bluuebunny/crossref_metadata_2025 huggingface dataset:
Experiment Study of the Single Point and Multi-Point Natural Gas Electronic Injection Systems
Authors: Zhao Qiang , Ni Cheng Qun , Zhang You Tong
Published: March 2013

To compare and improvediesel engine emission performance by different injection methods, a multi-pointnatural gas in-system and a one-point injection system were developed. In bothsystems, the electromagnetic valves are used to control injection and totalquantity. The system was designed for the type X6130 diesel engine. The testresults showed that the multi-point system has great advantages in the aspectsof emissions. To adopt multi-point gas injection is a better way to reduce theemission.
Development and Application of Backplane-Type EtherCAT Slave Controller
Authors: Kang Cun Feng , Zang Chun
Published: March 2013

The EtherCAT real-time Ethernettechnology that proposed by Beckhoff Company, is now widely used in industrialautomation and in motion control fields. Inthis paper, a slave moduledesign adopted the backplane type iscarried out, based on in-depth study of the ET1200 chip and the Ebusprotocol, including a communication board EKM which regards PIC microcontrolleras microprocessor, a board EKS-IO which is used for digital IO expansion,and a stepping motor control boardEKS-S. Then the overall debuggingand application on a warehousedevice show that the EtherCAT slave controller meets the performance requirements of EtherCAT buscommunication, with better reliability and a certain practical value.
Research on Fuzzy Direct Torque Control System Based on Improved Grey Model Prediction
Authors: Zhao Wei , Wang Qiang , Wang Lu Yan
Published: March 2013

In order to increase the accuracy and real-time of grey prediction fuzzy direct torque control system, an improved grey prediction fuzzy direct torque control method was advanced. The equal-dimensional new information model was used to construct the new grey prediction model. The position angle of motor stator flux was divided into sectors, by which the simplified fuzzy algorithm was obtained. The simulation results show that the improved method can greatly overcome the shortcomings caused by the original method, such as the overlarge dimensions of original time sequence and the decrease of effective information amount due to the lasting of time. The calculation quantity in prediction process is reduced. The precision of prediction and the real-time of fuzzy control system are increased. The instability of stator flux is lowered and the speed respond of motor is meliorated.
The Key Technical Research on V2G System
Authors: Wang Zhen Po , Wang Shuo
Published: March 2013

Basing on the analysis, the functions of the V2G system, such as peak shaving, frequency adjusting, UPS and disturbance stabilizing, are discussed in this paper. And the key technologies of V2G are put forward according to the ongoing research and demonstration. The main research route and methods are established, which includes the nonlinear multivariable decoupling method of power battery pack, the integrated process control method of EV energy and driving system, the statistical characteristics of EV large-scale demonstration and the control theory and method.
Bridgeless SEPIC PFC Converter
Authors: Do Hyun Lark
Published: March 2013

A new bridgeless powerfactor correction (PFC) converter is proposed in this paper. The proposed converter isbased on single-ended primary inductor converter (SEPIC). In the proposed converter, conductionlosses are reduced and efficiency is improved by eliminating bridge diodes. In addition, input currentripple is significantly reduced by utilizing coupled inductors. Like a conventional SEPIC PFCconverter, the proposed converter provides almost unity power factor (PF). Steady-state analysis ofthe proposed converter is performed. Experimental results based on a prototype are alsoprovided to verify the effectiveness and feasibility of the proposed converter.
Remote Monitoring System for Direct Current Power
Authors: Liu Ren Li , Zhan Yi , Yan Bin , Wang Hui Juan
Published: March 2013

With the purpose of remote centralized monitoring for DC Power, the paper has the scheme of the system of on-line real-time monitoring based on Web, and emphatically introduces the design and development of the monitoring server. The system realizes collecting, storage and real-time display of multiple DC Power, which makes the crews monitor the real-time working condition of DC wherever they could access the Internet. The system has good extensibility and a promising prospect in practical.
Fractional Order Controller Design for Ball and Beam System
Authors: Korkmaz Mehmet , Aydogdu Omer
Published: March 2013

Fractional order controllers which has mostly used recently have investigated in this paper. It is benefit from ball & beam system to show effects of controllers. Fractional order controller and its integer form are compared with simulation results for the mentioned system. Parameters of controllers have obtained by using evolutionary algorithms techniques which are particle swarm optimization (PSO) and genetic algorithms (GAs). According to results, it is confirmed the advantage of fractional controllers. Beside, PSO has a little bit superiority over GAs technique for determining optimum values of controller parameters.
An Optimized Design for Inverted Pendulum System of Active Disturbance Rejection Control Based on Generic Algorithm
Authors: Du Jun , Jiang Jiu Long
Published: March 2013

