bluuebunny/crossref_metadata_2025 huggingface dataset:
Texturing of Multi-Crystalline Silicon Wafer by Ultrasonic Standing Wave
Authors: Chao Yan , Wu Li Qun
Published: October 2011

Nowadays solar energy receives more and more attention for its clear, non-pollutant and renewable characteristics. Although the production cost of electricity by solar cell is much higher than those by fossil fuels currently, solar cell has partly substituted traditional energy and be used in some fields. Silicon wafer surface texture act an important role in solar cell, which can trap the incident lights and influence the photoelectric conversion. In this paper, a new method using ultrasonic standing wave is present based on the previous researches. The acid molecules are droved to distribute regularly in terms of the standing wave. Then regular morphology can be textured on the surface of mc-Si by the acid molecules etching with silicon. SEM experiment illustrate the present method can texture regular morphology on the surface of multi-crystalline silicon (mc-Si) , also the antireflection of 9.4% is much lower than that of traditional acid etching.
Evaluation Architecture and Method of Quality Survival and Development Index for Product
Authors: Kui Zhao , Zhao Kui , Yang Jiang Xin
Published: October 2011

This paper proposed the concept of quality survival and development index. The evaluation indicators system for quality survival and development index was established which includes customer satisfaction indicators of micro-environment and quality fitness Indicators of macro-environment. Breaking the traditional limitations of quality studying that focus only on customer satisfaction rather than from a macro perspective to evaluate the quality of products. Combining micro-environment and macro-environment together to established a mathematical model of quality survival and development index. Finally, an example of CNC machine tools was employed to analysis, utilizing fuzzy comprehensive evaluation method. Through all this, we validate this method of evaluation index system practicality and effectiveness.
The Antivibration of Deeper Solt Milling System Experiment Research
Authors: Gou Zhi Jian
Published: October 2011

The cutting vibration is a very harmful phenomenon, which destroys the surface finish and dimensional integrity of workpieces and quickens the wear of cutting tool. The cutting vibration can be suppressed or reduced by applying the variable spindle speed cutting. In order to investigate the effect of variable spindle speed parameters and cutting conditions on suppressing the vibration, the deeper slot milling tests have been conducted. The results have shown that the vibration occurring in deeper slot milling can be reduced by applying the method of variable spindle speed milling, as long as the variable speed parameters are elected suitably. The values of speed variation amplitude Δn/n0 and speed variation frequency fn of spindle speed trajectory parameter have a great effect on antivibration. Under this article test condition, the amplitude Δn/n0 of variable spindle speed is 20% and frequency fn of variable spindle speed is 0.3Hz.
Simulation and Parametric Analysis of Vegetable Seedling Transplanting Mechanism
Authors: Wang Shi , Li Cheng Hua , Gao Wei
Published: October 2011

In order to understand the performance of vegetable seedling transplanting mechanism, the movement of vegetable seedlings passing through seedling system was simulated based on Pro/E and ADMAS software. The equation of displacement and velocity of vegetable seedling were deduced. A nutrient soil bowl model of vegetable seedlings and a real size model were developed. We designed the parameters of vegetable seeding transplanting mechanism by theoretic analysis and optimum parameter. The validity of the parameters was demonstrated by simulation on the transplanting mechanism. The research can provide valuable theoretical principle for the parametric design, optima design and experiment of the vegetable seedling transplanting in the future.
Solving Intrinsic Parameters of Camera Calibrated from Controlled Motion Sequences and Homography
Authors: Ge Dong Yuan , Yao Xi Fan , Xiang Wen Jiang , Liu Yuan
Published: October 2011

A camera calibration based on controlled motion sequences and homography is adopted. First condition of unique solution for constrained equation set is proofed. Then two sets three orthogonal motions are carried out for camera in manipulator, thus 6 homographic matrixes of plane are obtained at 7 view points, and thus the intrinsic parameters of camera are achieved. The experiments on real images validate our technology based on homography.
The Damage Finite Element Analysis of Eutectic Composite Ceramic Containing Lamellae
Authors: Zhang Shu Qin , Ni Xin Hua , Liu Xie Quan , Ma Ying Chen
Published: October 2011

According to microstructures in eutectic composite ceramic, the finite element model of composite with eutectic interphase is established. The mechanical stress field of eutectic composite ceramic containing lamellae is simulated. APDL programming in ANSYS is used to analyze the damage process of eutectic composite ceramic. Results show that the failure of eutectic composite ceramic is determined by the damage of matrix. As load is increasing, the damage will elongate along the interphase and extend to the internal of matrix. At last the damage arouses matrix fracture.
Structural Optimization Based on Static Design Criteria of a Long Span Mobile Bridge Using Genetic Algorithm
Authors: Jang Sung Hyun , Hwang In Wook , Kwon Bong Chul , Kim Soo Tae , Choi Young Hyu
Published: October 2011

