bluuebunny/crossref_metadata_2025 huggingface dataset:
Nonlinear Dynamic Response and Safety Analysis of Suspended Submarine Pipeline
Authors: Shao Bing , Yan Xiang Zhen , Yang Xiu Juan
Published: October 2011

With the application of ANSYS finite element analysis software and environmental data in ChengDao oil field, a nonlinear finite element model of suspended submarine pipeline coupled with sea-floor soil is developed. Discarding the traditional and imprecise pipeline model with double clamped or simply supported ends, the model is founded on the theory of elastic foundation beam, in which the nonlinear effect between pipeline and sea-floor soil is considered. Base on the model we developed, the influences of span length and shear strength of soil at the ends of span on the span’s natural frequency are discussed. And the effects of span length, shear strength of soil and current velocity on the dynamic response of span are also analyzed in this paper. The model we developed in this paper fits the actual structure better, and the analysis is instructive for preventing and controlling the suspending of submarine pipeline.
Reliability-Based Sensitivity Design of Gear Pairs with Non-Gaussian Random Parameters
Authors: Yang Zhou , Zhang Yi Min , Zhang Xu Fang , Huang Xian Zhen
Published: October 2011

Based on reliability design theory, by using the Edgeworth series method, and the sensitivity analysis method, the reliability sensitivity of the cylindrical gear pairs with non-Gaussian random parameters are extensively discussed and a numerical method for reliability sensitivity design is presented. The variation regularities of reliability sensitivity are obtained and the effects of design parameters on reliability of the cylindrical gear pairs are studied. The presented method provides the theoretic basis for reliability design of cylindrical gear pairs.
Research on Steel Tube Confined Concrete Supports Support Technology for Soft Rock Roadway in Coal Bed Washout
Authors: Li Xue Bin , Ma Zheng Xing , Liu Guo Lei , Chen Ming Cheng , Zhu Quan Mei
Published: October 2011

East auxiliary roadway of Pingshuo Mine No.3 passed through coal bed washout with the roof rock crushing, which leaded to roadway support difficulty. by experimental tests on axially loaded Φ168mm STCC (steel tube confined concrete ) short columns with different steel tube wall thickness, UBC(ultimate bearing capacity) of selected Φ168 × 7 mm steel tube confined concrete short columns was 2650 kN, support pressure was 1.16 MPa., then support scheme of Φ168 × 7 mm steel tube confined concrete supports was proposed. The result of FLAC3D simulation was that the maximum displacement of surrounding rock was 55.6mm. On-site support practice also showed that the support scheme guaranteed the stability of the roadway sounding rock
Review and Prospect of the Research of Vibration and Friction Mechanism of Machine Joint Surfaces
Authors: Li Xiao Peng , Nie Hui Fan , Zhao Zhi Jie , Song Gui Qiu
Published: October 2011

The machine joint surfaces are necessary to form the functions of the complex mechanical system. Because the macro or micro relative motions may appear in the machine joint surfaces, the vibration and friction phenomena will be excited, then the singularities, disturbances and faults of the mechanical system may be appeared when the machine equipments in the running process. These undesired phenomena will have adverse effect on the efficiency, precision, reliability and lifetime of the mechanical equipment. In order to ensure the functions and properties of the mechanical system, more attentions should be paid to mechanism of vibration and friction during the process of designing and manufacturing the modern machine. In this paper, machine joint surfaces are classified by different classification standards: the macro relative motions and micro contact styles between the joint surfaces. The theories and methods for researching vibration and friction mechanism are inducted and summarized and the view of non-linear should be advocated for the future research. The point of precisely quantifying for machine assembly accuracy design while considered the relevancies between the macro and micro-scale of mechanical system indicates that new directions and methods for studying vibration and friction mechanism in machine joint surfaces should be put forward.
Study of Transient Elastohydrodynamic Lubrication of Spur Gears under Impact Load
Authors: Wang You Qiang , He Zhi Cheng , Su Wei
Published: October 2011

Spur gear contacts experience a number of time-varying contact parameters including the load, surface velocities, radii of curvature, and slide-to-roll ratio. It is very hard to obtain transient elastohydrodynamic lubrication (EHL) solution of spur gears. In this study, a transient EHL model of involute spur gear tooth contacts is proposed. A full transient EHL solution of involute spur gear under impact load is obtained by utilizing the multigrid technique. The influences of impact load on the EHL of spur gear are analyzed in the paper. The numerical results show that the approach impact load has strong transient influence on the oil film thickness and pressure distribution between contact zones. The impact load may lead to instantaneous lubrication film deterioration between contact teeth of involute spur gears.
Study on Torque Control Strategy of Dual Clutch Transmission during Shifting
Authors: Deng Tao , Hu Fen Bin , Sun Dong Ye
Published: October 2011

