bluuebunny/crossref_metadata_2025 huggingface dataset:
Numerical Study on Aerodynamic Performances of CRH3 under Crosswind
Authors: Su Hong Yuan , Li Ming , Wang Dong Ping , Liu Feng
Published: November 2012

Based on 3D steady and incompressible Navier-Stokes equation and standard k-ε turbulent model, numerical calculation for the aerodynamic properties of EMU (Electric Multiple Units) CRH3 (China Railway High-Speed 3)running in crosswind were carried out by finite volume method. Aerodynamic performances of EMU CRH3 were analyzed and compared, when the EMU was running in different speed and under the crosswinds of different velocity. The research showed that with the change of speed of train and crosswind, the surface pressure and aerodynamic forces altered according to a certain rule. Compared with the drag, the change of lift and lateral force caused by the increase of crosswind were more serious. When the speed of train was constant of 200km/h, 250km/h and 300km/h, the drag of train increased by 26.7%, 20.4% and 19.8% respectively as the speed of crosswind increased from 12.5m/s to 30m/s, the lift of train increased by 340.7%, 331.7% and 337.1% respectively, and the lateral force of train increases by 296.3%, 266.0% and 150.2% respectively. As the speed of crosswind increases, the increase of drag caused by the acceleration of train is more serious than lift and lateral force.
Parametric Analysis of the Dynamic Response of Hot-Rolled H-Shaped Steel Beam under Lateral Impact Load
Authors: Pei Chang , Wang Rui
Published: November 2012

The analysis on the basic mechanical properties of hot-rolled H-shaped steel beam under lateral impact load was done by use of ABAQUS. The reliability of the FEA model was verified through comparing with the existing experiment of H-shaped steel beam subjected to lateral impact. And then, this FEA model was used to research the dynamic response of the H-shaped steel beam subjected to lateral impact. The main parameters include the impact energy, mass and impact velocity of the impact hammer. The results indicate that the finite element analysis model built in this paper could accurately simulate the process of hot-rolled H-shaped steel beam under lateral impact load and the impact energy, mass and impact velocity have different influences on the dynamic response of H-shaped steel beam.
The Modeling and Experimental Verification of a Servo-Proportional Valve
Authors: Fang Jin Hui , Kong Xiao Wu , Zhu Xu , Wei Jian Hua
Published: November 2012

The present work deals with a method for the modeling of a three-way servo-proportional valve actuated by a proportional solenoid. The model incorporates the primary nonlinear phenomenon exist in the solenoid, such as the hysteresis, nonlinear inductance and counter-electromotive force. Two ways are employed to simplify the model for the purpose of controller design. Firstly, the relations of current supply vs. flux linkage and flux linkage vs. electromagnetic force under different displacements of armature are captured by curve fitting and interpolation, with the advantage of keeping the nonlinear characteristics. Then the linearization method around the null-position of the spool is implemented, where the solenoid is modeled as a 1-order system, and the body of valve is treated as mass-spring 2-order system. Then the test-bed for the identification of main parameters and verification of the model is designed. The parameters are obtained from the experimental results where the armature and spool are locked at different positions. Finally, the model is verified as the dynamic responses of current supply and displacement of spool obtained from the simulation model agree well with the experimental results when the armature and spool are unlocked.
MEMS Gyro Random Drift Model Parameter Identification Based on Two-Stage Recursive Least Squares Method
Authors: Liu Zhao Hua , Chen Jia Bin , Mao Yu Liang , Song Chun Lei
Published: November 2012

Autoregressive moving average model (ARMA) was usually used for gyro random drift modeling. Because gyro random drift was a non-stationary, weak non-linear and time-variant random signal, model parameters were random and time-variant, too. For improving precision of gyro and reducing effects of random drift, this paper adopted two-stage recursive least squares method for ARMA parameter estimation. This method overcame the shortcomings of the conventional recursive extended least squares (RELS) algorithm. At the same time, the forgetting factor was introduced to adapt the model parameters change. The simulation experimental results showed that this method is effective.
Study of the Multi-Axis Motion Controller Based on DSP
Authors: Jia Jia , Cao Shu Kun , Yang Shang Wei
Published: November 2012

According to the development and current situation of DSP (Digital Signal Processing) at home and abroad, using high-speed computation ability and rich resources of TMS320F28335 chip to achieve higher real-time demand motion control in numerical control system (linear interpolation, continuous interpolation, position control, Serial communication, etc). On that basis, this paper discusses realization of hardware and software design method of this controller. Such movement controller has the perfect function and excellent performance, it often provides the multi-axis motion coordination control on the plate, and has higher control precision.
Binocular Vision-Based Measurement for Motion Parameters of Rocket Nozzle
Authors: Guo Yu Bo , Ye Dong , Chen Gang , Yuan Feng
Published: November 2012

