bluuebunny/crossref_metadata_2025 huggingface dataset:
Analysis of Energy Efficiency of Solar Energy/Air Source Compound Heat Pump System under Heating Condition
Authors: Hou Bo Bo , Zhang Zhi Gang , Zhang Wei
Published: October 2011

Based on the test data analysis and processing which are acquired from a solar energy/air source compound heat pump system in the actual building, the seasonal energy efficiency ratio under the two modes and the energy-saving rate are obtained. Through the analysis of the energy-saving rate, the energy-saving characteristics of the solar energy/air source compound heat pump system under heating condition is discussed in detailed.
The Impact of Balance Hole Radial Position of Centrifugal Pump on Axial Force and External Characteristics
Authors: Zhao Jin Jing , Mu Jie Gang , Zheng Shui Hua , Lu He Quan , Wang Hui
Published: October 2011

In this paper, the method of balancing the axial force with balance hole is studied based on the combination of CFD and experimental research. The relationship between the radial position of balance hole and the effect of axial force and external characteristics of the pump is in-depth studied. Research shows that, there are certain laws for the effect of the balance hole location to the axial force and the external characteristics: the overall pressure of the balance chamber and the axial force decrease with the decrescence of the balance hole radial location, which could get good effect on balancing axial force. But the head and efficiency decreased.
A New Design for Liquid Mixing System
Authors: Tong Ying Xin
Published: October 2011

The thesis introduces a new design for liquid mixing system, which can replace the liquid mixing system based on the PLC or numerous meters. The fact proves the new design have lower cost, smaller volume, higher control accuracy and quick response.
Numerical Simulation on Flow Structure of a Steam-Jet Pump Influenced by Primary Nozzle Geometries
Authors: Dai Xiao Chun , Huo Jian
Published: October 2011

The aim of the paper is to reveal the flow structure and the mixing process of a steam-jet pump by using a computational fluid dynamics code FLUENT. Discusses the effect on a steam-jet pump’s entrainment ratio when the throat diameter of the primary nozzle as well as the outlet diameter of the primary nozzle is varied. Analyzes the position of shock wave which will bring the steam-jet pump’s performance a great loss. The performances of a steam-jet pump are studied by changing back pressures while the distance between primary nozzle outlet and mixing chamber inlet (DPM) is varied. The entrainment ratios of a steam-jet pump with different values of DPM and different back pressures are calculated.
Recycling Experimental Research of Thermosetting Phenolic Plastic Waste Based on Mechanical Effects
Authors: Wu Zhong Wei , Liu Zhi Feng , Zhao Jian
Published: October 2011

Using adjustable speed crushing regeneration test device for the recovery experiment of thermosetting phenolic plastic waste, this paper analyses the principle of recovery process. Through particle size analytical technique, FTIR, XRD and SEM etc. various testing method is analyzed mechanochemical effects of crushing process. Research the speed, time, temperature process parameters of the influence of recycling process conditions. According to the experimental results, it established the mechanochemical model and analyzed the degradation and regeneration mechanism of thermosetting phenolic plastic waste.
An Experimental and Computational Study of Interaction between Water Mist and Gas Jet Flame
Authors: Huang Xian Jia , Wang Xi Shi , Lu Jia , Ding Zhong Jun , Liao Guan Xuan
Published: October 2011

The experiment on gas jet flame extinguishing with water mist in open space was conducted in this paper. On the basis of experimental result, the process of the flame extinguishment can be classified into two categories:1) when fuel flow rate is small, the gas jet flame can be suppressed and extinguished quickly; 2) When fuel flow is large, the flame lifts from the attached position at the burner exit after suppressed by the water mist. FLUENT is used to simulate the interaction of water mist with gas jet flame. The Eddy-dissipation model (EDM) is used for combustion of flame. the water mist is simulated by Discrete Phase Model (DPM).The simulated results agree well with the experimental results. To some extent, EDM is suitable for simulating the interaction of water mist with a turbulent gas jet flame.
Research on Influencing Factors of Methane/Air Combustion in the Ring Porous Medium Burner
Authors: Xu Jiang Rong , Zhao Jian Ming , Xu Shan Shan , Wang Guan Qing
Published: October 2011

In this paper, we focuses on combustion characteristics of the mixed gas of methane/air in the ring porous medium burner using numerical simulating method. The influencing factors of combustion, such as different methane/air ratio, the velocity of flow and heat loss of internal and external wall, are discussed, and it is shown that the ring porous medium burners have some advantages different from straight or rectangular porous media burners. Due to annular asymmetric structure, the temperature distribution of ring porous media burners are more uniform, and are no unfavorable phenomena such as the local high temperature and the hot spots. The simulation results for annular porous medium provides important theoretical basis for the development of new porous medium burners.
Hoop Membrane Stress Analysis of Elbow-Pipe under Single Internal Pressure
Authors: Li Xiao Hong
Published: October 2011

