bluuebunny/crossref_metadata_2025 huggingface dataset:
Relationship on Flying Capacitor Multilevel Inverter Switching Loss Minimized PWM Method
Authors: Miao Chang Xin , Shi Li Ping , Li Gui Lin , Wang Hong Yan
Published: January 2012

The paper studies a switching loss minimized PWM method for flying capacitor multilevel inverter. Using the method, each phase of the flying capacitor multilevel inverter can have the 120° no switching zone in one period; according to power factor angle, 120° no switching zone can be adjusted to be farthest located in the centre of the peak value region of the load current, the switching loss can be greatly reduced and the efficiency of the system can be greatly improved. the simulation and experimental results show that switching loss of 33％is reduced.
A Harmonic Analysis for the Steady Analysis of Non-Linear Systems
Authors: Chai Shan , Liu Can Chang , Li Hong Yan
Published: January 2012

A numerical analysis is used to investigate the response of non-linear systems under aperiodic excitations based on the harmonic response analysis method. An idea of fine discretization is proposed to turn the aperiodic excitations into the superposition of a series of periodic excitations in a tiny time interval. The method of perturbation is employed to transform the non-linear governing equation into a series of linear differential equations. Harmonic response analysis can be applied in the solution of aperiodic steady response. The algebraic algorithm of direct steady-state analysis can improve computational efficiency. The defect that the steady-state solution can be gotten out until the free vibration attenuates is avoided. The examples show that the numerical results match well with the analytic data.
The Design of the Calculator System Based on ARM7TDMI Kernel
Authors: Guo Gai Zhi , Zhang Peng Ju , Yu Zong Zuo , Wang Hai Long , Ma Sen
Published: January 2012

A calculator design was created using S3C44B0X chip with ARM7TDMI as the kernel with a keypad connected to a ZLG7289A intelligent control chip through SIO synchronous serial ports as well as a LED port. The system design used hybrid programming with C language and ARM assembly language to accomplish basic calculations with LED digital display. The structured frame design makes it convenient to expand the functions of S3C44B0X, and has broad practical importance for developing uses for the built-in system both in software and hardware.
A Fully Integrated 5.2-GHz CMOS Variable Gain LNA for 802.11a WLAN
Authors: Duan Ji Hai , Kang Chun Lei
Published: January 2012

A fully integrated 5.2GHz variable gain low noise amplifier (VGLNA) in a 0.18μm CMOS process is proposed in this paper. The VGLAN can achieve a maximum small signal gain of 17.85 dB within the noise figure (NF) of 2.04 dB and a minimum gain of 2.04 dB with good input return loss. The LNA’s P1dB in the high gain mode is -17.5 dBm. The LAN consumes only 14.58 mW from a 1.8V power supply.
Queue System Based on GSM Modem and Single Chip Microcomputer’s Communication
Authors: Han Bo Ran , Liu Zheng , Zhou You , Zhou Kai
Published: January 2012

a new queue system based on Global System for Mobile Communications（GSM） modem and single chip microcomputer’s communication is proposed. This system can be connected to personal computer (PC), which will have interference superior to single chip microcomputer (SCM). The customers will be informed by SMS when their turn is around the corner. The viability and stability of this system is discussed hereinafter via debugging and testing.
The Design and Implementation of the Embedded System Based on ARM7
Authors: Zhang Zeng Ping , Li Shu Hua
Published: January 2012

An embedded application system must have Bootloader. It is introduced in this paper that the bootloader design for an embedded minimum system based on S3C44B0X that is a processor with ARM7TDMI kernel. The design of the bootloader includes coding file operating functions, designing MMI and implementing the start program used to initialize the portable embedded system and load the user code. The bootloader is tested and the result shows that the bootloader is stable and has high efficiency
Design and Implementation of FPGA-Based Digital PID Controller Using Distributed Arithmetic
Authors: Wang Xian Hai , Jia Jin Ling , Cheng Guang Jian , Zhang Hai Jun , Yu Wen Jun
Published: January 2012

This paper proposes a modularized method for the design and implementation of digital PID controller using DA algorithm based on Field Programmable Gate Array (FPGA) device. It is higher integration, lower power consumption, higher processing speed and more convenient reconfiguration compared with PID controllers based on software. The PID controller is modeled by using Simulink and DSP Builder to generate a system model. The controller coefficients are tuned conveniently by simulink and then pre-written into Look-up Tables(LUTs) in model of the proposed PID controller. After modeling, the simulation wave of step response for proposed PID controller is obtained easily by simulink. And the model of digital PID based on DA is then compiled by using Signal Compiler tool in DSP Builder provided by ALTERA corporation and synthesized by using QUARTUS II platform, and then the created file is downloaded into ALTERA’s FPGA device to implement the proposed PID controller.
The Finite Element Analysis of Thermal Property of High-Speed Spindle System in Vertical Machining Center
Authors: Sun Hong Mei , Wang Yan Zhong
Published: January 2012

