bluuebunny/crossref_metadata_2025 huggingface dataset:
A New Method of Calculating Recovery of Waterflooding Reservoir by Using Production Rate
Authors: Fu Li Bing , Zhao Lun , Zhang Yu Feng , Ji Ze Min , Hou Qing Ying , Fan Zi Fei
Published: June 2013

Development characteristics of oil field during production-decreasing stage were analyzed in this paper. The ultimate recovery factor can be determined at a limit of oil production rate by investigating the relationship between production rate and recovery percent. Some physical conditions were given. Based on the mass conservation principal and seepage mechanics method, it was found that the recovery degree varies versus production rate linearly. The model prediction using the actual data of west Ng63+4oil strata in Gudong 7 region, a reservoir in Shengli oilfield of China, was performed. The results demonstrated that the linear model had well estimation of the recoverable recovery of oil fields which were at the later period of high water cut stage.
Optimization of Extraction Technology of Favonoids from Kandelia Candel Leaves by Using Response Surface Methodology
Authors: Ji Yan Ping , Li Cheng Ping , Xu Xing , Tang Lan , Tong Qian
Published: June 2013

This work is to extract flavonoids using ethanol refluxing method from the Kandelia candel leaves which are rich in flavonoids. Ethanol concentration, solid-liquid ratio, temperature and extraction time on the extraction rate were investigated by the single factor experiments. Box-Behnken design (BBD) based on response surface methodology (RSM) was adopted to optimize the parameters. The results showed the best extracting rate was more than 7.74%, when the extraction parameters were ethanol concentration 60%, extraction time 0.5 h and temperature 80°C.
Preparation of GR/HRP/Chit Modified Electrode and its Electrochemical Behaviors
Authors: Shu Hao , Shang Yan Li , Cui Han , Wan Qi Jin , Yang Nian Jun
Published: June 2013

Horseradish peroxidase (HRP) was immobilized on the glassy carbon electrode surface by using GR, and GR/HRP/chit modified electrode was prepared. The electrochemical behaviors of GR/HRP/chit/GCE were studied by many electrochemical methods. ImmobilizedHRPshowed a pair of stable redox waves, and oxidation peak was very small, the reduction of peak potential for 0.33 V vs. SCE and retained its bioelectrocatalytic activity for the reduction of H2O2. At the same time, a series of related parameters of the enzyme electrical activity were calculated, further experimental results reflected the enzyme mechanism in the process of reaction.
Experimental Study of Gas Humidity on the Dielectric Barrier Discharge Influence
Authors: Liang Ya Hong , Cheng Gao Ju
Published: June 2013

Objective: to exam the impact of the gass relative humidity on the dielectric barrier discharge. Method: high voltage AC power supply and wire-cylinder reactors are used to observe the discharge characteristics of empty reactors and reactors with the ceramic filler respectively under different relative humidity circumstances. Results: in the empty reactors,the discharge current decreases with the increase of the gas relative humidity; in the reactors with ceramic filler,with the increase of the gas relative humidity, the discharge current first decreases slowly and then increases immensely. Conclusion: Relative humidity has a significant impact on gas discharge. By comparing the experimental results of the two groups, the conclusion is: when RH< 47%, the discharge current of the empty reactors is greater than that of the reactors with ceramic filler,and when RH > 47%,the result is just the opposite.
Metal Flow Velocity in an Intake Port in the Process of Die Casting
Authors: Gaspar Stefan , Pasko Ján
Published: June 2013

The paper deals with metal flow velocity in an intake port in the process of die casting. In the theoretical part the author defines theoretical knowledge from the field of the mold cavity filling regime and the velocity of pressing the melt into the mold cavity. The practical part focuses on the impact of metal flow velocity in an intake port and the filling regime of the pressure foundry mold cavity, related to the former, on the homogeneity of the casting.
Study of Solidus Velocity on Porosity Formation in A201 Aluminum Alloy Castings
Authors: Kuo Y.S.
Published: June 2013

The purpose of the present study was to discuss the effects of solidus velocity on porosity formation of A201 aluminum alloy plate castings. With systematic change in the riser size, together with variation of thickness and length, were cast in sand molds. The sand molds with end chill for the plate castings were made of 100% silica sand. The porosity content of A201 aluminum alloy was affected by the solidus velocity in this study. The correlation between porosity content and solidus velocity is found to be split into 2 bands, each being associated with one of the different thickness of plate castings.
Using the Theory of Spline Function to Implement the Optimal Dispatch for Mechanical Arm
Authors: Ma Shao Jun
Published: June 2013

The researching about mechanical arm in Chinese domestic is still in the initial stage, therefore this topic is selected. The researching is doing from two aspects, they are theoretical analyzing and empirical analyzing. Through using the theory of spline and the theory of optimization, establish the mathematical model. Then in the empirical researching, the mathematical model is used. After a series of empirical tests, the correct of theoretical analyzing and empirical analyzing is confirmed.
A Novel Bidirectional Z-Shaped Thermally Actuated RF MEMS Switch for Multiple-Beam Antenna Array
Authors: Pal Jitendra , Zhu Yong , Lu Jun Wei , Dao Dzung Viet
Published: June 2013

