bluuebunny/crossref_metadata_2025 huggingface dataset:
Intricacy of the Transit Manifold Concept Paid-off by Computational Accuracy
Authors: Rugescu Radu D. , Bogoi Alina , Cirligeanu Radu
Published: June 2013

Despite its intricacy the numerical method applied within the TRANSIT code proved successful in describing discontinuous, non-isentropic flows in rocket engines and solar-gravitational towers for green energy. A number of 0-D approaches are known to render some results in demonstrating the feasibility of the solar tower concept, or in unsteady simulation of transient phases in rocket engines. Computational efficiency is demonstrated by CFD simulation of the starting transients in ADDA solid rocket engines and in the SEATTLER solar mirror tower. The code is exclusively directed to unsteady flow simulations in slender channels. The wave front model scheme covers the dual behavior of fully non-isentropic flow with mass addition and mixing in the thrust chamber or blunt heat addition in a heater and fully isentropic through the exhaust nozzle or gravity draught in a tall tower. Along the tower of the solar-gravity draught power plants small perturbation discontinuous flows are covered. Code robustness is demonstrated during runs on the PC.
Design on Arc Plasma Temperature Online Detecting System
Authors: Hou Chun Guang , Zhang Shi Yu , Cao Yun Dong , Liu Shu Xin
Published: June 2013

Aiming at the arc plasma characteristics of high voltage circuit breaker, a set of multichannel, high speed, the synchronous detecting system is designed. The space distribution and time variation law of electric arc plasma, specially electric arc shape change law, are well reflected. Based on the ARM + CPLD + SDRAM detecting schemes, the system realized the functions of 64 groups optical fibers sampling, 4M/s sampling rate of every sampling channel, and the synchronous sampling. Through the detailed research and design to EMC, system error analysis, visual interface and database as well as the related interface program of ARM, CPLD, SDRAM and so on, has completed the multichannel, high speed and the real-time synchronized sampling, and mass data memory, computation, analysis, curve and animation demonstration and so on functions. The stability, feasibility and accuracy of the detecting system are proved by the practical application.
Fabric Defect Automated Detection Technology
Authors: Xu Guo Sheng
Published: June 2013

To solve the problem of automated defect detection for textile fabrics, this paper proposed a method for fabric defect detection which is based on computer vision. After the operations in many aspects of basis image processing, such as gray-scale, denoising, contour detection and morphological, and it can transmit the fabric defect image information to host-computer with the USB interface in time. In order to acquire high processing speed, the captured images from each camera are sent into one dedicate computer for distributed and parallel image processing. The experimental result confirms that the proposed method can is feasible in rapid defect detection, and has a broad market prospect.
Study on the Models of Relationship between the Rebound Effect and Energy Efficiency
Authors: Liu Ping Ping
Published: June 2013

t is generally recognized that technological progress will help individual energy product or service to improve energy efficiency. And to the whole of energy economic efficiency, the role of technological progress may not always promote the reduction of energy consumption. As rebound effect exists, it may further increase the demand for energy. With the continuous advancement of technology, increasing energy efficiency and rapid growth in energy consumption in our country, the need to further enhance the in-depth study on relationship between the rebound effect and energy efficiency. Currently, study abroad is more abundant in this area and our countrys study has lagged behind in this area. Therefore, the thesis, on the basis of international research, mainly from three aspects which are relationship between direct rebound effect and energy efficiency, indirect rebound effect and energy efficiency, the economy-wide rebound effect and energy efficiency, studies on the models of relationship between the rebound effect and energy efficiency in China. Through what we have mentioned above, we expect to offer useful references.
Nano-Scale Multi-Layered Coatings for Cutting Tools Generated Using Assisted Filtered Cathodic-Vacuum-Arc Deposition (AFCVAD)
Authors: Vereschaka A.A. , Vereschaka A.S. , Grigoriev S.N. , Sladkov D.V.
Published: June 2013

The subject of this study were nano-nanoscale multilayer coatings formed using the process of filtered cathodic vacuum arc deposition in assisting high-energy ions of chromium. We used a special emitter (implantor) to generate chromium ions with high energy. Such key parameters of coatings as composition, structure, a thickness, hardness, adhesion in relation to a substrate obtained at various energy of chrome ions have been studied. It is establish the positive change of key properties of coating deposited on carbide inserts WC/CrC/Co, WC / (Co-Re), TiC/TaC/Co at assisted impact of ions Cr at ion acceleration voltage within the range of 10-40 kV. The results of measurement of parameters of coatings with use nanoindentometer are consistent with the X-ray analysis of the stresses in the coating (XSA study). The mechanisms of the effect of modified properties of coatings formed in assisting the filtered cathodic vacuum arc deposition on the properties of the carbide inserts in cutting structural steels and hard-to-cut nickel alloys have confirmed the high efficiency of the deposition process developed coatings and coating compositions.
Cost-Efficient Composite Processing Techniques for Aerospace Applications – A Review
Authors: Ganjeh Babak , Hassan Mohd Roshdi
Published: June 2013