Based on the analysis of Dual clutch transmission (DCT) working principle, the shift kinetics model is established, and the power switching rule between two clutches during upshift and downshift is established by analyzing the torque transmission relationship of vehicle driveline system during shifting, then shift process is tested on actual vehicle with Matlab/Simulink software. Comparing the two different kinds of downshift processes, and illuminating the effect on engine control by various downshift control rules, the downshift process is optimized.
Research on Tribological Property of Micro-Arc Oxidation Film on AZ91D Magnesium Alloy
Authors: Lou Bai Yang , Zhao Jie , Zheng Zhi Heng , Liu Ping
Published: October 2011

Magnesium alloys were treated by micro-arc oxidation at a constant applied current density. The friction and wear properties were investigated by optical microscope and universal friction and wear tester in 3.5%NaCl solution. The result reveals that the film formed by micro-arc oxidation enhances the corrosion resistance of the magnesium alloys. The Ecorr of micro-arc oxidation film improved 94mV than the Ecorr of magnesium alloys matrix. Wear resistance of the film was weakened in 3.5%NaCl solution. The wear mechanism of film depends on the load. Abrasive wear was predominant at low load. Peeling wear was predominant at high load, which result from damage of the film adhesion.
Solute Redistribution Resulting in Growth of Primary Silicon in Cast Hypoeutectic Al-Si Alloys
Authors: Wang Shou Ren , Wang Ying Zi , Yang Li Ying , Ma Ru , Wang Yong
Published: October 2011

The experimental data present that primary silicon is precipitated from eutectic and hypoeutectic Al–Si alloy melts. It attributes to solute redistribution on the chemical driving force. Si atoms are easy to segregate to form Si-Si clusters, resulting in primary silicon precipitated from hypereutectic Al–Si alloy. Another reason is that primary silicon is precipitated from solid-liquid interface front once solute concentration in the solidification front exceeds eutectic composition. Solute redistribution equations are derivate from Jackson-Chalmers equation. The third reason is that precious little impurity turn Heterogeneous Nucleation of Si atoms.
Corrosion Resistance of TiN Coating on 304 Steel
Authors: Her Shiuh Chuan , Wu Cheng Lin
Published: October 2011

Titanium Nitride (TiN) coatings with high surface hardness, good wear and corrosion resistance, low friction coefficient have been widely used in many applications such as a hard coating of cutting tool, a diffusion barrier layer. In this work, TiN thin films were deposited by D.C. magnetron sputtering process on SUS 304 steel substrate. Magnetron sputtering provides a wide variation of the deposition parameters which affect the morphology of the films and, consequently, their properties. The effects of substrate temperature on the microstructure and corrosion resistance of TiN films were studied in details using atomic force microscopy and potentiostat test. Considerable improvements in the surface roughness and corrosion resistance were observed when the substrate temperature was increased from C to C.
An Improved LS-SVR Ensemble Learning in Internet Traffic Prediction
Authors: Li Kun Lun , Ma Ying Hui , Tian Yong Mei , Xie Jing
Published: October 2011

In this paper, we present a new method for internet traffic forecasting based on a boosting LS-SVR algorithm. AdaBoost has been proved to be an effective method for improving the performance of weak learning algorithms and widely applied to classification problems. Inspired by it, we use LS-SVR to complete the initial training; and pay more attention on the “high error areas” in the time series; then, we use an ensemble learning algorithm to learn these areas.
Application of BP Neural Network in the Reliability Prediction
Authors: Jiang Wei , Zhang Meng , Chen Zhi Ling , Liu Yun , Li Ning
Published: October 2011

Using neural network BP algorithm and the neural network toolbox of MATLAB, this paper presented a new reliability prediction model of the products. Its processes included that confirming training samples, putting up the network that was initialized, training the network and predicting reliability parameters of the products. At last reliability parameters of an example were predicted with the reliability prediction, the prediction effect was more perfect.
Studies of Synchronous Rotor Gear Monitoring Technique Based on Ant Colony Neural Network
Authors: Chen Yi Jun , Zhao Qing Hai
Published: October 2011

In this paper, the nonlinear mapping relationship between characteristic parameters of failures and failure types is realized by using neural network through extracting characteristic variables of failures during operation of the gear. Aiming at the problems of neutral network such as slow convergence speed and existence of local minima, the neural network is optimized and the ant colony neural network is established by using the ant colony algorithm to realize rapid and accurate determination of failure status of a gear from characteristic parameters of failures. In addition, validity of the established model is verified through experiments.
Edge Detection Based on Wavelet Transform and Fusion
Authors: Tian Tao , Zheng Zhong , Wang Hong Xia , Luo Mei
Published: October 2011

To pick-up information from the image, the pretreatment towards the image is necessary. Based on the contrast from the traditional edge detection, the theory of wavelet transform is introduced and studied. Then the image is smoothed through wavelet transforming. Meanwhile, the edge information of the image is intensified using the transforming. This paper proposes a new mage fusion method based on wavelet transform. Across the computer simulation, it’s educed that the result of edge detection based on wavelet transform is much better than the traditional edge detection.
Image Encryption Based on Digital Watermarking Technology
Authors: Zhang Shuang , Qin Yu Ping , Wang Xiao Juan
Published: October 2011