In this paper RF MEMS switchis designed for dielectric-embedded electronically switched multiple-beam (DE-ESMB) antenna array. To achieve small stiffness without buckling, a novel bidirectional Z-shaped thermal actuator is used instead of V-shaped thermal actuator, which can generate large displacement and high contact force at low actuation voltage. With the actuation current from-0.6 A to 0.6 A, the electrothermal actuator can achieve a bidirectional motion in a dynamic range of-10.08 μm to 10.17 μm.RF performances are improved by suspending the structure 25 μm from the substrate using MetalMumps process. An ON state insertion loss of-0.14 dB at 10 GHz and an OFF state isolation of-67 dB at 10 GHz are achieved on low resistivity silicon substrate.
Microfabrication and Characterization of Stack Coupled Inductor Coils for Magnetic Sensors and Actuators
Authors: Yunas Jumril , Burhanuddin Yeop Majlis , Roer Eka Pawinanto
Published: June 2013

A Planar square stack coupled inductor coils on silicon substrate has been fabricated using MEMS technology. The fabrication process utilized a simple, cost effective process technique as well as CMOS compatible resulting to a reproducible and good controlled process. The basic characteristics of the coupled inductors were discussed in wide range of operating frequency. The analysis results showed that the geometry of the inductor coil strongly affects the basic characteristics of the coils. The results of the study have promised a good prospect for the development of fully integrated planar magnetic field generator for sensing and actuating purposes.
A Soft Decision Making Model for Detail Preservation
Authors: Jeon Gwang Gil
Published: June 2013

A soft decision making model is verified its applicability in explaining variety of engineering issues. In particular, fuzzy rule-based inference approach is an important part of fuzzy set theory, where the number of prosperous applications is rather seldom, and few applied topics are known and executed so far. The processing for format conversion approach is one of them. In this paper, we proposed fuzzy rule-based inferring system for image format conversion. A new method for linguistic image processing based on fuzzy logic is provided, and its visual quality comparison on reconstructed image is examined.
The Study on Disturbing Force of Dynamic Mechanical Systems Using Kalman Filter Techniques
Authors: Jing Zhang
Published: June 2013

According to the approach presented in this paper, the disturbing force of dynamic mechanical systems can be estimated using Kalman Filter techniques. It has been shown how multiple sensors can be included to improve the estimation accuracy and how the algorithm responds to changing parameters and model inaccuracies. Finally, the approach has been experimentally verified with a MEMS-sensor and a more complex dynamic structure of a milling machine with active magnetic guides. Future enhancements may especially regard the model side, since the estimation accuracy is directly determined by the model quality.
Fault Current Limiter Based on Series Voltage Source Inverter
Authors: Li Hua , Han Dong Ming , Zeng Ling Quan
Published: June 2013

The installation of Fault Current Limiter (FCL) brings many advantages to power systems. Therefore, in recent years, many kinds of FCL have been developed. This paper describes a new type of FCL, it’s composed by a tandem resistance and a self rectified voltage source inverter, connected to the distribution line by a coupling transformer. It realizes the limiting by controlling the reactive power. Its prominent features are: simple configuration, lower voltage level. This paper aims to evaluate the operating characteristics of such FCL in both simulation and experimental research ways.
Numerical Study of the Effect of Propellers Skew on Cavitation Performance
Authors: Zhu Zhi Feng
Published: June 2013

The effect of propeller skew on cavitation distribution, thrust and the torque is studied numerically. With the hybrid grid strategy and the sliding mesh, the Unsteady Navier-Stokes (N-S) and the Bubble Dynamics equations were solved to predict the vapor volume fraction around ships propellers blades. The numerical predictions of the sheet and the tip vortex cavitation of the propeller E779A are in agreement with the results in other literature in general. For propeller models DTMB, the proper increase of the propeller skew angle may enhance the hydrodynamic performance.
Finite Element Analysis of Rubber Sealing Ring Resilience Behavior
Authors: Qu Jia , Chen Geng , Yang Yu Wei
Published: June 2013

In this paper, hyper-elastic constitutive models of rubber material have been summed up based on constitutive relation and the Mooney-Rivlin model has been pay more attention. Then through the tension experimental test, data of sealing material under axial experimental are obtained, and M-R model parameters C10 and C01 are fitted by ANSYS. After obtaining the material parameters, compression deformation behavior and the distribution of stress field and resilience behavior of the seal ring are simulated by using ANSYS/LS-DYNA software under different loading conditions.
Research on Inertia Projecting Devices to Eject Water Column for Hydraulic Impact Tests
Authors: Liu Xian Jun , Wang Xiao Long , Li Si Zhong , Zhong Wei Zhou , Zhou Ben Quan
Published: June 2013

In order to eject water column with regular shape for hydraulic impact tests, inertia projecting devices are developed. In these devices, a projecting cylinder filled with water is accelerated under huge push of gas gun. When arriving to set speed, the cylinder would impact buffer and suddenlly halt. Then water column in the cylinder will eject under inertial function. In the device for ejecting smaller water column, as impact force is small, projecting cylinder is made of high strength steel material, and can be used again after impacting buffer made of rubber material. In the device for ejecting larger water column, as impact force is huge, projecting cylinder is made of low strength steel material, and will damage after impacting buffer made of high strength material. Using these devices, tests are respectively conducted to eject water column with masses of 30kg and 800kg, and speed and shape of water column all satisfyed requirement of .hydraulic impact tests.
Research on Control of Heat Flux Environment Simulation for High-Speed Aircraft
Authors: Wu Da Fang , Wang Yue Wu , Wu Shuang , Yang Jia Ling , Gao Zhen Tong
Published: June 2013

