bluuebunny/crossref_metadata_2025 huggingface dataset:
Method of Health Performance Evaluation and Fault Prognostics for Electronic Equipment
Authors: Lou Fei Xin , Chen Xi Hong , Xu Yu Liang , Sun Ji Zhe , Wu Fa Wen
Published: November 2012

To deal with the health performance degradation of electronic equipment, a new health evaluation method based on improved manifold learning algorithm and HMM is proposed in this paper. Firstly, according to SNPP algorithm KSUNPP is proposed by introducing an uncorrelated constraint and kernel method, and the improved algorithm is used for feature extraction. Secondly, the health evaluation model of electronic equipment is constructed. Then, by calculating KL distance which can measure the fault degradation, the model can evaluate the health performance degradation. Finally, the proposed method is applied to health evaluation of electronic equipment which belongs to one type of missile, experiment results demonstrate that the method is effective.
Super-Heater Tube Wall Temperature Measurement Test and Analysis of 600MW Boiler
Authors: Wang Zhe , Pan Cheng , Xu Hai Chuan
Published: November 2012

In order to precisely monitor the inner-flue tube wall temperature of the boiler platen super-heater, the temperature measurement test of inner-flue and outer-flue tube wall has been carried out. And the data of inner-flue and outer-flue tube wall temperature was acquired in real time. According to the experimental data, the correlative rule about inner-outer flue tube wall temperature was analyzed and researched. Moreover, the data was analyzed to get the relationship of wall temperature, load, water-coal ratio, main stream temperature between the inner-flue and outer-flue furnace. So the correlative formula which was based on the relation between inner-flue tube wall temperature and outer-flue tube wall temperature was built up and checked.
Research and Manufacture on the Detection System on the Rifle Curve, Straightness and Roughness of the Firearm Bore Wall
Authors: Chen Pen Ren , Mao Kai , Sun Yu Mei
Published: November 2012

The rifle curve, straightness and roughness of the firearm bore wall play a crucial role to the shooting accuracy and distance. Detection on the bore wall is therefore very important on purpose of improving the accuracy of fine processing and ensuring the quality of products. However, the regular detection method is helpless due to the space and size restriction of the bore wall. In order to solve this technical problem, a detection system for the bore wall is discussed, the system structure is briefly introduced, the system principle is analyzed and the application value of popularization is also pointed out in this paper. The detection accuracy has exceeded the current standard at home and abroad and reached the level of nm. The rifle curve, straightness and roughness of the firearm bore wall play a crucial role to the shooting accuracy and distance. Detection on the bore wall is therefore very important on purpose of improving the accuracy of fine processing and ensuring the quality of product. As for the detection of rifle curve, straightness and roughness of the firearm bore wall, the current method is only limit to the endoscopic camera and computer image processing, and the effect on the larger flaw is obvious but can not reach the fine requirement for the detection of the new products.
Monitoring Ground Deformation Using Extracted DEM from Stereo-Pair Images of ALOS/PRISM
Authors: Lv Jing Guo , Yang De He , Yuan Feng , Yang Ming Hui
Published: November 2012

This paper used high resolution stereo-pair images from PRISM of Advanced Land Observing Satellite to generate high precision digital elevation model of target areas, which adopts the method of object space automatic matching and control detection. Compared with the same resolution of DEM from the other way in the same area, the paper educes the area of land subsidence and changed trend and analyzes the factors of accuracy for building DEM. The New DEM has higher precision than the standard DEM and reflects the real geomorphology. Through the experimental statistical analysis, the proposed method can be used for large areas of land subsidence and deformation monitoring, which is timeliness to explore reasons of region deformation.
Research on Rail Surface Defect Inspection System
Authors: Hu Yu , Mao Jian Xu , Mao Jian Pin
Published: November 2012

In order to realize the inspection of rail surface defects with high speed and high precision, an automatic detection system based on machine vision is presented. The hardware structure of the system consists of the mechanical system, control system and visual imaging system. The software structure using histogram threshold segmentation, multi-structural morphological edge detection and other image processing methods to detect and identify defects automatically, and also built the simulation rail detection platform. The experimental results show that the cracks, scars and other detects can be accurately detected and extracted in real time, and meet the requirement of the rail surface inspection.
Study of a New Real-Time Monitoring Method on the Underground Mining Activities
Authors: Meng Xiu Zhi , ZHANG Zengzhi , Wang Zong Sheng
Published: November 2012

This paper presents a new real-time monitoring method based on the explosion source location technique on the underground mining activities in the situation the state can not achieve the full uninterrupted supervision because of the backward monitoring tools and equipment. The supervise mode results in some small coal mines in the profit-driven to ultra-layer or cross-border mining which causes a many of safety accidents. The five acceleration vibration sensors buried underground in the mining area pick up blasting vibration waves coming from blasting tunneling. Every signal acquisition sub-station deals with the according sensor output signals by using wavelet transform to identify the P waves and using energy eigenvalue method to determine the arriving time of P wave to the sensor, then translates the sensor’s spatial and temporal parameters to the principal computer. The principal computer locates the explosion source by the Geiger algorithm and displays the explosion source’s spatial message in the mine’s electronic map. The method is feasible and the positioning horizontal error is less than 10m by field-proven.
Study on Detection Methods for Chlorine Precipitation during Biomass and Coal Co-Combustion
Authors: Wang Yong Zheng , Jiang Lei , Yue Mao Zhen , Bian Su Fang
Published: November 2012