According to the LSB algorithm is simple to achieve the characteristics of image scrambling technology combines good features in Arnold. Use change for the shadow image. LSB algorithm by the shadow image is embedded into the cover image, then LSB algorithm using images extracted from the image's shadow. The extracted text in the shadow image is designed to recover the original Arnold inverse transform. This method not only effectively hide the image without damage, as also to ensure the security of the hidden images, without injury.
Improving Transmission Availability for Wireless Cognitive Networks: SkyChannel Query Processing
Authors: Liu Li Xia , Hu Gang , Huang Zhen , Peng Yu Xing
Published: October 2011

In wireless cognitive radio networks (CRNs), user will send the sensing data to neighbors for spectrum allocation. Actually only part of data will affect the allocation result. The transmission of unused sensing data isn’t cost-efficient because it consumes a great deal of computing and network resource, especially for CRNs in which the spectrum and power resource is very precious. We propose an improving transmission availability algorithm— SkyChannel Query, which can find the non dominated channels and only transmit information of these channels. The experimental results show the advantages of our algorithm in terms of saving computing resource and improving transmission availability.
Intuitionistic Fuzzy Sets with Double Parameters and its Application to Automatic Control System
Authors: Zhang Zhen Hua , Yang Jing Yu , Ye You Pei , Wang Min
Published: October 2011

The notion of intuitionistic fuzzy sets with parameters (IFSP) is first introduced in this paper. Compared with conventional intuitionistic fuzzy sets (IFS), IFSP can improve the recognition accuracy when it is applied to pattern recognition. By analyzing the degree of hesitancy, this paper concentrates on the construction and application of intuitionistic fuzzy sets with double parameters (IFSDP). Finally, a pattern recognition example applied to automatic control system is given to demonstrate the application of IFSDP. The simulation results show that the method of IFSDP is more comprehensive and flexible than that of the traditional intuitionistic fuzzy sets.
Master-Slave Parallel Genetic Algorithm Based on MapReduce Using Cloud Computing
Authors: Li Guang Ming , Zeng Wen Hua , Zhao Jian Feng , Liu Min
Published: October 2011

The implementation platforms of parallel genetic algorithms (PGAs) include high performance computer, cluster and Grid. Contrast with the traditional platform, a Master-slave PGA based on MapReduce (MMRPGA) of cloud computing platform was proposed. Cloud computing is a new computer platform, suites for larger-scale computing and is low cost. At first, describes the design of MMRPGA, in which the whole evolution is controlled by Master and the fitness computing is assigned to Slaves; then deduces the theoretical speed-up of MMRPGA; at last, implements MMRPGA on Hadoop and compares the speed-up with traditional genetic algorithm, the experiment result shows MMRPGA can achieve slightly lower linear speed-up with Mapper’s number.
Monitor & Diagnosis Support System for Nuclear Power Plants
Authors: Cheng Shou Yu , Liu Xin Kai , Peng Min Jun
Published: October 2011

An Monitor& Diagnosis Support System for Nuclear Power Plants (NPPMDS) is developed in the embedded real-time operation system VxWorks in this paper. NPPMCS includes data collection and validation unit, operation monitoring unit, fault diagnosis unit, alarm analysis unit, operation procedures and Human-machine interface and so on. The paper introduces the design and implementation of NPPMDS including the structure of the NPPMDS and the main function units. In order to confirm the validity of this system, the SGTR simulation experiment was carried out on a full scale simulator of nuclear power plants. The experimental results show that the system provides operation support, the load and pressure for the workers can be reduced and the safety of nuclear power plants can be enhanced.
Study of Material’s Creep Relaxation Capability
Authors: Chen Hong Jiang , Wu Yue Hai
Published: October 2011

Creep relaxation is an important form of system failure, how to understand and analyze the effect of creep relaxation, to solve system failures and improve economic efficiency are of great significance. The paper describe researches of creep relaxation , mathematical models and theories at home and abroad in detail, and introduce the finite element method applied in this field. By comparing with the mathematical models, finite element Methods with test results, improving current mathematical models and utilizing finite element method is an important trend.
Research on Linear Array CCD Laser Vertical Displacement Measurement
Authors: Li Fu Bao , Li Zhong Ke , Li Qin
Published: October 2011

The purpose of this study is the use of linear array CCD laser sensors to measure the vertical displacement. In this paper, the laser vertical displacement measurement principle of line array CCD has been discussed, using the vector method to calculate the spherical optical ray tracing, and linear CCD laser collimator lens and camera lens are designed.
Research on Government Investment in Public Project Performance Evaluation Model under Low-Carbon Economy
Authors: Hu Fang , Li Lin , Liu Zhi Hua
Published: October 2011

Researches on the method of the performance evaluation of government investment in public project are mainly embodied in indicator system. However, these models do not attach importance to the applicability. So, it causes lack of suitable evaluation model for evaluating the projects of government investment in public project in Low-Carbon Economy. Therefore, this article in accordance with the characteristics of this investment in public projects, combined the gray relational analysis method, fuzzy comprehensive evaluation method and stepwise discriminate analysis method with their respective advantages to develop a new algorithm——GFS algorithm. Using the GFS algorithm can do discriminate analysis for a new investment project. Practice shows that the GFS algorithm has a good effect. It can provide the theoretical basis for decision-making of senior government managers.
Study on Optimization Proportioning Experiment and its Hydration Mechanism of Composite Cementing Material
Authors: Liu Jin Xiao , Yin Zeng De , Sun Wen Bin
Published: October 2011