The characteristics of the transient heating control process of aerodynamic simulation experiments are complicated, transient, highly nonlinear, and strongly coupled, which make it difficult or impossible to develop a mathematical model. By using the fuzzy control method, many good qualities (such as robustness, high adaptability to changing parameters, and a short transition process time) can be obtained. Based on the fuzzy control method, a transient aerodynamic heating simulation control system for missiles was established. It was demonstrated that quick dynamic control of the aerodynamic simulation heating process according to the transient and continual change in heat flow on the surface of high-speed aircrafts can be completed by using this control system.
Research on the Mean Shift Target Tracking and Recognition Technology Based on Multi-Feature Fusion
Authors: Peng Yong Jun , Tan Fen , Sun Jun
Published: June 2013

This article topics based on multi-feature fusion the Mean shift target tracking technology belongs to the field of intelligent video analysis, moving target tracking is interested in moving target location each image in a video sequence to find and acquire the target movement. Moving target tracking problem can be stated as interested in moving target movement prediction in the video sequence, feature extraction, feature matching and template update problem. In this paper, we consider using compressed domain features as a complement of the color features to extract the compressed domain features first need to understand the compressed domain detection technology. Detection based on the compressed domain, that is, in the case of not decoding or a small amount of decoding, directly on the compression characteristics of the image analysis, in order to achieve the detection of the image moving object.
The Real-Time Interactive Smart Energy System Based on the Internet of Things and Cloud Computing
Authors: Chen Liang , Wang Yang , Yang Shi Wang , Gu Xue Ping , Xu Yan
Published: June 2013

A real-time interactive smart energy system is designed based on the internet of things and cloud computing, which is composed of Smart Meters, Smart Terminals, Smart Power Plugs and Cloud computing service system. Combining with Smart Gird property and the internet of things technology, the smart energy system provides the full range interaction of Power companies-Internet of things equipments-cooperation between the equipments. Meanwhile, the offline decision mode is supported by the expert system and the online decision mode is provided by the Cloud computing service system, making it both reliable and real-time in transaction processing. Eventually, the smart energy system can achieve real-time visualization, diversified interaction, smart interaction and scientific decision-making.
Placement Optimization of Smart Piezoelectric Rods for Shape Control of Large Cable-Network Antenna Structures
Authors: Liu Wang , Li Dong Xu
Published: June 2013

Large cable-network antennas are typical flexible space structures, which will inevitably generate deformations under various disturbances from out space. To avoid the degradation of shape accuracy due to deformations, it is imperative to find effective approaches to implement shape control for such antennas. In this paper, a novel application of smart piezoelectric rods that are mounted in the ring truss supporting structure of the antenna is presented to solve the shape control problem. The control mechanism is to generate displacements in opposite direction to resist primal deformations by using the direct piezoelectric effect of piezoceramic materials. Based on the genetic algorithm, optimal locations of the smart piezoelectric rods used for shape control is analyzed in the study. Numerical results demonstrate that the present shape control approach with appropriate placement of smart piezoelectric rods is feasible and effective.
Phase Transition Study of CaB6 under High Pressure
Authors: Wang Jia , Peng Gang , Wu Bao Jia
Published: June 2013

Phase transition of CaB6 sample under high pressure was studied by in situ electrical conductivity measurements and synchrotron X-ray diffraction up to 26GPa. Three anomalies in conductivity change were found respectively at 3.7, 12.4 and 21.9GPa. X-ray diffraction reveals that CaB6 transforms from Pm3m to orthogonal structure at 12.32GPa and hence the abnormal conductivity change at 12.4GPa can be attributed to the structural phase transition. The other two anomalies were considered as pressure-induced electronic phase transition in the pressure range of our measurements.
Stepless Adjust Light
Authors: Ye Xiang Mei , Zhou Qing Hong , Zhang Pei Zhong
Published: June 2013

This system based on single chip PWM dimming technology, with LED lamp as light source, STC89C52 be used as the core of the host device. The PWM control technique be used to realize the energy saving of LED lamp, on-off, brightness and so on. The circuit structure is simple, low cost, easy to operate, can be widely applied in real life.
Study of the Smart Voltage Control Strategy Based on Three Types of Dates
Authors: Xue Lei , Song Shu Yong , Li Meng Zan , Gao Hong , Hao Wei , Wang Ting
Published: June 2013

Based on the characteristics of the three types of data from the system of WAMS (Wide Area Measurement System), SCADA (Supervisory Control And Data Acquisition) and Fault-recorder, this paper present an algorithm to do the voltage or reactive power optimization based on the primal-dual interior point method, and a new method to filter out the noise in state variable based on the standardized residuals. The flow chart proposes a new scheme to use the WAMS real-time data to improve the accuracy of voltage and reactive power control. Keywords: WAMS, voltage and reactive power control, primal-dual interior point method, standardized residuals.
Electric Fatigue in Metal/Ferroelectric Polymer/SiO2/p-Si Capacitors
Authors: Hu Jing Hang , Yan Xue Jian , Zhu Guo Dong
Published: June 2013

