bluuebunny/crossref_metadata_2025 huggingface dataset:
Throughput Analysis of IEEE 802.11e Enhanced Distributed Channel Access (EDCA) under Unsaturated Condition in One-Hop Ad Hoc Networks
Authors: Xie Li Ying , Ruan Jin Xin
Published: June 2013

With the previous proposed G/G/1 model, this paper analyzed the throughput expression in an unsaturated 802.11e one-hop ad hoc network. The expression is validated and the throughput performance is discussed by the simulations. The throughput expression derived in this paper will provide a way to analyze the impact of major QoS specific features on the throughput and hence can improve the performance of the network.
Effect of Carbon Black Surface Treatment on the AC Electrical Properties of PP-Based Composites
Authors: Ding Nai Xiu , Wang Li Li , Zuo Pei Yan , Li Yong , Liu Guang Ye
Published: June 2013

Carbon black was first activated by grafting and coupling respectively. Then the grafted carbon black, coupled carbon black, together with the unmodified carbon black was filled into polypropylene to prepare three kinds of composites respectively. The measurements of Fourier Transform Infrared Spectroscopy (FTIR) and alternating current (AC) electrical properties were performed on the composites. And the effect of CB activation on the AC electrical properties was analyzed. Seen from the result of FTIR spectra it can be found that different groups are bonded to the surface of carbon black after activation. For the corresponding conductive composites,it was found that the value of percolation threshold decreases and the electrical conductivity improves consequently after the carbon black activation. The influence of carbon black activation on the AC electrical properties of the composites and their variation with frequency was analyzed. The AC conduction mechanism was discussed and the conduction model was constructed based on the analysis.
Optimization of Power and Gain in Two-Stage Op-Amp by Using Taguchis Approach
Authors: Mohd Chachuli Siti Amaniah , Arith Faiz , Idris Muhammad Idzdihar
Published: June 2013

This paper presents a method based on statistical approach which known as Taguchi method. This method is used to optimize power dissipations and gain in a two-stage op-amp. Standard L27 which uses three factors and two outputs is chosen to optimize power and gain in the circuit. Simulation of the circuit has been implemented by using Mentor Graphics DA-IC. From the simulation, the results showed that total power dissipation has decreased from 3.9643 mW to 1.0345 mW. The percentage of power reduction is 73.9%. The overall gain also has been improved from 22 dB to 45.49 dB. The percentage of increment gain in two-stage op-amp is 56%.
BiCMOS Flip-Flop Design Based on NPN-NPN Feedback Driver Circuits
Authors: Yao Mao Qun , Zhang Li Bin , Ye Han Neng
Published: June 2013

based on the analyzing the characteristic of BiCMOS circuits and theory of transmission voltage-switches, we proposed a general structure of binary BiCMOS circuit based on NPN-NPN feedback driver circuit. Then we designed binary BiCMOS master-slave JK flip-flop circuit and transmission gate D flip-flop circuit base on the general structure of NPN-NPN feedback driver circuit. With using HSPICE simulation, the results show that the circuits have the correct logical function. The proposed driver circuits can be used in the design of BiCMOS sequential circuits.
The Research about La0.75Sr0.25Cr0.5Mn0.5O3-δ Application as Dense Diffusion Barrier in Limiting Current Oxygen Sensors
Authors: Wu Yin Lin , Wang Qing Hui , Zhao Hai Yan , Li Fu Shen
Published: June 2013

The fabrication and operation of a new thick film type of limiting current oxygen sensor is demonstrated that utilizes YSZ as oxygen ion conducting solid electrolytes and La0.75Sr0.25Cr0.5Mn0.5O3-δ +60% YSZ as dense diffusion barrier. The oxygen sensor shows a near linear response between 0 to 10ppm O2 in argon at 973K.
The Structure of the Hermetic Chamber in Convection-Based Tilt Sensor
Authors: Zheng Yong Hong , Peng Shi Liu
Published: June 2013

Using software of ANSYS, natural convection formed by point heat source in square and cylinder chambers were simulated numerically. The velocity field of different shape chambers was compared. The simulated results of velocity field show that, with regard to easy to produce convection, cylinder chamber is better than square one. Based on cylinder chamber, the diameter and length of cylinder chamber were set. Every technical parameter of tilt sensors with this structure all reached practical requirement.
The Mobile Node Localization Algorithm Based on Monte Carlo
Authors: Zheng Jun Gang , Wu Cheng Dong , Chen Zhong Tang
Published: June 2013

There exist some mobile node localization algoriths in wireless sensor netwok,which require high computation and specialized hardware and high node large density of beacon nodes.The Monte Carlo localization method has been studied and an improved Monte Carlo node localization has been proposed. Predicting the trajectory of the node by interpolation and combing sampling box to sampling. The method can improve the efficiency of sampling and accuracy. The simulation results show that the method has achieved good localization accuracy.
Research of Electromagnetic Flowmeter with Grounding Electrode
Authors: Gao Song , Li Bin , Yin Shi Yi
Published: June 2013