In this paper, three detection methods were analyzed to determine the chlorine precipitation from the flue gas: Silver nitrate volumetric analysis (SNVA), Volhard method (VM) and Mercuric thiocyanate spectrophotometric method (MTSM). Results indicated that SNVA and VM were simple and convenient, but unsuitable for the detection of blend fuel due to the high lower limit. MTSM was suitable for biomass and coal co-combustion for its low lower limit and high sensitivity. In addition, MTSM needed less sample solution, which made it more suitable for multiple measurements to reduce errors, and the maximum proportional error was only 3.5%.
A Review of Acoustic Emission Technique for Machinery Condition Monitoring: Defects Detection & Diagnostic
Authors: Al-Obaidi Salah M. Ali , Leong M. Salman , Hamzah R.I. Raja , Abdelrhman Ahmed M.
Published: November 2012

Acoustic emission (AE) measurements are one of many non-destructive testing methods which had found applications in defects detection in machines. This paper reviews the state of the art in AE based condition monitoring with particular emphasis on rotating and reciprocating machinery applications. Advantages and limitations of the AE technique in comparison to other condition monitoring techniques in detecting common machinery faults are also discussed.
Research on FPGA-Based Three-Level Power Amplifier for Active Magnetic Bearings
Authors: Yu Wen Tao , Liu Shu Qin , Li Hong Wei
Published: November 2012

Three-level power amplifier with the characteristics of a small ripple, Aimed at existing situations of the three-level power amplifier without ASIC chips, a new three-level power amplifier circuit based on FPGA(Field Programmable Gate Array) is presented. Detailed analysis the principle of the three-level power amplifier, According to the principle, the FPGA internal composition and function of each module is designed, programmed using VHDL Language, functional simulated and validated by Modelsim which is specialized simulation software. The actual production of the three-level power amplifier is experimental testing for a step signal and sinusoidal signal. Test results show that the current response of AMB coil is fast and the current track is good. Finally, industrial successful applications in the Active magnetic bearing spindle.
Research on Carrier Phase Smoothing in GPS Relative Positioning
Authors: Ma Wen Zhong , Zhang Wei , Wang Zhi , Li Yao Rong
Published: November 2012

The principle of the GPS pseudorange relative positioning is analyzed. The carrier phase smoothing algorithm which combines the measured pseudorange and carrier phase components is studied. The accuracy of the pseudorange observables is improved by the algorithm, the ambiguity determination problem is skipped and the solution process is simplified while ensuring the positioning accuracy. A comparison between the result which takes before the smoothing algorithm and the one after the algorithm is made and the validity of the carrier phase smoothing algorithm is proved.
Design and Implementation of a Fractional Frequency Divider for Dual Mode Wireless Receivers
Authors: Fan Xiang Ning , Li Bin , Zhu Wei Wei , Yu Lu , Wang Yu Jie
Published: November 2012

In this paper, a fractional frequency divider (FFD) is designed for Phase-Locked-Loop (PLL) based Frequency Synthesizer, which can be used for GPS/Galileo and WCDMA dual-mode receivers. Based on a dual-modulus prescaler (DMP) and a programmable frequency divider (FD), the integer part can cover from 513 to 760. The fractional part is realized by improved MASH1-1-1 Delta-Sigma (Δ-Σ) modulator (DSM). The whole fractional frequency divider is implemented in TSMC 0.18μm CMOS process, occupying a chip area of 0.714mm2. With the voltage supply of 1.8V, the operating frequency range of the fractional frequency divider is 0.5-5.3GHz; and its supply current is about 5.9mA.
Gm-C Complex Band-Pass Filter with Tuning Circuit in 0.18μm CMOS
Authors: Fan Xiang Ning , Bao Kuan , Wu Rui , Liu Jun Bo
Published: November 2012

This paper presents a 0.18μm CMOS based Gm-C complex band-pass (CBP) filter with tuning circuit. Active-Gm-C structure with Nauta transconductor and phase-locked loop (PLL) architecture are adopted by the filter and the tuning circuit respectively which can achieve accurate frequency response. The layout size is 970μm×920μm. Under a 1.8V supply voltage, measurement results show that the pass-band gain and the ripple of the filter is 3.1dB and 3dB respectively. The bandwidth after tuning is 32.5MHz, image rejection ratio (IRR) is about 47dB, and the power dissipation of the filter is about 21.6mW.
Analyzing p-MOSFET Lifetime by Employing R-D Model & MOS Device Theory
Authors: Manzoor Sadia , Karim Nissar Mohammad , Soin Norhayati
Published: November 2012

