bluuebunny/crossref_metadata_2025 huggingface dataset:
Modeling and Optimizing of Control System with Full-State Feedback and Integral Output Feedback for DC Motor
Authors: He Qiang
Published: October 2011

Conventional single closed-loop system of DC motor with speed-feedback has poor performance when some stochastic disturbances take place. To handle this shortcoming, the control system with full-state feedback and integral output feedback of DC motor is proposed. The state-space model of the full-state feedback of DC motors is established. The feedback gains of the control system are optimized by Particle Swarm Optimization algorithms based the simulation model. The simulation results show that the control system with full-state feedback of DC motors has better dynamic performance.
Dimension-Descending Algorithm for Spherical Delaunay Triangulation
Authors: Duan Ping , Li Jia Tian , Li Jia
Published: October 2011

Spherical Delaunay triangulation (SDT) which is a powerful tool to represent, organize and analyze spherical space data has become a focus of spherical GIS research. Projection stitching algorithm is one of the main construction algorithms of SDT. The basic idea of stitching algorithm is that the sphere is divided into two hemispheres to avoid projected image point coincidence. So, the practicality of projection stitching algorithm is lower because of merging two hemispheres. Aimed at the disadvantage of projection stitching algorithm, this paper puts forward a new algorithm to construct SDT used perspective projection principle. The projection center is placed on sphere to establish one-to-one mapping between spherical space points and plane image points. Experiment shows that the time complexity of our algorithm depends on Delaunay triangulation construction algorithm of the plane.
Image Digital Watermarking Algorithm Based on Arnold Scrambling and Wavelet Transform
Authors: Liu Xian Feng , Li Shu Ming
Published: October 2011

A new image digital watermarking algorithm based on DWT is proposed, by which Arnold scrambling is firstly processed followed by wavelet decomposition in images. Then the watermark information is embedded in the processed digital images according to certain rules. The experimental results show that the algorithm has a better robustness against common attacks of JPEG and median filtering.
Capacity Stability Analysis for 4-Element Compact MIMO Systems
Authors: Li Yue Heng , Cheng Cheng , Ju Mei Yan , Tan Guo Ping
Published: October 2011

In this paper, both 3-dimentional channel matrix eigenvalue probability distribution and a newly proposed generalized condition number (GCN) are used to analyze the capacity stability of 4-element compact MIMO systems when the mean angle of arrival (AoA) of the incident waves varies in the case that mutual coupling among array elements is considered. Theoretical analysis and numerical simulations show that comparing with the traditional 4-element linear array, 4-element square array with spatially symmetric structure is much less sensitive to the angle of incidence, indicating that the square array can maintain a more stable capacity.
Comparation between GA and PSO Controller Optimization for PMSM Driving
Authors: Zhang Ping , Song Zheng Qiang
Published: October 2011

This paper presents a comparative study of two popular Evolutionary Algorithms (EA): GeneticAlgorithms (GA) andParticle Swarm Optimization (PSO) for optimal tuning of Proportional Integral (PI) speed controller in Permanent Magnet Synchronous Motor (PMSM) drives.Comparisons between the results obtained by GA method and those by improved PSO method are made. The experimental results show that the PSO method can locate the optimal or near optimal parameter space and achieve a higher quality solution than the GA method.
Loop Extended Symbolic Execution on List Manipulating Programs
Authors: Li Ren Jian , Wang Zhao Fei , Dong Long Ming
Published: October 2011

Current symbolic execution is challenged by its ability to deal with loops. The case gets worse for loops manipulating recursive data structures. In this paper, we extend classic symbolic execution techniques for error detection of programs manipulating lists in loops. The idea is to enhance the symbolic execution with the utilization of quantitative aspect of the shape, and to construct the exit state of the loop. The exit state is constrained by a set of numeric constraints containing normal symbolic variables in programs and instrumented symbolic variables on the shapes. A prototype tool has been implemented and experiments are conducted on some commonly used list manipulating programs.
Research of Automobile Quality Fault Diagnosis Method Based on CBR
Authors: Zhang Fan , Zhou Zu De , Liu Xiao Jie
Published: October 2011

CBR (Case-based reasoning) theory is applied to the automobile quality fault diagnosis field. Case description, case retrieve and case reuse are the main factors of CBR. It is realized by the methods of fault tree construction, discrete cases information entropy weight value calculation, discrete and multi-level semantic matching case retrieval and knowledge difference driving case reuse. The process of solving actual cases verify the validity and efficiency of CBR method in the quality fault diagnosis system.
The HGEDA Hybrid Algorithm for OLAP Data Cubes
Authors: Jia Chen , Chen Hong Wei
Published: October 2011

On-Line Analytical Processing (OLAP) tools are frequently used in business, science and health to extract useful knowledge from massive databases. An important and hard optimization problem in OLAP data warehouses is the view selection problem, consisting of selecting a set of aggregate views of the data for speeding up future query processing. In this paper we present a new approach, named HGEDA, which is a new hybrid algorithm based on genetic and estimation of distribution algorithms. The original objective is to get benefits from both approaches. Experimental results show that the HGEDA are competitive with the genetic algorithm on a variety of problem instances, often ﬁnding approximate optimal solutions in a reasonable amount of time.
Charge Strategy Study for Supercapacitors Applied to Regenerative Energy System in Elevator Application
Authors: Wen Fang , Yang Sheng Yi , Chen Xiang Ping
Published: October 2011

