bluuebunny/crossref_metadata_2025 huggingface dataset:
Development of Road Traffic Safety Education System Based on Virtual Reality Technology
Authors: Jiao Xue Jian , Chai Shan
Published: November 2012

Road traffic safety is a major security problem faced by our society. It has great significance for the society to give the driver a safety education in the totally immersed virtual reality environment. With the single channel stereo display projection system, we established the road traffic safety education system, and solved some key issues, such as the physical modeling of immersive driving experience, the vehicle dynamics simulation and so on. Practical application shows that the system has achieved the purpose of road traffic safety education.
Numerical Simulation of Yarn Untwisting Mechanism in a Pneumatic Splicer Process
Authors: Xing Xiao , Ye Guo Ming
Published: November 2012

For better study of the airflow movement in the untwisting chamber of a pneumatic splicer, this paper uses a commercial computational fluid dynamics software FLUENT to realize the three dimensional numerical simulation for the characteristic of the airflows in the untwisting chamber. A three-dimensional grid and the realizable k- ε tur¬bulence model are used in this simulation. The characteristics of the air flows in different parts of the chamber are analysed according to the computed result. The airflow in the untwisting chamber can be divided into three regions in longitudinal section and two regions in cross section.
The Numerical Simulation Research of Spiral Solid-Liquid Separators
Authors: Yan Yue Juan , Wang Zun Ce , Li Sen , Yan Xu
Published: November 2012

In water production-reinjection system, a spiral solid-liquid separator is installed at the inlet of the electric submersible pump (ESP) to prevent solid materials in the re-injected water from plugging formation pore and keep the efficiency of water injection. In order to determine optimum structural parameters and operating parameters of the separator, numerical simulation was conducted to analysis the effect of spiral laps, spiral pitch, inlet velocity, etc. on separation properties. By analysis and comparison, spiral laps of 5, pitch of 18 mm are the most suitable structure parameters. In operating parameters, the pressure drop and separation efficiency increase with the inlet velocity increasing. The results provide reference for further research of the spiral solid-liquid separators.
Energy Difference Based Speech Segregation for Close-Talk System
Authors: Zhou Hong , Jiang Yi , Jiang Ming , Chen Qiang
Published: November 2012

Within the framework of computational auditory scene analysis (CASA), a speech separation algorithm based on energy difference for close-talk system was proposed. The two microphones received the mixture signal of close target speech and far noise sound at the same time. The inter-microphone intensity differences (IMID) of the two microphones in time-frequency (T-F) units were calculated. And used as cues to generate the binary masks with the K-means two class clustering method. Experiments indicated that this novel algorithm could separate the target speech from the mixture sound, and performed well in a big noise environment.
Research on Fast Localization Algorithm of Low-Quality License Plate Images
Authors: Song Ren Jie , Xie Wen Wen
Published: November 2012

This article introduces a vehicle license plate localization method which is based on gray image. This method mainly processes some uneven illumination and low-quality vehicle images. Firstly it uses edge detection operators to enhance images to plate region. Then it enhances with algorithm such as binaryzation, first-order points difference and median filtering in custom templates. And lastly it makes it more accurately in license plate localization through projection method enhancement. It is showed in experiments that this method can license plate localizes these kinds of low-quality license plate images accurately and effectively.
Self-Tuning Fusion Kalman Filter for ARMA Signals
Authors: Liu Wen Qiang , Han Na , Yan Man , Tao Gui Li
Published: November 2012

For the single-channel autoregressive moving average (ARMA) signals with multisensor, and with unknown model parameters and noise variances, the local estimators of unknown model parameters and noise variances are obtained by the recursive instrumental variable (RIV) algorithm and correlation method, and the fused estimators are obtained by taking the average of the local estimators. Substituting them into the optimal fusion Kalman filter, a self-tuning fusion Kalman filter for single-channel ARMA signals is presented. A simulation example shows its effectiveness.
Seismic Signal Wavelet-Packet Denoising and Fast Spectrum Analysis
Authors: Liu Shu Cong , Gao Er Gen , Guo Chun Sheng
Published: November 2012

Noise mixed in the recorded seismic signals often affects the data analysis result. To solve this problem, wavelet packet decomposition technology is selected to reduce the noise. The principle, denoising steps and algorithm of wavelet packet decomposition technology are introduced with its effectiveness and reliability verified by computer simulation. Meanwhile, split-radix FFT algorithm is used to rapidly perform spectral analysis for seismic signals. Compared with radix-2 FFT and radix-4 FFT, split-radix algorithm can significantly reduce calculation amount and improve the speed of data analysis. Field tests showed that wavelet packet denoising technology and split-radix FFT algorithm have good effect.
Study on Transformer Silicon Steel Magnetic of Different Joint Forms
Authors: Bai Bao Dong , Zhang Bo , Chen De Zhi , Jia Wu Hao , Qu Bing Yin
Published: November 2012

