bluuebunny/crossref_metadata_2025 huggingface dataset:
Comparison Study on Crossbeam Web Cutout of Different Shapes for Orthotropic Steel Bridge Deck
Authors: Gao Li Qiang , Pu Qian Hui , Han Bing , Liu Zhen Biao
Published: November 2012

For orthotropic steel bridge deck (OSD), principle tensile stresses near the end of joint of crossbeam web and longitudinal rib and at the edge of crossbeam cutout are dependent on the shape of crossbeam cutout to a great extent. They are results of many factors, among which bending-shearing effect and in-plane supporting effect are in-plane factors, unsymmetrical loading effect and relative longitudinal deformation effect are out-of-plane factors. Comparison study on stresses at some fatigue sensitive regions of orthotropic steel deck with six types of crossbeam web cutout indicates that the top height of cutouts determines the distance between the end of joint and the neutral axis, which affects the bending effect seriously, and the area of cutouts determines the shearing effect. When OSD system is affected by bending-shearing effect, increasing the top height decreases the principle tensile stresses near the end of joint but increases the stresses at the edge of cutout, and increasing the area increases the principle tensile stresses both near the end and at the edge of cutout. When the top height of cutouts increases, the contact area between crossbeam web drops, then the principle tensile stresses near the joint produced by in-plane supporting effect increases. When the side width of cutouts increases, the constraint effect of the crossbeam web to longitudinal rib decreases, then the principle tensile stresses near the joint produced by out-of-plane effects decreases. Generally, OSD system with stiff cutouts behaves well when affected by in-plane effects, and OSD system with flexible cutouts behaves well when affected by out-of-plane effects.
Theoretical Calculation and Parametric Analysis of Tunnel Settlements due to Neighboring Over-Length Pile Groups
Authors: Wang Kun
Published: November 2012

According to influence of pile groups of high-rise buildings on metro tunnels nearby, the research is made to analyze the stress of soil and the settlement of neighboring tunnels caused by pile groups. Based on the hypothesis of pile groups under flexible cushion cup, the plain strain of profile of tunnels is calculated by combining the load spreading property along over-length piles and Mindlin answer and the formula of displacement field of soil. In this way, MATLAB programs are made to get some useful conclusions by analyzing the influence factor of the settlements of tunnels such as the distance between them and the collocation of piles, the loading level and the scale of piles.
Excavation Technology of Shield Tunneling in Mixed Ground
Authors: Xu Shi Liang
Published: November 2012

The excavation technology of shield tunneling in mixed ground is described in this paper. The interval metro tunnel is 2004 m long and 8.5 ~ 25 m deep below the ground surface. The 511 m long tunnel is located in the mixed ground. Especialy the upper of tunnel is soil and the lower of tunnel is rock. In order to improve the excavation advance and reduce the excavation cost by shield method, the tunneling mode, excavation parameters, cutter change, construction organization and management are adopted according to the ground properties. The excavation technology is successfully applied and provides a good reference for the similar ground conditions.
Safety Analysis on the Structure of an Existing Metro Station Impacted by the Construction of an Adjacent Building
Authors: Ma Li Heng , Liang Qing Huai , Liu Yi Fan , He Ming Ran
Published: November 2012

Structural deformations of the existing metro station caused by adjacent building construction should be controlled strictly so as to keep the normal operation of the existing metro station and guarantee the safety of the station structure. Based on a foundation pit excavation and building project which is adjacent to an existing metro station in Beijing, a 3D finite element model of foundation pit, metro station and surrounding soil is established. Then, the structural deformations of the main body structure (rail area), the passageway and the fire fighting passageway in different construction stages are obtained. The control values of the station structure deformation during building construction process are proposed according to the calculation results.
Research of Manually Excavated Pile Support for Large Foundation Pit
Authors: Deng Zhi Yong
Published: November 2012

For the large foundation pit, if the soil condition is good, the manually excavated pile support can be used. Based on the foundation pit from one office building project in Ningbo, this paper analyzes the details of the manually excavated pile support, and also analyzes the layout, structural measures and support construction method. This support method will be used more and more widely in the excavation of large foundation pit.
Theory Study by CGM for Moving Force Identification
Authors: Chen Zhen , Han Jun Ling
Published: November 2012

The conjugate gradient method (CGM) is proposed in this paper to improve the ill-posed problem of moving force identification. Based on theoretical analysis, the CGM formula is deduced and applied in moving force identification. Related research shows that the CGM have higher identification accuracy and robust noise immunity as well as producing an acceptable solution to ill-posed cases to some extent comparing with the time domain method (TDM), when they are used to identify the moving force. The theoretical study results by CGM are practical significant to selection properly method for moving force identification.
Mitigation of Seismic Risks to Soft-Storey Structures Using Toggle-Brace-Damper Systems
Authors: Chan Ricky W.K. , Zhao Zhe Fei
Published: November 2012

