bluuebunny/crossref_metadata_2025 huggingface dataset:
Nouvelles stratégies de la classe vectorialiste
Authors: Wark McKenzie , Degoutin Christophe
Published: February 2014

Les nouvelles luttes de classes relatives à la propriété de l’information opposent désormais la classe des hackers, qui créent, inventent, explorent, découvrent, à la classe vectorialiste, qui, en s’étant approprié l’accès aux vecteurs de communication, dispose seule des moyens de réaliser la valeur de ces créations. Les pratiques des réseaux libres, la spontanéité du travail gratuit, l’analogie du jeu : tout cela semblait jouer contre les anciennes formes de pouvoir vectorialiste, mais se trouve désormais mis au service de nouvelles formes d’exploitation. Seul un financement universel de nos besoins sociaux fondamentaux peut assurer la reproduction de nos biens intellectuels communs.
Coordinated Path Planning Based on RRT Algorithm for Robot
Authors: Gong Li , Zhang Yong , Cheng Jin
Published: February 2014

In this paper, two robots in different positions with two different paths are planned based on RRT algorithm. And two robots search the ball according to the planned paths coordinated with each other under the circumstance of existing static obstacles. Simulation result showed that the correctness of the planned path. RRT algorithm is suitable for path planning of high dimensional robot under complex environment, which avoids complicated modeling of robot and obstacles in C space. And RRT algorithm uses tree structure, which tracks between adjacent node accord with requirements of robots kinematics, dynamics and avoiding collision. Therefore, it is suitable for practical application of robots.
The Dynamic Path Planning of UAV Based on A* Algorithm
Authors: Chen Xia , Chen Xiang Min , Zhang Jing
Published: February 2014

According to the problem that the intelligence is not high of the soccer robot, using the mechanical theory as a guide, making some mechanical analyses and calculations on the pressure and transmutation states of chip kick mechanics, and conducting optimal design too, then making the structure of chip kick mechanics more and more rationalization. Experiments show that the new soccer robot controller features a quick response and high servo rigidity, and provide a kind of method for improving and perfecting the soccer robot control system, at the same time, filling the needs of producing.
Study on Multi-UAV Air Combat Game Based on Fuzzy Strategy
Authors: Chen Xia , Wang Yi Fei
Published: February 2014

Multiple unmanned aerial vehicles (UAV) cooperative alliance combat is a new research problem. Through considering cooperative alliance's target value income index function, damage cost index function and voyage cost index function, the multi-UAV alliance cooperative game model is established in the paper, and its game matrix is structured. The definition of alliance characteristic function and mixed strategy Nash equilibrium are provided, the mixed strategy Nash equilibrium is obtained by using particle swarm optimization, and the cooperative game is solved by applying the method. At last, the feasibility and effectiveness of the method are presented by simulation results.
Control of Small Unconventional UAV Based on an On-Line Adaptive ADRC System
Authors: Gao Tong Yue , Wang Dong Dong , Tao Fei , Ge Hai Lang
Published: February 2014

Recently, the UAV has become the research focus at home and abroad. this paper puts forward a unconventional type: double ducted tilting Subminiature UAV system (SUAV) , and carries out the research of the control system for this SUAV. Since SUAV flight attitude control process has strong time-varying characteristics, and there are random disturbances, the conventional control methods with unchanged parameters are often unworkable. An on-line adaptive ADRC control system is designed in this paper. An on-line adaptive ADRC system implements a simultaneous on-line tuning of ADRC rules and output scale of ADRC control system. The flight experiment showed that the proposed adaptive ADRC system provides quicker response, smaller overshoot, higher precision, robustness and adaptive ability. It satisfies the needs of autonomous flight.
Robust Speed Control Algorithm of Welding Wire Feed System Based on the State Space Model
Authors: Wu Xiu Mei , Sha Li Min , Si Tao Zi , Jiang Lei
Published: February 2014

