bluuebunny/crossref_metadata_2025 huggingface dataset:
Principles and Practice of Modeling in CAD
Authors: Šedivý Josef , Hubalovsky Stepan
Published: August 2013

Computer Aided Engineering are all tools for implementing of simulations and engineering calculations on 3D digital models and assemblies created in the CAD module. Computational algorithm works based on Finite Element Method - FEM. In connection with the design of structural design out strength calculations to determine the stress and strain in the loaded part of the structure is usually carried out. A network of elements is defined on a 3D digital model or assembly. Geometric and structural boundary conditions are specified according to functionality of construction.
Study on Forklift Cockpit Design Based on Ergonomics
Authors: Liu Niu , Sun Hong , Zhu Wei Guo , Ma Yu Ping , Gong Xue
Published: August 2013

With the application of ergonomics in product design increasingly widely, humanization design of products has become a new revolution in the field of design. Based on the study of ergonomics, taking the forklift as an example, combined with the human body size data, operating characteristics and other factors, this paper analyzes the forklift cockpit human factors, such as the overall space layout, the human-machine interface design and the manipulation device arrangement, and proposes the concept of people-oriented forklift cockpit design. The research has taken an important step in this area of the modified forklift cockpit.
Study on Application Technology of Large Inclination Belt Conveyor in Dujiacun Mine
Authors: Kong Jie , Liang Kai , Chen Kai , Zeng Yi Jie , Wang Cheng Gang
Published: August 2013

Through summarizing and analyzing the design and application characteristics of large inclination main belt conveyor, it is shown that the large inclination conveyor can not only overcome the problem of large inclination main inclined shaft, but also has the advantages of large delivery capacity, high automation level, high safety and reliability, simple operation and maintenance, economizing manpower and thingpower. It achieved good results in the application of large inclination inclined shaft in Dujiacun mine and generated great economic benefit.
Size Effect in Sintering of Micro Metal Injection Molded Part
Authors: Jang Jin Man , Lee Won Sik , Lee Hyong Jae , Kim Yong In , Ko Se Hyun , Son Seong Ho , Park Sung Cheol
Published: August 2013

Micro gears with different dimension were fabricated by micro metal injection molding and sintering behavior of the micro gear was investigated. For this, ultraprecision micro molds were prepared by micro electroforming. The sintered micro gears had outer diameter of 470μm and 250 μm, respectively. From the sintering results at 1200°C and 1250°C, the grain growth and the degree of thermal etching depend dominantly on the size of micro part rather than micro feature size. The sintering temperature of micro parts should be lower than that of macro components.
Turbine Blade Straddle Root and Rim Structural Optimization Using Finite Element Contact Analysis
Authors: Zhang Yi , Zhang Ming Hui , Xie Yong Hui
Published: August 2013

The development of turbine blade root style is one of the key problems in the blade design technology as the root carries most of the loads of the whole blade. The optimal design problem and the corresponding numerical method were established for a straddle root structure with the minimum equivalent stress of the root and rim as the optimal objective. A multi-variable parametric model of the blade and rim, which took eight critical geometrical variables of the root and rim as design variables, was built by APDL (ANSYS parametric design language) and the optimal problem was numerically solved by combining pattern search algorithm with finite element method. The results indicate that the optimized structure has better strength performance, whose maximum equivalent stress of the root sharply decreased by 25.18% comparing with the original design. It eventually confirms the feasibility and validity of the proposed optimal design method.
Manufacture and Properties of P/M Bearing Caps
Authors: Qin Wan Zhong
Published: August 2013

P/M main bearing caps are important structure parts in automotive engines. They have special shape and high precision and endure complicated load in using. After analysis the structure and property characteristics, we use Fe-C-Cu-Ni material, double-action-floating-pressing technology, liquid-phase sintering technology to develop the P/M bearing caps. After a series of test, inspection and loading test, we defined the manufacture technology of bearing caps and realized mass production.
Force Analysis of Magnetic Levitation Micromotion Stage
Authors: Lei Yong , Gao Er Jin
Published: August 2013

This A new method of magnetic levitation micromotion of AC / DC hybrid driving is presented in this paper presents, and a new magnetic levitation micromotion stage has been designed, which can be realized that the motion stage translationally motions, respectively along the three directions x-axis, y-axis, z-axis, and rotates respectively around the three directionsθxθyθz, namely, the micro-motion in the six-dimensional space of freedom, as well as the micro movement of the constant height. Force analysis has been carried out on the micromotion stage, and the relationship curve between the winding current and the air gap, as well as the force of the micromotion stage, has been drawn. Finally, the stability in the open-loop state and one-dimensional micro-movement of the magnetic levitation micromotion stage have been tested. According to the simulation result of the stability ,it shows that the stability of the magnetic levitation micromotion stage can be achieved at the equilibrium position, and according to the simulation result of the one-dimensional micro-movement ,it shows that the motion range whthin 50mm along the direction of x-axis can substantially coincide with the theoretical analysis. The feasibility of the design presented in this paper of the magnetic levitation micromotion stage can be validated by the simulation result of the stability and one-dimensional micro-movement.
The Research of a New Method for Manipulating Magnetic Beads through Multi-Layered Flat Micro-Coils Coupled with Permanent Magnet
Authors: Liu Zhi Hua , Huang Yu Feng , Li Jian Peng , Xu Xin Wei
Published: August 2013

