bluuebunny/crossref_metadata_2025 huggingface dataset:
The Research on the Surface Temperature Field of the Gas Cooler in the Microchannel
Authors: He Bing Qiang , Liao Chun Ling , Chen Ji Yong
Published: July 2012

Empirical studies on the heat exchange characteristic of the span borderline CO2 of the parallel flow gas cooler in the hol-aluminium microchannel and the surface temperature distribution of the gas cooler during heat exchanging of the span borderline CO2. Through experiments we got the surface temperature distribution of the cooler in the wind. These studies provide evidences for the design of the hol-aluminium mirochannel parallel flow gas cooler in the carbon dioxide automobile air conditioning system.
The Design of a Security System for 13° Wheel Strike Testing Rig
Authors: Zhang Xin Ming , Yue Kai , Wang De Min , Bai Xue Song
Published: July 2012

With heavy mass and free falling body movement, the hammer is very dangerous and unstable during testing, so testing machine by the component systems of the research, designing a security system,including the mechanical structure of the safety design and safety of electrical control system design. In particular, the safety raising and releasing mechanism is designed to enhance the use of friction to achieve self-locking latch device functionality, so pin lock to prevent accidental operation errors will pull out, hammer will not be down. During the experiment, system have a good protection.
The Mechanism Design and Testing Study on Accelerator Based on The Internal Parallel Moving Gears
Authors: Wang Guo Sheng , Ma Guo Xing , Wang Dong Liang , Long Zhen Xin
Published: July 2012

Particular requirements to the Accelerator’s mechanical characteristic were put forward firstly. According these requirements, the Internal Parallel Moving Gears (IPMG) was proposed to be served as the accelerator used in the Electro-Magnetic Suspension(EMS). And its parameters of the EMS were calculated and optimized for the general layout of a special vehicle. Then in terms of the design results, the accelerator was trial-produced and tested. The experiment results indicated that the IPMG could realized big drive ratio in small volume really, but there was so difficult in machining, assembling, disassembling as in maintenance. In addition, because of its structure, it was not fit to transfer big force or high power but fit to transfer motion with middle or small power. Therefore, it was not suitable to act as a accelerator used in the EMS
Practicably Optimal Point and its Solution in Deterministic System
Authors: Li Ruo Ping , Kong Xiang Yong , Gao Li Qun , Zou De Xuan
Published: July 2012

In some cases, it’s not enough to consider only the objective function of the global optimal point, but also the character of this point and its nearby area. To this end, the concept of practicably optimal point is introduced in this paper. Further, a novel intelligence method named simulated particle swarm optimization (NSPSO) algorithm is proposed to obtain the practicably optimal points according to different requirements. The optimization results reveal that the NSPSO algorithm has strong convergence and stability, and appears to be an efficient alternative for obtaining the practicably optimal points according to different requirements.
Predictive Modeling of the Performance of the Hydrocyclone with Different Cone Combination
Authors: He Feng Qin , Wang Hua Lin , Tan Yong Hong , Wang Jian Gang , Zhou Ping , Seong Chun K.
Published: July 2012

The gypsum dehydration hydrocyclones, with cone combination of 20-10° (bi-conical), 10° (single-cone) and 8-10 ° (bi-conical), were investigated in this article. Sampled data were obtained from the separation experiments. The MATLAB neural network toolbox was used to build 3-layer BP neural network models. The resultant of separation performance prediction errors show that it is feasible to build a predictive separation model for hydrocyclones with neural network. And the built model can serve as an effective method for the design of cyclones.
Revenue-Sharing Contract of Three-Level Supply Chain under Disruption
Authors: Pang Qing Hua , Jiang Hui , Lu Tian Tian
Published: July 2012

Revenue-sharing contract is studied under disruption. An optimal strategy for supply chain to deal with the disruption is given and an improved revenue-sharing contract which has anti-disruption ability is proposed. It also analyzes the distribution of profit among the entities. Finally the paper gives an application by simulation.
The Application of BP Neural Network to Comprehensive Assessment in Equipment Maintainance Support
Authors: Wu Jia Ju , Cao Bing Ning , Wan Zheng Jing , Zhang Ji Lan
Published: July 2012

Equipment maintainability support is the most important influencing factor which affects weapon battle ability. Equipment maintainability support capability assessment result can be used as steering for equipment maintenance blue print configuration. Based on analysis of equipment maintenance support, maintenance scenario establish process is discussed in paper. Then neural network-based equipment maintainability support assessment model is established. BP dynamic neural network is applied in constructing model and the amelioration weight reset arithmetic is imported in equipment maintainability support assessment model. Finally, the steps of equipment maintenance support assessment are described. According to assessment arithmetic, equipment maintenance center computes assessment result. Equipment development department and army can optimize maintainability support scheme based on assessment result and maintain equipment.
The Research of System Security Based on .NET Platform
Authors: Zhou Jing
Published: July 2012