The operation characteristic of transformer when DC bias phenomenon occurred was detected by Epstein frame. Results with different methods of joint forms are obtained in this paper. The circuit structure and measuring principle were analyzed in detail. Average magnetizing curve, magnetic hysteresis loop and loss curve with joint forms method of full tap and 30°,60° tap were obtained. The theoretical basis and experimental evidence for improving the capacity on restraining DC bias during designing transformer are provided.
Simulation on Parameters Temperature Field by Gas-Solid Coupling in Goaf
Authors: Wang Yue Hong , Qin Yue Ping , Zhang Jiu Ling , Wen Jia Li
Published: November 2012

For solution the complex and rapidly changing question of temperature field in mining goaf, the simulation on dynamic temperature field of parameters coupling is carried out under different working coditions based on high-efficiency finite volume method (FVM) and the moving characteristic of working face. The theory analysis, the laboratory experiment, the simulation of software and the example confirmation, above all methods are used in order to find the change of temperature field in goaf. The result is found that there has spontaneous combustion in goaf when the moving speed of working face is below 1.2m/d; besides that the temperature in goaf fall and the high-temperature region is extend to the deep of goaf. Another result is exist that there has the linear increase relationship of the intensity of leak air and the temperature in goaf, and the high-temperature region is extend to the deep of goaf contrary to the effect of the coal oxidation properties, which increases the risk of coal spontaneous combustion in goaf. Especially , all the data of temperature is visualization by picture of 3D, so the distribution map of temperature in goaf is visualized distinctly. The research results provide a theoretical basis for understanding the real situation and preventing spontaneous combustion in goaf.
The Evaluation and Algorithm of CNC Machine Tool Module Combination Configuration Program
Authors: Sheng Zhong Qi , Liu Chang Chun , Dai Sheng Li , Liu Yu Chang
Published: November 2012

Modular design is an effective design concept and method that adapts to fierce market competition and versatile customer requirement. Solving the key questions in applying modular design method is the important research topic of modern CAD technology. This paper studies the evaluation question of module combination program, and puts forward the evaluation model for CNC machine tool product. Analytic hierarchy process is used as the evaluation algorithm of combination program. The actual evaluation is carried out to verify the model and algorithm.
Image Restoration Method Based on Pre-Filtering for Cone-Beam Computed Tomography
Authors: Zhang Hua , Shi Yi Kai , Huang Kui Dong , Yu Qing Chao
Published: November 2012

For the problem of image quality degradation of cone-beam Computed Tomography (CBCT) based on flat panel detector (FPD), a constrained least squares iteration (CLSI) restoration method based on pre-filtering is proposed. Firstly, the original projected images are denoised with bilateral filtering algorithm. Then, the denoised projected images are restored with CLSI. Finally, the final restored images are obtained by adding the noise images, which got by subtracting the projected images before and after denoising, to the restored images. The experimental results show that the method well inhibits the noise amplification phenomenon in image restoration, and increases the edge sharpness and contrast-to-noise ratio (CNR) of the projected images and slice images. The CBCT image quality is significantly improved with this method.
A Mutation Ant Colony Algorithm for the Generalized Assignment Problem under the Special Constraints
Authors: Guo Yun Hua , Shi De Qian
Published: November 2012

A generalized assignment problem under the special constraints is proposed, which can be solved by the ant colony algorithm (ACA). But the ACA for the problem is easy to fall in local optima because the constraints are relatively complicated. In this paper, the diversity in the results is maintained and the convergent speed is elevated by an adaptive method of updating pheromone and a mutation strategy for clearing up invalid assignment. The computer experiments demonstrate that the optimization performance is improved by the proposed algorithm, which is more suitable for the real-time application.
Query Optimization Based on the Simulated Annealing and Particle Swarm Optimization
Authors: Song Ren Jie , Wang Yan
Published: November 2012

In order to allow the user to quickly and accurately search the required information, a query optimization method based on a simulated annealing and particle swarm hybrid algorithm is proposed. The basic idea is: the query population into two flat sub populations, a sub population by using simulated annealing algorithm optimization, another sub populations by using particle swarm algorithm optimization, comparison of two adaptive values, to find the global optimal value. The experimental results show that the mixed algorithm, can further improve the precision and recall of query optimization.
Application of Differential Evolution Algorithm for Calibrating Design Seismic Response Spectra
Authors: Lan Jing Yan , Lu Yue Jun
Published: November 2012

Differential evolution (DE) algorithm is a heuristic approach that has a great ability to solve complex optimization and converges faster and with more certainty than many other acclaimed global optimization methods. In this paper, DE algorithm is applied to calibrate design seismic response spectra, the basic idea is that design response spectra and calculated response spectra are defined as objective function of characteristic parameters, the first turning point, the second turning point (characteristic period), the platform height and the attenuation index, of design response spectra, and the characteristic parameters are obtained by minimizing the objective function. Three pieces of the calculated response spectra for one real are calibrated as an application example. The obtained results demonstrate the effectiveness and efficiency of the proposed method.
Optimized Spatial Query for Data Integration Based on Semantics
Authors: Qian Shen Yi , Zhu Hao Dong
Published: November 2012