Magnetic bead droplet's non-contacted manipulation can be realized in Electromagnetic MEMS, but how to achieve magnetic beads manipulation is the major problem. A new method of multi-layered flat coils coupled with permanent magnet was proposed. Firstly, the theory of magnetic bead manipulation was analyzed and the main factors affected the magnetic beads manipulation was identified; then the magnetic field of multi-layered flat coils and Stokes viscous resistance of magnetic beads were analyzed and simulated quantificationally; finally the magnetic bead capture area was got under different flow velocity. Consequently the feasibility and correctness of this method was verified.
Application of Spline Function in Solution for Pressure Angle of Oscillating-Roller-Followed Cam
Authors: Dai Chun Xiang , Yu Jing Hua , Meng Hong Yu
Published: August 2013

Due to uncompleted cam basic parameters or unknown motion functions of follower, it is difficulty to calculate pressure angle for cam mechanisms while only given some discrete points on actual cam profile. After the research of solution for pressure angle of the oscillating-roller-followed disk cam used in cold forging machine, the article brings foreword detailed solutions under such condition above based on cubic spline interpolation function.
Design of Virtual Prototype for Cold Roll Forming Machine of Side Panel of Engineering Vehicles and Numerical Simulation of the Forming Process
Authors: Huang Qiu Bo , Song Jun Rui , Yang Qing Bo
Published: August 2013

In this paper, based on the engineering vehicle’s side plate cold roll forming machine developed by a company, we use 3D solid modeling software Solid Works to complete the establishment of a 3D model. On the basis of explicit dynamics elastoplastic finite element method basic theory, we make numerical simulation analysis of the metal plate’s forming process by using ANSYS/LS-DYNA module. According to the simulation results, we make repeated adjustment and optimization on its pass system and parameters. Through the numerical simulation of the forming process, we conclude the stress-strain distribution of the sheet metal. For similar products, the result has a certain reference value to the research of cold roll forming process and the design of cold roll forming equipments.
Research on the Coal-Based Direct Reduction of Vanadium Titanomagenetite
Authors: Jiang Tao , Guan Shan Fei , Xia Yi , Yu Shao Wu , Xue Xiang Xin , Bai Rui Guo , Chen Dong Hui , Chang Fu Zeng
Published: August 2013

This paper investigates the impact of additives and cooling way on the metallization rate of reduction product by the experiment of the coal-based direct reduction of vanadium titanomagnetite ; The promotion of direct reduction product metallization by additive species, additive content, reduction time and cooling way was studied and the optimal condition was found; when used 3% CaF2 as additive reduced for 0.5h and used water quenching to cool down the product, finally got the product which metallization got 93.80% and 42.93% higher than the null sample.
Robust Reliability Design of Banjo Flange Based on Bayesian Theory
Authors: He Xiang Dong , Qi Wei , Jin Yan
Published: August 2013

The perturbation method, bayesian statistics theory, the reliability optimization design, the reliability sensitivity technique and robust design are employed to present a practical and effective approach for the robust reliability design of the Banjo flange under incomplete information. The theoretical formulae of robust reliability design for the Banjo flange under incomplete information are obtained. The respective program can be used to obtain the robust reliability design parameters of the Banjo flange under incomplete information accurately and quickly.
Multiple-Objective Optimal Control of Hybrid Electric Vehicle
Authors: Yan Jun
Published: August 2013

To reduce the fuel consumption and exhaust (HC, CO) emissions of parallel hybrid electric vehicle, the control strategy of the hybrid electric vehicle is studied in this paper. First it briefly analyzes the structure and working principle of the parallel hybrid electric vehicle drive system. Then a cost function is proposed which explains the fuel consumption and emissions. According to the minimum principle the minimum of the cost function can be got, consequently, the optimal control strategy can be obtained. Furthermore, in order to verify the effectiveness of the optimal control strategy, in MATLAB environment, it establishes a dynamic simulation model for hybrid electric vehicles. Through a comparative study between the optimal control strategy on and the traditional rules control strategy, the results of experiment it reveals that the optimal control strategy can effectively reduces fuel consumption and emissions of hybrid electric vehicles.
The Dynamics Studies of a Four-Axle Bogie of Locomotive
Authors: Zhang Xiao Xia , Ma Yu Qiang
Published: August 2013