The thermal property of the high-speed spindle system in vertical machining center was studied by using finite element method ( FEM ). When the spindle runs at the speed of 4300r/min, the system reaches the thermal steady state after 17 minutes, the temperature distribution in the spindle was symmetrical, and the highest temperature is in the inner ring the front bearing, with temperature rise of 36.7 .With the cutting force as load, The calculated result was taken as an input parameter in Abaqus software, the results of which show the thermal deformation of the spindle. The maximum thermal deformation of the spindle is 1.185 × 10-2 mm, on the shoulder, near the edge of the cutter.
Research on the Effect of Range Gate Pull-Off Jamming on the Tracking Radar and the Countermeasures
Authors: Luo Jin Liang , Shi Zi Sheng , Wang Xiao Nian
Published: January 2012

In this paper, the authors introduce the generation principle of the range gate pull-off (RGPO) jamming and its effect on the tracing radar, analyze the shortcomings of the countermeasures for the commonly-used existing anti-RGPO jamming, and finally gain a method to indentify if the radar suffers from the range gate pull-off jamming by integrating the characteristics of the range gate pull-off jamming, and propose the method of testing the variation of the radar-echo signal frequency-shift amount to eliminate the jamming.
Control Strategy for Vanadium Redox Battery Inverter in Islanding Microgrid
Authors: Zhou Feng , Wang Ke , Chen Jian Ye , Zhang Hua
Published: January 2012

Microgrid is one of the promising solutions to interconnecting the renewable energy in the form of Distributed Generation with the utility grid, where the inverter control strategy for battery is essential. In this paper, a dual-loop control strategy is proposed for Vanadium Redox Battery inverter in islanding mode. The dual-loop control strategy consists of an inner-loop current control and an outer-loop voltage control, both of which adopt the classical PI controller. Further, the strategy applied in transient mode is also discussed. The proposed dual-loop control strategy has been tested in MATLAB/Simulink simulations and experimentally on a laboratory-scale system.
Probabilistic Life Models in Rolling Contact Fatigue
Authors: Ghalme Sachin G.
Published: January 2012

Rolling contact fatigue (RCF) is the name given to crack growth and material damage generated as a result of high loads transmitted between two surfaces which are rolling with relative to each other. An understanding of rolling contact fatigue failure mechanism and a prediction of lifetimes are of interest to both manufacturer and researcher. Subsurface originated cracks have been recognized as one of the main modes of failure for rolling contact fatigue (RCF) of bearings. Numbers of investigators have attempted to determine the physical mechanism involved in rolling contact fatigue of bearings and proposed models to predict their fatigue lives. This paper attempts to cover the most widely used probabilistic life models used in RCF.
Rack-Aware Architecture for Reliable Cloud Systems
Authors: Huang Zhen , Yuan Yuan , Peng Yu Xing
Published: January 2012

The ever-growing demand on information and data requires the efficient architecture for large-scale network storage systems. To serve very large scale applications, using inexpensive commodity becomes the common selection in nowadays cloud storage systems. Based on such unreliable hardware, building fault-tolerant mechanism is key issue to the system design. In this paper, we propose a rack-aware architecture for cloud storage systems.
Determination of the Optimal Number of Suppliers Considering the Risk: Emersun Company as a Case Study
Authors: Mirahmadi Nasim , Saberi Esmaeel , Teimoury Ebrahim
Published: January 2012

Determining the number of suppliers chosen for cooperation in a supply chain is one of the most important problems in the supply chain management area. Regarding the fact that simultaneously decreasing the risk and cost is one of the most important objectives of every organization, besides the cost, the risk has also been introduced in the recent researches, as one of the most important criteria. In this paper, the decision tree approach is used for determining the optimal number of suppliers considering the supply risk and it has been tried to develop an applied method through expanding the cost criteria. The proposed model in this paper, therefore, contains any kind of cost ingredients such as cost of suppliers development, cost of suppliers management, cost of missing discount in volume due to increase in number of suppliers in supply base, and loss cost due to supply postponement from suppliers. This approach is implemented in Emersun Company.
Highway Traffic Accident Prediction Based on SVR Trained by Genetic Algorithm
Authors: Yang Zhen Qi
Published: January 2012

The multi researches and experiments show that the future highway traffic accident situation is shown by the highway traffic accident prediction. In the paper, support vector regression trained by genetic algorithm is presented in highway traffic accident prediction. In the method, genetic algorithm is used to train the parameters of support vector regression. Firstly, the regression function of support vector regression algorithm is introduced, and the parameters of support vector regression are optimized by genetic algorithm. The computation results between G-SVR and SVR can indicate that the prediction ability for highway traffic accidents of G-SVR is better than that of SVR absolutely.
Research on Virtual Operating System of Hydraulic Support Based on Virtools
Authors: Gong Ming , Wang Jian Wu , Li Bing Wen
Published: January 2012

The aim of the system is to standardize coal miners’ safety behavior and reduce the occurrence of the accident. The paper introduces the overall design of the system and detailed analysis of the structure. All the models are built in 3D software for virtools4.0. The combination of the modules in virtools4.0 and scripts realize the function of each component. The control box based on PLC is developed on our own. The system provides the training miners with a realistic virtual environment through the virtual operating platform and hardware equipments. Compared to the traditional training methods, this system has great significance for improving the quality of training.
Finite Element Analysis and Testing of Ladle Turret’s Supporting Arm
Authors: Guan Li Kun , Zhang Xin Yu
Published: January 2012