This article presents a real-time measurement method for the motion parameters of rocket nozzle by means of binocular vision and rocket nozzle rotation axes. With preprocessing, this method defines the rotation transformation relation between world coordinate system and fixed nozzle coordinate system by measuring the position of two nozzle rotation axes in world coordinate system based on binocular vision. During real-time measurement, the nozzle motion parameters can be measured with transformation of marker coordinate from world coordinate system to fixed nozzle coordinate system. This method overcomes the disadvantages of existing method, such as larger measurement error of motion parameters, more markers and single-dimension measurement. The experiment results verified this method and show that it can achieve higher measurement accuracy.
Location System for Micro Medical Device inside Human Body Based on Packet Error Rate Analysis of ZigBee
Authors: Wei Chun Hua , Wang Jin Hai , Zheng Yu
Published: November 2012

For determine the location of the ingestible electronic pill inside the human body ，a new positioning system of the micro medical device inside the human body is designed. CC2430 communication chips combined with ZigBee protocol software are used as radio frequency transceiver of the system. When transmission power is very low, significant error codes will be generated at the receiving terminal. We can locate the electronic pill according to the analysis results of the packet error rate. And we adopt Trilateration to build up a set of nonlinear equations, which is related to the inter-node distance and spatial location variables of the pill. At last, equations are solved with numerical solution. It is found that the method is feasible.
Research on the Intelligent Tracking Control System for SPBP
Authors: Qin Yan , Guo Ya Qin , Li Zhong Nian , Yue Yun Feng , Zhou Xin
Published: November 2012

Abstract. This paper proposed the PLC (Programmable Logic Controller) for the control of nuclear fusion, fuzzy control technology, PWM (Pulse Width Modulation) control method, to SPBP (Solar Photovoltaic Battery Plate) for intelligent control, the SPBP in photovoltaic power generation process," always and automatically tracking the strongest solar radiation", full" PV" role, so as to achieve the best effect of power generation of the research methods and technical route. The design for the modern SPBP intelligent" tracking" control system provides a novel and practical design case. Experimental results show that this control system, the design scheme is correct and feasible, and the performance-price ratio is very high.
Street Light Monitoring Systerm Based on Zigbee and AC Chopper Technology
Authors: Wang Chun Jie , Zhang Hui Xia
Published: November 2012

A design of street Light monitoring system is put forward in this paper, which is based on Zigbee and AC chopper technology. In this design, the wireless network control can be realized for single light and the lights of any combination, the remote monitoring can be achieved by means of the upper computer software, and the extremely energy-saving can also come true in according to the AC chopper technology.
PD-Type ILC Algorithm Research with Forgetting Factor for a Class of Linear Systems with Multiple Time Delays
Authors: Yang Hong , Li Sheng Ming
Published: November 2012

Based on iterative learning control (ILC) algorithm with forgetting factor, the thought that the forgetting factor is a function of iteration numbers is proposed in this paper, which has simplified the convergence conditions. And the convergence analysis is given. Then, the study results of this paper are applied to a class of linear systems with multiple time delays and simulation results show that, under the improvements of the convergence conditions and the reasonable choice of forgetting factor function, the PD-type iterative learning control algorithm with forgetting factor applied to the linear systems with multiple time delays in this paper has effectiveness and superiority.
Target Recognition and Features ExtractionBased on ROI and SIFT Descriptors
Authors: Ma Jing , Li Yuan , Wang Qing Lin
Published: November 2012

This paper presents a target recognition method based on SIFT features matching and image ROI technology for vision system of assembly robots. In order to accelerate target recognition method, color histogram is used to detect the region of interest in images, then SIFT algorithm is employed in the ROI to extract the features. Thereby, the image Gaussian pyramid structure is simplified and the computation cost is reduced significantly. The experimental results show that this method can quickly recognize the objects without the loss of robustness and accuracy, and can provide necessary visual feedback information for assembly robots in approaching and operating task.
Design and Simulation of Soccer Robots and Field Scenarios
Authors: Yu Jun , Hu Zhi Yi
Published: November 2012

RoboCup is an international joint project to promote artificial intelligence, robotics and related fields. This paper presents a program that can draw and edit a drawing about soccer Robots and field scenarios. The program can load and save an image file, and draw 2D primitives in a painting area. These primitives can be set with different heights and tested by their compatibility with a new primitive. It also can undo/redo a drawing operation. There is a grid function to simplify the positioning of primitives. All the shapes in the drawing can be aligned appropriately. The result shows that the program can meet the basic requirement.
The Analysis of the Grid-Connected Phase-Locked Loop Technologies Based on the Transformation of Coordinate System
Authors: Yang Guo Tao , Sun Zhi Yi , Liu Li Qun
Published: November 2012

