bluuebunny/crossref_metadata_2025 huggingface dataset:
Hybrid Probabilistic and Non-Probabilistic Dynamic Analysis of Vehicle-Bridge Interaction System with Uncertainties
Authors: Liu Neng Guang , Gao Wei , Song Chong Ming , Zhang Nong
Published: May 2014

A hybrid probabilistic interval dynamic analysis of vehicle-bridge interaction system with a mixture of random and interval properties is studied based on finite element analysis framework. A half car model is used to represent a moving vehicle and the bridge is modeled as a simply supported Euler-Bernoulli beam. The vehicle’s parameters are considered as interval variables and the bridge’s parameters are treated as random variables. The mathematical model of vehicle-bridge interaction system is established based on the finite element model. By introducing the random interval perturbation method into the dynamic analysis of vehicle-bride interaction system, the expressions for the mean value and variance of the bridge dynamic response are developed. Examples are used to illustrate the effectiveness of the presented method. The accuracy and effectiveness of the numerical results are verified by a hybrid simulation method combining direct simulations for interval variables and Monte-Carlo simulations for random variables.
Sustainable and Deconstructable Semi-Rigid Flush End Plate Composite Joints
Authors: Ataei Abdolreza , Bradford Mark A.
Published: May 2014

Composite construction is a popular and effective method of construction, exploiting the strengths of both reinforced concrete and structural steel in building construction in a complementary fashion. Within paradigms related to minimisation of emissions and maximisation of product recycling, these composite systems are problematic on a number of fronts. Firstly, common and traditional composite systems utilise ordinary Portland cement, which is known to be a very large contributor to atmospheric CO2 emissions. Secondly, for typical construction practices for steel-concrete composite systems, casting of the concrete onto profiled steel decking and conventional reinforcement placing are undertaken on-site, which is time consuming and labour intensive, and which can increase the cost of construction. Thirdly, composite action between the steel beam and the concrete slab is usually achieved by using headed shear studs. The headed shear studs connect these two elements permanently, which leads to much waste at the end of the service life of the building when it is demolished. This paper models a sustainable semi-rigid beam-to-column composite blind bolted connection with deconstructable bolted shear connectors using ABAQUS finite element (FE) software. In this “green” system, precast geopolymer concrete (GPC) slabs are attached compositely to the steel beam via pretensioned bolted shear connectors and the composite beam is connected to GPC-filled square columns using blind bolts. Non-linear material properties and non-linear geometric effects are considered in the simulation of a connection in hogging bending. Based on the FE modelling, using pretensioned bolts as shear connectors with GPC can improve the behaviour of semi-rigid flush end plate composite joints in terms of ductility and load capacity. Moreover, the behaviour of the bolted shear connectors should be considered in composite joint design as being very different to headed stud connectors.
Implementation of a Non-Orthogonal Constitutive Model for the Finite Element Simulation of Textile Composite Draping
Authors: Pierce Robert S. , Falzon Brian G. , Thompson Mark C. , Boman Romain
Published: May 2014

In the pursuit of producing high quality, low-cost composite aircraft structures, out-of-autoclave manufacturing processes for textile reinforcements are being simulated with increasing accuracy. This paper focuses on the continuum-based, finite element modelling of textile composites as they deform during the draping process. A non-orthogonal constitutive model tracks yarn orientations within a material subroutine developed for Abaqus/Explicit, resulting in the realistic determination of fabric shearing and material draw-in. Supplementary material characterisation was experimentally performed in order to define the tensile and non-linear shear behaviour accurately. The validity of the finite element model has been studied through comparison with similar research in the field and the experimental lay-up of carbon fibre textile reinforcement over a tool with double curvature geometry, showing good agreement.
Revolute Joint Approach to Model Joint Mechanism in Water-Filled Road Safety Barriers
Authors: Thiyahuddin M.I. , Gu Yuan Tong , Thambiratnam D.P.
Published: May 2014

Portable water-filled road barriers (PWFB) are roadside structures placed on temporary construction zones to separate work site from traffic. Recent changes in governing standards require PWFB to adhere to strict compliance in terms of lateral displacement and vehicle redirectionality. Actual PWFB test can be very costly, thus researchers resort to Finite Element Analysis (FEA) in the initial designs phase. There has been many research conducted on concrete barriers and flexible steel barriers using FEA, however not many was done pertaining to PWFB. This research probes a new technique to model joints in PWFB. Two methods to model the joining mechanism are presented and discussed in relation to its practicality and accuracy. Moreover, the study of the physical gap and mass of the barrier was investigated. Outcome from this research will benefit PWFB research and allow road barrier designers better knowledge in developing the next generation of road safety structures.
Morphology of Irradiated Adjacent Single-Walled Carbon Nanotubes
Authors: McDonell Katherine , Proust Gwénaëlle , Shen Lu Ming
Published: May 2014

