bluuebunny/crossref_metadata_2025 huggingface dataset:
Application of the Data Fusion Method Based on Fuzzy Theory and Evidence Theory in Vehicle Recognition
Authors: Liu Yu Xin , Jia Xu
Published: July 2012

A data fusion method which based on fuzzy theory and evidence theory was discussed in this paper， and it is applied to the vehicle type recognition simulation research using some multi-sensor characteristics such as the appearance and the length of the vehicle. The experimental results show that this method can avoid the limitation of single sensor, reduce the sensors uncertainty, and improve the identification accuracy.
The Comparison of Different Chromosome Coding Method Based on Genetic Algorithm
Authors: Wu Yan Min
Published: July 2012

Genetic Algorithm affords a new solution to solve complicated problems, especially some NP problems. Genetic Algorithm’s coding method decided the algorithm efficiency and the complicated degree of program design which should use different coding methods to solve different types of problems.
A Semi-Supervised Sparsity Discriminant Analysis Algorithm for Feature Extraction
Authors: Sun Hui , Yi Yu Gen , Lv Ying Hua , Cai Hui Tao , Wang Jian Zhong
Published: July 2012

Recently, l1-graph was proposed as a new graph construction procedure. Compared with the kNN-graph and ε-graph, l1-graph possesses three advantages: robustness to data noise, sparsity and datum-adaptive neighborhood selection. In this paper, we propose a novel semi-supervised feature extraction method based on l1-graph termed Semi-supervised Sparsity Discriminant Analysis (S3DA). The proposed S3DA maintains the advantages of l1-graph, and more importantly, it has better capacity of discrimination for classification. Experimental results on face and gene expression databases demonstrate our proposed approach outperform some other state of the art algorithms, and also show the feasibility and effectiveness of our proposed approach.
Feature Extraction of Fault Engine Audio Signal Based on Wavelet Packet Transform
Authors: Xu Gao Huan , Ye Jun Xiang
Published: July 2012

Due to the different structure of the machine parts, machine vibrations sent audio signal have different frequency. The early defect, audio signal can be analyzed well by wavelet packet transform. After wavelet packet decomposition and reconstruction, Audio signal noise reduced. And then through high and low frequency decomposition, we can constitute the energy characteristics. The experiment shows: the extracted features have good structure.
Three-Dimensional Modeling Efficiently Based on the 3DMAX and OPENGL
Authors: Fang Jie , Wang Xiao Feng
Published: July 2012

OpenGL is independent of the window system, and did not provide the function to draw complex three-dimensional model, so it is difficult to properly control OpenGL and create complex model .This paper will achieve to build complex three-dimensional model efficiently and take good effect in practice with combining OpenGL and 3Dmax or with the help of functions of VC++ to develop based on applying window frame of Windows powerfully.
The Study of Signal Denoising for Laser Cutting Based on Adaptive Wavelet Denoising
Authors: Hao Hui Juan , Xu Ji Yong , Li Juan
Published: July 2012

In order to reduce the noise of acquisition signal in laser cutting, an adaptive wavelet denoising method is proposed in this paper. Based on the analysis of the limitations of traditional threshold method, the particle swarm optimization algorithm is used to select the optimal threshold of wavelet. Compared with the commonly hard and soft threshold method, the experiment results show that the method used in this paper is relatively stable, and can reduce noise excellently. The method can provide more accurate signal for quality analysis in laser cutting .So the method can be used in noise denoising of pulse-induced acoustic sound.
A New Automatic Exposure Algorithm for Astronomical Image and its FPGA Implementation
Authors: Wang Hao , Cao Jian Zhong , Zhou Zuo Feng , Yan Su , Yan A Qi
Published: July 2012

Automatic exposure control is the process of controlling the exposure time of the digital imaging system to obtain the desired image which can fit the human vision during the imaging process. A new automatic exposure algorithm for astronomical image is proposed. The pixel value weight is determined by exploring the maximum range of the image histogram. Additionally, the structure of the implementation based on FPGA and experiment results for real data are given. The experiment results show that the proposed algorithm can effectively achieve the real-time automatic exposure control.
Application of Novel Subspace Pursuit on Guided Wave Signal Recognition Based on Modified Differential Evolution Algorithm
Authors: Shen Chuan Jun , Wang Yue Min , Liu Yan , Sun Feng Rui
Published: July 2012

A kind of novel subspace pursuit method is proposed to reduce the complexity of subspace pursuit. The modified differential evolution algorithm (MDEA) is applied to the modified subspace pursuit (MSP) by choosing chirplet function as match atoms. A steel pipe with holes is detected by guided wave and the measured signal is decomposed and reconstructed by MSP. The matched result is compared to the process result from MP with DEA. The SNR of the processed signal is improved obviously, and the defect echo can be identified easily. The matched parameters get by MSP and MP are compared and analyzed. The Wigner-Ville distribution (WVD) of the detection signal and its matched result are computed and compared. The WVD of the detection signal is enhanced after processed by MSP. The defect locations and the center frequency of the excitation signal are more exactly get from MSP than from MP. The computation time by MSP is a little longer than by MP. Therefore, MSP is a useful signal recognition and defect location approach for pipes guided wave NDT.
The Application of Information Fusion Technology in the Intelligence Structure Safety Monitoring of Tunnel Engineering
Authors: Chen Hai Yan , Xie Wen Bin , Qiu Guo Qing , Zhang Suo Juan , Qi Xiu Li
Published: July 2012