The dissertation comes up with an optimized design for ADRC inverted pendulum system controller based on Generic Algorithm. This design making full use of ADRC method ,which can coordinate the ability to the response time and overshoot meanwhile it can also be provided with the characteristic of high anti-jamming ability, well Robustness ability ,designing ADRC inverted pendulum system controller for improving the performance of inverted pendulum system .At the same time ,aiming at more parameter of ADRC implement-designed ,more difficult to carry on designing problem ,it conducts more excellent design of excellent parameter with applying generic optimization algorithm ,and obtains the most excellent parameter of performance .At last simulate the control model with the help of MATLAB. Emulation result indicates ,the ADRC inverted pendulum system control method that the dissertation showing has provided with well evanescence and stabilization ,less responding time without overshoot ,with more control effect.
Design of Auto-Stabilization Control Technique for a Quadrotor System
Authors: Abas Norafizah , Akmeliawati Rini , Ibrahim Zulkiflie , Rashid M. Zamzuri A. , Samsudin N. Hazahsha
Published: March 2013

This paper presents the design of auto-stabilization control technique for a quadrotor system. Aquadrotor is a highly nonlinear and has to be stabilized by a suitable control technique. Therefore, the main focus of this research is to design an appropriate control algorithm that able to auto-stabilize the quadrotor at hover. The dynamic modeling of the quadrotor is described by sets of equations of motion that are derived based on the Newton-Euler formalism with the implementation of UKF for parameter identification and state estimation. The control strategy adopted includes feedback linearization coupled with Proportional-Derivative (PD) controller for the translational subsystem and backstepping based Proportional-Integral-Derivative (PID) controller for the rotational subsystem. It is developed in MATLAB/Simulink platform and is validated via real-time implementation. Both controllers give satisfactory simulation results, where acceptable peak of overshoot and small steady state errors are achieved. Experimentally, the throttle is controlled in manual mode while attitude angles are stabilized automatically. The simulation and experimental results show that the proposed controller is able to effectively stabillized the quadrotor.
Application in Meta-Evaluation of Weapon Quality Based on Evidence Theory of Weight
Authors: Cao Fei , Wu Fan , Lu Fang
Published: March 2013

A method based on the combination of experts’ assessments and D-S evidence theory of weight is proposed for reliability about result of quality evaluation. This method recurs to the idea of meta-evaluation, and actualizes the reliability measurement, then provides technical support for robust evaluation. Finally, we validate the method by using weapon primary evaluation result. It indicated that the method can measure the validity and reliability for primary evaluation result, and then improved commendably decision-making capability of weapon quality evaluation.
Interaction of Laser Energy with Bow Shock in Mach 5 Flow
Authors: Wang Dian Kai , Hong Yan Ji , Li Jiang Bo
Published: March 2013

In order to develop a potential way to reduce the stagnation pressure and heat flux of the blunt body in hypersonic flow, single pulsed and high rated laser energy are deposited respectively to control the bow shock in Mach 5 flow. Process of the interaction of 100mJ single pulsed laser energy with bow shock is studied by schlieren experiment in Mach 5 shock tunnel. The results indicate that the schlieren photographs and stagnation pressure at different times fit well with the simulation. Bow shock is distorted by the laser induced blast wave. During a single laser pulse, the average stagnation pressure and temperature are reduced by 6.5% and 3.4%. High rated laser energy is used to sustain the low pressure and heat flux region to increase the control efficiency. With the power of 6.6% of the enthalpy flux, when the distance of deposition point and blunt body is 1.1 times of the diameter of the blunt body, the pressure and heat flux of the stagnation point is reduced to 49% and 75%, respectively. The mechanism of interaction of laser and bow shock is disclosed.
A Direct Measurement System to Estimate Gas Content in Coal
Authors: Xue Sheng , Xie Jun , Wang Yu Cang
Published: March 2013

Gas content in a coal seam is used in mine safety such as gas emission estimation and the assessment of the risk of outbursts of coal and gas in underground coal mines. A direct measurement system has been developed to estimate the gas content. The main components of the system include an innovative sampling-while-drilling unit for coal sampling, a portable gas desorbing meter for initial gas flow, a desktop fixed surface-based unit for measuring gas flow while the sample is crushed, and computation program for gas content estimation. The system has been successfully applied in some underground coal mines in Huainan. This paper describes the system and its main components.
Mechanical Analysis of Outer Sleave for Electronic Pressure Meter
Authors: Yan W.H. , Yan J. , Chen Y.
Published: March 2013

Electronic pressure meter is an essential part in the fracturing process. This paper briefly introduced the structure of electronic pressure meter. Mechanical properties of outer sleave for electronic pressure meter in the high-temperature, high-pressure conditions is analyzed emphatically. And gives the change regularity.
Monitor and Cut Technology of Anomaly Flow for Gas Meter
Authors: Kong Xiang Yu , Liu Jin Lan , Liu Wei Qin , Yao Shu Jun
Published: March 2013

In this paper, the cut technology of anomaly flow for gas meter by mainly real-time monitoring the flow is studied and the definition method for anomaly flow of indoor gas leakage is introduced. Full range safety intelligent cutting function is increased on the indoor gas meter, which can raise the safety of indoor gas facilities and residents gas consumption. It is proved that the technology is an effective way to prevent the happening of gas accidents and reduce the frequency severity of the gas accidents.
Experimental Study on the Frictional Resistance of Gas Flow in Vertical Helically Coiled Pipe
Authors: Zheng Shui Hua , Mu Jie Gang , Fan Wen Can
Published: March 2013