Supercapacitors can harvest and return energy to power grid as elevator generator is operated with generating mode. This paper investigates energy storage technology of supercapacitors and presents a charge control strategy employing energy control regulation applied to Pulse Width Modulation (PWM) circuit. Experimental results illustrate that this strategy can fully satisfy the requirement in terms of charging supercapacitors safely, reliably and promptly.
Downlink Congestion Control for TD-SCDMA Trunking System
Authors: Zhang Ting Jian , Chen Mei Juan , Shao Shi Xiang
Published: October 2011

In TD-SCDMA trunking system, imperfect power control and user mobility are disadvantages for the capacity and performance of the system. In order to meet the requested Quality of Service (QoS) of group users, in this paper, we introduce a congestion control mechanism in downlink for TD-SCDMA trunking system. The mechanism is based on Adaptive Multi-Rate (AMR) mode selection and interrupt connections of users, analyzed in detail and verified by using MATLAB to structure a dynamic system level simulation platform. The simulation results reveal that system performance can be significantly improved.
Liquid-Phase Diffusion of Phosphorus Atoms in Laser-Doped Crystalline Silicon Solar Cells
Authors: Li Tao , Zhou Chun Lan , Liu Zhen Gang , Wang Wen Jing , Song Yang , Gao Zhi Hua , Duan Ye , Li You Zhong
Published: October 2011

In this paper, a nonlinear numerical model of laser melting of crystalline silicon solar cells and phosphorus diffusion has been established by finite difference method implemented in MATLAB. Based on the features of liquid-phase diffusion of phosphorus atoms in melting silicon, theoretical simulation for phosphorus concentration profiles and explanation for the mechanism of laser doping are achieved. The theoretical phosphorus concentration profile is in good agreement with the experimental SIMS data.
The Mixed Method Analysis of Higher Order Mode in Waveguide of Piecewise Homogeneous Dielectric
Authors: Shuai Chun Jiang
Published: October 2011

This paper presented the elementary principle and the computation for waveguide eigenvalues by using mixed method (Quadric-FE-BEM). A general computer program based on the mixed method is programed, as an application, the cut–off wavelength of higher order modes in the rectangular waveguide are computed and the calculation results are well in agreement with the theoretical value. It has been shown that the mixed method is an effective method to analyze waveguide eigenvalues in engineering. At last, the cut-off wavelength of higher order modes in TEM Cell of homogeneous dielectric is also analyzed.
Study on High-Voltage Power Supply of Plasma Generator
Authors: Jiang Chao
Published: October 2011

A novel Plasma generator is manufactured by Micro-hollow cathode discharge, and it will be used in industry as the contaminated gas disinfection devices. The power supply of the plasma generator is manufactured by high-frequency convertor technology with series-resonant power stage and parallel-load output. In order to improve the reliability of power supply, the mutual-lock circuit of two-switch device is designed. The effective modulation circuit is given in order to realize the many operation-modes of the plasma generator. The experimental results indicate that the power supply operates in resonant condition and realizes the zero current and zero voltage switching. The modulation circuit can adjust the operation-modes of the plasma generator, satisfying the demand of the plasma generator operation.
A Novel GNSS Carrier Tracking Loop Design Based on Fuzzy Logical Control
Authors: Zhang Jing Bo , Zhang Shu Fang , Hu Qin , Jiang Yi , Sun Xiao Wen
Published: October 2011

A differential phase error detector is inserted in the carrier loop structure for improving the dynamic performance of the loop in GNSS receiver in this paper. It is used to detect the abnormal phase jitter and amplify the adjusting increment for fast tracking. In order to avoid the differential detector amplifying noise interference in locking, fuzzy logical theory is introduced into the loop to control the amplification caused by the differential detector. Finally simulations show that the proposed design achieves high dynamic performance with effectively speeding up the tracking and widening the dynamic stress range.
Constant Pressure Water Supply System Based on Fuzzy-PID Control
Authors: Sun Xia
Published: October 2011

This paper combines the fuzzy control theory with the specific control object .We use MATLAB as the simulation platform ,and detailed research the application of the fuzzy adaptive PID control algorithm and the fuzzy adaptive - PID controller in the constant pressure water supply control system , provides a solution for the delay and nonlinear system.
Research on Designing on-Line Testing System of Automobile Engine Box
Authors: Li Yu Juan , Wang Bao Guang
Published: October 2011

According to the current situation that most kind of automobile engine box were taken off-line random testing and the key technology of on-line detection, after the analysis of precision index and geometrical tolerances, the on-line testing model has been made by us. According to the model: ① double array CCD have been used to calibrate the positioning pin holes; ② image processing measurement method based on linear CCD has been determined; ③ automatic control method in which grating control scanning step distance has been adopted to improve the accuracy of image collection; ④ image edge extraction algorithm has been used to realize automatic fast testing. Experimental results show that: effective and rapid precise measurement can be achieved.
A Self-Adaptive BMS Based on CAN-Bus for Power Li-Ion Battery
Authors: Wang Meng , Wu Jian Qiang , Zhang Xiao Hua
Published: October 2011