In order to gain the same amplitude、frequency and phase between the output voltage of the inverter and the grid voltage, the phase-locked loop (PLL) technology is widely used in grid-connected photovoltaic (PV) generating system, which is normally used to obtain instantaneous phase information to achieve the grid-connected purpose of PV inverter. The detective accuracy of frequency and phase of the grid voltage is directly affected by the PLL. Two software PLL technologies are compared by using the simulation analysis which is based on the d-q transformation. To provide the basis for the design of grid-connected inverter, the advantages and disadvantages of two software PLL technologies are analyzed under different grid failure conditions, such as one phase voltage dropped, two of three phase voltage (TPV) dropped, grid frequency mutated, and grid voltage offset, etc. Particularly, the appropriate PLL technology can effectively improve the grid-connected ability of PV inverter under the grid voltage offset or unbalance conditions.
A Behavior-Based Policy for Multirobot Formation Control
Authors: Dong Jie , Chen Hai Tao , Liu Sen
Published: November 2012

This paper presents an advanced method with hierarchical architecture for multirobot formation control. The control system consists of fundamental behavior module, supervisor module and velocity tuning module. Formation and obstacle avoidance behaviors are produced by fundamental behavior module, among which the obstacle avoidance behavior is produced by fuzzy logic technique. Then a FNN (Fuzzy Neural Network) is designed to fuse the two fundamental behaviors in supervisor module. The FNN is trained through reinforcement learning. At last, a velocity tuning module is designed to adjust the speed of the robot. Simulation results validate the feasibility of this method．
The Calculation System Development of the Quadruped Robot’s Workspace on Fixed Pose
Authors: Tang Wei Gang , Wang Liang Wen , Wang Chuan Peng
Published: November 2012

Abstract: Due to the function expansion of the robot with hand-foot-integration, the robot’s frame which is a original common motion platform turns to a mechanical grab platform with floating. The workspace calculation of the robot’s working arm is the prerequisite for the robot starting to grab the aim. In this paper, the calculation system of the robot’s workspace on fixed pose is introduced. The calculation of the robot’s total centroid position is described, the stability of the robot is analyzed and the relationship between the workspace of robot and the stability criterion is discussed. The calculation process of the workspace is given and a numerical example is illustrated. The System can be used for motion control of robot and provide the theory basis for realization of automatic grab.
The Research of Predictive Control Algorithm for the Three-Tank Water Level System Based on the Multi-Model
Authors: Ji Zhen Ping , Shi Zhan
Published: November 2012

Three-tank water level system has the characteristics of nonlinear, large time delay, time-varying parameters, and the system is broadly representative in the research of non-linear and inertial process control. For the controlled object’s strong-nonlinear characteristic when the liquid level given value changes, a multi-model predictive PID cascade control strategy was presented to improve response performance of the control system. On the basis of analyzing the dynamic characteristics of the object, multiple sub-model of the object was established, and a global approximate model of the complex object was obtained as the predictive model by the weighted sub-model. Owing to the rapid response characteristic of PID control, we built the predictive control PID cascade control system by combining PID algorithm with predictive control. The experiment results show that the control algorithm can achieve good tracking control, and greatly improve dynamic and static performance of the system.
Implement of Robot Arm Body Feeling Interaction System Based on the Kinect Skeletal Information
Authors: Lin Hai Bo , Mei Wei Lin , Zhang Yi
Published: November 2012

This paper presents a novel method to control a robot arm based on the human skeletal information. First, the depth data is obtained by using a Kinect device. Skeletal tracking technology is used to deal with the depth data to match the various parts of the body and the 3D coordinates of each joint of the body are established. Then, the 3D coordinates are proposed to calculate the rotation angle of the human waist, shoulder, elbow and wrist joints. These four joints of the body are one-to-one correspondence with the four joints of 4-DOF robot arm. Finally, a transformation is conducted to map the calculation results into control commands, and the control commands are sent to the controller of robot arm by serial ports to achieve body feeling interaction. The experimental results show that the method can effectively control the robot arm to rotate and grab objects.
The Energy Consumption Analysis of Four-Legged Walking Robot by Using Different Motion Laws
Authors: Zhang Xiao Hui , Wang Xin Jie , Wang Liang Wen , Chen Wei Hong
Published: November 2012

In this paper, controlling the motion of mass center of robot by different motion laws is discussed to reduce motor’s drive power of robot joint. Firstly, correlation theory is described; obtain that if the (AV) value of motion parameter of robot’ mass center is smaller; the torque of drive motor which needs to drive robot is smaller under the same conditions. Then, in the process of robot ZQROT-I running the straight gait, two typical motion laws are used to control mass motion of robot; motion performance of the robot is analyzed with Adams. Analysis result indicates that control mass motion of robot by the use of motion laws with small (AV) value has certain effect in saving working energy of robot.
Application and Simulation of Single Neuron PID in IBVS
Authors: Dong Jie , Zhang Li
Published: November 2012

Visual servo control is one of the central issues in the research field of intelligent robot. In order to obtain more effective information from the environment, visual sensor is used in robot control. This paper mainly studies the application of intelligent algorithm in visual controller. Through the simulation comparison between Single neuron PID and Fuzzy adaptive PID which are introduced to IBVS, we can find that the proposed method could get better effect in convergence and fast performance.
A New Multi-Scroll Chaotic Attractors Synchronization Technique
Authors: Li Dan , Wang Lu
Published: November 2012