This article tells the story of in order to effectively resist the invasion of external .NET platform system, improve system security, we must establish the prevention and monitoring technologies improve system security system. System programmer and administrators only in the system design stage, to do a good job safety prevention programs and solutions to security applications wherein, to nip in the bud, development of safer, more reliable and robust web system; 安and this paper Analysis the possible security problems of the .NET platform system; in view of the existing safety problems to make the safety performance analysis; finally put forward the platform system safety prevention programme.
The Uncertain Programming of the Closed-Loop Supply Chain with Remanufacturing System
Authors: Chen Yu Juan , Liu Dong Bo , Mao Hong Wei , Zhang Zi Qiang
Published: July 2012

This paper addresses an integrated uncertain programming model for a closed-loop supply chain with manufacturing/remanufacturing hybrid system. The hybrid system is studied under the grey fuzzy uncertainty and grey uncertainty. The hybrid intelligent optimization algorithm integrating the grey fuzzy simulation, neural network and genetic algorithm can optimize the uncertain model. One numerical example is given to illustrate the effectiveness of the proposed model and algorithm.
Three Dimensional Numerical Analysis of Plasma Spraying Using Supersonic Plasma Gun
Authors: Hu Fu Sheng , Wei Zheng Ying , Liu Bo Lin , Du Jun , Tan Chao , Han Zhi Hai
Published: July 2012

Numerical method is applied to analyze the spraying process using supersonic spraying gun; special attention is paid to temperature and velocity fields of argon plasma flow, including. In term of plasma properties, ionization and recombination of plasma species are taken into consideration. The impact of internal injection channel on main plasma gas flow, both velocity and temperature, are investigated. With full dimensional model, three dimensional properties of plasma flow and internal injection channel impact are revealed.
Finite-Element Analyze of D-Post on Numeric Controlled Gear Hobbing Cooperative Working Machine Based on ANSYS
Authors: Zheng Shu Zhi , Zhang Guang Lei , Zhang Chun Xiang , Zhao Yuan
Published: July 2012

This paper completed the CNC milling machine upright post joint mechanics modeling, and using ANSYS software column models are static and modal analysis, according to the results of analysis to find out the weak link in the design, and puts forward the improvement methods.
The Effect of Temperature and Solvent Concentration on the Nanomotor Motion by Molecular Dynamics Simulation
Authors: Zhang Guang Yu , Sun Qian , Li Long Qiu , Wang Lin
Published: July 2012

Nanomotors are nanoscale devices capable of converting energy into movement and forces. In this work, a molecular dynamic model based on a chemically powered nanomotor is established. Based on molecular dynamics, dynamics and kinematics analysis have been made, and the motion of the model has been simulated. Finally, we get the effect of the temperature and the solvent concentration on the nanomotor motion respectively. The center-of-mass velocity of the nanomotor along its axis increases roughly linearly with low temperature, and then gradually reaches a maximum value. The center-of-mass velocity of the nanomotor along its axis increases roughly linearly with low solvent concentration, and then gradually reaches a maximum value.
Design of Virtual Store Roaming System Based on Virtools
Authors: Shen Guo Qiang , Xu Jing Jing
Published: July 2012

According to the phenomenon that most website display products through the form of two-dimensional and can not resolve interactive issue between users and virtual scene. This paper design a virtual roaming system which uses 3ds max to perform modeling for all the scenes in the store and make dynamic interactive design for model on Virtools platform, and study two types of collision detection. In this roaming system, users can walk freely in the store and operate interested in commodities independently like entering the real world.
Dynamic Simulation of the Heat Exchanger Based on Simulink
Authors: Tang Yu Xiang , Chen Fu Huan
Published: July 2012

Based on the MATLAB software of Simulink to dynamic simulation for heat exchanger.This paper tries to set up the transfer function of the heat exchanger to get the dynamic characteristic simulation curve,and so as to improve the efficiency of using the heat exchanger provides the basis.
Fitting Algorithm of Parameterized Continued Fractions with Keeping Endpoints and its Application
Authors: Zhan Tang Sen , Zhao Wei
Published: July 2012

In order to overcome fitting uncertainty, A nonlinear rational parameterized fitting algorithm with keeping endpoints was presented through inverse difference-continued fraction algorithm, the algorithm has property of keeping endpoints, parameterization of middle data points selected. The parameters obtained through minimum error function make fitting functions have much flexibility. Experimental results illustrate that the proposed algorithm may reduce degree of continued fraction interpolation function, numbers of iteration and avoiding non-existence on interpolation function of the continued fraction.The fitting values obtained are more accuracy, the computing efficiency is much more improved,the fitting errors are more stable, approximate effect is better, and the algorithm will be widely used in predict etc.
Based on Energy Loss Analysis Theory to Analysis Operation Parameter and Coal Consumption of 300MW Power Plant
Authors: Liu Kai Rui , Yang Jun Bao
Published: July 2012

Introduced the theory of the Energy loss analysis and lots of Energy loss analysis methods and utilized the basic formula method to analysis the influence of some operation parameters of a foreign designed 300MW coal-fired power plant to coal consumption in the variety loads. Applied matlab to make a figure, which contained the influence of some operation parameters of a foreign designed 300MW coal-fired power plant to coal consumption in the variety loads. Compared analysis the results, and gained the energy saving direction, so it conducted the operation of these units and optimized it.
48″600lb Full-Welded Ball Valve Wall Thickness Optimal Design
Authors: Mo Chun Li , Tang Xing Wei , Guo Xu Ming
Published: July 2012