In the article, a kind of regional force balance method based on plates and shells theories of elastic mechanics are applied to study the hoop membrane stress of the elbow-pipe, while internal pressure is as a single load. By learning the static balance equation ΣFx=0 of a micro-region segment of pipe shell, it is found that axial membrane stress σ1 is perpendicular to x-direction and has no effect to equilibrium condition, here axial stress σ1is discussed explicitly. It shows that, the hoop membrane stress σh of the elbow is the times of straight tube’s hoop stress.
Application of VE in the Products Function Innovation
Authors: He Xue Mei , Ji Xiao Min
Published: October 2011

This paper mainly studied the application of VE in the products function innovation, stated and analyzed several aspects ,such as the importance of function degree, the functional properties, whether the proper quantity function and the necessity of function in the products function innovation. And based on it the author deeply analyzed the relationship of function - cost - value in product designing process, so as to provide theoretical basis and guidance for current enterprise in developing the new products.
The Design of Computer Control System for Grinding-Classification Process
Authors: Yu Zhong An , Tan Wei Qin , Xie Zheng Hua
Published: October 2011

Grinding-classification procedure is the key link of dressing production. This paper briefly introduced the technology of grinding and classification, and designed the computer control system of grinding and classification process, the realization of the grinder concentration control is by variable ratio control and the control of pump pool level is realized by average control, which realized automatic control for the concentration and flow of the grinding and classification, and presented the design of hardware and software for the control system.
Analysis and Finite Element Method Simulation of Rear Sub-Frame Hydroforming Process
Authors: Qu Zhou De
Published: October 2011

The recent application of tube hydroforming in the automotive industry demands finite element analysis, since it is rapidly being used as an effective tool for the evaluation of the design of hydroforming processes. In this paper the formability of rear sub-frame in car body with tube hydroforming is studied. The comparison of various feeding and pressure on the hydroforming process is evaluated utilizing Finite Element Method to obtain detailed information on the deformation behaviors in hydroforming of rear sub-frame. It has been shown that optical leading paths such as axial feeding and internal pressure can quantify the circumferential thickness distribution in the rear sub-frame tube periphery.
Parameter Optimization of PID Controller Based on an Improved Particle Swarm Optimization for the Induction Motor
Authors: Shi Xia Bo , Lin Wei Xing
Published: October 2011

This paper presents a new approach of PID parameter optimization for the induction motor speed system by using an improved particle swarm optimization (IPSO). The induction motor speed is changed by the stator voltage controlled with PID controller. The performance of PID controller based on IPSO is compared to Linearly Decreasing Inertia Weight (LIWPSO). Simulation results demonstrate that the IPSO algorithm has better dynamic performance, higher accuracy and faster convergence and good performance for the PID controller.
Modeling Method for Complex Structure System in Finite Element Simulating Analysis
Authors: Zhang Xue Ling , Hu Ya Hui , Chai Shu Feng
Published: October 2011

How to deal with the model is important in analyzing structure system with finite element method, because the rationality of model has direct relationship with veracity of simulation result. In this paper some simplify modeling methods are expatiated. And an approach is supposed that combine simplifying complex model and rigid-treating sub-component which make model more close to reality. In final, an instance of multi-type-element system structure is computed to prove the correctness of the method.
Modeling and Variable Structure Control of Autonomous Underwater Vehicles with Moving Mass
Authors: Zhao E , Song Bao Wei
Published: October 2011

In order to solve the problem of general fins and rudders being lower at low moving speed, the moving mass technical is applied onto AUV, thus to radically solve the weakness of control method with fin and rudder. The space dynamics model of moving mass control is created for AUV. And based on this, the moving mass control system is designed with the sliding mode variable structure control method so as to ensure system tracking error zero convergence. By controlling the moving mass movement with moving mass control system, the attitude of AVU is previously controlled. And simulation result proves that moving mass control system will control the AUV attitude angle precisely and rapidly.
Circulation Distribution of High Specific Speed Mixed-Flow Pump
Authors: Wang Chun Lin , Li Chang Jun , Ding Jian , Liu Dong
Published: October 2011

The load distribution of the impeller and the shape of blade bone surface as well as the pump performance are determined by the circulation distribution from the impeller inlet to the outlet. However, perfect conclusions about optimal forms of the circulation distribution have not been seen yet. In this paper, three kinds of circulation distributions were studied. Three mixed flow pump impellers with high specific speed were designed according to the circulation distributions, and the models of the three pumps were built and modeled in the commercial CFD code ANSYS-CFX 11.0. The flow field in the pumps has been investigated using large eddy simulation (LES). Experiment was carried out on one model. And the performance curves predicted by LES were compared with the experimental data, and good agreements were achieved. The results show that: there is a low pressure area at impeller outlet. The pressure distribution along the circumferential direction was asymmetry at the front-end area of guide vanes, but it becomes uniform at the end of guide vane. The bearing pressure on the pressure side of the model 2 is lower, and the pressure distribution of model 1 is more asymmetry and there is a clear low pressure area at outlet of blade; Cavitation performance of model 2 is better, and the maximum efficiency is also the highest, but the hump is more serious; Model 1 has a widest area of high effective area.
Broadband Transition between Substrate Integrated Waveguide (SIW) and Rectangular Waveguide for Millimeter-Wave Applications
Authors: Wang Kuang Da , Hong Wei , Wu Ke
Published: October 2011