In the modern welding technology of metal materials, the welding robot is a very important factor. And the welding wire feeding device is a very important part of the welding robot. The welding wire feed systems stabilization and reliability is essential for the welding quality. The resistance is caused by the draw of welding wire and other factors, which is highly nonlinear and stochastic. The wire feed rate and welding quality will be severely affected by the resistance. This paper investigates the method controlling the system according to the observations of the resistance, speed and other factors. There are the complex environmental factors in the welding process, such as the strong magnetic field and high current field, which are random. So the robust control algorithm based on the state space model is designed to keep the welding wire feed speed stable under disturbances. The robust control method can improve the speed of response and eliminate the effect of wire feed resistance to the wire feed speed. Even when disturbed, the system can quickly reach a stable wire feed speed.
Vibration Fatigue Analysis for the Frame of Vehicle Equipment
Authors: Yang Chao , Xiao Shou Ne , Zhu Tao
Published: February 2014

Traditional fatigue analysis approaches could not solve the structure fatigue failure caused by resonances. The time domain simulation approach which took the structural intrinsic property into account was presented to solve vibration fatigue problems. The vibration fatigue failure of the frame of vehicle equipment was studied. Broadband vibration loads were put into the finite element model of the frame as excitations, the stress power spectral density of a dangerous point was calculated. At last, the Dirlik method and the time domain simulation approach were used to calculate the fatigue life. The results show that the damage caused by the first-order vertical flexural vibration is the largest; the result of the time domain simulation approach has a good agreement with the experimental result when compared with the frequency domain method.
A Short-Term Power Load Forecasting Method Based on BP Neural Network
Authors: Li Ling Juan , Huang Wen
Published: February 2014

Short-term power load forecasting is very important for the electric power market, and the forecasting method should have high accuracy and high speed. A three-layer BP neural network has the ability to approximate any N-dimensional continuous function with arbitrary precision. In this paper, a short-term power load forecasting method based on BP neural network is proposed. This method uses the three-layer neural network with single hidden layer as forecast model. In order to improve the training speed of BP neural network and the forecasting efficiency, this method firstly reduces the factors which affect load forecasting by using rough set theory, then takes the reduced data as input variables of the BP neural network model, and gets the forecast value by using back-propagation algorithm. The forecasting results with real data show that the proposed method has high accuracy and low complexity in short-term power load forecasting.
Flow Field Analysis of HVAC Face-Blowing Duct Based on CFD
Authors: Li Fu Sheng
Published: February 2014

Finite element model of airflow field inside the face-blowing duct of air conditioning system on a light bus was established according to its special structural characteristics. With computational fluid dynamic (CFD) theory and method, the airflow field was simulated in software Fluent to obtain the airflow distribution to each outlet. Based on requirements of riding comfort performance, structural optimizing measures were presented to get smoother airflow field inside and more reasonable airflow distribution of outlets.
The Study on the Nanocutting by Rigid Body Tool at the Gas Environment Using Molecular Dynamics Simulations
Authors: Huang Jen Ching , Cheng Fu Jen
Published: February 2014

This study successfully simulated the single crystal copper nanocutting with a rigid body tool at the nitrogen gas environment using molecular dynamics, and analyzed the workpiece stress distribution and dislocation during nanocutting. After simulations, a diamond rigid tool with a completely sharp produce a shear plane during cutting. The distribution of equivalent stress was greatest at the shear zone and that residual stress occurred on the machined surface. And the stress gets smaller as the distance from the chip surface is farther.
Mold Design for a Composite Core-Pulling Mechanism
Authors: Yin Yan Fang , Hu Hua Shun
Published: February 2014

This work's context is an industrial project aiming the accurate modeling of the injection molding process.The main purpose of this work was to design a mathematical model and computer programs for design analysis in composite core-pulling mechanism. The injection mould with slanted guide pillar for two-step core-pulling from the side of the product effects significantly the quality and efficiency of plastic part. The study is a one-dimensional analysis of secondaryejector mechanism, based on a forward marching technique of solution for the simple structure and high safety and reliability. 3D numerical simulation of the different stages is considered: during processing, anisotropy of the stress state build up affects its mechanical or dimensional properties once the part is ejected. Using the simulation analysis of mechanical system based on Pro/E, the mechanism can solve the problem that plastic parts are difficult to side core pulling in different directions by the use of bevel pillar.
Comparison of the Geometric Accuracy by DSIF Toolpath with SPIF Toolpath
Authors: Wu Jin Han , Wang Qiu Cheng
Published: February 2014