Grounding electrode electromagnetic flowmeter can reduce the loss of the measurement signal,and the conductivity lower medium can be measured if the area of the grounding electrode was increased. However, if the grounding electrode area is increased, the measurement signal will be reduced. The weight function theory of electromagnetic flow meter shows that the reason is the distribution of electromagnetic flow meter weight functions is changed by the grounding electrode, lead to the induced electromotive force every point of media in the pipeline contribution to the measuring electrode is changed. the weight function of the electromagnetic flowmeter which possesses one or two grounding electrodes was analyzed respectively, get the law of electromagnetic flowmeter output signal decreases with the increase of the grounding electrode area. Finally, the relationship of the electromagnetic flowmeter output signal and the ground electrode diameter accounted for measuring the ratio of the pipe been demonstrated. This theory and method has a certain significance to research and development grounding electrode electromagnetic flowmeter.
Analysis of Quadrature Phase-Shift Error Caused by Angular Misalignment in Moiré Linear Encoders
Authors: Ye Guo Yong , Shi Yong Sheng , Yin Lei , Liu Hong Zhong , Li Xuan , Yu Hao Yu , Lu Bing Heng
Published: June 2013

The influence of quadrature phase shift caused by angular misalignment on the measurement accuracy of two moiré linear encoders is analyzed. A mathematical model of quadrature phase-shift error is derived. The model is employed to analyze the quadrature phase-shift error in lateral-moiré-fringe-based and Vernier-moiré-fringe-based linear encoders respectively, and comparisons are carried out. The results show the nonlinearity of the quadrature phase-shift error and the relative insensitivity of the Vernier-moiré-fringe-based linear encoders to the angular misalignment.
The Applications of Sensor Network for Smart Substation
Authors: Zhang Yi Ying , Li Hui , Gao De Quan , Cao Jin Ping
Published: June 2013

With the development of internet of things (IoT), various of sensors play important roles in applications, especially in smart grid. The electrical substations usually deploy many sesors to sense the environment or control power facilities etc., such as temperature and humidity sensor, SF6 sensor etc, to organize as a wireless sensor network (WSN) to cooperate for intelligent operation. In this paper, we deploy some special sensors in the substation and design a hierarchical architecture of WSN for information collection. According to the observation and operation result, the wireless sensor network can effectively acquire the environmental object and monitor the substation assets, which can effectively improve the operation capability of substation.
Single-Resistance-Controlled Quadrature Oscillator Using CFOAs for GMI Magnetic Sensors
Authors: Zhang Lei , Pan Zhong Ming
Published: June 2013

A class of single-resistance-controlled (SRC) quadrature sinusoidal oscillator using CFOAs for GMI magnetic sensors is presented in this paper. By means of state variable, the proposed circuits are designed and analyzed which has the advantages such as noninteractive control of the oscillation condition (CO) and the oscillation frequency (FO), good sensitivity performance and minimum components including grounded capacitors. Moreover, the workability of the proposed circuit has been verified by PSPICE simulations.
Dual-Mode Quadrature Oscillator Using Current Follower Transconductance Amplifiers for GMI Sensors
Authors: Zhang Lei , Pan Zhong Ming
Published: June 2013

For designing GMI sensors, realization of current/voltage-mode (dual-mode) quadrature sinusoidal oscillator with the employment of current follower transconductance amplifier (CFTA) as the active component is presented. The proposed circuit configuration comprising two CFTAs, one grounded resistor and two grounded capacitors can simultaneously provide two explicit quadrature output currents and two quadrature output voltages. Moreover, the proposed circuit topology enjoys the advantage of independent control of the condition of oscillation and frequency of oscillation and good active and passive sensitivity performances. The functionality of the proposed quadrature oscillators has been verified by PSPICE simulations.
Synthesis and Rheological Properties of Poly (AM-TBAM-NMMAD) Random-Block Copolymer
Authors: Wu Ya Qian , Shi Xue Feng , Zhao Feng , Ying Nan Ye
Published: June 2013

Poly (TBAM-AM-NMMAD) random-block copolymer were prepared by aqueous micellar copolymerization using AIBA (V50), ammonium persulfate (J) and sodium bisulfite (D) as initiator and SDS as surfactant in the mixture solvent of deionized water. The structure of Poly (TBAM-AM-NMMAD) was characterized by solid state 13C-NMR and FTIR spectroscopy and the dynamic viscosity was measured by the NDJ-1 viscometer. The experimental results and analysis shows poly (AM-TBAM-NMMAD) random-block copolymer which had been endowed with high rheological properties was successfully synthesized by controlling the abundance of initiator based on the method of orthogonal experiment.
Using Numerical Simulation to Optimize the Design of Gas Turbine Flowmeter Sensor
Authors: Pei Jiang Hui , Su Zhong Di , Zhang Kai
Published: June 2013

In order to optimize the structural design of gas turbine flowmeter sensor, numerical simulation of internal flow for gas turbine flowmeter is conducted with computational fluid dynamics method. The computation have been carried with three dimensional modeling, high quality grid resolution, dynamic grid technique and companying with the practical application of specical boundary condition.The detailed information of velocity distribution and meter factor of gas turbine flowmeter are obtained. Compared simulation results to experimental data, the relative errors are within 2.7%.
Analysis of Radial Thickness Vibration Modes of Piezoelectric Ceramic Ring Based on ANSYS
Authors: Chen Cui Ying , Wang Li Kun , Qin Lei , Zhong Chao , Zhou Jing Jing
Published: June 2013