A type of bogie structure was proposed for the eight-axle locomotive, of which the middel bogie forme was used to connect the two B0 bogie and support the car body with three suspensions. A single drawbar connect the B0 bogie and car body directly to transfer the longitudinal forces. This structure is simple and feasibility, which can achieve high adhesion availabillity and good dynamic performances. Three suspension can achieve a excellent stability of car body. Comparing with a same speed and axle load class 2C0 locomotive, the wheelset lateral force and wheel rim wear factor are reduced by about 35% at the R300m small radius curves, and the wheelset lateral force is decreased by 15%, and the rim wear factor is reduced by 23% at the R800m curves.
Research of Comparison between Different Calculation Methods in Wheel-Rail Contact Geometry
Authors: Zhang Hai , Wang Cheng Guo , Xiao Qian
Published: August 2013

Wheel-rail contact provides interface between moving vehicles and track system. Wheel-rail contact affects strictly vehicle motion, which it depends on the geometry profile of the wheel and the track, the materials and the working circumstance. The paper describes in detail trace method, three-dimensional projection profile method, and compares them with result from Adams RSGEO when calculating wheel-rail straight contact geometry. The result shows that radii difference of rolling circle keep in same when wheelset displacement is under 7.5mm. But there are many difference when wheelset displacement exceed 7.5mm, and result from three-dimensional projection profile method more approached one from Adams RSGEO.
The Influence and Suppression of Nonlinear Friction
Authors: Yang Jian Jun , Wu Qin , Lei Chun Li , Feng Rui Cheng
Published: August 2013

Direct at NC machine tool feed system, the article analyzed the influence of the nonlinear friction at each motion joint, and points out that the nonlinear friction are the main factors that influence the positioning accuracy of the feed system. The article have discussed the methods for effectively compensation and controlling of the nonlinear friction respectively from two aspects of flutter compensation and predictly controlling the nonlinear friction, and proved the correctness of the compensation and control method that is proposed in this paper.
Study on acc/dec Algorithm Based on Piece-Wise Polynomial in CNC
Authors: Ji Guo Shun
Published: August 2013

In order to improve the stability of feed movement in high speed CNC system, the feedrate planning algorithm based on piece-wise polynomial function was proposed. The flexible transition of feedrate was realized through maintaining linear continuous jerk. The principle of the proposed algorithm was introduced and the method to generate smooth motion profile based on the proposed algorithm was presented. The proposed algorithm is simple and it can be applied in acceleration/deceleration before interpolation in high speed feed movement to improve the stability of it. The proposed algorithm was applied in multi-contour high speed processing and the result indicated that it could improve the stability of large-scale parts motion.
Down-Shift Control for Wet Dual Clutch Transmission Based on FCMAC
Authors: Xu Chun Hua
Published: August 2013

In order to solve the problems existed in gearshift with wet dual clutch transmission; the down-shift control strategy is developed on the basis of analysis on gear shift process. Clutch pressure intelligent control arithmetic based on FCMAC (Fuzzy Cerebellar Model Articulation Controller) is designed to realize accuracy control of clutch pressure. The transmission control unit is designed, and the control program is written. Taking down-shift from 2 to 1 for example, down-shifting control strategy was drawn. After applied the introduced method into the experiments on both power-on and power-off downshift under different throttle positions, ideal shifting quality was achieved. The result indicated that the speed of vehicle changed gently without distinct impact. This essay verifies the validity of the proposed method of the strategy of shifting control.
Kinetic Characteristics and Force Rules of Three Pairs of Dowel Bars Equal-Offset Space RCCR Mechanism
Authors: Cui Chao , Zhuang Sen , Han Bo , Lu Wei , Liu Zhong Yi
Published: August 2013

To solve the instability of the single pair bars RCCR mechanism, the analysis of kinetic characteristics and force rules of three pairs of dowel bars Equal-offset space RCCR mechanism was done. And then the simulation of the theoretical results was verified by SolidWorks simulation software. Finally ,the important conclusions are obtained.
48″900lb Full-Welded Ball Valve Wall Thickness Optimal Design
Authors: Mo Chun Li , Li Gang , Chen Yong
Published: August 2013

Fully-welded ball valve has been applied in large oil and gas pipelines, and its quality is directly related to the safety of the transportation of national energy. The wall thickness of 48900lb ball valve is greater than theoretical design thickness. In this article, FEM software was used to design minimum wall thickness using linear stress analysis method. Though changing wall thickness under design pressure, the minimum wall was 95mm which calculated by linear stress analysis method can provide theoretical support for practical engineering application.
Application in the Experimental Data Analysis of the Slag Viscosity with Minitab Software
Authors: Zhang Shu Qing , Lv Xiu Ling , Zhang Li Hong , Zhang Na Hui
Published: August 2013

The single factor variance of viscosity experimental data of blast furnace slag was calculated by Minitab software. The influence of slag basicity and chemical compositions on the slag viscosity was obtained. The results show that there have insignificant effects on the slag viscosity when the slag basicity is over than 1.02, MgO content is less than 11.95% or TiO2 content is less than 12.57%. While the slag basicity can be influenced significantly with the slag basicity less than 1.02, MgO content over than 13.95% and TiO2 content over 13.57%. The Al2O3 content of the slag should be less than 12.75%.
Analysis of Factors Affecting Safety Management of Construction Site Based on Fuzzy Factor Analysis Model
Authors: Shen Long Jiang , Shi Suo
Published: August 2013