This paper integrates the sensing technology, information science, artificial intelligence theory, computer technology and traditional structures safety monitoring theory, gives out a comprehensive system of the Tunnel engineering structure safety monitoring which integrated with the safety of the structure information extraction, comprehensive processing and analysis, structure diagnosis and safety evaluation process. Established a set of scientific and reasonable theory and method of structure safety monitoring of tunnel project.
Theory and Modeling Study on Deep Water Heave Compensation System
Authors: Zhao Teng , Sun Peng
Published: July 2012

The paper is based on the influence of surrounding environment for heaving motion of Mother-ship during installation exercise in deep water. The relevant information of heave compensation system and research achievements in similar areas and the research status and trends of heave compensation system are mentioned. Literature survey, understanding the key link and technical difficulties of heave compensation system is carried out. According to current development and engineering needs of China's offshore deepwater installation technology, the heave compensation system dynamics model, which meets our deepwater installation requirements, is established using nonlinear dynamic theory and elastic vibration system. Basic principles of Hydraulic drive system, the law of movement response, and the factors affecting the response characteristics have been explored and the results of various factors are analyzed and researched.
Video Vehicle Detection Method Based on Multiple Color Space Information Fusion
Authors: Shao Hong Xiang , Duan Xiao Ming
Published: July 2012

A detection method which selective fuses the nine detection results of RGB, YCbCr and HSI color space according to the image color space relative independence of each component and complementarities is approached in order to improve vehicle video detection accuracy. The method fuses three different detection results in nine components by the value of H when the value of both S and I are higher and does another three detection results when the value of both S and I are smaller. Experiments show that the method compared to the traditional method using only the detection results of the brightness component improved substantial, reduced empty of the detected vehicle a large extent and increased traffic information data accuracy depending on the detection result.
A Strategy for Avoiding Energy Holes Based on Data Fusion in Wireless Sensor Network
Authors: Song Xiao Ying , Wen Tao , Guo Quan , Wu Di
Published: July 2012

Energy holes problem is one of key issues for wireless sensor networks (WSN). At present, the resolved strategies mainly focus on non-uniform node distribution and adjusting transmission power. However, some costs are incurred by non-uniform node distribution. With the number of nodes increasing, the total number of nodes grows exponentially, and there is a need to improve physical conditions when we increase transmission power significantly in large class of network model; To overcome the limitation, we propose the strategy of data fusion, whose reason is that it is not limited to the size of network, and does not need complicated physical conditions. In this paper, we first establish a network model Multiple-Layer and Multiple-Clusters in corona model (MLMC) to analyze the loading energy consumption. What’s more, we consider energy consumption when network is constructed. Furthermore, we fully introduce our strategy of data fusion, and prove two theorems to balance energy consumption for resolving energy holes problem. Finally, we compare and analyze the total energy consumption and network lifetime between before and after data fusion. The experimental results demonstrate the performance advantages of our approach. The best is to read these instructions and follow the outline of this text.
Ambiguous Region Matching and Boundary Pixel Optimization for Stereo Computation
Authors: Cui Xing Nian , Yang Fan , Liao Qing Min
Published: July 2012

In this paper, we present a stereo matching algorithm based on planar surface hypothesis. It improves the results of low texture regions and mixed pixels on object boundaries. First, regions are segmented by applying the mean-shift segmentation method. Then we propose a coarse-to-fine algorithm to increase the reliable correspondences in low texture regions. Third, the Belief Propagation algorithm is used to optimize disparity plane labeling. Finally, for a mixed pixel, we utilize the results of the depth plane and the local region of it to regulate its disparity. Experimental results using the Middlebury stereo test show that the performance of our method is high.
Research on Detection Method of Direct Sequence Spread Spectrum Signals
Authors: Zhu Yun Hang , Deng Ming Yuan , Zhang Wei Bing
Published: July 2012

Direct Sequence Spread Spectrum (DSSS) Communication has been widely applied in Personal communications network, WLAN, the third-generation mobile communications, satellite communications systems, military tactics communications and etc, thanks to the DSSS signals’ strong anti-interference ability, low probability of being intercepted and outstanding multi-access communication ability. At the same time, the Problem of estimating Signals has been of great research interest with the development of wind-band weak signals processing and communication antagonism. A new effective detection method of DSSS is proposed, combined the method of wavelet transformation with cycle spectral correlation approach, from the perspective of jamming in non-cooperation condition, and a simulation result of signals--BPSK is given.
The Application of Spatial Super Resolution to Detect and Resolve Signal in Ship Borne OTHR
Authors: Li Lin , Yuan Ye Shu
Published: July 2012