Long span mobile bridges (LSMBs) are widely used in military maneuver operations or civil rescue works across narrow gorges or rivers. Especially it is quite a difficult problem to design LSMBs of over 50 m length satisfying required safety criteria under military load class 70 (MLC 70), namely permit vehicle weight of 63.5 tons. In order to optimize a LSMB of 60 m length for both lightweight and minimum deflection under MLC 70, a multi-objective optimization process based on genetic algorithm (GA) and weighted sum method for handling multiple objectives was utilized after its validity verification with the six-member and five-node truss problem. GA in this study utilized a variable penalty function to treat design constraints and fitness function to deal with both objective and penalty functions together. Finite element structural analysis of the LSMB was done by ANSYS for the design optimization process. As the result, the optimally designed LSMB of 60 m span that meet requirements and safety criteria of a military bridging equipment design and test code has been successfully obtained.
Finite Element Analysis and Optimization Research of Mounting Bracket of a Mini Van
Authors: Liao Shu Hua , Cheng Chuan Sheng
Published: October 2011

Powertrain mounting bracket is a vital part in the car, its strength is more important for the vehicle lifetime, and lightweight is becoming the aim of structure design. According to the optimization design idea, a common formula of size optimization was deduced. And the structure of the mounting bracket was analyzed by using Optistruct software and the bracket in real work condition was studied. In the premise of meeting the stress, the optimal design of the bracket was finished. And the result show that the optimal design is right and reasonable, the quality of optimized bracket was reduced 37.28%, and achieved good results.
Three-Dimensional Extended Analysis and Life Prediction of Gear Crack
Authors: Ma Jie , Shao Ren Ping , Dong Fei Fei
Published: October 2011

Based on the linear-elastic fracture theory, the fracture damage of gear structure is studied. By using the professional fracture analysis software FRANC3D, a three-dimensional propagation analysis is investigated for tooth root crack in involute gear, and also solving the three types of stress intensity factor(SIF) in tooth root semicircle crack tip, its changing rule and the 3D stress intensity factor formula are obtained. On this basis, a simulation analysis and study is conducted on propagation route of 3D tooth root crack, and the correctness of the analysis results is verified by comparing with the experimental results. Finally according to the mutation of maximum stress intensity factor in the crack tip，the fracture damage of gear teeth is predicated, and its working life is forecasted. By analyzing the different crack size, it is concluded that crack propagation velocity is very sensitive to crack initial length; initially, crack propagation slowly grow, with the increasing of crack length, the crack propagation will rapidly accelerate. The cycle life of fatigue crack in involute gear is about 1.85E5 times. All these findings have important significance for life estimation and failure detection of gear.
UKF Filtering of UAV MEMS Gyro Based on Time-Series Model
Authors: Xu Jia , Li Qing
Published: October 2011

The algorithms and the applications of UKF filtering of UAV MEMS Gyro based on time-series model are presented in this paper. First Gyro output signals are preprocessed and modeled by time-series analysis theory, and then use UKF filtering method to compensating error based on the time-series model. Examples with actual experiment demonstrate that the method has apparent superiority. The simulation result shows that, both in static and dynamic cases, after eliminate the precision error MEMS gyro accuracy can achieve the miniature UAV standards.
The Process DNA Model of Significant Model Project
Authors: Huai Bin , Yang Hai Cheng , Wan Neng
Published: October 2011

To solve the problem of “two command line” existing in the significant model project management at present, this paper proposes a method of process DNA-based process management for significant model project. First, the technology process and management process of significant model project are analyzed. Second, the process DNA double-strand of significant model project is constructed employing the elements of technology and management as building blocks; and also, the two-level structure of the process DNA double-strand is analyzed. Third, the process DNA model of significant model project is established and the related formal definitions are given.
The Ultimate Stress of Small Grain Shellproof Ceramic Composite
Authors: Liu Qiong Xi , Yang Jian Feng
Published: October 2011

According to the microstructures of small grain shellproof ceramic composite, the effective self-consistent method is used to determine the effective stress field of the shellproof ceramic composite. Based on the effective stress field and fracture feature of small grain shellproof ceramic composite, considering the mechanism of growth and coalescence of microvoids, crack nucleation model of the shellproof ceramic composite is built. Under the effect of shearing stress, dislocations slip along slip plane and pile up in matrix grain boundary. Owing to the stress concentration before leading dislocation, there is a stress field around the stress concentration. Letting the maximum tensile stress equal to the theoretic fracture strength of composite matrix, the ultimate stress of small grain shellproof ceramic composite is obtained.
An Ontology-Based Data Mining Framework in Traffic Domain
Authors: Wang Ru Guang , Dai Wei Di , Cheng Jie Ru
Published: October 2011

Traditional data mining often focuses on the research of models and methods without considering of specific requirements in the field. This paper proposes a data mining framework in traffic field—Traffic Domain Data-Mining Framework (TDDMF) which is a domain-driven data mining framework based on ontology. The ontology model for traffic domain data based on TDDMF is also built in the paper. A prototype system is developed to prove the availability and effectiveness of TDDMF.
A More Effective Technique of Design Synthesis for MEMS with Expected Performance
Authors: Chen Shu Xun
Published: October 2011