Data integration of geospatial data in distributed, heterogeneous environment involves the use of semantic ontologies. In this kind of integration system, semantic technologies play an important role in improving performance and effectiveness of spatial queries. This paper focuses on methods of query optimization based on spatial semantics at the top level of semantic layer in central data integration systems. After analyzing the hybrid approach for spatial data integration, two categories of query optimization strategies are proposed based on detailed examination of special characteristics of spatial data. With spatial knowledge explicitly specified in ontologies and associated rules, spatial queries can be optimized intelligently.
A Mathematical Model of Single Grain Forces in Grinding Process
Authors: Jiang Jing Liang , Ge Pei Qi , Zhang Ying , Wang De Xiang
Published: November 2012

For the purpose of obtaining mathematical force model in grinding process, the contacting grain numbers and the single grain forces should be taken into considered. In this paper, a mathematical model was established for single grain forces calculation. A Matlab program is edited and the calculation results were obtained and discussed. In the work of this paper, only plowing and cutting forces were take into considered because that the sliding forces were proved to be neglected based on Hertz contact theory. Because of different micro-interacting mechanisms of plowing and cutting grains with workpiece material, different force models were developed separately.
Adaptive Time Delay Estimation Based on Robust Cyclic Correlation Estimator
Authors: Guo Ying , Meng Cai Yun
Published: November 2012

Based on the proposed efficient cyclic correlation estimator by exploiting normalized infinite norm, this paper develops a robust adaptive time delay estimation method which provides additional robustness against heavy-tailed noise and when the noise statistics are not fully known. Simulations demonstrate the reliable and robust performance of the proposed cyclic correlation estimator and its corresponding time delay estimation algorithm.
The Research of Digltal CR Medicine Image Adapitive Enhancement Method
Authors: Zhang Ming Hui , Zhang Yao Yu
Published: November 2012

Digital CR medicine radiation image is in doctor’s favor and has became medicine imaging technology new hot spot because of its high gray contrast、powerful computer disposal function、little radiation dosage、non-film diagnosis、different area consultation. But degradation of digital X-ray medical image such as low contrast and blurring during radiographic imaging, caused by complexity of body tissue and effects of X-ray scattering and electrical noise etc., can worsen the results of analysis and diagnosis. So it is usually needed that CR medicine image is enhanced to improve its vision quality, and easy to doctor’s more accurate diagnosis. The general enhancement algorithms over enhancing the contrast and lose image details, aiming at the defects, an enhancement algorithm for CR image is proposed based on the ratio of deviation to mean of domain. The arithmetic enhance CR image edge details by adjusting factor K based on the ratio of deviation to mean of domain of CR image. Experiment results demonstrate that the algorithm enhances CR image detail and CR image enhanced has good visual effect, the adaptive enhancement method is fit for CR medicine image.
Research on Distributed Resource Management System for Product Design
Authors: Wang Sheng Fa , Pan Min
Published: November 2012

Resource plays an important role for product design. In order to manage distributed and ocean resource for product design in an open and dynamic interconnection environment, resource integration framework is proposed. Resource depicted through matrix is presented in resource space. The matrix description, combination, integration, semantic reasoning and semantic search on resource are studied. According to resource space model, a fuzzy decision-based method is proposed to decide which resource is the most optimal. Finally, an example on product design of eddy current retarder is given to testify the validity of distributed resource management for product design.
Simulation Study on Energy Feedback for Flame-Proof Integrative Variable-Frequency Motor
Authors: Bai Bao Dong , Jia Wu Hao , Chen De Zhi , Wang Xin Bo
Published: November 2012

In order to meet mechanical mining demand of China's thin coal seaming, the power electronics and motor control system in hardware and software integration is presented, which replace traditional variable-frequency system applied to mining, planning and transport occasions. Solving braking resistor large volume and heat dissipation problem of the variable frequency system is very necessary. Accordingly, energy feedback based on fuzzy PI control type system to replace the traditional energy consumption braking was designed in this paper. Through the system simulation, it is shown that this system has high power factor, small feed current harmonics and effectively absorb the feedback energy, especially can realize four quadrant operations.
Avionics System Simulation of General Aviation Aircraft Based on HLA
Authors: Qi Zhen Tao , Zhang Xue Jun , Han Dong
Published: November 2012

Simulation is an effective means for system development. A simulation system of the General aviation (GA) avionics using HLA is designed in this paper. The design and implementation process of federates is also described, taking the Cockpit Display federate as an example. The system has good interoperability, reusability and scalability, which meet the requirements of avionics simulation. The system can be widely used in GA avionics design and the training of pilots.
Numerical Calculation for Complex Transcendental Equation
Authors: Sun Tie Lin , Sun Hui
Published: November 2012

The traditional method to calculate complex transcendental equation is poor, which can't meet requirements of calculating imaginary answer and fast calculation at the same time. This paper proposes "modified dichotomy method" through modifying the classical dichotomy method to solve complex transcendental equation, that can not only calculates imaginary answer but also calculates fast. Algorithm is also verified through comparing with the answer to lamb wave dispersion equation in elastic plate.
Log Secure Access and Transmission Technology Research in a Virtual Environment
Authors: Wang Xin Peng , Wang Wei Jie
Published: November 2012