According to the simulation by Finite Element Analysis (FEA) for rings with different sizes, how thickness vibration resonance frequency varying as piezoelectric ring structure changing is studied. The relation between thickness vibration mode and height, thickness and radius is obtained. The bandwidth of single circle being narrow has been obtained at the same time, so the method that two high frequency piezoelectric ring oscillators are stacked in axis direction and their structure are optimized to get two times as much as the monocyclic bandwidth is researched, according to the trend of single ring.
Path Planning of Mobile Beacon for Localization Based on Distribution of Unknown Nodes
Authors: Wen Wu Song , Wang Lu
Published: June 2013

For wireless sensor network (WSN), without full consideration of the influences of unknown nodes distribution and density when planning beacons moving path, most of existing localization methods have lower efficiency. In this paper, beacon model is presented according to the theory of equal distance 3-optimal-coverage, a new heuristic path planning method is proposed for the ROI in which unknown nodes distribute randomly and the node density is limited, this proposed method can make on-line decision for the moving direction and distance over every step. Simulations show that the proposed scheme is efficient.
Application of Petrochemical Heat Equipments' State Inspection Based on Threshold Value of Infrared Image Segmentation
Authors: Cui Lin Lin , Lai Hua , Tang Yong Wang , Cao Qiang
Published: June 2013

According to the problem of petrochemical heat equipment status inspection and fault diagnosis, a method based on threshold value of infrared image segmentation was presented. Studying the infrared image segmentation based on threshold value we can get the relationship between threshold value and the target area, threshold value and the temperature. Categories of differential variance method and optimal threshold value method of the experimental results were compared, and feasibility of this method was verified.
Effect on Flame Retardancy and Mechanical Properties of PA6 Nanocomposites with Addition of OMMT and PFR
Authors: Bao Dong Mei , Liu Ji Ping , Hao Xiang Yang
Published: June 2013

The organically modiﬁed montmorrillonite (OMMT)/phosphorus polymeic flame retardant (PFR)/polyamide 6(PA6) nanocomposites were prepared via melt intercalation on a twin-screw extruder. The structure formed in nanocomposite system was investigated by Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), and Transmission Electron Microscopy (TEM). Properties such as flame retardancy, notched impact strength, tensile strength, elongation at break and flexural modulus were studied by limited oxygen index (LOI) approach, UL94, and mechanical property test. The results of the studies indicated that flame retardancy and mechanical properties of PA6 nanocomposites were all reinforced due to addition of OMMT and PFR.
Ballistic Measurement and Parameter Estimation of Ballistic Missile with Early Warning Satellite
Authors: He Lei , Qin Dong Liang
Published: June 2013

Space infrared early warning satellite is an important platform for detecting ballistic missile launch and trajectory. This paper established observation satellite motion model, and the motion state of the satellite at any time was gotten based on its initial information by numerical integration methods. According the theory of double satellites location and satellite observation data of ballistic missile, the observation trajectory of ballistic missile was fitted. The trajectory was used to build the motion model of ballistic missile, and the position, speed and other parameters of the ballistic missile can be inferred. Finally, simulation experiment was conducted.
Tolerance Analog Circuit Hard Fault and Soft Fault Diagnosis Based on Particle Swarm Neural Network
Authors: Han Bao Ru , Li Jing Bing , Wu Heng Yu
Published: June 2013

This paper presents a tolerance analog circuit hard fault and soft fault diagnosis method based on the BP neural network and particle swarm optimization algorithm. First, select the mean square error function of BP neural network as the fitness function of the PSO algorithm. Second, change the guidance of neural network algorithms rely on gradient information to adjust the network weights and threshold methods, through the use of the characteristics of the particle swarm algorithm groups parallel search to find more appropriate network weights and threshold. Then using the adaptive learning rate and momentum BP algorithm to train the BP neural network. Finally, the network is applied to fault diagnosis of analog circuit, can quickly and effectively to the circuit fault diagnosis.
Application of Adaptive Fuzzy Filter in Ultrasonic Test System
Authors: Guo Bei Tao
Published: June 2013

In order to avoid some shortcomings such as poor accuracy and low signal-to-noise ration, an ultrasonic test system based on automatic and intelligent testing are introduced. After ultrasonic signal is transmitted and received; data processing, data saving and curve displaying are performed in this test system. To solve the problem of extracting the weak ultrasonic signals from the strong noise, an adaptive filter based on least-mean-square (LMS) algorithm is designed. The convergence factor of the algorithm is chose according adaptive fuzzy control rule. Experimental results show that the filter can inhibit the noise and extract the weak signals more effectively. It also can improve the robustness, convergence speed and detecting accuracy.
Calculation of Internal Stresses of Continuous Fiber Reinforced Composite Materials in Longitudinal Loads
Authors: Li Yan Ru , Jiang Hai Bo , Cheng Zhong Qing
Published: June 2013