For CMOS circuitry the models which are able to determine the reliability of the components and the methods which lead them to the degradation of the reliability issues are very important. Negative bias temperature instability (NBTI) is a critical issue for the p-MOSFETs. It causes, shifting of drive current and threshold voltage of P-MOSFET. Till date many models capable of simulating various features of the NBTI degradation have been proposed by researchers. Reaction Diffusion (R-D) model is notable among them. This paper demonstrates a new approach which analyzes the combination of R-D model and transistor theories. To do so, we analytically correlated R-D model and device theory. The analysis shows the lifetime estimation for p-MOSFET device with respect to drain current.
Design and Analysis of Low Power CNTFET TSPC D - Flip Flop Based Shift Registers
Authors: Ravi T. , Kannan V.
Published: November 2012

This paper enumerates the efficient design and analysis of low power CNTFET True single phase clock logic D Flip flop based shift registers. The TSPC D flip flop and shift registers are designed using Stanford University CNTFET model and proposed 10nm CNTFET model with sleepy keeper low power technique. The CNTFET is emerging as a viable replacement to the MOSFET. The transient and power analyses are obtained with operating voltage of 1V and the operating frequency at 1GHz. The simulation results are obtained and the analysis are compared with circuits designed using 32nm MOSFET. The comparison results are indicated that the proposed 10nm CNTFET based design and the low power technique are more efficient in power saving as compared to MOSFET design.
Reverse Design and Application of Irregular Planar Part Based on Image Processing
Authors: Yin Jian Jun , Lin Jia Qing , Gauri S.Mittal , Li Shuang
Published: November 2012

By using a computer vision detection system to obtain high resolution images of a machine part, a kind of reverse design method of solid modeling of irregular planar part with aided implementation of computer vision was proposed in this paper, which integrates image processing function of Matlab software with solid modeling function of computer aided design (CAD) software. The method used a calibrated digital camera to get the image of the tested part, a three-dimensional entity vector model may be built up after image inversion, edge detection, vectorization process of binary image and size matching were operated sequentially. The results of image reverse design showed that it is an easy and convenient way to reverse irregular planar parts based on image processing. One of its remarkable advantages is the saving of design period and the reduction of design cost. Its measurement error can be controlled within 0.1 mm, and can meet general precision requirement of application occasions. Reversed parts may provide a model basis for further analysis on mechanism assembling and motion simulation.
BM3D Denoising Algorithm with Adaptive Block-Match Thresholds
Authors: Zhang You Sai , Zhu Shu Jin , Li Yuan Jiang
Published: November 2012

A number of image filtering algorithms based on nonlocal means have been proposed in recent years which take advantage of the high degree of redundancy of any natural image. The block-matching with 3D transform domain collaborative filtering (BM3D) proposed in [1] achieves excellent performance in image denoising. But the choice of shrinkage operator in block-matching step is not discussed, only given the threshold by experience in its related papers. In this work, we introduce an improved version of BM3D with adaptive block-match thresholds. The proposed method firstly seeks the relationship between the Structural Similarity index (SSIM) [2] and match distance in blocks and obtains the data with fine SSIM values. Then, compute the Noise level and Gradient values in blocks of the same block size. Finally, surface fitting is adopted to get a formula which applies weak thresholds for flat blocks and strong thresholds for detail blocks. Experiment results are given to demonstrate the same class of denoising performance with less time-consuming to slightly noisy image and good improvement in denoising performance to seriously noisy image.
Rapid Visualization of Global Ship Tracks Data Based on 3D GIS
Authors: Song Qiang Wei , Qiao Qing Hua , Li Qing Yuan
Published: November 2012

On the basis of the analysis of spatial distribution characteristics of massive ship tracks data, the model of spatiotemporal cube was established and the “3DR-Tree” algorithm was proposed to study the efficient index building technology. The spatiotemporal query of massive ship tracks data was realized and the ship historical trajectories were also displayed in the global environment intuitively and dynamically, it can be used for maritime search and rescue effectively.
Homogenization and Melt-Emulsification Techniques for Ibuprofen Particle Size Reduction: Effect of Tween 80 & Sonication
Authors: Tuntarawongsa Sarun , Phaechamud Thawatchai
Published: November 2012

Ibuprofen suspensions were prepared by simple homogenization with melt-emulsification process. Tween 80 was used as stabilizer. The homogenized suspensions were evaluated and compared with melt emulsificated suspension. The pH value and rheology behavior were not difference. The viscosity was very low. Zeta potential was -10 to -25 mV. In this study, the suitable process to minimize particle size of ibuprofen suspension was melt emulsification follow by sonication. This process could be developed to obtain nanosuspension by adjust sonication process and improved formulation to obtain suitable nanosuspension.
The Development and Research on the Engineering Graphics Based on Computer Technique Era
Authors: Li Ze Rong , Li Bi Ru , Qin Li , Gong Jian Chun
Published: November 2012

This article analyses the development history of Engineering graphics, researches on modern engineering graphics, and puts forward the problem of modern engineering graphics, as drawing and interpreting drawings all need special training. For the problem this article puts forward the new structure of pattern: using three-dimensional pattern to replace traditional two- dimensional pattern, expressing the inside and outside structure shape of parts, by the profile and rotation of three-dimensional pattern. the three-dimensional is more directer and visualer than the two-dimensional patterns as the same method to express the structure and shape of objects. use three-dimensional to express to avoid the two conversions from three-dimensional to two-dimensional(drawing) or from two-dimensional to three- dimensional(interpret drawings).
Cone-Beam CT Fast Reconstruction Method Based on the Minimum Three Dimensional Convex Hull for Actual Scan Data
Authors: Huang Kui Dong , Zhang Ding Hua , Li Ming Jun , Zhang Hua
Published: November 2012

