bluuebunny/crossref_metadata_2025 huggingface dataset:
Heat Transfer Enhancement of Staggered Ribbed Backward Facing Step Flow with Inclined Impinging Jet
Authors: Mushatet Khudheyer S.
Published: February 2012

In this paper, A numerical study has been done to predict the heat transfer of the staggered ribbed backward facing step flow with inclined impinging jet flow. The impinging jet flow was inclined towards the main cross flow and the angle of inclination is ranged from 30ْ to 90ْ . The ribs were in staggered arrangement and aligned after the slot jet in normal direction to the main cross flow. The effect of angle of inclination and contraction ratio on thermal field was studied for jet and channel Reynolds number of 20000 and 16000 respectively. The aim of the present study is to verify how adding staggered ribs with inclined jet flow to the problem of backward facing can enhance the rate of heat transfer. The governing partial differential equations of continuity, Navier-Stockes and energy was discretised on non-uniform staggered grid by using finite volume method. The discretised algebraic equations were solved by using a built home computer program based on simple algorithm. The conducted results show that the considered flow geometry increased noticeably the rate of heat transfer for the studied contraction ratios and angle of inclination. It was observed that the rate of heat transfer is decreased as angle of inclination increases.
An Image Enhancement Method Based on the Coal Mine Monitoring System
Authors: Wang Zhen Chong , Zhao Yan Qin
Published: February 2012

For the low illumination and low contrast in the coal mine, images captured from the video monitor system sometimes are not so clear to help the related personal monitoring the production and safety of the mine. According to the special environment of coal mine, an image enhancement method was presented. In this method the impulse noise which is the mainly noise in the coal mine was first reduced with median filtering, then the low contrast and illumination was greatly improved with the improved adaptive histogram equalization. Experiments show that this method can improve the quality of images underground effectively.
Parameter Optimization of High Pressure Water-Jet Target Detection
Authors: Yang Hong Tao , Zhang Wei , Chen Bin , Cai Chun Mei , Zhang Jing
Published: February 2012

In order to detect and locate the water-jet target by the reflected sound signal generated while high pressure water-jet impacted the target, a variety of relevant parameters should be optimized to make microphone acquiring the effective reflected sound signal. The basic principle of high pressure water-jet target detection theory and the parameters needed set were introduced. The experimental device was set up to acquire the reflected sound signal. The wavelet denoising and signal decomposition software was programmed by using MATLAB. The communication between LabVIEW and MATLAB was realized by calling the Math script node which processes the reflected sound signal denoising and decomposition. The optimal parameters are selected based on the voltage amplitude level and stability of the reflected sound signal eigenvalues on the mutation point which is produced on the edges of the target.
Multi-Temporal Analysis of Urbanization in Mountain Environment: a Case Study of Chongqing, China
Authors: Jiang Jing Dong , Huang Jing Nan , Tian Ling , Liu Yong
Published: February 2012

Urbanization in Southwest China, an extensive mountainous region, has been unprecedentedly rapid in the past two decades, particularly with the implementation of “Great West Development”. However, most present studies on urbanization of Chinese cities are limited to coastal area. Little is known about the urbanization pattern and underlying mechanism in this region. The main purpose of this research is to analyze the process of rapid urbanization and its impact on mountain environment, using Chongqing, the well known “mountain city” in China, as an example. Four time-series satellite images were employed to extract the landscape data. The result was assessed by several “landscape metrics”. The research also investigated how complex natural factors as well as socio-economic factors exerted influence on the urbanization. Based on examination of present landscape, a planning model which was believed suitable for mountain urban development was proposed.
Normalized Coupling Method for Multi Shafts Speed Synchronization
Authors: Zhao Bin , Gao Feng , Tian Lei
Published: February 2012

Multiple independent motor driving systems have been applied in various fields nowadays. The speed synchronization of multi motors became a challenge. A new normalized coupling method has been proposed. The simulation result shows the new method could apply on more than two motors. Both same speed and different speed synchronization can be achieved.
Optimal Control for Tractor Automatic Transmission Shift Process
Authors: Zhou Zhi Li , Ding Jin Quan , Xu Li You , Xing Ming Xing , Liu Yi Tao
Published: February 2012

This paper studies the structure and principle of tractor automatic mechanical transmission shift actuator with the type (electronically controlled hydraulic). Tractor AMT shift actuator mechanics model and mathematical model are set up. Dynamic analysis of shift process is finished. The method of solving contradiction between shift time and shift impact in shift process is presented. Through analysis of shift process, optimal hydraulic control law could be found out by applying optimal control theory. The most short time shift with low impact even no impact is realized.
Optimization and Realization of Target Tracking Algorithm Based on Embedded System
Authors: Sun Qi Yuan , Ma Lei , Cao Zuo Liang
Published: February 2012