A self-adaptive battery management system (BMS) based on CAN-bus for power Li-ion battery was designed in this paper. It is designed distributed and composed of sampling modules, a master module and some aid devices. The sampling module is used to sampling the voltage of the cells and the temperature in the pack. And it keeps the temperature in safe range by controlling the fans in the pack. The master module receives the information from the sampling modules, samples the current of the main road, estimates the state of charge (SOC), the state of health (SOH), controls the main road relays. The modules communicate with each other by CAN-bus. The fault and temperature management are performed adaptively. It is shown that this self-adaptive BMS extend the battery lifetime and guarantee safe operation. And the self-power consumption is very low.
Research on Real-Time Measuring Method of Dynamic Deformation Based on Machine Vision and its Application
Authors: Lin Li Zong , Ni Xiao Peng , Zhou Luo Shan , Qian Zhi Qin
Published: October 2011

Dynamic deformation measurement of machine parts in fatigue strength test is studied by using machine vision technique. Considering the uncertainty of parts surface, we adopt circular mark to locate the object profile in order to obtain high quality images. Through some image pre-processing with linear filtering, continuous contour searching method and circular detection based on random Hough transform (RHT), the real-time deformation can be measured with image characteristic parameters. In the practical application, the deformation of the loaded bicycle handle-bar is calculated. The test results show that the machine vision measurement is very effective; measurement resolution attains 0.1mm/pixel; the discrete degree of measurement data is low and the system meets the requirement of real-time measurement. The study proves that the measurement method of dynamic deformation based on machine vision is feasible, which can give some help for fatigue strength test of machine part and other structure deformation.
Application of Cutter Radius Compensation in CNC Machining
Authors: Yue Qiu Qin , Yu Hua
Published: October 2011

According to the importance of cutter radius compensation in CNC machining, the principle of cutter radius compensation was discussed and the application and development methods in real machining were proposed in this paper.
Numerical Simulation of 2D Dam-Break Flow in a Vertical Plane
Authors: Liu Ming Qin , Liu Y.L.
Published: October 2011

This paper was concerned with a vertical two-dimensional (2D) flow model with free surface. The water governing equations were discretized with finite difference method. The function of volume method was employed to track the moving free surface. The model was used to predict the characteristics of dam-break flow in a 2D vertical plane. The surface profile and time averaged velocity were calculated, which shows the proposed model can be capable of capturing sharp water and gas interface configuration as time elapses.
Numerical Study of Non-Newtonian Liquid Sheet Primary Breakup
Authors: He L.P. , Xia Z.Y.
Published: October 2011

Dynamic atomization processes of non-Newtonian liquid were investigated by the method of numerical simulation. The full transient process of the primary instability, deformation, and fragmentation of free surface were simulated numerically by solving the Navier-Stokes equations using an algorithm based on the finite volume method. The tracking of the free surface was achieved using the volume of fluid (VOF) technique and the geometric reconstruction was based on the technique of Piecewise-Linear Interface Construction (PLIC). The continuum surface force (CSF) method was used to model surface tension. In this paper, atomization characteristics of non-Newtonian liquid were analyzed detailedly. The distribution of dimensionless potential length against time was obtained, and the dimensionless wavelength of primary waves was investigated.
Unscented Particle Filter Algorithm for Ballistic Target Tracking
Authors: Zhao Jun Wei , Zhang Ming Jun , Yan Yong Gang , Yan Yong Peng
Published: October 2011

At present, the ballistic Target tracking has a higher demand in convergence rate and tracking precision of filter algorithm. In the paper, a filter algorithm was improved based on particle filter. The algorithm was carried out from the aspects such as particle degradation and particle diversity lack. A novel ballistic coefficient parameter model was built, and was expanded to the state vector for filtering. Finally, the improved algorithm was simulated by MATLAB software. The simulation results show that the algorithm can obtain better convergence speed and tracking precision.
Design of Blank Thickness on-Line Monitoring System of Continuous Flat Press in Wood-Based Panel Industry
Authors: Wei Hong , Cao Ping Xiang , Guo Xiao Lei , Wang Bao Jin , Qiao Zong Ming , Hu Wei
Published: October 2011

On the base of appraising synthetically of measuring and testing technique and the monitoring system of thickness, the article analyzed the demand of thickness deviation. It also determined the control core of single chip, and studied on the on-line monitoring system of the wood-based Panel thickness, which is measured by laser sensor and differential transformer sensor and based on the technique of wireless sensors in order to develop monitoring precision and automation standard of blank thickness in wood-based panel industry.
SAGE Model Analysis and its Application in Civil Aviation Engine Emission
Authors: Cao Hui Ling , Tu Xun Lai , Liang Da Min , Ma Yong Feng , Xue Peng
Published: October 2011