Composite materials have been used in aircraft components since the early beginning of aircraft industry establishment.Undenaible advantages of composites in mechanical properties and light weight in comparison with conventional metal alloys make them desirable alternative for fabrication of different aircraft components. However, quality concerns and high costs of processing tackle the extensive usage of composites in aircraft structure, until the past decade, introducing new generation of composite processing techniques, needless of traditional autoclave processing and capable of fabricating aerospace-grade quality composite parts more time and cost efficiently. In this paper concise review over recent cost-efficient composite processing technologies with proven practicality in commercial aircraft applications, is presented.
Contributions Regarding the Practicality of a Quantum Pair Space Thruster
Authors: Drăgan Valeriu
Published: June 2013

Traditionally a space propulsion unit has a propellant mass which is ejected trough a nozzle at highvelocity to generate thrust. This paper proposes the use of the quantum pair formation for generating a working mass, this is different than conventional anti-matter thrusters since the material particles generated are used as a propellant mass not as energy storage. Two thrusters will be compared: photonic and quantum pair generation. The latter will be shown to offer better momentum than photons above certain energy levels. The implication is that quantum pair thrusters may develop into a new class of space propulsion systems.
Keywords: quantum pair formation, space propulsion, photonic propulsion
Industrial Water Requirement Forecast Model and Application Based on PCA-BP Neutral Network
Authors: Xiao Han , Hu Jin Ling , Wang Guo Li , Wang Ben De
Published: June 2013

ndustrial water requirement is usually influenced by multiple factors, among which have close relations, which can cause distortion of some forecasting results, and weaken the suitability of some formulas. To this end, we adopt BP neural network model, use principal component analysis (PCA) to analyze the relationships between variables of the model to solve the related issues between the various factors, in order to set up forecast model of industrial water requirement and take Zhengzhou City as an example to analyze. The results showed that this method could take the influenced factors of industrial water requirement into consideration comprehensively, offer higher and more accurate forecasts, and provide the reference framework for integrated planning of regional water resources and long-term water supply planning.
Modeling and Numerical Investigations for Launching a Free-Flight Models Using Light-Gas Propulsion Technology
Authors: Lu Xin , Zhou Yan Huang , Yu Yong Gang
Published: June 2013

In this paper, using light-gas propulsion technology, a one-dimensional mathematical model is established and simulated numerically for working process of light-gas launching facility with a piston-compressor type. A 30mm/120mm light-gas launcher is taken for the primary computing model, and lots of data, such as the pressure on pump, the piston velocity, the diaphragm failure pressure, etc. are obtained by computing the model in given geometry parameters and loading conditions. According to the numerical results, it is concluded that the developed mathematical model can provide theoretical references for structure dimension design and loading parameter configuration of light-gas launcher.
Improved Harmony Search Algorithm for Solving Optimization Problem with Mixed Discrete Variables
Authors: Hao Shi Ming , Cheng Li Zhi
Published: June 2013

The classical harmony search algorithm (HSA) can only be used to solve the unconstrained optimization problems with continuous decision variables. Therefore, the classical HSA is not suitable for solving an engineering optimization problem with mixed discrete variables. In order to improve the classical HSA, an engineering method for dealing with mixed discrete decision variables is introduced and an exact non-differentiable penalty function is used to transform the constrained optimization design model into an unconstrained mathematical model. Based on above improvements, a program of improved HSA is designed and it can be used for solving the constrained optimization design problems with continuous variables, integer variables and non-equidistant discrete variables. Finally, an optimization design example of single-stage cylindrical-gear reducer with mixed-discrete variables is given. The example shows that the designed program runs steadily and the proposed method is effective in engineering design.
A Hash Algorithm Construction Based on Generalized Chaotic Maps
Authors: Fang Xuan , Qiong Cai , Fang Lan
Published: June 2013

Due to the single chaotic map on finite precisions chaotic characteristics emerge degradation,the length of cycle become shorter, the Hash algorithm constructed by it is easily forecast, the security is not strong.In this paper, the nonlinear devices in the traditional block cipher S-box is used to construct variable parameters Hash algorithm composed of multiple chaotic maps. By using the original message, intermediate values of iteration and number of iterations as the input of the S-box, output of S-box is used to determine the parameters of chaotic maps, on this account to change the chaotic mapping function for each round. By execute text testing, statistical analysis and collision analysis for this algorithm through simulation experiments, the experimental results show that this generalized chaotic Hash algorithm has good sensitivity of the information, low possibility of collision,good safety and operational efficiency.
An Improved Adaptive Unsharp Masking Image Enhancement Algorithm
Authors: Zhu Li , Zhu Chun Qiang
Published: June 2013

When needing a reliable adaptive image contrast enhancement in real-time processing such as digital TV postprocessing,This goal is achieved by an improved adaptive unsharp masking image enhancement algorithm in the paper. The proposed improved adaptive unsharp masking filter controls the contribution of the sharpening path by the output of Laplacian and works in such a way that contrast enhancement occurs in high detail areas and little or no image sharpening occurs in smooth areas. The experiment shows that this improved algorithm greatly reduce the complexity of computing and can be reliably used.
A Novel Self-Embedding Watermarking Scheme for Image Tamper Detection and Recovery
Authors: Zhang Jun Peng , Zhang Qing Fan , Xie Xiu Ying
Published: June 2013