A design synthesis technique based on sensitivity for Micro-Electro-Mechanical Systems (MEMS) proposed. This new technique can be called Sensitivity-Based Direct Solution Algorithm (DSA) of design synthesis for MEMS with expected performance. Design synthesis with expected performance is regarded as a reverse problem of MEMS analysis. Behavior equation group can be educed from analysis equations. This behavior equation group can be solved using any solution algorithm of non-linear equation group. Newton Iteration Method based on sensitivity is adopted. Comparing with Genetic Optimization Algorithm (GA) , computational workload of DSA is greatly decreased.
A Novel Intelligent Modeling Method for Wood Drying Process
Authors: Zhang Dong Yan , Zhang Chun Yan , Zhu Liang Kuan , Diao Zhi Duo
Published: October 2011

This paper investigates the development and intelligent modeling problem for a wood drying kiln process via optimized support vector machine (SVM). Based on parameters optimization and model selection idea, the swarm intelligence algorithms of Particle Swarm Optimization (PSO)-SVM and Genetic Algorithm (GA)-SVM were proposed for wood drying process with strong coupling and nonlinear characteristics. The simulation results showed that both of these two kinds of swarm intelligence optimization algorithm could get the appropriate parameters of SVM effectively, and by contrast, PSO showed a better learning ability and generalization in wood drying process modeling, and could establish predictive model with better accessibility.
Co-Deposition of Al–Ni Alloy in NiCl2-AlCl3-1-ethyl-3-methylimidazolium Bromide ([EMIM]Br) Ionic Liquid
Authors: Zhang Li Peng , Yu Xian Jin , Ge Zhi Wei , Dong Yun Hui , Li Dang Gang
Published: October 2011

Al-Ni Alloys were obtained from NiCl2-AlCl3-1-ethyl-3-methylimidazolium bromide ([EMIM]Br) ionic liquid at room temperature. The analysis of Al-Ni alloys that co-deposited at different potentials for 2h were performed using Scanning Electron Microscopy (SEM) and X-ray diffraction analysis (XRD). It appears that Ni has been rapidly solidified in the alloys and homogeneous Al-Ni alloys can be obtained at room temperature. As increasing the overpotential, the amount of Ni in the alloys was decreased whereas the amount of Al was increased. The chloride pitting potentials of alloys with the molar ratio of NiCl2/AlCl3/[EMIM]Br 0.03:2:1 was approximately 0.3 V more than pure Al.
A Programming Method of Vehicle Dispatch for Service Centre
Authors: Jia Hang Sheng , Cheng Fei
Published: October 2011

This paper combines Genetic Algorithm with Simulated Annealing Algorithm, namely GA-SA，to discuss vehicle paths and take into account the condition of time with respect to multi-spot service combination problem in service centre. The prevalent genetic algorithms easily lose the optimal solution, which affects the entire algorithm performance for reality vehicle assignment problem in the service centre. Based on modelling the vehicle assignment problem with natural description, fitness function, crossover operation and mutation operation are made the improvement in the approach. The process of computation has also considered own characteristics of the service centre to enable the algorithm optimized performance, in order to obtain the large scale enhancement.
Passive Energy-Saving Design in Hot and Humidity Area: A Case Study of Multi-Functional Stadium of Guangdong College of Pharmacy
Authors: Zhang Lei , Meng Qing Lin , Li Jin
Published: October 2011

As stadiums have high energy consumption in architectural lighting and air conditioning, how to make full use of natural lighting and natural ventilation is the key to architectural energy conservation. To this end, many passive energy conservation measures have been taken into account in designing Multifunctional Stadium of Guangdong Pharmaceutical University. For instance, strip light windows with vertical shading have been installed on east and west facade, open external windows on south and north facade etc. Test result of the Stadium shows that the above-mentioned passive design methods are able to increase natural light intensity of the playing field and prevent glare, improve wind velocity of natural ventilation and comfort in spectator areas.
Design and CMOS Implementation of a Low Power System-on-Chip Integrated Circuit
Authors: Gu Hao Lin , Shan Wei Wei , Yu Yun Fan , Lu Yin Chao
Published: October 2011

A low power 32-bit microcontroller using different kinds of low-power techniques to adapt to the dynamically changing performance demands and power consumption constraints of battery powered applications is designed and tested. Four power domains and six power modes are designed to fulfill low-power targets and meet different functional requirements. Varieties of low power methods such as dynamic voltage and frequency scaling (DVFS), multiple supply voltages (MSV), power gating (PG) and so on are applied. A novel zero steady-state current POR circuit which makes excellent performance in the chip’s OFF mode is also integrated. The SoC occupies 20 mm2 in a 0.18 um, 1.8 V nominal-supply, CMOS process. Test results show that the microcontroller works normally at the frequency of 70MHz and performs well in different power modes. Yet it only consumes 1.67μA leakage current in the OFF mode.
Design and Implementation of a Detection Device for Flight Control System in Unmanned Aerial Vehicle
Authors: Zhang Hong Jun , Jun Lu Wen , Tong Li Biao
Published: October 2011