Objective: To establish a finite element model for ladle turret’s supporting arm. Verify the accuracy of finite element analysis, and accurate information cause of crack. Methods: Use ANSYS finite element analysis software to perform a solution of the supporting arm at loaded full ladle . By mean of strain measuements ,impact coefficient was obtained,and presents an analytical study of static strength of the supporting arm. Result:The greater the load is, the smaller the impact factor is. Verify the accuracy of the finite element method by on-site response test. Accordingly, it improves the supporting arm on the structure by effective basis.
Social Security Video Surveillance Systems
Authors: Lin Mao , Wang Yong , Shi Gang
Published: January 2012

the reform and open policy has brought us Chinese people rich and colorful. However, the disparity between the rich and poor gap are increasing due to the uneven development in Chinese economic so that state of social security become more and more terrible than the pass. Thus, it is very meaningful to establish a social security video surveillance system to achieve security linkage management by this way that monitors the important insecure point by installing one or more camera to capturing the situation real-time. When there is something happen, the monitoring center will cause an alert signal to administer for further processing. In this paper, we present a scheme to achieve the social security requirement.
Low Wave Number Radar Image Energy Influence on Determining Current
Authors: Yuan Gan Nan , Jia Rui Cai , Dai Yun Tao , Li Ying
Published: January 2012

In the radar imaging mechanism different phenomena are present, as a result the radar image is not a direct representation of the sea state. In analyzing radar image spectra, it can be realized that all of these phenomena produce distortions in the wave spectrum. The main effects are more energy for very low frequencies. This work investigates the structure of the sea clutter spectrum, and analysis the low wave number energy influence on determining sea surface current. Then the radar measure current is validated by experiments. By comparing with the in situ data, we know that the radar results reversed by image spectrum without low wave number spectrum have high precision. The low wave number energy influent determining current seriously.
Estimating the Threading Dislocation Density of Thick GaN Films
Authors: Wang Ru , Zhang Jun Ling , Yang Rui Xia , Zhang Xiu Jun
Published: January 2012

The threading dislocation density (TDD) of thick GaN films grown by hydride vapor phase epitaxy (HVPE) was estimated through counting etch pit density (EPD) and calculating full width at half maximum（FWHM）of double crystal X-Ray diffraction (DCXRD). TDD was about 108 through counting EPD, while it was about 109 through calculating the FWHMs of (0002) and (1012). The experiment results show that the two methods are both suited to estimating the TDD of the thick HVPE-GaN films with 350um thickness. But they have some difference: EPD method is fitter in evaluating the dislocation density of the surface of thick GaN film, but FWHM method can gain the total dislocation density of thick GaN film. The method calculating the FWHMs possesses more general statistical significance.
Non-Characteristic Harmonics Analysis of HVDC System Based on Expansion Prony Algorithm
Authors: Ha Heng Xu , Hu Xi Tong , Sun Gang
Published: January 2012

With the widely use of the non-linear elements, the unreasonable parameters setting or interruption to HVDC system, converting stations may produce a kind of non-characteristic harmonics. In order to study its impact to the system, traits of these harmonics are analyzed based on the power system simulation tool—EMTDC. Contents and amplitudes of the harmonics in the DC line are detected by the expansion Prony algorithm, after that a basic analysis is given. Analysis of non-characteristic harmonics on the DC line is helpful to study the harmonic losses, the influence to electrical equipments and power qualities, especially to the design of the DC filters in HVDC system.
Research and Implementation of Monitoring Application Systems
Authors: Qu Feng Juan , Liu Li Yuan , Wang Huan
Published: January 2012

Business systems are widely used in various fields, to ensure high reliability, high operation efficiency and maintenance and initiative of the systems based on databases, this paper researches and submits a solution of monitoring and managing business systems to monitor and manage critical state of business systems.
An Improved Harris Corner Detection Algorithm for Noised Images
Authors: Zhang Xin , Ji Xiu Hua
Published: January 2012

The Harris corner detection algorithm is widely applied in image mosaic, which is simple and stable. However, the algorithm has a disadvantage that it obtains a lot of false corners when there exist some noise in an image. An improved Harris corner detection algorithm is proposed in this paper. The new algorithm reduces the noise impact greatly. The experimental results show that the improved algorithm not only reduces false corner points greatly, but also retain the majority of true corners. As a result, it improves the detection accuracy and reduces the chance of error matching in image registration.
Vibration Platform Remote Monitoring System Based on LabVIEW
Authors: Wang Xin
Published: January 2012

Vibration platform remote monitoring testing system, drived by tri-linear motor, makes use of PID Control Toolkit in LabVIEW to control the linear motor. It also uses a DAQ card named PCI 6229 from NI Company to capture digital signal from the motor encoder and collect the analog signals from the force sensor as well as output the driver signal of motor. Data Socket technology was used to achieve the remote motor control and data transmission.
Analysis of 3-D Numerical Simulation for Soil Cutting by Small Agricultural Machinery
Authors: Zhong Jiang , Zhang Xian , Jiang Jian Dong , Zhao Zhang Feng
Published: January 2012

