bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Technology of Thrust Asymmetry Lateral Compensation for Large Aircraft
Authors: Ji Meng , Jiang Ju , Xue Wen , Lin Zhuo Xun
Published: November 2011

Thrust asymmetry is dangerous for aircraft, especially in the phases of approach and landing. This paper proposes a new technology to compensate the thrust asymmetry in lateral of large aircraft. The dynamic characteristics of aircraft with asymmetric thrust are firstly analyzed in the paper. Then, the controllability conditions and balanced flight attitude in the case of thrust asymmetry are studied. Based on the mathematic model of Airbus 300, a thrust asymmetry lateral compensator is designed for the phases of approach and landing to ensure the safety of approach and landing. Numerical simulation results show that the designed compensator (control law) can compensate the asymmetric thrust very well.
The Study of the Multi-Body System Theory on Basis of CNC Milling Machine Error
Authors: Zhu Cheng Jun , Qin Qi Shu , Bao Peng Er
Published: November 2011

CNC machine, especially CNC milling machine, is the main production equipment in the industries of machinery, iron and steel, automobile manufacturing and so on. However, the errors are the main constraints to the processing quality and the precision measurement of CNC machine. Based on the multi-body system theory, the article models the error of Siemens CNC milling machine. In terms of the analysis of the error model, it is argued that the processing precision of CNC milling machine can be improved through controlling and compensating the error in the process of installation and manufacturing.
Research on Linear Motor for Linear Compressor
Authors: Wang Wei , Xia Yong Ming
Published: November 2011

A novel moving-magnet linear motor was introduced which can produce high-frequency short stroke reciprocating motion, and it’s suitable to apply in linear compressor. The equivalent magnetic circuit model was established and the expression of driven force was given, then the impact the motor parameters made to motor performance was analyzed. The motor’s finite element model was established, the features of the air-gap magnetic field were studied, and the impact the length of the permanent magnet made to the motor stroke was analyzed. The foundation of the motor’s further optimization was laid by the results.
Simulation and Parameters Tuning of Second Order ADRC Controller in Simulink
Authors: Ma You Jie , Yu Yang , Zhou Xue Song , Li Chao , Liu Si Jia
Published: November 2011

Based on studying Active Disturbance Rejection Control(ADRC)technology, with MATLAB / SIMULINK as simulation platform, a simple second order system as a controlled object, Specifically discussed the establishment of system module using simulink model.By the way of designing system functions for dynamic algorithms such as Tracking Differentiator and Extended State Observer, Not only can change the system parameters and simulation results can be observed after parameters changed, the simulation process becomes simple and effective. And the relationship between parameters of ADRC and the plant dynamic characteristics are analyzed when the parameters are changed, where some principles for parameters tuning of ADRC and effective applications are provided. Finally, Through simulation examples shows that the method is practical and effective.
The Review of Technology of Power Quality Disturbances Generator
Authors: Zhu Wu , Tu Xiang Cun , Qu Chang Chun
Published: November 2011

To test the Electric equipment’s immunity to voltage disturbances, a special power quality disturbances generator was needed. According to the principles of power quality disturbances generator, they were divided into the following types: the form of arbitrary waveform generator adds amplifier, the combination of transformers in series or parallel mode, regulating transformer tap position, thyristor controlled reactor, AC/DC/AC converter and the other traditional methods in this paper. This paper discusses the main technology characteristics of implementations in detail, describes different kinds of equipment using occasions, summarizes the advantages and disadvantages of all principles and points out the using prospect and promotion of all kinds generators in future.
The New Elman ANN Application in Accuracy Improvement of Robot Navigation and Obstacle Avoidance Technology
Authors: Du Xiao Kun
Published: November 2011

This paper, through the analysis of the limitation of the ultrasonic sensor in the underground drilling robot which obstacle avoidance, puts forward the solving scheme, emphasizes the compensation of temperature and humidity to ultrasonic sensor, attempts to use Elman feedback neural network approach function. Elman network hidden layer adopts Tan-sigmoid transfer function, and output layer transfer function adopts linear function, which guarantee that the network can approaches wanton function with wanton precision once it has enough layers. Proved by experiments that the measure precision of ultrasonic ranging raises two orders of grade after carrying on the temperature and humidity compensate, improves the working efficiency of obstacle avoidance in the system greatly and the ability of drilling robot’s obstacle avoidance.
Research on a New Type of Lithium Battery String Equalization and Management System
Authors: Wang Hao , Shao Ding Guo , Xu Lu
Published: November 2011

Lithium battery has been employed widely in many industrial applications. Parameter mismatches between lithium batteries along a series string is the critical limits of the large-scale applications in high power situation. Maintaining equalization between batteries is the key technique in lithium batteries application. This paper summarizes normal equalization techniques and proposed a new type of lithium Battery Equalization and Management System (BEMS) employing the isolated DC-DC converter structure. The system is integrated both equalization functions and management functions by using distributed 3-level controlled structure and digital control technique. With this control method the flexibility of the balance control strategy and the compatibility for different battery strings are both improved dramatically. The experimental results show optimizing equalization, efficiency and the battery string life span has been extended.
New Idea of the Multilevel Leakage Protection in Underground LV Distribution Networks
Authors: Liang Yi Long
Published: November 2011