Multi-scroll chaotic attractors synchronization technique is a research focuses in recent years. This paper focuses on multi-scroll chaotic attractors in the four-dimensional system. It uses variable feedback synchronous method and active-passive synchronous method to achieve the two 6-scroll chaotic attractors’ synchronization. The feasibility of this method is proved by theoretical analysis and numerical simulation. Simultaneously, it gets a better synchronization results.
The Research on the Application of Intelligent Robots in Small Storage and Logistics Based on Improved PID Control Algorithm
Authors: Hu Ke Man , Hu Hai Yan
Published: November 2012

Studying on PID control algorithm and through the analysis of the control parameter of scalar part, integration part and derivation part, the author investigates systematically on the motion control system of the intelligent robots in small storage and logistics, and presents an improved PID control algorithm. The improved PID control algorithm not only maintains the merits of the original one, but also simplifies the multifarious adjustment process of the control parameters of scalar part, integration part and derivation part. The improved algorithm turns out to be effective after the simulation and verification by the MATLAB and can be applied and promoted to other practical controls field.
Design of Teleoperation System of Duct Cleaning Robot
Authors: Peng Jiu Ying , Sun Wei , Ouyang Ming Hua , Zhou Zhi Wei
Published: November 2012

With central air-conditioning ventilation pipe cleaning as the research object,a teleoperation system of duct cleaning robot is designed and realized. The framework and function structure of the system are given and a remote control software of duct cleaning robot is developed based on VC.With the help of this system, operators can observate and remote operate the robot in real time and dynamically by making use of 3-D virtual environment and remote video monitor system.
Synchronizing Fractional Chaotic Genesio-Tesi System via Backstepping Approach
Authors: Zhao Ling Dong , Hu Jian Bing
Published: November 2012

Abstract. Based on fractional nonlinear stable theorem, backstepping approach for designing controller is extended to fractional order chaotic system. The controller is designed to synchronize fractional order Newton-Leipnik chaotic system via the backstepping approach. Numerical simulation certifies effectiveness of the approach.
Based on STATCOM in Power Distribution System Design and Simulation
Authors: Zhang Qi Chao
Published: November 2012

The basic role of the STATCOM are continuous and rapid control of reactive power, fast response, issued or absorb reactive power to control the transmission system it is connected to the node voltage, inhibition of harmonic pollution, reduce line loss. The development of STATCOM is to solve the problem of voltage stability and effective means, is the main development direction of DFACTS technology. According to the direct current control method to design compensation device, emphatically introduces the device main circuit design step and process, and use MATLAB software simulation, the feasibility of the design is proved.
Optimal Design for Clasp Arm of Small-Caliber Deep Well Rescue Robot
Authors: Wang Chuan Jiang , Jiang Hao , Zhang Zhi Xian , Sun Xiu Juan , Liang Hong Cheng
Published: November 2012

In view of the backward present rescue technique for small-caliber deep well, a kind of multifunctional rescue robot is designed, which is composed of a manipulator, a rescue mechanism, an anchorage mechanism, and a set of oxygen supply equipment. Owing to the different postures of the fallen person, the clasp arm of rescue mechanism needs to adjust itself to obtain an ideal rescue orientation in the narrow deep well. Furthermore, the clasp arm bears much more weight when it clasp and fix the fallen person. So, the optimal design about the clasp arm is studied. Meanwhile, based on SolidWorks software, the stress analyses for the designed clasp arm with loads have been finished. Results show that the performance of the optimal designed clasp arm is perfect, which make sure that the rescue robot is capable of carrying out complicated rescue.
Selt-Tuning Intelligent Control of Hydrogenerator Set Based on Wavelet Neural Networks
Authors: Liao Zhong , Ye Bin Yuan
Published: November 2012

Considering of the highly nonlinear, time-variable and complex dynamics and the easy variance of hydrogenerator set system’s structure and parameters, a new selt-tuning control approach for hydrogenerator set system based on the learning characteristic of neural network and the function approximation ability of the wavelet analysis is studied. The selt-tuning control system consists of two wavelet neural networks, one realizes active identification and another control for hydrogenerator set. Theory and simulation results show that it is valid not only to the litter dynamic condition of hydrogenerator set systems, but also to the big dynamic condition, and it is more effective improve the dynamic and stationary performance than those based on neural networks.
Research on CCD Infrared Image Threshold Segmentation
Authors: Ma Xing , Han Jun Li , Liu Chang Shun
Published: November 2012