In this paper, an effective self-embedding fragile watermarking scheme is proposed. The watermark is generated by encoding the DCT coefficients of each 2×2 block and embedded into another block. A non-linear pseudo random sequence is used for generating the block mapping which can enhance the security of the algorithm. An improved tamper localization and recovery algorithm are performed. The experiment results show that the tamper region can be successfully localized and exactly recovered, even if under the content-only tampering.
Fast 3-D Feature Point Detector Based on Harris
Authors: Lv Jing Guo , Kong Wei Zhe , Li Dong Yue
Published: June 2013

Image matching is a key a key technology to be solved in the fields of digital photogrammetry and computer vision. Matching based on points matching is most widely used now. How to locate the right feature points is vital. Only accurate feature points can make right matching results. The paper introduces a method of 3-D Harris detector. The two steps matching have been done in our works. The results of experiments show that the 3-D Harris detector is accuracy and efficient.
Research on the High-Speed Object Shadowgraph Image Processing Method Based on Adaptive Threshold Segmentation
Authors: Wang Fang , Yang Zong Wei , Kong De Ren , Jia Yun Fei
Published: June 2013

Shadowgraph is an important method to obtain the flight characteristics of high-speed object, such as attitude and speed etc. To get the contour information of objects and coordinates of feature points from shadowgraph are the precondition of characteristics analysis. Current digital shadowgraph system composed of CCD camera and pulsed laser source is widely used, but still lack of the corresponding method in image processing. Therefore, the selection of an effective processing method in order to ensure high effectiveness and accuracy of image data interpretation is an urgent need to be solved. According to the features of shadowgraph, a processing method to realize the contour extraction of high-speed object by adaptive threshold segmentation is proposed based on median filtering in this paper, and verified with the OpenCV in VC environment, the identification process of the feature points are recognized. The result indicates that by using this method, contours of high-speed objects can be detected nicely, to combine relevant algorithm, the pixel coordinates of feature points such as the center of mass can be recognized accurately.
Wavelet Denoising of SAR Images Corrupted by Speckle Noise Using Cycle Spinning
Authors: Ji Ming Wei , Liu Yan Li , Zhang De Xiang
Published: June 2013

A novel and efficient speckle noise reduction algorithm based on wavelet transform by cycle spinning for removing speckle of unknown variance and minimizing the effect of pseudo-Gibbs phenomena from Synthetic Aperture Radar (SAR) images is proposed. Therefore, we show that the sub-band decompositions of logarithmically transformed SAR images. Then, we process and reconstruct multi-resolution wavelet coefficients by wavelet-threshold using cycle spinning, a technique estimating the true images as the linear average of individual estimates derived from wavelet thresholded translated versions of the noise images. Experimental results show that the proposed de-noising algorithm is possible to achieve an excellent balance between suppresses speckle effectively and weaken as many image Gibbs phenomena as possible. Quantitative and qualitative comparisons of the results obtained by the new method with the results achieved from the other speckle noise reduction techniques demonstrate its higher performance for speckle reduction in SAR images.
An Image Matching Algorithm Based on SUSAN-SIFT Algorithm
Authors: Zhang Hui Qing , Cao Lu Guang
Published: June 2013

For the purpose of improving the real-time performance of the SIFT algorithm, an image matching algorithm based on SUSAN-SIFT algorithm is proposed in this paper. Use SUSAN algorithm in the detecting feature points part of the SIFT algorithm, avoiding the time-consuming down-sampling and Gaussian convolution of the algorithm, and remove the feature points of the
unstable and low-contrast by the methods of interpolated estimate and the principal curvatures, and then use the SIFT algorithm to achieve the parts of describing the feature points and images matching. experimental verification: the SUSAN-SIFT algorithm has more fast calculation speed than SIFT algorithm ensuring the accuracy at the same time.
A Selective Naïve Bayesian Classification Algorithm Based on Rough Set
Authors: Hu Yin E , Luo Ke
Published: June 2013

Naive Bayesian classifier (NBC) is a simple and effective classification model, but its condition independence assumption is often violated in reality and makes it perform poorly. In our study, we attempt to improve the NBC model through the way of attribute selection based on rough set. The main idea of the improvement model is to select a closest approximate independent attributes subset and relax the assumption of independence. Through the experimental comparison and analysis on the UCI datasets, the model is proved effective.
JPEG2000-Based Optimization Algorithm for Effective Compression Display of Remote Sensing Images
Authors: Lu Liang , Zhang Leng , Zhang Ting
Published: June 2013