Thirty-nine influential factors of construction safety are identified in this study, and then five categories of respondents estimate their influential degrees through a questionnaire survey. In order to analyze these factors more accurately, a fuzzy factor analysis model (FFAM) is proposed. After calculating fuzzy eigenvalue, fuzzy correlation coefficients and factor loadings matrix in the model, seven different common factors are extracted. Finally, the author put forward several effective measures for improving construction safety based on these common factors.
Simulation Analysis of the Capture Strategy Impact of Seeker Capture Probability
Authors: Zhang Guo Dong , An Jing Xin , Liu Zhong
Published: August 2013

Whether can seeker capture the ship target in target group is one of the important factors affect the anti-ship missile efficiency. By establishing the target capture probability models under various capture strategies and giving the Monte-Carlo simulation flow, this paper obtained the capture probability under various capture strategies by statistical methods. The result shows that because of the lack of comprehensive consideration of battlefield situation, the existing target capture strategies are difficult to finish the capture ship targets task efficiently; the result also indicates the target capture strategies direction.
Experimental Study on Recovery of Kronos from Iron-Separation Tailings
Authors: Liu Shu Xian , Wei Shao Bo , Xu Zhi Shuai
Published: August 2013

It is determined through analysing the feature of tailings of Hebei iron stone, which contains TiO2 7.18%, adopting“high intensity magnetic separation-shaking table concentration. The results show that the concentrate with a TiO2 grade of 27.31%, recovery87.75% and productivity 23.07% and the tailing with a TiO2 grade of 1.14%, recovery12.25% and productivity 76.93%.
Design of Highly Efficient Multi-Point&Multi-Channel Temperature Acquisition System
Authors: Wang Zhi , Xiang Wei
Published: August 2013

To achieve a high speed multi-point temperature acquisition with a low cost,this paper used the methods as following:In the aspect of hardware,adopted “multi-point&multi-channel” structure(detailed content in main text);In software aspect,by a parallel synchronous fast reading algorithm, this achieved efficient processing.The program learned from the operating system interrupt algorithm to optimize the interrupt program. By experiment, the system achieved the effect of concurrent reading, realized the efficient and precise system operation.
Optimization of Diesel Engine Based on the Dependency of Rough Set Theory
Authors: Tian Jing Yi , Yang Ye , Zhang Si , Zhao Wen Jing
Published: August 2013

To get an effective way of monitoring the diesel engine vibration signal, the author puts forward an optimized method based on rough set attribute dependency. Decision table formed by different data collection form, their decision attribute dependence of condition is different, by comparing the different points of attribute dependence and take it as the quality criteria of measuring points, we can realize the optimization of measuring points. Take a high power diesel engine as an example, the site of rough set theory are used to calculate the typical attribute dependence, the results show that the method can effectively distinguish between different measuring point position and the sensitive degree of different fault types, the vibration signal monitoring position, with better effect is obtained at the same time reducing the effects of noise on fault diagnosis, to improve the accuracy and efficiency of fault diagnosis.
An New Error Detection Methods Produces Superior Software
Authors: Hao Li , Yang Zhong Shan , Zhang Yue Hong
Published: August 2013

Error detection is relatively a new field of Software level control. A Software Developer always aims to produce good level software with a few errors. Good level of software is correlated with the number of errors as well as it is limited by time. So, error detection is very important in the field of Software level and software stability. This paper gives you a explaining about software error detection. It describes the key areas of software error detection practice, and emphasizes some key open problems for the future.
Pulse Transit Time Variability Predicts Severe Hypotension after Spinal Anesthesia for Elective Cesarean Delivery
Authors: Sun Lei , Huang Chao , Shen Yan , Fu Xiu Quan , Hu Yi , Chen Hang
Published: August 2013

Hypotension after spinal anesthesia for elective cesarean delivery may be harmful. This article first proposed pulse transit time variability (PTTV) analysis could be applied in the preoperative assessment of its risk. 42 patients were classified into groups of Mild, Moderate and Severe. Frequency domain analysis was performed on the day before surgery using autoregressive model. We divided the frequency band according to the troughs and extracted relevant parameters of power spectrum, while differences between groups were evaluated by t-test. The results indicating significant differences are presented in PR5, PR1/PR5, PR3/PR5 and PR4/PR5, with their discriminant accuracy on the 42 patients reaching 80.77% in low-BP group and 75% in norm-BP group. We conclude PTTV analysis can help predict the risk of hypotension on the day before surgery and the physiological mechanism is mainly due to parasympathetic regulation.
The Study of Wear Matrix Model Test Improvement
Authors: Zheng Pu Yan , Wang Du , Yao Xiu Ping , Yuan Yan Zhou
Published: August 2013