In this paper, a broadband and simple vertical transition between substrate integrated waveguide and standard air-filled rectangular waveguide is design and experimentally verified. From full-wave simulation of the structure, a relative bandwidth of 19.5% in W-band with return loss better than 20dB is reached. Then, five copies of back-to-back connected transitions are fabricated on RT/Duroid 5880 substrate. The experimental results show that the transition pairs have an average of 15% relative bandwidth with return loss better than 12dB and insert loss lower than 1.2dB. To explain the differences between simulated and tested results, an error analysis is presented.
Test System for DT-100 Short-Wave Radio’s Power Amplifier Based on LabVIEW
Authors: Cui Li Yan , Zhang Xiao Qin , Gong Shu Qiu
Published: October 2011

In order to modify present simulation and test system of DT-100 Short-wave Radio’s Power Amplifier, a kind of automatic test system for short wave radio’s power amplifier is designed here in which virtual instruments and MCU technology are used. Compared with the earlier systems, the new test system avoids many weaknesses, such as complicated simulation test, tedious testing process, and huge manual calculations and has merits of simple operation and accurate assessment all of which provide a better way for existing testing system.
Nondestructive Testing of Bridge Cables Using Magnetostrictive Guided Wave Technique
Authors: Xu Jiang , Wu Xin Jun
Published: October 2011

Cables are used as critical structure components for suspended and cable-stayed bridges. It has been recently increased the need for inspection methods to assess the conditions of the cables due to owners concern about the operability and safety of such aging structures. An alternative technique is being developed in this paper. The magnetostrictive guided wave technology is used to test broken wires. The suitability of this method is studied through application tests on experimental setups, lab-made cables with simulated broken wires and field test. Test Results indicate that this technique can detect two broken wires away exceeding two meters and propagating over one hundred meters. It is a promising method for nondestructive testing of bridge cables.
A Sound Sources Locating Method of Constrained Least Squares Based on Time Delay Estimation
Authors: Su Shu Jing , Zhang Hai Li
Published: October 2011

The sound sources positioning method based on time delay estimation is through the iteration of a group of nonlinear equation to solve the target position. Most of the existing methods is to solve under the hypothesis that the sound spread velocity in air is known. This paper puts forward several effective methods of source orientation and propagation velocity estimation. These methods are only using the time delay which comes from the received signal between sensors separated in space to deduce the solving method of sound source location and sound’s speed estimation based on least squares, total least squares, limited data not sure and constraint least squares method, and then compare the characteristics of these methods through the computer simulation.
Carrier Phase Method for Indoor Pseudolite Positioning System
Authors: Wan Xiao Guang , Zhan Xing Qun , Du Guang
Published: October 2011

In many pseudolite systems which recently have been proposed and tested for indoor navigation, the method of ambiguity resolution was static initialization. Using pseudolites for static initialization, the equations are correlated with each other at observation epochs and the ambiguities can’t be calculated from the equations. The initial position of rover needed to be known in this method. In this paper, an ambiguity resolution on the fly method is proposed. The method uses kinematic initialization for ambiguity resolution instead of the assuming the initial rover position is known. To demonstrate the validity of the method, simulation results based on realistic indoor positioning environments are also studied.
Triangle Rectangle Method for 2D Irregular Cutting-Stock Problems
Authors: Zheng Wu , Li Bing , Yang Kuo Ran , Li Hang
Published: October 2011

The goal of 2D irregular cutting-stock problems is to make the remaining materials reduce to a minimum in the cutting process, making the maximum utilization of raw materials. This paper proposed “Triangle rectangle method”. First, turn the irregular shapes of parts into the smallest triangle or quadrilateral, if it is a quadrilateral, turn the quadrilateral to the smallest triangle and turn the triangle to the smallest right triangle, then make the two same smallest right triangles coincide as a rectangular along the longest side of the envelope .At last, follow Rectangular envelope method, to find the best way of cutting. This method makes the utilization of raw materials greatly improved and increases the profits of the enterprise, thus improves the competitiveness of enterprises, having very important practical significance.
Inspection of Fabric Defects Based on Compactly Supported Biorthogonal Wavelet Transform
Authors: Chen Shu Yue , Xu Ming Qian
Published: October 2011

A method to inspect fabric defects based on compactly supported biorthogonal wavelet transform is presented. Firstly, the fabric images are captured by CCD camera. Then fabric defects are detected by means of the strategy of compactly supported biorthogonal wavelet transform. The phase shifts with the orthogonal and the biorthogonal wavelet techniques are compared aiming at the warp-lacking. It is shown that the phase shifts of orthogonal wavelet behave as different degrees, the ones of biorthogonal wavelet are zero. Finally, employing the biorthogonal wavelet method to inspect fabric defects, including warp-lacking, weft-lacking, oil stains, and holes, is given by experiments, in which the results are satisfied.
Modeling and Analyzing of Short-Range Air Defense Operation Based on Petri Net
Authors: Zhou Zhe Shuai , Fang Hong Bing
Published: October 2011