This article aims at the accelerating characteristic of coal filling material. We scientifically made a series of proportion on composite-cementing material through uniform design with Portland cement, sulpho-aluminate cement and gypsums. After having testing the capability of this, we found that some certain composite-cementing material strength has been improved, both early and later strength. Furthermore, we also continually analyzed the hydration products and microstructure of composite-cementing material, then determined that early hydration products were mostly ettringites and later were C-S-H-centered and CH-centered gel.
The Analysis of Photovoltaic Cell’s Mathematical Model and Applied Research of MPPT Control Methods in PV Power Generation System
Authors: Jia Gui Xi , Zhang Chun Yan
Published: October 2011

In this paper, two kinds of photovoltaic cell’s mathematical model are presented, and their curves of output characteristic are drawn. The MATLAB/SIMULINK model of PV power generation system is based on PV cell's physical equivalent circuit, its mathematical model 2 and PV module YL 120 P-17b/1470×680. Due to the single peak of the output U-P characteristic, PV module has a Maximum Power Point (MPP). The fixed-step and variable-step duty ratio perturbation methods are applied to the model of PV power generation system that has been established for MPPT simulation research in this paper. In addition, the advantage of variable-step duty ratio perturbation method and the important role of the storage battery have been proved by the simulation results.
Research on Torque Production of a New Magnetic Gear
Authors: Man Yong Kui , Xu Chang Cheng , Wang Shuang Quan
Published: October 2011

Gear is essential in modern powertrain. While the overwhelming majority of existing gear's power transmission is relying on direct contact of the engagement mechanically, this paper is the study of a novel non-contact magnetic gear. The new structure is especially useful for the requirement of big gear ratio because of its high load ability. Such gear, with high research value, has many advantages over mechanical gears and may replace mechanical gears in many applications. Torque is so basic at factors such as mechanical work, energy consumption, efficiency, operating life and safety. For the basic mechanical components to transmit motion and power----- gears, the torque measurement and analysis seems of great significance in determination and control of load, working parts' intensity design and material selection. Torque analysis is a method which researchers could benefit from much, in order to clarify the practicality of this new gear, it is necessary to utilize theory of torque and the conclusions drawn from simulation to research the structure of this new gear situation. The study can clarify prospect of the gear and provide a theoretical basis for further design.
Image Acquisition of Drivers' Fatigue State Based on Fuzzy Evaluation
Authors: Chen Xue Mei , Wei Zhong Hua , Gao Li
Published: October 2011

The research on monitoring and predicting drivers’ fatigue state has remarkable effect on prevention of traffic accidents, using the CCD image sensor camera as the image acquisition device of driver’s face and the 940nm infrared emitting diode as the light supplementary device and 3-points light supplementary had been utilized, the light supplementary system had been optimized by the experiment of infrared light supplementary which proceeded by means of combining the orthogonal experiment and expert fuzzy evaluation. The research result makes great sense to the monitoring of drivers’ fatigue state and traffic safety
A Revised Benign Worm-Anti-Worm Propagation Model
Authors: Fang Yong Hui , Zheng Xu Fei , Xie Tang Tang
Published: October 2011

Due to the proactive defend against the worm propagation and patch the susceptible hosts, benign worms are attracting wide attentions in the worm research. In this paper, we put forward a revised benign worm-anti-worm propagation model to achieve effective containment of worms.
Analysis and Research of AHP-Based Method Base
Authors: Li Li , Li Xiao Guang , Qin Chang Hai , Zhang Xiu Tai
Published: October 2011

This paper introduces that the representation and storage of hierarchical model via a database table, achieves the dynamic generation and management of model. It main achieves model base based on AHP. That addresses a number of unstructured or semi-structured problems such as assessment and prediction in the modeling. Focusing on the creation of their corresponding AHP-based method base is to solve practical problems. Experiments show that this method base can be well integrated with model base. So it will be applied in common AHP cases.
Analysis on Calculating Numerical Integration Methods of Common Social Science Field
Authors: Hou Jun , Liu Kui , Li Qian Mu
Published: October 2011

Some methods on calculating a nonlinear Common Social Science Field Numerical Integration are proposed in this paper. It mainly concentrated on the comparison among the composite trapezoidal method, the trapezoidal method, the simpsons' method and the romberg’s method on integrating efficiency. It expressed the different application scales of these methods through strict numerical analysis with C programming results.
Application of Visualized Design Method on the Designing of Articulatory Vibrating Screen
Authors: Jiang Jing , Liu Guang Chao , Li Chao Feng , Wang Lei , Liu Shu Ying , Wen Bang Chun
Published: October 2011