Small agricultural machinery with forward and reverse-rotational rotary blades was proposed for solving the problem of cultivation with compacted soil. Lagrangian smoothed particle hydrodynamics (SPH) based models of forward and reverse-rotational rotary blades were carried out using the LS-DYNA software. SPH is a mesh free method, thus large material distortions that occur in the soil cutting problem are easily managed. In most earth moving machinery, such as bulldozers or tillage tools, the working tool is a blade. Hence for tillage systems, accurately predicting the forces acting on the blade is of prime importance in helping to enhance productivity. Structural parameters of reverse-rotational rotary blade were studied and optimized with orthogonal test and numerical simulating technology. Results show that forward and reverse-rotational rotary tool can independently work for the cutting of compacted soil with different operating resistance. It is perfectly feasible to apply the proposed composite rotary tiller to compacted soil deep-tilling with low power motor. Proper structural parameters of forward and reverse-rotational rotary blades can reduce the power consumption. This method provides theoretical basis for the design of tools.
Quantized Feedback Control under Dynamic Logarithmic Quantization Schemes
Authors: Liu Qing Quan
Published: January 2012

This paper addresses the quantized feedback stabilization problem for networked control systems with unbounded process disturbance, where sensors, controllers and plants are connected by digital communication channels. A dynamic logarithmic quantization policy is proposed to stabilize the unstable plant. It is derived that the quantization policy can maintain stabilization in the presence of unbounded and possibly non-Gaussian process disturbance. Simulation results show the validity of the proposed scheme.
Research on Fault Diagnosis Method Based on Empirical Mode Decomposition & Time-Frequency Reassignment
Authors: Hao Zhi Hua , Ma Zhuang , Zhou Hao Miao
Published: January 2012

The reassignment method is a technique for sharpening a time-frequency representation by mapping the data to time-frequency coordinates that are nearer to the true region of support of the analyzed signal. The reassignment method has been proved to produce a better localization of the signal components and improve the readability of the time-frequency representation by concentrating its energy at a center of gravity. But there are still few cross-terms. Then, the empirical mode decomposition is introduced to the reassignment method to suppress the interference of the cross-term encountered in processing the multi-component signals. The multi-component signal can be decomposed into a finite number intrinsic mode function by using EMD. Then, the reassignment method can be calculated for each of the intrinsic mode function. Simulation analysis is presented to show that this method can improve the localization of time-frequency representation and reduce the cross terms. The vibration signals measured from diesel engine in the stage of deflagrate were analyzed with the reassignment method. Experimental results indicate that this method has good potential in mechanical fault feature extraction.
Motor Position Detection Unit for Servo Control Application
Authors: Song Shu Zhong , Shi Jing Zhuo
Published: January 2012

Rotor position detection is important for motor servo system design. In general, there are two kinds of methods to obtain the position information in real time, sensor or sensorless methods. The sensor methods use position sensors such as optical encoder. This will greatly increase the cost of the system, and the sensor with high precision is difficult to be installed. On the other hand, the sensorless method can reduce the cost, but the reliability and complexity of the algorithm is still the problems. In this paper, a new low-cost integrated position detection unit, which is composed of the integrated position sensor, signal processing hardware and software, is described. The sensor is easy to manufacture and has better precision with the help of signal processing circuit and software based on DSP. The sensor can obtain absolute rotating angle using inductance detection method, and it is originally designed and used for a 2-phase hybrid stepping motor position servo system. Even though the feedback unit is originally designed for a 2-phase hybrid stepping motor, the same unit also can be used with other types of motors.
Soot Concentration Remote Monitoring System Based on GPRS and CAN Bus
Authors: Zhao Yan Jun , Bai Cheng Yuan , Qu Bin
Published: January 2012

Along with the development of the computer and communication technique, the remote monitoring system is widely applied. The pollution source is distributed widely, so the pollution status is difficult to monitoring. The soot concentration remote monitoring system based on GPRS and CAN bus is introduced in the paper. The system adopts the transmission-scattering method to measure the soot concentration. The measurement data is collected by the MCU and sent to the management system through the CAN bus. The data is sent to the EPA through GPRS. The experiment result indicates that the remote monitoring system can on-line measures the soot concentration and improves the communication efficiency and accuracy.
Application of MMAS and Rough Sets in Compound-Fault Diagnosis of Bearing
Authors: Kang Hai Ying , Shen Ren Fa , Qi Yan Jie , Yan Wen , Zheng Hai Qi
Published: January 2012

The diagnosis of compound-fault is always a difficult point, and there is not an effective method in equipment diagnosis field. Rough set theory is a relatively new soft computing tool to deal with vagueness and uncertainty. Condition attribute reduce algorithm is the key point of rough set research. However, it has been proved that finding the best reduction is the NP-hard problem. For the purpose of getting the reduction of systems effectively, an improved algorithm is put forward. The worst Fisher criterion was adopted as heuristic information to improve the searching efficiency and Max-Min Ant System was selected. Simplify the fault diagnosis decision table, then clear and concise decision rules can be obtained by rough sets theory. This method raises the accuracy and efficiency of fault diagnosis of bearing greatly.
Establishment of Cutting Tools’ Processing Angle Model in Whirling Milling
Authors: Guo Qin , Wang Yu Lin , Feng Hu Tian , Li Ying
Published: January 2012