In recent years ferroelectric polymer-based nonvolatile memory devices have attracted much attention due to their flexibility, transparency and ease of production. However, their electrical stability is seldom studied. In this letter we report the observation of electric fatigue in metal/ferroelectric polymer/SiO2/p-Si capacitor memories, which is compared with the electric fatigue obtained from metal/ferroelectric polymer/p-Si capacitors. Our experiments indicate that the existence of SiO2 layer has greatly improved the fatigue endurance in metal/ferroelectric polymer/SiO2/p-Si capacitors. We also discuss the possible mechanism causing this improved fatigue endurance.
Study on RBF Network Adaptive Control for Robot Loading Based on Uncertainty Compensation
Authors: Li Hua , Xu Da , Zhong Meng Chun , Zhang Jian , Zhang Chun Lin
Published: June 2013

In order to meet fast and accurate auto-loading, insure stable system, fast minish error, and minish interference signal influence, RBF network adaptive control based on uncertainty compensation is adopted in this thesis. By simulation, simulation results show that this control method can meet control requiements.
The Research of Intelligent Greenhouse Alarm System Based on CC2530
Authors: Hu Liang Yi , Zhang Ying Yan , Xin Zheng Hua
Published: June 2013

In order to realize the automation of farming, the alarm system based on CC2530 was designed in this paper. This study used the temperature and humidity sensor SHT10 to collect data. The system reversed the type of data to the integer. The system was based on the CC2530 which is integrated with the ZigBee protocol. To achieve the effect of the automatic alarm, this work set a standard temperature value. When the actual temperature exceeded it, the system called the buzzer automatically and made all the LED lights work. And the value of temperature and humidity after the conversion would be displayed on the LCD screen. The system can complete the control of temperature and humidity in the greenhouse.
The Test System Design of Multi-Junction Solar Cell Spectral Response
Authors: Bai Fang , Cheng Ke Yuan , Li Shan
Published: June 2013

The main topic is on doing research and testing methods and theories of the triple-junction solar cell and design its electrical performance test platform. Provide a theoretical basis and feasible experimental triple-junction solar cell performance testing. The electrical properties of the electrical properties of solar cells is the main consideration for its use as a power, a very important one is the spectral response curve of the test. Demonstration program and platform for the entire system, the P / N junction between the optical and electrical characteristics of multi-junction solar cells affect each other, related to the key issues, including: monochromatic excitation light source, optical bias, the theory and technology of electrical bias, weak signal detection. Important application prospects based multi-junction solar cells, its theoretical method and test device to become an important and innovative topic.
Research on Aluminum Electrolytic Multi-Fault Diagnosis Method Based on Immune Genetic Algorithm
Authors: Li Jie Jia , Guan Wen Yue
Published: June 2013

As for a wide variety of faults that happen frequently during the aluminum electrolysis process, a new method of multi-fault diagnosis method using neural network based on immune genetic algorithm (IGA) is proposed. IGA has the abilities of searching for global optima and better convergence. By applying these abilities and the diagnosis characteristics of the aluminum electrolysis process, the study builds the layered fault diagnosis model structure . The results of simulations show that this model is of the better ability of convergent on whole solution space and the capacity of fast learning than that of the traditional fault diagnosis model, therefore, the method worths applying widely.
Research on Fault Injection Technique for Auto-Loader Based on PLC
Authors: Wang Guo Hui , Jiao Qing Long
Published: June 2013

The auto-loader is the core part and the key technique in the weapon system of tank.This paper mainly introduces and discusses the structural principle and the failure causes of auto-loader,using PLC reforms the hardware circuit of auto-loader simulator,besides setts common faults in the auto-loader simulator,finally the teacher checks the ability of the student through the touch screen.It is feasible on the result of the technique emulation and supports the maintenance training of auto-loader.
Acoustic Emission Evaluation of the Pitting Corrosion Damage on the Cut-Stubble Disc Sickle
Authors: Li Bao Yu , Zhang Wei , Wang Hong Li
Published: June 2013

Disc Sickle; Acoustic Emission evaluation; pitting corrosion damage Abstract. By the pitting corrosion simulation test in the laboratory, the law that the Disc Sickle corrosion degree and AE signal vary with corrosion time has been studied, and relationship curve between corrosion damage and AE parameter has been obtained. This explains that AE technology can be used for detecting forepart pitting corrosion, researching the law of pitting corrosion development, and evaluating corrosion damage.
Analysis on Simulation and Experiment of the Drill-Pipe Cross-Section Deformation of Ultra-Short Radius Radial System
Authors: Wang Hui Yi
Published: June 2013