As an essential branch of over the horizon radar (OTHR), ship borne OTHR contains several important issues, the most significant one of which is how to detect and resolve signal from the broadened first order Bragg lines of unexpected platform motion in the same Doppler resolution cell. In this paper, a theory is proved that the signal’s azimuth is different from the first order sea clutters’ in the same Doppler resolution cell, based on which the spatial super resolution could be used to detect and resolve signal from the first order sea clutters in the echo spatial spectrum. In the ocean, the environment is much more complicated, the signals are also coherent of the widespread multi path effects and the noises are spatial correlated between array elements. MUSIC is failed in this field. Symmetric forward and back spatial smoothing (SFBSS) algorithm is proposed in this paper. The correctness and efficiency are proved by our simulation. This method has a high accuracy and a certain actual value to detect and resolve signal in ship borne OTHR.
An Illumination Compensation Algorithm Based on Single-Scale Retinex and its Application in Face Recognition
Authors: Liu Hong Hai , Hou Xiang Hua
Published: July 2012

Due to the affect of illumination conditions when taking face image, the traditional algorithm effect of face recognition in practice is unsatisfied. Thus, in order to reduce the affect of illumination conditions, the pretreatment of illumination compensation to face image is needed. The common illumination compensation algorithms have two kinds: linear compensation and nonlinear compensation, such as histogram equalization method, log algorithm, and so on, but those algorithms only perform localized enhancement for image and they cannot really reflect the original image. In this paper, a kind of illumination compensation algorithm based on color constant theory is put forward. An image is mainly made of reflection image and incident image convolution. With color constancy, the incident image is not subject to the influence of illumination conditions and reflection image weakens image effect. Thus, if the incident image is found, the image is enhanced. Firstly, the acquisition method of incident image is analyzed. By the decomposition of Gaussian function, the incident image can be obtained, which provides a theoretical basis for the obtainment of incident image. Then, the expression of Retinex is analyzed. Secondly, we analyze the algorithm based on Retinex. In the horizontal direction and vertical direction of image, compensation is performed and the image after compensation is expanded, so that the compensation image is obtained. Lastly, the illumination compensation results of face image by face image database CMU are given. Compared with the original image, the results show that there is obvious enhancement effect. The recognition rate of face image in complex illumination conditions is improved.
A New Algorithm for Multi-Stitching Ballistic Camera Out-Field High Precision Modeling
Authors: Guo Wen Sheng , Chen Feng , Sun Zhao You , Wang Xi Jun
Published: July 2012

Multi-stitching ballistic camera is the main optical instrument devices in the range instrumentation. Wide field of view and high precision are the main features of the ballistic camera. Due to the bad environment and transportation, there exists large impact on the precision of the devices. Under the condition of out-field, it is hard to re-modeling and re-calibration of the devices. In this paper, multi-region segmentation modeling synthesis calibration techniques based on star calibration is proposed. Experiment results show that the proposed algorithm can rectify the wide field of view optical distortion, the rotation of image surface and the center points and effectively improve the test precision of the ballistic camera.
Global Robust Exponential Stability of Discrete-Time BAM Neural Networks with Time Varying Delays
Authors: Zhang Rui , Liu Jian , Zhang Ying , Wang Chang Tao
Published: July 2012

In this paper, the global robust exponential stability is discussed for discrete-time bidirectional associative memory (BAM) neural networks with time varying delays. By the linear matrix inequality (LMI) technique and discrete Lyapunov functional combined with inequality techniques, a new global exponential stability criterion of the equilibrium point is obtained for this system. The proposed result is less restrictive, and easier to check in practice. Remarks are made with other previous works to show the superiority of the obtained results, and the simulation example is used to demonstrate the effectiveness of our result.
Embedded C Code Generation Platform for Electric Vehicle Controller
Authors: Geng Peng , Ouyang Ming Gao , Li Jian Qiu , Xu Liang Fei
Published: July 2012

This paper presents an automated C code generation platform for the development of electric vehicle controller, based on Matlab/Simulink Real-Time Workshop. By means of this method, it is possible to develop vehicle control algorithms and configure device drivers in graphic environment. Moreover, it can generate executable C code and download them into Vehicle Control Unit automatically. This technique reduces handwritten code errors, and shortens the R&D time and cost, compared with traditional method. Besides, this technology platform is applied to the development of electric vehicle controller for the first time, using a custom Simulink driver library for MPC5644A microcontroller.
Response Analysis of Heaving Motions of Deep-Sea Installation Workboat
Authors: Nie Jian Ning , Zhao Teng
Published: July 2012

Through the establishment of the ship form coefficients and calculation conditions of the given Deep-sea installation workboat, and use the 2-d strip theory to build the mathematical model of working ship moving in waves, obtaining the significant height of heaving motion of ship, according to different wave directions and working conditions, then using the AQWA to achieve the modeling calculation, by which the response time registration curves of heaving motion under typical working conditions can be given, while making a comparative analysis of the results obtained by the two different methods, it is indicated that the differences between them are not so significant, thus satisfying the requirements of the engineering.
The Design of Space Scanning Mirror Control System Based on Optimal Tracking Controller
Authors: Sui Wen Bo , Song Ke Fei , Zhang Pei Jie
Published: July 2012