Target tracking algorithm is used widely in many fields, such as robot vision system, intelligent surveillance and medicine, but computational complexity and lack of dedicated embedded system for real-time processing have affected its application. This paper presents a method that combines embedded system, smart camera and mobile robot for detecting and tracking the moving targets. On the basis of particle filter algorithm, mean shift embedded particle filter algorithm is proposed and implemented on embedded platform with ARM+DSP dual core framework. At last, the whole system is optimized to improve the real-time property. The proposed method has a very powerful data processing ability, which can offer a high reliability for the navigation of a mobile robot.
Three-Dimensional Seepage Analysis and Seepage Control System Optimization of a Hydropower Project
Authors: Zhan Wen Ting , Xu Qing
Published: February 2012

The study is conducted for the 3-D seepage field analysis and the seepage control measurements optimization of a hydropower project, which is located in Sichuan Province, China. The seepage control measurements are introduced in this paper. An equivalent method is adopted to simulate drainage holes and the approach of determining equivalent permeability coefficient is presented. The 3-D seepage field with seepage control system is analyzed comprehensively by the water head contours, uplift on the dam foundation, and so on. The necessities of setting the grouting curtain and the drainage holes are discussed respectively. Further the optimal design of the grouting curting and drainage holes of the dam foundation is studied. The results show that special attention should be paid to ensure the well-operation of the seepage control system and the optimization of decreasing the depth of the drainage curtains and grouting curtains properly can be considered.
Panoramic Image Browser Design Based on Cylindrical Surface
Authors: Yang Gang
Published: February 2012

After generating panorama, panoramic browser can display it.In order to develop the browser, Using glscene component developed in Delphi,which encapsulates functions of OpenGL and includes a set of base classes that develop quickly three-dimension graphics system, then putting forward an open format based on XML,which can prevent the display format from confining the data storage format,to show panoramic space of different systems in the brower,and hotspot principle is adopted to achieve different scene switch.
Analysis of Hydropower Project Financing Risk TOT Mode Using the CIM – AHP Mode — Nansha Hydropower Station in Yunnan as an Example
Authors: Chen Chen , Wang Song Jiang
Published: February 2012

TOT as a new project financing mode, its appearance effectively solves problems like the lack of government investment funds, management inefficiency and others. But because of its complex organizational structure involving more than one principal, the potential risk is enormous. In this paper, I use AHP method to conduct comprehensive and systematic risk identification for TOT projects and establish the control interval and memory (CIM) model to assess the risks of hydropower financing. The application of CIM in engineering practice shows the effectiveness and feasibility of CIM, the comprehensive evaluation method in the risk assessment.
The Influence of Supersonic Combustion when the Cavity Parameters Changed on the Chamber Wall
Authors: Gao Peng , Chang Xin Long , Gao Shuang Lin , Zhu Jie Tang
Published: February 2012

In this paper, the detail numerical simulations were performed on the flow field of the scramjet combustor chamber with the hydrogen fuel, when the cavity parameters changed. The research results indicate that the effect of gas and air mixing and flame stability are altered when the parameter of cavity changed. From the research we will better understand the supersonic combustion. The high efficiency flame stabilities can be designed in future.
Risk Analysis on Investment of Hydropower Project Based on WBS and RBS
Authors: Lin Lei , Wang Song Jiang
Published: February 2012

Based on the investment risk characteristics of large-scale hydropower project, the risk identification of investment for hydropower project is investigated according to the project Work Breakdown Structure(WBS) and Risk Breakdown Structure(RBS). The method for estimating the investment risk of hydropower project is applying Monte Carlo simulation technique. This method is applied to analyze the risk of the Hsin-an River hydropower project in the Zhejiang Province based on experts' experiences. Good result is attained.
The Development of Projects under the Clean Development Mechanism in China
Authors: Xu Shao Nan
Published: February 2012

Since 2005 when Carbon Fund was formally introduced to China, the development of projects under the clean development mechanism(CDM) has experienced enormous growth,contributing to the sustainable development of industry.While there are at least two general barriers to get a balanced development of CDM projects in China—namely the limitation of implementation of CDM projects both in sector and scale spheres and problems faced by enterprises in development of CDM project —for assessment of the applicability of project methodology，this article compares the national Chinese registered projects and corresponding methodologies in the world.In the end,My analysis argues the underlying reasons and proposes several schemes to solve the problems.
The Research of Radar Signal Interface Technology Based on LVDS
Authors: Su Gang , Zhang Jian Min
Published: February 2012

radar signal, LVDS interface，FPGA，noise and power consumption
Study on the Production and Properties of Mulberry Fiber
Authors: Tan Lei , Ma Yi Hua , Tian Lin , Li Ming , Liu Zheng Qin
Published: February 2012

The scoring process of mulberry fiber was studied in this paper, and through analyzing the impacts of scoring technological parameters to the degumming of mulberry fiber, finally, the optimum technological condition was determined. At the same time, the properties of the fiber were tested and studied.
Research of Frame Optimization Technology Based on SIMP
Authors: Huang Xue Tao , Gu Liang , Lv Wei Wei
Published: February 2012