The productivity of whirlwind milling is 3-4 times more than that of ordinary milling and grinding. Considering that the tool numbers are always 6-12, the problems caused by tools wear are becoming the difficulties in whirlwind milling. According to the actual processing, the rotary surface equation of cutting tools is established by the space coordinates, and then the equations of tool processing angels are derived. By changing the parameters in the equations, the model lays good foundation for improving and compensating methods to achieve the high precision surface.
Analysis of the Coupling of Heat and Moisture of the Soil under Circulating Action of Temperature
Authors: Zhou Dong , Ou Xiao Duo , Wang Li Ming , Yue Guan Yong
Published: January 2012

This article has used the equations of coupled heat-moisture anisothermal flow of the unsaturated soil, and conducted the numerical simulation coupling of heat and humidity by FLAC. By comparing the calculation result with the test result, it shows that the calculation result is close to the experiment result. The error is tending to be larger as the depth of the soil adds. The maximum error between the calculation and the experiment result is 1°C, and the smallest one is 0.1°C. Moreover due to the hysteresis of the heat transfer in the soil, the middle of the soil occurs temperature concentration phenomenon; Their trends of water migration variation are similar as the depth of the soil adds. The model of the coupling of heat and moisture is able to better simulate the change of heat and moisture of the soil under circulating action of temperature.
Experimental Research of Visual Performance with Differenet Optical Spectrum Light Sources
Authors: Yan Yong Hong , Guan Yang , Tang G. Lee
Published: January 2012

In order to determine the effect of different light source’s spectrum to a subjects’ visual performance, this experiment examined three fluorescent lamps with a colour temperature of 2700K, 4000K and 6500K and an incandescent lamp. The results were compared to the average recognition rate a “reference person” from different light sources. Experimental results show significant differences in the recognition rate from different optical spectrum light source and recognition rate value. We determined the best combination of ambient and chalkboard light source and propose avoiding combination for classroom lighting that is clearly inferior. This article provides selection reference for optimal classroom ambient and blackboard lighting. In recent years, the study of psychological and physiological effect of light has become one of the most important field in lighting research[1]. Studies has shown that different light spectrum could affect human circadian rhythm, body temperature and alertness, which directly affecting work efficiency and health[2]. The effects by classroom light spectrum on efficiency and health cannot be ignored, as the students are exposed to one particular lighting environment for extended periods of time. Through a systematic survey of classroom lighting in several universities in Chongqing and Chengdu, T5 fluorescent of high colour temperature about 6500K was the predominant choice for classroom general lighting as well as blackboard lighting. Many students complained that they tired easily at this colour temperature. In another study on classroom light source[3] students’ preference for colour temperature is not fixed but varies according to classroom’s function and illuminance level. It was insufficient to choose colour temperature of classroom lighting based on the results of the above questionnaire. We therefore chose and compared T5 fluorescent lamps of 2700K, 4000K and 6500K colour temperature on the visual performance and their effects on study efficiency, asthenopia and physiological rhythm. Due to space limitations this article only discusses the contrast experiment of visual performance.
Research on the Migration of Naphthalene in the Typical Aquifer Medium in a Petroleum Contaminated Field
Authors: Qin Yu , Li Zhe , Li Lin Lin , Kang Chun Li , Xue Hong Hai , Peng Fei , Lin Xue Yu
Published: January 2012

Through the column simulation experiments, this paper researched on the naphthalene migration in the typical aquifer media-gravel sand and coarse sand in a petroleum contaminated field. The research also quantified the retardation of the two medium to the important petroleum component-naphthalene, by giving the retardation parameter after the chlorine breakthrough experiment. The results showed that the migration of naphthalene in the medium is not only influenced by the convection and the dispersion, but also the adsorption and the biodegradation, which is much stronger in the coarse sand than it is in the gravel sand.
A New Method of Harmonic Detection Based on Auxiliary Tools
Authors: Wang Song , Liu Ming Guang , Li De He , Wang Hong Rui
Published: January 2012

In power systems there are many non-linear loads, the resulting harmonics on the power quality can cause great impact to the power system. Thus it is important to monitor and analyze harmonics generated by these equipments in order to get a better power quality. In this paper, we firstly analysis the theoretical foundation of the harmonic measurement. Secondly, by use of the experimental data received from oscilloscope, we calculate and analyze the harmonic currents by using the tool of FFT in MATLAB. The method is of universal applicability, particularly compared with the expensive power analyzing equipments, which may be a good alternative.
Method of Determining Vehicle Powertrain Parameter’s Weighting Coefficient Based on Rough Set Theory
Authors: Lu Hong Ze , Zhang Fu Jun , Zhao Chang Lu
Published: January 2012