Experiments were carried out to learn about the frictional resistance of gas flow in vertical helically coiled pipe. The expression of friction factor was established and the formula used to calculate the frictional resistance of gas flow in vertical helically coiled pipe was defined based on partial data got from different experiment conditions. The calculating formula was verified by the experimental data. The results show that the formula is accurate enough to calculate the frictional resistance of gas flow in similar operating conditions.
Study on Processing Optimization in Ultrasonic-Assisted Grinding of SiCp/Al Thin-Walled Workpiece
Authors: Wang Ming , Zhou Ming
Published: March 2013

Thin-walled workpieces have the characteristics to withstand a greater load with less material and they are used in aerospace field widely. SiCp/Al composite has high strength and stiffness, which meets the requirements of the aerospace workpieces well. The optimization method is studied with grinding stability and material removal rate as constraint conditions in this paper. The processing parameters optimization of a SiCp/Al thin-walled cylinder is analyzed according to stability lobe diagram. The grinding parameters optimization could be achieved by this method and the chatter could be prevented effectively.
Dynamic Elasto-Plastic Analysis of 300m Span and 0.15 Rise-Span Ratio Arch Truss by Ninghe Wave
Authors: Shi Yi , Li Hai Wang , Chen Ying Yi , Zhong He Ping
Published: March 2013

In this paper, elasto-plastic dynamic response analyses of 300m span arch trusss structure model are carried out under the condition of earthquake by using SAP2000. The geometric and material nonlinear effects are considered. Based on the plastic-hinge theory, by gradually increasing the peak acceleration of earthquake, the structures dynamic elasto-plastic analysis have been done with Ninghe wave under the initial condition that the arch trusss stress and strain are caused by constant load and snow. According to simulation results, the critical peak acceleration is obtained when the steel framework lose stability, which can judge the anti-seismic capacity of the structure.
The Application of Particle Motion Equation in Coal Handling System of Dissipation Dust Law
Authors: Ge Shao Cheng , Feng Yao Xuan , Jing De Ji
Published: March 2013

For getting the effectiveof application in dissipation dust law with particle motion equation atcoal handling system of belt machine tail, must be to proceed related numerical simulation in the way of dust particles motion incoal handling system of belt machine tail and dust concentration of diffusion inoperation space. Application particlemotion equation theory for numerical simulation to coal dustparticles, obtained dust coal dissipation law in coal handling system, at thesame time combine with the data of the field test of dust concentration andfallout dispersion for analyzing and comparing. The results of comparison showthat: the data of numerical simulation with particle motion equationin coal dust dissipation law is coincide with reality dissipation law. Accordingto the conclusion of this research, it is provides theoretical basis forprevention and treatment in coal mine of coal handling system of dustdissipation.
Study and Application on Ultrasonical Combined Electrical Micro-Machining the Special Shape Micro-Structures
Authors: Zhu Yong Wei , Du Yu Ren , Miao Xing Lei , Yun Nai Zhang
Published: March 2013

For manufacturing the special shape micro-structures with hard and brittle materials , the ultrosonical combined electrical micro-machining method is proposed and improved. The ultrasonical combined synchronous electrochemical micro-machining system is built and optimized, which machining parameters can be adjusted in a big ranges, and the synchronous target between the ultrasonical vibration and the voltage of micro-PECM(Micro-pulse electrochemical machining) can be realized. The micro-machining electrodes are manufactured in round sections by combined micro electrical-discharged machining (EDM).The mechanism tests of ultrasonic vibration combined electrical pulse micro-machining tests are carried. It is adopted that the low amplitude of electrical voltage (no more than 6V) and the static electrolyte with lower electrical conduction rate, the good machining accuracy and surface quality are acquired. The regular morphology array micro-round holes are manufactured successfully on friction units' working surface, which can save oil , improve the friction performances and prolonging working life of important friction units. In additional, the fixed holes satisfying the precision needs are machined on the hard and brittle piezo-ceramics pieces, which are often used in many important micro-precise piezo-ceramics sensor. It is proved that ultrasonic combined electrical micro-machining is an effect method for to machine the special shape micro-structures.
Evaluation on Effectiveness of Weapon Equipment Based on Grade Conversion Operations
Authors: Mu Lian Yun , Wei Yong
Published: March 2013

Mathematical models and statistical models of effectiveness were set up during the technology preparation period. A model and flow was set up based on the system parameters and using regulation applying the theory of Monte-Carlo sampling, discrete event simulation and mathematical statistical. Results of its application show that the model can not only simulate effectiveness of equipment weapon, but also can analysis sensitivity, can offer auxiliary decision-making during the technology preparation period.
Pipeline Vibration Analysis and Control for the First Booster of Ethylene
Authors: Zhang Wei Yi , An Yong Ming , Wang Shu Feng , Wu Hang , Lei Jun Yong
Published: March 2013