The low frequency vibration of vehicle is very popular. The vibration can reduce ride comfort and cause early damage of part, so we must do something to reduce it. But the vibration has more complex impact factors, so it is very difficult to solve it. This paper has studied a new method to reduce it. It has studied the natural frequencies of the frame on the platform of OptiStruct software. Through the research, we find that the first order mode natural frequency of the frame is close to the external motivation, which is caused by moving unbalance of wheels. It leads to the resonance phenomenon, which is the main reason for vehicle low frequency vibration. In order to improve the vibration, this paper has researched the principle of SIMP topology optimization technology, and searched for the topology frame structure, whose first mode natural frequency is far away from the external motivation. Finally, this paper shows a new design for the frame, which reduces the low frequency vibration of vehicle greatly.
Quantitative Analysis on the Orthogonal Fluxgate
Authors: Li Ju Ping , Liu Shi Bin , Hou Xiao Wei , Yang Shang Lin
Published: February 2012

The mechanism of the orthogonal fluxgate is much more complex than that of the parallel fluxgate. Quantitative analysis on the orthogonal fluxgate has been seldom reported. In this paper, we analyzed the orthogonal fluxgate quantitatively. For an anisotropic soft magnetic material, the 3-D hybrid Jiles–Atherton/Stoner–Wohlfarth magnetic hysteresis model only provides semi-quantitative analysis. When the material of the senor is isotropic, a little modification was made on the 3-D hybrid Jiles–Atherton/Stoner–Wohlfarth magnetic hysteresis model, and the simulation after modification is more reasonable.
Rapid Determination of Organic Matter Fractions by Ozonation Chemiluminescence
Authors: Liu Yan , Fan Ping Ping , Hou Guang Li , Sun Ji Chang , Cheng Yan , Ma Ran
Published: February 2012

Understanding marine biogeochemistry requires a network of global ocean in situ monitoring of various parameters on different scales in time and space. Among the various parameters involved in marine biogeochemistry, sediment chemistry is most important, and the organic matter fractions are the dominate factor in this parameter. However, classical methods of determining organic matter fractions consume a great deal of time and labor. In addition, some of these methods can produce high levels of pollution and are therefore not suitable for in situ studies. This study explored a method of rapid determination of organic matter fractions by ozonation chemiluminescence. In this method, the organic matter was separated into extractives, acid soluble fractions and acid insoluble fractions (AIF) using the classical method and then oxidized by ozone. The ozonation chemiluminescence characteristics of eight samples were subsequently used to set up a model to predict the concentrations of organic matter fractions. The model was tested using nine other organic samples and the results showed that it provided a better fit for the predicted acid soluble fractions. This study is the first to demonstrate the use of ozonation chemiluminescence for rapid determination of organic matter fractions; however, further study is required to enable its universal use.
Research of Permanent Magnet Synchronous Motor Speed Control System Based on DSP
Authors: Wang Hui , Dong Xue Ren , Yang Xiao Wei , Liu Feng Nan
Published: February 2012

For requirements Permanent magnet synchronous motor (PMSM) speeds control, the digital signal processor (DSP) is used for speed control system of PMSM. By using space vector pulse width modulation (SVPWM) algorithm, system performance is improved, and system costs are reduced. In this paper, the principle of SVPWM is analyzed, and its implementation is described. Through the analysis of permanent magnet synchronous motor in a different coordinate system in the mathematical model system solution is presented, software design for system is described. A DSP-based PMSM speed control system is build, the system is analyzed in MATLAB simulation. That proves the feasibility of the system.
Research of the Open CNC System Based on PC and Programmable Multi Axes Controller
Authors: Yue Qiu Qin , Zhang Jin Chun , Yu Hua
Published: February 2012

The hardware and software structure of the open CNC system is researched and constructed based on the open PMAC. Moreover, the communication software of the system is designed to realize the .function of the open CNC system based on PC and PMAC. The open CNC system has strong flexibility and broad application by adopting this technology.
Separation of Antihypertensive Peptides Derived from Soybean Protein Isolated with Ultrafiltration Technology
Authors: Hu Shao Xin , Jiang Lian Zhou , Pan Yuan Yuan , Li Yang , Sui Xiao Nan
Published: February 2012

Antihypertensive peptides derived from soybean protein isolated were separated by ultrafiltration technology. The antihypertensive peptides was ultrafiltrated by the membrane with 1000 molecular weight cut-off. The effects of pressure, concentration，temperature and time during ultrafiltration were studied. In the experiment the method of response surface has been utilized to improve the ultrafiltrate film with 1000, and the best appropriate ultrafiltrate condition is that: ultrafitration pressure 0.38Mpa, PH value 6, the temperature 44°C, the time 100min. The analytical predictor of response surface under this ultrafiltration condition is 29.09912 L/(m2h), which has been verified in verification test.
A Sensor Data Query Method Based on Wavelet Synopsis
Authors: Liu Yue , Fu Chun Yan , Ge Mao Song , Wang Yong Li , Zhao Hua Qi
Published: February 2012

Accurately replying all queries of different users in Wireless Sensor Network is a challenging problem. The recent works solve this problem by approximate query based on sensor readings, For the need of precision, this model need to update frequently and the cost of communication increases very quickly. This paper proposes A sensor data query method based on wavelet synopsis, It constructs a wavelet synopsis in the process of data collecting, reduces the number of data, increases efficiency, reduces the communication cost.
Research on an Unmanned Automatic SMS Alarm System for Cooling Tower Fan
Authors: Chen Jian Ping , Li Hai Jun , Su Gui Yuan , Shi Xiao Kuan
Published: February 2012