In the three dimensional reconstruction of cone-beam CT, a fast reconstruction method based on the smallest three dimensional convex hull was proposed for actual scan data. First, according to the definition of the minimum three dimensional convex hull, the minimum three dimensional convex hull of the detected object was obtained in the actual scan using a segmentation algorithm based on the projected images, and then with the Z-line data first algorithm, the image reconstruction area was limited to the minimum three dimensional convex hull to enhance the cone-beam CT reconstruction speed by reducing the redundant computing. The experimental results show that this method can effectively reduce the memory consumption, and significantly improve the reconstruction speed and reduce the noise surrounding the object imaging area.
Tower Modal Parameters Identification Based on Polymax Method
Authors: Yu Wen Wen , Tian Hao , Zheng Hai Qi , Chen Dong Gen
Published: November 2012

Based on the background of a high tower structure under environment random excitation, large-scale complex system parameter identification based on Polymax method is presented in this paper. Firstly,the system of testing environment excitation response signal for large tower is designed.Secondly,the obtained signal is analysed and intercepted,then the ideal signals are selectted from each experiment. Lastly, the intercepted signal is identified for some parameters based on polymax method.The obtained result shows that the former is effective.
Agricultural Transport Vehicle Maintenance Cycle Optimization Analysis and Modeling
Authors: Qiao Xiang Ming , Zhang Heng Hai , Li Zheng Luan
Published: November 2012

To solve the optimization problem of agricultural transport vehicles’ maintenance cycle, in the premise of periodic testing and diagnosing technical condition of vehicles, based on the Weibull distribution, and use renewal function H (t), the related mathematical model is established, which optimization objective is to make the costs required for vehicle detection, diagnosis and maintenance unit run time (or mileage) the lowest. By analyzing a large number of collected samples, we confirm the running fault of a certain type agricultural transport vehicles belonging to Weibull distribution, and find the optimal solution of built model. Vehicle running tests show that the results are accurate and reliable, can guide the vehicle transport operations.
Research on Distribution Algorithm of Parking Lot Spaces
Authors: Zhang Jie , Dou Ya Xing , Fan Xiao Yan
Published: November 2012

Large-scale parking lot contains numerous spaces, thus, it’s so important and necessary to distribute the parking spaces more appropriately to offer all users right places to park their cars in short time. This paper has given the research method on how to distribute the parking spaces which conduct a well balance point between uniform distribution and driving path. Distribution algorithm has been proposed when the user who does not reserve and user who reserves temporarily, which has been verified to be reasonable.
Integration Design of Space Structure Based on CIS
Authors: Liu Ping , Gong Yi Fu , Jin Hai Gong , Yi Ping Ding
Published: November 2012

As the development of engineering software, data exchanging becomes more and more important. Integration of design has become a trend in building industry. An urgent problem in designing is to solve the data exchanging between different software. In response to this demand, the mapping rules and its expression style of CIS which is an international standards of integrated design of steel structure are introduced. Besides, the application and future prospects of CIS in space structure are also expounded. In the end, some example of application using CIS standard in space structure are showed. which are very usefully to project.
Study on Real-Time Simulation on Hardware-in-the-Loop Platform for Single-Side Wheel Steering by Wire with dSPACE and Simulink
Authors: Li Qiang , Sun Zu Ming , Ren He
Published: November 2012

Aiming at ordinary development DC motor existence shortcomings as complex algorithm and difficult real-time adjustment, the Hardware-In-the-Loop(HIL) platform is put up for single-side wheel steering system. The structure of software and hardware and important component is described in detail, and the real-time simulation model is developed using Simulink and dSPACE. With interest of better effects on real time control steering motor is achieved with ControlDesk by means of on-line tuning, monitoring, debugging and optimization of PID control parameters. The experimental results demonstrate that dSPACE system applied in DC motor has the advantages of good real-time control effect and effectively shorten controller development cycle and cost for the sake of establishing foundation on the proceeding research.
The Reseach on the Environment Factors of the Infrared Radiation for the Targets on the Ground
Authors: Mu Cheng Po , Chen Yuan Qian , Yuan Zhi Jie , Song Jia
Published: November 2012

Infrared scene simulation is an important issue in the military field. Infrared scene simulation system can reproduce and simulate the infrared radiation characteristics of target and its background. Therefore, the analysis of the infrared radiation of target and scene features is very important for Infrared scene simulation. In this paper, we focus on the calculation and analysis of typical environmental factors of ground targets, including solar radiation, sky atmosphere radiation and ground radiation etc.. We also discuss how to calculate the infrared radiation of target in this paper. The results of this paper will be used for analysis of the infrared radiation and the simulation of the infrared scene of ground targets.
Simulation and Analysis for New Contact System of Control and Protective Switching Based on Ansoft Maxwell
Authors: Cai Zhi Yuan , Guo Zhan Nan
Published: November 2012