Solving the internal stresses of continuous fiber reinforced composite materials is a complex problem, which was studied usally by experimental or numerical calculation method. This paper proposed the equal strain method with virtual external force compensation instead of considering the shear stress in the calculation of the stress in the fiber and matrix of composite materials. By the equal strain method, the formula of longitudinal elastic modulus of continuous fiber reinforced composite materials is derived. The same result was given by other literatures with other methods, which indirectly proved correctness of the equal strain method. Further the internal stress calculation formulaes of the fiber and matrix are derived. The formulaes show that the internal stress of fiber (or matrix) is proportional to the external load and the elastic modulus of the fiber (or matrix), and is inversely proportional to the elastic modulus of the composite material.
Thermocouple Temperature Monitor System Based on PLC in Air Preheater
Authors: Shi Lei , Li Fu Sheng
Published: June 2013

This paper discusses the principle of design and performance of the air preheater thermocouple temperature monitor system, and the control system is realized with PLC and touch screen. Compared to the early device, the reliability is improved greatly, the device is free of maintenance, save so many resources, and the efficiency is improved greatly.
Design of Alarm Controllers in Detection and Alarm Systems for Gases
Authors: Zhao Yu
Published: June 2013

The paper discussed the main design philosophy of alarm controllers in detection and alarm systems for combustible and toxic gases according to content of national standard, GB 16808-2008. The content of this paper is mainly divided into two parts, program of software and development of hardware. In addition, some key points and problems which should be paid attention to in design and development stage of new product are summarized, including EMC performance, immunity to environment interference and so on.
A New Approach to Improve the Probability of Detection of Eddy Current Inspection
Authors: Zhang Wu Bo , Pan Shu Li , Huang Ping Jie , Hou Di Bo , Zhang Guang Xin
Published: June 2013

Eddy current testing is now a widely used Non Destructive Test (NDT) method for determining the size of cracks in metallic structures. The probability of detection (POD) is a key metric in assessing the effectiveness of nondestructive evaluation techniques. The POD analysis using common method is studied and modified. The eddy current sensor effective is discussed to support the proposed method. The new method is shown better result in improve the POD than the common one. The estimates of POD as a function of crack size will be valuable for future model-assisted POD study.
The Applied Research of System Subtractive Clustering RBF Algorithm in Eddy Current Testing on the Conductive Structure Defect
Authors: Liu Ban Teng , Huang Ping Jie , Zhang Guang Xin
Published: June 2013

According the problem of defect type discrimination and quantitative detection of defect depth in eddy current testing (ECT) on the conductive structure defect. The text proposes a RBF optimization algorithm based on system subtractive clustering (SISCA),first of all, according to the likelihood of the data ,it uses the system clustering method to estimate the number of clustering center, and improves mathematical model of subtractive clustering to determine the clustering scheme, then takes the minimum of the largest distance variance in the cluster as evaluation index to obtain the optimal clustering information to provide the critical initial value for training RBF network. The facts proves improved RBF algorithm takes higher accuracy and more effectiveness in the experiment of ECT.
Research on the Fault Diagnosis System for ICM
Authors: Li Zhong Nian , Zhou Lei
Published: June 2013

In the paper, researched a fault diagnosis system which is used in the ICM (Intelligent Coiling Machine)successfully, it is a kind of fault diagnosis system that uses compactwavelet neural network wavelet neural network as the intelligent core and has the PFA(Principal Factor Analysis) pretreatment function. Through innovative designing and carefully plotted monitoring ways and methods in the system, as a result the fault diagnosis rate of accuracy is high, fault-tolerant ability is strong, the processing speed is quick, and the system work safely and reliably.It has achieved the anticipated goal and the effect.
Safety Analyzed and Detection Test of Unexploded Subprojectiles by Means of Some Metal Detector
Authors: Cai Jun Feng , Fu Xiao Zhong , Yi Jian Zheng
Published: June 2013

Unexploded Subprojectiles is a serious and prevalent environmental problem currently facing us. In this paper, the safety of Unexploded Subprojectiles detection and the detection objective and detection environment were analyzed. the Unexploded Subprojectiles detection experiment was studied. The research indicates: there is a certain effect to detect Unexploded Subprojectiles where is in the non-magnetism soil and under shallow earth. But there is big influence in depth of hidden objective, and the dimension of real objective cant be reflected.
The Research of Signal Processing in Ultrasonic Nondestructive Testing and Evaluation
Authors: Ai Chun An , Wang Qiao , Xu Zhi Gao
Published: June 2013

The development of signal processing technology not only improves the reliability of qualitative and quantitative ultrasound detection, but also promotes the sensitivity and precision. This paper introduces the new progress of signal processing technology in application of Ultrasonic Nondestructive Testing, including the basic principle, characteristic and localization of Wavelet Transform, Adaptive Filter Technique, Artificial Neural Network and Support Vector Machine application in Ultrasonic Testing, and the trend of development in the future.
Constant-Stress Accelerated Life Test with Competing Risks under Progressive Type-II Hybrid Censoring
Authors: Shi Yi Min , Jin Li , Wei Chao , Yue Hong Bo
Published: June 2013