Articulatory vibrating screen is composed of multi-section screen with articulatory vibrating. The principle of even-thickness screening is referenced on its layout, with linear vibrating screen as the discharge end, with round vibrating screens as the feeding end, and also the intermediate screen. In accordance with the structural features of articulatory vibrating screen and under the condition of assembly module in Pro/E, mechanical components of articulatory vibrating screen are assembled in the light of the arrangement, the sequence, the restrictions and the modifications of installation. With the visualized research on the operational process, the three-dimensional illustrations of assembly model are established to ensure the correct design on every mechanical component of articulatory vibrating screen. The finite element model of vibrating screen is set up by its analysis software to carry out the analysis of finite element calculation and modal according to two operating modes of the regular work and the machine halt beyond resonance region. The analysis result indicates that the intensity and the rigidity of the vibrating screen are safe; the machine operation is stable; and no resonance phenomenon would happen. This study provides the theoretical reference for the design of similar machinery. It is of practical importance and economic value to apply the visualized design method into the design of articulatory vibrating screen.
Study on Separation and Purification of the Transglutaminase
Authors: Shi Yan Guo , Qian Lei , Zhang Na , Han Chun Ran , Liu Ying , Zhang Yi Fang , Ma Yong Qiang
Published: October 2011

The transglutaminase was purified through alcohol precipitation, ammonium sulphate precipitation, ultrafiltration, gel layer chromatography, and the purified alkaline was demonstrated to be electrophoretic by SDS-PAGE. Using the activity of alkaline protease as indicators. the purification of transglutaminase was optimized.The results indicated that the enzyme activity of purified transglutaminase was 107.86 U•mg-1, final purification factor was 10.42, Activity recovery factor was 27.3%,The enzyme properties of transglutaminase were also studied, The optimal conditions of transglutaminase were as follows:pH6.0, 40°C.After incubation at 40°C for 2h,the residual activity of the enzyme was ablve 90%,and the enzyme was relatively stable at pH5~7.
Edge Detection Based on a Fuzzy Inference System
Authors: Sun Shu Liang , Liu Cheng Lian , Chen Si Sheng
Published: October 2011

First-order linear ﬁlter is a wide application algorithm to detect edge in digital image. However it dosen’t make good effort to the image where contrast varies much, or luminance takes on non-uniform. In this paper, a fuzzy inference system (FIS) is made up and used to detect edges. The experiment shows that FIS is much better in edge detection when the image with high contrast variation than with the linear Sobel operator. The FIS is also more precise in edge detection than Sobel operator.
Numerical Simulation Analysis in Cooling Temperature Field and Bending Deformation after Rolling of 100-Meter Rail
Authors: Liu Yu Yan , Wang Yan , Chen Lin , Li Ge , Wang Jian Guo
Published: October 2011

The paper established U75V 100-meter rail 3-D transient non-liner finite element analysis model about U75V 100-meter rail by using the large-scale non-liner finite element analysis software ABAQUS. By analyzing the different positions in the section of the temperature variation, the changes of bending degree and the residual stress variation after the bending deformation have changed. Based on the 100-meter straight rail in natural cooling under the cooling process, simulation results showed that in the cooling process, deflection change with time mainly divided into four stages; In consideration of the friction effect, the flat rail cold curve for its deformation among roughly flat, the curve about either ends, the scope for bending is 18 meters, the maximal displacement is 1.88 meters while the flat rail occured end colding.
Path Transfer Probability for Vibration Transfer Path Systems with Translational and Rotational Motions in Time Range
Authors: Zhao Wei , Zhang Yi Min
Published: October 2011

A new way, which is used to analysis the path contribution, is presented for the vibration transfer path systems considering the interact of vibration source, transfer path and receiver. It is that the path contribution is evaluated using the path transfer probability. According to the dynamic characteristics of vibration systems, the new concept of path transfer probability is given. Based on the generalized probabilistic perturbation method and the reliability theory, the computational approach for path transfer probability with uncertain physics and geometry factors in time range are presented. The transfer probability of vibration transfer path systems with translational and rotational motions is analyzed and calculated via a numerical example, which shows that the proposed method is feasible.
Research of Electricity Customer Classifications Based on Kernel Clustering Algorithm under the Organic Combined Model
Authors: Yang Shu Xia , Ding Hui
Published: October 2011

The principle of kernel methods combined with data description were analyzed and the organic combined model of particle swarm algorithm(PSO) and genetic algorithm(GA) was put forward firstly, then the kernel clustering algorithm under the organic combined model of the GA and the PSO was put forward. Finally, according to the customers’ data of certain electric power company, this kernel clustering algorithm was applied to classify the electricity customers into three groups: the first group includes 3 customers, 5 and 7 customers for the second group and the third group respectively. The result shows that the samples can be classified and the center of mass can be obtained using the data description based on kernel methods. But the clustering region is different when the of kernel method gets the different value. This makes the clustering process to be complex, also spends the longer time. While kernel method’s clustering algorithm organically combined with the PSO and GA can get the same result in the shorter time and the calculation is simpler
Research on Method of Items Recognition Based on SURF Algorithm
Authors: Chen Wen Yu , Xie Wen Zhi , Zhao Yan Li , Hao Zhong Bo
Published: October 2011

