bluuebunny/crossref_metadata_2025 huggingface dataset:
Research of Mining Subsided Land Reclamation System Based on GIS
Authors: Yang Da Bing , Zhang Wen Xin , Yao Qing
Published: October 2011

Land reclamation is an effective measure in recovering land resources, protecting ecological environment and solving the contradiction between people and land. This paper adopts ArcEngine, ArcSDE, Oracle, Micirosoft Visual C# and other technologies to develop mining subsided land reclamation system which integrates reclamation suitability evaluation model, ground deformation prediction model, land cube calculation model and economic evaluation model. The system realized the information and network management about mining subsided land, provided the functions such as map operation, ground deformation analysis, earth volume calculation, reclamation suitability evaluation and economic evaluation. It can be used to help decision maker choose and plan their activities more effectively and scientifically to match situation of land reclamation and ecological restoration.
A Successive Approximation Approach of Nonlinear Optimal Control with R-Rank Persistent Disturbances
Authors: Ma Shi Yong
Published: October 2011

A new feedforward and feedback optimal control law for a class of nonlinear systems with persistent disturbances is presented in this paper. By using a successive approximation approach (SAA), the original nonlinear optimal control problem is transformed into a sequence of nonhomogeneous linear two-point boundary value (TPBV) problems. The optimal control law obtained consists of analytical linear feedforward and feedback terms and a nonlinear compensation term which is the limit of the solution sequence for the adjoint vector differential equations. By using the finite-step iteration of nonlinear compensation sequence, we can obtain a feedforward and feedback suboptimal control law. A disturbance observer is designed to get a physically realizable controller. Simulation examples show the effectiveness of the approach.
Modeling of Dynamic Game-Based Route Guidance System
Authors: Wei Yun , Shao Qing , Han Yin
Published: October 2011

Route guidance process is the dynamic game-based process of traffic authority and users, users’ behavior is affected by the guidance information and it also affect guidance effect. On the basis of analysis of user equilibrium and system optimum, a game theory model between traffic authority and users is presented, and system optimum and user optimum guidance strategy are given. Simulation results show that: user optimum guidance strategy will bring oscillation of traffic flow, system optimum guidance strategy is optimal but difficult to achieve, and coordination of system optimum and user optimum is close to system optimum strategy.
The Influence of Modulation Voltage Flyback to LFMCW Radar’S Beat Signal
Authors: Leng Jian Wei , An Fei
Published: October 2011

This thesis focuses on the influence of VCO modulation voltage on LFMCW radar beat signal. Firstly, analysised the serious effect to beat signal spectrum caused by flyback voltage. Because of the false frequency component would be produced by voltage flyback. So that the radar measurement system can't be measured the correct distance information from the inaccurate peak detection. Thus, both digital signal processing and hardware produce synchronized signal are used to solve the bad influence by voltage flyback brought to LFMCW radar. Finally, compared the processing results with the null group, results shown that modulation voltage flyback would brought great difficulties on signal spectrum analysis, thus, the disturbance signal of flyback section should be processed during practice.
Study on Current Detecting and Control Method for STATCOM across Transformer
Authors: Wang Cun Ping , Yin Xiang Gen , Liu Jian , Xiong Qing
Published: October 2011

Static var compensator (STATCOM) is a widely used power electronic device for dynamic reactive power compensation, and its current detecting and control method generally adopts d-q decoupling method based on the synchronous rotating coordinate transformation. However, in the traditional method, the load reactive current component is directly used as the command of STATCOM output current, so it is required that the installation position of STATCOM must be consistent with load current detecting point. But in practice, STATCOM installation point and load current detecting point may be located at two different sides of the transformer. For this situation, this paper proposed an improved reactive current detecting and control method based on the principle of power balance, achieving the current detecting and control strategies when the two points are located at different sides of transformer. Finally, the simulation of system with STATCOM accessed from the third winding of transformer verifies the correctness and feasibility of the proposed method.
Acquisition of FDM Signal by Using Sound Card Based on LabVIEW
Authors: Yin Xiao Qi
Published: October 2011

Taking the computer sound card instead of current acquisition card as hardware and Labview as software development platform, a kind of sound card data acquisition system with higher sampling precision, middling sampling frequency and better flexibility is designed, it is given an example of six-path analog input multiplexing．It has realized data acquisition of multi-path FDM(frequence division multiplexing) signal. The system has many advantages, for example, high cost performance, strong commonality, and good expansibility．It takes on wider foreground in the fields of engineering measure and laboratory application．
Polarization Multiplexing, Angle Multiplexing and Circumrotation Multiplexing Holographic Recording Experiments with 3-Indoly-Benzylfulgimide/PMMA Film
Authors: Zong Zheng Yue , Menke Neimule , Yao Bao Li , Wang Ying Li , Chen Yi
Published: October 2011