Control system of space scanning mirror has high requirement of scanning accuracy. The use of optimal tracking controller, instead of traditional PID controller, can effectively improve the scanning accuracy of space scanning mirror control system. State space model of the control system is established; the control system based on optimal tracking controller is designed; simulation experiment of the control system based on optimal tracking controller is carried out. The simulation result, in comparison with the system based on a PID controller, shows that the scanning mirror control system using optimal tracking controller instead of PID controller has higher scanning accuracy and faster response.
Design of Single Roller Scutcher Control System Based on PLC
Authors: Wu Yin Feng , Liang Jian Wei , Liang Ling
Published: July 2012

This paper analyzes the control requirements of scutcher and introduces the control system scheme which is composed of programmable logic controller, touch panel and inverter. And it emphasizes the hardware constitution of S7-200 PLC control system, the pressure detection and display of cotton feeding pipeline, together with the principles of the beater speed test program and the control program of cotton feeding motor.The scutcher control system can feed cotton continuously and equably and ensure the pressure stability of the cotton feeding pipeline. In this way, it can adjust process conveniently, decrease fault rate and cut the design development cycle of new equipments to improve the control level of textile machinery.
Optimization of LD’s Temperature Control System Using Finned Tubular Radiator
Authors: Guo Fei , Zou Wen Dong , Xie Hai He , Du Qiang
Published: July 2012

By analyzing of thermoelectric cooler(TEC) working characteristics and using one-dimensional heat transfer equation, mathematical relationship between TEC working power and radiator equivalent thermal conductivity is derived. Temperature control efficiency could be improved by increasing equivalent thermal conductivity was proved. So that an optimization method using finned tubular radiator in LD temperature controller was presented, including theoretical foundation of radiator selection and system structure. Compared with normal radiator, the stable-time of the LD temperature controller using finned tubular reduces 50%, and stable-error reduces 60%, which was proved by mathematical calculation and experimental result of 2W LD system. Compared with forced air cooling and forced water cooling, the system has property of low vibration disturbance and simple structure. It followed that the finned tubular radiator was suitable for temperature control of medium and small power LD, which can improve temperature control efficiency and optimize the system.
The Design and Development of a Temperature Testing System in an Electric Fuel Injection Engine
Authors: Li Qiang , Dong Xu Xu
Published: July 2012

In order to achieve the best engine performance, electronic control unit needs to be provided a different fuel injection and ignition timing corresponding to different engine temperature while in other conditions the parameters is the same, so the temperature of the engine cylinder plays an important role. In this paper, the C8051F020 is used as the main control unit MCU and the data processing unit. The cylinder temperature signal is detected by thermistor temperature sensor and at the same time A/D conversion and data processing are completed. The acquisition temperature values are sent to LED display, while achieving ultra-high temperature alarm and ultra-low temperature alarm. This paper introduced the hardware design of temperature acquisition system, in this section this paper focuses on the choice of the temperature sensor, micro-controller selection and the design of temperature acquisition circuit and temperature display circuit. This paper introduces the software design of the temperature test system. Based on the understanding to C8051F020 MCU, with a micro-controller language this paper assembled a software program of temperature test system including the signal acquisition, A/D conversion and temperature display. This paper also designed a simple structure and processing the data speed of the temperature acquisition system.
Data Acquisition and Processing Methods of Modbus-Based Monitorial System of Long-Distance Crude-Oil Pipeline
Authors: Li Hui
Published: July 2012

In order to solve the accurate collection and processing of crude oil long-distance pipeline monitoring system data and set the scene for packet transmission problem, we based on Modbus protocol settings for automation and control, data processing and analysis of the reliability of the final draw a line unit as the unit of data organization.
Fault Diagnosis System of Tennessee-Eastman Process Based on RBF Networks and Wavelet
Authors: Liu Xiao Qin , Sun Hai Jun , Deng Shu Xian , Ji Tai Dong
Published: July 2012

BP neural networks requires for the predicted number of hidden layer neurons and the corresponding predicted function. RBF distributed organizations can effectively address a large number of fault information. RBF algorithm is combined with the wavelet. The diagnosis system is simulated for multi-variable nonlinear Tennessee-Eastman Process (Tennessee - Eastman TE process).The results show that the fault diagnosis system based on wavelet RBF algorithm is better than the traditional BP neural networks and improved wavelet BP algorithm, and can effectively solve the problem of fault diagnosis.
The Repetitive Control for Dynamic Voltage Restorer
Authors: Li Zhe , Wu Zheng Guo , Xia Li , Zhou Wei Ping
Published: July 2012