Aero2k and SAGE model havebeen developed in the contemporary society when emissions attract extensive attention, especially on aviation emissions. In this paper, origin and functions of SAGE model are introduced simply, while its calculation model is analyzed in detail. Based on SAGE model, process analysis of calculating aviation emissions has been made and Calculation procedure has been designed, then software about calculation of aviation emissions has been developed according to the procedure. There is no much deviation between true values and results based on the software, which is a good proof of feasibility of the software.
A Phytoplanktonic Investigation and Water Quality Assessment about Tanjiang River
Authors: Wang Hong Wei , Zhang Wei , Li Kai Ming , Zhou Yong Gang , Xu Hai Ming , An Shan , Ma Liang
Published: October 2011

A phytoplanktonic investigation of Tanjiang River was conducted in March 2011. 202 species of phytoplankton belonging to 86 genera and 7 phyla were identified altogether. Chlorphyta and Bacillariophyta which occupied 36.14% and 43.56% of the total number were the most, indicating that the green algae and diatom were the dominant group. Tanjiang River was β-meso-polluted to oligo-polluted judging from phytoplankton community while it was clean or light-polluted judging from Shannon-Weaver diversity index, Margalef diversity index and Pielou evenness index. Tanjiang River was light-polluted or oligo-polluted judging from the above indicators in normal water season, but there has been a trend to β-meso-polluted.
A MIL-STD-1553B Bus Command Optimization Algorithm Based on Load Balance
Authors: Zhang Jian Dong , Liu Ming Yang , Shi Guo Qing , Pan Wei Hua
Published: October 2011

The paper, based on the MIL-STD-1553B bus communication protocol, makes the computer-aided analysis to optimize bus transmission algorithm. An optimized algorithm is proposed by rearranging the commands set by the bus controller (BC), achieving the bus load balance in a major period. Through the command sequence optimization, this algorithm could manage the commands to be transmitted and generate an optimized bus command table. Based on the algorithm, software used in the PC is development, which could manage the commands to be transmitted, and generate optimized command table for bus communication transmission. The actual application shows that this algorithm can do well in optimizing the bus command table and improve the efficiency of bus transmission.
Structure Design and Test of the High Pressure Vessel for Corrosion Testing
Authors: Cui Shun , Wang Shi Feng , Zhang Jun Liang , Liu Hui , Li Zhong Kui , Xia Ming Xing
Published: October 2011

This paper have completed the structural design of the GF3.5 25/500, and the cover of the high pressure vessel, flange, the body of the high pressure vessel was stress check, security check, the last combination of pressure tests, air tightness test, Commissioning completion of the three major test the final design.
Design of Environmental Information Monitoring System Based on ZigBee CC2430
Authors: Ni Sang Chen , Zhang Yue
Published: October 2011

Focused on environment parameters information of large dead-time and inertia, in this paper, the multi-parameters monitoring system of low-power wireless communication technology based on ZigBee CC2430 was designed. System uses a star topology network. By placing network nodes in monitoring area, the monitoring center collects monitoring information to achieve data analysis and management. The realization mathod of wireless nodes and data transmission and communications is presented. Experimental result shows that the performance of this system is quite stable and could be widely used for automatic monitoring in other environment places.
Mechanisms of 3-D Internal Cracks Growth and Coalescence in PMMA
Authors: Wang Ming Li , Yang Xiu
Published: October 2011

Several experiments undertaken on cement and mortar samples with internal cracks of different shapes and sizes demonstrated that 3-D cracks growth in compression was qualitatively different from the 2-D cases. This paper employs pre-existing cracks in frozen PMMA（polymethylmethacrylate plastic） which are produced by the mechanical method to analyze the evolution of the boundary effect of PMMA and to study the mechanisms of cracks growth and coalescence. In the experiments, 3-D cracks are tested under uniaxial compression and finally draw two conclusions about failure mechanisms of PMMA and brittle materials.
A Design of Micro Magnetic Detection and Localization System
Authors: Wei Shuang Cheng , Deng Jia Hao , Pan Yan Hua
Published: October 2011

Magnetic detection and localization is becoming a hot point in the past twenty years. Amorphous wire is a promising material to produce high performance magnetic sensor for GMI effect. A high sensitivity micro magnetic sensor is designed and a processing circuit is presented in this paper. Based on the processor TMS320F28335, the magnetic signal of ferromagnetic target can be sampled and processed.
Based on Taguchi Analysis for High Power LED Liquid-Cooling System Design
Authors: Hung San Shan , Chang Hsing Cheng , Huang Jhih Wei
Published: October 2011

The main result of this study is to propose a liquid-cooling system for high power LED heat dissipation treatment. By using thermal dissipation mechanism and based on ANSYS CFX numerical analysis of change the parameters of cold plat. We will get the optimal heat dissipation structure. The experimental results show that the Taguchi method of thermal mechanisms in this study of the four control factors affecting the order: k value of thermal compound > fan power > liquid type > pump flow rate, and to identify the best combination of factor levels. When the heat source is 90 W, the best factor of the experimental cooling system thermal resistance is 0.563K/W. Nomenclature
Optical Path Analysis of the Optical Fiber Bundle Hydrogen Sensor
Authors: Cui Lu Jun , Shang Hui Chao , Zhang Gang , Chen You Ping
Published: October 2011