Soft-storey mechanism is characterized by a sudden reduction of lateral stiffness in one or more levels of a structure. Soft-storey is often observed in the ground level due to the absence of wall or cladding. With recent develop of energy dissipation systems, soft-storey mechanism can be corrected by addition of a damper-brace assembly. In particular, this paper investigates the effect of toggle-damper-brace systems on such situations. Governing equations including the magnification factor and lateral stiffness contributed by a toggle-damper-brace are formulated. It was found that a toggle-damper-brace system, if proportioned correctly, will significantly increase the travel in the damper and overall stiffness of structure can be enhanced. An illustrative example is presented using nonlinear time history analysis implemented on MATLAB.
Study on In Situ Test Based on Survey of Bachu Earthquake
Authors: Li Zhao Yan , Wang Wei Ming , Li Yu Run , Chen Long Wei
Published: November 2012

Based on survey of the Bachu-Jiashi earthquake liquefaction sites, much new basic liquefaction information were obtained and China’s liquefaction database was enriched. A detailed investigation of the Bachu earthquake liquefaction site was conducted, in which three kinds of in situ test measures were used to obtain the site information, and given China mainland SPT data of liquefaction site increase by 40%. By site investigation, international standard liquefaction site CPT data were obtained, and also, the first measurement of liquefaction site data by SPT and CPT index was conducted. With the new data, the feasibility of liquefaction discrimination methods of China was inspected.
Comparative Analysis on Liquefaction Macro-Characteristics of the Three Major Regions in Wenchuan Earthquake
Authors: Wang Wei Ming , Chen Zhuo Shi , Yuan Xiao Ming , Cao Zhen Zhong
Published: November 2012

Through the liquefaction-induced damage of Wenchuan earthquake investigation analysis, this paper studies that the liquefaction features and distribution of the three major liquefied regions in Wenchuan earthquake and the earthquake liquefied damage characteristics are preliminarily comparatively analyzed. The analytical results show that: Mianyang region, Deyang region and Chengdu region are the three major liquefaction affected regions in Wenchuan earthquake. Deyang region is the most serious liquefied region, Chengdu region is the second, and Mianyang region is the lightest. Liquefaction damage was considerably large, and basically was farmland. Liquefied sites mainly concentrated in intensities VIII in Deyang region, the categories of sand ejecta were abundant, and the percentage of gravel ejecta is largest in the three major liquefied regions. Liquefied sites mainly located in intensities VII in Chengdu region, and the sand ejecta covered many sand categories, including fine (silty) sand, medium sand, coarse sand and gravely sand. The liquefaction and relevant damage of Mianyang region were the lightest in the three major liquefied regions, and liquefied sites mainly located in intensities VII. 80% of the sand ejecta were fine-silty sand while coarse sand ejection was not found.
Research on Zoning Technology of the Liquefaction Seismic Settlement Based on MAPGIS
Authors: Lu Xun , Sun Rui , Li Yu Run , Chen Long Wei
Published: November 2012

Liquefaction seismic settlement is one of the typical nature disasters caused by earthquake, which always leads to wall cracking due to uneven settlement of the building. In the previous research work, scientists only study on the failure mechanism and the calculation method of the seismic settlement, the zoning technology about liquefaction seismic settlement have not been proposed. So that, utilizing the function of MAPGIS, this paper puts forward the zoning technology of the liquefaction seismic settlement.
Comparative Analysis of Seismic Responses of Different Layer Height Structures with Broken Stone Isolation Layers
Authors: Zhang Xin Zhong , Miao Lian Juan , Tang Ke Dong
Published: November 2012

For the purpose of doing modal and dynamic analysis, tall building structures and multistory building For the purpose of doing modal and dynamic analysis, tall building structures and multistory building structures of vibration isolation foundation and non-isolation models were established respectively. To elaborate the broken stone isolating layer efficacy, top ten order frequencies and modes, sliding displacements of isolation layer, storey drift angles, storey accelerations, top floor relative displacements compared to the ground movement are obtained and contrasted. The result of the present work implies that the broken stone isolation layers are suitable for multistory buildings.
Study on Antireflection of TiO2-SiO2/SiO2 Double-Layer Films Prepared by Sol-Gel Method
Authors: Lu Jing Ying , Zhao Qing Nan , Hou Shao Hong , Dong Yu Hong
Published: November 2012

TiO2-SiO2 double-layer films are prepared on glass substrates by sol-gel method and dip dipping method. The effect of aging time, heat treatment temperature and molar content of TiO2 for the optical properties of the films have been studied on this paper. And on this basis TiO2-SiO2/SiO2 double-layer films have been prepared as well as the transmittances in the visible range of it have been studied. The results of this paper show that the transmittances of TiO2-SiO2 films in the visible range are reduced with the increasing of sol aging time, molar content of TiO2 and heat treatment temperature; The TiO2-SiO2/SiO2 double-layer films prepared on this basis have antireflective effect, and the average transmittances in the visible range of it are increased nearly 4%-5% more than glass substrate and the transmittance peak reached 100%; the surfaces of the films are smooth; in addition, the cut sides of UV of TiO2-SiO2/SiO2 double-layer films are moved to infrared with the increase of TiO2 content.
Microstructure and Creep Resistance of Mg-(8-12 Wt.%) Zn-(2-6 Wt.%) Al Alloys
Authors: Wan Xiao Feng , Ni Hong Jun , Huang Ming Yu
Published: November 2012