A novel control scheme for the dynamic voltage restorer (DVR) is proposed to achieve fast response and effective sag and swell compensation capabilities. In this control scheme, the proportional integral control is used to guarantee system dynamic performance and the repetitive control is used to improve voltage waveform quality. Compared to classical proportional integral control, DVR based on this control scheme can restore load voltage almost sinusoidal and shows better transient and steady-state responses when facing sag or swell conditions. The proposed control scheme has been verified by simulation on Matlab. Simulation results show that the control approach performs very effectively and yields excellent voltage regulation.
Intelligent Vehicle Coordination Model Based on Back-Propagation Network
Authors: Liu Hai Ying , An Ya Qin , Yang Xia , Yin Kai
Published: July 2012

This thesis firstly introduces Back-Propagation Network, the model for the theory and the common process. And we view from two perspectives: the running hour of vehicles and passenger distributed capacity, and adopt Back-Propagation Network into vehicle coordination. We prove that coordination based on Back-Propagation Network is correct through examples.
The Implementation Scheme of DCS Redundancy Fault-Tolerant in the Process Industry Control
Authors: Wu Ping Li
Published: July 2012

Process industry control put very high demands on the reliability of DCS. Application of Redundancy Fault-tolerant Technology is one of the most effective way to improve the reliability of DCS. In this paper, we elaborated on the implementation scheme of DCS redundancy fault-tolerant in process industry control, which includes the configuration of DCS hardware system redundancy, the redundant fault-tolerant realization method of I/O module, etc.
Logic Design of Furnace Safeguard Supervisory System for Gas-Fired Boiler
Authors: Wu Ping Li
Published: July 2012

In this paper, We designed Furnace Safeguard Supervisory System (FSSS) of gas-fired boiler, which includes the logic design of sweep control for ignition before and after shutdown, the logic design of sequence control for boiler ignition and blast-furnace gas, the logic design of Master Furl Trip(MFT) and Flame Detection. We achieved a gas-fired boiler furnace safeguard supervisory functions.
Robust μ-Synthesis Control for Parameter Variations
Authors: Li Ying , Ding Xue Gong
Published: July 2012

The robust ASAC(active structure acoustic control) model for the system of structural acoustical coupling is established and the μ-synthesis design is presented in the paper. The main idea is as follows: First, the robust performance problem of this system is transformed into the robust stability problem of an augmented system. Through the robust stability controller for this augmented system is solved by the standard D-K iteration. Simulation results show that μ-controller can provide good disturbance rejection and is more robust to parameter variations.
Optimization Methodology of Dynamic Links in Wireless Sensor Network
Authors: Zhou Hong , Fu Chun Yan , Zhi Yuan , Xue Jia Mei
Published: July 2012

Recently, research in computing connection technology of sensors has great achievement, but usually confined to the static connecting technology. Still limited is the dynamic connecting technology of sensor network. Based on the dynamic link optimization strategy of multi-hoop wireless sensor networks, we propose self-learning and self-adaptive stimulating method. Algorithm proposed in this paper is on the assumption of predictable advance selective, and can be optimized on the coupling data flow. And we apply the standard data to the experiment to testify the effectiveness of the method proposed in this paper.
In Coherent Scenes an Uncorrelated Noise Filtering Method for DOA Estimation at Low SNR
Authors: Yu Chang He , Li Jian Li
Published: July 2012

As we all know, noise always exists in any actual signal processing systems; its strength largely determines the working performance of one signal processing algorithm. Once the noise power is higher, many classical algorithms will lose the ability of the solution. In this paper, we propose a novel robust uncorrelated noise filtering method for direction of arrival (doa) estimation at low signal-to-noise ratio (snr) in coherent environment. Under the assumption of uncorrelated noise the proposed method can remove the uncorrelated noise variances from an array covariance matrix effectively. The characteristics of signal coherency structures and the simulation results using the novel method are presented.
Robust Fault Detection for Satellite Attitude Control System
Authors: Yuan Zhi , Liu Jie , Wang Zheng Fang , Wu Li Na
Published: July 2012

In this paper, robust fault detection problem for satellite attitude control system is studied. We design the robust fault detection filter for the satellite model with environmental disturbances torques. With the reference residual designed, the main results consist in the derivation of the existence conditions of the fault detection filter. Finally, a numerical example illustrates the feasibility of the proposed approach.
An LMI Approach to Mixed H_/H∞ Robust Fault Detection Observer Design
Authors: Zhang Ying Chun , Wu Li Na , Wang Zheng Fang , Jia Qing Xian
Published: July 2012

This paper investigates the problem of the robust fault detection (RFD) observer design for linear uncertain systems with the aid of the H_ index and the H∞ norm, which are used to describe the problem of this observer design as optimization problems. Conditions for the existence of such a fault detection observer are given in terms of matrix inequalities. RFD problem with structured uncertainties in the system matrices is also considered. The solution is obtained by an iterative linear matrix inequality (ILMI) algorithm. Numerical example is employed to demonstrate the effectiveness of the proposed methods.
Design and Implementation of a Kind of Redundant Control Computer Based on CPCI Bus
Authors: Yin Zhen Xing , Guo Feng , Wu Liang
Published: July 2012