For existing local severe vibration problems on the pipeline system of conveying ethylene booster in ethylene cracking system of a petrochemical company, the detailed analysis by CAESARII was carried out to its pipeline system natural frequency and vibration modal; The flow of ethylene gas within the booster pipeline from the suction pipe to exhaust pipe inside including the buffer tank was analyzed using fluid analysis software--FLUENT, the pressure field and velocity field of the flow was obtained. According to the law of the suction and exhaust valve open-closed mouth, dynamic boundary conditions was set on the suction valve and exhaust valve. The ethylene flow non-steady-state analysis calculations was carried out within the pipeline from the suction tube inlet to suction valve and from the exhaust valve to the exhaust tube outlet , the law of the pressure pulsation frequency response was obtained on the suction pipe inlet and the exhaust pipe outlet. The results show that ethylene gas pipeline pressure pulsation frequency response was basically equal to the frequency of the suction and exhaust valve open-closed mouth; The actual pipe vibration modals of the pipeline system on the scene and the pipeline vibration modals a few corresponding to the natural frequencies of the pipeline system close to the pulsation frequency in flow pressure are very similar, indicating that the vibration of the pipeline system is due to the pressure pulse frequency of the ethylene gas internal pipeline close to the natural frequency of the local pipeline, caused due to local resonance. Changing the form of hangers in vibration system can change the natural frequency of pipeline to avoid resonance. Tube fluid dynamic pressure caused by the stress of the pipeline is limited and will not cause damage to the tube material. Mass flow rate does not match with the tube diameter will cause too large flow velocity, the inertia force caused by the larger on the suction valve and exhaust valve before and after, resulting in the forced vibration of the compressor body.
Grid-Connected Inverter with Harmonic Compensation for Distributed Power System
Authors: Wang Li , Huang Wen Xin , Bu Fei Fei , Hu Ying
Published: March 2013

To solve the problem of harmonic pollution in distributed power system, a new type of grid-connected inverter with harmonic compensation is studied in this paper. This system adopts a unified control strategy with decoupled active and reactive power based on grid voltage orientation. Both the grid connection and harmonic compensation are realized together in one inverter, which improves the inverter’s utilization efficiency and protects the power grid from harmonic pollution. The simulation and experimental results are shown to prove the correctness of the control strategy.
Parametrical Finite Element Modeling of Overhead Transmission Line-Towers System
Authors: Xu Ke Ju , Yang Lei , Wang Da Da , Zhou Chao , Zhang Shao Quan , Peng Qing Jun , Rui Xiao Ming
Published: March 2013

With large-scale development of ultra high-transmission network, the structure of transmission line-towers system tends to the tower higher, the cross-section of transmission lines larger and span between towers longer. As the increasing of transmission lines voltage grade, transmission line-towers system has higher requirements on static and dynamic stability. It is difficult for traditional design method to meet the demands of new transmission line-towers, not to mention shorten the design cycle, improve design quality. In this paper, we establish overhead transmission line-towers system model based on parameterized finite element method, by gradually increasing the thickness of the icing, iced load, wind load, weight, mechanical properties under the action of the load and the conductor tension. The analysis results show that the model can effectively reflect the mechanical properties of the transmission towers, and improve the quality of the design, greatly shortening the design cycle.
Wind Power System Optimization Control Simulation
Authors: Huang Yue Hua , Li Guang Xu , Li Huan Huan
Published: March 2013

This paper establishes the wind power system simulation model in Simulink/ Matlab environment. By adjusting the speed of variable speed wind turbine, the simulation model can keep running at the best operation condition, and then achieve maximum power transfer. In this process, this paper use PI controller to track and control the speed of wind turbine. Simulation results show that selecting the appropriate PI parameters can effectively track the speed and increase the efficiency of wind power generation system.
Research and Design of a Power-Balance Controller in Stand-Alone Wind Power Generation System
Authors: Ke Mu , Zhao Qiang
Published: March 2013

Through the characteristic analysis of wind energy carried out, research and analysis on characteristic of Stand-alone Wind Energy Generation System and maths model of the PMSG. Advanced a control strategy with regulate power via adjusting the machine electromagnetic torque-rotate speed use in Stand-alone Wind Energy Generation System, and the wind energy generator automatically track power of load under the rate wind speed. A electronic power conditioner of generator output was designed based on a microchip using this control strategy. It effectively solves the problem of the unbalanced power in the system.
Improvement of the Electric Energy Quality While Using a Super-Compensator
Authors: Rahmouni A. , Mazari B. , Benachaiba C.
Published: March 2013

This paper is a contribution to improve the quality of the electrical energy, of which we study a new compensator that is a combination between a parallel active filter and an UPQC. The two FAP parts use a method of identification of the disruptive currents taking as a basis on calculates it of the reference currents from the components fundamental of the load current relative to the active and reactive continuous powers. that is based on the calculated reference currents from the fundamental components of the load current on the active and the reactive continuous power. That is metered to demonstrate the reliability and effectiveness of this compensator. We were compared it with the UPQC under the same operating conditions. The results of this work have shown that this new control method and highly efficient and super- compensator also gave satisfactory results compared to the UPQC in the case where the load is doubled.
A Study on the Impact of Microgrid Stability Containing Distributed Power
Authors: Zhao Yi , Liu Li , Sun Wen Yao
Published: March 2013