Taking the compression issue of remote sensing images as the study subject, this paper analyses the technical process for JPEG2000 compression and the image features of remote sensing images, natural images and figural images, and puts forwards an integrative optimization algorithm for effective compression display for remote sensing images based on common JPEG2000 compression frame. Thereinto, it includes high-frequency component filtering treatment, parallel processing of bit plane coding pass scanning and improved ROI coding algorithm, which give obvious clews to both overall consumed time for image compression and the gradual display effect in ROI region.
Fast Precise Positioning of Circular Mark in Automatic Optical Inspection
Authors: Xiong Guang Jie , Liu Yu Fei , Liu Rui Zhen
Published: June 2013

Captured circular marks are deformed sometimes when Automatic Optical Inspection (AOI) is used to detect various defects on Printed Circuit Boards (PCB), which may affect the precision of inspection. A new accurate positioning method of circular marks is proposed to solve the problem by obtaining the center of the most round ellipse based on the criterion that the ratio of the difference between the length and width of its circumscribed rectangle and the width of the rectangle is less than 0.1. The simulation tests show that, if the mark has much more deformations, the center positioning error of the proposed algorithm is about 0.013 pixels, and the running time is less than 40ms. Therefore, the proposed method provides good characteristics such as speediness, strong anti-interference ability and robustness.
Intelligent System of Brain Tumor Automation Diagnosis Based on Image Analysis and Mining
Authors: Wu Peng , Ruan Ning Jun , Xie Kai
Published: June 2013

This paper covers brain tumor diagnosis system based on image analysis and mining and its application. The system use the algorithm of fuzzy region competition, extracts shape feature factors to classify tumor shape, maps shape classification extracted automatically and other medical image features to numbers and then feed to bayesian network to sort the brain tumor automatically.
A Improved Infrared and Visible Images Matching Based on SURF
Authors: Li Dong Mei , Zhang Jing Lei
Published: June 2013

Images matching is the basis of image registration. For their difference, a improved SURF(speeded up robust features) algorithm was proposed for the infrared and visible images matching. Firstly, edges were extracted from the images to improve the similarity of infrared and visible images. Then SURF algorithm was used to detect interest points, and the dimension of the point descriptor was 64. Finally, found the matching points by Euclidean distance. Experimental results show that some invalid data points were eliminated.
Improved Blind Equalization Algorithm and Simulation
Authors: Cai Wei Ju
Published: June 2013

This paper focuses on the constant modulus Busgang blind equalization algorithm (CMA blind equalization algorithm in Constant, The Modulus Algorithm). Analysis of the convergence performance of the traditional CMA blind equalization algorithm, the fixed step size, convergence speed and convergence of mutual constraint between the precision of its application under great restrictions is demonstrated in the paper. In order to solve this contradiction, this paper presents a CMA blind equalization algorithm based on the mean square error (MSE Mean Square Error).
A Fast Handoff Emulation Platform Base on V2V
Authors: Zhou Lian Bing
Published: June 2013

We design a V2V-based fast handoff scheme using IP address passing for VANETs in this thesis. The proposed scheme allows a leaving vehicle in the exit area to pass an IP address which has been identified by the Duplicate Address Detection (DAD) procedure to the vehicles in the entry area directly. In addition, the leaving vehicle in the exit area can also pass an IP address to the vehicles in the middle area if there is no vehicles in the entry area. Therefore, our scheme can reduce the use of DHCP to obtain an IP address. Because DAD results in the largest delay of the whole DHCP procedure, our scheme can thus improve the utilization of IP address, reduce the time of acquiring an IP address, and reduce the whole handoff time.
Design and Analysis of CAN User Layer Communication Protocol
Authors: Dai Ai Ni
Published: June 2013

A new protocol for CAN user layer communication based on CAN2.0B which is named Qucan_A is presented, at the same time, combined with the feature of control network, the design ideas and protocol structure have been provided, and the examples of how to use it are also given. (Abstract)Keywords-Field bus; Control network; CAN; User layer communication protocol (keywords)
Implementation of the DES Algorithm on EDA Box
Authors: Li Xue Mei , Li Li
Published: June 2013

The EDA (Electronic Design Automation) technique which provides us an alternative method of circuit system based on the PC and information technology is a novel technique in modern electronic engineering field. Research on implementation of the DES (data encryption standard) has been paid much attention. In this paper, a description of the DES implementation on EDA box is presented in an alternative method which is suitable for EDA experimental teaching. The DES is set to different parts according to EDA experimental content. We introduce in detail the sub-circuits which consist of the circuits of the DES from simple units to large scale parts, which is easy for students or beginners to learn hardware implementation of cipher algorithm.
Nonlinear Aeroelastic Behavior of Slender Wings Considering a Static Stall Model Based on Wagner Function
Authors: Badiei D. , Sadr M.H. , Shams Sh.
Published: June 2013