Fulgide is well-known as a thermally irreversible organic photochromic compound. The fulgide films can be applied as recording materials in ordinary holography and polarization holography, which were respectively based on the photochromic and photoinduced anisotropy properties. In this report, different kinds of multiplexing holographic storage, like angle multiplexing, circumrotation multiplexing and polarization multiplexing are realized in a 3-indoly-benzylfulgimide/ PMMA film for the first time, where 5 images, 18 images and 2 images are stored at the same position of the film, and diffracted without crosstalk with each other. It is proved that 3-indoly-benzylfulgimide film has spatial resolution of 6300lines/mm, sensitivity of 2.89 × 10-3cm2/mJ at 632.8nm on the polarization direction of the exciting beam, fatigue resistance of 70 times, thermal stability of 14 months and has advantages like low cost, easy to used, rewritable, long life time at room temperature for both states, and high signal to noise ratio. Overall, 3-indoly-benzylfulgimide is a better rewritable holographic storage medium, but the fatigue resistance and thermal stability should be improved.
A USB Interface High-Speed Data Acquisition System
Authors: Cui Wei , Chen Lei , Li Xing Guang
Published: October 2011

A continuous-wave lidar signal acquisition system with USB2.0 interface is present，in this paper. The hardware and the application program has been designed, its sampling rate is up to 1000Msps by flywheel A/D circuit. The signal correlation and accumulation is processed by using FPGA with512M RAM .The experimental results show that it can be used in a variety of systems.
Design of AC Charging Point for Electric Vehicle
Authors: Ding Li Bo , Ma He Xiang , Zhang He
Published: October 2011

AC charging point is one of the main equipment of electric vehicle charging system. The design process of a kind of AC charging point, which is controlled by a Cortex-M3-based microprocessor and μC/OS_II-based management software, is discussed in this paper. Hardware structure and the design principle of each module are described in detail, as well as the important aspects of software design, such as the priority arrangement of tasks and interconnection between tasks. The AC charging point features friendly and easy-to-use user interface, accurate measurement and stable operation, and has obtained the certification from authority department.
The Method Based on Structural Evolution for Recovering Erosion Thickness
Authors: Jiang Su Hua , Zhou Hai Ting , Song Chuan Hui
Published: October 2011

A new way to recover the erosion thickness of polycycle basin accurately is introduced in this article，taking Kongdian formation of Jiyang depression in Bohai Bay Basin as an example. The Ek during paleogene period was denuded differently. As is lack of well data in deep zone，it is quite difficult to identify the stratas only by using seismic data. And the erosion thickness of Ek can not be recovered precisely by common methods. So a method based on structural evolution for recovering erosion thickness has been proposed. Divide areas of erosion by using structural evolution sections. Then based on part well data in main erosion area，the erosion amounts of local layers are calculated by means of the sedimentary rate，wave analysis and stratigraphic contrast methods. The result shows that：this method is more accurate than others，which can be used to recover the erosion thickness of the polycycle basin.
NC Machine Position Accuracy Testing and NC System Error Compensation Analysis
Authors: Zhang Ke , Cui Zheng Xing , Gai Li Ya , Ge Peng , Cai Dong Gao
Published: October 2011

NC machine plays an irreplaceable role in the modern manufacturing because of its high machining processing accuracy, quality stable, flexibility. Through using the Renishaw ML10 laser interferometer detect the positioning accuracy and repositioning accuracy of X axis and Z axis of the HTC20 series of NC machine tools. According to the detection result compensate NC system to meet the machining accuracy requirement. The result shows that the error compensation of NC system is a effective method to improve the position accuracy of NC machine.
The Preparation of pH- and Thermo-Sensitive Chitosan-Based Hydrogels by Michael-Type Addition Reaction
Authors: Wei Hong Liang , Ma Cun Cai , Chu Hui Juan , Zhu Jing
Published: October 2011

The hydrogels based on chitosan were prepared by Michael-type addition reaction between chitosan's primary amino groups and maleimide group terminating poly (ethylene glycol) (PEG) under mild conditions. The hydrogels were characterizatied by FTIR, TG, etc. The study on the swelling behavior indicated that the hydrogels possess pH-and thermo-sensitivity. The chitosan-based hydogels crosslinked by Michael-type addition reaction have a potential application on biomaterials due to its biodegradability, biocompatibility, less toxicity and hydrophilicity.
A Mobile Robot for Replacing Electric Vehicle Battery
Authors: Wang Xin , Zhao Jin Long , Lu Shou Yin , Tan Lin
Published: October 2011

This paper introduces a mobile robot developed for replacing battery of electric vehicle automatically and intelligently. The developed robot based on a modular concept has four different parts, including mechanical system, control system, detecting device and driving module. The mechanical system driven by AC servo motors and controlled by control system has four degrees of freedom, and adjusting movements are independent and accurate. All measures enhance its reliability and reduce the EV charging time. This paper introduces the different parts and advantages of this charging mechanism.
Application of Intelligent AutoCAD in Ultrasonic Inspection of the Welds
Authors: Cao Guo Qiang , Yao Lan , Dai Yi Tong
Published: October 2011