The present work investigates reflectivity and optimal reflective distance of optical fiber hydrogen sensor in over 0～4000um range. The approximate equality of reflective distance in two optical paths increases signal to noise ratio for optical hydrogen sensor, the fabrication of optical path could eliminate the internal noise and external interferences, and provides higher stability for hydrogen sensor. Through a series of simulation experiments it was found that different reflective distances determine the sensitivity and amplitude response of hydrogen sensor. When the reflective distance was about 1mm in optical path, the sensitivity of optical hydrogen sensor could reach the peak value.
Application of WNN in Ring Ball Gratings Torque Sensor’s Signal Demodulation
Authors: Wu Yong Feng , Yu Hong Lin , Li Xiao Dong , Kang Zhi Ping
Published: October 2011

The components structure and principle of ring ball gratings sensor is put forward for the present state that there still has not a better method to detect torque under the extreme environment in domestic. According to the localization property in time and frequency domains and the translation invariant property, the preprocessed signal of sensor is decomposed with multi resolution, and the signal is reconstructed with wavelet under the intervention of neural network. The wavelet neural networks (WNN) model is constructed and the algorithm routine is realized in laboratory virtual instrument engineering workbench (LabVIEW). With the testing device, the demodulation experiments are carried out for the corresponding sensor signals when the shaft is continuous rotated along the same direction, rotated along the alternate direction and knocked. The results indicate that the demodulation effect and confidence level are very well.
Calibration Principle and Implementation Method Based on MMA7455L
Authors: Song Man , Zhang Yang , Wu Xiang Long , Ding Xi
Published: October 2011

This paper introduced a general calibration principle based on Freescale MMA7455L acceleration sensor, and generated specific implementation method.
Adapted Genetic Algorithm and 5 Levels Control Combined Low-Speed Improvement Direct Torque Control
Authors: Wang Wei Ran , Liu Xian Xing , Wang Hong Bo , Zhu Xin
Published: October 2011

Direct Torque Control (DTC) has an important role in current motor control. This paper focus on its torque ripple of the reference vector made, summarize a 5 levels structure and novel strategy. This strategy can generate one 5-level, sectors subdivision’s vector table and select the best vector to obtain the best effect. On this basis, combined with adapted genetic algorithm and calculate optimal parameters for the speed controller. In the end, give an example of induction motor. The results show that: the conclusion is correct, the control structure is simple, clear and perform significantly. It means that the strategy is feasibility and correct.
Design of Diseases and Pests Therapeutic Instrument of Solar in Greenhouse
Authors: Wang Yong Qing , Chong Na , Wang Shi Yuan , Zhang Lei , Xiong Jing Feng
Published: October 2011

On account of pests and diseases in greenhouse, solar cells were used for energy. Ozone was generated by corona discharge during the day which used to kill bacteria, viruses, fungi in greenhouse. Use the phototaxis lure insects with blue-violet LED, high power electrical shock to kill flying insects in the evening. Thereby reduces crop diseases and pests and reduces pesticide use. Greenhouse diseases and pests therapeutic instrument of solar consist of power supply module, ozone generator module, high voltage pest control modules. Paper focuses on the principles of the design, tentative design, function test and measurement data analysis.
Robust Adaptive Beamforming Imaging Approach for Stepped-Frequency through-the-Wall Radar
Authors: Li Shu Ming , Liu Xian Feng
Published: October 2011

A robust Capon adaptive beamforming imaging method was proposed for stepped-frequency through-the-wall radar. According to the ideal of robust Capon beamforming (RCB) under the steering vector uncertainty set, Capon optimal weight vector in frequcency domain is obtained by accurately estimating Compensation function vector. Then signal energy is estimated by freqency weighting, and coherence factor (CF) weighting is applied to suppress sidelobe level. Therefore, this method not only achieves higher resolution and much better interference suppression capabilities, but also improves imaging contrast.
Exponential Sampling: A Gibbs Phenomena Removal Model for Finite Rate of Innovation Sampling Framework
Authors: Qian Hui , Yu Lun
Published: October 2011

We propose an exponential approximating function as a sampling kernel with finite rate of innovation. The performance of reconstruct non-bandlimited signals from its low frequency components would inevitably induce Gibbs phenomenon. This paper establishes the theoretical model on relationship between sampling kernel filter and parametric reconstruction method of non-bandlimited signals, and designs a new window function exponential sampling kernel filter to removal Gibbs Influence. Simulation results show that, compared to Sinc sampling kernel filter, the reconstruction ability of exponential filter based finite rate sampling system is improved under the white Gaussian noise environment.
Analysis of Manufacturing Systems with Parallel Unreliable Machines and Finite Buffer Based on Matrix-Analytic Method
Authors: Liu Jia Lu , Wu Ai Guo
Published: October 2011

This paper presents a model of manufacturing system with two parallel workstations. The machines in the system are non-identical unreliable machines, and the processing times, failure times and repair times of the machines are assumed to be exponentially distributed. We show that such model can be considered a quasi-birth-death process (QBD) with a tri-diagonal block structure generator matrix. The solution method for the QBD process is a matrix-analytic method chosen based on the characteristic of the parallel system. At last a two station one buffer case with three parallel machines at each station is given to show the accuracy and efficiency of the proposed method.
Application of PLC in Material Automatic Sorting System
Authors: Zhang Ming Zhu , Wang Qiang
Published: October 2011