Fully-welded ball valve has been applied in large oil and gas pipelines, and its quality is directly related to the safety of the transportation of national energy. The wall thickness of 48″600lb ball valve is greater than theoretical design thickness. In this article, FEM software was used to design minimum wall thickness using linear stress analysis method. Though changing wall thickness under design pressure, the minimum wall was 85mm which calculated by linear stress analysis method can provide theoretical support for practical engineering application
A Computational Study on Structures, Stabilities and Electronic Properties of Chloro Silsesquioxanes Si2nO3nCl2n (n=1-5)
Authors: Zhang Cheng Gen , Yu Shu Yuan , Cao Zong Ji
Published: July 2012

Density functional theory (DFT) calculations were performed to investigate the structures of chloro silsesquioxanes Si2nO3nCl2n (n=1-5). Our study focuses on the structures, stabilities, and electronic properties of the chloro silsesquioxanes. The large HOMO–LUMO gaps, which range from 4.54 to 7.39 eV, imply optimal electronic structures for these molecules.
Analysis of Concrete Bridge Asphalt Pavement’s High Temperature Stability
Authors: Jiang Hong , Yuan Jian Bo , Yang Hua
Published: July 2012

The asphalt pavement of cement concrete bridge belongs to thin structure, its high temperature stability is an important indicator. Using self-made heating system, through test on full scale linear track, conduct on-site rutting survey, and supplemented by the identification of drill core samples and laboratory test of pavement’s rutting, research on asphalt pavement's high temperature stability on the bridge. The research results not only provide a strong basis to the concrete bridge asphalt pavement mix design, but also provide some reference to similar engineering practice.
Analysis of Optimization Method for OGFC Mixture Gradation Design
Authors: Ouyang Lan
Published: July 2012

Taking OGFC-13.2 (target porosity: 16%) as an example, this paper analyzes the shortages of current specifications on OGFC gradation design, and proposes an optimized design method for OGFC mixture. Then the Bailey method was used to detect whether the target mix can make the mixture constitute a skeleton structure. Finally, the rationality of new design method is verified through several conventional experiments with recommended gradation. New design method with clear thinking and good operability, can better guide the OGFC gradation design.
Compressive Creep Behavior of Mg-4Al-1RE-1Ca-0.2Sr Alloy
Authors: Xu Dao Fen , Du Chun Ping , Ye Dong
Published: July 2012

The compressive creep behavior of Mg-4Al-1RE-1Ca-0.2Sr (AECJ411002) alloy was investigated at temperatures in the range of 125~175°C and different compressive stress in the range of 88~112MPa with special apparatus. The results show that the creep deformation increases with the increasing of temperature and compressive stress. There is linear logarithmic relationship between the steady creep rate and all the temperature and stress used. The steady creep rate obeys an empirical equation. The stress exponents are similar at different temperatures and the appearance activation energies are not greatly different under different stresses. Their average value is respectively 6.19 and 39.05kJ/mol. Material constant A is 4.18×10-14. The steady creep rate is controlled by a dislocation climb led by grain boundary sliding. The creep resistance enhances because of the heat-resistant phases Al2Ca and Al4Sr distributing at grain boundary.
Design of Welding with Trailing Peening System for Reaction Nitrogen Arc Welding Cladding
Authors: Li Xiong Zhuang , Hao Jian Jun , Li Jian Chang , Zhao Jian Guo , Ma Yue Jin
Published: July 2012

In order to reduce welding stress, decreased welding crack and improve coating performance, a set of complete computer control system was designed and applied to prepare TiCN cermet composite coating by process. The system, which consists of PC, SCM (AT89C52), sensor, interface circuit, pneumatic rammer, corresponding mechanism and valves, can peen the welded seam by a pneumatic rammer which is controlled by the signal from data acquisition card. The system can easily adjust the peening frequency, force, distance, and angle able. The result show that the system can make coatings more inseparable and compacter, less weld defect, and the coatings have an excellent mechanical property.
Effect of Particle Size Distribution on the Properties of Sand Mold by Three Dimensional Printing
Authors: Zhao Huo Ping , Ye Chun Sheng , Fan Zi Tian
Published: July 2012

In this study, three dimensional structures are fabricated by a self-developed three dimensional printing machine with eight different particle size distribution scrubbed silica sand. In order to evaluate particle size distribution effect on the properties of sand mold, the physical and mechanism properties of printed specimens, including weight, gas evolution, air permeability, tensile strength and compressive strength, were measured. The mechanism of effect was analyzed and studied. The results show that the printed specimens from the 80-140 mesh sand powder have the best comprehensive properties. Both wider and narrower particle size distribution adversely affects the properties of printed specimens.
Electroless Deposition of Silver Layer on Atomic-Layer-Deposited TiN
Authors: Lee Yuan Gee
Published: July 2012

A laminate of silver/atomic layer deposition TiN/Si was prepared to research the thermal reliability. The atomic layer TiN was subjected into different kinds of plasma to modify its surface chemistry. The surface tension of the TiN/Si surface was found to be reduced by O2 plasma bombardment. The reaction mechanism of the continuum of silver film was also explored in this paper.
Improved Design of Long Tunnel’s Cement Concrete Pavement Slab Length
Authors: Jiang Hong , Yuan Jian Bo , Yang Hua
Published: July 2012