This paper puts forward a logging process monitoring method based on full virtualization to solve the problems of log lost and non security log transmission. Making use of fully virtualized technology, this method detects the suspicious log in the virtual monitor machine and makes record of logs. It used SSL technology to transmit log to the remote backup machine to save and analyze it.
PWM Component Design Based on Avalon Specification
Authors: Zheng Gong Ming , Zhang Hai
Published: November 2012

It could improve the design efficiency and shorten the development cycle by the means of integrating various user-defined peripheral driver in the rule of Avalon bus in the SOPC system. The PWM component with adjusted period and duty ratio has been achieved with hardware and software co-design method according to the Avalon bus specification in Nios Ⅱ embedded systems, and it had been tested to meet the application requirements completely
Research on Three-Dimensional Mechanical Model Exhibitation System Based on WebGIS
Authors: Zhang Li Guo , Fan Jin Ling , Shi Guang Yi
Published: November 2012

On the basis of the analysis on the development environment and development key technologies, Three-dimensional mechanical model exhibitation system based Google Map API was developed, which achieves uniform management of 3D model data, 3D model browsing, information query, online assembly, model download and can support multi-sited collaborative simulation. By using local search service and existing landmark file of Google Map and adding self-defined landmarks list, it realized fast retrieval, precise positioning and regional analysis of model supplier. Taking into account the system maintainability, scalability and security issues, it makes the design resources to be maximize shared and has certain practicability.
Numerical Simulation of Impact Tension for Mooring Cable of Underwater Monitoring Platform
Authors: He Kong De , Fang Zi Fan , Zhang Yi , Yang Wei Hua
Published: November 2012

The dynamical model of underwater monitoring platform is formulated aimed at the dynamical response by the action of flow force, based on Hopkinson impact load theory, taken into account the catenoid effect of mooring cable and revised the difference of tension and tangential direction action force by equivalent modulus of elasticity. And solved the equation by hydraulics theory and structural mechanics theory of oceaneering, studied the action force characteristic of mooring cable and motion characteristic of buoy. Through the result the conclusion can be got the buoy will engender biggish heave and swaying displacement, but the swaying displacement got stable quickly and the heaven displacement got vibration for the vortex-induced action by the flow; because the vortex-induced action and the impact action between buoy and the mooring cable, the tension made great changes when the mooring cable was Relaxation-tension.
Analysis of LDMOS for Effect of Fingers, Device-Width and Inductance (Load) on Reverse Recovery
Authors: Anwar Mohammed Sadique , Permata Prima Sukma , Siddiqui Md. Imran , Tsai Jung Ruey , Yang Shao Ming , Sheu Gene
Published: November 2012

This work demonstrates the effect of fingers, device-width and inductance on reverse recovery of LDMOS by unclamped inductive switching (UIS) circuit simulation for two dimensional (2D) and three dimensional (3D) devices. All the observations have been done for maximum pulse width at which device pass under UIS test. For UIS simulations the failure criteria is taken as the device temperature reaching a critical value of 650K. It has been shown that reverse recovery charge (Qrr) increased linearly with number of fingers, device width and inductance.
Numerical Investigation of Turbulence Models for Free Jet Flow
Authors: Laribi Boualem , Belkacemi Djelloul , Abdellah Hadj
Published: November 2012

The turbulent jets with swirl are of particularly significant and practical interest in various fields of industry. The present numerical study concerns the comparison between three models of turbulence for the forecast of a turbulent free axi-symmetric jet with turbulence and his development. The software used was CFD code Fluent with his three turbulence models namely k-, k- and RSM. This different turbulence models are tested to better simulate and view the effectiveness of models in the description of the jet behaviour. The parameters of flow examined are the velocity profile of jet at Reynolds number of 22000. Comparisons between numerical predictions and experimental measurements taken from the technical literature for the case of natural jet development show that the numerical techniques of Computational Fluid Dynamics are an important tool for studying the jet’s behaviour. The results indicate that the RSM models is higher than the k- and k- models when looking at changes in velocity profile behaviour towards experimental profile, the k- model can be used for predicting re-circulating flows if we are interested in global settings only. The prediction obtained by k- model is far from experimental results. It is misadvised to use k- model for the jets analysis. The better numerical results were obtained by CFD code CFX, where results are in good agreement with the experimental results.
Experimental and Numerical Investigation on Flowfield of Film Cooling from Multiple Holes
Authors: Abdullah Kamil , Funazaki Ken Ichi , Onodera Hisato
Published: November 2012

This paper presents the experimental and numerical investigation on flowfield of multiple film cooling hole focuses on shallow hole angle at 20°. An in-line hole configuration consist of 20 cooling holes have been considered in the present study. Investigation have been carried out at ReD=6,200 and BR=1.0 with the experimental investigation involves 3D-LDV device to capture the experimental velocity flowfield. The numerical investigation was carried out through RANS analyses with the employment of shear stress transport turbulent model. The results highlights the benefit of shallow hole angle configuration with good agreements have been achieved between the experimental and the numerical results.
Doping Effect on Crystal Structure and Magnetic Properties of Highly Al-Substituted Strontium Hexaferrite Nanoparticles
Authors: Khorashadizade Elham , Arabi Hadi , Yousefi Abbas
Published: November 2012