A new idea of multilevel leakage protective system is proposed in this paper in accordance with the deficiencies covered in present leakage protective system used in underground low voltage distribution networks. The leakage is especially analyzed, which occurred from transformer secondary to general switchgear or from general switchgear to branch switchgear. The new leakage protective equipments which based on the new idea are also introduced here. Finally equipments are tested. The measuring results show that equipments can form a leakage protective system, the selective leakage protection of which has no time difference. Consequently, the level of safety for underground LV distribution networks is greatly improved.
Design for the High-Rise Cable-Suspended Rescue Robot
Authors: Luo Kang , Deng Cheng Zhong
Published: November 2011

Presented in this paper are a prototype design for a cable-suspended robot mechanism with two dimensions of free movement, a position feedback strategy, and an embedded control system. In addition, a novel positioning metrology is also proposed such that the Jacobian Matrix can be formed directly through measurement, which contributes greatly to the robot path planning. This cable-suspended robot can be applied to firefighting in high-rise buildings as a novel approach to providing rescue capabilities beyond those of traditional aerial ladders.
Research of Redundancy Management on Fight Control Computer for Unmanned Aerial Vehicle
Authors: Liu Lu , Chen Xin , Cao Dong
Published: November 2011

Redundancy technology is very important to improve the reliability and fault tolerant of redundant flight control computer for unmanned aerial vehicle. The key technology is redundancy management strategies and methods. The redundancy management strategies and methods are researched based on hardware redundancy and software management for the sample redundant flight control computer The redundancy management strategies make full use of the advantages of distributed systems and the CAN bus transmission characteristics, and solve the problem of fault diagnosis and fault treatment and system reconfiguration. Results show that the strategies meet the design specifications of application requirements.
Motion Consistence and Textural Coherence based Error Concealment Algorithm for Corrupted Macroblock
Authors: Chen Jing , Cai Can Hui
Published: November 2011

In this paper, an error concealment algorithm for lost macroblock (MB), named motion consistence and textural coherence based error concealment algorithm (MCTC), is proposed to meet the requirement of video transmission over error-prone channels. A directional predicted motion vector (MV) set is setup by using the motion consistence between MV co-located in reference frame and the neighboring MVs of the lost MB. To find out an optimal MV from this candidate MV set, a textural coherence based boundary matching (TCBM) criterion is proposed. The experiment results show that the MCTC outperforms the state-of-the-art video error concealment methods in both objective and subjective visual quality.
Hybrid Genetic Algorithm-Based Production Planning for Steel-Making and Continuous Casting Process
Authors: Zhu Dao Fei , Wang Hua , Wang Shi Bo , Xu Jian Xin
Published: November 2011

Based on the just in time idea, a production planning model is established in the steel-making and continuous casting. In the model, with sequence casting constraint, the objective is to minimize the operation conflict time and the deviation time of punctual delivery. Then a hybrid GA combined the backward inferring algorithm with GA is presented to solve the model. As the delivery time, the start time of each charge on each working stage is obtained by the backward inferring algorithm. GA is applied to search the suitable start pouring time, select the reasonable operation time and transportation time, assign the feasible processing unit, and evaluate the optimization production plan. The test with the production data in a steel plant shows that the model and algorithm can draw quickly a high-quality and performable production plan, and the average staying time of the production plan is about 7% shorter than that in a practical process.
Calibration System Development of Electronically Controlled Engine Based on CCP
Authors: Tang Lan , Xie Lin , Wang Ming Wen , Gan Hai Yun
Published: November 2011

This paper introduces CCP(CAN Calibration Protocol) basic principle, comumunication mode, work mode for ECU calibration, and design a calibration system based on CCP. It has many general-purpose features: such as high communication speed and excellent compatibility, and provide custom-made function aim at different demand of users.
Decomposition of Cefotaxime Sodium Wastewater by Ultrasonic Fenton Method
Authors: Luo Kang Bi , Ning Ping , Li Hu Ping , Chen Juen
Published: November 2011

The possibility of decomposition of cefotaxime sodium wastewater by ultrasonic Fenton method was discussed in this paper. The influence of various experimental parameters on the decomposition of the wastewater was investigated. The experiment results showed that 44.1% of COD can be removed and the value of BOD5/COD increased up to 0.99, revealing that the combined ultrasonic Fenton technology is an effectively method to treat the cefotaxime sodium wastewater.
Design and Implementation of a Computer Vision Based Inspection System Using CUDA
Authors: Shi Yan , Li Ai Guo , Wang Lin
Published: November 2011

In the production process of electronic Instrument Clusters (IC) used in automobiles, a need for automated inspection of dynamic characteristics is identified. An inspection system based on hardware-in-loop emulation and computer vision using Computer Unified Device Architecture (CUDA) is proposed. The system generates network signals that emulate a real vehicle, sends the signals to an IC to turn it into various work conditions, captures the IC’s response into a graphic processing unit for real-time computer-vision processing and records inspection results into databases. An implementation of the design and performance analysis is provided.
The Experiment Research on Applying Air Source Heat Pump in Boiled Water Machine
Authors: Shi Wei Xiu , Li Wei Yi , Pan Li Sheng , Zhou Zhi Hua
Published: November 2011