The aim of this paper is to investigate the microstructural characteristics and creep resistance of Mg-(8-12 Wt. %) Zn-(2-6 Wt. %) Al alloys in order to get a better overall understanding of these series alloys. The results indicate that the alloys studied with the ratio of Zn/Al concentration between 2 and 3 exhibit high creep resistances, and the alloy ZA124 with the continuous network of τ precipitate along grain boundaries shows the highest creep resistance. The creep resistance of alloys decreases significantly due to  eutectic phase,  eutectics and β compounds appearing, especially the creep properties of alloys containing  eutectic phase and β phase with lower Zn/Al concentration are obviously inferior to other alloys.
Preparation and Characterization of Polyacrylonitrile-Based Nanofibers by Electrostatic Spinning
Authors: Li Si Yu , Wang Yan Wei , Jun Tan Wen
Published: November 2012

PAN and P(AN-co-MA) nanofibers have been successfully prepared by electrospinning. The mass concentration is 6%-12%, voltage of 15-25 kV, tip-to-collector distance is 25 cm. The morphology of the obtained samples was measured by a Scanning electron microscopy (SEM). The results showed that there were some large beads distributed on the PAN fiber skeleton when the spinning solution concentration is low. With the spinning solution concentration increased, the bead structure is gradually reduced. The fiber diameter increased with the concentration. For the synthetic reaction mixture P(AN-co-MA), it could obtain uniform nanofibers easily
Corrosion Characteristics of 16Mn and Q235B Steel in Natural Seawater
Authors: Liu Yong , Tong Xing Hua , Li Bao Guo , Wang Yan Gang , Zhu Lin Sen
Published: November 2012

In order to study the corrosion characteristics of 16Mn and Q235B steel in natural seawater, the indoor contrast corrosion experiments are carried out in seawater by electrochemical method. Tafel polarization curves and electrochemical impedance spectroscopy (EIS) techniques are employed to investigate the corrosion electrochemical behavior of 16Mn and Q235B steel, which are acquired by electrochemical workstation. The results of polarization curves and EIS reveal the respective corrosion rules of 16Mn and Q235B steel in natural seawater. At last, the different influence of rust layer on the corrosion process of 16Mn and Q235B steel is analyzed contrastively.
Influence of High-Frequency Micro-Forging on Surface Residual Stress of 304 Stainless Steel Sample Fabricated by Laser Prototyping
Authors: Qiu Chang Jun , Zhang Yan , Li Yong , Ye Jiang
Published: November 2012

Two groups of 304 stainless steel samples different in thickness were prepared by Laser Prototyping, one of which was treated by high-frequency micro-forging. The residual stress on the sample surface was measured by strip cutting method. The results showed that the surface residual stress of the samples was tensile stress, which increased with thickness, and the residual stress began to drop while the thickness of samples arrived at a certain value. Therefore high-frequency micro-forging could regulate the surface residual stress state of the samples. Specifically, micro-forging could transform the tensile stress into compressive stress, which rose with the increase in thickness of samples and tended to be stable afterwards.
Study on Surface Hydrophilicity of Polypropylene Non-Woven Treated by Atmospheric Pressure Plasma
Authors: Zhang Yan
Published: November 2012

In this paper, polypropylene (PP) melt blown non-woven fabric is treated by atmospheric pressure N2 or N2/O2 dielectric barrier discharge (DBD) plasma. The variation of the surface hydrophilicity of PP sample is experimentally investigated by surface water contact angle, Fourier transform infrared reflectance spectroscopy (FTIR-ATR). The results show that the hydrophilicity of PP sample is considerably improved as long as the very short plasma treatment time (several seconds). However, the treatment effect of atmospheric N2/O2 plasma is worse than that of atmospheric N2 plasma early in the processing (0-7s). But the treatment effect of atmospheric N2/O2 plasma obtains improvement increasing the treatment time (>7s).
Thermal Property Measurement of Polymer Materials
Authors: Hsu Jiong Shiun , Wen Bor Jiunn , Chang Liang Jian
Published: November 2012

Glass transition temperature is an important thermal property for polymer materials. When its temperature exceeds this temperature, the exhibiting characters dramatically changes. Although the experimental techniques suited to this temperature measurement are well-established, the full-field optical measurement method has not been employed to characterize this property. Therefore, this paper aims to measure the glass transition temperature using optical method.
Porous Metal-Fiber Sintered Felt by Multi-Tooth Cutting and Sintering- Morphological Analysis and Mechanisms
Authors: Yuan Wei , Tang Yong , Yang Xiao Jun
Published: November 2012