Molecular dynamics was used to simulate the electron irradiation of two adjacent single-walled carbon nanotubes (SWNTs) via the Primary Knock-on Approximation. Temperature effects on the creation and evolution of defects were studied. The most prevalent defect was atomic vacancy which evolved into multi-vacancy over successive irradiation impacts. Cross linking was also observed. As temperature increased, mending of damage was promoted and the stability of bonds decreased. A new morphology of cross linking in the form of interconnecting carbon rings is presented.
The Design and Simulation of Diesel Engine Exhaust Muffler
Authors: Zhou Zhi Hao , Chen Dao Lai , Ji Ling Zhang , Wan Shou Peng
Published: May 2014

This paper is to use a fast and useful simulation method to verify the acoustics performance of the exhaust muffler which was designed, and find a better muffler. Based on analyzing the spectral of diesel engine exhaust noise and the muffler theory, and designed two different type of muffler. Got the transmission loss of muffler by using software. Finally, compared the two projects’ transmission loss and got the better effect.
Coal Mine Equipment Design Environment Evaluation
Authors: Mao Ping Huai , Zhang Shuai
Published: May 2014

With the development of economy and technology, the whole society environmental protection consciousness enhancement, more and more eyes begin to pay close attention to environmental problems. Today, coal mine in mechanized production equipment for the environmental impact of coal enterprises account for a large proportion, in order to better development of an environment-friendly coal mine, coal mining equipment to carry out environmental assessment. This paper to extend to silt coal loader, reprint machines and other equipment in coal mine for example, to equipment in the environmental impact of the entire life cycle (From design, use, to scrap) analysis, prediction and evaluation.
Simulation Analysis of Metal Flow in High-Speed Cold Roll-Beating
Authors: Cui Feng Kui , Xie Ya Fei , Dong Xiao Dan , Hou Li Min
Published: May 2014

In order to achieve the metal flow law in high-speed cold roll-beating, the metal flow state was analyzed on the basis of the principle of high-speed cold roll-beating and the Law of Minimum Resistance. The finite element analysis model was established based on the processing of involute spline; high-speed cold rolling forming process was simulated. The equivalent strain and the flow track of a set of nodes on the contact surface on different time are analyzed, the flow law of each node is given, and simulation analysis result is compared with theoretical analysis result.
The Method of Fillet Contour Error Compensation Applied in End Cylindrical Crankshaft Grinder
Authors: Luo Min , Chen Ling Yun , Chen Zhi Chu
Published: May 2014

The Contour accuracy of a crankshaft transition fillet is important for the crankshaft working reliability. The front end surface, cylindrical surface and the transition fillet of a crankshaft are grinded by an end cylindrical grinder. During this machining, due to the roller’s shape error and other factors, the contour error of the fillet cannot be guaranteed while 90 degree circular arc interpolation was taken. In this paper, a fillet contour error compensation model was established, the appropriate compensation macro program was designed, and the radical contour error compensation was implemented through 9 circular arcs approaching. The practical application is shown that the satisfactory result is achieved and this method can also be applied in the fillet compensation for wheel dressing when applying diamond disk or stylus.
Mechanics Analysis of Overhanging Submarine Pipeline Based on ANSYS
Authors: Liu Yuan Yong , Li Fang , Wei Xiu Ting
Published: May 2014

Stress analysis model of overhanging section of pipeline is created through submarine oil pipeline as analysis object, stress conditions of actual working conditions is considered, transition length is introduced to proceed finite element analysis of the pipeline, ANSYS software is used to calculate the stress and deformation of pipeline under different overhanging length in this paper. The curves of the maximum stress and maximum deformation with overhanging span are made, the variations of the maximum stress and maximum deformation are obtained according to the calculated data. This study provides data support for the failure identification of submarine oil pipeline, which has an important significance for the overhanging analysis and treatment of submarine pipeline.
Mathematical Model for the Influence of Machine Tool Parts Deformation on Machining Accuracy
Authors: Cui Li Gong , Liang Gui Qiang , Shao Fang
Published: May 2014

This paper presents a mathematical method to analyze the influence of each machine tool part deformation on the machining accuracy. Taking a 3-axis machine tool as an example, this paper divides the machine tool into the cutting tool sub-system and workpiece sub-system. Taking the deformation of lower surface of the machine bed as the research target, the mathematical model of the deformation on the displacement of the cutting point was established. In order to distribute the stiffness of each part, the contribution degree of each part on the machining accuracy was analyzed. Using this mathematical model, the stiffness of each part can be distributed at the design stage of the machine tool, and the machining accuracy of the machine tool can be improved economically.
Tool-Path Scheduling for Free-Form Surface Based on MasterCAM
Authors: Ren Wen Jing , He Jian Yun , Yu Yuan
Published: May 2014

The tool-path generating methods of roughing and finishing provided by MasterCAM were systematically analyzed including their features and applications. Then a blade with freeform surface milled by different tool-paths was simulated. According to the comparison of simulation effects and information, the flow-line tool-path was proposed to be optimal for machining blade with freeform surface. Finally, the blade was finished with optimal tool-path using a 3-axis NC milling machine.
Electrochemical Investigation Cu Corrosion Behaviour of Electronic Circuit Board in Base Electrolyte
Authors: Tao Zhi Hua , Leng Bin , Wang Chong , Xiao Ding Jun , Tan Ze , He Wei
Published: May 2014