Under the situation of energy crisis, air source heat pumps are paid more attention recently. In terms of energy saving, the feasibility and performance of boiled water machine with air source heat pump are studied by experiment in this paper. The results are as follows: the best outlet temperature of heat pump is 55°C in winter, and that is 65°C in other seasons correspondingly. Electromagnetic heater is used as the accessorial heating method, which can heat water to 95°C so as to be fit to drinking. Moreover, the energy saving effect of the unit is remarkable. At the end of the paper, the preliminary conception of structure and automatic control is proposed.
Research on Islanding Detection for Grid-Connected Inverter and Protection Criterion Based on Fuzzy Clustering Analysis
Authors: Dong Jie , Rong Ya Jun
Published: November 2011

On the basis of introducing the causes and hazards of islanding, the paper classifies and generalizes the testing methods used currently about islanding. It is shown that applying single method to detect islanding will bring some wrong judgments. It is difficult to determine the protection thresholds by a single detection method, which will decrease protection sensitivity and result in system losses. This paper studies a method based on fuzzy clustering, which integrates variations of voltage amplitude and frequency change, mutations of current phase and voltage phase, as well as formation of voltage harmonics and so on, and determines the formation of islanding and the appropriate protection criterion.
Effect of Magnetic Circuit’s Structure Parameters on Torque-Speed Characteristic for Electromagnetic Damper
Authors: Wang Yan Fang , He Lin Lin
Published: November 2011

The electromagnetic damper studied in this paper belongs to a special kind of coreless generator, which is primarily used for the energy absorption and dissipation in space docking mechanism buffer system. The parameters of magnetic circuit tructure which determines the air-gap flux density are important factors in affecting damping torque. Three-dimensional models are built based on MagNet of Infolytic corporation in this paper. The effects of structure parameters of magnetic circuit such as magnet material, magnetic pole-pairs, rotor thickness on the torque-speed characteristic are researched. The analysis results show that the damping torque is proportional to the square of the amplitude of the fundamental component of the air gap flux density, rotor thickness respectively, the relationship of the torque-speed ratio with the magnetic pole is neither directly proportional nor inversely proportional.
Research on Transient Stability Simulation of Ship Power System
Authors: Wang Hao Liang , Zhang Chun Lai , Kong Xiang Nan , Zhang Hua
Published: November 2011

Based on the SIMULINK tool of MATLAB, the paper researches the ship power system, the research includes: load suddenly increased or decreased when one single generator is running, generators’ running in parallel, load suddenly increased or decreased when two generators are running in parallel. Through the analysis of the different work condition, the paper researches the transient stability of the ship power system.
The Study on the Fuzzy Control Algorithm for Main Steam Pressure Control of Circulated Fluidized Bed Boiler
Authors: Wang Zhong Jie , Han Ning , Wang Jia
Published: November 2011

The main steam Pressure is one of the most important guidelines on Circulating Fluidized Bed Boiler (CFBB) operation quality and an important part in control system of CFBB. However, It is very difficult to establish the exact mathematical models of controlled objects because the combustion system of circulating fluidized bed boiler is an object that has many features: distributed parameters, nonlinear, time-varying and long time-delaying. it is unfavorable to control it with traditional controller. Therefore , In this paper fuzzy controller is used in controlling main vapor pressure systems of CFBB, and the fuzzy cascade control system is designed. In computer simulation, the fuzzy cascade control system exert stably, and has perfect control effect to main vapor pressure systems of CFBB.
Simulation Research of AC Servo Driver Speed Adjusting System Based on SVPWM
Authors: Yuan Xiu Ping , Fang Zu Hua , Li He Yi
Published: November 2011

An AC servo driver speed adjusting system based on space vector pulse width modulation (SVPWM) is put forward. The principle of SVPWM and its software algorithm based on digital signal processor (DSP) are introduced in detail, and the structure of the system is designed. The simulation model of the system is built in Matlab, the simulation research provides theoretical basis for AC servo driver control performance.
Study and Application of ESD Generator Modele
Authors: Wang Hui , Tian Wei
Published: November 2011

Phenomenon of electrostatic hazards is becoming increasingly prominent with wide application of microelectronic elements. Electrostatic Discharge (ESD) is an extremely complex process, which is not only related to the materials, the object shape and the value of discharging circuit resistance, but also always involved in very complicated process of gas breakdown, so ESD is also a stochastic process which is difficult to repeat. According to the request of standard IEC61000-4-2, simulation circuit of the equivalent Human-Metal Model is established, discharging process is simulated and analyzed, and the influence laws of circuit parameters and distribution parameters for ESD current waveform are obtained. Thus the structure of discharging circuit and element parameters can be determined, test results can be verified to some extent, and the characteristics and influencing factors of ESD process can be known better. Simulation results show that waveform parameters are all within the range of standard errors, which proves that the design of model parameters is correct, the analysis of ESD process is reasonable.
A Method for Modeling and Simulation of Differential Drive Mobile Robot Localization Based on EKF Multisensor Fusion
Authors: Bao Bi Zhen , Yang Ping , Cao Hu Wen
Published: November 2011