In this paper, we consider a constant-stress accelerated life test with competing risks for failure from exponential distribution under progressive type-II hybrid censoring. We derive the maximum likelihood estimator and Bayes estimator of the parameter and prove their equivalence under certain circumstances. Further study of the estimators indicates that missing of failure modes would result in overestimation of the mean lifetime. Finally, a Monte-Carlo simulation is performed to demonstrate the accuracy and effectiveness of the estimators.
Fault Prediction Based on Data Fusion
Authors: Tian Hai Lei , Li Hong Ru , Xu Bao Hua
Published: June 2013

The performance of hydraulic pump will directly affect the normal work of the entire hydraulic system, so it is essential for its condition monitoring and fault prediction. It collects vibration signal and pressure signal for hydraulic pump which degenerates from the normal state to loose slipper state. It uses wavelet packet to decompose energy of frequency area in order to get fault feature vectors and builds support vector machine prediction model for feature vectors, then predicts possible fault by D-S evidence theory. The experiment results show that the method can effectively predict fault for hydraulic pump.
Study on Method of Reconnaissance Effect Simulation for Infrared Imaging Equipment
Authors: Hu Zheng Dong , Yang Tao , Tang Xue Mei , Xiang Chao
Published: June 2013

With the extensive use of infrared imaging reconnaissance equipment on the battlefield, recently how to simulate the reconnaissance effect of infrared imaging equipment has become a key issue that urgently needs to be solved in warfare simulation. To solve this problem, a method of reconnaissance effect simulation for infrared imaging equipment under warfare simulation is presented in this paper, which divides the entire reconnaissance process into a series of phases of the search, detection and recognition, confirmation and positioning. For the needs of a higher degree of confidence without too many complex calculations and parameter input, the established model is mainly dependent on the equipment tactical and technical performance indicators. Comparing the calculation results with the experimental data shows that the calculation error is smaller and this method presented has a good prospect in the warfare simulation.
Research on the Electronic Differential Control Strategy of Electric Vehicle
Authors: Lu Chun Guang , Xu Mei Si , Li Cheng Qun
Published: June 2013

According to the electric vehicle driven by dual wheel hub motors, the article analysed the principle of mechanical differential. And the article used the principle of differential under the same force of mechanical differential, put forward a new adaptive control strategy of electronic differential based on torque control. According to torque control£¬the controller controls the speed of the drive motors on both sides, which achieves the aim of the adaptive electronic differential.
Design of the Vehicular Eletro-Optical Tracking Turntable Servo System and the Research on its Tracking Control Scheme
Authors: Ji Dong , Wang Hua Pei , Guo Qing , Lu Qing
Published: June 2013

In order to realize the high precision tracking control of the vehicular eletro-optical tracking turntable with the car bodys vibration, it is necessary to design a high performance turntable servo system and a set of high precision eletro-optical tracking control scheme. In this paper, a digital servo system is designed, which has the control platform based on PC104 processor, has the torque motor as the actuator, has the gyro as the inertial velocity measurement tool and has the high precision encoder as the position measurement tool. Then, the gyrostabilized double speed loop control algorithm with disturbance observer compensating is designed to realize a good inertial velocity stability performace; and, a set of eletro-optical tracking compound position loop control scheme based on the target-missing quality data processing, the segmented PID control and the acceleration lag compensating control is proposed to enhance the eletro-optical tracking precision. The result shows that the tracking turntable based on the control technology designed in this paper is reliable, responses quickly, has a good speed stability performance and a high eletro-optical tracking precision performance.
Optimization Analysis of Structure Parameters for External Rotor DSPM Motor
Authors: Liu Hua , Wang Wei Jun , Mao Long Bo , Dai Qiang
Published: June 2013

The external rotor doubly salient permanent magnet (DSPM) motor which included permanent magnet in the rotor tooth was designed. The two-dimensional model of the motor was established and several structure parameters were analyzed by Ansoft electromagnetic analysis software. The relationship of the structure parameters and the average electromagnetic torque and winding induction potential was obtained. The simulation results show that smaller or bigger stator yoke depth and the pole thickness is not good for the motor efficient operation.
Digital Machining Simulation for Francis Hydro Turbine's Blade
Authors: Yin Yan Chao , Wu Lei
Published: June 2013

In order to high-quality manufacture the hydro turbine blade efficiently, a series of innovative digital techniques have been developed. It includes 3-D modeling based on machining requirement, multi-axis tool path planning and generating, tool axis orientation for multi-axial NC machining of blades, machining simulation environment establishment, computer simulation for machining of a large blade to verify the gouges and collisions between machine tool, blade and fixtures. The techniques of multi-axis digital machining simulation for large-size blades can be directly applied into digital simulation processing of other sculptured surface parts, and it will completely change the traditional design and manufacturing process of turbine.
Tool Path Generation for Local Interference Region Machining of Triangular Mesh Model
Authors: Yu Meng , Huang Chang Biao , Jiang Kai Yong , Liu Bin
Published: June 2013