Temperature field on the road inside the tunnel has a significant difference with normal road surface temperature field, according to the actual situation of the temperature inside the tunnel, calculate the slab length of the cement concrete pavement, obtained the conclusion that cement concrete road slab can be longer inside the tunnel, the conclusion has practical significance for the construction of cement concrete pavement inside the tunnel.
Microstructure Evolution of Hydrogenated Ti6Al4V Alloy during Compression
Authors: Yuan Bao Guo , Chen Qiang , Yu Hai Ping , Li Ping , Xue Ke Min , Li Chun Feng
Published: July 2012

Compression tests of the hydrogenated Ti6Al4V0.2H alloy were carried out using an Instron 5569 machine at room temperature. True stress-strain curves of the hydrogenated Ti6Al4V0.2H alloy under different compressive strains were obtained. Microstructure evolution of the hydrogenated Ti6Al4V0.2H alloy during the process of compression was investigated by optical microscopy and transmission electron microscopy. Results show that true stress-true strain curves of Ti6Al4V0.2H alloy have good repeatability. The deformation of grains, the dislocation density and slipping evolution during the process of compression are discussed.
Preparation and Properties of Poly-2,5-dihydroxyaniline/Activated Carbon Composite Electrode
Authors: Sun Miao , Wang Wei , He Ben Lin , Sun Ming Liang , Sun Fan , Liu Wei , Ge Hong Lun , Zhang Qin Jie
Published: July 2012

Poly-2, 5-dimethoxyaniline (PDMA) coating was successfully prepared by electrochemical method on the surface of active carbon (AC) electrodes in oxalic acid aqueous solution. The resulted coating was hydrolyzed to produce poly-2,5-dihydroxyaniline (PDHA) to enhance the capacitance of the composite electrode. Scanning electron microscope (SEM), cyclic voltammetry (CV), galvanostatic charge/discharge test, and electrochemical impedance spectroscopy (EIS) were used to investigate the properties of these electrodes. A comparative analysis on the electrochemical properties of bare-carbon electrode was also conducted under similar conditions. The specific capacitance of the PDHA/AC composite electrode was 947.04 F•g-1 between 0.0 and 1.0 V at a current density of 3.0 mA•cm-2 in 0.5 M H2SO4 electrolyte. The capacitance retention of composite electrode was about 89.2% during 700 charge-discharge cycles.
Change Order Audit in Machinery Enterprise Base on the Delivery Schedule and Loss Cost Estimate
Authors: Chen Jian Qing
Published: July 2012

When order change happens, enterprises hope to be able to estimate the earliest/latest and loss cost. This can help make the produce plan and meet the delivery time requirements of customers. In this paper, model to estimate the loss cost and delivery time caused by order change is built. Also, method to audit order change by level constraint is proposed.
Research on Interfacial Cracking of a Cr Coating/Steel Substrate with and without Laser Pre-Quenching Treatment under Thermal Fatigue Loading
Authors: Yang Ban Quan , Chen Guang Nan , Chen Xue Jun , Sun Wei Hai , Chen Hong Qian , Pan Jing Wen , Chen Ying
Published: July 2012

The interfacial cracking behaviors of a chromium (Cr) coating/laser pre-quenched steel substrate system and a Cr coating/original steel substrate system under thermal fatigue loading were investigated in this work. The experiment results show that the Cr coating on the pre-quenched substrate surface exhibited a higher resistance of interfacial cracking than that of the Cr coating on the original substrate surface under the same loading condition. This indicates the technology of laser pre-quenching of steel substrate surface prior to plating the Cr coating can improve the interfacial adhesion properties between the coating and substrate.
Strength Analysis and Calculation of JJ225/42-KC Type Oil Rig Derrick
Authors: Yi Xian Zhong , Jiang Sheng Zong , Ji Yuan Qiang , Feng Ding , Gao De Li
Published: July 2012

Abstract. Oil rig derrick is a large and complex metal frame with lots of bars and complex force. Moreover, the use of working condition is complex and harsh, so it is quite necessary to analyze strength and calculate oil rig derrick. In this paper, with the basic structure and force characteristic of JJ225/42-KC type oil derrick, the ANSYS finite element software is used to establish JJ225/42-KC type oil derrick structure finite element model. The strength and stability analysis of the maximum hook load working condition, the working wind load working condition and the maximum wind load working condition of three combined working conditions indicates that the overall structural design of JJ225/42-KC type oil derrick is reasonable with good both dynamic and static characteristics and the derrick meets the requirements of the strength. What is more, the derrick has a excellent overall stability. In the end, the strength of the lifting devices and the derrick leg pin of JJ225/42-KC type oil derrick are calculated and checked, showing that all meet the requirements of the strength.
Characteristic Analysis of Francis-Turbine in Cooling Tower
Authors: Zhang Lan Jin , Wang Lei , Ren Yan
Published: July 2012