A method was proposed based on principle of EKF (extended Kalman Filter) state estimation to improve the localization precision of differential drive mobile robot. The robot position was estimated by Multisensor fusion of Odometer and laser, which kinematics model, the robot sensor perception model and the sensor error model were presented. The models were introduced into the state estimation and covariance matrix update equation of EKF with match convergence condition and nonlinear error correction covariance matrix.The specific iteration equation was acquired.The simulation results demonstrate the approach of modeling and fusion is accurate and validity.
Simulation Study of Variable-Frequency Speed-Regulation Vector Control System of Asynchronous Motor
Authors: Xu Bo Qiang , Zhang Xiao Ling
Published: November 2011

Vector control technology is regarded as a kind of controlling manner of AC asynchronous motor and it has already become the first method of the high-performance variable-frequency speed regulating system. According to the basic principles of induction motor vector control, this paper constructs simulation model of rotor magnetic field oriented vector control system based on the MATLAB software. The paper analyzes the operation of motor on the basis of mutation of a given speed and sudden load. The simulation result including the oscillogram speed, torque,three phase current and two phase current were presented and analyzed. Results show that it has good dynamic performance, and it realizes the decoupling control system.
Research on the Pollution Diffusion Regularity near Sewage Outlet Areas in Yuncheng Reach of the Fen River
Authors: Hou Jian Hua , Feng Min Quan , Xing Xiao Peng , Hou Zhen Hua
Published: November 2011

The purpose of this paper is to find the pollution diffusion regularity near sewage outlet area of Yuncheng reach of the Fen River. A 2-D water hydrodynamic and quality model was used to simulate flow field, the water quality and contamination dispersion. The parameters of the model were calibrated with measured data of the water depth, flow and water quality in Yuncheng reach of the Fen River. According to the simulated result, the total area of pollution belt with 19 sewage outlets is 8.89km2 in normal year. And 3.89% of the reach has a worse water quality than V class in standard. The percentage of V and Ⅳ Class of water is 69.17% and 26.94%.In dry year, the total area of pollution belt with 19 sewage outlets is 8.89km2.The percentage of inferior V, V and Ⅳ Class of water is 27.80%, 69.46% and 2.74%. It was shown by the simulated results that the concentration gradient decreases with increasing distance to the outlets and the dilution and dispersion of pollutants was enhanced by a greater river flow.
Rotor Speed and Stator Resistance Identification of Direct Torque Control for Induction Motor Based on Mutual MRAS
Authors: She Zhi Ting , Yuan Jun Bo , Zheng Yong , Peng Yong Jin
Published: November 2011

Based on the dynamic mathematical model of induction motor, the mutual model reference adaptive system method (MRAS) for rotor speed identification is proposed to implement a speed sensorless direct torque control of induction motor. The model reference adaptive theory is flexibly used in the rotor speed and the stator resistance online identification. The reference model and adjustable model used in the mutual MRAS scheme are interchangeable. Therefore, The induction motor speed sensorless direct torque control system can obtain high-precision speed identification. Computer simulations and experimental results show that the method can solve the problems of speed control accuracy and system stability under the influence of motor parameter variation. The low speed performance of DTC is also improved.
The Simulation of Pitch Control System for Variable Speed Wind Turbine Based on Neural Network
Authors: Liu Li Na , Qi Hui Juan , Li Bin
Published: November 2011

The parameters of large wind turbine need to be adjusted timely to avoid excessive wind energy that will cause damage on the wind turbine itself. Based on the simplified mathematical model of wind turbine, we got the relationship curve between its parameters. When the speed of wind was higher than the rated wind speed, we figure out the value of pitch angle during the changes of effective wind speed to keep rated output power. Neural Network used to train the data and pitch control system was built, it used to adjust pitch angle once the wind changes, and maintain the output power at rated value. The complex mathematical relation can be replaced by the trained network model. Detailed simulation results have confirmed the feasibility and performance of the optimal control strategy, which protect the wind turbine from damage and prolong its service life.
System Stability Improvement of DG Connected to the Grid Based on Power Conversion and Energy Storage System
Authors: Kuang Hong Hai , Wu Zheng Qiu , He Xiao Ning
Published: November 2011

With people attaching importance to sustainable development and reducing environmental pollution, distributed generation technology is attracting more and more and more attention due to its unique environmental protection and economy. However, distributed generation will change with natural conditions so that it can not output power constantly and steadily, and most DGs are connected to the power system at distribution network side, this will cause system stability problem. In order to fully play the role of distributed power and avoid the adverse effects of its existence, a power conversion sand energy storage system to effectively regulate the system stability of distributed generation connected to the grid is presented. MATLAB/Simulink is used as a simulation and study tool in this paper, a system model of distributed generation connected to the grid is built and combined with actual operation in different environments to conduct real-time simulation analysis, the simulation results show that the power conversion system can enhance system stability of distributed generation connected to the grid.
Comparison of Expert and Novice Eye Movement Behaviors during Landing Flight
Authors: Liu Wei , Liu Cheng Kun , Zhuang Da Min , Liu Zhong Qi , Yuan Xiu Gan
Published: November 2011