Flight control system (FCS) is the command center for the unmanned aerial vehicle (UAV). A low-cost, high-precision micro-UAV attitude calibration table is designed by utilizing the structure of the vertical gyroscope of the flight attitude angle sensor. The detection device for the UAV FCS developed by loop-in-simulation achieves unmanned attitude calibration and overall performance detection of the FCS.
Design and Implementation of the Working Order for a PLC Controlled Terminal Cutting Machine
Authors: Feng Shu Min
Published: October 2011

Terminal cutting machine is an automatic device that can realize automatic feeding, bending, cutting the middle carry, shearing. It can be easily integrated with other automatic devices to form a whole production line. In this paper, the cam mechanism is used to realize bending and cutting the middle carry, hydraulic drive structure is used to realize terminal feeding and cutting. A reasonable working time sequence among various processes is necessary to ensure the right working order and avoid the interference. The point of the control is to know which processing step it is by using photoelectric sensors to detect several key positions of the cam. The detecting signal is received by the PLC and hence from there to control all processing steps executed in an ordered and cyclic matter. The timing sequence solution introduced in this paper has been successfully implemented in a terminal cutting machine.
Design of NCAP Based on IEEE1451 Standard
Authors: Chen Xiao Yan , Pang Tao
Published: October 2011

In consideration of the interchangeability and interoperability of the sensors from different manufacturers, this paper proposes a scheme which can replace the software with the hardware to realize the Network Capable Application Processor (NCAP) in the networked smart sensor node according to the IEEE 1451 standard. Since SST89E564RD is its Microcomputer Control Unit (MCU), the system selects the W3150A chip of hard protocol stack to solve the problem of TCP/IP and make network communication into reality. The drivers of TII, the network interface and the correction engine are designed to meet the demand of NCAP system. The experiments results show that the system is stable and has real time capability.
Effect of Catalytic Time Variation on Silica Antireﬂective Coatings
Authors: Jin Rui Min , Cai Zhi Duan , Cang Li Min , Yan Tao , Han Xiang Ju
Published: October 2011

Based on TEOS system and sol-gel process, together with catalysts, the microstructure of SiO2 particles in the sol is exactly controlled. The films are characterized by ellipsometer and SEM respectively. The experimental results show that adjusting catalytic time can effectively effect the uniformly porous structures of SiO2 thin film on the glass substrate.
Flow Predictable Optimal Scheduling Control of Sewage Discharge System
Authors: Chen Li Lin , Xia Ying Ying , Wang Xiong Hai
Published: October 2011

The current city sewage system which lacks of global scheduling discharge function easily causes high energy cost and sewage overflow problems. This paper introduces a new method based on the analysis of previous sub-time flow data, using the improved LS-SVM method to predict the volume of real-time inflow. The algorithm will adjust control objectives when inflow changes drastically so as to prevent sewage overflow and achieve energy efficiency. The simulation results show that under the control strategy we introduced, the system has good behaviors of determining and fast-tracking inflow changes. In addition, by implementing the flow scheduling discharge function, the pumping stations are dealing well with flow mutation and are able to maintain stable liquid levels so as to prevent overflow.
GPU Based Rendering of Natural Atmospheric Phenomena
Authors: Gong Zheng , Diago Luis , Hagiwara Ichiro
Published: October 2011

This paper explains and demonstrates a novel method of photorealistic simulation of two natural atmospheric phenomena, namely Emei Glory and Fog. Emei Glory is a natural phenomenon and can be observed in the area of famous Emei Mountain in China. The back-scattering effect of water droplet in fog causes this phenomenon. We use Mie scattering theory to simulate the glory and fog. Then calculate the spectral scatter intensity. For rendering, we adopt the method of single scattering integral to generate the whole scene by exploiting the parallel computation power of GPU. We demonstrate our synthetic results compared with the photographs at last.
Methods to Set Threshold Based on MATLAB
Authors: Wang Xu
Published: October 2011

In setting threshold to determine the arrival time in mechanical vibration signals which are collected by sensors and contain noise, five methods based on MATLAB have been proposed. Direct observation of the figure, powering operation to data, variance theory, reverse search and MATLAB programming has been used. Each method’s merits and demerits will be discussed so that it can be varied according to different situations. Consistent results have been achieved by those methods. MATLAB code has also been presented for better understanding of the algorithm and reproduction. After this analysis, a systematic way of setting threshold (determining the arrival time) has been formed and these methods could actually be used in all similar data separation.
Model Creation and Parameter Identification of Gun-Shoulder System
Authors: Bao Jian Dong , Wang Chang Ming
Published: October 2011

This paper analyzed mechanical admittance for contacting point between gun and shoulder; identified inherent characteristic parameters, established model of gun-shoulder system base on plentiful experiments. The results that can not only reflect mechanical impedance property of the shoulder, but also embody the equivalent dynamic response property of man-gun system. Then, making statistics analyses for different shooter, confirming receiving-shoulder’s model parameter of man-gun, providing academic base for building mechanics model of man-gun.
Design of Induction Motor Direct Torque Control System
Authors: Zheng You Gen , Chen Jian
Published: October 2011