In this paper, a novel method is proposed for identifying local interference region and generation iso-scallop tool paths based on triangular mesh model for 3-axis ball-end milling. With our method, the principal curvatures and directions at vertices have been computed first and a recursive merging algorithm for segmenting local interference regions is developed. In addition, a method of generation tool path with constant scallop height for local interference region is also presented. Some illustrative examples are tested that indicate the feasibility and availability.
Simulation Research on the Shift Schedule in the Auto with Automated Manual Transmission Based on Cruise Gear Shift Program
Authors: Qin Hao , Long Shao Xiong , Yu Kai
Published: June 2013

Shift schedule has an important influence on the performances of the auto with automated manual transmission (AMT). It will affect fuel economy, dynamic and emission performance of vehicle. According to the numbers of the control parameters, shift schedule can be roughly divided into threemain categories: single parameter, two parameters, and three parameters schedule.This paper introduces how to simulate and generate the shift schedule in the auto with AMT on the basis of two parameters shift schedule which is widely used in the real auto engineering by using the Gear Shift Program (GSP) module of the Cruise software.The result shows that this method could generate the shift schedule accurately and quickly.These works could be used in the effective calibration of transmissions and shorten thevehicle development cycle.
Structure Design of Transmissive Switch-Zoom Infrared Systems
Authors: Jia Qing Lian , Song Li Wei
Published: June 2013

A new optical structure design method was proposed by forward-object lens, zoom lens, focus lens and behind-object lens with transmissive switch-zoom infrared system. And an alignment method of the above structure was proposed to assure the imaging precision. The larger caliber forward lens structure was designed to immovably axial with system axis, while the zoom lens structure was designed to three different structures by actual optical design for reducing system dimension. The focus lens structure was absolute configuration for the stabilization during focus. The rear lens structure was also designed to small radial clearance. A through-shaft type tooling was proposed to cooperate to adjusting and confirming of the system optical axis by exact boring machine. Experiment results showed that the alignment method can be assured precision and economized cost.
New Design of Reduction Device of Column Electric Power Steering System
Authors: Wu Yu Long , Li Cheng Qun , Dong Xiao Lei
Published: June 2013

EPS is the abbreviation of electric power steering system and reduction device is one of the key parts of the EPS. It determines whether the steering system works normally. This paper studies the deceleration mechanism of EPS and in accordance with its assistance characteristic, designs a new deceleration device that Cycloid steel ball planetary reducer, and gives the specific design and implementation of the program. Combined with steering portability needs, this paper gives the specific reduction ratio calculation and the deceleration mechanism design.
Breaking Deceleration Control of Urban Rail Vehicle Based on Smith Predictor
Authors: Zhang Meng Nan , Xu Hong Ze
Published: June 2013

Stopping accuracy is a significant guarantee of the safety of the train's operation. It is mainly impacted by the performance of the electric-pneumatic braking system and the control mode of the braking system. In this paper, the braking deceleration control mode is adopted and a braking model of the urban rail vehicle reflecting the principle of the electric-pneumatic braking system is derived. Dynamic characteristics of the deceleration and dead time of the system are also considered in this model. Furthermore, the impact of the dead time is also analyzed in this work. Based on this nonminimum phase system, a conventional PID controller with the Smith predictor is proposed to control the deceleration of the vehicle. Simulation results verify that this method not only tracks the reference breaking deceleration but also effectively improves the stability of the braking system and the comfort level of the urban rail vehicle.
Genetic Algorithm Tuning PID Control of Magnetic Powder Clutch
Authors: Wu Xiao Gang , Liu Rui Xue , Ding Nan Nan
Published: June 2013

The linear relationship between transfer torque and exciting current of magnetic powder clutch easily achieves to the electronic control and are widely used on the passenger cars. This article established the drive circuit model based on the experiments of excitation current transfer torque for magnetic powder clutch. Aiming at the nonlinear problems of the drive circuit, the article designed a current controller of magnetic powder clutch, which used method of genetic algorithms tuning PID control parameter. The simulation results showed that the drive control dynamic based on the genetic algorithms tuning PID was better than the traditional PID control, and the system had better adaptability.
Design and Implementation of the AMT Data Acquisition System Structure and Function
Authors: Cheng Yu , Zhao Hong Wei , Wang Song , Lv Wei , Sun Tao
Published: June 2013

Based on electro-hydraulic control automatic transmission, in order to meet the shifting actuator control effect high response speed, high control accuracy requirements and real-time, accurate acquisition transmission work state. According to the proportional pressure solenoid valve, proportional flow valve response curve and rated operating parameters, designed the hardware control circuit. For the acquisition of automatic transmission shift the implementing agencies cylinder pressure, hydraulic oil temperature and transmission input, output shaft speed, designed the hardware circuit, according to the nominal operating parameters for each sensor. Acquisition speed and accuracy requirements for the quality of the output signal of the respective sensors and control system, designed for each of the output signal of the signal processing and analysis circuit. The bench test the experimental results show that the data acquisition system designed in this paper can meet the requirements of the control system for real-time and accuracy.
Research on the Real Time Simulation of HEV Motor Pre-Charge Using an Embedded Control System
Authors: Dong Chao , Li Jun
Published: June 2013