Abstract. The drill-pipe bending is a plastic with complex loads. The ratio for wall thickness to tube radius is out of the limitation of thin-walled shell. Contrary to general drill-pipe, the URRS is not elastic but plastic. Beam element cannot be used to URRS because the cross-section is changed during bending. Contrary to buckling theory, the sizes of two bending axes changed independently by using of 3D FEM simulation, and the secondary bending axis is based on loads degree whether it expands or contracts. The simulation extends the deformation theory of drill-pipe bending. The deformation of pipe cross-section is weakly dependent on the backpressure absolution, compared with the pressure difference between inner and outer. The FEM simulation well agrees with the experiments results.
Design and Analysis of ADAMS Simulation for a New-Type Automobile Steering Mechanism
Authors: Zhang Jin Xi , Cai Wei , Tan Fen
Published: June 2013

This paper puts forward a new type of pure rolling automobile steering mechanism, which is verified accord with the Ackerman principle, also, through the software ADAMS, simulates and analyses the motion performance and the transmission force of this mechanism compared with traditional Ackerman Steering.
Key words: steering mechanism; Ackerman principle; ADAMS; pure rolling
Design and Structure Strength Analysis of Double-Deck Prestressed Sectional Female Die
Authors: Lv Qing Qing , Yang Li Quan , Zhao Lei
Published: June 2013

Monolithic die often early failure due to tangential cracking in the production process of the bush by cold extrusion; Derived through theoretical calculations based on the study of the bush forming process technology, a reasonable interference quantity, contact stress, designed to double-deck prestressed sectional female die, established a reasonable boundary conditions of the finite element model; using ANSYS Workbench as a platform, the work process of the double-deck prestressed sectional female die are studied by numerical simulation, preliminary forecast of the distribution of the stress field of the sectional female die in no-load and work process, compared to the working strength of the original monolithic die, verified the superiority of prestressed sectional female die, provided a valuable reference for the actual production.
Design of a Microfluidic Dielectrophoretic Chip for Trapping Two Particles
Authors: Chen Tao , Li Shao Qian , Pan Ming Qiang , Liu Ji Zhu , Wang Yang Jun , Chen Li Guo , Sun Li Ning
Published: June 2013

A kind of microfluidic chip based on dielectrophoresis(DEP) is designed for the purpose of trapping two particles with different sizes. In order to reach the purpose, the microfluidic chip is designed and fabricated. The results show that the chip can complete pairing two particles with different sizes successfully.
Dynamic Analysis of Gear Mesh for Gear Pump Based on ANSYS Workbench
Authors: Zhao Lei , Lv Qing Qing , Yang Li Quan
Published: June 2013

Based on the FEA software ANSYS Workbench, the soft body dynamics performance of the gear pump gear mesh of a hydraulic pump company was analyzed. In the practical engineering applications, gear pump gear teeth are effected by alternating pressure in the two working cavity. It can cause pitting corrosion damage for gear tooth, and even cause tooth crack and fracture. At first, a three dimension finite element models of the gear pump gear teeth was established. In the start-up process, the gear pump tooth mesh deputy of tooth contact stress strain and dynamic characteristics of gear teeth was analyzed. Obtain the velocity curves, acceleration curve and tooth contact stress and strain dynamic curves of the tooth of gear pump. Providing a new analysis method for gear pump of gear Structure design and having a practical application value.
Hydrogen Properties of Lithium Doped Stannic Oxide Thick Film Sensors
Authors: Ning Tao , Zhang Mao Lin , Qi Yong Shun
Published: June 2013

Gas response properties of lithium doped (1%~8%) SnO2 sensing films were investigated when exposed to hydrogen gas. Sensors were prepared by thick film technique. X-ray diffraction (XRD) and scanning electron microscope (SEM) were used to characterize the crystal structure and grain size of the prepared materials. The gas response properties indicated that the response time reduces obviously with the Li-doping. It was found that 4 mol% Li-doped sensing film exhibits the best response characteristics. The response mechanism was suggested to arise from the conduction holes ionized by Li and the surface potential barrier change in target gas.
Dynamic Performance Analysis of Submarine Screw Compressor Deballasting System
Authors: Zhang Ke Long , Ma Shi Hu , Lao Xing Sheng
Published: June 2013

One dimensional dynamic model for submarine low pressure screw compressor deballasting system performance analysis is developed. Cross section of outer shell of ballast tank is described as cylinder, one dimensional flow equations combined with screw compressor performance model are employed to describe compressors flow characteristic. Coupled effect between gas pressure in ballast tank and discharging performance of screw compressor is considered in the presenting model as gas leakage during compressing process is taken into account. Deballasting duration for one certain submarine model is calculated using the developed model, and the result agrees well with that obtained by using Chinese state code for submarine low pressure system design. For different cross section tank models as circular section model, parabolic section model and trapezoidal section model, dynamic performance of screw compressor deballasting system is studied using the validated model. Gas pressure in tank, dropping speed of tank water surface and draft of submarine are simulated, and the results show that little difference of deballasting duration is caused by changing tank cross section. The most stable deballasting process is achieved by using a circular section tank. Deballsting performance is also studied as tonnage of submarine and volume of ballast tank change and commonsense conclusions are obtained.
EMD Analysis of Power Harmonics
Authors: Zhang Kai Tuo , Li Ming
Published: June 2013