According to analyze the characteristic of the operational progress of short-range air defense, Petri net (PN) is applied to describe the operational progress, which includes the radar reconnaissance, the operational plans decision-making, and the operational effectiveness evaluation. Based on study of the component model of short-range air defense, the corresponding PN model is established, and the time delay is also analyzed. The results indicate that PN is an effective tool for establishing dynamic system simulation model of complex discrete event.
Relationship between the Least Mesh Numbers of Models and Distance of Viewpoint in Efficient Real-Time Rendering
Authors: Yang Li Hua , Sun Xiao Dong , Zhang Hong Bin
Published: October 2011

LOD (detail of level) technology is crucial technologies in virtual reality system, it’s more important especially in web based 3D model rendering. For the LOD technology reduces the complexity of computation which makes the possibility of real time rendering. This paper will discuss the minimum optimal mesh numbers which a model should be under different distance of viewpoint.
Measurement on the Dielectric Constant of Grass with Rectangular Waveguide at C Band
Authors: Xian Chun Lin , Chen Yan , Tong Ling , Jia Ming Quan
Published: October 2011

This paper was developed by microwave measurement on the vegetation dielectric constant through using the rectangular-waveguide at C Band. The measurement system and the method of the measurement will be introduced in detail. We have a standard block of known dielectric constant measurement, and then evaluate the error range. The system of measurement error range is ± 5%.At last, the result of this experiment showed that different density corresponds to different dielectric constant in the case of certain moisture content, and the dielectric constant increases with the density.
Designing and Kinematics Analysis on Running Mechanism of Biped Robot for Water-Running
Authors: Xu Lin Sen , Zhao Jiang Hai , Li Bing , Xu Feng
Published: October 2011

A mechanism based on a Grashof crank-link mechanism and a hybrid-drive six-linkage mechanism is designed to fit its ankle and sole trajectories and imitate the function of the basilisk lizard running on water. The linkage mechanism kinematics theory and the geometric identity condition are used to analyze the mechanism kinematics, and an instance simulation is carried out to prove that the mechanism can satisfy the kinematics requirements of water-running.
Research on Coordination of Evacuation of Human and Car Simulation Optimization Method
Authors: Ma Yun Long , Wang Jian
Published: October 2011

Among researches on people evacuation under emergency, there are no deep touch of coordinating evacuation strategy of human and traffic, and also can not set models and simulate the whole process of evacuation. This research focused on the human evacuation under emergencies, divided the situations into Not Intervene and May Intervene, analyzed the coordination system and probed the model of coordinating evacuation. Based on the result of crowd simulation, the author could forecast the result of human evacuation and find the optimal traffic schedule proposal. The author took use of the improved Genetic Algorithm as well as the distributed coordinating simulation, finally found a systematic optimal scheduling program and revealed the internal regular pattern of coordinating evacuation.
The Experiment of Development on Practical Electricity-Saving Socket
Authors: Yuan Shuo , Zhao Lin Zhe , Wang Yue , Tong Zheng Rong
Published: October 2011

A multifunctional electricity-saving socket was developed based on low power microcontroller STC5608AD as information processing core. This kind of practical electricity-saving socket has advantages of protection of exorbitant voltage and current, automatic sleep, remote control switch and such intelligent functions. This device can be used to reduce stand-by power consumption of televisions, computers, air-conditions and so on.
Research on Machining Ellipse Gyre Surface with the Ball-End Cutter
Authors: Wang Hong Jiu , Wang Zhen Zhen
Published: October 2011

Ellipse gyre surface has wide application due to its special optical property. High-precision manufacturing is more and more important. Here we performed an analysis to decreasing reduction of batch production cost. Firstly, the scheme of manufacturing of 2-axis NC machining is given. Secondly, a basis for calculation of row space with the ball-end cutter is provided. Lastly, the formula of the level and the axis feed is also provided. The feasibility and reliability of these models are proved with examples.
Measurement and Research of Oscillating State of Hydraulic Oscillation in Slab Continuous Casting
Authors: Ma Yong , Wu Yu Cheng , Chen Wen Lin , Wang Xin Fang , Zhao Ya Pei
Published: October 2011

The stability of mold oscillation can directly influence on slab surface quality and operational safety in continuous casting. In recent years, the hydraulic oscillation is developed and applied as the driven equipment of mold oscillation. In the present work, based on the slab continuous caster of hydraulic oscillations, the displacement and other parameters of hydraulic oscillator are measured and the evaluation method of oscillation is studied. The displacement difference and phase difference of oscillation with sinusoidal waveform and non-sinusoidal waveform are analyzed. Especially, the dynamic characteristics of the driving force of left and right cylinders are evaluated. The results indicated that the hydraulic oscillator is quite a good device in terms of precision. The method proposed may be useful for evaluating oscillators.
Workload Performance Characterization and Test Strategy of High-Performance Fault-Tolerant Computers Based on BIBbench
Authors: Li Bo , Zhou Hai Ying , Zuo De Cheng
Published: October 2011