The eleetronic material, or even the whole equipments may be destroyed by very slight corrosion, so it is important to study the corrosion mechanism and corrosion protections. The Cyproconazole as a Cu corrosion inhibitor for Electronic Circuit Board in the base electrolyte (containing 70 ppm chloride ions, 0.54 mol/L H2SO4and 0.8 mol/L CuSO4) was investigated using polarization curves and AC impedance. The results showed that the inhibition performance of the Cyproconazole depended on the concentration of the inhibitor and the highest inhibition efficiency of the Cyproconazole reached 99.9% at 1×10-3mol/L in the base electrolyte. The results obtained from EIS measurements are in good agreement with that obtained from potentiodynamic polarization. Potentiodynamic polarization studies clearly revealed that Cyproconazole adsorption acted essentially as the mixed-type inhibitor.
Physical Simulation Experiment Research of Steam and Gas Assisted Gravity Drainage
Authors: Zhong Li Guo , Wang Yan Chao , Zhang Ya Qi
Published: May 2014

Aiming at the problems in the conventional SAGD production process, taking a heavy oil reservoir in Bohai oilfield for prototype, we design and manufacture a set of three-dimensional physical model which is resistance to high temperature and high pressure. Under the same temperature and pressure, using this physical model we made two sets of indoor experiments. The experimental results show that steam and gas assisted gravity drainage has the characteristics of high output at the early stage, dramatic decrease at the end compared with the SAGD mining, development effect of high pressure reservoir is good when using steam and gas assisted gravity drainage after steam and gas stimulation preheating, recovery of steam and gas assisted gravity drainage after three rounds of steam and gas stimulation preheating is improved significantly.
A Frequency Tracking Adaptive Power Line Interference Canceller for Electrocardiogram
Authors: Wang Bao Jie , Men Yan , Zheng Gang
Published: May 2014

Power line interference (PLI) may lead to the signal-to-noise ratio (SNR) decline sharply on biomedical signals, including the electrocardiogram (ECG). The proposed method employs the relationship of frequency and weights in adaptive filter to track the frequency variation of PLI. Real ECG signals from MIT-BIH database was used in the experiment, and they were corrupt by an artificial PLI signal for experiment. Correction performances of the proposed method and traditional adaptive method were compared by SNR in the paper. The results showed that the proposed method is consistently superior to the traditional one when the power line interference is vary with time, and the proposed method can track the variation of power line interference effectively.
A Novel Multimedia Player Based on Embedded System
Authors: Zhou Xian Cheng , Yu He Wei
Published: May 2014

This paper proposed a novel multimedia player based on embedded system. Different from normal player, it decodes the audio-video stream using a multithreaded mechanism based timeline, and does not need the traditional driving library for playing media — FFMPEG. The player decides the IDR frame for every group of audio-video stream at first, then plays stream according to the interactive model of audio and video. It makes the best use of decoding acceleration engine of embedded chip, has higher decoding efficiency, and saves a lot of resource for embedded system.
Design of Door Monitoring Interface Based on Qt4 and SQLite
Authors: Xie Cong , Song Shao Jian
Published: May 2014

With the number of private cars increasing, the problems such as the shortage of parking spaces, the disorder and congestion of parking are becoming serious, especially in a flourishing business street. So we do the research based on an underground parking lot at a commercial district. In this paper, we design a monitoring interface based on embedded cross-platform GUI system-Qt4 and embedded SQLite combining RFID and Zigbee technology on computer, and then transplant it to Intel PXA270 based on ARM-Linux. The designed system can realize automatic identification, charging of vehicles and displaying parking spaces. It can improve the efficiency of parking.
Dead-Time Compensation of SPWM Based on STM32F103
Authors: Zhuang Sheng En , Gao Ming Yu , Zhan Xin Xin , Wang Liang
Published: May 2014

This paper analyzes the negative influence of dead-time,point out the shortcomings of traditional dead-time compensation methods , and then present a dead-time compensation method. Simulink simulation shows that the proposed method is effective. The proposed method is applied to a 15kW inverter which is controlled by STM32F103 MCU,and it can significantly reduce the THD value of the inverter output voltage waveform. The experiment proved that this method is simple and reliable, with good results.
Optimal Design of Battery Energy Storage System for Micro-Grid in Island Mode
Authors: Pan Hua , Deng Chang Hong , He Jun , Wu Zhi Kui , Guo Fang
Published: May 2014

Due to the intermittence and fluctuation of intermittent sources, microgrid needs energy storage system to make it functioning safely and stably, and the primary problem to be researched is how to determine the capacity of energy storage system. Microgrids of different conditions need energy storage systems of different capacities. This paper proposed an optimal sizing method for hybrid wind-solar-battery microgrids in island mode based on the modified particle swarm optimization. The method solves the optimal design problem on the premise that microgrids function safely, it also takes various restrictions of batteries into account, and finally the best sets of batteries are selected to achieve the optimal economic. A case study was presented to verify the effectiveness of the optimal sizing method.
Research Progress of CBD-ZnS Thin-Film Buffer Layer of Solar Cells
Authors: Ke Huan , Liu Ting Zhi , Duo Shu Wang , Zhang Hao
Published: May 2014