It can obtain intrinsic mode function (IMF) of signal wave with empirical mode decomposition (EMD) in harmonic analysis of power system. Harmonic frequency, amplitude and duration can be obtained through analysis of IMFs. Through EMD analysis on distortion waveform of single-phase AC inverter output as an example, combined with applied scene of distorted voltage, cause of distortion waveform can be deduced. The result shows that EMD analysis on non-stationary signals is of good performance, and a new substitute method of FFT transform in harmonic analysis.
Failure Analysis and Welding Repair for Water Wall Tube Burst of 600MW Station Boiler
Authors: Zheng Xiang Feng , Chen Er Song , Wang Qing , Zhao Ji Feng , Dong Guo Zhen , Li Wen Bin , Wu Nan , Feng Yan Ting , Wang Qiang
Published: June 2013

Through methods, such as microscope analysis, mechanical analysis, chemical analysis, metallography examination etc, the causes resulting in water wall tube bursting of 600MW station boiler have been analyzed. The result indicates this water wall tube burst is the high temperature creep fracture. The higher operating temperature, microstructure aging and high temperature strength degradation are the primarily inducement of bursting failure. In welding tube, the measures of reducing residual stress, such as lower welding heat input, reducing thickness of welding layer, assigning reasonably heat treatment power, lengthening holding time and so on, were taken. The welding repair succeeded greatly.
Influence of the Temperature on Ultimate Strength of 93WNiFe Alloy
Authors: Xu Ying Ge , Wang Liang Liang , Wu Ze Wei
Published: June 2013

The Ultimate Strength of 93WNiFe alloy was investigated by dynamic tensile testing with temperature ranges from 10 to 900 degrees. The ultimate strength of 93WNiFe alloy declined gradually as the temperature increased, and it appeared a protruding at the temperature 400~700°C. Deposition of ternary system alloy make the W-W, W-M interface of tungsten alloy improved.It was the reason of the protruding appeared in tungsten alloy.
Finite Element Analysis of Glass Lens Molding Process
Authors: Ouyang Ling Jiang , Zhang Jian
Published: June 2013

Glass lens molding process is a high-volume fabrication method for producing optical components. In this paper, combined with thermal-mechanical coupled analysis and finite element method (FEM) simulation, An axisymmetric model of the GMP is built. Based on this model, FEM on the basis of the commercial FEM software MSC.Marc is conducted to study the pressing process in glass molding. The effects of molding temperature, pressing velocity, and friction on maximum residual stress are calculated. The result shows that the stress decreases at the higher molding temperature, lower pressing velocity and friction.
Finite Element Analysis of Working Process for Flexible Collet
Authors: Lv Qing Qing , Zhao Lei , Lv Xiu Ting , Yang Li Quan , Wang Xi Kui
Published: June 2013

Based on the study of the working process for flexible collet, establish reasonable finite element model and set reasonable boundary conditions, a preliminary analysis for the deformation, strain distribution and the stress distribution in the working process of flexible collet is launched, then predict the possible locations of stress concentration and fatigue, which provide a reliable basis for optimum design of collet device.
Kinematic Analysis and Structure Parameter Optimization of Automobile Wishbone Independent Suspension
Authors: Gan Hui , Zheng Ying Jie
Published: June 2013

Abstract A multi-body dynamics calculation model for air suspension guide mechanism of car is established, which analyses the motion model and its application of guide mechanism on car double wishbone independent suspension by using the basic theory of rigid body motion, and then carries out kinematics analysis to make the design work rational, simple and accurate. The establishment and optimized analysis of the structure parametric design model, which is used for the objective function of minimum variation of the caster angle, kingpin inclination angle, wheel camber, wheel toe-in angle and wheel tread, gets the reasonable and optimization design scheme of structure parameters for air suspension guide mechanism, and provides a theoretical basis for further improvement of this automobile suspension system.
Kinematics Simulation and Experimental Study of CVT with Diclinic Cam Plate Synchronous Revolution and Internal Power Shunt
Authors: Li Yuan , Yue Jie , Huang Qiu Bo , Sun Yan Ping
Published: June 2013

Established the precise model and completed the virtual assembly of CVT with diclinic cam plate synchronous revolution and internal power shunt application of Pro/E software basing on the transmission principle. Obtained the displacement, velocity and acceleration time-dependent curves of nine plungers centroid through the simulation of transmission operation, based on the simulation analysis gaining that the transmission does not exist in dynamic and static interference, and the structure design of CVT is reasonable. Completed the processing of CVT manufacturing, experiments are carried out to verify the simulation analysis of the transmission of real.
Parallel Simulation of Scramjet with Multilevel Hypergraph Partitioning
Authors: Zeng Yao Yuan , Zhao Wen Tao , Wang Zheng Hua
Published: June 2013

As one of the most considerable methods to study hypersonic flight vehicle, the numerical simulation of supersonic combustion ramjet (scramjet) has drawn an ever increasing attention at present. Nevertheless, the traditional serial simulation is ungratified for current research requirements because of high calculation precision, avaricious memory overhead and overlong computation time. Meanwhile, the efficiency of parallel simulation using the domain decomposition method is not very satisfactory. In this paper, we study on a general algorithm for scramjet design, and subdivide the computing domain by using a multilevel hypergraph partitioning algorithm. In order to reduce computation while enhancing the degree of parallelism, overlapping communication with computation and non blocking communication is adopted to decrease the communication time when dealing with global communication. Finally, experimental results testing on a China-made supercomputer show the smallest value of parallel efficiency is more than 48% when the number of processors is 256. In conclusion, the result indicates that our parallel algorithm is simple, effective and practical in scramjet simulation.
Modeling of Phase Transformation for TA15 Titanium Alloy During Heat Treatment
Authors: Zhao Hui Jun , Wang Bao Yu , Lin Jian Guo , Yang Lei
Published: June 2013