Ultrasonic flaw detection in weld inspection is commonly used in non-destructive testing methods. But when the ultrasonic inspection of the welds, point location of defects and identify need technical personnel calculation and according to their long-term practical experience, it requirement for inspection personnel has higher technology.And in ultrasonic weld inspection there will be some factors affecting the accuracy of positioning. It will lead to limitations of ultrasonic weld inspection. To solve these problems effectively, AutoCAD will be used in ultrasonic weld inspection.
Adaptive Servo Control Based on LQR for Flexible Master-Slave System
Authors: Jia Bai Long , Liu Ying , Kobayashi Yukinori
Published: October 2011

In this study, an adaptive servo controller based on LQR is designed for flexible master-slave system (FMSS). A dynamics model, observer and servo controller based on LQR is built respectively. According to the parameter sensitive experiments, adaptive servo controller based on LQR is designed. This research focuses on the performance of rapid response and vibration suppression. Experimental results indicate that adaptive servo controller, which suppresses the saturation of the input torque to ensure the stability, has achieved short time delay and adequate vibration suppression.
Auto Identification of Weld Seam’s Initial Position for Visual Servoing Weld Robot
Authors: Deng Yi Bo , Zhang Hua , Ma Guo Hong
Published: October 2011

During the practical researches and applications based on passive visual servo, weld torch was often moved to the weld seam initial position manually by human or by the means of accurate mounting devices, which will often cause low efficiency, as well as a increase in manufacturing cost. To solve this problem an algorithm was presented in this paper to identify the initial position of the Aluminum plate weld seam. It’s totally based on passive visual servo system without utilizing any auxiliary optical equipment. This algorithm combined a variety of DIP techniques and approaches, accurate initial position could be extracted successfully. More images were processed by this method to confirm the validity. With the realization of auto-identification precision of the weld jig can be reduced dramatically and the degree of the automation and flexibility can be improved greatly.
Design of the Android Platform Based Electronic-Device Monitoring Terminal
Authors: Wang Chao , Fu Zeng Zheng , Wang Peng Peng
Published: October 2011

This article introduces the Android Operating System based electric-device monitoring system, which includes a combination of device faults collection and real-time data uploading functions. Our new system comes equipped with an application for sending faulting pictures, GPS information, and short descriptions to a service center immediately via Gmail. In order to provide a user-friendly interface and guarantee the accuracy of data, the same-time reporting efficiency has been greatly improved. This article describes the process of how to complete the terminal design by using JAVA eclipse+XML. Flow charts of the program terminal and designs of primary modules are also provided.
Valve Control System of Oil Depot Based on AnyCAN5000
Authors: Li Yao Qiu , Wang Rui
Published: October 2011

With application of the embedded microcontroller technology into the valve control, the valve control system of oil depot is designed on the basis of embedded microcontroller AnyCAN5000. The system constitutes of host computer and slave computer, giving designs of hardware and software systems, which is characterized by low cost and high reliability, and with application of the technology in practice the valve control system can bring good effect and meet needs of control.
Real-Time Flame Simulation Based on Volume Rendering
Authors: Sun Jin Guang , Yang Xin Nian , Li Yang , Wang Jun Tao
Published: October 2011

Computer simulation of the flame is difficult to achieve real-time and realistic problem, proposing a fire simulation method based on fluid model and GPU general computing combining. The method is based on the incompressible flame, low-density, non-sticky and so on. Semi-Lagrange method is using to solve the fluid equations, using volume rendering based on 3D texture to rendering the flame. Then, using the method of energy-spectrum of radiation to control the color of the flame, and using the GPU to accelerate in parallel, balance realistic and real time.
Kinematics Simulation of Steel Tube Rotating Mechanism Based on ADAMS
Authors: Chai Fu Jun , Xu Jin You , Xu Ying
Published: October 2011

Taking a new steel tube rotating mechanism as the research object, the model is simplified and the virtual prototyping model of the mechanism is established. The mechanism kinematics simulation is carried out with ADAMS simulation software. The motion law and state in two conditions are comparatively analyzed. Analysis results show that, in steel tube clamping stage the motion of the clip rod is of variable deceleration; And in rotating stage, mechanism is of accelerated rotation with variable acceleration when the cylinder input, while mechanism is of uniform rotation when the crank input； And then the cylinder is with positive and reverse swings throughout the movement process. The analysis results provide the basis for institution parameter selection and structure optimization design.
The Application of Subsection Simpson Integration on Artillery Firing Efficiency Simulation Modeling
Authors: Zhao Zhi Qiang , Jiang Bo Chuan
Published: October 2011

The evaluation model of artillery firing efficiency is widely applied to firepower command&control and large-scale simulation, itis very important for improving precision and speed of calculation to enhance capability of firepower command&control and large-scale simulation. Two-dimensional subsection Simpson integration was introduced to evaluation the model, the analysis of two-dimensional subsection Simpson integration in theory showed that convergence speed of two-dimensional subsection Simpson integration enhance to O(h4). The simulation results indicate that, speed of two-dimensional subsection Simpson integration is higher 20 times than statistics experiment method, precision of two-dimensional subsection Simpson integration is a little higher than the typical numerical integration such as midpoint formula integration and statistical experiment method, but it can promotes precision by 10% than approximate computation method.
Observability Analysis for TDOA Passive Localization System
Authors: Gu Xiao Jie , Wang Xin Min , Li Wen Chao
Published: October 2011