The ball mills, which have great energy consumption, are commonly used in coal-fired power plant. The key to reduce their energy consumption is to determine the best ball loading, the optimum gradation and the complement parameters. The premise of determining these parameters is to give the balls wear law. The wear matrix model, which determines the balls probability distribution through their diameters, is one of the practice methods to determine the balls attrition rule. This study assessed the wear law through the change of balls weight, determines the program feasibility and the test time through the test of a ball mill.
Design of Remote Monitoring System for Power Based on Wireless Communication
Authors: Xiong Wei , Zhang Guan Hua , Zhao Yong Feng
Published: August 2013

To the inconvenience problem of laying the cable, a new remote monitoring system for power based on wireless communication is designed. The overall structure of system is put forward to bring the design method of the remote terminal unit which is the key of monitoring system. Adopting the commercial wireless serial data transfer radio to realize the wireless communication between center RTU or computer and remote field RTU. According to design the multiple control modes (including: remote manual control, remote automatic control, and local control) to introduce the application of system and indicate that it is satisfied to monitor remote field power in the aerospace experiment tasks.
Scanning Error Analysis of Transmission Laser Scanning Diameter Measurement System
Authors: Wang Yi , Cheng Jia , Chen Hong Shuo
Published: August 2013

Transmission laser scanning system can be used for high precision measurement of the shaft radial dimensions due to the advantages of containing no scanning lens and easy accessing to the high paralleled scanning beam. But as a dynamic optical system, its dynamic characteristics mainly depend on the scanning characteristics of the laser scanning emitter. That is, the scanning errors affect the accuracy of the measurement quite significant. The scanning model with procession characteristic was established in the presence of turntable shaft rotation instability. Furthermore, the equations of the optical encoder zero position trigger error caused by shaft radial runout and the motor speed adjustment error between the angle measurement error were derived respectively. Research has guiding significance for the laser scanning emitter structure design as well as the system measurement uncertainty analysis.
The Design of Embedded Mobile Database SQLite Based on the ARM11 Platform
Authors: Liu Chen Chen
Published: August 2013

For the problem of inefficient data access of the SQLite embedded database on S3C2440 (ARM9)-based hardware platform, this paper puts forward a design to transplant it to a more advanced S3C6410 (ARM11)-based platform. Through comparative experiments, this program is proved to be able to meet the needs of accessing mass data on the process of developing embedded program.
A Research on Principle and Parameter Design about a Kind of Antenna Working in Water
Authors: Wang Feng , Han Xiao Gang
Published: August 2013

Magnetic antenna has many advantages such as small volume, high SNR and no grounding needed. Especially in some special environment such as water, the superiority is more obvious. According to its basic principle, this article discusses the structure characteristics, pivotal parameter and fundamental devising thinking. Its operational principle is simple. There will be a response current when the magnetic line of flux passes through the hoop. Its resonance oscillation frequency is decided by the inductance and the electric capacity in the circuit. The coiling way and circle are the critical factors to its receiving feature except the permeability, the length and the thickness of magnetic material. The design must be sure impedance matching in order to keep the signal out in the most power.
White Organic Light-Emitting Devices Using the Blue and Green Fluorescent Emitting Layer Structure Incorporating with Red Phosphorescent Emitting Layer
Authors: Wu Li Shuang , Yang Hui Shan
Published: August 2013

Efficient white organic light-emitting diodes are fabricated with the blue and green fluorescent incorporating red phosphorescent emitting layer. The blue, green and red emitting layer consist of 1,4-bis (2,2-diphenyl vinyl) benzene (DPVBi), tris (8-hydroxyquinoline) aluminium (Alq) and the bis (1-(phenyl) isoquinoline) iridium (III) acetylanetonate [Ir (piq)2(acac)] doped into 4,4(-N,N)-dicarbazole-biphenyl (CBP) host, respectively. The devices were made of ITO/ m-MTDATA (40 nm)/ NPB (10 nm) /DPVBi (8 nm)/ CBP: Ir (piq)2(acac) x% 5nm/ Alq (50 nm )/ LiF (1 nm) / Al (200 nm). The electroluminescent (EL) spectra exhibit three peaks at 456, 520 and 620 nm, resulting in white light-emission with the Commission Internationale dEclairage (CIE) chromaticity coordinates of (0.37, 0.44) at 4V to (0.23, 0.30) at 13V when x is 4, while the device shows the current efficiency of 4.0 cd/A at 6V, and its maximum luminance is 21660 cd/m2 at 13V, respectively.
Design of UHVDC Wall Bushing and its Electric Field Simulation
Authors: Li Yu Mei , Ding Tao , He Qiu Dong
Published: August 2013

Reviewing and analyzing insulation mechanism of high voltage wall bushing, the structure of 1100kV UHVDC wall bushing and its key technical parameters are designed according to work conditions. Insulation structure and electric field of key bushing parts are simulated by ANSYS11.0. And the solution is optimized by SubProblem method based on the DC field theory. The result indicated that the parameters of designed solution could meet the needs of 1100kV UHVDC power transmission project.
Touch Screen Adjusting Light Design by Neuron Chip
Authors: Liu Hong Jun
Published: August 2013