SMS automatic alarm system monitors the operation parameters of the fan in real time mainly through PLC and sends the detected abnormal state before the accident to the PLC. SMS Monitor module receives the results of PLC treatment. Once the PLC sends alarm signal to start the SMS Monitor module and sends a warning message to the default person, the real-time dynamic can be inquired and disposed remotely through the interactive function of the module. This system builds distributed PLC control system on GSM business communications platform of China Mobile and China Unicom. The realization of PLC wireless data transmission has advantages such as utilizing existing networks, shortening the construction period, lowering construction costs. The easy installation and the simple maintenance of the equipment have great practical significance.
Research on Emissions of Benzene & Polycyclic Aromatic Hydrocarbons in Constant Volume Combustion Bomb
Authors: Liang Xiao Juan , Li Xi Qin
Published: February 2012

Polycyclic aromatic hydrocarbons are harmful to human body and environment. In order to know the formatting rules of benzene and polycyclic aromatic hydrocarbons in gasoline combustion process, a series of tests are done in a constant volume combustion bomb. The emissions of benzene and polycyclic aromatic hydrocarbons are measured by a gas chromatography-mass spectrometry analyzer. The test results show that the benzene in combustion products comes from the incomplete combustion fuel. The free radicals out of cracking fuel may also become benzene in combustion process. Adding ethanol in fuels does not necessarily increase the emission of benzene. Formation of polycyclic aromatic hydrocarbons varies with temperature.
Speech Evaluation System Based on MFCC
Authors: Wang Na
Published: February 2012

In order to evaluate the speaker's pronunciation quality, a speech evaluation system based on MFCC is designed by using some techniques including pre-processing, feature extraction and pattern matching and so on. The MFCC parameters of the standard speech and those of the original speech are extracted. The result is given by the mechanism. Experimental results show that the scores assessed by the system is relating to people’s subjective feeling closely. The software is developed by VC++ and runs on windows XP.
Research on Educational Resources Sharing Based on Internet of Things
Authors: Wang Xiang Zheng , Ge Yan Qiang
Published: February 2012

Internet of Things is a special concept of realizing intelligent sense, location, tracking, monitoring and management. It has been formally listed as one of five new large strategic industries. But because the construction of Internet of Things is still stay initial stage of research and exploration. Compared with the current internet, the Internet of Things has not only specific framework system, but also its concept, scope, technology system and standard are not clear. From above, based on grasping the definition, characteristics of the times and current situation of the Internet of Things and combining the connotation of educational resource sharing, this paper just talk over the application of the Internet of Things in education and study how to realize educational resource sharing better with the environment of the Internet of Things.
The Study of Purifying Coumarin Chemical Compounds in “Yubaizhi” Angelica Dahurica by Macro-Porous Absorption Resin
Authors: Wang Yan Long , Tang Hao Guo , Guo Mi Mi
Published: February 2012

The method of using macro-porous absorption resin to rurify coumarins in “Yubaizhi” angelica dahurica was used in this study. A kind of better resin was chosen from D-101 resin and HPD600 resin by the comparison of adsorption rate, desorption rate and purity. The result showed that D-101 resin was better for purifying coumrins. Then these conditions of purifying were discussed. when the sample concentration was 0.1g medicinal materials per milliliter and the adsorbent speed was 1ml/min, the effect of adsorption was better. And per gram resin could adsorb coumarins of 3g sample material. When the eluotropic speed of 80% ethanol was 1ml/min and the dosage of eluent reaches was 7 multiple of bed volume, the effect of elution was better. The result of demonstration test showed the effect of purifying coumarin was better with above-mentioned conditions.
The Calibration System of Gas Flow Meter Based on Standard Flow Meter Method
Authors: Ma Wen Tao , Bin Sun
Published: February 2012

Flow meter coefficient calibration system is designed and developed by the software of LabVIEW, hardware of PCI-6601 and USB-6008 from NI. Synchronous dual timer pulse interpolation is used to increase the calibration accuration of Standard flow meter method.It’s also necessary for system to collect the real-time temperature and pressure parameters to correct gas volume. The software complied by LabVIEW realizes functions of manage and data processing, the calculation and Storage of data, inverter control, report, data playback, and interactive interface. Results of experiments show that: compared to the routine standard flow meter method, the System has the more calibration accuracy and the less work time.
A Novel Transmit Diversity Technique for MIMO System
Authors: Zhang You Yan , Hong Shu Yue
Published: February 2012

The antenna diversity based on log-likelihood ratio (LLR) is better than that based on signal-to-noise ratio (SNR) in bit error rate performance for MIMO systems. Thus in this paper, we present a novel transmit antenna selection scheme based on bit log-likelihood ratio when the Alamouti code is employed .Then the BER expressions of application based on Bit-LLR (BLLR) for MPSK and MQAM modulation with Gray code are derived. The simulation results show that the new scheme based on BLLR is superior to SNR. With the increase of the transmit antennas, the performance of system is improved significantly. Furthermore, the diversity order is the same as that of the full complexity systems.
Accuracy Analysis of Centroid Detection Method Used to Star Sensor
Authors: Li Qi , Xu Wei , Xu Zhi Hai , Feng Hua Jun
Published: February 2012