In tracked vehicle powertrain integrated designing, rough set theory is applied to determine the parameter’s weighting coefficient on the vehicle 0-32km/h acceleration time. An example of three factors including the shape of engine external characteristic curve, the front gear ratio and shift schedule is given which shows that the method is simple, objective and effective.
Research for On-Line Measurement of Optical Fiber Diameter Based on Machine Vision
Authors: Yang Yuan , Geng Tao , Li Peng , Yang Wen Lei
Published: January 2012

Special optical fiber (D-type optical fiber) geometry parameter directly effect its sensing characteristics, it is very important to measure optical fiber diameter. But the present methods of measuring optical fiber diameter have some disadvantages, such as demanding high level environment and not real-time on-line measuring. This paper describes a method by applying machine vision technology to measure optical fiber diameter in real-time on-line. Firstly, Automatic Focusing System can collect clear fiber image by applying CMOS camera. Secondly, image edge was detected by using edge detector. And the precise location of image was detected by sub-pixel location technology based on gray moments. Lastly, optical fiber diameter is calculated by applying the two priority methods-least beeline fitting method. Experimental results show that the accuracy of measuring fiber diameter system is 1μm, and meet the requirements of real-time on-line measuring.
Distribution of Stray Current in Buried Pipeline
Authors: Zhu Qing Jun , Cao Alin , Song Ji Wen , Chen Sheng Li
Published: January 2012

Electrochemical corrosion happens when stray currents leak out of buried pipeline. This will threaten the safety of pipeline operation and operators. The distribution of stray current was studied by simulation system. The results indicate that stray current intensities have the same distribution with potential gradient Esx which parallel to the metallic pipeline. The distribution curves of stray current show regular symmetry. The stray currents increase gradually along the buried metallic pipeline. It reaches maximum at the pipeline midpoint. The potential gradient Esy distribution curves in y-direction show a hyperbolic shape. For the exits of faradic electric field, stray current intensity is maximum in the beginning and it flows into the pipeline. It flow along the pipeline and parallel to the pipeline at middle. After that, the stray currents begin to flow back to cathode and the stray current intensity reaches maximum at the end of pipeline.
Study on Tracking of Moving Object in Intelligent Video Surveillance System
Authors: Cheng Ping Guang , Yong Jian Hua
Published: January 2012

Through the in-depth study of the current motion detection and tracking technologies, combined with the practical application of intelligent video surveillance, this paper improves the existing motion detection and tracking algorithm. The improved algorithm continues the characteristics of original algorithm such as simple to implement and lower computational complexity, increases its range of application, and improves the anti-jamming capability and robustness of video tracking.
Evolutionary Techniques for Mobile Robot Navigation
Authors: Yun Soh Chin , Parasuraman S. , Ganapathy Velappa
Published: January 2012

Current research trend in mobile robot is to build intelligent and autonomous systems that enables mobile robot to plan its motion in static and dynamic environment. In this paper, Genetic Algorithm (GA) is utilized to come out with an algorithm that enables the mobile robot to move from the starting position to the desired goal without colliding with any of the obstacles in the environment. The proposed navigation technique is capable of re-planning new optimum collision free path in the event of mobile robot encountering dynamic obstacles. The method is verified using MATLAB simulation and validated by Team AmigoBotTM robot. The results obtained from MATLAB simulation and real time implementation are discussed at the end of the paper.
Effect of Blank Holder Force with Low Frequency Vibration Technique in Circular-Cup Deep-Drawing Using AZ31 Magnesium Alloy Sheet
Authors: Horiike Naoki , Yoshihara Shoichiro , Tsuji Yoshitaka , Okude Yusuke
Published: January 2012

In the deep-drawing process, the application of low-frequency vibration to the blank material has recently been focused on with the aim of improving the friction performance between the die and the blank material. A servo-controlled press machine is suitable for applying low-frequency vibration to the blank during the deep-drawing process, because the punch speed and blank holder force (BHF) are easily controlled as process parameters by using the servo motors. In this study, a BHF with low-frequency vibration was proposed as a technique for improving deep-drawability, which is mainly affected by the friction performance and the lubricant condition. We found that the friction performance between the blank surface and the blank holder was decreased in the case of a BHF with low-frequency vibration since the lubricating oil rapidly flowed into the clearance during the forming process. Furthermore, for a BHF with low-frequency vibration, the punch force and the deformation resistance were lower than those in a deep-drawing test without low-frequency vibration.
Dynamical Systems Framework for Service Robot Navigation Using Bond Graphs
Authors: Veera Ragavan S. , Ganapathy Velappa , Kuppan Chetty R.M.
Published: January 2012

This paper employs a Dynamical Systems Approach to a Wheeled Mobile Robot (WMR) Locomotion problem using an extended Bond Graph model. Bond Graph model of a WMR and its subsystems have been developed and the model and subsystems are validated using 20-Sim Simulation environment. The developed model provides a stable and computationally less intensive framework that can be deployed on resource constrained embedded devices for path planning, navigation and formation modeling.
Application of PID Frequency Conversion Technique in Pump Stations of Oilfield
Authors: Zhang Ya Sheng , Chen Shou Xin , Liu Jie , Xie Guo Ying , Zhang Ling
Published: January 2012