The grid is one of the most important ways of distributed power generation.Micro-grid existence provides a new approach to solve the contradiction between the large power grids and distributed power.This paper studies the stability of Micro-grid contained DG. It establishes the simulation model of typical Micro-grid and studied the impact of transient stability in micro-grid by different fault types and different fault points. Look for the general rules of Micro-grid stability impact by different control mode and different disturbance. Dynamic response curve of Voltage and frequency in micro-grid is reached .Analysis of simulation results, this paper gets the general rule on the effect of stability of Micro-grid.
Bees Two-Hive Algorithm for Optimal Power Flow
Authors: Leeprechanon Nopbhorn , Phonrattanasak Prakornchai
Published: March 2013

This paper presents bees two-hive algorithm for solving the optimal power flow (OPF) problem with various constraints. The objective of the proposed technique is to improve the quality solution of the conventional bees algorithm that minimize the total fuel cost subject to operational and physical constraints i.e. energy balance, generation and transmission limits including security constraints. The proposed methodology is tested on the IEEE 30-bus test system. The results obtained using the proposed approach are compared to GA, PSO, BA and other conventional. The comparison of quality solution with other algorithms confirms performance of proposed technique. Simulation results demonstrate that bees two-hive algorithm provides better results than other heuristic techniques.
An Experimental Investigation on the Bearing Failure Load of Multi-Pin Joints in Composite Laminates
Authors: Xie Yon Gang , Zhang Ji Feng , Cao Zi Zhen , Zhang Lu
Published: March 2013

In this paper, an experimental study has been carried out to investigate the failure load and the failure mode of multi-pin joints of glass fibre reinforced composite laminates which have the stacking sequence of [0/±45/90/0]S subjected to a traction force. The laminates were manufactured by vacuum assisted resin infusion (VARI) and tested with a special fixture. The number of pins was set from 3 to 5, while there were two different arrang styles for each condition. The test results showed that the failure loads were directly affected by the number of pins and arrang styles.The ultimate failure loads increased with the number of pins.
An Efficient Path Replanning Technique for EST-Based Robot Navigation in Dynamic Environments
Authors: Lee Heon Cheol , Lee Tae Seok , Lee Seung Hwan , Lee Beom Hee
Published: March 2013

Expansive-Spaces Trees (EST) is a single-query sampling-based path planner. When EST is applied to robot navigation in dynamic environments, EST confronts the risk of a collision with dynamic obstacles since it has generated a path without any consideration for dynamic obstacles. This paper proposes an efficient path replanning technique for EST-based robot navigation in dynamic environments. The proposed technique replans a collision-free and efficient path instead of the original EST path which may cause a collision with dynamic obstacles. Besides, the replanned path can be easily merged into the original EST path because it preserves the property of EST. Simulation results in various dynamic environments reveal that the proposed technique can successfully replan a collision-free and efficient path for EST-based navigation.
Advanced Waste Rock Exploring by Mobile Robot
Authors: Konecny Jaromir , Kelnar Michal , Prauzek Michal
Published: March 2013

The goal of the work is construction and testing of the mobile robot for waste rock exploring. It is descripted concept of mobile service device with ability to explore waste rock, detect toxic gases and monitors that area. The area of waste rock is dangerous for human, because surface of waste rock is inconsistent and it might be very unstable for human walking. Furthermore dangerous gases can occur in these places. Some of the gases are undetectable by human. Another problem is temperature on the surface. Due these properties on the whole is proper to use mobile robot to explore these places.
A Study on the PUMA560 Robot Motion in ADAMS/View
Authors: Li Chang , Han Xing , Wei Chun Yu , Zhao Guang Bing
Published: March 2013

It proposes an efficient method for kinemics analysis of PUMA560 robot in ADAMS/View in this paper. Comparing with the past, it builds a virtual model of the robot in ADAMS/View. By the way of dynamic simulation, the normal solutions and inverse solutions of the PUMA560 robot are obtained, and this can provide a good study basis for the operability degree and space locus analysis of this kind of mechanics. In addition, a parameterized virtual model of the robot can be build by the ADAMS secondary development technology (APDL), which can accomplish multiple dynamics analysis of the similar kind of mechanics and provide a reliable method for analyzing the effects of mechanical random errors on its motion. This new method needs not to build complex analogue to solve the mechanic, conveniently, shortcut and accurately, and have definite theory meaning and application value in dynamic analysis.
Structure and Lattice Expansion of Pure Sodium Confined inside Nanoporous Vycor Glass at Low Temperatures
Authors: Ghaffar Abdul , Pichl Wolfgang , Krexner Gerhard , Schuster Roman
Published: March 2013