Traditional lighting control gradually replaced by the intelligent lighting control. Based on Neuron chip tuning optical touch screen is based on the experimental platform to design and develop. This paper introduces how to apply Lon-works technology to develop the project's main technical process and the design method of software and hardware,including the necessary interface circuit and control program. It has been run and debug experiment, be good for lighting control and realized remote control.
Design of Wireless Data Transmission Module Based on ModBus Protocol
Authors: Ren Meng Meng , Ni Xiao Chang , Pang Bo , Li Tong , Song Zhen Ming
Published: August 2013

According to current technological situation that most of the existing Modbus networks are based on cable and the disadvantages of cable in bus architecture such as troubles during installation, much inconvenience in maintenance debugging and the potential safety hazard following high non-isolated, a design proposal based on Modbus digital transmission module is presented to realize the communication function without cable. During the design proposal, a wireless RF A7108 chip offered by SHENGKE electronic company is selected as the transmission carrier, which is followed by the transmit-receive pattern of Modbus protocol. And the transmission reliability of wireless data is guaranteed by the CRC check of every frame in the process of data transmission. This design can improve the problem of cable dependence in the traditional bus system and has a certain practical value within 500 meters radius in the industry with cable arrangement difficulty.
The Electromechanical Transient Simulation Study of the Short Current Current-Limiter
Authors: Qiao Jian , Liu Xiao Bo , Wei Jia Yu
Published: August 2013

With the expansion of the grid scale, the level of short-circuit current is significantly increased, we propose more stringent requirements to the grid. Limiting the short-circuit current is a problem to be solved.This paper used PSS/E to build the electromechanical transient simulation models of the SCCL device. We tested and checked the models by the system of IEEE 9 nodes 3 machines and concluded: In the current limiter parameters, the larger the inductor is,the better the effect of limiting current is. In the same resistance situation,the larger the inductance is, the better the effect of limiting current is, the smaller the short-circuit current value is.
An Adaptive Fir Filtering Based on Balanced Realization
Authors: Deng Zheng Hong , Dang Jian Guo , Li Ting Ting
Published: August 2013

Balanced realization is an attractive candidate to design state-space adaptive filter structure due to its least parameter sensitivity. In this paper, based on the balanced realization, an adaptive finite impulse response (FIR) filtering algorithm is proposed to minimize the output-error using the coefficients of the transfer function as the adaptive filter parameters. This algorithm is an internally balanced realization form and guarantees that the designed adaptive FIR filtering always minimizes the ratio of maximum-to-minimum eigenvalues of the Grammian matrices.
Research on Adaptive Unscented Kalman Filter for Integrated Navigation
Authors: Xu Tian Lai
Published: August 2013

The accuracy of filtering deteriorates in condition that a priori information used in unscented Kalman filter (UKF) does not accord with the actual conditions. To improve the accuracy of filtering when the noise statistical properties are not known exactly in navigational data fusion, an adaptive UKF is proposed. In the filtering process, the statistical parameters of unknown system noises are adjusted online if filtering abnormality exists. Simulation results show that the proposed algorithm increases the accuracy compared with the standard UKF algorithm for integrated navigation.
Calculating Method for the Leakage between Slipper and Swashplate in Spherical Swashplate Type Axial Piston Pump with Conical Cylinder
Authors: Chen Yong Qin , Wang Yang Shun
Published: August 2013

This paper takes the piston that has tapered rotor spherical axial swashplate as the research object, aiming to develop research of calculation of slipping shoe and the swashplate of the lubrication circular leakage. First , analyzing the structure of piston pump that is characterized by slipping shoe static pressure lubrication, Based on the continuum of fluid , component force of slipping shoe as well as the pressure force gives rise to equations in which the Annular aperture fluid thickness and leakage are taken into calculations. Through detailed deductive calculations, the specific algorithm formula is given. Taking a certain Aero fuel piston pump as an example for developing slipping shoe circular leakage volume that changing with the structural parameter simulation. An analysis with the simulation curve illustration proves that the algorithm is available to the pump, and it is valuable and reasonable for slipping structure as well as the design.
Study Progress on Grinding Surface Residual Stresses for Nano-Ceramic Coatings
Authors: Liu Wei Xiang
Published: August 2013

Nano-ceramic materials had high hardness and wear resistance. Combined with current technology and cost saving, nanostructured coatings technology were carried out, using HVOF ( high velocity oxygen fuel) or plasma spraying technique can obtain high quality ceramic coating on metal substrate. Ceramic coatings produced cracks in the grinding due to grinding surface residual stress. the coatings grinding surface residual stress of engineering ceramics have been researched, grinding surface residual stress in the nanostructured ceramic coatings are being researched. the researches in this field include grinding process modeling, abrasives and grinding parameters, grinding process monitoring and control and realization of the software, the grinding mechanism and grinding damage on the surface, grinding force prediction, on-line detection, grinding on nanocoating material is a multivariable complex process.
Grinding-Hardening Experiments and Grinding Force Analysis in Infeed External Grinding for 45 Steel
Authors: Han Zheng Tong , Yang Gang , Luo Hong Bo
Published: August 2013