CPS (control and protective switching) one of the smart integrated include the function of circuit breakers, contactors, and low-voltage electrical appliances. The contact system is different from the traditional low-voltage electrical function. Well-designed structure of the contact system has important practical significance for overall performance of CPS. The paper proposes a new contact system. The simulation analyze the electrical repulsion of the traditional contact system and a new contact system under different current size, breaking time, blowing arc magnetic field analysis by electromagnetic simulation software. According to the results of the simulation comparison, prove that the new contactor structure making the function of CPS increased.
Study and Analysis Texture Mapping Technology Based on OpenGL
Authors: Xu Jin , Chen Xun
Published: November 2012

The program development process based on the OpenGL in order to make the resulting image with a high degree of realism, we often use technology to manipulate the image texture, because Using texture mapping can easy build abundant and vivid scenes in OpenGL programs, Texture mapping through the pixel and geometry object union, to create a geometry object is very complex, real visual effect, also avoided a lot of geometric model established for overhead.
On-Ramp Fuzzy Metering and Simulation in Urban Expressway
Authors: Chen Xue Wen
Published: November 2012

In view of the high complexity and uncertain characteristics of traffic flow in urban expressway, a fuzzy logic approach is proposed to adjust the number of vehicles entering a mainline of urban expressway via entrance ramp during rush traffic times. Taking account of the combine influence of traffic state on mainline and the on-ramp queue at Surface Street, the on-ramp fuzzy controller of urban expressway is designed based on such traffic information as the speed downstream mainline, time occupancy upstream mainline, and on-ramp queue length at the Surface Street. Simulation research based on MATLAB toolbox is carried out and the results show that the fuzzy controller is feasible and reasonable to confirm the number of vehicles entering the mainline of urban expressway.
An Improved Directed Acyclic Graph Support Vector Machines Based on Inter-Cluster Separability Measure in Feature Space
Authors: Ai Qing , Zhao Ji , Qin Yu Ping
Published: November 2012

For disadvantage of the methods that are used to evaluate inter-cluster separability measure, a novel separability measure is proposed and applied to directed acyclic graph support vector machine. The distance between cluster centers and distribution of samples in feature space are both considered by the algorithm. Firstly, use hyper-sphere support vector machine to obtain minimal bounding hyper-sphere of each cluster, according to the radius and centers of minimal bounding hyper-spheres, introduce the concept of inter-cluster separability measure in feature space, get the matrix of inter-cluster separability measure according to the concept, finally construct the directed acyclic graph according to the matrix. The experimental results show that the algorithm has higher classification precision, comparing with old directed acyclic graph support vector machine.
Effect of Varying Dielectric Constant on Relative Stability for Graphene Nanoribbon Interconnects
Authors: Farrokhi Maryam , Faez Rahim , Nasiri Saeed Haji , Davoodi Bita
Published: November 2012

The remarkable properties of graphene nanoribbons (GNRs) make them attractive for nano-scale devices applications, especially for transistor and interconnect. Furthermore, for reduction interconnects signal delay, low dielectric constant materials are being introduced to replace conventional dielectrics in next generation IC technologies. With these regards, studding the effect of varying dielectric constant (ɛr) on relative stability of graphene nanoribbons interconnect is an important viewpoint in performance evaluation of system. In this paper, Nyquist stability analysis based on transmission line modeling (TLM) for graphene nanoribbon interconnects is investigated. In this analysis, the dependence of the degree of relative stability for multilayer GNR (MLGNR) interconnects on the dielectric constant has been acquired. It is shown that, increasing the dielectric constant of each ribbon, MLGNR interconnects become more stable.
Path Planning for Ground Simulation Objiect Based on A* Algorithm
Authors: Zhao Zhi Qiang , Liu Zhi Hua , Hao Jia Xin
Published: November 2012

In the process of ground simulation object maneuver simulation in large-scale operation simulation, an efficient path planning method based on A*algorithm is proposed. By means of introducing all kind of geography factors and security factors into heuristic function, the plan reaching method solves the problem of finding an optimal path under acquiring enemy's situation and terrain data. Experiment results show that it has effectively raised path planning speed of A* algorithm and the scheme is practical and feasible.
The Virtual Manufacture of a Kind of Corn Stubble-Smashing Machine and Shallow Analysis
Authors: Niu Ming , Liu Jiu Qing , Meng Ge , Shang You Yun
Published: November 2012

The scheme of structure and transmission is designed in the paper. A kind of stubble-smashing machine is virtually manufactured by the software Pro/E 4.0. On the base of it, the deformation analysis and strain analysis of smashing cutter are done with the software ANSYS Workbench13, which shows that the machine can meet the work requirements. The paper supplies theoretical basis for the design of corn stubble-smashing machine.
Numerical Investigation of Turning Diffuser Performance by Varying Geometric and Operating Parameters
Authors: Nordin Normayati , Raghavan Vijay R. , Othman Safiah , Abdul Karim Zainal Ambri
Published: November 2012