The aeroelastic behavior of high aspect ratio wings in an incompressible flow is investigated. The nonlinear nonplanar bending-bending-twisting motions of beam theory is used for the structural equations assuming large deformations with small strains, small Poisson effects, inextensional beam theory, and linear elastic material characteristics by neglecting warping and shear deformation. An Unsteady nonlinear aerodynamic static stall model based on the Wagner function is introduced and then is used for determination of aerodynamic loading of the wing. In this aerodynamic model, the static lift curve vs. angle of attack is approximated by a piece-wise curve and for each linear part of this curve a corrected Wagner theory is used. Combining these two types of formulation yields fully nonlinear integro-differentials aeroelastic equations of motion. The governing equations will be solved to predict the nonlinear aeroelastic response of a wing in the stall and post stall regions using Galerkin's method and a numerical method without the need of adding any aerodynamic state-space variables and their corresponding equations. The obtained equations are solved for some test cases and the obtained results are compared with the results given in the literature. Also a study is done to show effects of nonlinear aerodynamic static stall model on the limit cycle oscillations.
Application and Study of BP Neural Network and Genetic Algorithm for Optimizational Parameters Based on MATLAB
Authors: Zhu Yu Hua , Zhuang Dian Zheng
Published: June 2013

BP neural network modeling is introduced using MATLAB neural network toolbox function, In order to find the non-linear mathematical model between data. And process parameters is optimized combination the neural network and genetic algorithm, The method has been applied to optimize parameters for nitric acid device, and proved to be highly importance, Programming with MATLAB is very brief and practicable to optimize parameters using neural network and genetic algorithm.
Research of Prewarning Pipe-Sticking Based on Neural Network
Authors: Zhu Dan , Liu Guang Xing , Zhang Qi Zhi
Published: June 2013

According to the process of drilling characteristics which include complexity and uncertainty, this paper will propose using the technology of neural network in order to making stuck drill accident prewarning, setting the model of sticking prewarning, finally shows that the accuracy of the models by field data. Choosing mean impact value (MIV) algorithm for the variables influence screening, then selecting variables which influences on the accident of stuck drill largely as the input of the network, collecting the data of drilling and building the sticking prewarning model, eventually the the accuracy of the models is proved.
An Efficient P2P Overlay Network Model Based on Clustering
Authors: Li Qiang , Chen Liang Bin , Chen Yu Ke
Published: June 2013

The P2P system was build with the topological structure of the network at the application layer, network topological structure for an P2P system has a very important significance. There is currently a wide range of different topology structure of P2P network, HCPON uses two-level clustering structure, based on HCPON, we propose an efficient overlay network model based on clustering (PONM), it solves the problem that the super node only uses a single backup node as a redundant backup leading system robustness improvement is limited in unstructured P2P system. The model through a directory server to manage all nodes on the network, The results of the simulation demonstrates that,compared with HCPON, PONM has a relatively stable path stretching rate and lower average link pressure, can meet the requirements of Large-Scale P2P streaming media service needs.
A MATLAB-Based Study on the Realization and Approximation Performance of RBF Neural Networks
Authors: Ding Shuo , Chang Xiao Heng
Published: June 2013

BP neural network is a kind of widely used feed-forward network. However its innate shortcomings are gradually giving rise to the study of other networks. Currently one of the research focuses in the area of feed-forward networks is radial basis function neural network. To test the radial basis function neural network for nonlinear function approximation capability, this paper first introduces the theories of RBF networks, as well as the structure, function approximation and learning algorithm of radial basis function neural network. Then a simulation test is carried out to compare BPNN and RBFNN. The simulation results indicate that RBFNN is simpler in structure, faster in speed and better in approximation performance. That is to say RBFNN is superior to BPNN in many aspects. But when solving the same problem, the structure of radial basis networks is more complicated than that of BP neural networks.
Keywords: Radial basis function; Neural network; Function approximation; Simulation; MATLAB
A New Method for Translating NFA into DFA
Authors: Cheng Yuan Bin
Published: June 2013

It is important in theory and practice to translate a NFA into DFA. So far, subset construction is the most popular method. The method, however, needs import a dummy input ε and ε-closure and has a complicated computing procedure. In this paper, a new method to translate a NFA into DFA straightly is described. The new method needn’t import a dummy input ε and ε-closure, it accords to the original NFA state graph or state shift table to translate a NFA into DFA straightly.
Implementation of CRC by Using FPGA in Data Communication
Authors: Wang Lie , Wang Yi Jie
Published: June 2013

By introducing the basic principle of ordinary CRC algorithm, the paper develops an algorithm which can be used to analyze data communication structure and construct design process. At the same time, it can be quickly implemented in the data communication process. The algorithm uses Verilog HDL hardware description language to complete all the design on ISE development platform. And it uses Xilinxs development board Virtex-II Pro to achieve the final realization. Compared with traditional methods, the algorithm is simple and intuitive, which reduces computational the delays and saves space. It also benefits hardware implementation.
Diagnosis and Predictive Maintenance of Machinery and Equipment, by Measuring Vibration
Authors: Niculescu Dan Florin , Ghionea Adrian , Olaru Adrian
Published: June 2013