It is critical to understand the workload characteristics and resource usage patterns of available applications to guide the design and development of architecture of the future large scale servers. In this paper, we analyze the workload performance characteristics of the actual Bank Intermediary Business (BIB) characteristics with BIBmodel and BIBbench design work, and propose BIB performance workload and use case definitions. The analysis and comparisons of workload and use case illustrate that the workload performance characteristics of BIB is totally different with TPC benchmarks. With the development of economy and technology, the requirements for BIB servers are important in modeling, benchmarks developing and workload performance characteristics studying are increased nowadays.
Modeling and Embedded Autonomous Control for Quad-Rotor MAV
Authors: Wang Wei , Wang Feng , Zhou Yong , Cheng Yong , Song Yu Ze , Nonami Kenzo
Published: October 2011

This paper presents outdoor fully autonomous control for a Quad-Rotor MAV (Micro Air Vehicle). In case of natural disaster like earthquake, a MAV will be very effective for surveying the site and environment in dangerous area or narrow space, where human cannot access safely. In addition, it will be helpful to prevent secondary disaster. Our Autonomous Rotary-wing MAV is a quad-rotor type MAV which total mass is 660g and is capable of 10 minute outdoor flights. In order to measure the relative position of the MAV, we have installed a sensor-board which includes GPS, gyro, and acceleration sensors on our MAV. So it can achieve fully autonomous flight control with the complete embedded system. We also have installed a wireless camera to our MAV so it can transmit image data to the ground station. This paper describes model based autonomous hovering control, guidance control performance of our quad-rotor MAV.
Research on ROI Image Processing Technology of Teleoperation Construction Robot Based on Trinocular Stereo Vision
Authors: Gong Ming De , Tian Bo , Ning Yue , Li Wei Wei
Published: October 2011

Digital image has a large quantity of image data and long time for transmitting. It affects the real-time of the teleoperation robot system. According to the basic principle of human eye identifying objects and image blurry processing, a new image processing method of simulating human eye range of interest (ROI) is proposed. The method uses the calibration algorithm of three-dimensional stereo target and the Gauss blurred principle. The non-ROI region is blurred to hierarchy for extracting the feature and measurement to finish the image processing tasks. The experimental results showed that the quality of the images was assured and the transmission time was shorted. The real-time of the teleoperation robot system was also guaranteed.
Application of CAN Bus in Automobile Power Window Control System
Authors: Wang Yi , Wu Jian
Published: October 2011

Aimed at the demand of reducing the wiring harness and declining cost in the automobile control system, electrical controlling system of automobile power window is designed with PIC18F258 single chip computer of integrated CAN bus as the core. Hardware structure and flow chart of software are presented. Through the processing of sample current, it can be judged whether the automobile window meets a barrier, thus realizing the anti-pinch function of window. Compared to the point-to-point control, the bus control not only reduces the wiring harness and cost, but also makes the control more flexible and fast. The experiment results show this system can operate normally, the advantage of this system are reliable performance, low cost, low power consumption and easy to maintain.
Modeling of Rope Longitudinal Vibration on Flexible Hoisting System with Time-Varying Length
Authors: Bao Ji Hu , Zhang Peng , Zhu Chang Ming
Published: October 2011

Aimed at the longitudinal vibration of rope hoisting system with time-varying length, the governing equations are developed employing the Hamilton’s principle considering mutual influence of the rigid motion and deformation of rope. The Galerkin’s method is used to discretize the governing equations. In the mean time, The motions of elevator hoisting system were illustrated to evaluate the proposed mathematical models. The results of simulation show that the modeling methods can represent the longitudinal vibration of rope hoisting system with time-varying length in the paper. The governing equations derived can provide guidelines for further study on flexible hoisting system.
Improvement of Dynamic Stability in Multi-Machine Power System with TCSC Installed in Tie-Line
Authors: Wu Yan Juan , Li Lin Chuan
Published: October 2011

Considering that the capacitance value of thyristor controlled series capacitor (TCSC) can be adjusted quickly in capacitive mode, and that accumulated energy can be released in bypass mode. A control strategy is presented for improvement of dynamic stability in multi-machine power system. TCSC inputs maximum capacitive compensation in a appropriate time when equivalent generator of multi-machine power system accelerates relative to center of inertia (COI) after a fault, yet TCSC operates in bypass temporarily mode for deceleration. TCSC adopts conventional dynamic control during other time. By IEEE4 machine 10 nodes system simulation experiment, the effectiveness of the controller is verified.
Holographic Spectrum in the Remote Rotating Machinery Fault Diagnosis
Authors: Tang Wu Chu , Shi Zhi Hui , Kang Da Li
Published: October 2011