This study provides a series of investigation on the morphological characteristics and related mechanisms of a porous metal-fiber sintered felt (PMFSF). Multi-tooth cutting and high-temperature solid-phase sintering are used to create the PMFSF. Based on both modeling and experimental methods, the results suggest that the produced fiber has rough surface and curled shape due to cutting deformation. The processing parameters and material mechanical property both have significant effects on formation of fiber morphology. Results also reveal that the fibers in a PMFSF is randomly distributed and connected with each other by forming sintering necks. Besides, the influences of sintering parameters are also analyzed in this work.
Fretting Wear Behavior of Burnished Pure Copper under Oil Lubrication
Authors: Li Ning , Zhao Jing , Xia Wei , Li Feng Lei
Published: November 2012

Burnishing is an important mechanical surface enhancement technique which can smooth the component surface and improve the component’s fatigue, wear and anti-corrosion properties. Fretting tests lubricated with mineral oil were performed on a pure copper (PC) against a Si3N4 ball. The burnished surface exhibited a significantly improved fretting wear resistance and higher friction coefficient in comparison with the coarse-grained (CG) form. The wear volume of the burnished PC is quite lower than that of the CG PC. The friction coefficient of the CG PC increases with an increasing load, while the friction coefficient of burnished PC decreases with an increasing load up to 100N and then increases. The enhanced wear properties of the burnished surface are correlated with the compressive residual stress and work-hardening, which may partly result from grain refinement induced by burnishing.
The Form Beauty of Product Form Design – The Unity and Variety
Authors: Wen Yan , Sun Hu
Published: November 2012

The basic element of product form design are colors, materials and forms, the foundation of the form beauty lies in different arrangement which gives you visual impact. You must feel not only the innovation at the glance of the classic product design of Apple such as mobile phones, computers but also its unity and instantaneously. This is the perfect performance of the law Unity and Variety. This paper is presented that the unity and variety of product form design is applied in the elements of design such as colors, materials and forms which take Apple design as an example based on the basic law of form beauty principle. And it provides a theoretical basis and references for enterprise to develop a series of product and pave the way for further research.
Study on Stress-Strain Model of Metallic Materials with Shot Peening Residual Stress
Authors: Zhang Tie Shan , Hu Jing , Wu Jin Shui
Published: November 2012

Study on Stress-strain model of metallic materials with residual stress. First of all, Stress-strain model of metallic materials with residual stress was analyzed, then, derivation of a stress-strain model was done. Finally, according to the model of stress and strain analysis and derivation of results, taking diaphragm spring as an example, using methods of derivation of kinds of material obtained from this model portfolio, using finite element modeling tools, calculate the relationship between load and deformation. The test result indicated that, using the method of many kinds of material model combination can get the higher precision of calculation.
Effects of Pure Water on the Tribological Properties of Self-Mated Titanium
Authors: Chang Yuh Ping , Horng Jeng Haur , Chou Huann Ming , Wang Jin Chi
Published: November 2012

The novel method of using continuous variations of the electrical contact resistance and the friction coefficient for monitoring the tribological properties and the wear mechanisms of titanium pairs in air had been applied successfully by the authors. Therefore, this study further investigated the tribological properties and the wear mechanisms of self-mated titanium in pure water. In order to investigate the chemical reactions of titanium sliding against under water lubrication, the continuous variations of electrical contact resistance and friction coefficient were measured. SEM was used to observe the microstructures and of material transfer. The variations of electrical contact resistance were shown to produce clear and strong signals, superior to monitoring continuous friction coefficient variations for the self-mated titanium in pure water. According to the variations of electrical contact resistance, TiO2 was inferred to form at the interfaces of self-mated titanium in pure water. All of the experimental results demonstrated that the water lubrication has great potential for the research.
The Effects of Strong Oxidizing Slurry and Processing Atmosphere on Double-Sided CMP of SiC Wafer
Authors: Yin Tao , Doi Toshiro , Kurokawa Syuhei , Ohnishi Osamu , Yamazaki Tsutomu , Wang Zhi Da , Tan Zhe
Published: November 2012

In order to achieve high removal rate and high-quality processing on SiC wafer, we carried out the CMP processing experiment with the new type CMP machine (Bell-jar) by using the slurry with the addition of strong oxidant (KMnO4). It was found that the high speed CMP processing was achieved by controlling the concentration of KMnO4 in the slurry, the pH of slurry and the processing atmosphere. By using the slurry with the addition of KMnO4 of 0.1mol/L, the removal rate was the fastest up to 1019nm/h in the fixed pH of 6. By use of the slurry of pH 3, the removal rate of C-face of SiC wafer was 1695nm/h On the other hand, the fastest removal rate of Si-face of SiC wafer was only 51nm/h by using the slurry whose pH is 7. In the open air atmosphere, the removal rate was 915nm/h, which was higher than that at the higher and lower atmospheric pressure.
Nonlinear Viscoelastic Analysis of Double Base Propellant
Authors: Xu Jin Sheng , Ju Yu Tao , Zhou Chang Sheng
Published: November 2012