As there is no sufficient support between the single moving tool and fixture, the formed metal sheet is easy to bend in single point incremental forming (SPIF). Double sided incremental forming (DSIF) is proposed in which two tools are used on each side of the sheet to improve the components forming accuracy. Element finite method is introduced to simulate the forming process with both DSIF and SPIF toolpaths and the component geometric accuracies are compared. The simulation result shows the DSIF toolpaths can obtain better geometric accuracy than SPIF.
Design of an Ultrasonic Pointed Cutter
Authors: Zhang Yun Dian , Shen Ying Bin , Lu Zhi Ping
Published: February 2014

Ultrasonic cutting technique is an advanced processing method of cutting honeycomb materials. An ultrasonic pointed cutter was designed. Combined with the principle of ultrasonic cutting, the mathematical model of the tool was established. Modal analysis of the tool was calculated with the finite element software to study the effects of tool geometry on the natural frequency. The results show that the natural frequency increases as the tool thickness increases, but it decreases as the tool length increases. And it obtained the modal shapes and natural frequencies of the tool which meet design requirements. The optimal geometry of the tool was also determined. Finally, it verified the rationality of tool design by amplitude measurement experiment of the tool.
Analysis on the Influence for the Sectional Shape of Compound Pressure-Equalizing Groove to the Supporting and Bearing Characteristics of Precision Aerostatic Bearing
Authors: Qiao Yu Jing , Luo Rui , Shi Ke Jian
Published: February 2014

Static bearing capacity and static stiffness of pressure equalizing groove cross section with the same width and depth are researched in this paper, it can conclude that the trapezoidal section has the maximum static bearing capacity and static stiffness, while air consumption rate of unit load is the lowest. When compound structure annular hydrostatic thrust bearing has had the optimizing parameters, compared with the single structure one, the bearing capacity had a substantial increasing.
Effects of Twisted and Cylindrical Blades on the Flow Characteristics inside Blade Inlet and Outlet for a Centrifugal Pump
Authors: Deng Xin , Yuan Shou Qi , Si Qiao Rui , Yuan Jian Ping , Zhang Jin Feng
Published: February 2014

In this paper, the performance between cylindrical and twisted blades are analyzed for the same centrifugal pump. The three-dimensional steady and unsteady flow fields under 0.7Qd, Qd and 1.3Qd are simulated. The blade inlet and outlet flow and pressure pulsation inside the centrifugal pumps are discussed by using mathematical statistics and frequency domain analysis methods. The research is verified by experiments. The results show that the twisted blade controls blade outlet better than cylindrical blade at small flow and design flow, cylindrical blade controls blade outlet better than twisted blade at large flow. In the blade inlet and outlet, as the flow changes, the instability of cylindrical blade loading is higher than that of twisted blade. The cylindrical blade inlet pressure is affected by the shaft frequency more than that of the twisted blade. At shaft frequency and blade frequency, pressure pulsation coefficient of cylindrical blade outlet is higher than that of twisted blade outlet. The cylindrical and twisted blades effect on the blade inlet and middle gradually accumulates, resulting twisted blade outlet has larger pressure pulsation. The result can guide the optimum design of centrifugal pump to consider the performance balance between twisted and cylindrical blades.
Analysis of Vehicle Interior Low-Frequency Noise Based on ATV
Authors: Ma Long , Xia Wen Feng
Published: February 2014

The FEM model of the body and acoustic cavity are created, and the acoustic-structure coupled system is built up,and the SPL(sound press level) of points corresponding to the drivers ear and passengers ears were calculated using software LMS.virtual.lab. And there are several relatively noticeable acoustic pressure peaks around 60Hz, 102Hz, 120Hz and 168Hz. The maximum noise value was calculated by using the method of ATV method, several suggestions are advised to decrease the vehicle interior noise so that the vehicle ride comfort could be improved.
Analysis of Performance of Automotive Exhaust Muffler Based on ANSYS Finite Element
Authors: Ma Jian Hui , Guo Peng
Published: February 2014

At present, the control of the automobile engine exhaust noise is mainly installed exhaust muffler. Muffler design and performance research mainly around the silencing performance and the influence to engine power loss. This article built the 3d modeling of automobile exhaust muffler and through simulation analysis obtained the muffler internal acoustic pressure distribution and changes of insertion loss with frequency. Predict the silencer muffler performance as well as the influence on engine power loss. Provide a reference basis for the design of the silencer and optimization. Compared to the traditional experiment method, the method in this article has the advantages of short cycle, low cost.
Study on 3D Modeling and Flow Field Simulation of Urea-SCR Catalytic Converter
Authors: Liu Zhi Lin
Published: February 2014