In this paper a PLC control system is designed to control the sorting, transmission and loading/unloading in the manufacturing, in view of the defects of the relay control system which usually has poor reliability and bad flexibility in use. On the basis of the superior performance of PLC control system and the working principle of frequency converter, AC transducer drive technology is applied to achieve stable starting, reliable operation and low breakdown rate in the assembly line of manufacturing. In the design of the upper monitoring system, the functions of parameter settings, process monitoring and control, data processing, fault location can be well implemented via configuration software. The research work of this paper will lay a solid foundation for the design of material automatic sorting system based on the PLC controller.
Study on Multi-Crystalline Silicon Textured by Ultrasound
Authors: Chao Yan , Wu Li Qun , Luo Xiao Lu
Published: October 2011

Surface texturing of silicon can reduce the reflectance of incident light and increase the conversion efficiency of solar cells. Many approaches have been present in texturing silicon solar cell. In this paper, ultrasound is introduced into acid solution to texture the surface of multicrystalline silicon (mc-Si) solar cell. The morphology images are obtained by scanning electron microscope (SEM), more holes and regular distributed morphology for the presented method can be observed. Antireflectance of the mc-Si surface is measured by spectrophotometer, and the reflectance of 10.2% is obtained for the presented method, which is much less than that of acid etching.
Computer Aided Automotive Interior Design for Kansei Engineering
Authors: Zhu Li Hong , Zhao Han , Yin Xiao Chen , Zhu Li Jun , Zhang Liang
Published: October 2011

Nowadays, the development of automotive industry trends more personalized and profuse product alternatives. Kansei Engineering has been applied to interior design for customer satisfaction based on ergonomic technology in the paper. The computer aided design automotive interior system includes two subsystems: one is Computer-aided Sensation Survey Subsystem and the other is Computer-aided Automobile Interior Design Subsystem. Mathematical statistics and quantitative analysis method are adopted to establish quantified relationship between product perceptual image and design parameters.
Analysis and Design of a Novel High-Power W-Band Spatial Multilayer Doubler
Authors: Deng Jian Qin , Jiang Wan Shun , Ning Yue Min
Published: October 2011

A novel spatial multilayer doubler is proposed in the paper. It is designed by tray approach in rectangular waveguide. The doubler consists of multilayer multiplier circuits, which are parallel each other. Comparing with traditional single layer doubler, the spatial multilayer doubler has higher 1dB compression point, so the output power can be increased when input power is increased. Both the input port and the output port of the doubler are rectangular waveguides. In order to achieve the transition from rectangular waveguide to planar circuit, the finline and ridge are used. Multilayer finlines act as divider, which couple power from input rectangular waveguide. Otherwise, multilayer ridges act as combiner, which combine the harmonic power to output rectangular waveguider. The passive circuits of the spatial multilayer doubler are modeled and analyzed with FDTD method. From the results, we can see that the passive circuits designed in the paper have very low insertion loss.
DMC Based MPC Control of Refrigeration System
Authors: Zhai Wen Peng , Wu Ai Guo , You Yu Wen
Published: October 2011

The methods and theories about reducing energy consumption of buildings are some of the most popular topics for green buildings research recently. Vapor compression chiller, the largest proportion of building energy consumption, as the design and running characteristics, work at part load for most of the time. To improve the energy efficiency at part load, this paper details some efforts to develop a linear MIMO model of a vapor compression system suitable for MPC control method. Experiments show that the controller can simultaneously achieve satisfactory transient response in the evaporating temperature and superheat, and improve energy efficiency at steady state.
A New Feedback Gain Designing of Speed Adaptive Full Order Observer for High Speed Operation of Induction Motor
Authors: Yi Ou Yang , Maerz Martin
Published: October 2011

Much more investigation is done in the low speed operation of IM. High-speed operation is rarely paid attention; since it is assumed that the IM would work successfully in that area. However, the high-speed operation of IM with conventional feedback designing behaves not so well and presents oscillation situation, due to inappropriate placement of eigenvalues of flux observer and deterioration of speed adaptation mechanism. Correspondingly, considering the saturation effect of main flux, this paper proposes a new feedback designing method and improved speed adaptation mechanism.
Analysis of the Automobile’s External Aerodynamic Noise Field Characteristics Based on CAA
Authors: Zheng Zheng Yu , Li Ren Xian
Published: October 2011

This paper dwelled on the principle of Computational Aero-Acoustics (CAA), and utilized the Boundary Element Method (BEM) combined with the Computational Fluid Dynamics (CFD) based on Lighthill’s analogy to the automobile flow model, and converted the fluctuating flow pressure near the vehicle’s surface into the dipole source boundary condition in acoustics grid, and eventually succeeded in simulating the external aerodynamic noise field of automobile by introducing the dipole source boundary condition into the automobile’s BEM model. The distribution of vehicle’s external aero-acoustics field and the directivity of vehicle’s surface aerodynamic acoustic dipole source were also discussed carefully in this paper. The results show that: The head and tail of car are the main aerodynamic noise source radiation areas, and most of the dipole source’s SPL value is more than 70dB; the variation in car speed greatly impacts on the directivity of aerodynamic noise field near the car’s tail surface (θ=165°~195°).
Study of the Squeeze Film Damper of Larger Flow Rate High-Speed On/Off Valve
Authors: Jiang Hai Bing , Ruan Jian , Wu Ming Ming , Wang Tao
Published: October 2011