Thin film solar cells (TFSC) are the most potential for development of new and renewable clean energy. The large-scale production and application of TFSC can ease the energy crisis and protect the environment for human. However, buffer layer is a critical layer, which determines the performance of TFSC. This paper reviews the preparation, mechanisms, deposition systems, and development of ZnS thin-film buffer layers and points out that CBD-ZnS thin film is the best buffer layer material taking place of CdS.
Graph-Based Temporary Ground Wire Management in Distribution Network
Authors: Fu Xin Yang , Zhang Chong , Gai Shuai , Liu Wen Hua , Ni Zhuo Yue , Zhao Shi Peng
Published: May 2014

It requires a large number of temporary ground wires for maintenance tasks in distribution network. Because the temporary ground wires can be grounded anywhere, it is difficult to check their states and control them. Currently solutions are generally expensive in city-scale. This paper presents a method that integrates the complex monitor, control and communication modules into a pocket computer key. The abundant of ground wires are controlled by a simple electric lock, which will downgrade the cost of whole system. This paper also proposed a graph-base temporary ground wire management algorithm, which utilizes the Boolean adjacent matrix to determine the ground operations. The experiment results show that algorithm is more efficiency the baseline of the Topological Analysis Algorithm and the Logic-based Analysis Algorithm.
Analysis of Switching Power Supply Optimization
Authors: Tan Xiao Long , Zhou Jia , Wang Wen Bin
Published: May 2014

Model creating and simulation of switching power circuit in this paper was accomplished with PSpice A/D module in CAPTURE CIS. Components in library or created could be used for circuit model. After setting the parameters, simulation could be processed and the result is shown in PROBE. For simulation analysis, this paper creates models for every part of the circuit firstly and then the whole.
Analysis of Electric Vehicle Battery Charging and Discharging
Authors: Tang Zhe Ci , Guo Chun Lin , Jia Dong Ming
Published: May 2014

The more popular of electric vehicles is, the higher the load capacity of the battery is in the power system, therefore, the charging and discharging technology is particularly important. This paper introduces several electric vehicle battery charging methods commonly used at present, describes working principle of the bidirectional DC/DC converter in detail in the battery charging and discharging process, and the bidirectional DC/DC charging and discharging control strategy. Finally, the electric vehicle battery charging and discharging simulation model is built, the validity of the electric vehicle battery charging and discharging model is verified based on control strategies mentioned herein by use of simulation.
Analysis of Theory and Model of Background Magnetic Field of High-Spinning Projectile
Authors: Qi Ke Yu , Xiang Chao , Bu Xiong Zhu , Yu Jing
Published: May 2014

At present, methods of the navigation and the attitude measurements of projectile utilizing the magnetic fields are facing the interference from the BMF (background magnetic field). The principle and mathematical model of the BMF for the spinning projectile are been researched to realize the high accuracy measurement of the geomagnetic field on projectile. The composition and jamming mechanism of the projectile's BMF are derived with the Faraday electromagnetic induction theory. High precision compensation model of the geomagnetic measurement is established by synthesizing the magnetic sensor error model. Based on the idea of the error transfer, the attitude measuring errors caused by the BMF are analyzed and the error calculation formulas are given. On this basis, numerical simulation is conducted combining with projectile's flight rules. The results show that the influence of attitude angle measuring precisions caused by the background interference magnetic field are much bigger than the errors caused by the sensor noise and the established compensation model has obvious effect. Besides, the effective BMF compensation of geomagnetic measurements on the projectile must be conducted if the attitude angle measurement error is in requirements within ±1 °.
Experiment Research of a Certain Cu-Pb-Zn Poly-Metallic Sulfide Ore in Yunnan
Authors: Ran Jin Cheng , Liu Quan Jun , Zhang Zhi Guo
Published: May 2014

By comparing a variety of programs, for the feature of a certain Cu-Pb-Zn poly-metallic sulfide ore in Yunnan, using the processes of copper and lead priority floating, combined depressants of sodium silicate + sodium sulfite + carboxymethylcellulose in copper flotation, the tailings of bulk flotation for copper and lead after activated flotation of zinc mineral by copper sulfate, the successful implementation of effective separation of copper and lead and gained a better indicator of dressing.
Audio Decoding Chip in the Application of Embedded System
Authors: Gao Yun Hui , Suo Xiang Feng
Published: May 2014

Embedded system is a kind of special computer system that has certain function. Combining it with Multi Media and network technology could increase intelligence and agility of the devices. The use of embedded technology is becoming wider and wider with rapid development of information technology and rapid increase of consumers’ need. This thesis analyzes and studies the application of embedded system through actual project firstly. And then designs an embedded system based on ARM9 processor. Using audio CODEC UDA1341, this design have good effect .
Study on Reverse Charging of Stored Energy Capacitor in Pulsed Power Supply System
Authors: Liu Jian Bao , Bu Le Ping , Qin Xin Xin
Published: May 2014