Observability in passive location and tracking system is an important problem. This paper investigates the observability of multi-station time difference measurements system. For a 2D plane N orders movement target, three algorithms, linear system theory, nonlinear system theory and algebraic equations are used to demonstrate the observability of multi-station time difference of arrivals (TDOA) passive location and tracking system. The minimum of observation station and observation number are obtained when the targets are observability.
Robust Optimization Design on Vehicle Divided Steering Linkage
Authors: Zhu Hua , Zhang Yong
Published: October 2011

In view of the great fluctuation on objective functions which cause constraints dissatisfied, robust design is applied to the vehicle divided steering linkage optimization problem. A robust model is established by considering the kinematic pair clearance and structural error both in the objective functions and constrains. Optimum results show that,the design method can effectively guarantee the kinematics precision of steering mechanism and the transmission stability.
Open-Loop Speed Loss Compensation Method and Simulation Analysis under Variable Load
Authors: Peng Tian Hao , Yue Nan Geng , Liu Jia Dong , Yang Mei Sheng
Published: October 2011

This paper analyzed the reasons of motor speed loss under variable load in variable-speed pump-control-motor governing system, and pointed out that oil compressibility caused by load change is one of the reasons. Speed drop compensation coefficients ware derived, and the compensation method under variable load in variable-speed pump-control-motor governing system was built. The simulation results show that the compensation method can well compensate motor speed loss in variable load.
Numerical Simulation and Application of Gas Flow Distribution of ESP Transformed to Baghouse in Cement Kiln Head
Authors: Dang Xiao Qing , Hu Hong Sheng , Min Pang
Published: October 2011

By using Computational Fluid Dynamics (CFD) method,numerical simulation of gas flow distribution of ESP transform to baghouse in cement kiln head of 6000 t/d production. Through numerically simulation,air volume of every filter bag cell and head-on gas flow velocity distribution of filter bag were displayed. By adjusting the configuration parameter of the gas flow distribution device during the numerical simulation, it gives the result that the manner of installing gas flow distribution device, when the windage of the air volume of every filter bag cell is not more than 5% and the press drop of the dust collector with clean filter bag is 300 Pa. The calculated results showed good agreement with the measured results in the field. The simulation results were carried out by transformation. The dust emission concentration of precipitator is 26.6 mg/m3, and the dust running resistance is less than 1000Pa, can achieve the performance assessment requirements.
The Experimental Investigation of Energy Transfer in Wall Turbulence Based on Wavelet Transform and FFT and HHT
Authors: Jin X. Q. , Xia Z.Y.
Published: October 2011

Using constant temperature hot-wire anemometer IFA300, we measured the wall turbulence on different normal location of the boundary layer in the wind tunnel experiment section. The wind tunnel is of low turbulence intensity. We have applied Fourier transform, Wavelet transform and Hilbert-Huang transform to analyze the turbulent fluctuating velocity obtained by measurement and have compared turbulent energy transfer law in different wall distance. This article quantitatively analyzed on the eddy motion process for different wall distance in wall turbulence from the energy point of view. It also discussed the energy transfer law based on eddy combination theory and the inertial sub-range.
No-Load Analysis of Permanent Magnet Spring Nonlinear Resonant Generator for Human Motion Energy Harvesting
Authors: Sun Kai , Liu Guo Qiang , Xu Xiao Yu
Published: October 2011

With the structure of permanent magnet (PM) spring, composed of one fixed end magnet and one moving magnet, a nonlinear resonant electromagnetic generator is designed for harvesting energy from human wrist by vertical shaking, which can be used as an emergency power source for portable electronic products, such as cell phone. The magnetic field distribution is analyzed by finite element method (FEM). Generator model is built under no-load condition and the parasitic damping factor is evaluated indirectly. The model is amended through reasonable hypothesis of collision and validated by the measured results, which can be used for further with-load analysis and generator optimization.
A New Image Affine-Invariant Region Detector and Descriptor
Authors: Chen Xiu Xin , Jia Ke Bin , Yu Chong Chong , Wei Shiang
Published: October 2011

To solve the problems that exist in present affine-invariant region detection and description methods, a new affine-invariant region detector and descriptor are proposed in this paper. First, affine-invariant regions in an image are detected using a connected-region based method. And then a vector composed of a group of affine invariant moments is adopted to descript the regions. Experiments show the effectiveness and robustness of the method. It is also very fast.
Performing Calculation in Interactive Theorem Proving
Authors: Li Bing , Zhao Chen Yang , Li Lian
Published: October 2011

An LCF style tactic can be used to verify that the conclusion is a logical consequence of the premises, however, in mathematical practice, we often construct a conclusion in a proof step. This paper proposes a calculational style of tactic, and illustrates the characteristic and the realization issues of the tactics on the top of a theorem prover.
Interference Suppression Detection Algorithms in STBC-MIMO Systems
Authors: Wang Yan Li
Published: October 2011