Objective To study expert and novice eye movement pattern during simulated landing flight for providing references to evaluate flight performance and training of pilots. Methods The subjects were divided in to two group s of expert and novice according to their flight simulation experience. Eye movement data were recorded when they were performing landing task. Comparison of expert and novice flight performance data and eye movement data was made. Results It was found that the differences between expert and novice lay not only in flight performance but also in eye movement pattern. Performance of expert was better than novice. Expert had shorter fixation time, more fixation points, faster scan velocity, greater scan frequency and wider scan area than novice. It was also found that eye movement pattern of expert bring lower mental workload than novice. Conclusion Flight performance is related to eye movement pattern. Effective eye movement pattern is related to good flight performance. The analysis of eye movement indices can evaluate pilots’ flight performance and provide reference for flight training.
Study and Simulation for MPPT Control of Photovoltaic Generation System Based on Combining Constant Voltage Method with Adaptive Duty Cycle Perturb Method
Authors: Yun Wang Dong , Ying Xu Qi , Sheng Zhu Yong , Ming Xiao Jun , Xue Hu Jiang
Published: November 2011

A MPPT (Maximum Power Point Tracking) control method of PV (Photovoltaic) generation system is proposed based on the shortcoming of the existing MPPT algorithms. The method applies CVT (Constant Voltage Tracking) algorithm to adjust the working point of PV array near the MPP (Maximum Power Point) for fast tracking when working point is far from MPP, and uses adapting duty cycle perturb method to optimize the steady state characteristic of MPP for effectively eliminate the output power oscillation under the setting precision. Its model is established and simulated with Matlab/Simulink.The CVT, duty cycle method and proposed methods are simulated respectively and simulation results show that, the proposed method tracks the MPP exactly and quickly and improves the energy conversion efficiency of PV generation system by eliminate the output power oscillation around MPP. Its fast response speed improves the static and dynamic performance of photovoltaic power system.
Research on the Influence of Zero Space Voltage Vectors on Direct Torque Control of PMSM
Authors: Gao Yu Ying , Liu Ming Ji , Kong De Ping , Li Yun Gao
Published: November 2011

Direct torque control (DTC) has been widely used due to its advantages of less parameter dependence and faster torque response. However, in conventional DTC, there are obvious torque and flux ripples. This paper studies the influence of zero space voltage vectors on DTC system of permanent magnet synchronous motor (PMSM). The control model is established with Matlab/Simulink software. The simulation results show that the ripple torque can be reduced significantly when zero space voltage vectors are used. Meanwhile, the use of zero space voltage vectors can evidently decrease the switching frequency of the power switches as well as the switching loss. The achievements in this paper can provide a reference to improve DTC performance of PMSM.
The Simulation Research of Rotor Flux Model in Asynchronous Motor Control
Authors: Xu Bo Qiang , Yang Fu Hua
Published: November 2011

The speed-adjustable system of asynchronous motor has been widely used in industrial production. in motor control, magnetic control is a key problem, but in order to realize the control of motor, magnetic field must be tested. The testing methods about rotor flux according to the rotor field-oriented control of motor are discussed in this paper. The paper describes the present two rotor flux calculation models: Voltage model and Current model. It concretely analyzes mathematical expressions of these two models in different coordinates, and realizes the matlab simulation of two kinds of model, the simulation results are compared by observations of the magnetic chain calculation results.
Analysis on the Loading Stress, Thermal Stress and Coupling Stress in PCC-AC Composite Pavement
Authors: Yang Bin , Yang Tai Qin , Peng Gao Dian
Published: November 2011

PCC-AC composite pavement has the advantages of high carrying capability and excellent comfort. The maximum temperature gradient formula of PCC-AC composite pavement in Guangxi region is fitted. The loading stress, thermal stress and coupling stress in AC layer of with dowel bar can significantly reduced. All kinds of stresses are also decreased with the narrow dowel bar space. Therefore, the Shrinking joints of composite pavement with dowel bars can greatly reduce the probability of reflection crack initiation. As the thickness of AC layer, there is greater influence on thermal stress and coupling stress than on loading stress, The loading stress, thermal stress and coupling stress in PCC layer decreases with the thickness increasing of AC layer, their relationship is linear. The loading stress and coupling stress of PCC layer reduce significantly with increasing the PCC thickness. AC layer also plays a role in reducing the loading stress and coupling stress of PCC layer.
A Study of Structure Parameters of Block Copolymers Polystyrene-Polyethylene Oxides
Authors: Jiang You Qing , Zhang Yun Bo , Lin Zhi Yong , Chen Jun , Yu Ming Ming
Published: November 2011