This paper proposes new approaches to a kind of redundant design method to control computers based on CPCI bus, which discusses the choice of redundancy model and system principle. The reliability design is the key element of the system design, as the requirement for high reliability of general users to control computer system. It introduces in detail the interlocking theory and design method, the switching control circuit design and the data sharing model. In the end we conduct reliability analysis on the redundant control computer system from the aspect of the mean time between failures (MTBF) and availability. The redundant design approach effectively improves the reliability of the control computer system, and test and application prove that the control computer can meet the requirement for reliability.
Stability Analysis for Linear Systems with Time-Varying Delay
Authors: Cheng Li Hui , Shang Zhan Lei
Published: July 2012

This paper studies the problem of stability analysis for continuous-time delay systems. By introducing a free weighting parameter, combining a novel Lyapunov functional with the switching system method, a new delay-dependent sufficient stability condition is obtained in terms of a linear matrix inequality (LMI). It is shown that this new criterion can provide less conservative results than all existing ones. Numerical examples are given to illustrate the effectiveness and advantages of the proposed method.
Study of Safety Influence Factor of Bridge Substructure in Loess Gulch
Authors: Wei Jin , Feng Zhong Ju , Ma Feng
Published: July 2012

In this paper, the geology characteristics of loess gulch area were summarized. The mechanical models of the influence of landslide, debris flow and soil erosion on the safety of the pile foundation were created. The influence of the geology casualty on the safety of the pile foundation were analyzed. The analyses showed, when the pile foundation located the varied position of the loess gulch, the influence of soil erosion on the pile foundation character (acting force of pile side, free length of the pile, the first zero point position of the flexure curve, drawdown of the maximum bending moment, the increment of the lateral displacement, the drawdown of the lateral bearing capacity, the drawdown of the stability, etc.) were strikingly different. The calculation method of the pile and pier internal force was put forward under the function of landslide thrust and pressing force of debris flow. The corresponding prevention measures to different influencing factors were presented in the end.
Design and Realization of Organic Viticulture Monitoring System Based on WSN
Authors: Sun Xiang , Wu Hua Rui , Zhu Hua Ji
Published: July 2012

According to the demands of organic viticulture for small environment regulation and management automation, a grape production monitoring system based on wireless sensor networks (WSN for short) was designed, so as to solve the low management automation level, great workload and other problems that exist in traditional viticulture. The system includes a WSN and a planting management-oriented viticulture management system. The WSN consists of twelve environment monitoring nodes equipped with 168 sensors and 12 video capture cards, a sink node and a monitoring center. And it is also free to customize the functions of acquisition, processing, transmission and storage the data, such as soil moisture, soil temperature, air temperature and humidity, rainfall, solar radiation, wind direction, wind speed and so on. The communication between two nodes follows ZigBee protocol. GPRS is used to realize the communication between sink node and monitoring center. Production data collection and analysis, farming management, production decision, insect pest and disease warming are also achieved through GPRS. An experiment on data package transfer rate in grape veraison and mature stages is carried out. Six out of ten sensor nodes have transfer accuracy above 90%, and two below 35%. The reason is that the solar power supply circuit of one node has excessive energy consumption, and deployment location of the other node is influenced by environment which leads to the network instability. Through analysis, results can be got that the power supply and network environment are important factors for performance of WSN in the fields. The design and development of this viticulture monitoring system provide an effective tool for the production information monitoring and analysis decision of organic vineyard.
Output Feedback Stabilization Based on General Solution of Matrix Equation
Authors: Shi Hai Bin , Qi Li
Published: July 2012

This paper gives a method for static output feedback stabilization of linear time invariant systems. A general solution of a matrix equation concerning system parameter matrices is used to construct a state coordinate transformation. Then, the closed-loop system is equivalent to a transitional form, whose pivotal isolated subsystem can be stabilized via a gain matrix. This gain matrix is the free variable of the general solution. Furthermore, using this general solution of the matrix equation, the original problem is reformulated to a low dimension system, which can be easily solved. Numerical example is given to illustrate the validity of the proposed algorithm.
Regional Pole Placement via Static Output Feedback Based on Coordinate Transformation
Authors: Shi Hai Bin , Qi Li
Published: July 2012

This paper focuses on the regional pole placement via static output feedback. Under proper state coordinate transformation with a free matrix variable, the static output feedback gain may be obtained by solving a linear matrix inequality (LMI). The LMI is feasible only if the poles of a dummy control system are in the given LMI region. The free matrix variable can regulate the dummy system as a state feedback gain matrix. So once the free variable is determined, the static output feedback gain matrix may be obtained by an LMI-based method. The main computations do not concern any reduction or enlargement of matrix inequalities. Numerical examples show the effectiveness of the proposed algorithm.
Research on Dual-Robot Synchronous Control of Aircraft Flexible Tooling System with Fuzzy Sliding Mode Control
Authors: Zhan Li Xin , Zhou Kai
Published: July 2012