This paper presents a numerical investigation of pressure recovery and flow uniformity in turning diffusers with 90o angle of turn by varying geometric and operating parameters. The geometric and operating parameters considered in this study are area ratio (AR= 1.6, 2.0 and 3.0) and inflow Reynolds number (Rein=23, 2.653E+04, 7.959E+04, 1.592E+05 and 2.123E+05). Three turbulence models, i.e. the standard k-e turbulence model (std k-e), the shear stress transport model (SST-k-W) and the Reynolds stress model (RSM) were assessed in terms of their applicability to simulate the actual cases. The standard k-e turbulence model appeared as the best validated model, with the percentage of deviation to the experimental being the least recorded. Results show that the outlet pressure recovery of a turning diffuser at specified Rein improves approximately 32% by varying the AR from 1.6 to 3.0. Whereas, by varying the Rein from 2.653E+04 to 2.123E+05, the outlet pressure recovery at specified AR turning diffuser improves of approximately 24%. The flow uniformity is considerably distorted with the increase of AR and Rein. Therefore, there should be a compromise between achieving the maximum pressure recovery and the maximum possible flow uniformity. The present work proposes the turning diffuser with AR=1.6 operated at Rein=2.653E+04 as the optimum set of parameters, producing pressure recovery of Cp=0.320 and flow uniformity of su=1.62, with minimal flow separation occurring in the system.
Numerical Simulation of Combustion for Freely Falling Gelled Fuel Droplets under Normal Gravity Conditions
Authors: Liu Ze Jun , He Zhen , Hu Xiao Ping , Wu Jian Jun
Published: November 2012

Understanding the evaporation and combustion mechanisms of single droplets of gel propellant is the first stage to predict the burning characteristics in the combustion chamber. This paper, taking into account convection heat for freely falling gelled fuel droplets under normal gravity conditions, as well unsteady mass diffusion and thermal diffusion inside droplet, a theoretical model was developed to understand mass and heat transport mechanisms, and bubble growth within the gel droplet during processes of droplet combustion. The results show that at the first stage, shrinkage of the radius obeys the d2-law; steep temperature gradient and fuel mass concentration gradient appear within droplet, especially region near droplet surface. At the second stage, liquid fuel near the gellant layer within droplet starts to boiling, gellant layer formation resist the vaporizing fuel gas flow to extent; the vapor region appears between gellant layer and vaporizing surface within the droplet, and the droplet expands, swells, the layer thickness decreases until it ruptures.
Design of Intelligent Control Billboards Based on MCU
Authors: Chen Jin , Wan Yuan Peng , Li Yao Ming , Liu Li Chen , Li Jing , Wang Duan , Zhu Tong
Published: November 2012

With the inconvenience of the existed billboards on the market, this paper built a new kind of system made by hand-held transmitter to send remote control signals to change the ad content displayed on the billboard. Remote control device with STC89C52 microcontroller core, and display systems use the C8051F020 microcontroller to drive the integrated LCD module. The communication between the two using RS232 communication protocol to build smart billboard system. Through simulation, the design can easily achieve the function of changing the display content by intelligent remote.
Plate Width Control Based on Neural Network in Hot Mill
Authors: Ning Shu Rong , Sun Tong
Published: November 2012

Based upon the model analysis on hot roll width control system, an online adaptive PD combined with Neural Network control method is proposed to account for the complicated process dynamics characterized by nonlinear, parameter uncertain and load disturbances etc. The NN model was introduced as a feed-forward controller to study the controlled plant inverse dynamic. The controller is independent of the exact controlled system modeling, and the control parameter can be regulated online by using the measured input/output datum based on feedback error learning method. The PD controller act as feedback one to ensure the robustness. The proposed scheme is simulated on vertical roller of hot strip mill. The control performance is analyzed in detail in terms of the system response speed and accuracy, as well as robustness to rolling temperature variation.
Research on Cooperation Localization and Mapping for Hoisting Multi-Robot System
Authors: Jun Lin , Bin Zi , Xia Wu
Published: November 2012

According to the practical operation of the hoisting multi-mobile robots system (HMRS), the cooperation localization and mapping is studied. Firstly, an improved algorithm of cooperation localization solution of multiple robot system is proposed based on map gridding algorithm. In addition, by virtue of sensor technology, the grid method is designed, which has the ability of accurate, reliable localization and rapid local mapping of the HMRS. Finally, simulation results demonstrate that the localization and mapping system is feasible and efficient.
Effect of Milling Time on the Structural Properties of Titanium Dioxide Nanopowder
Authors: Hafizah N.N. , Achoi M.F. , Ismail L.N. , Rusop M.
Published: November 2012

This paper report the effect of milling time on the structural properties of TiO2 nanopowder prepared from sol-gel milling process. The synthesized TiO2 nanopowders have been characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and Fourier transform infrared (FTIR). XRD result reveals that the TiO2 nanopowder in anatase phase is detected. The morphology of the TiO2 nanopowder change obviously with the increase of the milling time. Further, FTIR results found the sharp peaks of Ti-O-Ti and Ti-O bonding at below 600 cm-1 for all TiO2 nanopowder.
Study on Velocity Smooth Method for Five-Axis CNC
Authors: Wang Heng , Wen Wei Gang , Cheng Wei Dong
Published: November 2012

A velocity blending method is devised for micro-segment line high-speed machining. The model is constructed for blending velocity, and the blending curve equation is established under the constraint of maximized contour error. According to MATLAB simulation, the proposed model and its solving algorithm can achieve the high-speed linking between micro-segment lines, and the efficiency is promoted distinctly.
Globally Exponential Synchronization for the Genesio-Tesi Chaotic System via Feedback Control with Two States
Authors: Guo Jiang Hong , Jian Ji Gui
Published: November 2012