Star sensor is important equipment for measuring satellite attitude and motion, and star centroid detection accuracy is the basis of the overall accuracy of star sensor. In star sensors, slightly- defocus method is often adopted to acquire dispersive light spots so as to facilitate centroid detection, and certain motion blur can also be introduced because of the motion of satellites. In this paper, we analyzed several commonly-used centroid detection algorithms by using simulation experiment to study the influence of defocus and motion parameters on the accuracy of centroid detection algorithm and provided acceptable parameter value ranges.
A Method for Part Analysis and Selection in the Renewal Process of Product Family Architecture
Authors: Lai Rong Shen , Hou Liang , Wang Hao Lun , Wu Yong Ming , Zhao Na
Published: February 2012

Aiming at selecting appropriate parts in the product family architecture for innovating, a method for part analysis and selection in the renewal process of product family architecture is initially proposed. On the basis of parts analysis from the three aspects of cost effectiveness-commonality, performance sensitivity and demand-matching degree, a coupling spatial model CSM is established. With the fuzzy c-means clustering method, the parts were clustered, and the choice domain and the improvement direction were pointed out. Finally, a case study of part analysis and selection in the working device product family of the wheel loader was presented to illustrate the validity of the method.
Application of PID Control Based on RBF Neural Network in Electro-Hydraulic Servo System for Steel Strip Deviation
Authors: Kou Xue Qin , Gu Li Chen
Published: February 2012

The working principle of the electrical-hydraulic servo system for steel strip deviation is introduced. The mathematical model of the system is established, and the performance indexes in time domain are analyzed with MATLAB. Aiming at the steel strip deviation, an improved PID control method based on RBF neural network is proposed. According to Jacobian information identification of RBF neural network combined with incremental PID algorithm, the self-tuning of parameters is implemented so that the performance of the system can achieve the designed requirements. Compared with traditional PID control, the simulation results show RBF- PID control has better dynamic performance and stabilization.
Agent-Based Simulation of Forest Firefighting
Authors: Chang Chun Yuan , Yang Chun Mei , Sun Xiao Fang
Published: February 2012

Forest fire fighting is very complex, the simulation using linear method is impossible. This paper proposed an Agent-based model for forest firefighting, designed the properties and behaviors of Fire Agent, Fighter Agent, and Commander Agent, simulated the fire spread and firefighting in forest by the three kinds of Agent’s actions, evolutions, and interactions; Developed the simulation software on Repast, which is composed of fire context, Agents, display, statistics and analysis etc; Simulated fighting with different number of Fighter Agent. The simulation’s statistics and analysis of Agents support both theory and practice for forest firefighting.
Application of Digital Phase Sensitive Detection for Electromagnetic Propagation Logging while Drilling
Authors: Liu Sheng Hu , Xing Ya Min
Published: February 2012

Intense electromagnetic interference while drilling prevents traditional analog phase sensitive detection (APSD) from correctly acquiring electromagnetic wave signal of logging while drilling (LWD). A digital phase sensitive detection (DPSD) utilizes high-performance floating-point DSP and FPGA to separately process real part and imaginary part of the acquired logging signal, changes traditional calculating method, improves processing speed and calculating precision. The programmable technique used can fully utilize logging information, simplify control logic, improve precision of timing control and measuring precision. Discussed are the principle, characteristics, implement of circuit and analysis of experimental data. Testing result shows that the DPSD may utilize logging information effectively and optimize the LWD system.
A New Method of Forward Index with Obtaining ID Automatically
Authors: Li Wei Jiang , Deng Hui , Chen Xing , Zhao Tie Jun , Yu Hong Yong
Published: February 2012

Classification and clustering of similar articles have gained a lot of importance in a time when we drown in information but are starved for knowledge. In this paper, we propose a novel index that uses termID obtained automatically to establish forward index. This method divides files by dictionary information of forward index and realizes the map between terms and files in order to establish efficient index. Later, if it were need to process information of term, it could only handle the corresponding documents.
An Approach to Lumbar Vertebra CT Image Segmentation Using Contourlet Transform and ANNs
Authors: Deng Jun Min , Li Hai Yun , Wu Hao
Published: February 2012

In this paper, we proposed a mathod for lumbar vertebra CT image segmentation based on the contourlet transform and artificial neural networks(ANNs). The proposed method consists of three portions. In the first part, contourlet transform is used to decompose the CT image to obtain the contourlet coefficients. In the second part, the self-organizing competitive artificial neural network is employed to optimize and extract the low frequency coefficients coefficients of contourlet transformation, reduce the number of coefficients greatly. The last part, the optimized coefficients are inverse contourlet transformed with the original coefficients,the segmented image is reconstructed. The experimental results show the accuracy of human lumbar vertebra CT image segmentation based on the proposed method is encouraged.
A SVM Model for Identifying Partial Discharge Based on TEV Data
Authors: Fei Jia Wei , Zeng Xiong Jie , Zhang Yi Wei , Wang Hong Wei , Zhang Jian Tong
Published: February 2012