Aiming at the uplink multi-user STBC-MIMO system, we adopted the combination of the detection scheme about the linear MMSE interference suppression and symbol estimation, and the receiver maintained decoding simplicity. Theory analysis and simulation results reveal that the proposed scheme can suppress and cancel the interference from co-channel users effectively without increasing the complexity significantly.
Performance Comparison of LS and LMMSE Channel Estimation Algorithm for CO-OFDM System
Authors: Tong Zheng Rong , Guo Min Jie , Yang Xiu Feng , Zhang Wei Hua
Published: October 2011

The CO-OFDM single-mode optical fiber system is constructed by the Matlab coupled with the Optisystem. And the influence of different channel algorithm on the receiver of system is researched. The simulation results show that the system performance is improved by using LS or LMMSE channel algorithm. And the LMMSE channel algorithm can provide better performance than the LS channel algorithm. Compared with LS algorithm, the required receiver OSNR is reduced by about 1 dB using improved LMMSE algorithm at bit-error-rate (BER) =10-4 in the CO-OFDM single-mode optical fiber system.
A New Method for Improving Infrared Image Quality and its System Implementation
Authors: Huan Zhan Hua , Yang He Meng , Zhu Meng
Published: October 2011

To obtain high-quality infrared image real-timely, a new correction enhancement method is proposed. The method can both compensate nonuniformity of IRFPA by using calibration-based piecewise polynomial interpolation correction algorithm and increase image contrast by using histogram-based adaptive threshold image enhancement algorithm. The experiment is performed by carrying out the method in an embedded imaging system. The results show that the system can process infrared image real-timely and the processed image is clear with high signal to noise ratio.
Generalized Polar Decompositions in Matrix Exponential
Authors: Tian Yi Min , Zhang Ao
Published: October 2011

Matrix exponential computstion is a difficulty thing when the order of the matrix get big and big after discretion. When we use Lie group method to get numeric solution of a differential equation, we often face this problem.Li group method is a kind of prosperous method, its basic ideas is to keep the numeric solution in a manifold which is less than the Euclid space while bigger than the analytic solution manifold, so we can get more exact numeric solution than other method. So we discussed the generalized polar decompositions method for matrix exponential.
A Kind of Improved PEG Algorithm of Q-Ary LDPC Codes
Authors: Tong Ning Ning , Zhao Dan Feng , Wu Yu Ping
Published: October 2011

Progressive-edge-growth (PEG) algorithm is one of the best known methods for constructing LDPC codes at short and intermediate block lengths, however, the codes directly designed by such algorithm has high encoding complexity, especially for q-ary LDPC codes, encoding complexity increases with the increase of q value rapidly, which hinder the development of q-ary LDPC code’s implementation seriously. To such problem, the paper presents a improved method based on PEG algorithm which can be encoded by the iterative encoding algorithm with the liner operation complexity. The simulation results indicate: Though the error correcting capability of irregular q-ary LDPC codes constructed by the proposed methods in the paper is basically identical with the codes constructed by the PEG algorithm, but the powerful advantage makes it be easily implemented by the hardware .
Vision-Based Aerial Refueling Docking Based on SURF Algorithm
Authors: Qin Si Yuan , Yan Jian Guo
Published: October 2011

For the Boom and Receptacle Air Refueling, in order to locate the spatial position of the refueling receptacle, an object locating method is developed based on Speeded-up Robust Feature (SURF) algorithm. Firstly, SURF feature vector matching algorithm is used to detect and collect suitable SURF feature points in left and right images produced by binocular stereo vision system separately. Then the point that shows the same spatial position in both left and right images can be located through process such as deleting wrong matching points and calculating the image coordinate of the target point. Finally, the three-dimensional coordinates of the target points could be rebuilt in the camera’s coordinate system. According to the results of experiments, this method has good robustness and practicability.
The Combined Effects of the Environment and Sliding on the Pd-Ni Plated Connector Materials
Authors: Zhi Gang Kong , Liang Jun Xu
Published: October 2011

Usually there is a sliding between the contact surfaces of the connector, while the changes in temperature and humidity environment would affect the resistance of the connector contact materials. This paper studies the complicated effects of environment and sliding on the dynamic resistance of the contacts materials of Pd-Ni plated. Series of inspections and analytical research methods are introduced in this article. The surface morphology of specimens after damp heat cyclic test is observed by stereoscopic microscope and scanning electron microscope (SEM). Chemical constitution was examined by X-ray energy spectrum. The contact resistances were measured under the conditions of damp heat cycle by four-point method. The results show that the temperature and humidity environment and sliding has a more complex and significant impact on the performance of the contact materials than single-factors, and the tests are closer to the real working environment.
Analysis on Stress and Deformation of Low Elastic Modulus Concrete Cutoff Wall inside the Dam Body
Authors: Mou Ru , Xu Chang Jie , Ma Xiao Hua
Published: October 2011