According to the principle of the asynchronous motor direct torque control, based on the concept of space voltage vector, the paper correctly choices space vector, achieves a direct torque control algorithm. TMS320LF2407A chip as the core, conducted the system hardware design, software design, and conducted the actual commissioning of the system, obtained valuable results. In the system design and commissioning, at the same time the system simulation is carried out .The simulation promotes system design, in the actual commissioning, the simulation has played a guiding role.
A Predictive Dynamic Neural Network Model Based on Principal Component Analysis (PCA) and its Application
Authors: Yan Qi Yan , Liu Yong Qiu
Published: October 2011

We propose a real-time prediction method based on PCA and improved multi-step Elman net. The method not only preserves most original data information, but also eliminates the relativity among data and simplifies the net structure. It can predict the complex and nonlinear systems with dynamic recurrent algorithm. Through training the net has the ability of adapting to the uncertainty of the nonlinear structure, and then reflects the dynamic character of the systems. The hit rate reaches 88.17% to forecast the silicon content in hot metal of a blast furnace with errors ranging from-0.05 percent to 0.05 percent. The results prove that this method is feasible to predict silicon content on blast furnace and also it’s a prediction method of nice future.
Research on Influence Factors Based on Model of Rotational Ultrasonic Tube Testing
Authors: Zhou Hong Ming , Liu Guo Wen
Published: October 2011

The scanning mode of probes rotating at a high speed can make the ultrasonic testing for steel tubes much more efficient. However, the ultrasonic field produced by a fast rotating probe has a strong time variability, which influences the value of echo signals and leads to a decrease in accuracy of quantitative testing. In order to improve the reliability of quantitative testing, it is necessary to explore how ultrasonic waves travel in steel tubes and establish a mathematical model for the quantitative relation between echo signals and their influencing factors. A following numerical simulation experiment indicates that data from measurement and simulation are consistent with each other. Based on this ultrasonic model, the paper studies the relation between echo signals and relevant parameters in ultrasonic tube testing and claims that this model can optimize parameter configuration in steel tube testing.
Error Comparison and Analysis of Parallel and Constraint Mechanism for 3-TPS Hybrid Machine Tool
Authors: Dang Peng Fei , Fang Li Jin
Published: October 2011

This paper establishes position error model based on parallel robot kinematics theory, and analyses position error of the 3-TPS hybrid machine tool. Firstly, to calculate position error of the movable plate caused by the parallel mechanism links, through error model of the parallel mechanism which is established through inverse kinematics of the hybrid machine tool. Then, according to the error model of constraint mechanism established by transformation matrix method, the position error has been simulated and calculated. Finally, this paper compares the effects of both mechanisms. The analysis indicates the link error of constraint mechanism has more influence on movable plate posture than parallel mechanism, and provides help with motion error compensation and kinematic calibration.
Manufacturing Knowledge Modeling Based on Artificial Neural Network for Intelligent CAPP
Authors: Wang Jun , Zhang Hai Li , Su Zhang Yue
Published: October 2011

CAPP(computer aided process planning) is a key technology for integration of CAD and CAM. Process planning relies on manufacturing knowledge and CAPP is characterized with multi-knowledge resources, multi-task, multi-level and multi-constrain so process planning is hard to automate. This paper introduces the artificial neural network for unstructured manufacturing knowledge modeling, knowledge is represented as neural network weight value matrix, and then form ANN database to support intelligent CAPP. Example about cutting force modification is presented to test the feasibility of this approach. As Intelligent CAPP is knowledge based and structure of CAPP varies with types of knowledge representation, this paper presents the system structure of intelligent CAPP system. This system employs the black-board inference, unified manufacturing resource and part model, multi-knowledge database to realize the process planning automatically.
Trajectory Planning for Concrete Pump Truck Based on Intelligent Hill Climbing and Genetic Algorithm
Authors: Kang Xiao Dong , Huang Gang , Cao Xian Li , Zhou Xiang
Published: October 2011

This paper takes the five –link concrete pump boom as the research object, and transforms its trajectory planning issue into a multi-object optimization problem. Using intelligent hill climbing algorithm and genetic algorithm, and integrating them closely to ensure real-time online planning for the pump truck effectively, and make the planned motion trajectory for the boom is global optimized under particular constrained conditions. Simulation and performance comparison experiments show that this hybrid algorithm is practical and effective, which offers a new approach for the trajectory planning problem of concrete pump truck.
A Design Reuse Method for Parts Based on Structure Similarity
Authors: Xu Jing
Published: October 2011

By analyzing of similar features of symbol part structure, the definition and calculation method of similar degrees of symbol part structure are presented. On the basis of referring to the algorithms of retrieving compound in chemical database, a series of algorithms presented to retrieve similar part, the method is validated by example.
Electro Hydraulic Control Harmonic Aging Stress Elimination Devices - Modeling and Simulation of the Shock Excitation Part
Authors: Wang Hui , Li Meng
Published: October 2011