In recent years, the gray-scale thresholding segmentation has emerged as a primary tool for image segmentation. However, the application of segmentation algorithms to an image is often disappointing. Based on the characteristics analysis of infrared image, this paper develops several gray-scale thresholding segmentation methods capable of automatic segmentation in regions of pedestrians of infrared image. The approaches of gray-scale thresholding segmentation method are described. Then the experimental system is established by using the infrared CCD device for pedestrian image detection. The image segmentation results generated by the algorithm in the experiment demonstrate that the Otsu thresholding segmentation method has achieved a kind of algorithm on automatic detection and segmentation of infrared image information in regions of interest of image.
Study on Bionic Principles of the Parasitoid Fly Ormia Ochracea for Sound Source Localization
Authors: Wang Qing Sheng , Liu Xiao Hang
Published: November 2012

A new type of instrument is designed to accomplish the purpose of localizing the sound source by a relatively compact structure. This bionics structure is designed to mimic the localization function of the ears of the parasitoid fly Ormia ochracea, and it consists of three elastic diaphragms, three bars which connected to the diaphragms, and the other mechanical components. The analysis of this structure’s dynamic behavior shows that the incident angles of the sound have special relationship to the responses of this instrument, and the incident angles can be estimated by detecting the vibrations of the three elastic diaphragms.
Single Image Haze Removal Based on Dark Channel Prior Applied on Air Duct Robot
Authors: Yang Peng Fei , Sun Wei , Liu Sheng Nan , Ouyang Ming Hua
Published: November 2012

The rule of dark channel prior has made significant effect in outdoor image dehazing. The camera on air duct cleaning robots will capture foggy pictures when they are working because of raised dust, these foggy pictures have serious impact on the robot cleaning work. According to the characteristics of pictures in air ducts, we remove haze of these images based on dark channel prior, experimental results show that this method has good effect.
Design of Program Framework of Binocular Vision Measurement System Based on DM642
Authors: Dong Chen , Dai Shu Guang
Published: November 2012

As the rapid progress and development of DSP technology, a new way to solve the video signal processing was accepted. At present, binocular measurement instrument are mostly based on image capture card and PC on the market, expensive and bulky. For this problem, binocular vision measurement system based on DSP has been used. The design of elementary program structure about video processing which based on DSP/BIOS was finished and verified for its real-time. The results of the experiment show that the driver can be well used in the system.
Applications of C-V Model without Re-Initialization to Extract Stone Slabs Contour
Authors: Liu Ji Fei , Li Min , Liao Jian Jun
Published: November 2012

C-V model without re-initialization was applied to detect the stone slab contour on simple and complex background respectively. Using the flexible initial curve which is closer to the object boundary, a stable and correct segmentation can be achieved rapidly. For the simple background, this model can exactly detect the stone slab contour. While for the complex background, the result somewhere is an approximation of object contour because the object and background have nearly the same intensity. Additional work will be done to perfect the results.
A Servo Control System of Dynamic Target Simulation Device for Aerial Camera
Authors: Ji Qi
Published: November 2012

This article introduces a dynamic target simulation device to evaluate dynamic image quality of the aerial camera. The device simulated the positional relationship of the sky and ground in the laboratory when aerial camera flies at high altitude. And it can be used to inspect camera image quality of aerial camera flying at high altitude in laboratory. At a same time, the article focuses on this servo control system of device, building a control model, and giving control strategy. The servo control system was proved stably and reliably after experimental verification. And it provides a strong guarantee for the test of the dynamic image.
Vehicle-Mounted Camera Optimal Setting and Lane Projective Model for Lane Detection System
Authors: Chen Yong , He M. Y.
Published: November 2012

Lane detection system is generally composed of three modules, lane image acquisition with camera, lane recognition, and lane parameters calculation. The camera setting in lane image acquisition module determines the lane information content in image. This paper proposes the camera extrinsic parameter optimal setting for lane detection, which is derived from the lane projective model in image. Firstly, the general lane projective model in image is introduced. Then the camera extrinsic parameters error influence on the lane parameters calculation is analyzed and the camera extrinsic parameters setting ranges are gotten. Finally, the optimal camera extrinsic parameters settings are derived based on the lane projective model and the compact lane projective model is given. By using the camera optimal setting, the lane information content in the images captured by the camera can be maximized and the lane projective model can be compacted.
Image Reduction Method for Rice Leaf Disease Based on Visual Attention Model
Authors: Liu Li Bo , Zhao Chun Jiang , Wu Hua Rui , Gao Rong Hua
Published: November 2012

Analyzing the crop growth status through leaf disease image is one of the hottest issues in agriculture and forestry fields currently. But the size of image gathered by digital camera is too large, the focus of this research is to zooming-out image at the condition of ensuring the main information which carried by the image to distort lower. Based on the further study of visual attention model proposed by Itti and Ma YF. This paper establishes visual attention and visual saliency map of rice blast and brown spot disease image, whose size is 4272*2878 pixels. Finally, determines the reduction scale of the corresponding effective target collection and provide a new way to reduce the plant leaf images.
Texture Image Segmentation Based on GLCM
Authors: Li Min , Liao Jian Jun
Published: November 2012