This study presents the characterization of the nonlinearly viscoelastic behavior of double base propellant (DBP) using Schapery-type constitutive model in the different conditions of temperature, strain level and strain rate. A recursive-iterative numerical algorithm is generated for the Schapery-type nonlinearly viscoelastic constitutive and implemented in a displacement-based ﬁnite element (FE) code for ABAQUS user material subroutines. Then, the model parameters are obtained by analyzing the response of creep-recovery tests and constant rate tensile tests at different temperatures, strain levels and strain rates. And find a linear relationship between temperatures and the effective stresses which determine the limit of linear viscoelactic. The FE model with the calibrated time-dependent and nonlinear material parameters is used to simulate the creep-recovery tests and the constant rate tensile tests, and reasonable predictions are shown.
Magnetic Detector Based on GMI Effect of Amorphous Wire
Authors: Wei Shuang Cheng , Deng Jia Hao , Han Chao , Yang Yu Ying , Cui Jing
Published: November 2012

The giant magneto-impedance (GMI) effect of amorphous wire and its affecting factors were analyzed. Magnetic impedance (MI) element was designed with a special structure. So the difficulties of complex negative feedback circuit and winding double circuits on amorphous wire were solved. High frequency current pulse generator, signal preprocessing circuit and digital signal processing module were designed. Thus a low magnetic field detector was realized. The sensor and the detector were tested in laboratory. The experiment results proved that the sensor had good linearity at the magnetic field range from -3 Oe to +3 Oe. The sensitivity reached 65 mv/Oe and the sensor had well temperature stability. The magnetic field resolution can reach 50 μOe and small magnetic target can be detected.
Analysis of Wireless Energy Transfer System Using Magnetic Resonant Coupling
Authors: Li Wei Xin , Zhang He
Published: November 2012

In order to research the relationship between coupling distance and transmission efficiency, study on the transmission characteristics of magnetic resonant coupling for wireless power transmission system, simulation model of wireless power transmission system via magnetic resonance coupling were established based on the theory of two ports network analysis method. The frequency expression of maximum efficiency and the resonant frequency splitting phenomenon condition of a contact-less power transmission system were derived. In a weak coupling at resonance, magnetic resonant coupling can transfer energy with high efficiency. The resonant frequency changes from two to one depending on the critical condition. Until a certain distance, maximum efficiencies are not got. The transmission characteristics of this system were researched by simulation software and experiments. The results show that the transmission characteristics are consistent with theoretical analysis and simulation.
Model-Free High Order Sliding Controller for Underwater Vehicle with Transient Process
Authors: Deng Chun Nan , Ge Tong
Published: November 2012

Underwater environment is highly dynamic,presenting significant disturbances to the vehicle in the form of underwater currents.Additionally,the main difficulties associated with underwater control are the parametric uncertainties. The model-based controller need precise hydrodynamic coeffcients or the model of ROV,but in practice it is very hard or impossible.In order to avoid this problem,a model-free high order sliding mode controller is proposed,and design a reasonable transient process which make the controller have a good performance for any initial error condition.Performance of the proposed controller is verified using numerical simulations,implemented in a four freedom nonlinear underwater vehicle model. Simulation results show that exponential fast convergence of position and attitude,overshooting is very small,for any initial condition.And the controller is proposed needs few parameters to adjust. Algorithm is very easy to complie,could meet the engineering needs.
Plastic End Cap Injection Tool Design and Molding Analysis Based on Software Ug and Moldflow
Authors: Xia Yu
Published: November 2012

Software UG is used to design plastic end cap injection tools and to do injection molding analysis. Firstly, use the modeling function of the software to design the structure of a plastic product. Secondly, design the mold according to characteristics of the product and generate a tool drawing. Finally, use moldflow software to analyze injection system of a 2-cavity tool, the best position of feed gate and plastic flow in the cavities, to improve the type, size and position of the feed gate and distribution of runners, as well as to reduce the cycle time and processing cost to the largest extent. This paper is to adopt Moldflow software to analyze the temperature, pressure and filling of the designed injection molding, and determine the design structure of the molding through improving the molding design according to the analysis results.
Optimization Design of the Crane Girder Based on Adaptive Genetic Algorithm
Authors: Wang Peng Fei , Diao Xiu Hui
Published: November 2012

With taking weight of single main beam of gantry crane as objective function, and taking main beam upper & lower cored, diagonal & horizontal bracing, and width & weight as design variable, this essay adopted population diversity adaptive genetic algorithm to optimize its structure and improved program design through MATLAB. This algorithm could accelerate convergence speed, which make much it easier to realize comprehensive optimal solution, since it effectively avoided weakness of basic genetic algorithm, such as partial optimal solution, prematurity and being lack of continuity, etc.
Wireless Remote Control Design of the De-Icing Robot
Authors: Liu Huan , Jiang Bing Hua , Liu Fang Bing , Xu Qing Song
Published: November 2012