Based on matrix theory and inequality techniques, feedback control with two states is proposed to realize the globally exponential synchronization of two Genesi-Tesi chaotic systems. Some new sufficient algebraic criteria for the globally exponential synchronization of two chaotic systems are obtained analytically. The controllers here designed have simple structure. Numerical simulations are presented to show the effectiveness of the proposed chaos synchronization scheme.
The Rotor Speed Control of 5MW Wind Turbine under Rated Wind Speed Using Adaptive-PID Controller
Authors: Tan Zong Qi , Li Can Can , Ye Hui Jun , Zhou Yu Qiong , Zhu Hua Ling
Published: November 2012

This paper designed the controller of the wind turbine rotor rotating speed. This model of adaptive-PID through control the tip-speed ratio and count the values of PID for variable wind speed. From the result of simulation, the wind speed can run in a good dynamic characteristic, and keep the rotor running in the best tip-speed ratio at the same time.
Application of Variable Blade Pitch Control on Improving the Performance of Vertical Axis Wind Turbine
Authors: Cheng J.C. , Su S.J , Miau J.J
Published: November 2012

A three blades vertical axis wind turbine simulation is performed to study the unsteady aerodynamic characteristics with blade pitch control. Several fixed and variable blade pitch models under different tip speed ratio are adopted to improve performance of the wind turbine. Results show that an appropriate pitch control model can effectively decrease the range of negative torque regime to reduce the vibration of the wind turbine. Besides, the average torque coefficient as well as the energy capture efficiency can be also improved, especially for the lower tip speed ratio. The overall efficiency of the wind turbines in power generation will be enhanced. For the cases under the tip speed ratio between 1 and 3, the efficiency can be enhanced 243% and 486% for fixed and variable pitch control models respectively as comparing with non-pitch control cases.
Modeling and Fuzzy Control of a Crude Oil Preheating Furnace
Authors: Chaibakhsh A. , Pourbeheshtian M. , Sigaroudi M.J. Javadi , Najafi H.R.
Published: November 2012

This paper presents the development of mathematical model and designing a temperature control system for an industrial preheating furnace. In the first part of the paper, the simulation model was developed based on thermodynamics principles, energy-mass balance and semi-empirical relations. The parameters of developed models were defined with respect to available operational and geometrical data from real system. In the second part, an appropriate control system was designed for regulating the preheating furnace temperature. A fuzzy logic controller and a feedback/feedforward controller were employed for operating in coordination with each other to maintain the process outlet temperature around 360 oC. Simulation results show the capability of the designed control system to regulate the furnace outlet temperature at different operating conditions and in the presence of disturbances.
Theoretical Analysis of Friction Compensation Using Sliding Mode Control
Authors: Rafan N.A. , Jamaludin Z. , Tjahjowidodo T. , Chey L.S. , Chiew T.H.
Published: November 2012

Friction is an undesired nonlinear phenomenon that reduces position and tracking accuracy in machine tools application. This paper focuses on development of control technique to compensate friction force at motion reversal of a drive system that generates quadrant glitch phenomenon thus improving tracking accuracy. Sliding Mode Control (SMC) is designed to compensate friction. The Generalized Maxwell-Slip (GMS) friction model is applied for numerical analysis. The performance of the controller is analysed based on the reduction in the quadrant glitches magnitude. The performance of the SMC controller is compared with the classical PID controller. Results show that SMC controller yields the smallest quadrant glitch magnitudes.
Influence of Drawing Temperature and Die Clearance on Wall Thickness of AZ31B Deep Drawn Part
Authors: Lin Shu Xia , Zhang Cheng Lin , Gao Jun , Ruan Li Qun
Published: November 2012

In this paper, AZ31B drawing test was carried out under the mechanical press with crank-slide mechanism. The influence of drawing temperature and drawing clearance on the wall thickness of AZ31B drawn parts was studied through testing. Some conclusions were drawn, which are: with the increase of drawing temperature, minimum wall thickness ( Tmin ) and maximum wall thickness ( Tmax ) of AZ31B drawn parts substantially decreased; with the increase of drawing clearance, Tmin and Tmax of AZ31B drawn parts increased.
Experimental Investigation on Micro Electrochemical Milling of Nickel-Based Superalloy
Authors: Liu Yong , bin Zeng Yong
Published: November 2012

In this paper, sets of experiments are carried out on the difficult-to-machine nickel-based superalloy based on the principle of micro electrochemical milling with nanosecond pulse current. First, an experimental system for meeting the requirements of the EMM process is established. Second, sets of experiments are carried out to investigate the influence of some of the predominant electrochemical process parameters, such as machining voltage, pulse on time, and electrolyte concentration, on machining accuracy. Finally, using the optimization parameters, a series of 2D and 3D micro structures have been successfully obtained.
Research of the Operating Parameters from Reducing Industrial Water Conductivity through Electro Sorption Technology
Authors: Liu Yang , Zhou Jun Bo
Published: November 2012