The paper proposed a method on marble texture image segmentation based on Gray Level Co-occurrence Matrix (GLCM). At first, compute the Contrast matrix on basis of GLCM. Then choose the maximum of the matrix as the threshold to segment the object. At last extract the object contour with curve fitting method. Experiment results show that the method is accuracy.
The Application of Information Fusion Technique in the Early-Warning and Forecasting System for Switchbox Fault Arc
Authors: Lu Yong Fang , Lu Ke
Published: November 2012

Aimed at the problem of poor accuracy and false positive rate in the early-warning and forecasting system for switchbox fault arc .low precision problem exited in fault location of transmission line, a new fault locating design is presented to improve the precision and speed of fault location. The short-circuit fault location in transmission line chooses DSP chip TMS320VC5507 as the central processing unit. This system can realize accurately in real-time acquisition and conversion of the fault traveling wave, and accomplish the fault location properly and removal immediately. The simulation results show that this system has the characteristics of quick detection and high precision.
Study on CMP Intelligent Monitoring System of Large-Size Silicon
Authors: Guo Xiao Guang , Zhang Xiao Ji , Guo Dong Ming
Published: November 2012

The design ideas of intelligent control and the influence mechanism of process parameters on chemical mechanical polishing (CMP) are combined to develop the CMP intelligent monitoring system, which has the function of learning, inference and memory. The system can be used in many kinds of CMP facilities, the process parameter from the system can be used to control each unit of the CMP facility. And compared with the past way of processing by virtue of experience, the system has friendly operating interface and is easy to operate. The volume production of silicon wafers can be achieved by the total CMP intelligent monitoring. The efficiency of production can be improved highly on condition that the quality can be ensured.
A Novel Method for the Design of Digital System Fault Diagnosis Instrument Based on VXI Bus
Authors: Xu Juan , Zhou Qi Zhong
Published: November 2012

To meet the requirements of the testing for modern complex digital systems and devices, A novel method for the design of digital system fault diagnosis instrument based on VXI bus is described in this paper, and the composition and design principle of the hardware of the presented method is introduced in the paper. The instrument designed with the novel method provides 64 pins of Transistor-Transistor Logic (TTL) digital I/O for the test of digital modules and systems. Testing can be automatic accomplished by programming a sequence of test vectors. Real-time data comparison ensures fast test execution by eliminating the post processing of test data. Branching and test execution pause enhance the ability to synchronize the test system to activity of the unit under test (UUT). The experimental results show the module designed with the presented method has much more higher performance than the only similar manufacture VX4820.
Performance Analysis of Several Common Filter
Authors: Jiang Hai Bo , Cai Jing Zhi
Published: November 2012

Denoising is the initial stage of image processing, in preparation for the subsequent processing of the image. This article describes a field of several denoising used filters include average filter, median filter, Wiener filter, Kalman filter. Combination of diagrams, will describe their filtering principle, at the end of this paper,analysis signal to noise ratio of image and other performance indicators .
Design and Realization of a Flexible Overland Freight Monitoring System for Hazardous Chemicals Based on Multi -Network
Authors: Pei Xiang Dong , Tan Qiu Lin , Zhu Si Min , Xiong Ji Jun
Published: November 2012

Flexible Overland Freight Monitoring System for Hazardous Chemicals, with the functions of tracking and localized, is designed. Sensor network, which is the integration of sensor technology, embedded and wireless technology, is a novel technique about data acquiring and processing. Some technologies cooperated with diagnosis are included, such as sensor, data collection, signal analysis, data processing, database, and net transmission. To achieve the hazardous chemicals from the production, storage, transportation to the whole process of remote real-time tracking and monitoring，This system receives real-time GPS position data, and sends it to internet through GPRS net. And with the technique of GIS, it realizes managing and monitoring tankers at the watching center. The converter has interfaces of GSM protocol and can send the control information and data of the control center to any terminal in the GSM network. Likewise the remote data can be transmitted to the control center with the converter. Controlled by central control system, the system can operate automatically and continuously.
Research on Simulation Data Management of Complicated Mechanical Product
Authors: Li Jian Feng , Liu Guo Liang , Wang Li Qin
Published: November 2012

Presently, simulation data management of complex mechanical products is a key issue on the aspect of CAE technical application. Based on the functional analysis of simulation data management platform, this research proposes a B/S-based architecture for data management, and then analyzes several key techniques of simulation data management. Finally, as a preliminary exploration, performs study on novel combinational solution, which is a simulation data management platform integrated with SimManager and Teamcenter 9.
Study on Common Ground Testing Platform Technology for Telemetry Core Equipment
Authors: Tan Qiu Lin , Pei Xiang Dong , Zhu Si Min , Xiong Ji Jun
Published: November 2012