The water turbine stands in the cooling water system and drives the fan in the cooling tower, so its flow rate, head and output is limited to the flow rate of cooling water, saved-energy of pump and input of fan separately. The spiral casing dimension of water turbine is limited to the diameter of tower. All above facts make the water turbine of cooling tower be different to that of water power station. The paper introduces one turbine which flow rate is 0.139m/s. Its characteristic of flow passage and hydraulic performance is analyzed, and some new flow passage to improve hydraulic performance is suggested.
Thin-Layer Drying Characteristics and Modeling of Paper Sludge
Authors: Xiao Han Min
Published: July 2012

In this paper, the drying experiments of paper sludge were performed at different drying conditions. The drying kinetics and phenomena of paper sludge were investigated. The effective diffusivity and the activation energy of the paper sludge during drying had been evaluated. At the same time, seven empirical models were used to model the experimental data, such as Newton, Page, Modified Page, Henderson and Pabis, Logarithmic, Two term, Two Term exponential et al. Three statistical parameters (The coefficient of determination (R2), root mean square error (RMSE) and the residual sum of square (RSS) ) were used to evaluate goodness of fit of the tested models.
TiCN Cermet Composite Coating Prepared By Reaction Nitrogen Arc Welding Cladding Process
Authors: Hao Jian Jun , Ma Lu Ping , Gao Liang , Ma Yue Jin , Zhao Jian Guo
Published: July 2012

A TiCN cermet composite coating was fabricated on 45# steel substrate by reaction nitrogen arc welding cladding technique. The mixture powder of titanium and graphite was preplaced onto the 45# steel substrate after intensive mixing by star ball-mill and gluing with starch binder. The microstructures and phase of the coatings, interracial behavior between coatings and the substrate were investigated by scanning electronic microscope, X-ray diffractometer. The microhardness distribution of the coating section, frictional coefficient, abrasion loss and wearing surface morphology were investigated by microhardness tester, abrasion machine and scanning electronic microscope. The results show that an excellent bonding between the coatings and the 45# steel substrate is ensured by the strong metallurgical interface and phase of the coatings are mainly composed of TiCN. The highest microhardness of the coatings reaches HV 0.5 810, which is about 3 times more than that of the 45# steel substrate. The anti-abrasive test results show the coating has better anti-abrasive performance than the 45# steel substrate.
Woodceramics Prepared form Liquefaction Wood and Wood Powder
Authors: Sun De Lin , Yu Xian Chun , Sun De Bin , Wang Rong
Published: July 2012

A woodceramics makes from liquefaction wood and wood powder, the basic property connects with sintering temperature and liquefaction wood content. Thermo gravimetric analysis indicates that higher liquefaction wood content lead to reduce the weight loss. Scanning electron microscopy observation shows that wood powder is as a natural plant template and the basic structure of wood can partly keep. The apparent density increases before about 1100°C, and then decreases as temperature gets further; but the apparent porosity increases continuous; bending strength increases from 8.45 MPa to 11.87 MPa when the liquefaction wood content raises 60%-120%. Meanwhile, elevation of liquefaction wood content and sintering temperature can reduce abrasion loss.
Research and Development of High Strength Architectural Heavy Plates
Authors: Tong Ming Wei , Yuan Ze Xi , Zhang Kai Guang
Published: July 2012

This paper provides a detailed description of high strength architectural heavy plates with 80mm in thickness developed at Wuhan Iron and Steel（Group）Corporation(WISCO). The chemical composition of plates contains mainly C-Mn-Nb-V-Ti with proper content of other alloys, and the thermal-mechanical controlled process and normalizing treatment were applied. The results show that the base plates manufactured at WISCO have a good match of high strength, good through-thickness characteristic, low yield ratio and low temperature toughness with fine microstructure, and the fracture transition temperature is about -40°C. The welding plate also has high strength and good low temperature toughness which comprehensively meet the technical requirement of large-scale architectural buildings.
Study of Micro-Arc Oxidation Process in Magnesium Surface
Authors: Chen Ze Min , Lu Pin , Dong Qiu Hong
Published: July 2012

This study selected sodium silicate, sodium fluoride, glycerol hydroxyl acid, potassium hydroxide and phosphine oxide (LAP) as the stabilizer electrolyte, and then on micro-arc oxidation of magnesium with constant current density. The microstructure, corrosion resistance, chemical composition, structure and characterization of micro-arc oxidation film were determined by SEM and anodic oxidation methods. Experimental results indicated that the test pieces of magnesium would formed an silver-gray uniform densification oxide film on the surface by micro-arc oxidation treatment, and the corrosion resistance of magnesium film-formed had increased by potentiodynamic polarization curve testing.
Numerical Study on NO Mechanism during High Temperature Air Combustion of Natural Gas
Authors: Su Ya Xin , Chen Cui Wu
Published: July 2012

A full nitric oxide mechanism including thermal NO, prompt NO, N2O intermediate model and NO reduction model through reburning was used to calculate the NO formation during high temperature air combustion of natural gas in industrial furnace. The turbulent transportation was simulated by Reynolds stress model (RSM) and a modified Eddy-Break-Up (EBU) combustion model was applied to model the combustion process. A three-step reaction scheme of the natural gas combustion reaction was considered. Experimental data from published literature was adopted to validate the present models. Numerical results showed that thermal NO formation mechanism and reburning NO reduction mechanism were the dominant NO models. Reburning NO reduction could not be ignored. Prompt NO gave a small contribution to NO emission and the N2O intermediate model for NO formation was of little importance.
The Influence of Shadow Mask Technique in Sulfur Hexafluoride Plasma on PES Surface Wettability
Authors: Chuang Miao Ju , Wang Jee Ray
Published: July 2012