In this paper, the study on 3D modeling and flow field simulation of Urea-SCR system which installed on the tested diesel engine. After the research of Urea-SCR reaction theory and the time scale of each physical and chemical reaction process, the numerical model of SCR system was established. Through the analysis of the factors such as velocity, temperature and pressure of flow field at characteristic operating points, verifying the reliability of the model, which has important guiding significance to the structure design of Urea-SCR system.
The Relationships of Prior Information and Interval Partition on the Forecasting Effect of Fuzzy Time Series Two-Factor Model
Authors: Lin Yueh Ju , Wang Chi Chen
Published: February 2014

This study uses two data sets, Taiwanese export values as the prediction varialbe and its foreign exchange spot rates as the auxiliary variable, to discuss two forecasting issues in the fuzzy time series analysis by using One-and Two-factor models. First, disregarding the length of information period, when window basis is two, a better forecasting result is obtained. Second, the optimum number of partition equal intervals is to select 14 intervals to have the smallest MSE in all models. However, if partitioning the information into more than 14 equal intervals, MSE can not be reduced but presents a waving pattern.
Research and Development of Flash-Based Online Virtual Laboratory
Authors: Liang Wei Yan
Published: February 2014

Flash is an electronic animation that can be watched on a computer or monitor with a microprocessor. It is rich in content and can simultaneously display images, sound and text, its data is very few, generally speaking , the amount of data of an animated video accounts for 1/ 4 to 1/ 10 of a physical video with the same size and definition. Its development brings opportunities for modern educational technology curriculum of higher normal university, making it present a more rich content and form. The relevant overviews of online virtual laboratory are first discussed in this paper, and then is its construction process.
Construction of Stereoscopic Teaching Resources under the Support of Modern Information Technology
Authors: Liang Wei Yan
Published: February 2014

This paper started with the research on relevant background of the project, followed by a detailed analysis of the construction status and the problems existing in the teaching information resources of "Modern Educational Technology" in higher normal colleges and universities, and then the ideas and principles of constructing teaching information resources of "Modern Educational Technology" in higher normal colleges and universities were proposed, finally, it was proposed that information technology should be used to construct the overall framework and implementation processes of the teaching information resources of "Modern Educational Technology ".
LQG Controller Design for Heavy Vehicle Active Suspension Based on OT-AHP Method
Authors: Li Jin Hui , He Jie , Li Xu Hong
Published: February 2014

In order to develop more scientific LQG (Linear-Quadratic Gaussian) optimal controller of vehicle active suspension, based on vehicle systme dynamics and modern control theory, the LQG controller of one 4-dof active suspension vehicle model was presented. And the index weighting coefficiens in LQG controller were rationally determind by AHP (Analytic Hierarchy Process) method. Based on this, for furtherly improving vehicle performanc, the subjective important degrees in AHP method were optimized by OT (Othogonal Test) method which took the linear weighted sum of ride comfort and road friendliness index as the comprehensive performance evaluation index. The simulation results showed that, compared to AHP method, the LQG active suspension vehicle designed by OT-AHP (Orthogonal Test of Analytic Hierarchy Process) method could have better comprehensive performance, which could provide new ideas for the development of vehicle active suspension.
Energy-Saving Design of Villa Air-Conditioning System
Authors: Ma Rui Hua
Published: February 2014

Analysis on the energy-saving demand tendency of the current villa consumer groups to the air-conditioning system, propose one plan of VRV air-conditioning and cross-wind system, for a villa in Chongqing as an example, propose concrete implementation in the energy-saving, comfortable aspect, also expound the feasibility of the cross-wind system.
Research on Identifying and Avoiding Counterfeit Electronic Components
Authors: Chen Zheng Ping , Zhang Su Juan , Zhang Li
Published: February 2014