M-type strontium hexaferrites with substitution of Fe3+ by Al3+, according to the formula SrAlxFe12-xO19 (x=0, 1, 2, 3, 4, 6, 8, 10), are prepared by the sol-gel auto-combustion method. Influences of the substituted amount of Al3+ on structure and magnetic properties of SrAlxFe12-xO19 compounds have systematically been investigated by XRD, TEM and VSM. X-ray diffraction shows that the samples are single M-type hexagonal ferrites. Because of the resemblance of Al3+ ionic radii with Fe3+ the two ions are easily replaced at any substitution ratio without changing the crystal structure. The materials show structural and morphology changes upon replacement of iron by aluminum. A shift in peak position to larger angles shown by XRD is observable with increasing aluminum doping. The values of Ms, Mr and Hc decrease with the addition of Al content but there is an exception for x=3 when Hc=8.9 KOe.
Modeling and Simulation of System Dynamics for Spacecraft Propulsion System
Authors: Yan Zheng , Peng Xiao Hui , Cheng Yu Qiang , Wu Jian Jun
Published: November 2012

The spacecraft propulsion system is used for geosynchronous orbit transfer, three-axis stabilization and station-keeping. In order to investigate the system dynamics of spacecraft propulsion system with complex pressurization pipelines and propellant supply pipelines, a modular and extensible simulator UPSSim was developed. The pressurant pipelines were separated into several nodes, each node used lumped parameter model; while the propellant feed pipelines used distributed parameter model. Heat transfer between components and environment was also taken into account. The model accurately predicts the transient behavior of the spacecraft propulsion system during start-up and shutdown process, as well as the effect of pipe initial pressure on the priming waterhammer amplitude. The simulation result demonstrates the adequacy of the modular modeling methodology for spacecraft propulsion system dynamic simulation.
Identification of MR Damper Based on Normalized Bouc-Wen Model Using Neural Network
Authors: Bahar Arash , Chaibakhsh Ali , Haqdadi Sajad
Published: November 2012

The Magneto-rheological (MR) dampers are favorite mechanical system in dynamic structures. This paper presents an application of Wiener-type nonlinear models for describing the hysteresis behaviors of MR dampers at different operating conditions. In this structure, a linear part consisting discrete-time Kautz filters is cascading by a nonlinear mapping function (feedforward neural network (FFNN)). The pole parameters of Kautz filters were chosen with respect to the poles of best fitted linear model on real system. By defining the parameters of Kautz filter, the nonlinear behaviors of system were identified using neural network model, as the output of filters were considered as the output on NN. In order to assess the performances of the developed models a comparison between the responses of the models and another recent modeling approach was preformed.
Explicit Dynamic Simulation of High Density Polyethylene Beam under Flexural Loading Condition
Authors: Khalajmasoumi M. , Koloor S.S.R. , Arefnia A. , Ibrahim I.S. , Yatim J. Mohd
Published: November 2012

Improve stability and reliability of machine components has confirmed the necessary needs of using advance materials such as polymers and composites. Specific characterization of polymer materials can improve the altitude of products design by increasing the mechanical feature of structures such as high fatigue strength, longer life and etc. Polymers are known as hyperelastic materials with a complicated mechanical behaviour. An acceptable mechanical analysis of three dimensional (3D) polymer structures depends on a true understanding of applied model on computational methods such as Finite Element Method (FEM). This study focused on stress and deformation analysis of 3D polyethylene polymer panel under three-point bending test using FEM. Explicit dynamic procedure has been used to examine the mechanical behaviour of polymer beam. Two tests of tension and compression is performed on polymer specimens to extract the material properties and used in finite element model. The specimen panel selected thick enough to generate two complicated situation of tension and compression zone while it is under bending load condition. The test was performed to extract the actual response of the specimen by plotting the force-deflection curve and stiffness of structure. The experimental data confirmed well the simulation results and states the accuracy of the analysis process. A discussion is given on effective stress and deformation generated in the polymer panel. A Complex deformation observed at the middle of specimen behind loadcell, that signifying the effect of geometry and boundary condition with respect to hyperelestic behaviour of polyethylene. The computational procedure is recommended for mechanical analysis of polymer structures due to the capability of the model for accurate prediction of hyperelastic behaviour.
PSO-Based State Feedback Control of Flexible Spacecraft for Attitude Tracking and Vibration Suppression
Authors: Yu Ya Nan , Meng Xiu Yun , Ma Li Chao
Published: November 2012