When main discharge switch is put in discharging course of pulsed power supply in stored energy capacitor branch, the stored energy capacitor may have reverse charging phenomenon. Because of unilateral conductivity of the main discharge switch, the reverse voltage cannot be released and this would adversely affect service life of the stored energy capacitor and reduce working efficiency of the pulsed power supply. Through detailed deducing the discharging course of stored energy capacitor in pulsed power supply system, this paper analyzed relative factors affecting reverse charging voltage of stored energy capacitor and discussed necessary means that could reduce reverse charging voltage of stored energy capacitor. Based on this, a circuit structure with the main discharge switch in load branch is proposed and release of reverse charging voltage of stored energy capacitor is realized without affecting discharge current characteristics of the load. Simulation and test results show that the load current characteristics of the pulsed power supply after adjusting location of the discharge switch is basically the same as before the adjustment is made and completely meet requirement of electromagnetic emission. As a result, timely release of the reverse voltage extended working life of the stored energy capacitor and also improved efficiency of the electromagnetic emission system.
Performance Simulation Analysis of Contactless Excitation Energy Transmission Realized by Loosely Coupled Magnetic Tank Transformer
Authors: Liu Jin Feng , Wang Xu Dong , Yu Yong
Published: May 2014

Energy coupling realized by contactless magnetic tank transformer as new approach of rotator excitation in synchronous machine could replace brushes and slip rings of traditional excitation. For new contactless energy transmission (CET) system, its research about energy-efficiency quality still remains a low level because application and research of CET isn’t comprehensive, especially how to improve transfer power and efficiency isn’t enough. According to characteristics of contactless energy transmission system, mutual inductance model was used to describe the loosely coupled connection between primary and secondary winding. Then, optimum energy-efficiency product was proposed. We can use this indicator to consider efficiency, system cost, reliability and so on based on maximum output power. Mutual inductance coupling parameter would be optimized through this indicator and optimum design of system energy-efficiency characteristic would be realized at minimum cost. Although the input voltage had little increase, simulation research proved that system efficiency had a quit handsome increase based on optimum energy-efficiency product which established mutual inductance coupling parameter. This work is supported by National Natural Science Foundation (51177031).
Research of PFC Based on Boost Converter
Authors: Tan Xiao Long , Zhou Jia , Wang Wen Bin
Published: May 2014

Principles of traditional Boost PFC circuit are introduced. Based on average current control, a large signal model is obtained and turned into small signal model carrying constant load. And current regulator and voltage regulator are designed accordingly. Directing at strong non-linear characteristics of the circuit, this paper adopts double average method to analyze its low frequency stability. This converter can achieve high power factor in wide range of input and load power and simulation result shows that power factor is above 0.99.
Multi-Objective Optimal Power Flow with Transient Stability Constraints
Authors: Lu Jin Ling , Zhang Qiang
Published: May 2014

In this paper, the deficiency of the general transient stability constrained OPF model was analyzed,on the basis of which, a multi-objective transient stability constrained OPF model was proposed. The transient stability constraints was to be as a objective function instead of the general constraints,which and power generation cost function were taken weighted sum to be converted into a single-objective optimization model. Multiple optimal solutions under different weights were given based on the original dual interior point method,which can offer a variety of options for operating personnel according to actual needs. In terms of improving the efficiency of the algorithm,The two groups of differentiated rotor equations were eliminated to be one set of equations.And the transient differential equations were dispersed to inequality constraints instead of equality constraints.the dimensions of the correction equation and the scale of the problem solved were significantly reduced. Numerical simulations on the New England 10-generator 39-bus power system, demonstrated the effectiveness and feasibility of the proposed method.
The Simulation of Distribution Parameter of the Three-Phase D-Dot Voltage Sensor
Authors: Zhu Li Yun , Wang Jin Gang , Fan Yu Yi , Bai Yun Jie
Published: May 2014

As an electric coupling sensor, the D-dot voltage sensor can achieve non contact measurement of voltage. With the advantages of simple structure, a high dynamic range and measurement bandwidth, it can meet the needs of accurate measurement[1][2]. Thus it has great application prospects in voltage on-line monitoring, relay protection or other fields in the power system. This paper considered the operation of the three-phase lines, and established the D-dot voltage sensor simulation model in the simulation platform of Ansoft Maxwell 3D. With the simulation of the sensor working conditions, we can get the distributed parameters of the system under three-phase lines in operation, construct an equivalent circuit of measurement and analyze the simulation results to get a voltage signal of input and output. The simulation results show that, with the equivalent circuit simulation of the three-phase D-dot voltage sensor, if we improve electrode capacitance parameter, there will be a good linear relationship between the input and output.
Design of a Digital Breathing Rate Tester Circuit
Authors: Li Huang , Lin Li Feng
Published: May 2014

