency, newer way of communication, and so on, which other RIA technologies could not reach. In order to facilitate collaborative knowledge construction of learners, the paper design and develop a Web-based CSCL tool which has the function of real-time interactivity with words or graphics.
Design and Research of Sand Scraping Mechanism of a New Railway Sand Removal Vehicle
Authors: Cui Zhao Xia , Guo Si Jia , Qin Jian Guo , Yang Tao , Hou Shou Quan
Published: October 2011

Railway plays an important role in transportation system in China or many other countries. In order to solve the problem of cleaning sand-covered railway in western areas of China emergently, a new railway sand removal vehicle is studying, and as the most important mechanism, the sand scraping mechanism affects entire efficiency and even determines the success or not of the whole vehicle, therefore, structures of the mechanism were designed and further studied by using UG and ANSYS software.
Design of Automobile Airbag Multi-Point Ignition System Based on Piezoelectric Converter
Authors: Xiao Hong Bing , Yen Kang K. , Bai Chun Yu , Xing Su Xia
Published: October 2011

Automotive industry is being one of the major supporting forces for the economy of many countries. The requirement of higher standard on safety figure for cars has demanded engineers to design automobile airbag systems with high performance. Since the ignition system is one of the major units in an airbag system, a design of a high-voltage piezoelectric converter which can be implemented in airbag ignition systems is studied in this paper. The selection of the piezoelectric transformer can improve the reliability by increasing the ignition energy. Using the multi-point ignition scheme to measure the orientation of the airbag detonation, the accuracy of the airbag ignition can be improved and the accidental injury caused by collisions can be further reduced. Besides, a good solution to synchronization problems is provided by using multi-point synchronization control and multiple air bags.
Finite Element Analysis on Fatigue Failure Prediction of a Rear Axle Housing of Vehicle Based on Cosmos
Authors: Lu Sen Kai , Su Jian Huan , Liao Shu De , Su Jia Qiang , Wang Bo , Yu Liang , Jiang Yan Li , Wen Shou Hong
Published: October 2011

On the basis of analyzing the typical operating conditions of a vehicle model, 3D model of the rear axle housing was formed by using the Solidworks software, and the stress, strain and the fatigue life of the housing were obtained by using of Cosmos software with the method of finite element analysis. In the effect of alternating stress, the rear axle housing was found existing crack defects. The results showed that the rear axle housing life cycle was improved to over 5.0×105 and satisfied the design requirement. Results provided from tests were compared with the analyses also. It indicated that the proposed method of finite element analysis was a good and efficient method to predict the fatigue life of rear axle housing, which can provide reference for the design of that rear axle housing.
New Type of Fireproof Structure Experimental Research
Authors: Liu Wen Si , Yang Zhi Qing , Zhong Chen Hua , Mo Hai Feng
Published: October 2011

this paper firstly designed a three-layer fabric and a fireproof air layer structure which is formed by the three-layer fabric, then studied fireproof and heat insulation performance of the designed structure by analysing results of a series of contrast experiments, finally got the best design project, experimental results show that it is feasibility to apply the designed air layer structure in fire safety work.