Based on the simulation of a low elastic modulus concrete cutoff wall, the effect of dam constitutive model, elastic modulus of cutoff wall, the height of dam on the stress and deformation of the cut off wall is analyzed systematically. A critical value of cutoff wall’s elastic modulus values is proposed, when the elastic modulus overruns the value, the stress of wall increases fast, while almost no change when the elastic modulus is lower than the value. By comparing the sensitivity of cut off wall’s stress and deformation to the change of wall’s elastic modulus and dam’s elastic modulus, the effect of reducing the wall’s elastic modulus on the stress and deformation of wall is proved to be better than the way of enhancing the dam’s elastic modulus. Meanwhile by comparing the results between 2-dimensional model and 3-dimensional model, 2-dimensional model is proved to be only suitable for the analysis of middle section of the dam, while 3-dimensional model is suitable for the whole section, including the edge part.
Automatic Thermal Expansion Compensation of the Precise Grinding Machine AMB Spindle
Authors: Li De Guang , Liu Shu Qin , Bian Bin
Published: October 2011

Thermal expansion of the magnetic bearings in the process of precise grinding will lead to the posture drift of the grinding head, which can seriously affect the precision of the grinding. In this paper, the module of the relationship between temperature rise and the spindle posture is established, and the relationship between the controller’s five reference inputs and the spindle posture is ascertained. The controller’s five reference inputs are corrected according to the sample value of the temperatures in the system, so the inline adjustment of the grinding head posture and the automatic thermal expansion compensation of the system can be realized. Experiment proved that this algorithm could successfully compensate the thermal expansion of the AMB spindle.
A Research for Broadband Modeling Method of Electro-Absorption Modulator
Authors: Wu Jian , Zhao Qian
Published: October 2011

This paper improves the broadband equivalent circuit model (ECM) modeling method of Electro-absorption Modulator. According to the principle of Circuit Partitioning Simplified, the series form of the original increased frequency impedance model is transformed into the parallel form. The result shows that the new method eliminates the process of the impedance type verification, will not introduce new nodes, and reduces the computation. After testing, the maximum relative error of this model to fit measurement data is only 0.693%. This method’s simulation results are consistent with the test data of ECM better in 0-8GHz frequency range.
Design of C-Band Wideband Sweep Frequency Source
Authors: Liu Jia Qi , Tian Ling , Hong Wei , Zhang Jian Ye
Published: October 2011

This paper presents the design and fabrication of a compact 4-8GHz sweep frequency source at C-band with a hybrid frequency synthesizer technology. With DDS used as PLL’s reference, the frequency step size is as small as 3×10-4 Hz and the measured 1 kHz offset phase noise is-91.79dBc/Hz at 4GHz. This frequency sweep source has advantages of wide bandwidth, low phase noise, small frequency step size, low spurious, fast tuning speed, small size and low power consumption. So it is suitable for wireless hand-held test equipment and communication equipment.
Thread-Piezoelectric-Substrate Based Low-Cost Microfluidic Device
Authors: Zhang An Liang , Han Qin Jiang
Published: October 2011

A new low cost microfluidic device has been designed and fabricated. Three thread microchannels were fabricated using tape and three indicting filter papers were also made by dipping three filter papers into sodium nitrite with different concentration. The side of the thread microchannels was connected to the indicting filter papers and then mounted on a 1280yx-LiNbO3piezoelectric substrate, on which an interdigital transducer and reflector were fabricated using microeletric technology. PDMS film was coated to avoid the evaporation of microfluid transporting in the thread based microchannels. When a 25.5MHz RF signal with 25.4dBm power was applied on the IDT, the microfluid on the piezoelectric substrate was actuated by surface acoustic wave and transported along the thread microchannels, and reacted with nitrite ion in the indicting filter paper. Experimental results show that the thread-piezoelectric substrate microfluidic device can be used for biological or chemical analysis.
Design of Control System for Micro Tracklayer Based on μc/os-Ⅱ
Authors: Wei Jin Song , Gao Feng Qi , Wang Guang Long
Published: October 2011

A kind of control system which consists of high performance ARM microprocessor and embedded real-time operate system is put forward and researcheed. The control object and the requirements of system are analyzed; the general design project is determined; the control arithmetic and software structure are introduced in the end. ARM microprocessor is the intelligent core of the system. Matched with μCOS-II RTOS and application program, the system can complete the functions of information collection and real-time control.
213 W 500 Mhz 4H-SiC Static Induction Transistor
Authors: Chen Gang , Wu Peng , Bai Song , Li Zhe Yang , Li Yun , Ni Wei Jiang , Li Yu Zhu
Published: October 2011

. Silicon carbide (SiC) SITs were fabricated using home-grown epi structures. The gate is a recessed gate - bottom contact (RG - B). We designed that the mesa space 2.7μm and the gate channel is 1.2μm. One cell has 400 source fingers and each source finger width is 100μm. 1mm SiC SIT yielded a current density of 123mA/mm of drain current at a drain voltage of 20V. A maximum current density of 150 mA/mm was achieved with Vd=40V. The device blocking voltage with a gate bias of-16 V was 200 V. Packaged 24-cm devices were evaluated using amplifier circuits designed for class AB operations. A total power output in excess of 213 W was obtained with a power density of 8.5 W/cm and gain of 8.5 dB at 500 MHz under pulse operation.
The Application Design of the Heating Boiler System
Authors: Zhao Gang , Xu Jie
Published: October 2011