In this paper, a remote real-time online rotating machinery monitoring system, which was developed and tested in the Industrial application, is presented including its remote monitoring sub-system, fault diagnosis sub-system. First, the system architecture is introduced. Next, a web-based remote monitoring system is designed, which allows researches and engineers to remotely monitor the health of the machine from any remote geographic location through the Internet. Finally, the holographic spectrum technology in this system is discussed as well for the purpose of providing accurate and reliable diagnosis of the machine states and accident prevention.
The Design and Implementation of a BLDC Motor Drive with DTC
Authors: Ho Tze Yee , Chen Li Yuan , Yang Lung Hsian , Lin Wei Lun
Published: October 2011

This paper presents a brushless DC (BLDC) motor drive with direct torque control (DTC).The detailed hardware and software design are analyzed and designed. The performance of the BLDC employing DTC is compared with that of BLDC utilizing PWM current control. A prototype of BLDC motor drive based on the DSP controller with DTC control is implemented and validated by the exhibition of waveforms measurement for currents, torque, flux linkage, and speed. The experimental results not only verify the feasibility of designed system but also demonstrate that BLDC with DTC control has superior characteristics than that with PWM current control.
An Investigation on Size Distribution of Exhaust Particulate Emitted from Gasoline Engine
Authors: Pei Yi Qiang , Li Tong , Pan Suo Zhu
Published: October 2011

This study is carried out to characterize the size distribution of exhaust particulate from gasoline engine. Accordingto the results,particulate number concentrations show bimodal size distribution including nucleation and accumulation mode below the range of 50nm in coldstarting. While in hot start state, number concentration with bimodal size distribution different from coldstarting are less than 40nm in size.The distribution of particulate number,surface area and particulate mass characterized by nucleation and accumulation distribution mode goes below 40nm,and the trends go up with the increase of engine speed.
Design of Provincial Transportation Data Center for Industrial Integration and Intelligent Analysis
Authors: Zhou Zheng Bing
Published: October 2011

To meet the demands of data exchange and data sharing in informatization of transportation industry, and to eliminate of information islands, it analyzes the problems in construction of transportation informatization and presents cascade structure of data center in one province, designs general framework of provincial transportation data center aiming at industry management and business application in this paper. In this framework, it uses enterprise service bus (ESB) to realize the coordination in different industries and internal coordination in transport industry, and uses business intelligence (BI) to realize intelligent analysis in transportation industry, which provides reliable basic support for process integration and application.
Application of Numerical Simulation for Tire Rolling Resistance Measuring Method
Authors: Zhang Shao Guo , Gao Feng , Hang Bai Lin
Published: October 2011

As one index of product certification for vehicle tire, rolling resistance is difficult to measure. In order to evaluate feasibility of two test schemes for tire rolling resistance measuring equipment, a new approach to study rolling resistance was developed with displacement deformation. Establishment process of finite element testing model was introduced briefly. Using two test schemes separately, simulation analysis and numerical computation of tire rolling resistance were conducted by controlling the experimental parameters. The comparison results showed that angle test method was reasonable and displacement field response to load was good under different working conditions. Subsequently, change trends of simulation results and experimental data were contrasted. They all indicated that tire rolling resistance added as the load enhanced and the obtained conclusion was consistent with related theories. It was validated that angle test scheme was feasible for equipment development.
Medical Information Sharing Architecture Based on Cloud Computing
Authors: Li Hao , Xue Lei , Zhu Yan , Yang Chun Li , Chi Li Li , Wang Zheng , Zhang Zhao Lu
Published: October 2011

The existing independent hospital information system hinders the cooperation and integration of healthcare service processes. In order to solve this problem, hospital information architecture based on cloud computing was put forward through analyzing the characteristics of medical information. The platform, system architecture and key technologies of the hospital information architecture were discussed. Software prototype was developed by using Hadoop, Tashi and MapReduce and implementation of this model proved to be feasible and effective.
MDO of Anti-Creeper on High Speed Train Using Optimus
Authors: Liu Kai Jie , Zhao Hong Lun , Xu Chao
Published: October 2011

How to find the solution of multi-objective optimization quickly and exactly is the challenge of multi-objective optimization design. This paper explores the feasibility of multi-objective optimization solution briefly in theory, and makes a high-speed train’s anti-creeper as an example which using multi-objective design optimization software to find the feasible solution. Nastran and LS-Dyna are respectively adopted to solve the linear static and collision study analysis of the anti-creeper. In this paper Nastran and LS-Dyna are integrated on Optimus which is MDO platform to make a MDO of anti-creeper. The anti-creeper optimization analysis is proceeded based on many indexes satisfied, and its multi-objective Pareto solution of its minimum mass and biggest internal energy comes out. The method of multi-objective optimization solution in this paper is solved well in MDO.
Double-Loop PID Parameter Tuning for DC Motor Based on Modified Particle Swarm Optimization
Authors: Cheng Tao , Lin Wei Xing
Published: October 2011