The main research is the dynamics characteristic of the shock excitation part of electro hydraulic control harmonic aging stress elimination devices. Use the system dynamics knowledge to set up a dynamics model of the shock excitation part. Analyze the transfer function of system and then use MATLAB to draw graphics under the condition of different parameters. Through the simulation graphic's analysis, we can obtain the influence of various parameters on system model, so as to provide a reference for the system optimization. MATLAB is abbreviation of Matrix Laboratory, which is used for algorithm development, data visualization, data analysis and numerical calculation of high-level technical computing language and interactive environment. It is useful for us in modeling and simulation.
The Stress Analysis and Safety Assessment of Pressure Vessels with Flaws in Power Plant
Authors: Wang Bin , Ma Chao , Wen Bing Quan
Published: October 2011

This research is based on the project investigation and repeated discussion. The British standard BS7910 was the basic theory, and accordingly carried out the experiment, the computation of the stress parameter and an expert system was developed. In this research, the test materials were gathered from project location, and uniaxial tension test, fracture toughness test are made. Then a material parameter database was established; in the research process, the FEA models of typical power plant pressure vessel were established and the stress parameters were gained through simulation method, and a classified stress database was established. The expert system is an effective assistance method for the safety assessment of the flaws, and it may help the ordinary engineers and technicians to grasp the complex assessment process.
Prediction of Networks Security Situation Based on Wavelet Kernel Function Network
Authors: Xiao Jian Qiong
Published: October 2011

Based on the foundation of prediction of networks security situation models, this article proposed a method about applying wavelet kernel function network to prediction of networks security situation. Wavelet kernel function network combined with the neural network and the support vector machines merits, which avoid support vector machine (SVM) solving binding second convex programming problem, network scale doesn't happen dimension disasters problem because kernel function is introduced, and its solution is the global optimal solution, so the situation prediction is more accurate. The experiment tests indicated that this method can accurately acquire the situation value prediction results, it has the good situation prediction potency, which provided one new key for prediction of networks security situation.
EBZ160 Star Wheel Boring Machine Loading Mechanism Optimization Analysis
Authors: Mao Jun , Chang Sheng , Xie Miao
Published: October 2011

In order to ensure the boring machine to work, star wheel loading mechanism must have good loading properties. The force of star wheel of EBZ160 loading mechanism is analyzed based on the creation of three-dimensional model of star wheel by using PRO/E software. Static analysis is done by importing the three-dimensional model of the star wheel in ansys. Checking the strength of the program star wheel. Based on the meet of the strength of the star wheel, topology optimization is done by using the OC method. The results obtained from topology optimization can be seen, basically meet the requirements of this program the amount of material is decreased by 20kg than before. The theoretical basis of improving star wheel design and improving performance is obtained.
Effects of Hot Band Annealing on the Precipitation of Copper Sulfide in Fe-3%Si Steel
Authors: Zhu Ye Chao , Mao Jiong Hui , Tan Fa Tang , Wang Ruo Ping , Qiao Xue Liang
Published: October 2011

Hot bands of Fe-3%Si steel containing 0.24%Cu were characterized to examine the precipitation of copper sulfides following different heat treatment schedules. It was found that copper sulfides were dominantly in a sphere shape. From 950°C to 1050°C, the precipitates were the complex of copper sulfides and aluminum nitrides. The size of the precipitates decreased and the distribution increased as the temperature increased. However, from 1050°C to 1150°C, the precipitates size increased and the distribution decreased with the rise of temperature. The precipitates were mainly complex copper-manganese sulfides. When the sample was annealed at 1050°C, air cooled to 900°C and boiling water quenched, the most fine and disperse precipitates were obtained. The average size and distribution of the precipitates was 37nm and 2.72μm-2, respectively.
Storage Test Techniques and Wireless Transmission Based on Embedded System
Authors: Wu Hong , Han Tao , Wang Can
Published: October 2011

Memory test technology is the most effective means to record the parameters of moving objects under special circumstances. This paper introduced the development of storage test systems based on ARM7LPC21XX. PHILIPS chip 16/32-bit microcontroller-LPC21XX was a 16/32-bit ARM7 TDMI-S CPU microcontroller based on a real-time emulation and embedded trace. It had two powers-saving modes-power down and idles, which could ensure the battery to work for a long time. The microcontroller internal 10-bit AD was used to sample data as well as SPI and NRF24L01 modules to realize communication.
Study on Load Characteristics of a Mini Permanent Magnet Synchronous Generator for Wind Power
Authors: Li Yong , Kim Il Soo , Park Soon Young , Shen Yun De
Published: October 2011

A mini permanent magnet synchronous generator (PMSG) for wind power with 24/8 poles was designed, and the mathematic model combining field equation and circuit equations was established. Based on the model, the transient process was analyzed by finite element simulation, and phase voltage, electromagnetic torque both on condition of no-load and load were investigated. Then the characteristics of load voltage, output power, and transfer efficiency under different loads were obtained, which could provide load matching reference for maximum power controllability of the various speed wind turbine. The investigation of the proposed PMSG shows that the rated load voltage is about to be 56 V, the rated power 450 W.
Study on Quantitative Detection of Pesticide Residue Based on Spectroscopy Technology of Differential Absorption
Authors: Zhao Ming Fu , Hu Jian Gan , Quan Xiao Li , Liu Jie Hui , Cao Xue Mei
Published: October 2011