This paper introduces the design of a heating boiler control system based on PLC and IFIX. In this system, combining Premium PLC with IFIX4.5, industry Ethernet TCP/IP protocol communication is adopted to constructer the monitoring system of heating boiler though PLC and PC. Unity4.0 is used to design the ladder diagrams for the coal burning boiler to automatically realize burning process control and hearth pressure adjustment. IFIX4.5 is adopted to develop supervision control programs, which have perfect function, handy operation, fine visualization and strong man-machine interface.
Study on AGC Control System of 300 Reversible Cold Strip Mill
Authors: Liu Tao , Wang Yi Qun , Xue Zi Gong
Published: October 2011

In allusion to 300 Reversible cold mill, the composing and the theory of the auto gauge control system is presented. To meet the characteristic of the 300 reversible cold mill, the PID algorithm With Variable Integral Action is used in position and pressure inner loop control of press down hydraulic cylinder to elevate the response characteristic, and the dynamic press compensating algorithm is used in the gauge control outer loop to elevate the precision of strip thickness, and the stability of rolling process. Fig.1. 300 cold roling mill1 Introduction
Application of ARM in BLDCM Control System
Authors: Zhang Wu , Xu Xiao , Ying Xiao Yi
Published: October 2011

According to the control characteristics of brushless DC motor, a control system based on the LPC1700 ARM is designed, together with the corresponding external circuit. This system fully utilizes the high-performance 32-bit calculation of ARM chips and abundant hardware resources. It is compact in structure, reliable in operation and superior in speed regulation performance.
An Application of Machine Vision in Automatic Mobile-Phone Lens Assembly Equipment
Authors: Zhang Jian Zhong , He Yong Yi , Li Jun
Published: October 2011

In order to assemble mobile-phone more automatically,with higher speed,and with better efficiency, an application of machine vision in mobile-phone lens assembling guiding system is introduced in this paper. By introducing machine vision,experiment equipment is designed to learn the performance of this technology and the feasibility of this application.Experiment was conducted and the experiment results show that machine vision is a new-born technology which is characterized by automation, high accuracy, flexibility and expansibility on functions.Finally,machine vision can effectively solve some problems in traditional industrial automatic equipment,and the future application prospects of this technology are prosperous.
Numerical Simulation of Flow in a Horizontal Sedimentation Tank
Authors: Wei W.L. , Pei Zhang , Liu Y.L.
Published: October 2011

In this paper, we use two-phase mixture model and the Realizable k-ε turbulence model to numerically simulate the advection secondary flow in a sedimentation tank. The PISO algorithm is used to decouple velocity and pressure. The comparisons between the measured and computed data are in good agreement, which indicates that the model can fully simulate the flow field in a sedimentation tank.
CFD Simulation of Two-Phase Flow in a Downhole Venturi Meter
Authors: Feng Ding , Huang Si , Guan Yu Hui , Ma Wei Guo
Published: October 2011

This work performs an oil-water two-phase flow simulation in a downhole Venturi meter to investigate the flow field and pressure characteristics with different flow and oil-water ratios. The relation between the pressure drop and the feed flow rate in the flowmeter is investigated for its optimal design.
Numerical Analysis for Twin Screw Pump Internal Flow
Authors: Tang Qian , Misganaw Abebe , Ye Xian Zhi , Zhang Yuan Xun
Published: October 2011

Screw pump is a special type of rotary positive displacement pump in which the flow through the pumping elements is truly axial. The objective of this study is to develop a numerical solution method for flow analysis of a twin screw pump by using a Single Rotating Reference Frame method with various boundary conditions and rotational speeds of rotor on steady state condition. Flow variable contours and plots were obtained for fluid flow inside a pump subject to pressure inlet and pressure outlet conditions using the numerical control volume method in the commercial package of FLUENT. This work needs for the analysis of flow parameters inside a screw pump in order to achieve optimum design.
The Research of Automatically Determine the Feature Information of Radiation Emission Test Curve
Authors: Li Xiao Jian , Dai Fei , Xu Jian , Su Dong Lin
Published: October 2011

The feature points of test curve reflect important information of the equipment under test. The feature points are important for test report. Previous method of artificial selecting points is well targeted. However, it is low efficiency and subjectivity. A method to safe people from colossal data selection is long-cherished wish to all operators. The proposed algorithm in this paper can simulate the artificial process of feature information extraction and adjust the size of selected features according to the needs of the user. At least 100 times efficiency will be increase than artificial process.
Security Risk Analysis of Nuclear Power Plants Based on Fuzzy Comprehensive Evaluation
Authors: Xie Chuan Sheng , Hua Sheng Ping , Dong Da Peng , Jia Xiao Xi
Published: October 2011

A fuzzy comprehensive evaluation method for nuclear power plants is introduced in this article. First, a risk index system is established of which these indicators will be explained accordingly latter. Then, an evaluation set is constructed, and the weight of each index and corresponding membership is determined according to suggestions of experts and membership function to make evaluation level by level ，until a final comprehensive evaluation is obtained. This method is not very objective but simple and available.
Sensitivity Analysis of Ballistics Performance with Respect to Statistical Design Parameters
Authors: Liu Chang Qing , Luo Wen Cai
Published: October 2011