Digital breathing rate tester uses amplifier circuit, filter circuit, shaping circuit, and frequency quadruplicator circuit to process respiration signals. The signals processed are mixed with signals from logic controller circuit, pass the NAND gate, combine with signals from NAND gate and enter the pulse counter circuit. Pulse counter circuit’s digital tube shows the breathing rates.
Two-Band Antenna Reflection Board Using Multi-Layer Mush-Like EBG
Authors: Zhao Qing Feng , Wang Su Ling , Guo Nan
Published: May 2014

A Multi-layer mush-like EBG used as the reflector of dipole antenna is discussed. The paper focuses on the reflection phase feature of Multi-layer mush-like EBG surface. Compared with classical double layer EBG reflector which has one in-phase frequency the proposed structure can realize two or more in-phase frequencies resonance thus could be used as double frequency antenna reflector. The simulation results proved that the proposed EBG structure had a good return loss meanwhile both radiating patterns of the two frequency bands meets the expectations well and the antenna’s gains of the two bands are more than 7.08dB
The Principle and Application of TMS
Authors: Liang Guo Zhuang , Liu Lin , Zhu Quan Min
Published: May 2014

Transcranial magnetic stimulation is a biological stimulation technique born in the middle of 1980’s, which can affect and change brain function. Compared with the conventional electrical stimulation, it has so many advantages that it seems very likely to become an important tool in doing research into brain function; moreover, with the development of this technique, its applications of in clinical medicine is more and more appreciated. This paper emphasizes the basic principle and applications of tanscranial magnetic stimulation.
Wireless Control of Mobile Robot Technology Research Environment under Linux
Authors: Xu Ling , Song Yan , Mao Le
Published: May 2014

Good use of embedded Linux open, portability features, wireless control systems for mobile robots to build; while the dynamic model of the mobile robot kinematics model and analyze and track their trajectory control methods studied, BP-PID trajectory tracking control algorithm. Research results show that the wireless control system built with the design requirements, the use of the control algorithm is effective and reliable.
Research of Control System of Variable Frequency Motor
Authors: Zhou Jia , Tan Xiao Long , Wang Wen Bin
Published: May 2014

Variable frequency motors replace traditional ones which use mechanical and DC speed regulation strategies. The frequency of the motor torque and the motor inductance and frequency are directly related. Therefore, the inverter motor control system analysis and modeling of nonlinear frequency conversion motor without inductance calculations.
Design and Application of PWM Digital Controller Based on FPGA
Authors: Liu Shu Lin , Xu Xin Qi
Published: May 2014

A digital PWM controller based on FPGA with the voltage feedback control mode is designed. The function blocks and the timing of the digital controller are introduced. The controller is applied in Buck circuits to verify the system function. The experimental results show that the designed controller has fast and strong real-time response speed with high reliability, which prove the correct theoretical analyses and feasibility of the proposed method.
Intelligent Control of the Dynamic Tension of Yarn by Means of Sensors in Winding Process
Authors: Tong Yun
Published: May 2014

Concerning the intelligent technique control of automatic winder in textile production, the tension of yarn in unwinding and winding process is a key factor among various technical parameters, the speed known as linear and rotational speed and the position of yarn layer on bobbin will definitely affect the dynamic tension of yarn during the winding process. the photoelectric encoder sonser is used for measurement of the rotationtional and linear speed of cyclinder of winder machine.
Position sonser can detect the amount of the remaind yarn layer on bobbin so as to regulate the position of the tension controller to make the dynamic tension to be uniform and approporite.
Optimization of Automotive Powertrain Based on Genetic Algorithm
Authors: Cao Feng Ping
Published: May 2014

In order to improve the performance of the cars, an optimization algorithm of transmission parameters that take into account automotive dynamic and fuel economy based on genetic algorithm was presented in the paper. Firstly, the origin underway accelerate time was chose as the dynamic target function, and the 100 kilometers fuel consumption of 15-cycle driving was used to evaluate fuel economy, and the two objectives functions were putted into a comprehensive objective function. Then, the constraints were established using the requirement of automobile power performance and transmission design, and the genetic algorithm was adopted to do the optimization. At last, a simulation experiment was design to confirm the validity and effectiveness of the proposed method.
Investigation of the Mechanical Properties of Intercritically Treated Ultra High Strength Steel
Authors: Li Zhuang , Wu Di , Yu Huan Huan , Luo Lei , Liu Ming
Published: May 2014

Intercritically treated ultra high strength steel was investigated using a continuous annealing simulator of the laboratory. The results have shown that the microstructure consists of a ferrite matrix with martensite. A satisfactory mechanical property was obtained by intercritical annealing and subsequent overaging. The specimen exhibited optimum Rm (1360MPa) and At (20%), a relatively low Rp0.2/Rm (0.72) and an ideal product of Rm and At (27200MPa%). Satisfactory mechanical properties of the present steel are attributed to the fact that the effect of dispersion strengthening of martensite islands as well as the contribution to strength by the softer phase, such as ferrite (retained austenite).
Analysis of the Variable Intake Control Technology on the Car
Authors: Liu Yan
Published: May 2014