Items detection and recognition have become one of hotspots in the field of computer vision research. Based on image features method has the advantage of low amount of information, fast running speed, high precision, and SIFT algorithm is one of them. But traditional SIFI algorithm have large amount of calculation data and spend long time to compute in terms of items recognition. Therefore, this paper come up with a method of items recognition based on SURF. This article elaborates the basic principle of SURF algorithm that firstly use SURF algorithm to extract feature points of item image, secondly adopt Euclidean distance method to find corresponding interest points of image, and finally get the image after items recognition combination with mapping relation of item image using RANSAC(Random Sample Consesus). Experimental results show that the system of item recognition based on SURF algorithm have better effect on matching recognition, higher instantaneity, better robustness.
Research on the SIFT Algorithm in Image Matching
Authors: Cong Yuan , Chen Xiao Rong , Li Yi Ting
Published: October 2011

SIFT feature matching algorithm is hot in the field of the currently feature matching research, its matching with the strong ability can deal with the translation, rotation, affine transformation occurring between images , and it also have a stable image feature matching ability to the images filmed at any angle. SIFT algorithm is adopted in this paper, matching feature point through the scale space , calculating the histogram of detecting feature point neighborhood of gradient direction characteristic vector and generation to SIFT eigenvector and the key points similarity measure. From different setting threshold, scale scaling, rotating, noise on the experiment, the experiment result proves this algorithm in the above aspects has good robustness, suitable for mass characteristic database of rapid, accurate matching.
Scene Modeling of Virtual Operation Training System for Tower Cranes
Authors: Dong Ming Xiao , Li Rui Chuan , Xu Qin Zu , Zhu Cui Lan
Published: October 2011

The functions and structure of a virtual operation training system for tower cranes was described, and virtual scene modeling techniques of the system was investigated in this paper. The virtual scene model of building site and environment around a tower crane were set up based on Creator softward. Model optimization techniques were used to reduce the number of model surfaces and model nodes, which saved system resources and improved system running speed. Model driver was realized in VC++ by calling Vega functions, which achieved the performance of real-time interaction between trainers and the scene. The techniques provide the foundation for developing the virtual real software of virtual operating system for training operators.
Study on Establishment of Helix Flute Mathematic Model of Solid Carbide End Mills
Authors: Li Guo Chao , Sun Jie , He Yong
Published: October 2011

This paper describes a new approach to establish the helix flute model of solid carbide end mills. Based on the theory of differential geometry and coordinate transformation, a mathematical model of the end mill helix flute will be established.The main idea of the study is to envelop the helix flute by a one-parameter surface group which consists of the cross-sectional profiles of the wheel.Then, the mathematical model will be quickly verified by MATLAB.Thus the end mill design time will be saved and the new mathematical model will be checked effectively.
The Discussion on Systematic Design of Modern Ceramic Products
Authors: Wang Min
Published: October 2011

The traditional ways of ceramic product design depended on intuitive design and empirical design. It often looked upon the design objective in the view of one-sided and isolated thinking, which hasn’t already met the requirements of social development with modern in formalization and diversification. Establish the system view of modern ceramic products, and solve the problems in the way of systematic design ideas and solutions during designing modern ceramic products, analyze and recognize the various factors in design of modern ceramic products comprehensively. It is instructive and meaningful for the modern ceramic products to take the correct way. It emphasizes the design factors of modern ceramic products and the integrity, comprehensiveness and optimization of the relationship, and also integrates the rationality and the systematic methods with the emotion and intuitive thinking organically.
Taiwan Defense Education Curriculum Teacher's Essential Ability and the Teachers Cultivate Research of the System
Authors: Huang Min Chuan , Wu Chao Yen , Tzeng Jang Ruey
Published: October 2011

Taiwan defense education teacher cultivates research of the system conception. Taiwan's Senior middle school or in university's school the military training and the national defense pass know the curriculum teacher are hold the post by the active duty officer, Master unit for Republic of China Ministry of Education. Recent years the domestic education environment tended to the serviceman to withdraw from the school edition curriculum, did not have the academic license serviceman status teacher, always shouldered the people to accuse it to not to have the card interferes the education according to the teacher and the serviceman, often directed the person question is the military officer is also teacher's this crowd of associations otherwise has the teacher specialized ability. The question lies in this group of military officer teacher not to have the further education to obtain the qualified teacher card, and before the present education system also does not have the defense education curriculum teacher duty, to train with the university which awards cultivates the unit. This research discussion's key is defense education teacher's essential ability and the teachers cultivates the system the relations. We watched proposed that more than school union-like teachers cultivate the organization plan the solution conception. Was the utilization already the qualified teacher, but not yet investigated teacher of the employment, gave the second specialty to give public notice of entrance examination receives training, opened the second specialty teachers to the common teacher to authenticate by the time supplements insufficiency of the teachers. The male even plan is gives comprehensive duty training to the military officer teacher to award the certificate of quality again
The Study of Spacecraft Finite Element Model Updating System
Authors: Liu Xun Tao , Chen Zhao Bo , Huang Shan Yun
Published: October 2011