This paper proposes a modified particle swarm optimization to solve identification of tuning PID controller parameters. This paper elaborates the process that MPSO algorithm optimizes PID parameters in double-loop speed control system modeled by simulink. Through analyzing the results of the MPSO optimization, and comparing with standard PSO(SPSO) and traditional method, MPSO algorithm has better dynamic performance, provides a high performance methods for PID parameters optimization.
Application of Least Square Influential Coefficient Based on Particle Swarm Optimization in Dynamic Balancing Measuring
Authors: Li Chuan Jiang , Zhang Zi Qiang , Wan Li Li , Li Yi
Published: October 2011

This paper presents a least square influential coefficient based on particle swarm optimization, putting balance weight as optimizing object, which can make residual vibration meet the expected demand. Experimental result shows that this method has high performance optimizing effect, and high percent of removed unbalance amount one correction, which is over 95%. So this method has very high practical value.
Study on the Wind Energy Utilization Coefficient Surface Identification of Wind Turbine
Authors: Xia Ja Kuan , Lu Shi Xuan , Huang Wei
Published: October 2011

By analyzing multi-parameter rotor power coefficient model used in wind generator system, fitting surface function and its nonlinear equations set are established. The nonlinear equations set is converted to the linear equations set by Newton method, and then the linear equations ser is being solved. This paper designs the method of collecting sample data to fit rotor power coefficient of wind turbine. Theoretical analysis proves that this method is effective. The example results show that the rotor power coefficient fitted by the method has high accuracy and better value of engineering applications, and is also suitable for the models of wind generator systems with different parameter perturbation situation.
Reservoirs Distribution and Hydrocarbon Accumulation of Ordovician Carbonate in Tazhong Uplift, Tarim Basin
Authors: Chen Mei Tao , Yang Ning , Yang Shang Ming
Published: October 2011

Many types of marine carbonate reservoirs are discorvered in Tazhong Uplift, and the later alteration is obvious. The marine sources rock including the Cambrian-lower Ordovician and the mid-upper Ordovician provided a great deal of hydrocarbon for the hudrcarbon accumulation. The hydrocarbon filled into all kinds of reservoirs many times to form the different types of reservoirs in later Caledonian to early Hercynian epoch, later Hercynian to early Indo-Chinese epoch, later Yanshanian to Himalayan epoch. All these made the characteristics of hydrocarbon accumulation complex very much.
Research on Recovery Voltage from Circuit Breaker Cutting Off Various Transformer Faults
Authors: Xia Wen Hua , Gong Mao Fa , Gong Zheng , Li Guo Liang , Xu Xin Yuan , Wu Jiang Bo
Published: October 2011

When a circuit breaker cuts off a transformer’s different fault types, there will be different voltage recovery processes. Studying on these transient processes provides bases for the section of breaker and the extraction of fault feature. Based on theoretical analysis and simple calculation, this paper uses PSCAD/EMTDC software to model and emulates every fault system. The results show that when a transformer takes place two-phase grounding fault, the peak of recovery voltage between circuit breaker’s both ends is highest. A conclusion is drawn that when to choose a breaker, pay attention to the two-phase grounding fault.
Study on Single Shaft Balance of Single-Cylinder Engine Based on Coupling of Optimization and Virtual Simulation
Authors: Han Xu , Lin Jian Sheng , Ji An Jian
Published: October 2011

At present, excessive balance is used for the balance of traditional single cylinder engine. Single shaft balance may also be used on single cylinder engine with large power and high rotation speed. In this article, a small single cylinder engine 250 is studied. By our research, the mass centre of excessive balance block is not at one straight line with the central line of cylinder to result in heavier horizontal vibration of whole machine. In this article, a modification scheme is offered. In this scheme, for more reduction of vibration, a balance device for single shaft is designed for machine, and find out reasonable installation place by optimization method such that the impact of additional torque, arising from the balance of single shaft, to vibration of whole machine may be reduced to min level to realize balance optimization of the machine.
A High Linearity Folded Gilbert Mixer for 2.4GHz Application
Authors: Li Kang , Zhu Chao Xian , Yang Xiao Feng , Feng Qian , Liu Chi , Huang Guo Dong
Published: October 2011

A 2.4GHz high linearity downconversion mixer is designed with MOSFET transconductance linearization technique. Multiple gated transistors (MGTR) (or derivative superposition) method is adopted in the structure to increase IIP3 of the mixer as well as its convertion gain isn’t degraded. In order to improve the performance of the mixer further, a LC tank is used in the LO stage and two current steering PMOS transistors in load stage. The Mixer is design in TSMC 0.35um SiGe BiCMOS technology. Simulation results show that the mixer achieves 2.88dBm input 1dB compress point, 16.18dBm third-order input intercept point (IIP3) and the conversion gain is 12.97dB.
Energy Regenerative Braking Feedback Lockup Electromechanical Integrated Brake System for Vehicles
Authors: Wang Guo Ye , Zhang Juan Li , Xiao Hang
Published: October 2011