Block copolymer consists of two and more than two of different polymer links. Epoxy terminated polydtyrene (Ps-ep) active polymer was used to polymerize polystyrene (Pst)-polyethylene oxide (Peo) block copolymer P (st-b-eo). There were the mixtures of (Ps-ep), (Pst), (Peo) and P (st-b-eo) in the polymerization. It is necessary to separate (Ps-ep), (Pst), (Peo) and P (st-b-eo) in the mixtures in order to determine structure parameters of P (st-b-eo) block copolymers. We can know for certain their types of ABA, BAB and AB of polystyrene (A)-Polyethylene oxides (B) block copolymers with analysis of gel permeation chromatography (GPC).
Direct Extrusion of Circular Profiles with Surface Composite Produced by Friction Stir Processing
Authors: Aghagol Arash , Darani Saeed Mahmoodi , Abrinia Karen , Givi Mohammad Kazem Besharati
Published: November 2011

In this research, a new application of friction stir processing (FSP) in producing surface composite on circular billets was introduced. Al/Cu composite was fabricated by FSP on the surface of a 1050 aluminium cylinder with the diameter of 60 mm. Then this cylinder with surface composite was extruded with the extrusion ratio of 1.7. Finally, microstructure and microhardness were investigated before and after the extrusion. H13 hot work steel was used as the material of the tool whose pin diameter and length were 6 mm and shoulder diameter was 18 mm. The rotation and traverse speed of the tool were 1000 rpm and 25 mm/min respectively. The microstructural investigations show that the thickness of the composite layer decreases and a uniform layer of the composite remains on the surface after the extrusion. Also the microhardness measurements demonstrated that the hardness of the composite layer was higher than the base metal and the microhardness of all zones increased after the extrusion.
Inorganic Composite Material Based on Fly Ash, Red Residue from Bauxite Ore for Road Building Projects in Vietnam
Authors: van Chanh Nguyen , Shigeishi Mitsuhiro , Tho Tran Quoc
Published: November 2011

The paper present solidifying technology based on geopolymer theory of inorganic composite materials from bauxite, red residue from bauxite ore, fly ash and activators for road building projects in Vietnam. This study describes physical properties and chemical compositions of bauxite, red residue, fly ash and the effects of bauxite-red residue-fly ash-activator mixes on the geotechnical properties of inorganic composite materials. Mixture design and testing procedures for inorganic composite materials. New inorganic composite materials have high durability and ability to water resistance. The presentation also show microstructure analysis of inorganic composite materials based on bauxite residue, fly ash and activators by X-ray diffraction, Infrared spectroscopy (IR), transmission electron microscopy (TEM) display high density, and modified microstructure of inorganic composite materials. Construction method of road using inorganic composite materials is also presented.
Effect of Blank Holder Force with Low Frequency Vibration Technique in Circular-Cup Deep-Drawing Using AZ31 Magnesium Alloy Sheet
Authors: Horiike Naoki , Yoshihara Shoichiro , Tsuji Yoshitaka , Okude Yusuke
Published: November 2011

In the deep-drawing process, the application of low-frequency vibration to the blank material has recently been focused on with the aim of improving the friction performance between the die and the blank material. A servo-controlled press machine is suitable for applying low-frequency vibration to the blank during the deep-drawing process, because the punch speed and blank holder force (BHF) are easily controlled as process parameters by using the servo motors. In this study, a BHF with low-frequency vibration was proposed as a technique for improving deep-drawability, which is mainly affected by the friction performance and the lubricant condition. We found that the friction performance between the blank surface and the blank holder was decreased in the case of a BHF with low-frequency vibration since the lubricating oil rapidly flowed into the clearance during the forming process. Furthermore, for a BHF with low-frequency vibration, the punch force and the deformation resistance were lower than those in a deep-drawing test without low-frequency vibration.
Review of STEP-NC Compliant System for Turn-Mill Operations
Authors: Yusof Yusri , Nor Mohd Fahrurazi Mohd
Published: November 2011

Today with the latest technology the information beyond tool movement and switching instruction such as tooling, manufacturing features and process sequences are needed to support global adaptability for manufacturing with a specific focus on CNC-based manufacture This research focuses on the use of the new standard; ISO 14649 (STEP-NC), to address the process planning and machining of discrete turn/mill components and proposes a STEP Compliant NC structure for generation of ISO 14646 code which can be used for turned component manufacture. The novel application of this work is STEP-NC compliant process control where the research will utilise and extend the standard for in process measurement at the machine and also explore the application and integration of the STEP-NC standards. The major contribution of this research is the review of a computational environment for a STEPNC compliant system for turn/mill operations.
Research on Meshing Theory of Involute Helical Gear with Asymmetric
Authors: Li Ning , Li Wei
Published: November 2011

This paper analyzes the relationship between cutter parameters and gear profile parameters on the basis of rack cutter with asymmetric, and proves the new type gear can be manufactured by traditional methods. The meshing theory of involute helical gear with asymmetric is researched. Equation about involute profile helicoids is derived. The 3D model of involute helical gear with asymmetric is built, and the model establishes the basis of FEA of tooth root bending strength and tooth surface contact strength.
Optimum Design of Movement Parameters for Soft Plastic Vibration Sorting Machine’s Screen
Authors: Yang Xian Hai , Zhao Hai Xing
Published: November 2011