with the development of finite element technology, finite element model is becoming to the main analysis tool. However, because some theoretic assumptions, unsuitable constraint and uncertain material property are applied, the simulation result of finite element model isn’t different from the testing data. In order to improve the design quality and safety of spacecraft, this paper deduced the formula of spacecraft finite element updating, developed the spacecraft finite element model updating system, the software mainly of five parts: the frequency response function calculation, the loading inverse solution, the finite element model updating, the data display, virtual experimentation. Software can complete exciting force inverse, parameter sensitivity analysis, parameters screening and finite element model updating. The calculation result of updated finite element model is in accordance with testing curve shape on the main vibration direction, first-order frequency error is ±5%, response error is ±10%. Software meet the need of finite element model updating, it provide a software base for spacecraft design.
Tracking Error Modeling of the Theodolite Based on GRNN Method
Authors: Li Miao , Gao Hui Bin
Published: October 2011

To meet the requirement of high tracking accuracy as well as develop more reasonable evaluation method, in this paper, the General Regression Neural Network (GRNN) has been applied to build the tracking error model of the theodolite. First, we analyze the nonlinear factors in the theodolite. Second, we discuss the principle of GRNN, including its structure, the function as well as its priors. Third, we build the tracking error model based on GRNN and verify the model through the different parameters. The result indicated that the network model based on GRNN has high accuracy and good generalization ability. It could instead the real system to a certain extent. The research in this paper has important value to the engineering practice.
The Effect of Discrete Grippers on Sheet Metal Flexible-Gripper Stretch Forming
Authors: Chen Xue , Li Ming Zhe , Zhang Hao Han , Peng He Li
Published: October 2011

Flexible-gripper stretch forming is a new flexible manufacturing process of sheet metal. Four numerical simulation models of discrete grippers were established using finite element method, the effect of the numbers of grippers on stress distribution, thickness distribution and gripping surface shape of the spherical parts were studied. The results show that the clamped edge of the spherical parts formed by using integral grippers is straight，the tensile stress distribution is uneven and the thickness is obviously reduced. However, the stress distribution on the parts formed by using discrete grippers stretch forming is relatively uniform, with the increase in the numbers of grippers, the thickness increases, and the more gripping surface curvature of the parts is close to the curvature of die, the better forming quality of the parts is.
A Quality Model of Lightweight Component for Embedded System
Authors: Jeong Hwa Young , Kim Yoon Ho
Published: October 2011

There are many researches about quality model for general system or information system. That is, it has necessary to know what the important criterion to system benefit is. However, it has lack to research of quality model in the area of embedded system. This article aimed to address quality model for embedded system. For this purpose, we construct each criteria from exist quality model, DeLone and McLean quality model for success information system. And we also depicted quality model network to consider the relation with influence between them.
An Efficient Method for Solder Joint Inspection Based on Statistical Learning
Authors: Kuang Yong Cong , Ouyang Gao Fei , Xie Hong Wei , Zhang Xian Min
Published: October 2011

To improve the performance of current solder joint inspection method, an efficient method based on statistical learning is proposed in this paper. In the method, the solder was divided into several sub-regions to determine the defect type. To resolve imbalance problem, an improved over-sampling algorithm was proposed in which the synthetics samples are generated between the boundary samples and their neighbors. AdaBoost was used for feature selection and classification for every sub-region. Experiments results showed that the defects of solder joints can be identified properly using the proposed algorithm.
Wire Electro Discharge Machining of Al/SiC Metal Matrix Composite
Authors: Ma Bao Ji , Zhu Yu Quan , Jin Xiao Li
Published: October 2011

The machining characteristics of SiC/Al composite using wire electro discharge machining (WEDM) were investigated in this study. Material cutting speed and surface roughness value were adopted to evaluate the machinability. Peak current, pulse on time, pulse duration and working voltage were selected as the input variables to investigate the machining performance. Effects of input variables on the cutting speed and surface roughness were experimentally tested. Peak current, pulse on time and working voltage were confirmed to have positive effects on cutting speed and surface roughness value. Whereas the cutting speed and surface roughness value decrease with the increase of pulse duration.
Characterization of Cr-α-Al2O3 Composite Coatings Electrodeposited from Cr(Ⅲ) Plating Bath
Authors: Sun Xin , He Xiang Zhu , Wang Yong Xiu , Fu Zhi Hong
Published: October 2011

Cr-α-Al2O3composite coatings were prepared by direct current deposition experiments from Cr(Ⅲ) plating bath and the thickness of composite coatings could be up to 14 μm. The obtained Cr-α-Al2O3coatings and Cr coatings were characterized by means of EDS, SEM and microhardness measurement. Results revealed that Cr-α-Al2O3coatings exhibit fine-grained structure with uniform surface and the highest microhardness values(692 HV) when the α-Al2O3content of coatings was 15g/L, although some pores and defects are still present in the coatings. Analysis of Tafel curves indicated that the presence of α-Al2O3in the Cr coatings show better features in the corrosion resistance both in H2SO4and NaOH solution than those prepared from the bath without α-Al2O3.
The Investigation of People Using Air Movement Actively in Summer in Hot-Humid Area of China
Authors: Liu Qian Ni , Zhang Yu Feng , Meng Qing Lin
Published: October 2011