As the poor development of domestic semiconductor industry in China, the manufacturing of electronic equipments highly depends on the import of electronic components, especially monolithic integrated chips. Unfortunately, numerous counterfeit parts have been found in the supply chain because of the embargo, obsolete and other complicated reasons. Once these counterfeit electronic components were used, they can have devastating effects on the security and reliability of the electronic equipments. This paper analyses the reason of the emergence, source and types of counterfeit electronic components, and expound the method of identification and avoiding use of those counterfeit parts in the process of electronic equipments manufacturing, which is based on destructive physical analysis of electronic components and the database of basic characteristics information of imported electronic components.
Dynamic Torsional Response of a Pile Partially Embedded in Saturated Soil
Authors: Qin Rui Fu , Zhang Zhi Qing , Chen Rong Fa
Published: February 2014

The dynamic response of an elastic supporting pile partially embedded in a saturated soil and subjected to a time-harmonic torsional loading is investigated. At first, the pile is divided into two parts along the vertical direction, pile part above the soil and pile part embedded in the soil. Then, based on boundary and continuity conditions of the pile-soil system, the torsional impedance at the top end of the pile part embedded in the soil is obtained. By utilizing the transfer technique of impedance function, the admittance function of the pile top is defined in the frequency domain. By virtue of inverse Fourier transform and convolution theorem, a semi-analytical solution for the velocity response of a pile subjected to a semi-sine wave exciting torque is obtained in the time domain. Finally, selected numerical results are obtained to analyze the influence of main parameters on the torsional vibration characteristics of the pile.
Development and Application on Ultrahigh Speed Grinding Processing Technology
Authors: Yang Jian
Published: February 2014

Ultrahigh speed grinding technology is an advanced processing technology, which chould improve grinding efficiency, reduce surface roughness and improve processing quality. This paper introduces the origin of ultrahigh speed grinding processing technology, the development situation of ultrahigh speed grinding, summarizes its advantages comparing with the common grinding, analyzes the application on efficiency deep grinding, ultrahigh speed precision grinding, grinding hard materials grinding, grinding green and so on. And then it expounds the development trend of the ultrahigh speed grinding.
Impacts of Solder Voids on Power Devices' Thermal Characteristics
Authors: Zhang Xiao , Zhang Su Juan
Published: February 2014

Thermal performance is very important to power devices. Solder voids are detrimental to power devices thermal and reliability characteristics. According to above-mentioned problem, using computer software as an analysis tool, making some simulation and modeling on the influence of different solder voids distribution to power devices thermal characteristics. Focus on the solder voids around active region of power devices. Computing results show that solder voids under active region are the most evidently factor to power devices thermal characteristics and provide some suggests on the process of power devices thermal design.
Research on Five-Axis NC Machining Simulation for Four-Blade Propeller Based on UG&VERICUT
Authors: Wu Yan , Zhou Keng , Zheng Gang , Zhang Er Geng
Published: February 2014

This paper studies the five-axis NC machining simulation process for four-blade propeller. Three-dimensional solid model of four-blade propeller is created based on UG, and then the tool path is generated using its CAM module, and finally the machining simulation is implemented on FIDIA five-axis machining center based on VERICUT. The correctness of NC machining process is verified. The method of the virtual simulation is also suitable for similar parts machining.
Development of an Adaptive Layout Design System for ELV (End-of-Life Vehicle) Dismantling Plant
Authors: Sohn Young Tae , Park Myon Woong
Published: February 2014

In accordance with the increased awareness of resource depletion and environmental pollution, the importance of eco-friendly disposal and recycling of vehicles as a potentially valuable resource is emphasized; in particular, this is important as automobile production and demand continues steadily. In this paper, a systematic dismantling system is proposed to minimize the quantity of ASR by dismantling End-of-Life Vehicles (ELVs) rationally and efficiently. An adaptive layout design system is also provided to aid for the effective implementation of the proposed dismantling system to industrial applications. The proposed dismantling system is based on eco-friendly dismantling and improves not only the recyclability of ELVs, but also the efficiency of the dismantling operations. The adaptive layout design system is a software tool, which allows a layout of a dismantling plant according to the specific requirements of the customers, and estimates the overall figures and capacity of an intended plant by simulation of the dismantling process. This interactive design system can be useful for testing alternative layouts of a dismantling plant customized to meet particular recycling needs.
Different Strategies for Rapid Prototyping of Digital Bas-Reliefs
Authors: Carfagni Monica , Puggelli Luca
Published: February 2014