According to the circumstance of soft plastic oscillating separator’s movement, a mechanical model of the mutual movement for material and screen is established, and reached the relative motion equation. Through building the mathematical model to optimize the parameter of the materials of different density that on the same vibrating screen, we can get the optimal parameter for the successful separation.
Preload Analysis of Bolt for a Small Pneumatic Cylinder
Authors: Liu Wei , Wang Cong Ling , Jiang Dan
Published: November 2011

Builds finite element model of a small pneumatic cylinder based on ANSYS, deals with the prets179, analyses the stress distribution character of a small pneumatic cylinder .Lastly, the calculation is compared with the test. It is shown that the finite element model of a small pneumatic cylinder with bolt pretension is agreed with the actual situation of cylinder.
Component of Clathrate Hydrates Formed in CH4-TBAB-H2O System
Authors: Yang Liang , Fan Shuan Shi , Lang Xue Mei , Wang Yan Hong , Bi Dan Dan
Published: November 2011

Methane storage data of clathrate hydrates formed in ternary system, methane-tetra-n-butyl ammonium bromide-water (CH4-TBAB-H2O), was measured by a magnetic suspension weight adsorption instrument at the temperature of 273.64 ~ 278.23 K and the pressure of 2.01 ~ 7.07 MPa, for two concentration (20.8 wt % and 43.3 wt %) of TBAB solutions. The hydrates component was qualitatively analyzed. The results showed that the structure of CH4-TBAB semi-clathrate hydrates was deformed at high pressure possibly due to methane molecules replacing TBAB molecules and forming structure I true methane hydrates for the 20.8 wt % TBAB solutions at 273.64 K. For 43.3 wt % TBAB solutions, at the same experimental temperature and pressure, the maximum mass fraction of methane in CH4-TBAB-H2O clathrate hydrates was only 1.64 wt % which was less than the ideal maximum value (3.08 wt %). It showed that for the 20.8 wt % TBAB solutions, TBAB molecules were not replaced by methane molecules but both CH4-TBAB semi-clathrate hydrates and structure I true methane hydrates were formed simultaneously. For 43.3 wt % TBAB solutions, the reason of low methane storage capacity may be that the pressure was not high enough.
Study on Natural Gas Converted to C2 Hydrocarbons in Plasma State
Authors: Wang Da Wang , Ma Teng Cai , Zhang Yu Tao
Published: November 2011

This paper presents the methane coupling with a new developed rotary multidentate helix electrode under plasmas at atmospheric pressure and in the presence of hydrogen to investigate the effects of peak voltage input the electric fields and feed flow rate on CH4 conversion and C2 yield and selectivity. The best result without remarkable amount of coke is 69.85% of single pass yield of C2 hydrocarbons with 70.46% of CH4 conversion and 99.14% of selectivity of C2 hydrocarbons. The emission of excited species such as excited radicals and atoms (C,CH,C2,H and H2) were detected in the spectra range of 300 nm～700 nm.
General Model of Optimal Control of Fully Flexible Vibrating Suspension Systems
Authors: Niu Jun Chuan , Zhu Ji Qing , Ji Fa Wen
Published: November 2011

Accounting of the fact that there are so many SMR systems in the isolation practices and investigation that it is not convenient and efficient to deal with them, the paper presents a general model and its mathematical description of fully flexible vibrating suspension systems, in which both machines and bases are considered as finite or infinite flexible beams, by sub-structural mobility technique and transfer matrix approach. Then in accordance with the combination of subsystems and the two proposed optimal control strategies, the formulation of power flow is derived. Some simulations are performed to show the validity and the reliability of the presented model and to obtain some valuable results which can be regarded as a set of general benchmarks of suspension system designs.
Study on the Effects of Coal Blending on the Slurry Ability of Shenmu Coals
Authors: Liu Jian Zhong , Yu Yu Jie , Zhou Jun Hu , Du Chong , Ye Lin , Cheng Jun , Cen Ke Fa
Published: November 2011

Shenmu coals as low rank coal are difficult to prepare for Coal Water Slurry (CWS). The maximum slurry concentration of Shenmu CWS is lower than 60%, which is not available for practical application. Coal blending is a simple operation and low cost method to improve the slurry ability of low rank coal. Two different kinds of anthracite and bituminous coal samples were blended in Shenmu coal to study the effect on the preparation of CWS, respectively. The results showed that the maximum solid concentration of CWS increased as the proportion of high rank coal rise. And the viscosity of CWS is dropped at the same concentration. Different coals blending have different effects on the elevation of slurry ability for Shenmu coal. The raw coal with best slurry ability is not always the most suitable for blending in low rank coal. HuanNan bituminous coal is the best choice for blending in Shenmu coal. The maximum solid concentration of CWS can be increased by 6% when the proportion of HuanNan coal reached to 70%.
A New Model of Intrusion Detection Based on Data Warehouse and Data Mining
Authors: Qi Bei , Dong Yun Feng
Published: November 2011