This paper is focused on the relationship between the motivations for people to actively use air movement and indoor climates, with an aim to determine the preferred levels of air movement for the occupants of naturally ventilated buildings in hot and humid climates in China. Based on 429 questionnaires collected in a background survey, 29 college students were chosen to join in the transverse survey. Totally 247 sets of raw data in 5 weeks were obtained. Primary results show that the main motivation of opening window changed from “fresh air” to “cool room and body” as the summer coming. The proportion of wanting more air movement increased as ET* rose, and the ambient and preferred air velocity increased linearly with ET* too.
A New Type of Resonator Designed for Plasma Chemical Vapor Deposition
Authors: Li Zhen Yu , Li Hong Sheng
Published: October 2011

Plasma Chemical Vapor Deposition ( PCVD ) is an important application in making optical fiber core rod. The resonator is the key part for PCVD application. But the existing resonator have several serious disadvantages: its working is not stable; the size of deposited substrate tube is small(Ø31mm); the deposition rate is low(2.5g/min) and the deposition effect is unsymmetrical; the fabrication of the resonator is very difficult and expensive. Therefore, a new type of resonator, a cylinder resonator, is designed to overcome the above disadvantages. The cylinder resonator supports bigger substrate tube (Max Ø60mm) and higher deposition rate(3.2g/min) than existing ones, while its working is also more stable. Since the structure is more simple, the fabrication is easier and cheaper. The corresponding microwave theoretical method of the new resonator designing is also introduced with the necessary computer simulation, as well as test running. And TE111 mode microwave is the Fundamental Mode of the cylinder resonator. The cylinder resonator has been applied in normal production for 4 years, which is better for bigger size core rod making, improving the optical fiber quality and saving cost. It is estimated, after modification with the cylinder resonator and 10kW microwave generator, a PCVD lathe can yield 30% more rods than before.
Design of Three Joints Underactuated Manipulator with Nonholonomic Constraint
Authors: Tan Yue Gang , Li Liang
Published: October 2011

A novel three joints underactuated manipulator has been proposed in this paper. Firstly, the structure features of the manipulator are analyzed. Then, the kinematic model with triangular structure can be converted into the chained form through appropriate design for structural and kinematical parameters. Finally, the result of simulation for three joints underactuated manipulator indicates that the joints angles can be move the desired value by input velocity control of two motors. It is concluded that it is feasible to design controllable manipulator with nonholonomic theory.
Hamming Distance Model Based Power Analysis for Cryptographic Algorithms
Authors: Li Jie , Shan Wei Wei , Tian Chao Xuan
Published: October 2011

In order to evaluate the security of Application Specific Integrated Circuit (ASIC) implemented cryptographic algorithms at an early design stage, a Hamming distance model based power analysis is proposed. The Data Encryption Standard (DES) algorithm is taken as an example to illustrate the threats of differential power analysis (DPA) attack against the security of ASIC chip. A DPA attack against the ASIC implementation of a DES algorithm is realized based on hamming distance power model (HD model), and it realized the attack by successfully guessing the right 48-bit subkey. This result indicates that the power analysis attack based on the HD model is simple, rapid and effective for the design and evaluation of security chips.
Heart Sound Signal Generator Based on LabVIEW
Authors: Tao Ye Wei , Cheng Xie Feng , He Shu Yang , Ge Yan Ping , Huang Yan Hong
Published: October 2011

A heart sounds signal generator in the heart sound analysis instrument based on the LabVIEW is devised. The instrument is developed in PC. Heart sounds signal generator can according to need to produce a synthetic heart sounds signal for users to learn and use. The parameters setting are also discussed to find out the best for the each part. All the parameters can be set by user and the best ones are default values so that the instrument can fit other environment. The running test of this instrument proves it can generate and play heart sound precisely，and can be used as an assistance to show, play, and analyze heart sound
Singular Value Decomposition Control of Electro-Hydraulically Driven Parallel Robot
Authors: Yang Chi Fu , Huang Qi Tao , Han Jun Wei
Published: October 2011

This paper presented a novel control scheme for electro-hydraulically driven parallel robot, in order to improve control performance by eliminating the effect of system coupling in controller. The mathematical model of the electro-hydraulic parallel robot is formulated, including mechanical system and electro-hydraulic system, using Kane method and hydromechanics principle. The decoupled space is exploited for electro-hydraulic parallel robot by using singular value decomposition (SVD) approach. In the decoupled space, a simple but effective controller is developed with only actuator position as its feedback. Theoretical analysis and numerical simulation results show that the proposed control greatly overcomes the drawbacks of dynamic coupling in the workspace of parallel robot and exhibits excellent control performance, especially tracking performance.