PD state-feedback controller has been adopted in many spacecraft for attitude tracking and presents good performance. For flexible spacecraft, the controller can be designed with a term which takes into account the flexible dynamics. However, duo to nonlinearity and coupling, how to determine state-feedback control parameters which ensure fast attitude tracking and significant vibration suppression must be considered. In this paper, the dynamics model of spacecraft with flexible appendages is derived with the hybrid coordinate method and the full state feedback controller originated from the PD control algorithm is designed. A method of estimating the flexible spacecraft's controller parameters based on the particle swarm optimization (PSO) algorithm is presented. Taking the PD controller parameters as optimized variables, optimal control state is defined as the linear weighted sum of response error of all state variables is smallest with the limited actuator output moment. Simulation results show that the optimized controller obtained by PSO algorithm makes attitude of spacecraft converge quickly and elastic vibration suppressed effectively.
Sliding Mode Controller Based on Fuzzy Neural Network Optimization for FSPM
Authors: Zhang Zhi Feng , Bai Bao Dong , Zhao Guo Xin
Published: November 2012

A sliding mode controller for flux-switching permanent magnet (FSPM) motor is investigated in this paper, in which direct torque control (DTC) concept, variable structure control are integrated to achieve high performance. Then, an FNN is investigated to optimize the control gain matrix of sliding mode controller. The theoretical analyses for the proposed FNN sliding-mode controller are described in detail. Simulation results show that the proposed FNN sliding-mode controller provides low torque ripple and the chattering phenomenon is much reduced.
Discussion on the Garbage Disposal Control System Based on DCS
Authors: Xu Mei
Published: November 2012

The garbage disposal system is not a very large system,but it is a complex system..You need to take different control strategies according to different control objects, belonging to the control problem of the complexity of the uncertainty of the object (or process). Conventional control methods (such as PID, etc.) is difficult to implement effective control of such object.It is necessary to explore more effective control strategy. The paper briefly discusses the problem of intelligent control of the garbage disposal systems based on DCS.
TEM Analysis of Structural Phase Transition in MBE Grown Cubic InN on MgO (001) by MBE: Effect of Hexagonal Phase Inclusion in an C-Gan Nucleation Layer
Authors: Parinyataramas Jamreonta , Sanorpim Sakuntam , Thanachayanont Chanchana , Yaguchi Hiroyaki , Orihara Misao
Published: November 2012

In this paper, we introduced dbcube topology for Network-on Chips(NoC). We predicted the dbcube topology has high power and low latency comparing to other topologies, and in particular mesh topology. By using xmulator simulator,we compared power and latency of this topologyto mesh topology. Finally, it is demonstrated that the network has higher power and lower latency than the mesh topology.
Uncertain Chua System Chaos Synchronization Using Single Variable Feedback
Authors: Chen Feng Xiang , Zhai Shuang , Ji Guang Ji , Yu Lin Jiong , Zhou Su , Zhang Tong
Published: November 2012

This paper treats the chaos synchronization problem of uncertain chaotic Chua circuit system. Based on Lyapunov theory, the proposed controller is featured with (a) only single variable information of the master system is needed; (b) the synchronization can also be achieved whilst the parameters of the master system are perturbed. Finally, the effectiveness of the proposed control law is also illustrated by the numerical simulation on Matlab environment.
Study on Twin-Rotary Motion Control System Based on Siemens Technology CPU
Authors: Pan Cun Hai , Li Hui , Du Su Mei , Gao Wei
Published: November 2012

A twin-rotary motion control system was built based on a cam technology and Siemens S7-300T PLC in this paper. The system can position accurately in a three-dimension space using a twin-servo closed loop control system and can real-time monitor various parameters of positioning system by HMI (Human Machine Interface). It also can automatically collect various parameter information and judge the type of fault.At the same time, the degree of automation has been raised and the cost of production was reduced.
Logic-Based Switching Adaptive Control of DC-DC Buck Converter
Authors: Liu Bao Bin , Zhou Wei
Published: November 2012

Logic-based switching adaptive control scheme is proposed for the model of DC-DC buck converter in presence of uncertain parameters and power supply disturbance. All uncertain parameters and the disturbance are estimated together through constructing Lyapunov function. And a switching mechanism is used to ensure global asymptotic stability of the closed-loop system. The results of simulation show that even if there are multiple unknown parameters in the small-signal model, the control system of DC-DC buck converter can estimate unknown parameters quickly and accurately.
Control Strategy for Input-Parallel Output-Parallel DC/DC Converters with Output Current Sharing
Authors: Han Bing , Dong Ning , Mahmood Soomro Amir
Published: November 2012

This paper presents a digital control strategy for Input-Parallel Output-Parallel (IPOP) DC/DC converters system. The IPOP system is based on two phase-shifted full-bridge (PS-FB) converters whose output current is not equally shared due to parameter differences of each module. The control objective is to obtain output current equally sharing. Small signal model is built to analyze the system stability. Effectiveness of the control strategy is verified by simulation and experiment results.
Quick Motion Path Plan for Joint-Robot to Pick Tomato under Free-Obstacle
Authors: Yin Jian Jun , Xie Chun , Wu Chuan Yu , Gauri S.Mittal , Yang Simon X.
Published: November 2012