The paper presents results of analysis of the dynamic behavior of rotating mechanisms and couplings of the main structure of a kinematic chain sharpening machine precision Cugir normal UAS 200. The ultimate goal is to establish diagnostic and maintenance program the car UAS 200.
Diagnosis by measurement of vibration and noise, allow a company to monitor faults and machines and equipment, through a system of preventive maintenance, predictive. Diagnosis automatic machinery and equipment is made in order to ensure a higher reliability of these and how to obtain a more extended life cycle without the occurrence of defects.
The application of preventive and predictive maintenance management supports enterprise, because it proves effective, the information you provide in making decisions.
Optimal Design of LCD Module under Random Vibration
Authors: Wang Hai , Zhou Xuan , Xia Xiao Pin
Published: June 2013

Random vibration is being specified for acceptance tests, screening tests and qualification tests by manufacturers of electronic equipment meant for military applications, because it has been shown that random vibration more closely represents the true environment in which the electronic equipment must operate. In this paper, the simulation of the LCD panel subjected to random vibration load is done by the rectangle plate to represent the panel, the deformation and stress of LCD is analyzed by FEM method. Combined the simulation result and Taguchi optimization algorithm, we analyzed the relationship between the geometric dimensions of LCD and the dynamic response.
Motion Simulation of a Boat Shaped Grass Burying Rotary Tilling Blade Roller by Pro/E
Authors: Li Zhao Dong , Zhang Guo Zhong , Yong Zhou , Lu Yuan Shuang , Zhai Jian Bo , Yi Li
Published: June 2013

his paper adopted Pro/E5.0 to do parametric structure design and virtual assembly for the whole boat shaped grass burying rotary tilling machine. The structure and function of grass burying rotary tilling blade roller was elaborated in the paper. This paper mainly did simulation analysis about the motion track of grass burying rotary tilling blade roller. The results showed that the forward speed of the machine had significant influence on the motion track of blade roller while at the certain rotational speed and gyration radius.
Simulation Research on Shielding Effect of the Computer Box against Strong Electromagnetic Pulses
Authors: Cao Bing , Liu Cheng Long
Published: June 2013

In this paper, the finite element method is utilized to research the coupling effects between the strong electromagnetic pulse and the computer box with holes. Focus on the influence law of the box size on shielding effectiveness of computer box against strong electromagnetic pulses. The relationship between the simulation resonance frequency and the theoretical results is obtained; the influence of the holes shape and size on shielding effect is also obtained. It is concluded that the computer boxs shielding effect is poor under the resonance frequency, and there is no linear relationship between shielding effect and holes size when the frequency is determinated. The shielding effect doesnt become worse with the holes size increasing.
Determination of Onset of Yield due to Material Properties in a Heat Generating Two-Layered Compound Cylinder
Authors: Ozturk Ali , Gulgec Mufit
Published: June 2013

In this theoretical study, based on Trescas yield criterion and its associated flow rule, the elastic deformation of a centrally heated compound cylinder with fixed ends is investigated analytically by taking into consideration not only the geometrical but also the material parameters such as yield strength, modulus of elasticity, Poissons ratio, thermal conductivity and coefficient of thermal expansion. These material parameters are assumed to be independent of the temperature. The compound cylinder is assumed to be very long such that axisymmetric condition exists. Both of the constituent materials of the two layers are supposed to be elastic-perfectly plastic materials. There is heat generation in the interior solid cylinder but no heat generation in the outer hollow cylinder. Both of the cylinders are assumed to be bounded perfectly at the interface. Elastic stress analysis is performed to prevent yield in the compound cylinder.
Keywords: Compound cylinder, elastic stress analysis, thermal stress, yield strength.
On Dynamics Analysis of a Novel Three-Dimensional Autonomous Chaotic System
Authors: Jia Wei Hong
Published: June 2013

This paper reports a novel three-dimensional autonomous chaotic system. By choosing an appropriate bifurcation parameter, we prove that a Hopf bifurcation occurs in this system when the bifurcation parameter exceeds a critical value, and some basic dynamical properties, such as Lyapunov exponents, fractal dimension, bifurcation diagram, continuous spectrum and chaotic dynamical behaviors of the new chaotic system are studied. Furthermore, the forming mechanism of its compound structure obtained by merging together two simple attractors after performing one mirror operation has been investigated by detailed numerical as well as theoretical analysis.
Research on the Optimization of Engine Operation Condition Based on Intelligent Automobile
Authors: Sheng Fa Sheng , Shi Xiang Rong
Published: June 2013

In order to realize efficiency optimization of automobile engine, the multi-sensor data fusion methods based on multi-valued logic is proposed, according to the relevance requirement of automotive engine parameters and the control features of the multi-value T-operator, the multi-value T-network control system is designed, taking human driving experience into consideration. By real-time information collection of the sensors and simulation experiments, the related data is gained, which shows that the system circuit operates normally and the information collected is accurate and reliable. Not only engine efficiency control but also energy saving and emission reduction could be realized. Furthermore safety decision making aid function is provided to improve automotive engine efficiency.
Running Time Optimization Study Based on Genetic Algorithm of Coke Oven Mechanical
Authors: Pang Ke Wang
Published: June 2013