In order to achieve high-precision synchronous motion control of dual-robot in a robotic aircraft flexible tooling system, a cross-coupling method based on fuzzy sliding mode control (FSMC) is proposed in this paper. First, the dynamic model of the dual-robot drive system is established. Then, a cross-coupling scheme with FSMC is developed, in which fuzzy logic control is used to generate the hitting control signal. The stability of the system is guaranteed in the sense of the Lyapunov stability theorem. Finally, simulation results compared with the conventional PID control are given to indicate that the control performance of the dual-robot system is satisfactory and the proposed scheme can achieve preferable synchronous performance and it is robust with regard to uncertainties and disturbances.
Research and Development of Engine-Generator Set Control System for Tracked Vehicle Electric Transmission System
Authors: Zhao Ke , He Song Bai , Huang Qi Zhi , Zhang Liang
Published: July 2012

As an energy generating equipment, the engine-generator set supplies power to the electric transmission. Therefore, its control is one of the key technologies of electric vehicles. Based on the discussion about the demands to the engine-generator set in tracked vehicles, the detailed function of engine-generator and the contro1 strategy are determined. The hardware and software of the control system are also developed and tested in a prototype vehicle. The experiment results show that the control system has good reliability and can satisfy the power requirements of vehicles under all operating conditions.
A Method of Policy Conflict Detection Based on SWRL Rules
Authors: Zhou Jie , Shen Qing Guo , Xu Yu Dong , Yu Zhen Wei
Published: July 2012

Policy-based management technology which is used for managing enterprise-wide networks and distributed systems is getting more and more attention. Policy conflict detection and solution is a difficulty in this field. In this paper, we present a novel method of policy conflict detection based on SWRL rules. First, we construct a policy ontology model, and represent the policies with Web Ontology Language (OWL). Then the SWRL rules used to detect conflict is presented. Finally, an example is shown to illustrate how to use our method to detection the conflicts in the managed system, the feasibility and the validity of our proposed method are proved out.
Parameter Optimization of PID Controller for Boiler Combustion System by Applying Adaptive Immune Genetic Algorithm
Authors: Xiang Fei , Li Shan
Published: July 2012

For power plant boiler combustion control system has large inertia, nonlinear and other complex characteristics, a control algorithm of PID optimized by means of adaptive immune genetic algorithm is presented. A variety of improved schemes of GA were designed, include: initial population generating scheme, fitness function design scheme, immunization strategy, adaptive crossover probability and adaptive mutation probability design scheme. By taking the rise time, error integral and overshoot of system response as the performance index, and using genetic algorithm for real-coded of PID parameters, then a group of optimal values were obtained. Simulation results show that the method has a good dynamic performance, superior to the conventional PID controller.
Analysis and Prediction for the Chaotic Characteristic of Phase Difference VLF
Authors: Tan Tan
Published: July 2012

By analyzing the nonlinear characteristic of phase difference of receiving VLF signal in Xinxiang. Research on it's chaotic characteristic and probability of predicting it take advantage of the chaotic theory. The numerical results show that the phase difference of propagation has chaotic characteristic on the position that has specified latitude and longitude. Predicting the phase difference by using the method that based on the lyapunov exponent. The standard deviation and variance of Prediction results are 1.6240 cec and 2.6375 cec, respectively.
Engine Fault Diagnosis Based on Support Vector Machine and Noise Analysis
Authors: Xu Gao Huan , Ye Jun Xiang
Published: July 2012

Engine is a core component. It’s performance is important to the production safety, it will affect production efficiency. At the conclusion of other types of fault diagnosis method, proposed the engine fault diagnosis technology is based on SVM and noise analysis and do some pilot studies. The method can be used to early diagnosis, and can quickly and easily find fault.
Application of GPC Algorithm Based on Network Delay
Authors: Feng Zhen , Liu Jia , Xiong Jing Jing
Published: July 2012

Aiming at the problem of the network delay, this paper presents a kind of application of generalized predictive control algorithm in networked control systems. The algorithm applys future control signal predicted by MPC (model predictive control) to compensating for the delay or interruption in forward channel, and the delay in feedback channel with a predictor at the same time. The paper describes the control characteristic and discusses the stability of network control system, and verificates the algorithm's feasible and effective characteristics in networked control systems through the simulation.
Design of a New GPS-Based Automatic Sun Tracking Control System
Authors: Li Hong Yan , Liu Zhe
Published: July 2012

A key issue of the solar system is how to determine real-time position of the sun. This paper describes a new solar lighting system. The system uses a new GPS-based solar tracking control module. A Global Positioning System (GPS) is used to acquire latitude, longitude and the current time of the observation point. Single Chip Microcomputer Atmega168 is used to calculate the elevation angle and azimuth of the sun at this time, and to control the stepper motor rotating pan-tilt.. Using the angular position detector as a calibration device, the control system achieves accurate tracking of the sun, and is calibrated to achieve 0.5°accuracy.
The Nonlinear PID Control for Beam Magnetic Suspension System of Gantry-Moving Type Numerically Controlled Machine Tool
Authors: Liu Chun Fang , Zang Bin , Wang Tong
Published: July 2012