In the last decades several computer-based procedures have been devised with the aim of speeding up the 3D reconstruction from a single image in the form of bas-relief. At the same time, the use of rapid prototyping (RP) technology considerably spread enabling quick manufacture of 3D products directly from 3D modelling systems.
The present paper presents a few consideration about different possible strategies for bas-reliefs manufacturing by using the main RP techniques (stereolithography (SLA), selective laser sintering (SLS), fused deposition modeling (FDM) and Polyjet/Multi-jet technology). A practical example is used for discussing pros and cons of the different alternatives.
Experimental Investigation of Orifice Diameter, Swirl Generator and Conical Valve Shape to the Cooling Performance of Ranque-Hilsch Vortex Tube
Authors: Ismail Nurhasanah , Wisnoe Wirachman , Remeli Muhammad Fairuz
Published: February 2014

This paper is about experimental investigation of the orifice diameter, swirl generator and conical valve shape influence the cooling performance of Ranque-Hilsch vortex tube. From the experiment, its shows that conical valve shape has smallest effect on cooling performance (0.124) of the Ranque-Hilsch vortex tube. It also revealed that swirl generator gave the greatest (0.336) effects to the cooling performance of Ranque-Hilsch vortex tube and have the highest range of difference cooling performance (0.027 to 0.229) compare to conical valve shape (0.073 to 0.087) and orifice diameter (0.009 to 0.012).
Investigation on Indium-Silver Alloy Nanocrystal-Glass Composites with Enhanced Fluorescence
Authors: Yin De Wu , Pei Lang , Liu Zhen , Gao Wei Liang , Li Qi Ru , Yang Xin Yu , Zhang Xi Yan , Xiang Wei Dong
Published: February 2014

We demonstrated a model to realize the growth of indium-silver alloy nanocrystals in borosilicate glass by sol-gel method. The presence of spherical indium-silver alloy nanoparticles with 5 nm average grain size and finely dispersed form in borosilicate glass was confirmed by transmission electron microscopy imaging. Reduction of indium-silver ions to indium-silver alloy neutral nanoparticles was revealed through X-ray powder diffraction and X-ray photoelectron spectra. Remarkably, Indium-silver alloy nanocrystal-borosilicate glass exhibited fluorescence at around 423 nm.
Numerical Simulation for Feed-Oil Pump of Aero-Engine
Authors: Lu Ya Guo , Ren Guo Zhe , Hu Jian Ping
Published: February 2014

With reference to cavitation phenomena in the feed-oil pump of aero-engine, a numerical method is presented in this paper to analyze operating performance of pump. Local re-meshing model is introduced to update the computational mesh when the gear teeth in mesh depart each other. Also, the full cavitation model is applied to simulate the flow field, the mass transfer between oil and vapor at low pressure producing region. The performance of a typical feed-oil pump is predicted to evaluate the altitude influence. Results show that more oil vapor is produced at higher altitude. Meanwhile, the leakage mass is mainly depended on the pressure drop.
Numerical Simulation for Air/Oil Separator of Aero-Engine
Authors: Lu Ya Guo , Hu Jian Ping
Published: February 2014

Presently numerical simulation of separator is based on the assumption that all the droplets can be separated once they impinge the wall. However, large oil droplets may splash into small particles, which result in lower separation efficiency. A modified simulation model is presented in this paper to model the impact behavior of oil droplet. Some semi-empirical computational models are introduced to calculate the number and diameters of the secondary droplets. Then, the performance of a typical air/oil separator is predicted, including the separation efficiency and the minimum diameter. Results show that about the efficiency may reduce 1~2% due to the splash phenomena. While, no obvious difference is observed.
Design and Synthesis of a Novel Mesoporous Composite and its Performance as the Support for the Catalyst
Authors: Wang Wei Qiang , Zhang Hai Juan , Wu Ming , Zhang Shu Dong
Published: February 2014

A novel synthesis route for a MCM-41 structure with Y zeolite seeds colloidal has been developed. The route is different from conversational method of highly ordered MCM-41 assembled from Y zeolite seed colloidal. The material was characterized by various techniques. The results indicate that the material has well-ordered hexagonal structure, with a thicker wall than that of the sample synthesized by a direct hydrothermal route (N-MCM-41). Furthermore, it has a stronger acidity. The sample was used as the support of a Pd-Pt catalyst for the polyaromatics hydrogenation. It was demonstrated that the introduction of building units of Y zeolite enhances the activity of polyaromatics hydrogenation. It can be concluded that the pore structure and acidity of support is a key factor for the design of a sulfur-resistant noble metal catalyst for aromatics saturation of diesel.
Construction of Virtual Interactive Assembly System
Authors: Hu Pan , Jiang Lai
Published: February 2014