This article aim at coking mechanical running time is optimization Researched based on the genetic algorithm, first presented running time model of the S type accelerate and deceleration curve and corresponding running constraint condition, and then established time optimal model of the genetic algorithm and simulation function of the running time use genetic algorithm to optimize, and finally through the operation simulation function, the optimal results is given.
Reversing Gear Failure Analysis of Mini-Car Variator Base on ANSYS Software
Authors: Zhang Xiao Fan , Luo Wen Xin
Published: June 2013

This paper attempts to give a detailed model and contact emulation analysis of gear models based on the ANSYS software, the method of which is superior to stree analysis figuring out the causes of mechanical failure. stress nephogram of the emulation analysis indicates the fracture of gear base is mainly caused by inclined press load which results in stress concentrate. This paper offers very valuable reference to product optimization and gear improvement.
Kinematics and Dynamics Simulation of a New Type Direct-Drive NC Turret Tool Post
Authors: Dai Yuan Xing , Zhang Tian Rui , Zhang Xue Wei , Yu Tian Biao
Published: June 2013

Building 3D model for a new type direct-drive NC Turret tool post, and introduce the model into ADAMS for further kinematics and dynamics simulation. In the kinematics simulation, observing the motion process of the direct-drive NC turret tool post and plots the trajectory of moving parts to a curve. Simulate the force condition of the NC turret tool post in actual situation, calculate the axial load and verify the clamping force in dynamics simulation.
Optimizing the Drilling Process of Multi-Layer Materials Using Vibration Analysis
Authors: Vintilescu Alina , Jallageas Jeremy , K'Nevez Jean Yves , Chérif Mehdi
Published: June 2013

Composite in aircraft structures has become increasingly important and should represent approximately 50% in mass till 2012. During the structure assembly, in aerospace centres of production there are used pneumatic positive feed units (also called automatic drilling units). They are manually positioned on specific grids to drill the panels of structure (assemblies of composite materials, aluminium and titanium). This article compares vibration-assisted drilling and non-vibratory drilling and presents the advantages of using vibrations in the process. The conclusions will show the results obtained and the developments to be carried out in an immediate future.
Keywords: multi-layer material, vibration assisted drilling, Campbell diagram.
CAD Designing for Stamped Tooth Wheels
Authors: Dinev George , Yancheva Marieta , Stancheva Vasilka
Published: June 2013

The article presents the results from the researches related to the designing and documentation of tooth wheels for stamping within a CAD medium. In order to increase the quality and the competiveness of the products, there have been offered methods related to the process of constructing. There have been developed 3D geometrical models as die forgings of tooth wheels obtained by volumetric, thermal stamping. These models are to be used for the preparation of working drawings of the die forgings. The results are useful for the purpose of establishment of creative constructive solutions and optimal production expenses which would meet the requirements of the market.
Tools for Automated Design of Intermittent Mechanisms with Radial Parallel Cams
Authors: Dostrašil Pavel , Jirásko Petr
Published: June 2013

The paper deals with the kinematics and automated calculation of intermittent mechanisms with radial cams. Currently, electronic cams are increasingly applied in the drives of working link mechanisms. Despite a huge advantage of electronic cams in their re-programmability or instantaneous change of displacement diagrams, conventional cam mechanisms have an irreplaceable role in production and handling machines. With high frequency of working cycle periods, the dynamic load of the proper servomotor rotor increases and efficiency of electronic cams strongly decreases. Though conventional intermittent mechanisms with radial cams are representatives of fixed automation, they have distinct advantages in their high speed (high dynamics), positional accuracy and relatively easy manufacture. We try to remove the disadvantage of firm displacement diagram by reducing costs for simple design and automated calculation that leads reliably to high-quality and inexpensive manufacture.
Aerodynamics Performances of Tunnel Jet Fan and its Passage Components Design
Authors: Pan Di Lin , Chen Kai
Published: June 2013

Jet fans are widely used in ventilation systems of road tunnels, railway tunnels and subways etc. It was demonstrated that the static pressure generated by jet fan impeller is merely useful for overcoming its own internal flow resistance and can not improve the ventilation state of tunnel. It was pointed out that in the aerodynamic design process, the static pressure of jet fan should be made as small as possible. The effective way to reduce static pressure produced by impeller is the rational design of jet fan passage components.
The Research on Creep Deformation and Thermal Stress of Cast Copper Staves
Authors: Shi Lin , Cao Fu Jun
Published: June 2013

The creep deformation of the cast copper cooling staves was researched based on the steady temperature field by using thermal - mechanical coupling finite element transient analysis method and ABAQUS software. The results show that the creep deformation only under the effect of thermal stress is slight and negligible compared to the deformation generated by thermal expansion. The total tress is not adequate to crack the stave body. Therefore, the cast copper stave can meet the requirements of blast furnace longevity.
Optimizing the Process of Steel Slab Reheating in Pusher Type Reheat Furnace Prior to Hot Working
Authors: Abuluwefa H.T.
Published: June 2013