Behavior of sodium metal subject to geometrical constraints has been studied at variable temperatures. A porous medium, Vycor glass of an average pore size of 9.2 nm, was loaded with Na by vacuum vaporization. Synchrotron X-ray powder diffraction of the specimen revealed the existence of close-packed phases such as FCC, HCP, 9R and 4H already at room temperature whereas the bulk BCC phase of Na was completely absent. In contrast, close-packed phases in bulk sodium are only observed at temperatures below 35 K upon cooling. This result can be qualitatively understood in view of earlier zero Kelvin calculations from which it is well known that the differences of structural energies between BCC and close-packed phases are very small. As a consequence, also various close-packed structures can be formed at ambient temperature under certain conditions and environments. The lattice expansion in the restricted geometry has been determined in the range of 160 K to 300 K and compared with the bulk metal. Confined Na exhibits smaller lattice expansion as compared to that of the bulk which likewise can be explained as being due to confinement.
Kinematics Analysis for a 4-DOF Palletizing Robot Manipulator
Authors: Zhao Yong Guo , Xiao Yong Fei , Chen Tie
Published: March 2013

In order to meet theneeds of high-speedpalletizing inlogistics automation industry, a 4 d4-DOF palletizingrobot manipulatorwas designed. Inthis paper,focusing on kinematic analysis, forward kinematics modeland inverse kinematics were introduced in detail.
Finite Element Simulation of In-Service Sleeve Repair Welding of Gas Pipelines
Authors: Alian Ahmed R. , Shazly Mostafa , Megahed Mohammad M.
Published: March 2013

The purpose of this study is to investigate the influence of welding sequence on the risk of burn-through, cold cracking and residual stresses during in-service sleeve repair welding of gas pipelines. Based on ABAQUS software, axisymmetric finite e1ement models were conducted to calculate transient temperature distributions and resulting residual stress field after multi-pass sleeve fillet welding of in-service API 5L-X65 36” Schedule pipes. Influence of welding sequence was investigated by comparing residual stresses and transient deformations for sequential welding; in which welding of the two circumferential pipe/sleeve fillet welds was made in sequence, to the case of performing the two welds at the same time. Sequential welding was found to reduce weld zone distortion and residual stresses due to the sleeve freedom to expand axially while conducting the first fillet weld. The upper limit of heat input was found to generate higher pipe wall peak temperature, but not to the extent of initiating pipe wall melt through.
An Interactive System for Concurrent Engineering Design
Authors: Tan Chee Fai , Kher V.K. , Ranjit S.S.S.
Published: March 2013

The methods in delivering engineering design have gone through evolvement where the effectiveness of conventional methods is decreasing. However, the importance of concurrent engineering design approach has tremendously increased due to the ever competitive world today. This is the reason why engineering designers are concern about the methods of delivering design and one of the recent interests is using interactive system to deliver design. In this paper, the construction of interactive system will be discussed followed by the experimental setup. Experiments will be conducted in the form of performing few selected tasks with the interactive system and comparison will be made with the conventional design approach. Comparison will be done by collecting feedback through questionnaires from the participants who are involved in the experiments. Feedback will be analysed to identify the feasibility of interactive concurrent engineering design system.
Modeling of Flight Arrival Scheduling Based on Fuzzy Programming
Authors: Chen Jiu Sheng , Zhang Xiao Yu
Published: March 2013

The issue of flight arrival in civil airport is a typical problem of discrete event dynamic system. IN Time is a random variable. According to the characteristics of arrival flights, flight delay cost as objective function, the fuzzy model for scheduling arrival flights is established. In the case of growing air traffic, the model is a better opinion for scientific optimum ordering matter in air traffic control system. It can improve flight operation on time.
Dynamic Analysis and Simulation for Bionic Power-Assisted Legs of Hill Area Agricultural Machinery
Authors: Zhou Ke Dong , Wang Jin Ge , Li Jun Min , Liao Jiang Mei
Published: March 2013

According to a series of hill area issues, such as big steep gradients, small and disperse plots, agricultural machinery climbing restriction and so on, a new 2-DOF bionic power-assisted legs mechanism driven by hydraulic is proposed. This paper states the design principle of the bionic legs mechanism and its application in agricultural machinery. A dynamic model is used to show how the hind leg assisted agricultural machinery is established, and then deduce the dynamics equation, and solve the inverse dynamics problems. The result shows that agricultural machinery movement along slope is steady with the help of the hind leg, and driving force of hydraulic cylinder changes is slightly without any distinct impact to other devices, the actuated project is feasible and the structure design is reasonable, and it can be used to research on intelligent control of bionic legs and hill area agricultural machinery.
Research on the Folding and Deploying Mechanism with Analysis of Frictional Coefficient of Steel and Aerodynamic Resistance
Authors: Li Yao Yao , Jiang Chun Lan
Published: March 2013

In this article the folding and deploying mechanism is researched, the equivalent dynamical model is built, and the configuration of the folding and deploying mechanism is designed including the folding mechanism, the deploying mechanism and the locked mechanism. This paper obtains the athletic rule of folding and deploying mechanism, then analyses the dynamic time of the folding and deploying mechanism and the reliability of the locked mechanism, also analyses of frictional coefficient of the steel and aerodynamic resistance of the mechanics.
Research on Flow Field of Double-Nozzles Bottom Blowing CAS Process with Properties of Liquid Metal through Numerical Simulation
Authors: Zhou Meng
Published: March 2013