To improve the efficiency of picking the fruit, a kind of quick motion path plan method for fruit-picking robot under free-obstacle was proposed in this paper. Firstly, the method obtained a series of points along straight path at equal internal, and the gripper center was designed to pass thorough these points. Inverse kinematics formulas of the robot arm were used to solve joint angles of the robot arm when the gripper center will pass thorough each point. To make the robot arm guide the gripper to reach quickly the object point, the joint angles were optimized to determinate according to the principle of energy optimization. The test of picking tomato showed that the method can both reproduce the motion of the gripper along linear points at constant speed and keep the shortest motion path, which are benefit to grip the fruit steadily. The method has a low amount of calculation, better real-time and may provide a reference for joint robot to pick the fruit quickly.
The Research Status and Development Trend of Fault Diagnosis System for CNC Machine
Authors: Ao Mao Yao , Zhao Yan
Published: November 2012

The main research contents as well as the research status and results in fault diagnosis system for CNC Machine are reviewed, analyzed and summarized, based on the analysis of domestic and foreign literature in the field of fault diagnosis system for CNC Machine. It briefly analyzes the characteristic and applicability of Expert System, Neural Network, Fault Tree Analysis, Fuzzy Set Theory and Multi-Agent System, and points out the key technical problems which is needed to be solved in this field. Then it views the future development, and points that the fault diagnosis of integrated intelligence and remote network is the research and development trend of diagnosis system for CNC Machine.
Dispersion of Multiwalled Carbon Nanotubes with Water-Soluble Polyaniline Blend Poly(Sodium 4-Styrenesulfonate)
Authors: Detsri Ekarat , Dubas Stephan Thierry
Published: November 2012

Water-soluble polyaniline blend poly(sodium 4-styrenesulfonate), (PANI.PSS) was used to disperse multiwalled carbon nanotubes (MWCNTs) by noncovalent surface modification. The anionic of PANI.PSS solution was prepared by interfacial polymerization of aniline monomer in the presence of PSS as the blending reagent to provide water solubility. The optimal conditions to prepare stable modified MWCNTs/PANI.PSS aqueous dispersions are presented. The interaction of MWCNTs and PANI.PSS have been investigated and explained according to the result of UV-Vis spectroscopy and zeta potential analysis. The MWCNTs/PANI.PSS complex solution was further confirmed more evidence by Transmission electron microscopy (TEM). Results showed that the MWCNTs dispersed with PANI.PSS are highly dispersible in water, which open up the new possibilities for the fabrication of composite films.
Ball-Based Surface Machining System Used in Non-Contour Control
Authors: Wang Shi Huan , Zhu Lin Sen
Published: November 2012

Surface machining system based on spherical coordinate, which is used in non-contour control, is present for the thin-walled director sphere part turning, to improve the efficiency and quality of part machining. In this system, a thickness surface B-spline model is set up based on spherical coordinate, the space spiral path generation method is planned. To meet the requirement of surface quality, row spacing angle is determined by scallop height and blunt radius of cutting tool, and angle B-spline model for back cutting depth is given. Moreover, space spiral interpolation algorithm is present in CNC.
No Steady-State Error Tracking Control of Multi-Axle Steering Vehicle
Authors: Zhang Xiao Jiang , Gao Xiu Chao , Yu Lei
Published: November 2012

In order to improve the interference suppression capability for the muti-axle steering vehicle(MASV) and to reduce the design complexity of the controller , no steady-state error tracking control system was designed so that the contol system can meet the requirements of disturbance rejection and robust tracking. Using the no steady-state error tracking control strategy to the MASV, it can track reference signal perfectly. Its yaw angular velocity, sidesip angle and rolling angle are degraded at high vehicle speed. The stability and driving safety of the vehicle are improved. According to actual needs, the Parameter of the controller can be changed through the different characteristic value; The design and adjustment of the controller are simple amd easy.
The Implementation of the Air Jet Loom High-Precision Weft Insertion Control System Based on FPGA
Authors: Yu Rui Hong , Li Yan Qin , Li Li Xin , Li Jia Bo
Published: November 2012

With the respect of the problem of that the control precision of air jet loom weft insertion control system can not satisfy the requirement of the high-speed loom, this article presented a high-precision weft insertion control system taking FPGA as the control core, and it designed hardware circuit and software framework. This control system generates weft insertion control signal which is figured out through the parallel execution of the FPGA program. The practice shows that the system owns the features of high control precision, good consistency and so on, and it has a significant importance to the high-speed development of air jet loom.
AMPpred: An On-Line Predictor Design for Automated AMP Recognition
Authors: Pan Yu An , Xiao Xuan , Wang Pu
Published: November 2012