High hydrophilic/hydrophobic contrast surfaces on polyethersulfone (PES) samples were formed by shadow mask technique in electron cyclotron resonance generated sulfur hexafluoride plasma atmosphere. The plasma-treated polymer film surface properties are characterized using contact angle measurement. The contact angle measurements clearly indicate that the unmasked areas on the polymer surfaces were hydrophobic with a large water contact angle and therefore decreased the surface wettability. The masked areas on the polymer surfaces increased surface wettability. In addition, the surface wetting property of the masked areas was found to change significantly with the plasma treatment time, the mask-to-substrate distance and the storage time after the treatment. The best water contact angle contrast obtained from the treated surfaces was larger than 100 degrees.
Design an Auto-Recharging System for Mobile Robots
Authors: Su K.L. , Guo J.H. , Hung C.W. , Song Y.C.
Published: July 2012

The article develops an auto-charging system for mobile robots, and programs a new docking processing to enhance successful rate. The system contains a docking station and a mobile robot. The docking station contains a docking structure, a limit switch, a charger, two power detection modules and two wireless RF modules. The mobile robot contains a power detection module (voltage and current), an auto-switch, a wireless RF module, a charging connection structure and a laser range finder. The docking structure is designed with one active degree of freedom and two passive degrees of freedom. The power detection module is controlled by HOLTEK microchip. We calculate the power values using the redundant management method and statistical signal prediction method, and develop an auto-recharging processing using multiple sensors and laser range finder for mobile robots. The processing can enhances the successful rate to guide the mobile robot moving to the docking station. In the experimental results, the power of the mobile robot is under the threshold value. The mobile robot transmits the charging command to the docking station via wireless RF interface, and searches the landmark of the docking station using laser range finder (SICK). The laser range finder guides the mobile robot approach to the docking station. The mobile robot touches the docking station to trig the power detection device. The docking station supplies the power to the mobile robot by charger, and detects the current and voltage values of the charging processing. The charging current of the docking station is under the threshold value. The docking station turns off the charging current, and trigs the mobile robot leaving the docking station via wireless RF interface.
Image Recognition Method Applying in Formation Control of Mobile Robots
Authors: Lin Y.C. , Chen C.H. , Su K.L. , Guo J.H.
Published: July 2012

The article develops multi-pattern formation exchange using A* searching algorithm, and programs the shortest motion paths for mobile robots. The system contains an image recognition system, a motion platform, some wireless RF modules and five mobile robots. We use Otsu algorithm to recognize the variety 2D bar code to classify variety pattern, and control five mobile robots to execute formation exchange, and present the movement scenario on the motion platform. We have been developed some pattern formations according to game applications, such as hook pattern formation, T pattern formation, L pattern formation, rectangle pattern formation, sward pattern formation and so on, and develop the user interface of the multi-robot system to program motion paths for variety pattern formation exchange on the supervised computer. The supervised computer programs pattern formation exchange according to the image recognition results, and controls mobile robots moving on the motion platform via wireless RF interface. In the experimental results, mobile robots can receive the pattern formation command from the supervised computer, and change the original pattern formation to the assigned pattern formation on the motion platform, and avoid other mobile robots on real-time.
On Vision-Based Orientation Detection Analysis of Industrial Object with Circular-Shape Features
Authors: Niu Feng Lian , Yi Xin Hua
Published: July 2012

For the need of accuracy orientation location about work piece with circle features in vision-based automatic assemble industry, a kind of orientation detection method about work piece based on monocular vision was presented to locate the work piece and then adjust the orientation of assembly parts to guarantee the assembly precision. Ellipse parameters and center point of contours about holes was solved by extracting the center and edge about given the work piece with four holes in the experiment, orientation and location about surface of work piece can be derived. And then Automatic assemble was implemented by orientation of work piece feeding back to robot manipulator to adjust the orientation of assembling part. Experiment analysis has demonstrated that the uncertain of position is less than 8 um and the uncertain of orientation is less than 5 degree.
PID Control of an Electric Clutch Actuator
Authors: Wang Bin , Yue Han Qi , Han Qi , Gao Bing Zhao
Published: July 2012

A PID controller is designed for an electric clutch actuator, which adopts ball screw as the speed reduction mechanism. Ball screw has high transmission efficiency. However, it does not self-lock. Moreover, the nonlinear friction force, load force, and the nonlinear characteristics of the motor drive circuit increase the difficulty of the position control of the actuator. Model-based control development is used, and the PID coefficients are calibrated based on a simulation model. Then the tuned parameters are used for experimental test. Through experimental results, it is shown that the designed PID controller provides satisfied position tracking performance of the electric clutch actuator.
Study on the Trajectory Planning of Hybrid-Driven Planar 3-RRR Mechanism
Authors: Song Sheng Tao , Li Rui Qin , Wang Ai Ling , Gao Yan
Published: July 2012