On the basis of automatic test system of the status in domestic and foreign, by analysis of the various functions and performance of the integrated test system, a design of the integrated test system is proposed, FPGA as the core logic controller of the hardware circuit. The system of the hardware design include: digital signal source output modules, analog output module and PCM codec module. Design of hardware circuit are mainly described. In addition, a detailed analysis of some key technologies in the design process was given. Overall, its data exchange with host computer is through the PCI card, data link and bandwidth can be expanded in accordance with the actual needs. The entire system designed in the modular principle, which has a strong scalability.
Design of Monitoring System for Mine Emergency System
Authors: Ma Jun Xian , Yuan Xue Qing , Xin Rong Jian
Published: November 2012

Monitoring system for mine emergency system was discussed. Mine emergency system helps the people to survive when mine disaster occurs. The monitoring system is essential part of the system and is designed in VC++.The demand analysis and the system architecture was discussed. The user-defined communication protocol was described and the system handled the communication data using buffer method.
Research on Desert Soil Moisture Measure & Control System
Authors: Li Shi Wei , Li Shuai Bing , Dong Hai Ying
Published: November 2012

For the purpose of meeting the desert soil moisture easurements and control requirements accurately, a soli moisture control model is set in this paper. As the system is of delay and nonlinear characteristics, we used a frequency domain reflectometry (FDR) principle moisture sensor to measure the desert soil in tratification and a threshold switch fuzzy adaptive PID control method is taken in order to get a highly dynamic performance. Additionally, We made an experiment and a simulation analysis, The results show that the measure and control method we used not only has a strong robustness, but also can quickly and accurately detect and control the sand pit soil moisture.
Design of Artificial Rainfall Simulator for Model Test of Landslide
Authors: Hou Jian Shu
Published: November 2012

Landslide is a main type of natural disasters, and makes huge human life losses and property losses. Landslides are often triggered by rainfall, especially long time rainfall or high intensity rainfall. Model test is an effective method to study the mechanism of landslide. An artificial rainfall simulator for model test of landslide is designed, which including water reservoir, water pressure control and rainfall drop making needles. To maintain the rainfall intensity, the water lever of reservoir is kept constant by a servo-control system. And a cross leaf can rotate in the raining process is set in the front of rainfall drop making needle to make the local rainfall drop distribution uniform. Then particle flow method is used to simulate the rainfall drops making process, and the result shows that he reasonable rotation velocity of needle leaf should be confirmed in the rainfall calibration to maintain a uniform distribution before test.
Research on Fault Diagnosis Model for Substation with Redundancy Protection Based on Petri Net
Authors: Dong Hai Ying , Li Xiao Nan , Ren Wei
Published: November 2012

Due to layering distribution, double network and dual-disposition characteristics of 750kV substation, Petri net diagnosis model which based on redundant protection for substation is proposed. In this model, a redundant knowledge representation method is adopted from components to the local and the whole, then components redundant diagnosis-model is constructed on basis of it. The model can be decomposed into main and redundant subnet-model based on Petri net by using two sets of protective device information, and considered remote backup protection, which realize fault tolerance of dual-machine. Through information fusion of redundant diagnosis model of components, the local and the overall model is established. The results show that the model achieves high efficiency and reliability.
An Analysis on Wellbore Collapse of Open Hole Completion in Carbonate Formation
Authors: Yang Xiang Tong , Liu Zhi Yuan , Zhang Hao , Xiong Qi Quan , Liu Hong Tao
Published: November 2012

In TK oilfield, there is a large content of carbonatite in cambrian-ordovician, with great depth 4500m-6300m, high temperature 120oC -140oC, anisotropy, developed fracture system and complexity in geological structure. This paper is concerned about wellbore collapse in open hole completion of well R1 and other wells in the collepse well area, and trying to solve this problem through statistics of collapsed wells, and calculate with the mechanics model coupled with temperature field, fluid flow field and rock-mud physicochemical reactions. The result show that the development of hydration stress in planes of weakness, occurrence of nature fractures and technic stress are the most influential factors on wellbore stability. A wellbore in a formation with nature fractures around the wellbore has a testing pressure difference window of 21-28MPa.
A New Method for Calibrating Digi-Data Input Power Meter
Authors: Lin Guo Ying , Zhou Shang Li , Sun Wei Ming
Published: November 2012

Recently, China is developing smart grid with great strength, more and more digital substations will be built, therefore, it is time for thinking of the accuracy of the new electric energy metering devices. But the new electric energy metering devices are different from the traditional meters by using Digi-Data interface instead of voltage and current interface, requiring a new method of testing error. By equivalently transforming electric power from analog to digital, we design a special electric power standard with digital-data-interface according to IEC61850. Based on the special electric power standard, this article introduces a new method for calibrating digi-data input power meter.
Optical Fiber Temperature Measuring Technology Application Research in Power System
Authors: Han Zhi Qiu
Published: November 2012

Electrical overheating and fire are multiple faults in power system, optical fiber temperature measurement technology is better than the traditional temperature measurement device. It can test electrical system changes in temperature more effective and reliable, thus effectively contain similar accidents. This paper expounds the optical fiber temperature monitoring system warning the working principle, system constitution and its characteristics, discusses the practical application of optical fiber temperature warning monitoring system in power system.
Research on Land Cover Classification for SPOT5
Authors: Liu Jin Mei , Wang Guo Yu
Published: November 2012