A new type of squeeze film damper (SFD) is designed to reduce spool’s impact and vibration which happen in the two-stage larger flow rate high-speed on/off valve with the 450 L/min flow rate and 8ms turn-off time, the valve’s sealing performance、reliability and service life improve largely, and the valve’s response speed doesn’t drop. The simulated and experimental results show: The damper has optimum buffering performance when oil film thickness is 0.1mm, and the spool closing process approach ideal state. The valve will has a great potential application in the powerful occasions because of it's perfect performance: larger flow rate、fast response and novel damper.
Confirmation Research on Robustness Speaker Based-on Normalized Autocorrelation Voice Selection
Authors: Gu Cheng , Wang Shan
Published: October 2011

This paper gives a new algorithm that based on normalized autocorrelation robustness selection. Aiming at the situation that the voice was vitiated by noise and the difference of pollution extent between different parts of the voice, we recognized that preserving the polluted parts of voice will bring in negative affection to the confirmation system of speaker. Normalized autocorrelation not only shows the correlation of short-time voice frame, but also shows the polluted extent of voice. As a result, we can wipe off the deeply polluted voice through the normalized autocorrelation. Experiments have shown that through the procedure of normalized autocorrelation we can not only wipe off the polluted voice, but also improve confirmation ability of speaker in high noise environment.
Research on Computer-Aided Design of Axial Turbine Blades with Ultra-Low Specific Speed
Authors: Liu You Yu , Han Jiang , Zhang Gou Zheng , Ye Wen Gang
Published: October 2011

To solve the problem that hydropower stations equipped with propeller turbine are not able to work under small flow conditions in dry seasons, after analyzing the influencing factors, a rebuilding scheme for decreasing capacity to increase efficiency is proposed. The distribution of velocity circulation at the inlet and the outlet is researched in this paper. Some key technologies in computer-aided hydraulic design, including unfolded aerofoil converted to cylindrical surface and intelligent extension for curves, are solved. The proposed version is feasible and the composed CAD software is reliable and accurate.
Research and Design of Color Restoration Algorithm for Demosaicing Bayer Pattern Images
Authors: Zhu Bo , Wen De Sheng , Gao Wei , Song Zong Xi , Li Hua
Published: October 2011

This paper analyses the process of obtaining real color image based on a single CCD/CMOS sensor. Bayer CFA Interpolation algorithm and White Balance algorithm are presented. The proposed interpolation algorithm which can obtain better color image and is easier to implement by hardware is provided. In order to cancel chromatic aberration, one White Balance algorithm which aims at sequential image is presented and process of FPGA design is given. Experimental results show that the design works normally. The color of corrected picture is vivid compared to the real world.
Numerical Simulation of Valve Timing and Size on a Compressed Air Engine Performance
Authors: Qian Ye Jian , Zuo Cheng Ji , Chen Zhi Fang , Xu Hong Ming , Wyszynski Miroslaw L.
Published: October 2011

The compressed air engine is receiving increasingly worldwide attention because it takes advantage of renewable energy and has zero exhaust emissions. This paper presents a systematic study on valve timing and size of a prototype compressed air engine for optimizing its efficiency and performance. An in-house air engine system model has been developed using the FLOWMASTER platform. The simulated results show that the optimizing valve timings is probably the most critical requirement in the compressed air engine design process.
The Transient Temperature and Thermal Stresses on Metal Material Irradiated by Multi-Pulse Short Power
Authors: Xu Guang Ying
Published: October 2011

Based on the non-Fourier law and thermo-elastic theory, the non-Fourier expressions of the temperature field and the thermal stress field of metal material under multi-pulse laser irradiation were deduced. Taken stainless metal and two pulse width (ω=4ps,4fs) as an example, The effects that distributions and variations of transient temperature and thermal stress are influenced by laser pulse width are studied. The results show that the magnitude and frequency of transient temperature and thermal stress are seriously affected by the laser pulse width. More narrower the laser pulse width, faster and higher the local temperature rise; as well as the thermal stresses.
Contact Stresses Analysis between Glass Panel and Upright Fitting Roller Gabled with Different Hyperelastic Materials
Authors: Chao Lu Ping , Hsiao Ming Chih , Chen I Ju , Wu Hung Yi
Published: October 2011