Electric equipment breakdown is mainly caused by Partial Discharge (PD), so identification and diagnosis of PD are of great importance to the maintenance of electric equipment. This research analyzes the field TEV data of PD using SVM theory and establishes a model to detect and analyze PD, with related experiments verifying the validity of the model. According to the experience on site, we redesign the evaluation criteria and build a new model to guarantee that the identification rate reaches over 80%. The comparative experiment indicates that the SVM method proposed in this paper performs better on PD detection than BP Neural Network, laying foundation for further research.
A Fatigue Life Analysis Method Based on Nominal Stress Method and MSC.FATIGUE Software
Authors: Dong Da Shan , Lu Chun Yan , Teng Yuan Yuan
Published: February 2012

The paper is based on nominal stress method and MSC.FATIGUE software, adopts virtual fatigue design method, take cart balance beam of quayside container crane as an example, build its finite element model, conduct strength analysis on the balance beam and fatigue analysis under specified load course by MSC.Fatigue software, then obtain life distributions which can provide the basis of nichetargeting improvement and fatigue research in design stage. Through above analysis, it has been proved the feasibility of the method that the paper adopted, and it can greatly reduce the expense that the fatigue life testing brings about.
CNC Machining and Simulation for Relief of Special-Shaped Stone
Authors: Wu Yu Hou , You Hui Jie , Zhao De Hong , Liu Yan
Published: February 2012

Use special-shaped stone turn-milling machining center (HTM50200) to achieve the production of complex relief. Through the ArtCAM establish the three dimensional relief model of Riverside Scene at Qingming Festival. Analysis of blank material characteristics and features of NC machining center, select the appropriate tool, calculate cutting depth 、cutting speed 、feed rate 、spindle speed and other process parameters by formulas. With ArtCAM/CAM module to make process of the preparation of the rough finishing, the semi-finishing and finishing, and then generate the tool path file. Simulation in VERICUT can optimize the potential collision, over-cutting and owe cut of the machining process, and the adoption of special-shaped stone machining center for milling to finalize production of the relief, summarize the experience in special-shaped stone processing.
BP Neural Network Model for early Diagnosis of Kawasaki Disease
Authors: Huang Jiang , Chen Jian Feng
Published: February 2012

In order to diagnose Kawasaki Disease during early phase, clinical symptoms (temperature, rash, conjunctival injection, erythema of thelips, and oral mucosal changes) and laboratory data (white blood cell, neutrophil, platelet, high sensitive c-reactive protein, and erythrocyte sedimentation rate) of 138 children with Kawasaki disease or infectious diseases were used to develop a BP neural network model. 90 random cases were trained using MATLAB software for setting up the BP neural network model. The other 48 cases were analyzed to predict Kawasaki disease using this model. Results showed that the predict accuracy in patients with Kawasaki disease and children with infectious diseases are 95.6% and 88%, respectively. Our result indicates that the BP neural network model is likely to provide an accurate test for early diagnosis of Kawasaki disease.
A Image Transmission System Based on Logistic Map
Authors: Gang Zhang , He Li Fang , Zhang Tian Qi
Published: February 2012

A method for chaotic synchronization system based on nonlinear control was studied. The general approach to chaotic system is following Logistic map. First, the parameter which meets chaotic status was analyzed and found via bifurcation diagram and Lyapunov exponent spectrum. The system can be synchronized quickly after just only a single iteration. Then, the method of implementing the synchronization system within a chaotic parameter modulation based communication system was researched. The deduction and simulation results also showed the probability for implementation the system in fast secure chaotic communications that require instant synchronization schemes. Finally, the chaotic system was applied in image transmission and the simulation results were also given.
Design of Monitoring the PV-Wind Power System Based on King View
Authors: Zhou Hai Feng , Li Kai , Dong Jing De , Huang Yuan Qing
Published: February 2012

This paper set up high-quality and highly efficient automatic data collection and analysis system by King View configuration in order to improve the reliability and stability of PV-Wind power system monitoring and decrease the workload, the design of its functions, structure, interface, control strategy and system variables, protection, and so on are detailed. It uses configuration software based on PC to exploit the operation interface in host computer, and adopt Wide-Plus Intelligent Instrument as the lower computer to data-acquisition. It monitors and controls PV-Wind power System, acquires field data, deals with device faults in real-time
Design for a New Type of Powder Molding Equipment Based on Multibody Dynamics Simulation
Authors: Zheng Zhen Xing
Published: February 2012

A new compaction powder metallurgy equipment integrated with the mould and the frame is introduced to substitute the traditional powder metallurgy equipment (P/M). During the design and manufacture, finite element method is used to analyze the motion of the equipment. The Lagrange equation and modal synthesis method for flexible body are constructed, and then the cooperative simulation method using ADAMS and MARC is present for solving flexible multibody dynamics of flexible body. Results show that the design of the structure of the powder metallurgy equipment is feasible and the low cost and the simple structure are its merits compared to the traditional equipment.
Design of Data Acquisition and LED Display System
Authors: Zhou Hai Feng , Dong Jing De , Huang Yuan Qing
Published: February 2012