In this paper, we studied de-icing robot wireless remote control system. According to the actual operating environment of the de-icing robot, we analyzed the operational requirements of the robot and the control requirements of remote control system. A new wireless remote control circuit has designed based on APC220-43 module implemented in design hardware and software. Experiments and the actual operation had shown that the reliability of the wireless remote control system.
Research on Data Acquisition System of Ship Measurement and Control Device Check Equipment
Authors: Yu Hai Yan , Meng Hai Bo , Song Qi , Deng Tian Yong
Published: November 2012

Ship measurement and control device check equipment has realized the intelligent check of ship measurement and control device’s functional modules which have the function of parameter measuring, data acquisition, calculation, communication and power supply.It need to complete multiple parameters’data acquisition and operation above all, this paper introduces the process of data acquisition and operation of industrial control computer’s PCI cards by using VC program. The PCI cards include PCI-1713,PCI-1724,PCI-1758UDI,PCI-1758UDO,PCI-1612CU.It realizes the data acquisition and operation of industrial control computer’s analog input\output PCI cards,digital input\output PCI cards and communication PCI card. It completes the data acquisition function of check equipment. it satisfys the need of realtime and high accuracy of check equipment,it can used to other data acquisition systems.
The Design of Variable Frequency and Constant Pressure Water Supply System Based on Fuzzy Control
Authors: Wang Yu Lin , Hu Yao Bin , Wei Peng , Jiang Yan , Xie Jing
Published: November 2012

This article starts from energy saving and improving energy efficiency, analyzes the characteristics of the pump and collects the pipe network pressure periodically by the pressure sensor, and then we can get the differential pressure signal and send it into fuzzy controller after comparing the pipe network pressure with the set pressure. After a series of fuzzy arithmetic and solution of fuzzy arithmetic, the fuzzy controller sends a precise control into the PID regulator to control output frequency of the frequency converter, so as to achieve the purpose of pump speed controlling and energy-saving.
Automatic Alignment of 3D Point Clouds to Orthographic Images
Authors: Xiong Zi Ming , Wan Gang , Cao Xue Feng
Published: November 2012

Recent progress in structure-from-motion (SfM) has led to robust techniques that can operate in extremely general conditions. However, a limitation of SfM is that the scene can only be recovered up to a similarity transformation. We address the problem of automatically aligning 3D point clouds from SfM reconstructions to orthographic images. We extract feature lines from 3D point clouds, and project the feature lines onto the ground plane to create a 2D feature lines. So we reduce this alignment problem to a 2D line to 2D line alignment(match), and a novel technique for the automatic feature lines matching is presented in this paper.
Design and Analysis of Folding Mechanism for a New Folding Car
Authors: Zhao Li Jie , Li Yan , Chen Huan
Published: November 2012

This paper is focus on design and analysis of folding mechanism for a new folding car. Through analyzing folding principle of different folding cars, one chassis folding type car is introduced. A group of lever linkage is determined to realize the folding effect according to the main function designed and the overall dimension of bodywork. Based on the prototype made by earlier stage of the research, three-dimensional model is established and simulated in motion by the use of UG package. For the validation of this mechanism, modal analysis of the chassis is conducted in terms of ANSYS package.
Short-Term Electricity Price Forecasting Based on MPSO-BP Algorithm
Authors: Dong Yu , Yang Qiang , Yan Wen Jun
Published: November 2012

In this paper, we exploited the short-term electricity price forecasting issue by introducing a global search mechanism based on the improved particle swarm optimization (MPSO) algorithm for the neural network training. The proposed MPSO algorithm is used for the initial weights and threshold of BP neural network in the process of optimization. We then proposed a novel short-term electricity price forecasting model based on MPSO-BP neural network. The paper provides a number of examples of bidding model of the California electricity market to forecasting market clear price using BP neural network trained by MPSO. Through the comparative study of the conventional BP neural network and the proposed MPSO-BP neural network, the proposed method demonstrates improved performance in finding the optimal solution with excellent convergence time for all the simulated scenarios.
Study on the Strength Design for Steel Hourglass Worm Pairs of Track Tension Adjustor on Special Vehicles
Authors: Li Zhu Jun , Yang Yong
Published: November 2012

This study analyzed the difference between the steel worm gear in the worm type track regulator and the commonly power hourglass worm. And a strength design method of steel worm gear pair in the track regulator was presented based on the design method of hourglass worm gear: According to the condition of manual adjustment, the strength design of the worm gear pair worm material is tin bronze material , select primary center distance a1, And then according to the difference on the carrying capacity the steel worm gear and tin-bronze worm gear, correct primary center distance a1, Finally check the contact strength of tooth surface when locking condition.
Bringing Path Planning and Lean Automation Together
Authors: Polden Joseph , Pan Zeng Xi , Larkin Nathan , van Duin Stephen
Published: November 2012

In order to achieve higher productivity and flexibility, manufacturing industry is turning increasingly to robotics based lean automation systems. This lean approach presents a series of new challenges for the control, operation and programming of robotic hardware implemented to carry out a range of manufacturing processes. This paper reviews relevant path planning methodologies alongside a specific set of requirements for a manipulator operating in a lean automation workcell. Then, new challenges to path planning for a lean automation system are presented. Finally, a framework for a new path planner is developed and its performance is compared to existing methods.
A Modified Binary Quantum-Behaved Particle Swarm Optimization Algorithm with Bit Crossover Operator
Authors: Xi Mao Long , Sun Jun
Published: November 2012