The maglev system is a typical nonlinear system, it is difficult to get the best control effect only by nonlinear control method. At first, the maglev system is linearized in this paper, for the classic PID control magnetic levitation system which exists the contradiction between fast and overshoot .This paper adopts the nonlinear tracking-differentiator-based PID controller to control the maglev system. Finally simulation results show that the nonlinear PID controller has fast response speed, no overshoot, and strong robustness in controlling the maglev system.
Preparation of Electrodeposited Ni-CNTs Nanocomposite Coatings with Highly Wear and Corrosion Resistance Properties
Authors: Shao W. , Nabb D. , Renevier N. , Sherrington I. , Luo J.K.
Published: July 2012

Ni-carbon nanotubes nanocomposite coatings were obtained from a Watts bath containing uniformly dispersed carbon nanotubes (CNTs). The surface morphology was investigated by the SEM images of coatings. The mechanical property and corrosion resistance of the nanocomposite coatings were investigated. This study revealed these CNTs reinforced Ni nanocoatings have improved mechanical and corrosion property.
The Solvent Influent on the Properties of TiO2: V4+ Nanoparticles Prepared by Hydrothermal Method
Authors: Thuy Nguyen Minh , Van Duong Quoc , Hai Le Thi Hong , Nghia Nguyen Manh , Quan Nguyen Hong
Published: July 2012

TiO2and Vanadium doped TiO2nanoparticles were synthesized by hydrothermal method. The solvents are water, oleic acid, or oxalic acid, which have affected the forms and sizes of the grains in the samples. The solvent can make the spherical nanograins, or the stick form grains, what influences the photo activity of the materials. The Vanadium doped TiO2nanoparticles had identical anatase phase with average crystal size of 8-20nm. The absorption spectra of doped samples exhibited the long tailed absorption in the visible light region above 380nm. The photocatalytic activity under the irradiation of visible light was evaluated by the degradation of phenol aqueous solutions, which is one of the products from photocatalytic oxidations of benzene. The samples TiO2:0.5%V4+have visible light photocatalystic activity; after 360min under the visible irradiation the normalized concentration of phenol decreased to 9%.
Phase Sensitive Behavior and Optical Properties of Cu0.45Mn0.55O2 Nanoparticles
Authors: Javed Qurat Ul Ain , Wang Feng Ping , Rafique M. Yasir , Iqbal M. Zubair
Published: July 2012

In this work, we have reported a facile approach to fabricate the new Cu0.45Mn0.55O2 nanoparticles with novel properties. The detailed characteristic of the nanoparticles have been performed by X-Ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) analysis, transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), and UV-visible spectroscopy. HRTEM and SAED measurements point out that the nanoparticles are phase sensitive during exposure to electron beam irradiation and undergo a reversible transition from single crystal to polycrystalline. UV-visible spectrum indicates the direct band gap of 1.4eV as well as more than 80% transparency in UV region.
Clay Reinforced Hyperbranched Polyurethane Nanocomposites Based on Palm Oil Polyol as Shape Memory Materials
Authors: Ali Ernie Suzana , Zubir Syazana Ahmad , Sahrim Ahmad
Published: July 2012

Reactive nanoclay reinforced hyperbranched polyurethane (HPU) nanocomposites have been synthesized with the introduction of palm oil polyol as part of the precursor. The HPU were prepared in a two-step process using polycaprolactonediol, 4,4’-diphenylmethane diisocyanate and 1,4-butanediol as chain extender. Nanoclay was added with the purpose of improving the properties of the pristine polyurethane. The introduction of palm oil polyol is believed to enhance the mixing process between polymer matrix and filler. Thermal, mechanical and shape memory properties of produced HPU were investigated. The results showed that the crystallinity of HPU nanocomposites decreased with introduction of clay particles and that the mechanical and shape memory properties were enhanced with the addition of small amount of reactive nanoclay (up to 3 wt%).
Effects of Nano-Particles on DOP Migration and Tensile Properties of Flexible PVC Sheets
Authors: Zhou Yan Wen , Xiao Yao , Li Xi Hong , Wang Biao
Published: July 2012

The effects of nano-particles (nano-CaCO3, nano-SiO2 and MMT modified by organic modifier) on DOP migration and tensile properties of flexible PVC sheets were studied. Nano-particles can hinder DOP migration from PVC matrix. And the anti-migration properties of PVC samples were different due to the processing time. The DOP migration of PVC samples with the addition of 5 phr MMT and being processed for 8 min was the lowest. Tensile properties of PVC samples changes with the increasing content of nano-particles and processing time. And the dispersing of nano-particles in PVC matrix needed to be solved in further study.
Bioactive Porous Silica Ceramics Prepared Using Rice Husk Ash by Gelcasting Method
Authors: Nayak Jyoti Prakash , Bera Japes
Published: July 2012

Silica-based porous bioactive ceramics was prepared by gel-casting method using silica xerogel powder. Xerogel was derived from rice husk ash. 42 vol.% solid containing slurry was prepared in 1:30 (MBAM:AM) monomer cross-linker solution. The srurry was thixotropic. Gel-casted body was machined efficiently. Dired cast body was sintered at 1100oC. Apatite layer was formed on silica body during In vitro bioactivity experiment. The results suggest that the gel-casted silica ceramics can be used as a bioceramics.