The type of land cover is principally determined by spectral reflectance of land. Different surface features have distinct absorption and reflection properties on different bands. The characteristic is used to identify land cover type from multi-spectral images. Reflectance coefficients and spectral differences are extracted as feature vector to represent each pixel. Self-Organizing Feature Map neural network is adopted for feature classification. A semi-supervised correction strategy is proposed to amend the classification errors. The images of Qingdao Agricultural University campus acquired by SPOT5 were selected as experimental data. The results show that the overall classification accuracy of samples is up to 83%, moreover, the proposed method is helpful in solving the phenomena of same object with different spectrums or different objects with same spectrum.
Measurement of Human Body's Feature Dimensions Based on the National Standards
Authors: Ma Chao , Wen Pei Zhi , Hu Jun Rong
Published: November 2012

In order to recognize and extract feature dimensions automatically from point clouds of human body, a method based on National Institute of Standards is proposed. Using the data provided by the National Institute of Standards GB10000-1988 to divide the search region of each feature point firstly. Then, extracting the feature points in the search region by comparing the coordinate values and the distance from point to straight line with other points . The method has nothing to do with the body shape and improves the robustness of feature point extracting. In the aspect of body dimension's measurement, the critical feature dimensions are calculated by intersection-contour perimeter method and distance between two points methods.
Study on GPS Ranging Technology for Intelligent Detection of Subgrade Compaction
Authors: Du Wen Ya , Song Wei Ping , Feng Deng Chao , Zhang Li Hong
Published: November 2012

Subgrade compaction is an important task in modern traffic fields, where GPS ranging technology is one of the key technologies in intelligent compaction. In the paper, NMEA communication protocol was illustrated, the statement of GPGGA was analyzed, and the extraction of the single point geographical coordinate was realized correspondingly. Aimed at the phenomenon of data loss in signal drift and data acquisition, the missing data estimation algorithm for longitude and latitude was adopted to obtain the complete data sets as well. Finally, the deficiencies of the traditional longitude and latitude distance measuring formula were analyzed and a new model of measuring distance of longitude and latitude was discussed. The experimental results show that the method has the better stability of measurement, the higher test accuracy, which has a good application prospects in intelligent compaction. However, the real-time property of data processing still needs further research.
A Design of the Detection End Antenna with the Structure of Double Layers Printed Dipole
Authors: Fu Wei Long , Lin Jin Cai , Li Bin
Published: November 2012

This paper examines a new measure of the detection end antenna model designed to the frequency-selective level,broadband electric-field probe.It is based on double layers printed dipole which overcomes the difficulties found in the prototype transfer-standard electric-field probe which put forward by NBS in 1986.The difficulty of fabracation is fallen and it realize the performance of the standard E-field probe using traditional single layer structure dipoles.It is much easier to fix the antenna.The main theme of the paper is to extend the utilization of the double layers printed antenna using the theory of resistively tapered dipole for broadband E-field probe’s antenna.This double layeres printed dipole element allow a analysis of gain frequency response curve flat within 0-2.5dB from 11.8GHz to 15.2GHz,and obtain a stable isotropic response.
Experiment Studies on Wavelet-Based Damage Detection for Pipeline Using Ultrasonic Guided Wave
Authors: Zhang Wei Wei , Wu Jing , Zhao Zi Long , Ma Hong Wei
Published: November 2012

In this paper, a wavelet-based pipeline inspection method was illustrated experimentally. Piezoelectric ceramic (PZT5), as sensors, was used to generate and receive the guided wave signal. To be specific, a piezoelectric ring was an excitation sensor in order to generate L(0,2) mode guided wave and 16 evenly distributed piezoelectric patches in pipe circle were the reception sensors. A transverse artificial notch in the pipe wall could be detected successfully by the guided wave. For reducing the noise from the testing signal, a wavelet-based denoise technique was proposed Based on the denoised signal, both location and size of the defect could be identified. The result shows that the crack size identification was in good agreement with the theoretical prediction.
A Design of Circuit and its Application of the Power Frequency Voltage Linear Superposition Method
Authors: Song Qiang , Pan Feng
Published: November 2012

In order to improve the power frequency voltage ratio standard calibration techniques to meet the application of UHV power grid，a measuring circuit based on power frequency voltage linear superposition method was proposed. A three-port network was fromed by connecting two shielding voltage transformer with the same rated voltage ratio in series. The voltage coefficient of a voltage transformer was tested by double voltage method based on the proportionality and superposition of the linear network. The measuring circuit based on power frequency voltage linear superposition method can prevent the shielding error of the voltage transformer during the mearurment, making it used in voltage ratio standard self-calibration system with higher voltage and precision. The test has proved the feasibility and accuracy of circuit of power frequency voltage linear superposition method.