In this paper a phase transformation model with the temperature has been used to predict the percentage of phase at different temperature for TA15 titanium alloy during heat treatment. Heat treatment tests were conducted on TA15 samples at different temperatures ranging from 850°C to 1000°C. The material parameters were determined by using the test results and an Evolutionary Programming (EP)-based optimization method. Good agreements between the experimental and computed results were obtained.
Research on NDT Technique for Thick-Walled Metal Parts of Power Stations
Authors: Hao Xiao Jun , Zhao Ji Feng , Niu Xiao Guang , Zheng Xiang Feng , Liu Chang Fu
Published: June 2013

A NDT technique suited to inspecting thick-walled metal parts of power stations is comprised of time-of-flight-diffraction technique, Pulse-echo technique and magnetic particle inspection technique or dye penetrate technique. Flaw sizing accuracy and probability of detection can be improved greatly with application of the technique, and the risk of components` failure can be decreased greatly.
Simulation Analysis of Reciprocating Cutter Based on ADAMS
Authors: Wang Xiang Chun , Cai Nan , Zhang Weng
Published: June 2013

We developed reciprocating cutter, then use software ADAMS to optimize and improve it. The output of simulation shows that the cutter performance is good, while vibration problem exists at the same time.
Study on the Flow Behavior of Underbalanced Circulative Micro-Foam Drilling Fluid
Authors: Guo Li Ping , Wang Lei
Published: June 2013

Underbalanced drilling is a new method for the exploratory development of low pressure and permeability reservoirs; circulative micro-foam drilling fluid is a new technology which is developed for realizing near-balanced drilling and underbalanced drilling. The flow behavior of circulative micro-foam drilling fluid in wellbore was researched by applying HPHT experiment apparatus. It is concluded that the flow behavior parameters of circulative micro-foam drilling fluid is only related to temperature but not to pressure; the constitutive equation accords with the rheological law of power-law fluid, the expressions of consistency coefficient and liquidity index were obtained through analyzing the flow behavior experiment data under the condition of HTHP. The density of circulative micro-foam drilling fluid increases as the increase of pressure and decreases as the increase of temperature, but in wellbore the rate of increase as pressure is greater than that of decrease as temperature, so the density of drilling fluid in wellbore is greater than that under ground condition. The fluid drag force of micro-foam drilling fluid in annulus were analyzed theoretically and the pressure distribution formulas of micro-foam drilling fluid in wellbore were given.
Study on the Multiple Effects of Flow between Two Air Jet Flows of Different Eddy Structure in Channel
Authors: Zha You Qi , Zhong Chen Hua , Zhu Xiao Jun , Liu Kai
Published: June 2013

Air jet researchers want to improve the air jets (curtain) ability of cutting off heat exchange, dust and toxic substance diffusion. It is a natural idea to enhance the effect by two air jet flow. The motion model of the two jet flow is very complex and the final vibration mode corresponding to the different can smoke effect his paper designs a generator of two jet air. Acquiring the form, qualitative rules and the influence law of the two jet of eddy that the structure generates and simulates the vortex multi-scale simulation by FDS (Fire Dynamic Simulator) software, the quantitative relation based on the model and jet flow parameters. The law and the quantitative relationship could be used for fire safety designers.
The Research of the Servovalve Noise
Authors: Chen Yuan Zhang , Gong Da Ping
Published: June 2013

Use Gambit and Fluent to the servo valve armature component of squeak problem undertook CFD is analyzed, simulates the flow field distribution in internal circuit structure, found in the servo valve armature component whistle when fluid in the inner of the product, produced a marked a negative pressure zone, and in this context the armature assembly stress sharply change, causing the armature assembly vibration squeal, changing the internal structure of the product again CFD simulation, negative pressure area disappeared, the pressure change tends to be steady, the structure of the product was the actual through pressure liquid servo valve test, howling problem solved.
VDT and its Application to Container Loading Device
Authors: Zhan Jun Qing , Feng Xiao Mei , Li Li Shun
Published: June 2013

As the important content of modern design method, virtual design plays a key role in machine system optimal design. The VDT (Virtual Design Technology) is discussed in detail. The flow of virtual design is given. Based on the flow of virtual design, the application of virtual design to container loading device is studied.
Vibration Characteristics Analysis of a Pair of Aviation Herringbone Gears
Authors: Zhao Ning , Fu Chen Xi , Zhao Yong Zhi , Zhang Meng Qi
Published: June 2013

The lumped mass model of an aviation herringbone gear is established, which takes coupling relationship between the two helical gear into consideration. Based on this model, motional differential equation is derived, and excitation parameters of gear pair are calculated at the same time. The dynamic differential equations are solved to obtain the dynamic response of each degree of freedom, then vibration characteristics of aviation herringbone gear in different speed and power is analyzed and the appropriate rotational speed and power of different flight status is determined. Research on the reliability analysis of aviation herringbone gear and the dynamic efficiency analysis is of great significance.
A Comparison of Peer-to-Peer Simulator
Authors: Yan Li
Published: June 2013