This article is a brief introduction of the successful way to improve pumps’ efficiency, reduce electricity consumption and cost of water supply by applying PID frequency conversion technique in water-supply centrifugal pumps of Huabei Oilfield.
An Innovative Eigenvalue Problem Solver by Using Adomian Decomposition Approach
Authors: Hsu Jung Chang , Chu Shao Shu
Published: January 2012

The paper deals with eigenvalues and normalized eigenfunctions for a Strum-Liouville eigenvalue problem. The technique we have used is based on applying a Adomian decomposition method (ADM) to our eigenvalue problems. Doing some simple mathematical operations on the method, we can obtain ith eigenvalues and eigenfunctions one at a time. The computed results agree well with those analytical results given in the literature.
Research and Application of Web-Based 3D Visualization of Monitoring over Materials Haulage to Dam
Authors: Cui Bo , Zhong Deng Hua , Zhong Gui Liang
Published: January 2012

The aim of web-based 3D visualization of monitoring over materials haulage to rock-fill dam is to achieve 3D visual expression on internet for transporting vehicles and the surroundings, which is hydropower project construction site layout. On the basis of analysis on 3D visualization process based on 3DS MAX and principles of web-based 3D visualization based on ActiveX technology, the implementation scheme of web-based 3D visualization of monitoring over materials haulage to dam is designed and its implementation methods are analyzed in detail. The real-time motoring and analysis system of materials haulage to rock-fill dam with network, digitalization and visualization, which is developed in B/S architecture, provides supports to engineering construction management.
Dynamic Adaptive Sliding Mode DC Power Modulation Controller in Parallel AC/DC Transmission System
Authors: Wang Bao Hua , Shi Zhong Ke
Published: January 2012

The effective DC power modulation controller influences the security and stability of AC/DC interconnected power system significantly. Based on the direct feedback linearization model of parallel AC/DC transmission system, the DC power modulation controller is designed by using the dynamical adaptive sliding mode control designing method. Using an adaptive technique to estimate the switching control gain and damping coefficient, the dynamical sliding surface is proposed to eliminate tremble. The proposed adaptive sliding mode control scheme can be implemented without the requirement that the bounds of the uncertainties and the disturbances should be known in advance; meanwhile its design is very simple. The simulation results show that this proposed controller is superior to the nonlinear H∞ DC power modulation controller in damping oscillation and robustness.
Design and Implementation of Information Management System for Gas Valve Remote Monitoring and Control
Authors: Ma Jun Gong , Gao Xiao Hua , Liu Yue Xue
Published: January 2012

Running in safe and stable status is a core issue of gas valve. An effective method was proposed in this paper to solve the problem of gas valve monitoring and control. The information obtaining and analysis system of gas valve were developed based on visual studio 2005 and sql sever 2005. Multiple functions such as data querying, information management, data statistics and report generation are included in this system. More important, the gas valve working status and key parameters can be monitored and controlled in real-time. While detecting state parameters exceeding the normal range, alarm will be sound and the response people’s cell will be called.
Pre-Concentration Capability for Trace Heavy Metal Ions with Manual-Controlled Injection Porous Nano-Barium-Strontium Titanate Microspheres Enricher
Authors: Zhang Dong
Published: January 2012

The micro-column packed with porous nano-barium- strontium titanate microspheres, joining with injector, a new manual-controlled injection porous nano-barium- strontium titanate microspheres enricher (PBSTME) was prepared. The enrichment capability of the PBSTME for the heavy metal ions, such as zinc, nickel, copper, manganese, cobalt and silver was investigated. The results showed that all the heavy metals studied could be quantitatively retained by the PBSTME in the pH range of 5–8, and then eluted completely with 2 mol•L-1 HNO3. The detection limits of this method for zinc, nickel, copper, manganese, cobalt and silver ions were 0.028 μg•L-1, 0.2μg•L-1, 0.031 μg•L-1, 0.022 μg•L-1, 0.057μg•L-1 and 0.039 μg•L-1 with an enrichment factor of 50, respectively. A new method has been developed for the determination of trace heavy metal ions based on pre-concentration with a PBSTME prior to their determination by flame atomic absorption spectrometry. The method has been applied to the simultaneous determination of trace amounts of zinc, nickel, copper, manganese, cobalt and silver ions in water sample with satisfactory results.
New Algorithm to Identify Inrush Current Based on Improved EMD
Authors: Chen Da Zhuang , Huang Jia Dong , Sun Yang
Published: January 2012

Empirical mode decomposition (EMD), which is the core mechanic of the Hilbert-Huang transform(HHT), is a local, fully data driven and self-adaptive analysis approach. It is a powerful tool for analyzing multi-component signals. Aiming at the reduction of scale mixing and artificial frequency components, an improved scheme was proposed for analysis and reconstruction of nonstationary and multicomponent signals. The improved EMD method uses the wavelet analysis method and normalized correlation coefficient to deal with the problems. Because the inrush current is a peaked wave with nonstationary component, a new algorithm based on improved EMD is presented for fast discrimination between inrush current and fault current of power transformers. Theoretical analysis and dynamic simulation results show that the method is effective and reliable under various fault conditions and simple to be applied.
Speciation of Cr(III) and Cr(VI) by Porous Nano-Barium-Strontium Titanate and Flame Atomic Absorption Spectrometry
Authors: Zhang Dong
Published: January 2012