Steel reheating prior to hot rolling is a process which is necessary to achieve sound mechanical and chemical properties of the finished steel products. Heating of steel works in reheat furnaces takes place gradually and with specific rates in order to avoid the development of structural defects due to the development thermal stresses. A mathematical two dimensional heat transfer model was constructed in order to calculate steel slab heating profile through the reheat furnace with actual temperature set points of the furnace zones being used as an input to this model. Calculated slab temperatures indicated aggressive heating of the steel in the early stages of heating and that slabs remain at temperatures close to rolling temperatures for longer period of time than necessary. This finding necessitates a readjustment of slab heating strategy in order to protect furnace components and steel from overheating.
Analysis of Solar Energy-Water Source Heat Pump Hot Water System's Optimization Strategy
Authors: Lv Jian , Ma Xiao Hong , Zhen Shu Ai , Zhang Ying
Published: June 2013

Through testing the operation of solar energy-water source heat pump hot water system, analysis of the factors that affect system performance, research engineering optimization strategies for improving systems performance. Given some optimization recommendations for both solar energy system and water source heat pump system. Provide some supports for this new technology which use renewable energy in the future development.
Convective Condensation of Oxy-Coal Combustion Flue Gas of Laminar Fow in a Vertical Pipe
Authors: Dong Jing Lan , Yan Wei Ping , Zhang Chao Hui
Published: June 2013

The problem of the oxy-fuel combustion flue gas condensation is the condensation of vapor in the presence of high concentration non-condensable gas. The vapor condensing at dew point temperature releases heat and diffuses on to the surface of the pipe through a non-condensable gas film. Thus it is treated as combined heat and mass transfer problem governed by mass, momentum and energy balance equations for the vaporgas mixture and diffusion equation for the vapor species. The flow of the falling condensate film is governed by the momentum and energy balance equations. The temperature at the gas-to-liquid interface, at which the condensation takes place, is estimated with the help of the heat balance and mass balance equations at the interface. The local values of the condensation Nusselt number, condensate Reynolds number, gasliquid interface temperature and pressure drop are estimated from the numerical results for different values of the system parameters at inlet, such as vapor component, temperature of vaporgas mixture, gas phase Reynolds number and total pressure. The thermodynamic calculations were made and analyzed using numerical calculation method under different conditions.
Strong Lines Emitted from Positive Column of Narrow Bore T2 Low-Pressure Ar-Hg Discharges
Authors: Han Qiu Yi , Zhang Shan Duan
Published: June 2013

The electric field and absolute radiance of 13 strong lines in the positive column of narrow bore T2 (outer diameter 7 mm) low-pressure Ar-Hg discharges were measured experimentally, which includes 11 Hg lines ranging from 185 to 579 nm and 2 Ar lines of 811, 842 nm. The discharges were operated with different argon filling pressure ranging from 2 to 10 Torr (corresponding to 266 to 1333 Pa), for discharge currents 20-200 mA and cold spot temperature 20-80 °C (0.16-11.8 Pa Hg vapour pressure). The Koedam factors of important emission lines were also measured for various discharge parameters, in order to convert radiance to exitance, whereafter the radiant power of all the lines except 185 nm, could be calculated and their radiant efficiency could be compared as well. Considering the absorption of 185 nm radiation in air, the ratio of the radiance at 185 nm to that at 254 nm was measured instead of its Koedam factor for current 80-200 mA and cold spot temperature 20-60 °C. Therefore, 185 nm radiant power was derived indirectly from that of 254 nm in corresponding discharge conditions.
According to our measured results, the argon pressure for the maximum production of 254 nm radiation is around 5 Torr. It is showed that the optimum cold spot temperature for 254 nm radiant efficiency is higher than 50 °C, which is consistent with the temperature dependence on the tube diameter. With increasing discharge current and cold spot temperature, 185 nm radiant power has the similar tendency to that of 254 nm, while the fraction of electrical power converted to 185 nm radiation increases slightly with these parameters. Generally, the ratio of radiant power at 185 nm to that at 254 nm is higher than 0.2. For evaluating the energy balance of the positive column as well as the luminous efficacy of the fluorescent lamp product, the radiant powers of other strong lines also has significantly effect though they are considerably smaller than that of 254 nm and 185 nm. Besides, it must be taken in consideration that mercury depletion on the axis of positive column is serious for T2 narrow tube discharge especially at low Hg vapour pressure and high current.
Research on the Dimming Characteristics of Short Arc Ultra-High Pressure Mercury Lamps for Projection Applications
Authors: Shi Shui Jun , Han Qiu Yi , Zhang Shan Duan
Published: June 2013

The voltage, current and power are measured for short arc ultra-high pressure mercury lamps (UHP) with rating power 250 W driven by 50 Hz square waveform power supply. It is found that the curve slope of voltage-current characteristics is positive in most of the power range, and negative around 170 W. The photometric, colorimetric and electric parameters are measured with an integrating sphere system couple with a spectrometer in UHP dimming experiments. The results show luminous flux increases with power linearly. The luminous efficacy and color rendering index (CRI) reduce with power reduction because of the decrease of spectral continuum. The mercury pressure are calculated with the full width at the half maximum (FWHM) of 546 nm spectral band, which is 6.2-11.0 nm according to the mercury pressure 15.3-25.8 MPa for UHP power 43-258 W.