For the domestic food safety problem that caused by the pesticide residues in food, it’s very important to find a convenient and cost-appropriate detection technology. At present, spectroscopy absorption technology has been used for detection of pesticide residues in food. However, there are some deficiencies such as the quantitative detection and the measurement precision. This experiment that based on differential absorption is completed by using miniature fiber optic spectrometer and spectrophotometer, and then the pesticide DDVP is also measured quantitatively. Thus the pesticide residue detection technology that based on spectroscopy absorption is improved to adjust to the practical application.
Study on Soft Sensor Modeling and Optimization Control of Biological Fluidized Bed Swage Disposal
Authors: Wang Xiao Yi , Liu Meng , Liu Zai Wen , Su Zhen , Lian Xiao Feng , An Xiao Dong
Published: October 2011

To solve the problem that outlet water index Biochemistry Oxygen Demand (BOD) of the Biological Fluidized Bed (BFB) sewage treatment process is difficult to online measure and optimization control of sewage treatment process, Water quality index neural network soft measurement method and the fuzzy control strategy was put forward in this paper. Considering the sewage treatment process exists nonlinear and time-varying characteristic, the effluent water BOD soft sensor model was established employing the process neural network. On the base of this, the optimization control was realized adopting Dissolved Oxygen (DO) for fuzzy control variable Through the soft measurement and fuzzy control model’s simulation training, Shows that the effectiveness and feasibility of these models, an effective soft measurement and optimization control way for BFB sewage treatment have been provided.
Target Fusion Algorithm for Remote Sensing Image Recognition
Authors: Zhang Yong Mei , Ma Li
Published: October 2011

Multisource image fusion technology is widely applied in a variety of fields such as remote sensing, computer vision, medical diagnosis and military surveillance. In most instances, multi-spectral and panchromatic images can provide more complementary information for feature extraction. Two kinds of images are used for target recognition. Algorithms based on gradient for image fusion only consider high-frequency information changes of the images, and neglect the richness of high-frequency information. To solve this problem, a new kind of self-adaptive rule and algorithm based on gradient and energy is proposed in this paper by analyzing the internal relations between the statistics and the content of the images. The rule and algorithm take into account the changes in high-frequency information and the richness of high-frequency information, and guarantees the richness of image information. Experiments show that the fusion rule and algorithm can significantly preserve all useful information from primitive images and effectively recognize targets with higher recognition accuracy.
Delay-Dependent Non-Fragile Robust Guaranteed Cost Control for Switched Systems with Multiple Time Delays
Authors: Zhang Ni , Fu Mei Chun , Zou Tao
Published: October 2011

The non-fragile guaranteed cost control is discussed for the polytopically uncertain switched discrete time systems with multi-delays in states and inputs. Based on the piecewise quadratic Lyapunov functions, the synthesis approach of the delay-dependent non-fragile guaranteed cost controllers is proposed. By the obtained control law, the perturbed switched discrete time systems can be asymptotically stabilized and the close loop cost is not greater than a specified upper limit for all admissible uncertainties. The numerical example is given to illustrate the validity of the presented controller design method.
Braking Distance Estimation by Simulation
Authors: Bartunek Marian , Moravčik Oliver , Schreiber Peter
Published: October 2011

The present-day computer power enables (parallel to tests) the simulation of processes of cars safety assurance by specialized software. This article describes a simulation of car braking and braking distance estimation in different conditions. The simulating model has been made in MATLAB/Simulink. The results of simulation give the braking distances, which are necessary for safety cars distance estimation for different road surfaces, cars speeds and other conditions.
Modal Sensitivity Analysis for Series Harmonic Resonance in Power System
Authors: Yang Cai Xia , Liu Kai Pei , Wang Dong Xu , Li Da Lu , Wang Kai Yu
Published: October 2011

Harmonic resonance is composed of series and parallel harmonic resonance. It is closely related to the singularity of a network loop impedance matrix or node admittance matrix. It was found that such resonance phenomenon is associated with the singularity of the network matrix. The smallest eigenvalue of the matrix defines the mode of series harmonic resonance. This paper applies this eigenvalue theory and modal sensitivity analysis method to determine which network components contribute significantly to a series harmonic resonance phenomenon. Case study results further confirm the theoretical correctness and effectiveness. Thus, this practical method not only provides significant measures for series harmonic resonance manage, but also support theoretical and experimental bases for the component parameter design.
Simulation and Research on Maximum Efficiency of Permanent Magnet Synchronous Motor Driving System
Authors: Cui Jie Fan , Li Lin , Yan Hong
Published: October 2011