Now, security of network is threaten from double layers inside and outside network, the inherent defect of firewall technology makes the intrusion detection and network traffic analysis as the main means of defense, aiding firewall. Now network intrusion detection have problem of higher false alarm rate, we apply the data warehouse and the data mining in intrusion detection and the technology of network traffic monitoring and analysis, propose a new model of intrusion detection based on the data warehouse and the data mining. The experimental result indicates this model can find effectively many kinds behavior of network intrusion and have higher intelligence and environment accommodation.
Materials Flow Analysis on the System of Flue Gas Desulfurization and Denitration with Pyrolusite Slurry
Authors: Qiu Cheng , Sun Wei Yi , Wang Chao Long , Su Shi Jun
Published: November 2011

Circular economy promotes the establishment of recycling-oriented society and recycling-based businesses. Circular economy is characterized by eco-efficiency improvement and materials recycle, furthermore, it also has provided a practical and feasible way for the sustainable development of human society. Materials flow analysis (MFA) has provided a new and simple way to study the development of circular economy. MFA is based on materials inputs and outputs, and then creates materials inputs and outputs account to manage materials flow. The process using pyrolusite for FGD produces manganese, high-purified manganese carbonates and slag used for cement production as byproducts. Electrolytic manganese production process, high-sulfur coal combustion process and cement production process are studied in the research. Materials flows of these processes are studied. The new production patterns are compared with the traditional ones basing on MFA. The results show that these processes are more environment-friendly and resource-saving in the comparison. To evaluate the circular economy efficiency of the complementary system, the evaluation index system of the circular economy construction is created.
The High-Power of DC Power with Auto Tracking Power Frequency
Authors: Yu Gui Yin
Published: November 2011

This paper analyzes the reason that the common thyristor trigger is unable to fulfill power supply in wide range changes of frequency. The high precise frequency/voltage converter is used to monitor and track frequency changes of the simultaneous power supply. The simultaneous signal and charge current source are provided by the converter for saw tooth wave trigger. The frequency of saw tooth wave changes as the same time the frequency of power supply changes in wide range. However, the amplitude of the saw tooth wave can be kept constant. This can achieve the controlled angle of the thyristor trigger does not change with the large-scale voltage frequency changes of the simultaneous power supply when the same Phase-shifted control voltage was used.
Parametric Instability of Laminated Composite Doubly Curved Shell Panels Subjected to Hygrothermal Environment
Authors: Sahu S. K. , Rath M. K. , Sahoo R.
Published: November 2011

The dynamic stability behavior of laminated composite shells subjected to hygrothermal loadings are studied in the present investigation. A simple laminated model is developed for the vibration and stability analysis of laminated composite shells subjected to hygrothermal conditions. A computer program based on FEM in MATLAB environment is developed to perform all necessary computations. An eight-node isoparametric element is employed in the present The analysis with five degrees of freedom per node. Element elastic stiffness matrices, mass matrices, geometric stiffness matrix due to mechanical and hygrothermal loads and load vectors are derived using the principle of minimum potential energy. Quantitative results are presented to show the effects of curvature, ply-orientation, degrees of orthotropy and static load factors of laminate on dynamic stability of composite shells for different temperatures and moisture concentrations.
Microstructural Characterization of Wire Electro Discharge Machined Tungsten Carbide Cobalt Metal Matrix Composite
Authors: Muthuraman V. , Ramakrishnan R.
Published: November 2011

Tungsten carbide - Cobalt (WC-Co) reinforced metal matrix composites are most commonly used as tool and die materials. The machining of WC- Co metal matrix composites is usually done by wire electric discharge machining. However during WEDM of WC-Co samples possibility of defects and electrolyzation is high. Also coating of Cu-Zn tool electrode on machined surface and void space takes place, thereby affecting material integrity. Analyzing the microstructures can remarkably reveal the identification, location, extent and criticality of the defects. In this study WC-Co metal matrix composite was wire electric discharge machined with two critical parameters, pulse on time and delay time. The machined samples were analyzed using micrographs, scanning electron microscope, EDAX and the results tabulated. It was found, that lower pulse-on time and medium pulse-off time leads to less rapid quenching and subsequent improvement in surface finish, less craters, voids. This prevents potential sites for defect and weakening of material by filling with cu-zinc particles for unbounded tungsten particle.
Research of Correctness on Internal Stress Measurement in Aluminum Alloy Thick Plate
Authors: Liao Kai , Wu Yun Xin
Published: November 2011

It’s necessary to research and analyze the correctness of internal stress measurement, in order to effectively deal with the measurement problem of stress field and rightly describe the distribution character of stress in aluminum alloy thick plate. Firstly, the total uncertainty of stress calculation in layer removal method (LRM) is determined by experimental error and model error, and less than ±10MPa, in which the accuracy of experiment is high. Secondly, in the integral calculation of LRM, a modified function is proposed by the multi-methods of simulation and experiment, and can compensate the deviation resulted from unpredictable error for experimental conditions. Then the multi-methods achieve the value of X-ray surface stress, simulation calculation and experimental results to consistent, the correctness of experimental calculation is enhanced. The research presents that the LRM can exactly describe distribution of internal stress in thick plate under special experiment conditions.