In recent years, major car companies research and use a variety of advanced intake control technologies, the most commonly used techniques are the power valve control technology, harmonic boost control technology, variable valve timing control technology. After the actual using, these techniques can really improve the volumetric efficiency of the engine, improve engine performance.
Study on Temperature Uniformity and Rising Rate of High-Power Lithium-Ion Battery Pack
Authors: Wang Bo , Nie Yu Ming , Yin Zhan Ji , He Zhi Tong
Published: May 2014

According to the operating characteristics of high-power battery pack in practical application, the effects of four factors, which include operating load, state of charge (SOC), ambient temperature and operating temperature, on the temperature uniformity and rising rate of battery pack under natural convection were studied based on Arbin test bench. The results indicate that: the operating load and SOC of battery pack doesn’t affect its temperature uniformity, which was deteriorated as the increasing of operating temperature of battery pack, or improved as the increasing of ambient temperature when the other factor is kept constant. The increment of operating load or ambient temperature could result in a higher temperature rising rate, while the increasing of SOC or operating temperature could lead to a lower temperature rising rate, when the other three factors are kept constant. When the operating temperature or temperature differences achieved threshold value, thermal management system should choose proper extent of forced flow and flow field in accordance with the battery pack’s current operating conditions, in order to ensure the economy of the thermal management system.
Vehicle Statistics and Retrograde Detection Based on Characteristic Analysis
Authors: Ye Qing , Zhang Li , Zhang Yong Mei
Published: May 2014

Vehicle detection in the traffic monitoring system has been widely studied in recent years. This paper presents a vehicle detection method based on different object motion characteristics to track the moving vehicles. Firstly, we use the frame different method to detect the moving objects. Secondly, we do binarization and filtering processing with the adaptive threshold segmentation technique to extract the moving vehicles in the traffic video. Then we determine centroid displacement to recognize the vehicle motion characteristics for retrograde judgment. Finally, we draw the vehicle trajectory and make the vehicle motion statistics. Experiment results show that the method can real-time track the moving vehicles and accurately get the vehicle retrograde detection.
Joint Detection of Spatial-Temporal Spectrum Holes for Cognitive Radio Networks
Authors: Liu Fu Lai , Guo Shou Ming , Du Rui Yan
Published: May 2014

Spectrum sensing is a key technology to reliably detect spectrum holes in multi-dimensions for cognitive radio networks. In this paper, a joint spatial-temporal spectrum sensing scheme is proposed. First of all, the secondary users (SUs) located inside the primary exclusive region (PER) perform temporal sensing. When the primary user (PU) is present, the SUs located outside the PER perform spatial spectrum sensing. The proposed method can improve the spectrum utilization by exploiting both temporal and spatial spectrum holes. The achievable throughput for the secondary network of joint spatial-temporal sensing is higher than that of pure temporal sensing. Simulation results demonstrate the effectiveness of the proposed approach.
Image Calibration for Machine Vision Inspection System
Authors: Feng Liang Shan , Huang Ying Ping , Xu Zhu Kai , Zhang Yong
Published: May 2014

Machine vision system has been widely used for a variety of applications in industrial testing and measurements. However, image distortion caused by optical system and system re-positioning will bring errors to the machine vision detection system. This paper addresses on three types of image distortions including optical distortion and perspective deformation, image translation and rotation, and image scale change. To rectify optical distortion and perspective deformation, a black and white grid pattern is used as a standard template for finding the multiple matching points between distorted image points and ideal image points, and then a polynomial mathematical model simulating the geometric distortion is established. The distortion coefficients are calculated from the least square method. Image translation and rotation are compensated by using a floating fixture origin as the reference point. Image scale change is remedied by using a standard scale factor to shrink or enlarge an actual image to its standard size. The experimental results have demonstrated the effectiveness of the approach proposed.
Real-Time Detection of the Flexible Needle Shape by Using Strain Gauges
Authors: Zhang Ji Chao , Dong Wei , Du Zhi Jiang
Published: May 2014

In flexible needle insertion procedures, the needle path tracking plays a crucial role in the trajectory control. In this paper, a methodology is proposed to detect the shape of the flexible needle in real time by using the strain gauge sensing. The curvature information of the flexible needle can be obtained based on the stain signal of the gauges which are glued on the needle body markers. Based on this basic approach, the trajectory of the needle can be calculated and displayed, which integrates the discrete markers curvature information. The work reported in this paper indicates a practical significance in the smart medical system implementation without medical imaging equipments.
Detection of the Center of Eyes’ Position Based on Grating Projection Method
Authors: Chen Guo Long , Li Dong Zhe , Huang Zi Qiang
Published: May 2014

In traditional grating auto-stereoscopic displays,the head movement would lead to the crosstalk of 3D images. There is a way to minimize the crosstalk from utilizing eyes’ position to rearrang the RGB sub-pixels.In this paper, a method to detect the center of eyes which is based on black and white binary grating projection is proposed. After projecting periodic grating composed by black and white stripes from projector,the CCD intakes deformed stripes,using the offset which is compared the deformed fringe with the reference to restore facial contours. Recover the morphology conveniently from encoding every deformed stripe with an unique code. Experimental results show that this method requires less image,has strong anti-interference abilitity.It is easy to get the position of eyes’center after getting the face contour,so this method could be applied as a new way in the nose and face recognition and tracking fields.
Research on Outdoor Positioning Based on Ray Tracing Method
Authors: Peng Xian Qiang
Published: May 2014