Particle swarm optimization algorithm with binary encoding (BQPSO) is an intelligent algorithm which is the binary version of particle swarm optimization (QPSO) and can solve the problem in discrete space. This paper analyzes BQPSO, especially discusses the crossover method of bits in algorithm. The paper proposes that the crossover operation of particles should be crossed from bit to bit randomly in algorithm. And the new bit crossover operator is used in computing the coordinate of the local attractor to increasing the diversity of populations and improves the global searching ability of algorithm, and then a modified BQPSO algorithm is proposed. The proposed new algorithm is tested on several functions and compared with BPSO. The experiment results show the superiority of BQPSO
FBG Intrusion Recognition Algorithm Based on SVM
Authors: Wang Jian
Published: November 2012

The perimeter security alarm system, with the core of vibration sensor based on FBG optical fiber invented by Wuhan University of Technology optical fiber research center, uses the changes of optical fiber grating stress wavelength to detect intrusion. As FBG wavelengths change when under stress, the intrusion detection is identified by the combination of signals time domain and frequency band domain. However, it is difficult to classify the data of signals time domain and frequency band domain because of the complexity of the actual conditions and the diversity of interference and intrusion. Therefore, applying SVM to train and process the classification features extracted from the various data acquisition can help to obtain the corresponding support vector and weighting coefficient. As a result, the effective classification of the field test data can be achieved by using SVM template method.
Quadruped Robot Omni-Directional Walking on a Slope Based on Static Balance
Authors: Zhang Wen Yu , Zhang Lei
Published: November 2012

Quadruped robot is widely developed on the basis of bionic technology and has good structural stability and flexibility in uneven terrain. It is required of the quadruped robot to keep static balance while transportation task is executed. In this paper, first, the unstable problems during static walking on a slope have been analyzed in detail, and the stability criterion which considering affections of slope walking environment has been proposed. Based on static balance, the falling over problem and tumbling around the line connecting two support feet during gait transition problem have been solved. The gaits are planned to ensure omni-directional stable walking on a slope. Through walking experiments by computer simulation, the validity of the proposed method has been verified.
Research on Similarity Scaling of Structure for Compressor Disc
Authors: Tian Da Ke , Liu Xu Yang
Published: November 2012

To study the similarity scaling of structure for compressor disc, based on the basic rules of similarity scaling, physical speed of five linear scale factors (LSF) is determined, and the ratio of between centrifugal force and LSF is established, then the centrifugal force of single rotor blade and single rim flange with different LSF is obtained. Using the method of finite element numerical simulation, strength of four assessment projects including circumferential stress of disc heart, circumferential stress of cylindrical surface, radial stress of cylindrical surface and circumferential stress of meridian plane is analyzed. The results show that the maximum relative error among four assessment projects is only 2.60%, and stress level of disc corresponding to the different LSF is very close to each other. Then a conclusion can be got that the stress level of disc is little difference with itself geometry size, and the structure of disc can be designed pro rata scaling.
Hybrid Neural Network Models of Six-Axis Force Sensor
Authors: Chen Sheng Lai , Hong Jian Zhong
Published: November 2012

A method of analyzing the Six-axis force measuring system by hybrid modeling is introduced in this paper. The mapping function of signal voltage output, which is input vectors of the Neural Network (NN) model, and measuring force signal, which is output vectors of the NN model, is represented as two parts. The determined linear part obtains the main principle and the the information of transfer matrix. The undetermined nonlinear part are estimated by neural network. The problems about nonlinear error and coupling are solved. The accuracy and feasibility of the method are displayed by the result of experiment data simulation.
Mechanical Analysis of the Jumping Motion of a Spherical Robot
Authors: Zhao Wei , Sun Han Xu , Jia Qing Xuan , Zhang Yan Heng , Yu Tao
Published: November 2012

The obstacle surmounting capability of traditional spherical mobile robot is limited, especially when the spherical mobile robot comes across vertical barrier. In this paper we design a new kind of spherical mobile robot with two-mass-one-spring mechanism based on tradition spherical mobile robot. This spherical robot could not only move agility and move with the zero turning radius like traditional spherical mobile robot but also jump in three-dimensional space. In this paper we build the mathematical model of robot jumping with friction. Numeric simulations are carried out for the model using Matlab and ADAMS, we get the similar curve. These simulation results verify the validity of the mechanics model. At last we design an experimental facility, verify the model of robot jumping by experiment. Our work will be the base of model machine designing.
Research on Data Processing Method of Three Dimensional Machine Vision System
Authors: Cao Jin Ling , Luo Ying , Li Zhi
Published: November 2012