Hybrid-driven mechanism synthesis the constant speed motor and the servo motor as the power source through a multi degree of freedom mechanism. The text study on the trajectory planning of hybrid-driven planar 3-RRR mechanism. Firstly, based on compatible link combinations, all possible basic configurations of planar 3-dof kinematics chains were derived. Based on the requirements of hybrid-driven mode, the kinematics chains were selected one by one Planar 3-RRR mechanism was determined to be the research object finally. Then, based on the conclusions of inverse kinematics analysis, using the cubic spline function on point to point path planning, the servo motor rotation laws were presented. Comparing the different speed situation of constant motor, the influence trends on planning results were analyzed.
The Design and Implement of a Receiver for FSK Signal
Authors: Liu Xiao Peng , Han Yan , Zhong Dong Dong , Wang Ming Yu
Published: July 2012

A novel frequency shift keying (FSK) receiver is presented, including receiving antennas, a low noise amplifier (LNA), band-pass filters (BPF) and a novel all-digital 2-level FSK demodulator. The Matlab simulation results of the all-digital FSK demodulator show that it can improve bit error ratio (BER) performance compared with pseudo-coherent FSK demodulation (PCFSK). The novel FSK demodulator defined using Verilog HDL is easy to be implemented on Field Programmable Gate Array (FPGA) and in CMOS integrated circuit. The whole FSK receiver designed and implemented on a PCB board can receive FSK signal and send the recovered data to computer through RS-232 interface.
Attitude Matching for Gimbaled Inertial Navigation System Transfer Alignment
Authors: Ding Zhi Jian , Cai Hong , Yang Hua Bo , Cao Yuan
Published: July 2012

Abstract: Aiming at transfer alignment of gimbaled INS(Inertial Navigation Systems) on moving base, the paper proposes an attitude matching alignment model to calibrate the slave platform. This method is achieved by applying a Kalman filter, which based on the frame angle error equations, to estimate the fixed misalignment angle and obtain the misalignment angle. Firstly, the frame dynamics equations are introduced and the relation between the fixed angle and misalignment angle is discussed. Secondly, the frame angular error differential equations are built up via the frame angle information from the master and the slave INS platform. Lastly, the attitude matching alignment model is designed based on Kalman filter technology. The simulation results show that the proposed method can obtain an alignment accuracy of 40", and the corresponding alignment time is 30 seconds.
A Single CCD Algorithm to Determine the Position and Attitude during Rolling Phase of Rendezvous and Docking
Authors: Zheng Li Li , Jiang Yu Xian
Published: July 2012

Propose a new algorithm that use Euler angles to calculate directly large relative position and attitude of rendezvous and docking. By analyzing the feasibility of using Euler angles to solve instead of using quaternion and deriving the relations between the coordinates of the identification-points and the coordinates of point-images, a group of non-linear equations including relative position and attitude is established. It is proved that three non-collinear points are sufficient and required to determine the position and attitude uniquely. The whole deriving process does not mention any assumption and simplification in theory. Simulations indicate that the algorithm is high-accurate, unique-solution and wide application scope.
The Development Status of Underwater Positioning and Navigation Technology Used on Deep Tow System
Authors: Shan Rui , Zhao Tie Hu , Zeng Chao
Published: July 2012

The methods of the geophysical navigation and acoustic navigation are outlined in this paper. And this paper focuses on the applications of acoustic positioning used on deep tow system. The advantages and disadvantages of three traditional acoustic positioning systems, especially for USBL system, are respectively summarized. Some typical products are listed to illuminate the performance and application of acoustic navigation system. And this paper pointed out the key technical problems to be solved and its development of underwater navigation. Combined acoustic navigation and integrated navigation will become a research hotspot.
A Bearing Fault Diagnosis Using Wavelet Envelope Spectrum Based on Full Vector Spectrum Technology
Authors: Gong Xiao Yun , Han Jie , Chen Hong , Lei Wen Ping
Published: July 2012

Wavelet envelope demodulation method can distinguish the fault information from complex bearing vibration signal. However, traditional signal analysis method, which is solely based on a single source data, is imperfect. In this paper, an approach to wavelet packet and envelope analysis based on full vector spectrum technology was proposed. Firstly, two different data from the same source were respectively decomposed and recomposed by wavelet packet transform. Then, in order to improve the accuracy of detecting fault, the recomposed signals were merged by using the full vector spectrum method. Compared to the traditional signal analysis method, the advantage of the new method is presented by showing their application to bearings. Finally, results from the bearing vibration signal analysis show that the new approach is more effective because of its inheritance and all-sided feature.
A Nonlinear Control Method of Steering Angle Following Used in Steer-by-Wire System
Authors: Li Yi Ran , Huang Jian Ming , He Zhi Ming
Published: July 2012

In this paper, active disturbance rejection control method is used to implement the steering angle following control of steer-by-wire system for the simplification of controller designing. The dynamic model of steering performing system is established, and then a second order active disturbance rejection controller is designed to control the steering angle. On the electric vehicle with steer-by-wire system, the angle following test of steering performing system is carried out under the control of the second order active disturbance rejection controller. The results show that the designed active disturbance rejection controller can restrain the effect of system resistant force on the accuracy of angle following and meet the requirement of steer-by-wire system to the steering angle following function. At the same time, there isn’t necessary to get the accurate data of steering system and the design process of controller becomes simple with adopting active disturbance rejection control method.
A Novel Approach in Doppler Measurement Processing
Authors: Dong Kai , Guan Xin , Cui Ya Qi , He You
Published: July 2012