To investigate the effect of design parameters with statistical characteristics on ballistics performance, sensitivity analysis of the flight range objective with respect to relevant parameters was conducted to demonstrate it. Statistical parameters were modeled using an iterative method in order to determine descriptive statistics for further sampling. Simulation of flight range based on a dynamics model was then carried out. Finally, sensitivity derivatives from the baseline design scheme were calculated to locate the most sensitive parameters which can be controlled specially for better performance. Results show that by sensitivity analysis, thrust parameters affect the flight range objective obviously while others not, which provides suggestions about whether some parameters should be limited in a range or not.
Dynamic Modeling of the Variable Rope Length 3D Crane System of a Bridge Crane
Authors: Dai Shi Jie , Cheng Yan Yan , Pei Peng , Ren Ming Ming , Lv Zhi
Published: October 2011

In this paper, a 3D crane system coordinate system is established for a bridge crane in which the rope length is always changing. The position of the grab in the coordinate system is selected as control objectives, while the cable-car displacements and length of the rope are selected as control variables. Lagrange equations are used for the dynamic analysis. A simulation is conducted in MATLAB environment to analyses the angular motion of the rope caused by its length change and the linear motion of the cable-car.
Performance Analysis of Existing 600MW Coal-Fired Power Plant with MEA-Based CO2 Capture
Authors: Xu Gang , Li Shou Cheng , Yuan Xing , Yang Yong Ping , Song Xiao Na
Published: October 2011

This paper presents the techno-economic performance of 600 MW coal-fired power plant with and without MEA-based CO2 capture process, based on the operating data of an existing power plant. The simulation and analysis are based on ASPEN PLUS, with fully consideration of features of existing coal-fired power plants and the integration of CO2 capture process with steam cycle. The results show that, when adopting CO2 capture process, the plant efficiency will decrease significantly. And the cost for electricity will increase dramatically. Through further system integrated optimization, the efficiency fall from 40.28% to 29.61%, which is still tremendous but obviously better performance than before.
A Shot Boundary Detection Method Based on PSO-SVM
Authors: Zhao Long , Sun Xue Mei , Zhang Ming Wei
Published: October 2011

Shot boundary detection (SBD) is the first step which segments video data into elementary shots for content-based video retrieval. In this paper, a shot boundary detection algorithm based on support vector machine (SVM) and particle swarm optimization (PSO) is proposed. First of all, the extracted features of pixel domain and compressed domain are combined to form a multi-dimension feature vector by using the scheme of sliding window. Next, particle swarm optimization with global search capacity is adopted to seek the approximately optimal parameters of radial basis function of SVM. Finally the model trained by the parameters obtained is applied to judge and categorize the frames into cut transitions, gradual transitions and non-transitions. The experimental results on the TREC video set 2001 demonstrate our algorithm is efficient and robust, and it solves the difficulty in parameter selection of SVM well.
Research on Reliability Evaluation Based on Monte Carlo Method
Authors: Li Xiang Ning , Wu Fu Qiang , Sun Xiao Feng
Published: October 2011

This paper presents a Monte Carlo numeric simulation method application in reliability evaluation of exponential distribution. This method resolves reliability evaluation problem when test fault is zero. An example is given to illustrate this method is reliable and the result is reasonable.
Online Fatigue and Creep Monitoring System for 2-D Axis-Symmetry Components in Power Plants
Authors: Zhang Heng Liang , Xie Dan Mei , Nie Chu , Xiong Yang Heng
Published: October 2011

This paper presents a system developed for online monitoring of various aging effects, such as fatigue, creep and fatigue–creep interaction. An appropriate life prediction methodology has been used to address the various aspects of creep, fatigue and creep fatigue interaction, creep and fatigue crack growth. The system converts the plant transients to temperature and stress responses using the analytical models modified by FEM. The fatigue usage factor is computed using the rainﬂow cycle counting algorithm. The creep damage index is evaluated from the computed temperature and stress histories and the material creep rupture curve. This system has already been installed at Henan Jiaozuo power plant in china for monitoring the fatigue and creep degradation.
Dynamic Response of Cantilever FGM Cylindrical Shell
Authors: Hao Yu Xin , Zhang Wei , Yang L. , Wang J.H.
Published: October 2011

An analysis on the nonlinear dynamics of a cantilever functionally graded materials (FGM) cylindrical shell subjected to the transversal excitation is presented in thermal environment.Material properties are assumed to be temperature-dependent. Based on the Reddy’s first-order shell theory,the nonlinear governing equations of motion for the FGM cylindrical shell are derived using the Hamilton’s principle. The Galerkin’s method is utilized to discretize the governing partial equations to a two-degree-of-freedom nonlinear system including the quadratic and cubic nonlinear terms under combined external excitations. It is our desirable to choose a suitable mode function to satisfy the first two modes of transverse nonlinear oscillations and the boundary conditions for the cantilever FGM cylindrical shell. Numerical method is used to find that in the case of non-internal resonance the transverse amplitude are decreased by increasing the volume fraction index N.