Power battery in the HEV normally has a high capacity. Therefore during the start-up procedure of HEV motor, pre-charge phase is essential in order to reduce the impact of high current. In this paper, we build a HEV motor pre-charge model then deploy it on cRIO embedded control system to simulate the whole process with high real time. Finally the paper tests some typical fault conditions which demonstrate great benefits.
Path Optimization of Spray Painting Robot for Zigzag Path Pattern
Authors: Zeng Yong , Ni Xiao Hua
Published: June 2013

in order to solve the coating uniformity of common border between two patches based on zigzag path pattern, an algorithm of zigzag path is developed. In this paper, a complex free surface is divided into several patches based on the constraint of coating thickness error. Based on optimized parameters of spray path on a patch, an algorithm that using variable path parameter is used to optimize zigzag path pattern by modifying the planning direction of paint gun path when satisfy parallel condition. The results of simulations have shown that the path planning algorithm achieves satisfactory performance.
The Study on the Communication of the Multi-Robot Polishing System by the ACO Mode
Authors: Yu Miao , An Xin , Ji Jing
Published: June 2013

This paper compiles the program to control the multi-robot polishing system by the ACO (ant colony optimization) mode and adopts the communication protocol between the robots of multi-robot polishing system. Then, based on the multi-robot system which is made up of the MOTOMAN - HP3 serial robot and NPT800 parallel robot, the mutual communication can be accomplished by two robots and the robot position and status information can be transported with programming of the blackboard structure. The experiments show that the communication protocol can enforce communication of the computer between the multi--robot. It can achieve the stability and higher instantaneity. It has met the communication needs of the multi-robot.
Design and Development of the Trunk Spraying Machine
Authors: Liu Jing , Tang Jun , Yao Chen
Published: June 2013

In order to protect the trees, prevent pests and frostbite, designed and developed a medicine which can spray liquid medicine on tree trunks. This paper expounds the working principle of trunk spraying machine, and introduces the components of manipulator structure in details. The manipulator with four degrees of freedom, including move up and down, horizontal direction stretch and fold, sway back and forth, sway left and right. Prototype tests show that, this machine can be applied to different shape of trees. It just takes about 20 seconds of the spraying process, so the machine can greatly reduce labor intensity and improve work efficiency.
Proposal of Noncontact Operation Robotic Hand Using Permanent Magnetic Suspension
Authors: Xu Zhong , Sun Feng , Jin Jun Jie , Oka Koichi
Published: June 2013

This paper proposes a noncontact operation robotic hand using magnetic suspension system. This robotic hand will consist of a noncontact catching part and four movable fingers. The noncontact catching part will be realized by a permanent magnetic suspension system, and will be used to pick up and catch the metal body. There is a permanent magnet on the top of each moveable finger, which operates the suspended metal body without contact. This paper focuses on the feasibility and performance of the noncontact operation using the movable fingers with permanent magnets.
Automatic Button Cell Sorting Manipulator System Research Based on Visual Servo Control
Authors: Sun Ling Yu , Yuan Guang Ming , Zhang Jun , Liu Zhe , Sun Li Xin
Published: June 2013

Automatic machine vision-based manipulator used for button cell sorting has high academic value. Firstly, a detailed analysis of the visual system, using an image-based visual servo control method, is provided, so as to establish a set of button batteries automatic sorting manipulator platform. the detail composition of this platform is introduced in this paper. Through analysis of PID control method, a mathematical model is established, and its motor control is simulated.Experimental results show that, the platform of an automatic manipulator system has char high accuracy and higher real-time characteristic.
Synthesis and Micro-Wave Absorption Properties of BiFeO3 Coated Fe Nanocapsules
Authors: Shi Gui Mei , Lu Da Wei , Zhang Yan
Published: June 2013

BiFeO3 coated ferromagnetic Fe nanocapsules is synthesized by arc-discharging method. Typical HRTEM images show that the nanocapsules form in a core-shell structure. X-ray photoelectron spectrum (XPS) and X-ray diffraction (XRD) reveal that the core is ferromagnetic Fe, while the shell is BiFeO3/Bi2Fe4O9.The reflection loss R of less than -10 dB was obtained for the whole frequency within the 2-18GHz range by choosing an appropriate layer thickness between 1.0mm and 7.0mm. An optimal reflection loss of -21.5 dB was reached at 10.6 GHz with an absorber thickness of 2.0mm. It is worth noticing that the BiFeO3 coated Fe nanocapsules have two absorption peaks below -10 dB at each thickness layer ranging from 4.0nm to 7.0nm, which means the composites nanocapsules absorber simultaneously are able to absorb microwaves in different band of several GHz.
Research on Kinematic of the Wheel-Legged Robot Based on Uneven Road Surface
Authors: Peng Ping , Zhang Xiao Jun , Zhang Jun , Liu Zhe
Published: June 2013