The maximum efficiency of permanent magnet synchronous motor (PMSM) is studied and analyzed on the problem of the efficiency of motor driving system in the paper. Maximum efficiency and minimal loss have the same meaning, the mathematical model of the inverter and the PMSM are set up, thus the relationship between system loss and the stator flux is derived. Therefore, the value of the maximum efficiency of PMSM driving system can be achieved according to the expression of the stator flux. With the use of MATLAB/SIMULINK, the advantages of the loss model method and the search optimization method can be combined effectively to establish the driving system simulation model. While keeping the output-power constant by detecting the inverter-side DC voltage and current, the maximum efficiency and minimum loss in the overall range can be achieved rapidly.
The Dynamics Analysis of Full Mounted Converter Vessel Tilting Mechaism
Authors: Gu Ying Kui , Tong Xiang Xiang , Luo Xin Chong
Published: October 2011

In order to definite the dynamic properties of full mounted converter tilting mechaism and analysis the mechanical condition of the main transmission parts in the operation process, the dynamics behavior of the converter tilting mechaism was analysied. Vibration properties of the mechaism was analyzed by using mode shapes analysis method in no external force and an external force two circumstances, tilting mechanism can be constructed 11 degree of freedom force modal, and it can further simplify 3 degrees of freedom force modal. It can find resonant frequency of tilting mechaism through the analysis of the torsion vibration angular displacement and the torsion torque. It can provide scientific basis for equipment maintenance of technical personnels.
Design and Implementation of a Voltage Booster Circuit for High-Pressure Injector Drives in GDI Engines
Authors: Tsai Wen Chang
Published: October 2011

A DC/DC voltage booster circuit is essential to design for the high-pressure (H.P.) injector driving circuit since the power supply voltages for various H.P. injectors are DC 60~90 V rather than DC 12~14V battery voltages. The DC 12~14V battery voltages have to be boosted up to the stable DC 60~90 V voltages supply for being able to drive various H.P. injectors. The new H.P. injector driving circuit consists of a voltage booster circuit and an originally designed three-stage power MOSFETs injector driving circuit to control the dc-link power supply voltage. The dynamic performance of a H.P. injector driven by the designed electrical driving circuit with the voltage booster are simulated and analyzed. The stability and electrical characteristics for the voltage booster under various injection pulse durations and engine speeds are investigated. The fuel injection quantities, supply voltages and injector driving currents of the H.P. injector fed by the new injector driving circuit is illustrated and analyzed in the paper. The experimental results show that this injector driving circuit with a newly designed voltage booster is capable of operating stably to drive the H.P. injector and obtain the accurate fuel injection quantities in the air-fuel ratio control of engines.
Design and Realization of High-Speed and Real-Time Signal Processing System Based on FPGA
Authors: Wang Xin Chun , Peng Yue Hong , Cheng Man , Yue Kai Hua
Published: October 2011

We usually adopt DSP and ARM to perform signal collection and processing. However, functions of DSP and ARM largely depend on the software. Parameter modulation of the software must account for sampling time partly. Moreover, software can not control complex peripheral logic circuit very well. The above problems render DSP and ARM containing big flaws in high-speed data collection and processing. Field-programmable Gate Array (FPGA) possesses the characteristics of timeliness, controllability and rapid processing speed. The paper designed a new circuit based on FPGA to obtain high-speed signal, and utilized FFT IP core in FPGA to perform spectral analysis with the help of digital signals from the circuit. The paper introduced the design based on FPGA and verified that it possesses good performance according to actual experiments.
Design of Monitoring System for Frequency Converter Sets Based on PCI Bus
Authors: Yang Xin Yu , Cheng Pei Yuan , Li Xiao Quan
Published: October 2011

It is difficult to finish fully and professional testing about frequency converter sets when it was broken or repaired. Aimed at this problem, monitoring system for frequency converter sets is designed. Its hardware circuit is based on IPC platform and PCI bus and software platform is based on Visual Basic and VI (Virtual instrument) technology. It can finish controlling the work status and checking voltage, power etc. and temperature of key parts real-time about the set. Simultaneously it can give an alarm when the status is abnormal. Its results has characteristics of high reliability, high speed and intuitionistic. So it can improve efficiency of test system maximum and save repair expenditure. The system helps for improving reliability of gas turbo-generator set and power quality.
Design of the Transpire Freight Impact Test System Based on ASTM D6537
Authors: He Zi Fen , Zhan Zhao Lin , Zhang Yin Hui
Published: October 2011

In this paper, we develop a transpire freight impact test system based on ASTM D6537 standard. Test object is the transportation packaging of the laptop computer in the process of drop impact test. Data acquisition are handled using low-pass filter via Matlab software, which calculated four test indicators that consist of peak acceleration, the filtered acceleration, velocity change and pulse duration. We use several drop ways, which the drop height is 40cm and 70cm, respectively. Experiments show that the test object can protect the product safety when drop height is 70cm, but the box will be broken.
Error Analysis of Triangular Laser Measurement System
Authors: Yu Le Wen , Zhang Da
Published: October 2011

Analysis for error in triangular laser measuring system of three-dimensional profile. Analysis of the basic principle of laser triangulation method, and setting up the geometric optics model. Study on errors caused by image processing, expounding errors change caused by system structure parameters in detail, and given the methods to eliminating or reducing the errors with different factors.