The grind-hardening method suitable for external grinding is proposed in this paper and the experiments are carried out on MI432B grinding machine.The hardened layer of the workpiece with cut depth 0.3mm and speed 0.2 m/min is analyzed.The result indicates the metallurgical structure of the hardened layer is martensite and the top hardness value is 754 HV(about 620 HRC).At the same time,the grinding force,one of the most important factors of grind-hardening process is modeled, and the measurement method is provided with elastic core clampers.The measurement result shows that the values of both the tangential force and the normal force increase when the cut depth increases,and the top value is 146 N and 656 N with the cut depth value of 0.4 mm respectively.
Design of a New Internet of Things Storage Mailbox System
Authors: Huang Ke Wang
Published: August 2013

The paper focuses on design of the internet of things storage mailbox system. The system uses RFID technology and compatible one-dimensional barcode to shield the personal information of the sender and the recipient. It manages the authentication of the user, the parcel, the courier and the storage mailbox remotely. And sending and receiving the parcel is not face-to-face handover. The system monitors the process of sending and receiving so as to ensure that the parcel will be sent to the recipient accurately and efficiently. The use of the system will avoid malicious parcel and waste parcel appearing.
A New Method for Solving Boundary Value Problem of Composite Hermit Equations
Authors: Shi Jun Hua , Li Shun Chu , Wang Xiao Lin , Gui Dong Dong
Published: August 2013

The paper is devoted to studying the solution for boundary value problem of composite Hermit equations. Based on the obtained solution with similar structural formula, a new method which is called as Similar Constructive Method (shortened as SCM) was put forward for solving this type of boundary value problem. The SCM is a simply and practical method, which provides convenience for solving boundary value problems of composite differential equations.
An External Ballistics Fitting Method Based on the Support Vector Machine
Authors: Liu Zhong , An Jing Xin , Zhang Guo Dong
Published: August 2013

It is because of many reasons the trajectory calculated from the theoretical model and the actual trajectory have some error, so the experimental results on the theoretical trajectory must be corrected. In this paper, two degrees of freedom of particle trajectory equations are used to determine the ballistic coefficient. And a SVM Neural Network which has a great learning ability and generalization ability of the extremely small sample is used to adaptive learning the solver deviation of the fit between the trajectory and measured trajectory and amend the ballistic coefficient and modified theoretical trajectory solver results. The test shows that this method has a good precision and stability, and the algorithm can be simple programmed. And it has some value in engineering.
Coordination Degree Analysis of Real Estate Investment and the National Economy in China - Based on Principal Component Analysis Method
Authors: Ruan Lian Fa , Shen Long Jiang
Published: August 2013

Starting from six indicators like the ratio of the real estate investment growth and GDP growth etc., this article analyses the coordination degree of real estate investment and national economy with principal component analysis, and obtains the coordination index. Using 3σ method, the authors calculate the mean and standard deviation of the principal component indicator data, and then establish an early warning interval for real estate market . The results show that the real estate investment is a little excessive in recent years but the coordination degree between the real estate industry and the national economy is generally stable in China. Further investigations indicate that the change of the coordination index of the commercial housing sub-market is consistent with the whole commercial building market, but the one of the non-residential building is opposite to the total CB's.
Research on Predicted Model of Least Squares Support Vector Machine Based on Genetic Algorithm
Authors: Dong Huai Lin , Huang Juan Juan , Cai Zhu Hua , Wu Qing Feng
Published: August 2013

There is huge amount of data with complex uncertainty in the stock market. Meanwhile, efficient stock prediction is important in financial investment. This paper puts forward a classified and predicted model based on least squares support vector machine (LS-SVM) in the background of stock investment. This model preprocesses the input vector of stock indexes using the method of Wilcoxon symbols test and factor analysis, and determines the parameter of LS-SVM based on the genetic algorithm, after that classifies the stocks based on growth rate, then is trained using the stock sample. At last this paper verifies the model with the samples. It also presents a demo to predict the increasing trend of the stock. The result shows that this model owns favorable predicted ability with high correct classification rate.
An Out-of-Core Method for CFD Simulation in Heterogeneous Environment
Authors: Cao Wei , Wang Zheng Hua , Xu Chuan Fu
Published: August 2013

In recent years, the highly parallel graphics processing unit (GPU) is rapidly gaining maturity as a powerful engine for high performance computer. However, in most computational fluid dynamics (CFD) simulations, the computational capacity of CPU was ignored. In this paper, we propose a hybrid parallel programming model to utilize the computational capacity of both CPU and GPU. Considering the memory amount of CPU and GPU, we also propose an out-of-core method to increase the simulation scale on single node. The experiment results show that the programming model can utilize the computational capacity of both CPU and GPU efficiently and the out-of-core method can increase the simulation scale on single node.
The Adaboost Algorithm Applied in ATM Automatic Identification System
Authors: Zhang Ming Hui , Zhang Yao Yu
Published: August 2013