GPS can’t detect the signal because of the cell complex environment in the outdoor and poor radio wave propagation conditions, so that the positioning result is not ideal. However, the positioning method using the ray tracing prediction of radio waves, the tracking point of the scene from all the source radiation, record the relevant parameters, and then positioned within the microcell environment can satisfy the demand. The principle of ray tracing was firstly introduced in this paper, then an outdoor positioning model was set up, finally, the corresponding simulation experiments was implemented to demonstrate the effectiveness of ray tracing positioning in the outdoor environments.
Analysis and Exclusion of Magnetization Failure on CJW-3000 Magnetic Flaw Detection Machine
Authors: Zhang Tie Zhu , Li Fu Sheng
Published: May 2014

This paper analyzes the common faults in the magnetization process of CJW-3000 Magnetic Flaw Detection Machine and gives exclusion methods. In line with the principles of the easier issues first, by starting the analysis from Circuit Drawings, we can increase maintenance efficiency and avoid doing too much exercise in futility.
Indoor Three-Dimensional Positioning Method Based on CSS
Authors: Liu Gao Ping , Zhang Jin Yan , Yang Ru Xiang
Published: May 2014

This paper designs a three-dimensional positioning scheme suitable for indoor, adopts Chirp Spread Spectrum (CSS) and the particular Symmetric Double-Sided Two-Way Ranging (SDS-TWR). Combining BMP085 pressure sensor to measure altitude, it can implement three-dimensional positioning of a moving object in indoor. Due to the complex indoor environment would cause multipath effect when Chirp signal being transmitted, this scheme uses Kalman filtering method to filter out mutative coordinate value, thus the positioning error can be controlled within 1 m.
α Extension of a Class of T-Bezier Curve
Authors: Wang Cheng Wei
Published: May 2014

By introducing the concept of weights in NURBS curve into a blending technique,the paper extends the representation of the T-Bezier curve.The generalized T-Bezier curve is denoted as α Extension T-Bezier curve,whose shape-control capability is shown to be much better than that of T-Bezier curve.The representation and properties of the extension curve is studied.The curve is easy and intuitive to reshape by varying the parameters;so it is useful in some applications of CAD/CAM .
Dynamic Task-Scheduling Based Parallel Processing on Watershed Distributed Eco-Hydrological Model
Authors: Li Yao , Jiang Da Lin
Published: May 2014

Watershed distributed eco-hydrological model is an important tool in the field of global change research. Due to the complexity of eco-hydrological model, watershed distributed eco-hydrological simulation requires large amounts of computations. The compution overhead turns to be a big prolem for those basin areas. Another challenge is that the traditional sequential computation techniques cannot meet the requirements of watershed eco-hydrological model, which highly limits the application of watershed distributed eco-hydrological model in large scale areas. This paper proposed a dynamic task-scheduling based parallel processing method for eco-hydrological model. The whole simulation task are firstly decoupled into independent grid based parallel processing tasks based on the relation of upstream and downstream sequence. Then a dynamic task-tree was built up according to the dependency of each cell in the watershed, which can generate dynamic task scheduling sequence. Following the task scheduling sequence, PBS task scheduler submitted workloads, realizing parallel calculation. This approach was applied in the watershed of Walnut Gulch watershed in Arizona, USA. The result showed that this method can highly improves the efficiency of watershed eco-hydrological modeling almost 6 times compared to that of the traditional sequential eco-hydrological modeling. Therefore, this approach can effectively promote the applications of watershed eco-hydrological model.
Study on Elongation Properties of Car Roof Interior Fabric
Authors: Chen Wei Lai , Wan Lin Yan , Zhan Wei Hong
Published: May 2014

Elongation properties of car roof interior fabric were studied in this article.The FM02-11 type universal material testing machine was employed to test the static and dynamic elongation properties of warp knitted napped fabric 1,2,3,warp knitted fabric 1,2,pile composite fabric A1,A2,A3 and sponge composite fabric C1,C2,C3,C4. The results indicated all can meet the general standard for car interior ceiling fabric.According to the dynamic elongation, the bigger the deformation ratio, the better the formability.
The Research on the Fusion of Sobel Evaluation Function about Vehicle Contour Clearness Algorithm
Authors: You Xu Chen , Li Yu Hui , Li Bo , Liu Xian Biao
Published: May 2014

In order to improve the controllability and rationality of vehicle object contour repair process, this paper proposes a fusion sobel evaluation function of vehicle contour clearness algorithm. Using the compensation method of image sequence inter-frame motion to restore vehicle object contour, to establish evaluation function based on sobel edge detection function, statistical characterization of the edge information of the number of pixels to restore judge, by constantly sequence of inter-frame motion compensation and evaluation of the iterative calculation, realize vehicle object contour clear. The experimental results show that this method is simple, effective、feasible and has good real-time performance and robustness.