This paper mostly discusses the data processing in 3D machine vision system, especially the data processing technology and algorithm involved, and gives two simple and useful method of data processing. Main content mainly includes distance noise-deleting, multi-filtering, multi-condensing and limit dot-detecting, puts forward a simple, quick, and practical noise points disposal distance identifying method, and put forward a kind of compound method of filtering. Through the example to prove that this method is more satisfied with the treatment effect.
The Steam Generator Water Level System Based on Nonlinear First Order ADRC Control
Authors: Li Jin , Ma Jia Wei , Liu Xiao Jun
Published: November 2012

The Steam Generator with the characteristics nonlinear, time varying, and non-minimum phase whose water level will fluctuate significantly when it encounters inner disturbance or outside interference. For the above problem, the ADRC of steam generator will be designed in this article. Based on the dynamic characteristics of steam generator, equivalent the steam generator model to be the generalized first order system and establish control system based on nonlinear first order ADRC. The simulation results show that the proposed control strategy can achieve better control performance.
Data Acquisition Design Based on the STM32
Authors: Zhang Tuan Shan , Li Ya Mei
Published: November 2012

In the automation industry, the data collection used in the site is the key basic technology to ensure the product quality and normal operation of the production system.With the development of information technology, data acquisition technology is widely used in industry field. High-speed, real-time data acquisition has a very important application in the field of industrial automation.The speed of A/D chip is becoming faster and data acquisition system requires higher transmission speed.Traditional communications style is restricted by the slow transmitting rate,weak anti-jamming ability and will be replaced by USB, the new generation Universal Serial Bus.This thesis analyzed characteristics of Universal Serial Bus and the requirement of data acquisition system based on USB. Lastly, a data acquisition system based on STM32 MCU was designed.
LADRC Control for the Three-Phase Voltage-Type PWM Rectifier
Authors: Zhang Jin Fang , Yao En Li , Xing Jin Chao
Published: November 2012

In the three-phase voltage-type pulse width modulation (PWM) inverter system, the steady DC-bus voltage is significant for normal operation of PWM converter. With traditional control method, DC-bus voltage has poor anti-disturbance performance and large steady-state error generated by parametric uncertainties of inductive resistance and switching devices’ equivalent resistance. To cope with these problems, a linear active disturbance rejection control (LADRC) controller is designed based on the advantages of the LADRC in processing system internal perturbation and external disturbance. The simulation study shows that under the same disturbance the proposed method can realize not only faster dynamic response and better property of anti-disturbance performance, but also unity power factor control. For the uncertainties of AC equivalent resistance and inductance, the method shows strong adaptability and robustness.
Dynamic Modeling of Industrial Robot Based on Support Vector Machine Regression Algorithm
Authors: Huang Chen Hua , Cai Xiao Meng , Mao Gui Sheng
Published: November 2012

The industrial robot is a highly nonlinear and highly coupled device, and the calculation of the dynamic model needs to spend a lot of time, which result in difficult to achieve dynamic control. Using of intelligent algorithm to model the robot dynamics has been the field of robotics research focus. This paper proposes a method based on support vector machine regression algorithm to model the robot dynamics. The angle acceleration coefficient, and the centripetal acceleration and Coriolis acceleration coefficient, and the gravity in the robot dynamics equation are predicted based on support vector machine regression. When the support vector machine is trained, parameters in the robot dynamics equation don’t rely on the position of each joint any more. Modeling process was described in detail by using a two degree of freedom robot. All the parameters are simulated. Simulation results show that the method has the characteristic of high precision, and short training time.
A S-Shape Curve Speed Control Algorithm of Continuous Micro-Lines Interpolation Based on Adjustable Feed-Speed
Authors: Shi Zhong Quan , Ding Kun
Published: November 2012

To satisfy the need of high speed machining, according to machine's features and turning angle between micro-lines, constraining conditions of micro-lines turning feed speed are established in this paper. The algorithm is calculating the resolution of the end velocity of last line and the startup velocity of next line, and then deduce the acceleration on each axis. The resolution acceleration of each axis reflects the loading capacity of them and should not over a given value. Then a S-shape curve speed control algorithm of continuous micro-line interpolation based on adjustable real-time feed-speed is designed. When maximum feed velocity in a line changes from a low value to a high one suddenly, the velocity also tends to target smoothly by S-shape curve, and the velocity decreases to the end speed value in advance, and the total interpolation time decreases, machining efficiency rises evidently. At last, experiment which performed on the CNC system verifies the control algorithm. The result indicates that the algorithm can enhance the machining efficiency and improve surface quality based on assuring the machining precision.
Pseudo Two-Hop Distributed Consensus Algorithm with Link Failure
Authors: Peng Huan Xin , Wang Wen Kai
Published: November 2012

For time-delay, noise and network congestion in the communication among agents, there are often random communication link failures among agents. In this paper, we analyze the pseudo two-hop distributed consensus algorithm with link failures, and research the relation between convergence performance and the probability of link failures. Supposing that the probability of link failures in every link is independent identically distributed, we analyze the convergence performance of the pseudo two-hop distributed consensus algorithm with link failures, and simulation results are provided to verify these analytical results.