Antimicrobial peptides (AMP) are potent, broad spectrum antibiotics which demonstrate potential as novel therapeutic agents. Because it is both time-consuming and laborious to identify new AMPs by experiment, this paper tries to resolve this problem by pattern recognition. Two major contents included: Firstly, up to six kinds of physicochemical properties value are selected to code the AMP sequence as physical-chemical property matrix (PCM), then auto and cross covariance transformation is performed to extract features from the PCM for AMP sequence expression; Secondly, these feature vectors are input to a powerful Support Vector Machine (SVM) classifier for training and new query AMP recognition. For a newly constructed AMP benchmark dataset, the overall classification accuracy about 96% has been achieved through the rigorous Leave-One-Out cross-validation. For convenience, a user-friendly web server, AMPpred, has been established at http://icpr.jci.jx.cn/bioinfo/AMPpred. It is anticipated that this on-line predictor may become a useful bioinformatics tool for molecular biology and drug development. Also, its novel approach will further stimulate the development of predicting peptide attributes.
Welding Robot Applied in Delong Heavy Truck Weld Line
Authors: Dong Peng Min , Chen Da Yan , Shang Gen She , Dang Xiao Li , Du Guo Qing
Published: November 2012

With the development of manufacturing techniques and the size of the economy, the heavy duty truck market competition is becoming increasingly fierce. Higher requirements on the welding equipment have been forward in the present market environment. Welding robot which has been used in main welding production line of Shanxi Automobile Delong is characterized by good quality of welding seam, high productive efficiency and good flexibility. This paper summarizes useful experience and existing problem of welding robot technology in practical application.
Adaptive Control of Hyper-Chaotic Systems Based on Dynamic Structure RBF Neural Networks
Authors: Wang Jing , Gao Hong Xia , Tan Zhen Yu , Gao Jin Feng
Published: November 2012

An adaptive control scheme based on neural networks is presented for control of hyper-chaotic systems. Parameters of neural networks and controllers are adjusted automatically to ensure the stability of the closed-loop system. Numerical simulation illustrates that the proposed control scheme is valid for hyper-chaotic system.
Smart Slave Station Design of PROFIBUS-DP Based on DPC31
Authors: Chen Zai Ping , Sun Qing
Published: November 2012

The structure and function of Siemens communication protocol chip DPC31 are introduced in this paper, a development scheme of DP smart slave station based on DPC31 is proposed, and the design method for software and hardware of PROFIBUS-DP slave station is put forward, solving the problem of DP slave station based on SPC3 used for motion control.
EBD Control Research on Bisectional Roads for Electric Vehicles on Energy Regenerative and Feedback Friction Integrated Braking
Authors: Wang Guo Ye , Zhang Lu , Chen Guo Yan , Zhang Zhong Fu
Published: November 2012

Project the integrated braking system for electric vehicles based on in-wheel motor and friction brake. Set up the integrated system dynamic model based on energy regenerative and feedback friction integrated braking. Come up with EBD control strategy on bisectional roads based on ABS system. Establish the dynamics simulation system and EBD control simulation system for the electric vehicles with the integrated braking system based on Matlab/Simulink. Simulate and analyze EBD control performance of the integrated braking system on bisectional road straight condition aimed at Chery A3 sedan. The study results indicate that the EBD control performance of electric vehicle with the integrated braking system has a high braking energy recovery ratio, braking efficiency and braking stability.
Design of Emergency Power Supply Control System for Seismic Station
Authors: Gao Qin , Yao Zhen Jing , Peng Hong Wei
Published: November 2012

According to the special requirements of power supply for seismic station, a new single-phase emergency power supply control system is proposed in this paper. The principle and structure diagram of the system is illustrated. The control strategies of the system and hardware design of key circuits are discussed in detail. The emergency power supply control system adopts high-property C8051F310 single chip micro-computer. According to the monitoring value of input voltage, the system switches between charging and inverting. Main circuit of inverting uses single-phase full-bridge topology. To correct a power factor, charging system applies boost circuit to make input current follow to a given current reference. Experiments validate the feasibility of the proposed design.
Electric Pitch Control System Based on Fuzzy Control with Variable Region
Authors: Dong Hai Ying , Wei Zhan Hong , Zhao Xiang Gui , Li Xiao Qing
Published: November 2012

Electric pitch control system has time-varying, nonlinear, large inertia, wind speed uncertainty characteristics. A fuzzy control design method of electric pitch control system based on variable universe is proposed. In this method, the variable region algorithm is applied to the speed control of the electric pitch control system. The adaptive fuzzy controller with variable universe of the speed loop for the electric pitch control system is designed by adopting optimized proportional exponential contraction-expansion factor and using S-Function. The simulation experiment of electric pitch control system is carried on, which builds the fuzzy controller with variable region. Compared with traditional PID control, the results show that electric pitch control system based on variable universe fuzzy control has the strong anti-interference performance and robustness.
Study of Angle Control on Double Micro Emitter
Authors: Wu Yue , Yang Wei , Shi Chang Hong
Published: November 2012

At the base of development of ordnance, the study of model machine of controllable micro emitter definitive direction angle and pitch angle is advancing, which definitive direction angle and emissive angle is very important. By theoretical and empirical equation analysis, it may deduce dynamics equations about load flux of micro fluid controlling direction angle and emissive angle in micro emitter. After linearization, transfer function may be calculated. When deviation is very small, output and input control present good linear relation. So make emissive process control easy.