This paper set up a data acquisition system by AT89C52 single chip microcomputer as control core, using the RS-232 serial manner communicated with responsibled for data acquisition of microprocessor, and used LED to display. System can be divided into data acquisition module, serial communication module, control module, keyboard module, display module, etc. System of multi-channel data acquisition can be displayed in the LED after processed. The hardware circuit and software realized design functions :data acquisition and LED display.
Designing and Simulation of a Multi-Direction Tiny Force Switch
Authors: Huang Tao , Yang Zhuo Qing , Ding Gui Fu , Zhao Xiao Lin
Published: February 2012

This paper describes the designing and producing of a multi-direction tiny force switch, which is based on the technology of micro-surface processing on privative silicon. The switch is mainly formed by shore, overhanging spring, movable electrode and fixed electrode. Its’ structure material is Ni. The parameters of switch are confirmed by doing finite-element analysis with ANSYS. And rigidities of structure both on horizontal direction and vertical direction are analyzed by using ANSYS to ensure that the uniformity of switch rigidity is qualified. After producing the switch, the rigidity of switch is tested by using bonding tester. The test result shows that the rigidity is almost qualified with requirements.
Mitsubishi FA-Based Solar Photovoltaic Tracking Control System
Authors: Miao De Jun , Dai Yi Zong
Published: February 2012

A sort of two axes auto- tracking solar photovoltaic system based on Mitsubishi FA productions to solve the problem of low conversion efficiency in existing systems. It is discussed that how to design frames of input、control、execution 、functions and control strategies. The method of timing light intensity comparison is proposed to achieve automatic tracking of solar cells. This system can regulate automatically the horizontal angle and the vertical angle of the battery board by controlling circuits of sensors, plc, transducer and amplifier. Sound results are shown by tracking maximum conversion efficiency of this system.
Simulation Analysis of Tractor AMT Shifting Process Based on Fuzzy Optimization of Downshifting
Authors: Zhou Zhi Li , Xing Ming Xing , Xu Li You , Ding Jin Quan , Zhao Yan Ke
Published: February 2012

In this paper, the fuzzy control strategy is introduced, and then it proposes a two-dimensional fuzzy control method which takes the tractor driving wheel slip ratio and the engine throttle opening as input variables, while uses gear correction as output variable. Based on these, a fuzzy controller is designed to optimize the law of downshifting of tractor AMT. Subsequently, a best tractor AMT shift rule is formed through optimal combination of resolution obtained by the law of up-shifting. At last, simulation analysis is made on the basis of the simulation model established of tractor AMT shifting process. The results show that shift cycle can be effectively avoided and shift shock will reduced in the process of shifting, which makes the quality of shifting better and greatly improve the performance of the tractor.
Research on the Shape Distortions in Plastic Deformation Area for Narrow Plate Bending
Authors: Zhang Ling Yun , Zhang Rui , Zhang Bei Bei
Published: February 2012

In this paper, a research work on the shape distortion of commercial-purity aluminum narrow plates in the bending process was carried out. The bending process was simulated by using ABAQUS software in order to reveal the phenomenon and law of shape distortions in deformation area. A series of bending tests were conducted for the comparison of simulation results and test measurements. By measuring the variation of width under different conditions, the factors that affect distortion level were obtained, including position of layer, punch radius, section angle of observing point and initial width of plates. Reasonable agreement was achieved between the simulation and test results.
Research on Calculation Method of the Cutter Setting Angle in Screw Surface Form Milling
Authors: Tang Qian , Yan Di , Bi Yao Kun
Published: February 2012

The transition surface and the over-cutting phenomenon always appear in the screw surface form milling process which is based on the non instantaneous center envelope method. To solve this problem, an accurate calculation method of the cutter setting angle is proposed. The contact equation between cutter and workpiece is introduced. Spatial mathematical model is established according to the cutting tool profile calculation principle and the cutting mechanism. This method improves machining precision effectively, and can get the required screw surface. It also provides essential references for the design of form milling cutter.
An Experiment Study on Milling Forces in the Ultrasonic Milling of CFRP
Authors: Li Zhang Dong , Wang Xiao Bo , Zhao Bo
Published: February 2012

Carbon fiber reinforced plastics (CFRP) have been used widely in airplanes, spaceships, automobiles and sport equipment, etc. But the machining is very difficult due to the rigidity of its internal reinforced-phase. In order to settle the difficult machining problem of CFRP, ultrasonic vibration is introduced to common cutting. Through the experiment of common milling and ultrasonic milling of CFRP, the influences of different parameters on milling force are studied. The experimental results shows that the milling forces of ultrasonic milling are significantly lower than common milling using the same milling parameters. The processing vibration of ultrasonic milling is lesser and the process is more stable than the common milling.
Design of Missile Autopilot with Aerodynamic Lift and Reaction Jets Based on Auto Disturbance Rejection Controller
Authors: Yang Chong , Zhang Ke , Lu Mei Bai
Published: February 2012