Seeing that human face features are unique, an increasing number of face recognition algorithms on existing ATM are proposed. Since face detection is a primary link of face recognition, our system adopts AdaBoost algorithm which is based on face detection. Experiment results demonstrated that the computing time of face detection using this algorithm is about 70ms, and the single and multiple human faces can be effectively measured under well environment, which meets the demand of the system.
A Method to get the Forward Kinematics of Parallel Kinematics Mechanisms Based on the Fixed Point Iteration
Authors: Han Xian Guo , Zhang Jun
Published: August 2013

The fixed point iteration method was proposed to solve the forward kinematics of parallel kinematics mechanisms as a new method. In every iteration through the reverse kinematics the previous iteration intermediate position and posture determined stick orientation vectors. And the stick ports, which were obtained by multiplying stick orientation vectors and given stick lengths, determined the next iteration intermediate position and posture. The final position and posture satisfying the convergence conditions would be obtained. 6-SPS was taken as an example to verify that this method was available and correct. Compared with the Newton iteration, this method possesses more advantages, such as simpler formula, higher speed of the convergence, smaller program workload, and less influence of initial values on the convergence.
Analysis of Iris Images Segmentation Methods Based on Level Set
Authors: Chen Ying , Yang Feng Yu
Published: August 2013

Iris recognition plays an important role in personal identification. In this study, we utilized CREASEG experimental platform to analyze the performance of some state-of-the-art image segmentation algorithms based on level set. Performance evaluation criteria include segmentation accuracy and computation time of pupil and iris localization. Four iris images were taken as experimental samples. The experimental results on those image samples demonstrate that Chan-Vese model achieve the best performance among all six algorithms. Furthermore, experimental results also show that energy functions play an important role, which should not make evolution curve to terminate at local minima or pass through the boundary. This study can provide certain referential significance in how to select image segmentation algorithm based on level set.
Study on Iris Segmentation Method Using Chan-Vese Model
Authors: Chen Ying , Yang Feng Yu
Published: August 2013

The first and critical step in the process of an iris recognition system is iris segmentation. Firstly, we detailedly describe the process of pupil and iris localization based on Chan-Vese model. Secondly, we describe the process of unwrapping iris annule region, and obtain rectangular image with the same width but different height. Thirdly, cut rectangular iris image to get normalized image. Fourthly, Multi-channel 2D Gabor, 1-D wavelets and zero-crossing methods were used to extract feature; consequently, decidability indexes of intra-class and inter-class were obtained. Finally, comparatively analyze the pros and cons of the proposed method. Three public iris images databases were taken as experimental samples, the experimental results on these image samples demonstrate that the proposed algorithm has certain advantage.
A Research on MapReduce-Based Redundancy Pruning for Record Linkage
Authors: Yang Feng Yu , Chen Ying
Published: August 2013

To improve efficiency for record linkage with keeping high recall, technique of multiple signatures that groups an object into several clusters have been applied in many domains. Thus leads to redundant comparisons for a pair of source and target object. Based on MapReduce model, we propose a redundancy pruning approach to prune redundant pairs before final similarity computation. Our approach is implemented on two consecutive MapReduce phase, and then is evaluated on 2 practical datasets and shows good pruning ability.
Research on the Construction of Personalized Active Information Service Model in Digital Library
Authors: Tang Kai
Published: August 2013

Based on study of users behaviors, interests, hobbies, professional fields and habits, personalized active information service in digital library is a kind of information service which takes the user's personalized needs as the center. Its key technologies includes user modeling technology, intelligent agent technology, ontology technology, Web data mining, personalized recommendation technology and information push technology etc. Based on the above technologies, this paper constructs a kind of multi-technology personalized active information service model, which can give full play to superiority of various technologies, and has the feature of intelligence. The model applies the technology of user modeling, ontology, intelligent agent, and draws on the general principle of personalized active information service, which is characterized by self-learning, self-renewal and other intelligent elements.
Research on Automated Forex Trading System Based on BP Neural Network
Authors: Meng Li , Sun Yang
Published: August 2013

This paper reports on an expert advisor for forex trading based on Back Propagation Neural Network (BPNN) in MetaTrader4 platform. A single hidden layer feedforward network was established for foreign exchange rate prediction. Trading rules based on the prediction results was designed and realized. Finally, we optimized the parameters according to the profitability performed on EUR/USD, GBP/USD currency pairs separately. The optimized results are able to achieve good results in the training series. In the test series, the strategies are consistently profitable for at least the first twenty days. It is concluded that the BPNN based model do have the ability to make profits from the experimental currency pairs for the period investigated.
A Multi-Level Knowledge Representation Technology Research in Oil Management System
Authors: Yuan Guo Ming , Fan Bo
Published: August 2013

Ontology combined with the development of computer technology in all fields initiated the research of construction and application for so-called domain ontology. This article starts with the issues of current computer technology in the oil exploration and development domain, provides a construction method of oil exploration and development domain ontology based on a multi-level business process,and divides the oil exploration and development domain into multistage business activity levels,and takes hydrocarbon prospect characterization as example and discusses a construction method for corresponding micro-ontology.