A new type of wheel-legged mobile robot is presented in the paper, which is mainly used for early toxic gas leakage warning and disaster relief in the field of wild environment. The paper first presents the structure feature of the new wheel-legged mobile robot. According to the structure of the robot, the kinematics model about robot moving on the smoothing-riding surface is built. On this basis, considering the effects of the disturbance by uneven road surface the paper carries out the robots kinematics analysis. To simulate the result of robot moving on the real road surface, the paper researches on the robots kenimatics by inputing some typical ground driving to the robot. The result of the simulation experiment shows that the robot pose error is more increasing. So the influence of ground disturbance to robot should be took into account in designing the control symstem, which can decrease the pose error and make robot move more accurately.
Complex Paper Disease Detection Based on Probabilistic Hough Transform
Authors: Qi Xing Guang , Dou Dan Dan , Zhang Hai Lun
Published: June 2013

Although advantages of traditional Hough transform of such Good robustness and anti-interference have been found in the process of detection of complex paper diseases such as Streak, fold, however, quantity calculation has imposed limitation on the application of this method in dealing process demanding high instantaneity. Probabilistic Hough Transform fits in a straight line by approach of Hough transform. The approach of selecting fitting points by random drawing and combination with meter counter and output a boundary line where random drawing points locates on condition that such points satisfy limitation of threshold value which has been pre-setted is able to reduce the calculation and period of algorithm operation therefore fitts detection of complex paper diseases demanding high instantaneity.
Synthesis of CoPt Nanoparticles by Reduction of Co(CH3COO)2 and Pt(acac)2
Authors: Shao Hui Ping , Wang Zhi , Lin Tao , Sun Sen
Published: June 2013

CoPt nanoparticles with an average size of 2.8 – 4.7 nm were synthesized by reduction of non-toxic precursors Co(CH3COO)2 and Pt(acac)2 using trioctylamine as a solvent at reaction temperature of 260 – 280 °C. The X-ray diffraction pattern showed that as-prepared particles have a disordered face-centered cubic structure while annealing at 700 °C caused them to be an ordered face-centered tetragonal structure. The annealing increased magnetic coercivity of the particles from zero to 772.4 Oe and their saturated magnetization from 15.04 to 27.95 emu/g.
Investigation of Factors Influencing Calibration Accuracy of Camera
Authors: Wang Jian Hua , Wu Yu Ping , Yang Zhao
Published: June 2013

Camera calibration is the basis of vision-based 3D measurement. While many calibration methods have been proposed, the problem encountered in the practice of camera calibration is how to get accurate calibration parameters, which is seldom involved in references. This paper is focused on investigation of main factors influencing calibration accuracy, including manufacturing error of calibration rig, extracting error of control point and their combination. Based on the popular calibration method, simulation experiments are conducted at different error level, and the results show that the extracting error of control point has greater effect on calibration accuracy than manufacturing error of calibration rig. The manufacturing tolerance of calibration rig and extracting tolerance of control point is suggested to satisfy usual machine vision application.
Study of Motion Detection Technology Based on Davinci Platform
Authors: Yuan Shuai , Zhang Guo Yun , Wu Jian Hui , Guo Long Yuan
Published: June 2013

A motion object detection method is presented based on Davinci platform. This paper adopts color histogram algorithm to detect moving target, which is operated on TMS320DM6446. In continuous frames, probability distributions of both foreground pixel and background pixel are counted separately to build color histogram. Background probability can be computed based on gauss model. After background separation, we can use median filtering to suppress image noise, detect connected domain, converge foreground pixels to make up of moving object regions and mark them. The results show that the method presented has good accuracy and quick speed for realtime application.
An Improved Suppressed FCM Algorithm for Image Segmentation
Authors: Lan Hong , Jin Shao Bin
Published: June 2013

Fuzzy C-Means clustering(FCM) algorithm plays an important role in image segmentation, but it is sensitive to noise because of not taking into account the spatial information. Addressing this problem, this paper presents an improved suppressed FCM algorithm based on the pixels and the spatial neighborhood information of the image. The algorithm combines the two-dimentional histogram and suppressed FCM algorithm together. First, construct a two-dimentional histogram instead of one-dimentional histogram, which can better distinguish the distribution of the object and background for noisy images. Then determine the initial clustering based on two-dimensional histogram. Last, provide a new way to determine the suppressed factor and use the improved FCM algorithm to realize the image segmentation. Experimental results show that the improved algorithm is effective to improve the clustering speed, and can achieve better segmentation results.
Moving Objects Detection and Speed Estimation in Intelligent Surveillance System
Authors: Xi Zhi Hong , Dong Guang Hui
Published: June 2013

In order to solve the problem of highway intelligent video surveillance system for effective monitoring of vehicle operating conditions, a fast block background modeling method is proposed in the framework for intelligent video surveillance system. First using statistical histogram to build the background model of the video surveillance system, second using background subtraction method to locate the moving target area, at last using displacement of the minimum exterior rectangle centroid of the moving target between two frames to calculate moving target speed, without the aid calibration. Experimental results show that the proposed method exhibits its superiority in processing time, the time of building background model through 100 frames is 3.8s. The proposed method has good practical value used in intelligent video surveillance.