P2P simulator has many basic characteristics such as pattern, P2P architecture supported, mode triggered, develop language and so on. As well as P2P simulators are assessed according to a number of criteria grouped under the headings simulator architecture, usability, scalability, Statistics, Underlying Network Simulation etc. As representative, five P2P simulators are compared in terms of the basic characteristic and the important criteria. A table is given about contrast of P2P simulators on basic characteristic and parameter of criteria. Consequently, supply right smart advantage for P2P researcher to select P2P simulator.
A New Improved Entropy Method and its Application in Power Quality Evaluation
Authors: Ouyang Sen , Liu Zi Wen , Li Qing , Shi Yi Li
Published: June 2013

This paper puts forward a new improved entropy method, which fixes the problem of traditional entropy weight method that entropy weights present the wrong message of entropy when all the entropy values are close to 1. The proposed method achieved efficient performance by designing calculation model of BP network. Firstly, the synthesis weights of power quality indexes were calculated by rank correlation analysis and the improved entropy method, which avoids the one-sidedness of subjective or objective. And the quantitative values of multi-index were obtained. Then a calculation model of BP network to realize this evaluation method is designed in this paper, making it more efficient and more practical. Finally, the evaluation of a power supply bureau has verified the effectiveness of the proposed method.
Calculation of Follower Displacement Error for a Translating Roller-Follower Plate Cam
Authors: Lin Jing
Published: June 2013

The relationship between the installment and machining errors and the follower displacement error for a translating roller follower plate cam was studied. The formulae of the follower displacement error were derived. These expressions can be used to calculate the follower displacement error. The follower displacement error of a translating roller follower cam system is closely related to the cam geometric error and offset distance error. By taking the values and signs of the cam geometric error and offset distance error properly, we can minimize the roller follower displacement error and design the high precision translating roller follower plate cam
The Eigenvalue Problem and Saint-Venant Decay Rate for a Nonhomogeneous Semi-Infinite Strip in Plane Strain
Authors: Yang Qing , Zhang Kai , Zheng Bai Lin , Zhu Jian Xin
Published: June 2013

The eigenvalue problem referring to a nonhomogeneous semi-infinite strip in plane strain is investigated here, by using the analogous methodology proposed by Papkovich and Fadle in homogeneous plane problem. Two types of nonhomogeneity are considered: (i) the modulus varies with the thickness coordinate exponentially, (ii) it varies with the length coordinate exponentially. The eigenvalues for these two cases are obtained by numerical calculation. By considering the smallest positive eigenvalue, the Saint-Venant Decay rate of the problem is estimated, which indicates material nonhomogeneity can have a significant influence on the Saint-Venant decay rate.
Theoretical Analysis & Experimental Research on Piezoelectric Vibration Feeder by Vertical Driving
Authors: Shen Yan Hu , Yang Zhi Gang , Liu Yong , Su Jiang
Published: June 2013

The Present Electromagnetic/piezoelectric Vibration Feeder can’t be Compressed along the Height Direction, and the Application is Limited because of the Small Assembly Area. Therefore, a New Structure Piezoelectric Vibration Feeder was Brought up in this Paper, which had Cirque Piezoelectric Vibrator for Vertical Driving, and the Dimension of the Height can be Reduced to below 30% of the Present Feeder. Based on the Structure Character of the Feeder, the Vibration Model was Built up, and the Calculation Method of the System Resonance Frequency, the Stiffness Matching Relationship of the Supporting Spring and Piezoelectric Vibrator were Confirmed through Theoretical Analysis and Experimental Research. Experiments were Done to the Prototypes, which Turned out that, under the Sine Voltage of 220V, the Feeder could have 0.5kg Stuff for Experiment (samples), which were Columns with Dimension Φ3mm×5mm, and the Feeding Speed can be up to 145mm/s. the Measured Resonance Frequency was 187Hz, which had High Coherency with Theoretical Calculation Value.
Color Features Description and Extraction of Flame Image Segmented Region of Early Fire in Large Space
Authors: Hu Ai Min
Published: June 2013

It is very important to detect the early fire in large space to protect human life and property security. In this paper, color features description and analysis of the segmented flame image are carried out to extract a varity of quantitative feature descriptors of flame region based on the detection results of flame video image. The experimental results show that the color features can improve the effectiveness and robustness of flame recognition system. Furthermore, it can reduce the false alarm rate in the fire recognition system.
Human Face Detection Method Based on Skin Color Model
Authors: Tang San
Published: June 2013

Face detection is the first step of face recognition, and is a very active research topic in the filed of computer vision and pattern recognition. A skin color model based face detection method for chromatic images is proposed in this paper. The H-CgCr skin color model is established by taking advantage of the color pixels clustering distribution in the HSV and YCgCr color space. The noises are eliminated based on skin color segmentation, and the face candidate region is judged according to knowledge-based, finally, the position of the face area is marked by the box. The experimental results demonstrate that the proposed method is feasible and effective.