In order to solve the problem of algorithmic complexity and large computation in Doppler radar measurement processing, a direct unscented Kalman filter is proposed in the paper. It undertakes nonlinear filtering to Doppler radar measurement in mixed coordinate directly, which makes the algorithm much simpler and reduces computation greatly. Simulation results show that the algorithm not only reaches the similar state estimation accuracy like SEKF and SUKF, but also improves the consistency of state estimation apparently.
Based on Estimation of the Ionospheric Characteristics HF Frequency Prediction Method
Authors: Li Chao , Liu Yun Jiang , Zhang Heng Yang , Yang Xiao Peng , Wang Feng
Published: July 2012

To grasp Complex characteristics of shortwave (HF) channel is the key and difficulty to research HF communication. On the premise of comprehending the ionosphere prediction method in the Asia Oceania region, HF frequency prediction method recommended by the International Telecommunication Union (ITU) is improved in this paper, and the engineering calculation method of predicting HF frequency in the Asia Oceania region is concluded and summarized. Comparing with the ITS (the Institute for Telecommunication Science) software’s predicting result, the method is improved to some extent in time availability and SNR in the receiving point.
Category Level Object Discovery Using Dynamic Topic Model
Authors: Guo Jun , Sun Hao , Zhu Chang Ren
Published: July 2012

Category level object discovery is important for a number of applications such as remote sensing image classification, and data mining in images and video sequences. This paper presents a novel unsupervised learning algorithm for discovering object category and their locations in video sequences. Both appearance consistency and motion consistency of local patches across frames are exploited. Video patches are first extracted and represented by spatial-temporal context words. A dynamic topic model is then introduced to learn object categories in video sequences. The proposed dynamic model can categorize and localize multiple objects in a single video. Experimental results on the CamVid dataset and the VISATTM dataset demonstrate the effectiveness of our method.
Distributed Temperature Sensor Network System
Authors: Wang Hong Wei , Zhang Chun Lei , Ni Xiao Ming , Gao Zhi Gang , Zhang Wen Kai , Wang Xiao Ni , Hao Zhi Tian , Wang Ming Hui
Published: July 2012

The wireless sensor network (WSN) is the development trend of the technology of sensor. This paper, based on the nRF905 wireless module, introduces a wireless temperature gathering and transmitting system. From RF modules and master control module, the hardware platform has been designed, beyond that, the paper introduces the temperature sensor network software design. The test show that the system is stable, and datas are reliable.
Identification of Dynamic Model for Ultra-Precision Positioning System
Authors: Chen Hui , Zhou Xing Peng , Tan Yong Hong , Li Ru Qiong , Zhang Ya Hong , Dong Rui Li
Published: July 2012

Abstract: In order to improve the control precision of the piezoceramic actuator in precision position system, a dynamic modeling of Ultra-precision Positioning System is proposed. A two-step identification strategy is adopted in this paper. Step 1: The linear model was identified based on step input response by least square method. Step 2: According to the step.1 result, the designed nonlinear observer was applied to estimate the output of hysteresis by Fast Tracking Differentiator. The polynomials are used consistently approximate continuous functions of f(.) and g(.) in the Duhem modeling based on the theorem of the Weierstrass polynomial approximation theory. Recursive least square methods are developed to identify α and the coefficients of the polynomials in Duhem model. At last , the simulation results show applicability, rapid convergence velocity and high calculation accuracy of the algorithm.
Feature Extraction of Rolling Bearing Fault Diagnosis
Authors: Sun Li Jie , Zhang Li , Yang Yong Bo , Zhang Da Bo , Wu Li Chun
Published: July 2012

Mechanical equipment fault diagnosis occupies an important position in the industrial production, and feature extraction plays an important role in fault diagnosis. This paper analyzes various methods of feature extraction in rolling bearing fault diagnosis and classifies them into two big categories, which are methods of depending on empirical rules and experimental trials and using objective methods for screening. The former includes five methods: frequency as the characteristic parameters, multi-sensor information fusion method, rough set attribute reduction method, "zoom" method and vibration signal as the characteristic parameters. The latter includes two methods: sensitivity extraction and data mining methods to select attributes. Currently, selection methods of feature parameters depend heavily on empirical rules and experimental trials, thus extraction results are be subjected to restriction from subjective level, feature extraction in the future will develop toward objective screening direction.
Design of a New Suspension System Controlled by Fuzzy-PID with Wheelbase Preview
Authors: Wong Pak Kin , Huang Shao Jia , Xu Tao , Wong Hang Cheong , Xie Zheng Chao
Published: July 2012

This paper studies a new active vehicle suspension controlled by Fuzzy-PID controller with wheel base preview. By this new algorithm, the fuzzy controller controls the parameters of the PID in time .Then the wheelbase preview is integrated to ensure the future road information is combined with the current state of the vehicle effectively. A sensor is placed on the front suspension collects and feeds forward the preview information as an input to the rear suspension system . MATLAB simulations show that using such control strategy can obtain a low noise and better robustness performance than the traditional PID control algorithm.