Project the energy regenerative braking feedback lockup electromechanical integrated brake system for vehicles. Integrate EMB and friction brake system, and design the regenerative brake system, further choose the generator types respectively for the common gas engine car and electric car. Set up the system dynamic model. Based on the Matlab/Simulink, establish the simulation test system of the vehicles regenerative braking system. Using the simulation model for the Chery A3 car, we respectively simulate and analyse the braking and energy reusing performances of the low-brake strength and the high-brake strength regenerative braking models to the two brake systems. The study results indicate that the energy regenerative braking feedback lockup electromechanical integrated brake system for vehicles can satisfy the regenerative braking performance requirements of different vehicles according to the braking energy feedback quantity and the regenerative braking efficiency needed by the different vehicles, so the application is wider. The brake system does not only have higher regenerative braking efficiency, but also can guarantee the vehicles braking safety.
Research on SOC Estimation of LiFePO4 Battery in HEV
Authors: Zheng Yan Ping , Wang Han , Du Zheng Ping
Published: October 2011

For power distribution between engines and electric motors and the dynamic battery management SOC of the dynamic battery in HEV is an important parameter. To estimate SOC accurately LiFePO4 Battery was taken as study object in this paper and based on the characteristic experiments of the LiFePO4 Battery a new combining algorithm of estimating SOC has been put forward which combined Ah counting method, equivalent circuit model and open circuit voltage method. The simulation model of SOC algorithm in MATLAB was created in the paper and the results of simulation have indicated that the new strategy of estimating SOC was feasible and accurate.
A Fuzzy-EAHP Method of EW Equipment`s Reliability
Authors: Wu Wei Lu
Published: October 2011

The index system of communication EW equipment`s Reliability can be qualitative and quantitative and multi-hierarchic.The method is used to evaluate communication EW equipment`s Reliability, which combines EAHP and fuzzy synthetic evaluation. Examples indicate that the method is feasible.
Application of Cluster Analysis and Trend Extraction in Wind Speed Series Consistency Correction
Authors: Zhang Yang , Wu Li Ming , Wang Zuo Min
Published: October 2011

In recent years, as affected by climate change and human activities, wind speed shows an obvious downward trend. According to the following three correction methods : correction of the cluster analysis and mean equality, correction of the trend extraction, and the combination of the aforementioned two methods, the wind speed series which meets the consistency requirement of frequency calculation is obtained in this paper. Practical application shows that the correction methods have good adaptability, correction result and great practical value.
Modeling and Simulation of Brushless DC Motor with Nonideal Back EMF
Authors: Zhao Ying , Yang Yong Jun
Published: October 2011

The back electromotive force (EMF) waveform of brushless dc motor (BLDCM) is trapezoid. But it is not absolutely trapezoid because of motor manufacturing. In this paper, a method of modeling for BLDCM with nonideal back EMF is presented. Eighteen states during an electric angle cycle are obtained after the nonideal back EMF of BLDCM is analyzed. The S-Function of MATLAB is used to generate the nonideal back EMF according to rotor speed and position. The pulse width modulation (PWM) current control of BLDCM is adopted. Simulated results validate the method.
Application of HHM in Risk Identification of Tunnel Project
Authors: Song Ti , Wei Lian Yu , Sun Wen Xia , Sun Wen Feng
Published: October 2011

Tunnel project contains complex and diverse risk factors. Risk management has an important role on tunneling engineering projects. Risk management is based on risk identification. Only with sufficient knowledge of risk can we analyze,evaluate and control the risk .Traditional risk identification methods are generally targeted at a certain stage of the tunnel project or a particular content of the tunnel project. It can not consider all factors of the tunnel projects. This paper presents a new risk identification method - hierarchical holographic modeling. The method provides a multi-angle decomposition to the perspective of the tunnel features and in order to find the tunnel project risk source. It can provide a basis for risk management.
Design of Fuzzy PID Controller for Water Level of Boiler Steam Drum Based on DSP
Authors: Xin Yuan Fang
Published: October 2011

A control system for water level of boiler steam drum based on DSP microprocessor is designed in this paper. The technique of fuzzy control was applied to controlling the water level of the steam drum, the operational principle and application of the fuzzy-PID arithmetic are described. The water level controller with good control effect is developed. Firstly the hardware structure of system is introduced in the paper and then investigates the fuzzy-PID arithmetic carry out, and finally, the simplified program flowchart are given.
Elevator Door Automatic Control System
Authors: Zhang De Min , Liang Xue Hui
Published: October 2011

The elevator control system is an important component of the modular elevator control system. The control and profile and PWM-pulse pattern generation are done by a microprocessor system. Position recognition, security and motor/inverter protection functions are implemented. Furthermore the microprocessor system has to establish the communication via the serial link (Multidrop protocol) with the motion command subsystem, from where it gets the door commands.
The Potential of Phosphorus Removal in UASB Reactor
Authors: Lu Ping , Ding Tao , Li Jin Ye , Mu Jin Xia
Published: October 2011

The potential of phosphorus removal rate was investigated using a lab scale UASB reactor The volumetric phosphorus removal rate was up to 20 mgP/L•d, and the phosphorus effluent concentration was below 0.5 mgP/L under high organic loading rate. Biological phosphorus assimilation could be the main pathways of phosphorus removal in UASB reactor, and the organic loading rate could be the main factor affecting phosphorus removal.