The Fluid Flow of Liquid Metal in Ladles of CAS-OB Refining Process Is a Complicated Turbulent Transmission Process. it Behaves much More Complicated than in Traditional Ladle because of Immersion Snorkel. this Paper Describes Properties of Liquid Metal Based on Full Buoyancy Model. the Author Analyzes the Characteristics of Flow Field in Single and Double-nozzles Bottom Blowing Condition through Numerical Simulation Method. Double-nozzles Bottom Blowing Could Improve Blending Effect in the Region where Is Weak Mixing. this Paper Also Draws an Empirical Formula which Tells how Gas Blowing and Immersion Depth Influence Mixing Time in CAS-OB Ladle through Dimensionless Analysis.
The Industrial Structure Evolution Analysis and Optimization Measures in Pingxiang
Authors: Chen Dong , Jiang Yun
Published: March 2013

This paper analyzes the Pingxiang City,1997-2009, three industrial structure data to explore the characteristics of its industrial structure and the transformation of the industrial structure optimization countermeasures.
The Influence of Rotating Magnetic Field on DCEN MAG Industry Welding Based on Properties of Welding Materials
Authors: Wang Xu Ming , Liang Wei , Sun Su Hong
Published: March 2013

This paper introduces that the transverse rotating magnetic filed, of which excitation current and frequency can be altered respectively, is applied to the DCEN (direct current electrode positive) MAG industry welding with the shield gas of (Ar) 98%+ (O2 ) 2%. And its mechanism is researched carefully using high velocity camera.When fixing excitation frequency or excitation current, arc motion behavior, droplet transfer, wire melting coefficient and properties of welding materials are researched. Welding spatter results from arc luminous sphere bouncing up and down. We compared DCEN MAG industry welding with DCEP (direct current electrode negative) in order to further perfect rotating MAG industry welding.
Study on Materials Flow Destruction Causes to the Shape Change with New Method of Proving a Specific Energy Theory
Authors: Zhao Yuan Qin
Published: March 2013

The three principal stresses of unit body correspond to the three circles of stress. Each circle of stress corresponds to one of the biggest shear stresses. Each of the biggest shear stresses corresponds to a shear stress’s specific energy. Therefore, specific energy of unit body is solved. It is compared with specific energy of shear stress, staying a dimensional state of stresses with materials flow destruction. And people can get a common formula about specific energy theory of the shape change during the engineering design. The new method’s proving process is very simple, and the nature of failure mechanism is clearer.
Key Technological Parameters of Laser Cutting for Stainless Steel
Authors: Chen Ying Ying , Feng Wen Jie , Wang Li Feng
Published: March 2013

Effect of temperature to associated thermal physical characteristics is analyzed by establishing laser cutting model for stainless steel. Experiment shows the position of focus has an effect on cutting quality. Perfect positions of focus for different thickness are advanced. On this basis, applying the law of conservation of energy, where the total heat absorbed is equal to the sum of absorbed by melting and lost by conductive, heat onduction equation is set up. The function relation among cutting speed, thickness of plate and power is defined, which is verified to get perfect cutting quality in TRUMPF L3030. The formulations provide theoretical and practical support for actual laser cutting of stainless steel.
Research on Environmental Materials with Variation of Pollutant and Environmental Factor in Underground Environment
Authors: Hu Hong Tao
Published: March 2013

The removal efficiency of pollutant in an enhanced remediation with a permeable reactive barrier (PRB) was studied in this paper. The experimental results showed that the DO value has varied obviously because of the oxidation and reduction near the electrodes, i.e. the pH value near the anode changed from 6.3 to 7.9 but near the cathode it varied from 6.5 to 6.4 in the experiment process, which inflected that the variation content of the DO near anode chamber was bigger than that of the anode chamber during the electrokinetic remediation process. The removal efficiency of Cd was respectively 63.91% near the anode and 86.79% near the cathode, and the removal efficiency of COD was respectively 44.86% near the anode and 90.31% near the cathode at the end of experiment when the experimental voltage gradient was 0.35V/cm, which indicated that this new enhanced electrokinetic remediation of groundwater was more effective method than that of ordinary PRB containing environmental materials.
The Study on Subsurface Damage Depth and Morphology of Optical Material
Authors: Yang Wei , Ye Hui
Published: March 2013

The paper is mainly to research the subsurface damage depth and morphology on grinding and polishing substrates on optical materials, and analyze different subsurface damage morphologies caused by different processing technologies. The best etching solution is selected by experiments, grinding and polishing substrates are etched for proper time by divided stages. Use 120×optical microscope and scanning electronic microscope to observe subsurface damage morphology and Taylor Hobson PGI1240 to measure the etching depth to obtain the subsurface damage depth.
The Application of Biological Materials of Carpal Articular Cartilage in Athletic Injury
Authors: Yan Shi Fang , Zhou Song Shan , Hou Jiang Yuan
Published: March 2013