This study proposes an approach to analysis the stresses distribution between the fitting roller and glass panel for a vertical panel attachment manufacture modulus under varied loading conditions as depicted in Figure 1. The fitted roller gabled with different rubber materials included Polchloroprene rubber (CR), nature robber (NR), and Polyurethane (PU), with the hardness 60, 70, 80 IRHD, respectively, The ANSYS and LS-DYNA software are adapted herein to simulate the contact stresses between fitted roller and glass panel. The external loading applied in rubber coated roller is from 1kg up to 5kg. The simulation results of the contact stresses, included pressure stresses and shear stresses, can understand how to achieve the uniform pressure situation between the fitted roller and the glass panel. Therefore, the compactness between the polarizer and the glass panel will reach perfect condition with no air bubbles left.
Optimal Design of Disc Cutter Structure Parameter Based on Genetic Algorithm
Authors: Xia Yi Min , Wu Feng , Cheng Lei , Zhang Zheng Hua
Published: October 2011

Because of the situation that the disc cutter bearing seriously damaged in the cutting process, disc cutter structural parameters is optimized which mainly affect the force on the bearing. The disc cutter cutting edge angle, cutting edge width, transition arc radius and caulking ring width between the bearings are taken as design variables, and the minimum equivalent load on the bearing as the target, the optimization model is established. Genetic Algorithm (GA) is used in the mathematical model.Finally, the optimized results indicate that the equivalent load on the bearing reduces 21% compared with the actual structural parameters. So the optimization results effectively reduce the force on the bearing and extend the life cycle of disc cutter.
The Method Study of the Virtual Roaming Based on 3ds Max and Virtools
Authors: You Lu , Xu Han
Published: October 2011

This article has designed a hypothesized outdoor landscape roaming based on 3dsmax and virtools hypothesized landscape roaming method study specifically. It has simultaneously pointed out the modeling and bestows on the material quality, foundation the light the matters needing attention when 3ds max as well as when these two software Intermediate-range enters, derives the method and the skill, finally introduced how to realize hypothesized landscape roaming in virtools.
The Research and Development of an Exam-Integrating System Based on .NET-Test Library
Authors: Zhao Mei Hong , Ren Jian Ping
Published: October 2011

In order to implement Exam-Integrating system with the function of auto generating papers, in this paper, we propose a program which processes the non-text information in the system such as complex formulas and graphics. The program takes model of reflection technology, with the use of ASP .NET technology and SQL Server 2005 database. The system completes both test library by hand and Exam-Integrating by specified parameters, and then generates the paper by automatically computer type setting.
An Event-Driven SOA Based Service Integration Framework for Provision of Active Services
Authors: Zhu Da , Zhang Yang , Cheng Bo , Chen Jun Liang
Published: October 2011

The tendency of future communication network is to set up an environment supporting network convergence as well as dynamic service collaboration. The recent Internet of Things (IoT) visions makes provision of User-Centric and active service to common users an important aim. Service-Oriented Architecture (SOA) based on Web service technology works well for provision of request/response style passive service. However, services and devices in IoT or mobile environment may dynamically interact and cause a considerable amount of states changes, which calls for an active and more flexible framework to enable interactive service provision. In this paper we propose an Event-driven SOA based service integration framework (EDSIF) for provision of active service. Compared with traditional SOA based service provision method, this approach will facilitate real-time event processing as well as intelligent service coordination. We present the concept model of Event-driven SOA and the key components of EDSIF. We also illustrate the ECA4IoS rules for active service execution and the enhancement work of WSN broker towards an effective EDSIF.
Accumulate-Repeat-Delay-Partial-Delay Codes
Authors: Li Zhong Liang , Xia Guo Jiang
Published: October 2011

Inspired by Accumulate-Repeat-Accumulate (ARA) codes, in this letter we propose a new channel coding scheme called Accumulate-Repeat-Delay-Partial-Delay (ARDPD) codes. Contrary to ARA codes, ARDPD codes simultaneously achieve good threshold and linear minimum distance. Based on EXIT for LDPC codes, we show that for maximum variable node degree 5, the threshold of ARDPD codes outperforms the best known unstructured irregular LDPC codes. Iterative decoding simulation results show that the proposed codes perform as predicted.
Adaptive Objective Coordinate Optimization Method with Unknown Parameter
Authors: Wang Biao , Wang Chang Qing , Ru Feng , Ma Xiao Lan
Published: October 2011

Multiple has accused of unknown parameter optimization problems of implementation of the object. Containing identification link should adaptive objective coordinate optimization control system. The local objects in decomposition based on optimizing, application target coordinate law to selected optimal criteria based on the minimum value to ensure coordinated operation in the process of making optimal index for global convergence, achieve the purpose of overall optimization. In order to execute real time on-line identification, Recursion least square method (RLS) could be used for the estimation of object parameter in the identification section.
An FFT-Based Approach for Carrier Frequency Domain Acquisition in Spread Spectrum TT&C System
Authors: Wu Xing Cun , Gong Ping , Song Hai Jun , Zou Hui Zhi
Published: October 2011

Acquisition time of precision ranging code is long under the conditions of large Doppler shift, the carrier frequency domain FFT-based fast acquisition theory was analyzed, and the method of carrier Doppler compensation estimates to complete the PN code Doppler compensation was directly used in spread spectrum ranging signal acquisition. Comparing with the traditional parallel acquisition approach, the Doppler frequency estimation accuracy and acquisition speed is greatly improved, the acquisition time is shorter than long code segment with the traditional parallel acquisition method. Comparing with the method of short code supporting for long code, the channel energy is saved.