In order to reduce the conductivity of power-station’s circulating cooling water and reduce sewage discharge, this essay does research on using electro sorption technology to replace traditional water treatment technology. Through exploring the voltage and flow of the working module from experiment, it determined the optimum working conditions for electro sorption. The experiment includes the efficiency of reducing inlet water conductivity at different voltages, and the effect of flow rate to the treatment, proving that water conductivity will drop from 3,000 to 700 μS/cm on the condition of 1.7 V voltage and 500 L/h flow rate, which makes great sense to Electro sorption industrial applications.
Design and Experimental Research on Isolation Mechanism for Opto-Electronic Platform in Moving Carries
Authors: He Zhong Bo , Zhao Jin Hui , Li Yu Long , Bai Hong Bai , Tao Shuai
Published: November 2012

Vibration can influence the imaging quality and tracking precision of the moving opto-electronic platform seriously, some measures of reducing vibration must be taken into consideration. In this paper the influence which vibration works on the imaging quality is analyzed, a novel design scheme of the damping mechanism is proposed, two new type Metal Rubber Isolators are designed, and two dimensional dynamic angle measuring instrument using linear CCD is applied to measure the dynamic rotational displacement of the opto-electronic platform. The result of vibration sweeping experiment shows that the isolator mechanism can reduce the three axis’ vibration higher than 25Hz. The angle-measurement result presents that the maximum rotational displacement is , which is suited to the demands of the imaging experiment.
Carrier Transport Enhancement in Bulk-Heterojunction Organic Photovoltaics with Boron or Nitrogen-Doped Carbon Nanotubes
Authors: Park Hyung Il , Lee Ju Min , Park Ji Sun , Lee Kyung Eun , Kim Sang Ouk
Published: November 2012

We present the remarkable performance improvement of organic solar cells upon incorporating N- or B-doped carbon nanotubes (CNTs) into the organic semiconductor active layer. A small amount (0.2-5.0 wt%) of doped multi-walled CNTs are added to the bulk-heterojuction of poly(3-hexylthiophene) (P3HT) and 1-(3-methoxycarbonyl) propyl-1-phenyl[6,6]C61 (PCBM). Unlike undoped metallic multi-walled CNTs, which cause undesired electron-hole recombination, N- or B-doped CNTs uniformly dispersed in the active layer selectively enhance electron or hole transport, respectively, and eventually help carrier collection. Specifically, the incorporation of 1.0 wt% B-doped CNTs results in a balanced electron and hole transport and accomplishes a power conversion efficiency improvement from 3.0 % (conventional control cells without CNTs) to 4.1 %.
Comparison of Treatment Method of Plane Nodes in Truss Structure of Transmission Tower
Authors: Li Lin , Song Meng Jiao , Du Guo Liang
Published: November 2012

With the advance of construction of the ultra-high voltage grid, more and more attention is paid to transmission tower design while taking into account the economic and security. In the transmission tower structure, there are usually plane nodes, accompanied with a diaphragm or a cross arm. The treatment method of plane nodes has direct effect on the accuracy of result in solving the stiffness matrix for analyzing the tower structure. Several treatment methods of plane nodes are compared by ANSYS and MATLAB programming respectively. Empirical results show that the computational results are more close to the actual situation with "Plus virtual bar method". Thus, it demonstrated that above-mentioned method is more suitable for the independent developed tower calculation, which can provide a good reference for future tower calculation.
A Study on Cumulative Effect of Production Blasting Vibration on Slope Failure in Xiaolongtan Coal Mine
Authors: Yang Yi , Wang Guo Hua , Liu Di , Wang Shi Wen
Published: November 2012

With the gradual escalation of mining depth, the problems of deformation and destabilization of high and steep slopes became increasingly severe. The long-term repetitive blasting vibration had long-term cumulative damage effect on the slope stability of Xiaolongtan Open-pit Coal Mine, because it adopted blasting as the principal instrument to exploit rocks. Based on the long-term blasting vibration tests in Xiaolongtan Open-pit Coal Mine, this paper analyses the deformation rules of the creeping slope there under the action of long-term blasting seismic fluctuating load. It analyzes and demonstrates the existence of the cumulative effect of blasting vibration. In addition, it puts forwards that the deep will form sliding surfaces, the superficial place will form different sliding bodies and different regions of the slope will appear deformation under the cumulative effect of the long-term blasting vibration, namely, the damage effect and accelerative effect. The acceleration of the transition process from slowdown creeping flow to stable creeping flow will eventually lead to the formation of accelerative creeping flow, thus resulting in the damage of the slope.
A Multi-Agent Model for Supply Chain Based on Coordination Center
Authors: Lin Li , He Lian Fei
Published: November 2012

This paper analyzed the composition of the multiple agent system, and combine with the characteristics of simulation in multiple agent. This paper proposed a supply chain system structure based on the coordination center, to achieve communications between any two entities through the coordination center. This paper constructed the agent module chart of coordination center, suppliers, producers and distributors, and expounds the function and task flow of the coordination center, and design the mechanism for data transfer between modules, in order to realize the data exchange between different entities. In this model, the coordination center takes effective measures like effectively plan, coordination, dispatch and control for the logistics, cash flow and information flow of supply chain. So it has a good reference value for the practical application of supply chain model.