This paper investigated the effect of biological materials on rehabilitation carpal articular cartilage injury in athletic injury, which aimed at provides ideal biological materials for the injury repair and functional reconstruction of carpal articular cartilage injury. Arthroscopic micro fracture technique combined with hyaluronic acid gel can improve the thickness of cartilage regeneration, which is more close to the hyaline cartilage; Calcium polyphosphate fiber / gelatin composite scaffold can meet the needs of tissue engineering scaffold composite porosity; Auto-genous periosteal graft fixation of bone marrow mesenchymal stem cells can promote the repair, generation and self-adaptation of articular cartilage. the carpal articular cartilage injury is common in exercise and training due to wrist joint physiological structure and biomechanical characteristic, tissue engineering of cartilage repair implant the cells and scaffold composite into the damaged tissues or organs, so as to achieve the purpose of wound repair and functional reconstruction, which provides a effective way for wrist joint cartilage injury.
Research on Performance Analysis and Application of Energy-Saving and Eco-Friendly Building Materials
Authors: He Chang Quan
Published: March 2013

Purposes:Through this paper we can know how to choose building materials more healthy. Methods:We analysed the performance and application scope of common energy-saving and eco-friendly building materials. Results:China’s building materials industry must take measures by means of system construction, promotion model, economic support to expand the application range. Conclusions:We should make more efforts to promote green building materials, establish the assessment system of green building materials.
Determination of Organochlorine Pesticides in Water Samples through Hollow Fiber Membrane-Liquid Phase Microextraction Using Ionic Liquid Material as Extractant
Authors: Huang Du Shu , Chen Ya Shun , Yan He Ping , Wu Na , Liu Wei , Wu Jie
Published: March 2013

A novel method for determination of organochlorine pesticides residuals (2,4-DDT and 4,4-DDT) in water samples through hollow fiber membrane-liquid phase microextraction using ionic liquid material as extractant coupled with high performance liquid chromatography has been developed. The effect of extraction parameters including pH of the feed solution, stirring rate and extraction time was investigated. The proposed method provided enrichment efficiency of 323 and 289 for 2,4-DDT and 4,4-DDT respectively. The method had good linear range of 0.5-50 μg /L and the limits of detection of the pesticides were 0.1 μg /L.
Effect of Slag Composition on Fatigue Life of High Speed Wheel Steel
Authors: Tang Yu
Published: March 2013

In order to improve fatigue life of wheel steel, secondary-refining process was done with Al-deoxidation and slag of high basicity, high Al2O3 content and low oxidizing property. By morphology observation and composition analysis with FESEM, it is found that during LF-VD process, by slag-steel-inclusion interaction, Al2O3 inclusions could transform to MgO-Al2O3 spinel, and later on to CaO-MgO-Al2O3 inclusions, which are inclined to be eliminated by floatation, lowering T[O] content to 0.0007%, enhancing fatigue life of wheel steel. By In-Situ observation with CONFOCAL laser scanning microscope, it is found that MnS precipitates during solidification process, which would core oxide inclusion to form MnS-oxide complex inclusion, contributing to fatigue life improvement of wheel steel. By INSTRON fatigue testing machine, it is found that by successful inclusion control, tested samples achieve ultra-high cycle of 108 above, realizing experimental purpose of improving fatigue life of wheel steel, boosting domestic production process of CRH high speed wheel steel.
Influence of Weld Parameter on Penstock Joint of B610CF-16MnR Steel
Authors: Chen Yun Chun , Liu Wen Min , Yang Hou Sen , Zhang Tian Hui , Yan Pei Jun
Published: March 2013

Weld parameter is an important factor affecting micrographic structure and mechanical properties of weld joints. It was investigated by metallographic experiments and mechanical property experiments for the influence of weld heat input on dissimilar steel weld joint of penstock using B610CF and 16MnR steel in water conservancy and hydropower engineering using shielded metal arc welding method and mixed active gas arc welding method. Metallographic experimental results show that in weld metal with the increase of weld heat input the quantity of bainite decreases and crystalline grain is larger when using the same welding method; but in both B610CF and 16MnR steel heat affected zone, there is no distinct difference in microstructure. Mechanical property experimental results show that in weld metal with the increase of weld heat input the impact toughness decreases when using the same welding method, but in both B610CF and 16MnR heat affected zone, there is less difference in impact toughness; and there is no distinct difference in tensile strength and plasticity of weld joint. So moderate weld heat input is recommended.
The Research Progress of the Modified Cellulose Magnetic Microspheres Adsorption of Heavy Metal
Authors: Sun Jia , Liu Xin Zhong , Peng Lei
Published: March 2013

The modified cellulose magnetic microsphere is magnetized on the modified cellulose. It combines the properties of the modified cellulose and the advantages of the magnetic adsorption technology together. This paper summarizes the method of preparation of modified cellulose magnetic microsphere and application of its adsorption of heavy metal. Further, this article raises the improvement methods to obtain the better performance of the finished product, thereby enhancing the cellulose adsorbent flexibility and breadth of application.