A sensitive method has been developed for the speciation of Cr(III) and Cr(VI) in natural water using a porous nano-barium-strontium titanate by sorghum straw template method (SPBST) and flame atomic absorption spectrometry (FAAS). The procedure presented based on Cr(III) and Cr(VI) show different adsorption capacities on the SPBST at different pH values, that is, Cr (III) selectively retained at pH 13, but Cr(Ⅵ) can’t be adsorbed. Whereas Cr (VI) retained at pH 1, but Cr(Ⅲ) can’t be adsorbed. Hence, Cr(Ⅵ) and Cr(Ⅲ) can be separated through changing pH value of medium. Cr(Ⅵ) and Cr(Ⅲ) adsorbed on the SPBST can be completely eluted using 1•0 mol•L−1 NaOH and 1.0 mol•L−1 HCl, respectively. And Cr(Ⅵ) and Cr(Ⅲ) were determined by FAAS, The preconcentration factor of the method was 100. At the optimum conditions determined experimentally, the adsorption capacities were calculated to be 21.6 mg•g−1 and 7.3 mg•g−1, respectively. The proposed method was applied to the determination and speciation of chromium in tap water, lake water and wastewater samples with satisfactory results.
A Novel Power Swing Blocking Scheme Using Orthonormal Wavelet Analysis
Authors: Zhang Yi Hui , Zhang Hai Yan , Xu Wei Li
Published: January 2012

A new scheme for fault identification during power swings is proposed in this paper. The new scheme is based on the orthonormal wavelet transform algorithm. The main advantage of the proposed scheme is that different types kinds of fault of the transmission line can be correctly identified from different types of the fast power swings. Also, the faults during power swings can be identified from the power swings with the proposed scheme without any time delay. Furthermore, the problem whether the protection should trip or not immediately for the distance protection is discussed in the paper. Test results with the data sampled from EMTP verify the effectiveness of the proposed scheme. Furthermore, another advantage of this algorithm is that it can be realized for the real-time applications with finite real calculation.
A Three-Way Remote Intelligent Terminal Based on Common Mobile
Authors: Sun Jian She , Lv Chun Feng , Sun Yi Fei , Cao Xi Jun
Published: January 2012

An intelligent terminal of telemetering, remote control and remote signaling which was capable of all the system operation regarding distant data transmission and monitoring on mobile, was assembled through the application of microcontroller and industrial communication module. Various physical quantities of devices could be measured and text-message transmitted by the designed multi-sensor. a microcomputer control center monitoring all kinds of terminals could be set up. The design can be further applied in Internet of Things.
Design of the Software System on Onboard Computer for Service Robots Based on Behavior Control
Authors: Zhou Feng Yu , Guo Dan , Tian Guo Hui , Song Bao Ye , Li Cai Hong
Published: January 2012

Aiming at the service robots in the family and hospital environment, the architecture of the onboard computer software for service robots is designed based on behavior control. And by using the weighted synthesizing based multi-action fusion mechanism in the software, the service robot complex behavior control is better realized. Experiments and applications show that the software system has many merits such as friendly interface, stable performance, convenient usage, good expansibility, and better meets the requirements of the service robots to software system on onboard computer in the home, office and medical environment. In reality, it has some potential benefits for their applications in relative fields.
PID Control Based Missile Sub-Channel Simulation
Authors: Chen Chao Bo , Liu Bing , He Ning , Gao Song , Pan Quan
Published: January 2012

The accuracy and real-time of modern missile flight control system of traditional aerodynamic can not be satisfied. In this paper a new method is presented to improve the accuracy and real-time of missiles under this condition. First of all, a missile sub-channel model of the dynamic equations and steering gear is established, then based on the established model, using PID controller to control steering gear and three channels of missile pitch, yaw, roll respectively which is called missile sub-channel PID control method, and finally making use of MATLAB/Simulink to complete the simulation. Simulation results show that compared with traditional aerodynamic control system, this method can reduce the response time of aerodynamic missile and enhance the stability of the control system obviously.
The Improved Method for Solving Permutation Problem in Frequency Domain Blind Source Separation of Speech Signals
Authors: Zhang De Xiang , Wu Xiao Pei , Lv Zhao , Guo Xiao Jing
Published: January 2012

The signals of convolutive mixture in time-domain can be transformed to instantaneous mixtures in frequency-domain and complex-valued independent component analysis (CICA) can separate efficiently the signals of instantaneous mixture in each frequency bin. However, since CICA is calculated in each frequency bin independently, the permutation ambiguity becomes a serious problem. The permutation ambiguity of CICA in each frequency bin should be aligned so that a separated signal in the time-domain contains frequency components of the same source signal. The paper presents a novel and efficient approach for solving the permutation problem in frequency domain blind source separation of speech signals. The new algorithm models the frequency-domain separated signals by means of Teager energy correlation between neighboring bins for the detection of correct permutations. Experimental results show that the proposed algorithm can efficiently solve the permutation ambiguity problem in each frequency bin.