First a new autopilot design model is presented for the interceptor missile with the blended aerodynamic lift and reaction jet. The reaction jet can improve the response speed, but the structure of control system becomes more complex. Therefore how to design control strategy properly is an urgent problem. Second, considering the discrete property of the lateral pulse jet thrusters and the continuous property of the aerodynamic fins, a kind of ADRC (active disturbance rejection control) autopilot system was designed for the aerodynamic lift/reaction jet missile. Finally, through a testing in the simulation of MATLAB, it is shown that, due to the sufficient utilization of the reaction jet, there is a significant improvement in the fast response and robust performance of the proposed controller. It is applicable to design the autopilot of aerodynamic lift and reaction jet blended missile.
Experimental Investigation on Cutting Forces and Temperature in High Speed Turning of Ti-5Al-2Sn-2Zr-4Mo-4Cr (Ti-17) Alloys
Authors: Wang Bao Lin , Ai Xing , Liu Zhan Qiang , Liu Ji Gang
Published: February 2012

In this study, orthogonal turning experiments are performed to analyze the machinability of Ti-5Al-2Sn-2Zr-4Mo-4Cr (Ti-17), a β-rich, α+β type alloy. PVD TiAlN coated carbide tool inserts are applied, because they are used widely for machining this material. The cutting forces and cutting temperatures are examined under different cutting conditions, which the cutting speeds are varied from 44m/min to 123m/min, the feed rates are 0.06mm/r, 0.08mm/r, 0.10mm/r and 0.12mm/r,respectively.There are some different varying trends of both the cutting force and the thrust force with the change of cutting speed. The cutting temperatures are found to increase with cutting speeds as well as feed rates.
Research on the Method to Decompose Propagation Sound Wave in Annular Duct
Authors: Liu Zhan Xin
Published: February 2012

There are many benchmark problems which have exact solutions or experiment data to gauge the simulation of aeroacoustic problems. Annular duct acoustic modes are good benchmark problems of this kind. The waves propagated along the duct can be considered as the summation of infinite Fourier modes. The energy relations of a single Fourier mode are deduced from governing equations in this paper. To investigate the properties of acoustic wave propagating along the duct, it’s necessary to decompose acoustic waves in the duct into multiple Fourier modes; the decomposition methods are presented.
The Optimization of Precision Milling Parameters for Titanium Based on Genetic Algorithm
Authors: Zhang Wen Sheng , Wang Hong Xiang , Du Hong , Xu Tao
Published: February 2012

The genetic algorithm converges faster compared with the traditional optimization algorithm, the global optimal solution can be quickly obtained and it is very effective for multi-peak function optimization. A milling process parameter optimization model is established for titanium based on genetic algorithm in this paper, the relevant constraints is considered and the optional titanium milling parameters is achieved based on the targets of maximum production efficiency and minimum cost, utilizing MATLAB optimization software to program, the best combination of cutting parameters is got finally. Experimental results show that the cutting efficiency and production costs are significantly improved with the optimized cutting parameters, so that the defects of low efficiency in CNC machining resulting in relying on experienced cutting parameters is overcome.
Reducing the Shrinkage Defects in the ZA27 Casting Alloy by Using Electric Pulse Current
Authors: Gao Ming , He Guan Hu , Huang Tao , Wang Chuan Yin , Yu Gui Ying
Published: February 2012

Electric pulse current (EPC) was employed to treat ZA27 alloy cast in the sand mould during the solidification. The experiment results indicated that the shrinkage cavity and the porosity in the ZA27 alloy was apparently reduced. And correspondingly, the mechanical properties of the castings were certainly improved. The current pulse applied in the initial stage of the solidification produced a better treatment result. The density of the casting ZA27 alloy treated with EPC in initial stage and later stage increased by 4.1 and 1.6 percent than that without EPC, respectively.
The Structure Optimization of Double Feeder System Core Components
Authors: Shen Xing Quan , Chen Zhen Ya , Pang Jun Zhong
Published: February 2012

The work investigates the structure parameters of adjustable subatmospheric pumping scraps device and oil feeder, which have extremely significant impacts on double feeder system in the deep-hole drilling process. Equations for subatmospheric zone pressure are derived herein using the siphon principle, and experiments are performed the trends of pressure on the single factor condition, which provide reasonable structure parameters for adjustable subatmospheric pumping scraps device. Oil feeder is studied based on the Euler column theory, and it can be optimized that is intermediate support, pilot bushing as well as sealing. The universal finite element software is used to design the structure of adjustable subatmospheric pumping scraps device and oil feeder, also reasonable structure design scheme of double feeder system core components is given.
The Ambulatory UV Light Soure Dry Curing Machine Designing
Authors: Han Lian Ying , Cheng Kai , Yan Li
Published: February 2012

A kind of ambulatory UV light source specific use inverter as the UV light source supporting power. Self-drive four machines running system, the wind turbine strengthen exhaust circulate cooling system。The objects are painted by light solid painting ,which keep still in situation.Accepting high-intensity UV light irradiation which is emitted by light curing machine to achieve the dry film coating. This machine is especially suitable for this kind object which is weight ,larger ,inconvenience delivery.It is ideal coating drying equipment for film covering coating light solid production process.