The paper give a method of construct a virtual interactive training system for assemble equipment based on virtual reality technology in which trainees can experience how to assemble equipments. A new, simple and quick software solution of "modeling software + programming language" is proposed to design the system. After the actual used by trainees, it show that the system has characteristics of good interaction and strong immersion, the process of assemble equipments is realistic, efficient and convenient. Achieved its purpose of assemble equipments training, and it is a preparation and supplement to assemble actual equipments.
The Design and Implementation of Substation Monitoring System Based on ZigBee Network
Authors: Wu Yun , Wu Yun , Zhou Yu Tong , Zuo Tong
Published: February 2014

ZigBee wireless network technology was introduced in traditional on-line monitoring system, and the wireless online monitoring function was realized in this paper. The system is mainly composed by ZigBee coordinator node and ZigBee sensor network. The network coordinator node is the control center, and its responsibilities are network maintenance and the data processing. The sensor terminal nodes are composed by a variety of sensors and ZigBee wireless module which distributed in monitoring area, and its responsibilities are the data acquisition and transmission. The innovations of this paper are the power supply mode and improving the efficiency. In this paper, the battery power and small CT power was combined for power supply, and the data fusion and the clustering routing algorithm was used to improve the efficiency.
Design and Development of the Third-Party E-Commerce Platform
Authors: Wang Tao , Zhu Xian Yue
Published: February 2014

This article proposed a design of the platform whose form of existence is intermediary. It constructs the core framework of platform aiming at development with the basic function of the electronic commerce as the basis of platform. It integrated each aspect of all kinds of electronic business model. The ultimate goal is to realize the each link of the whole value chain of enterprise throughout the platform for building a framework providing enterprise's comprehensive information service, third-party information service and foundation of constructing e-commerce platform.
Changes of Load Distribution on Cup-Bone Interface at the Different Positions of Non-Cemented Acetabular Cup
Authors: Li Dong Song , Li Shu Qiang , Cai Bo , Feng Wei , Liu Jian Guo
Published: February 2014

Objective To explore the relationship between acetabular cup position and the load distribution within the acetabulum and to confirm an optimal range of cup position, thereby providing a theoretical criterion from a biomechanical aspect for proper cup implantation in clinical work. Methods A male adult cadaveric pelvic was scanned with spiral CT, and then the two-dimensional images were evaluated using GE medical systems software and the outline of the pelvis was identified by the edge detective estimation. Pelvic coordinate data were put into the computer to build up a three-dimensional (3D) finite element model of the pelvic using Solidworks software . A φ48 non-cemented cup from Tianjin Huabei Medical Instrument Factory was used, and the 3D measurement of the cup was carried out by CLY single-arm 3D measurement apparatus, which was made in Testing Technology Institute of China. The measurement data were transferred into computer. Through the CAD Sliod Works 2010 software, the 3D model of the cup was automatically reconstructed. After wards, one-foot standing position was simulated to conduct the loading and constraint of the model, the Mises and shear force distributing of the cup were analyzed, forecasting the mechanical risk of prosthetic failure. Results In the 3D finite element model of human pelvis, the number of total nodes was 103043 and the number of total elements was 69271. Abduction angle did not affect the Mises and shear force distributions between the range of 40°-50°(P>0.05). However, significant affects appeared in Mises and shear force once the abduction angle was < 35° or > 50°. The change of the cup anteversion within5°-30°would not affect the Mises and shear forces in the acetabulum (P > 0.05). Conclusion A uniform load distribution on the cup-bone interface can be obtained when the cup abduction angle is from 40°to 50°. The change of the cup anteversion angle can not affect the load distribution in the acetabulum, therefore the cup abduction range of 40°-50°can be confirmed as the safe range for cup implantation.
Research on 3D Laser Texturing Technology of Mold
Authors: Xiao Yong Shan , Zhao Zhen Yu , Zhou Yong Quan
Published: February 2014

In the processing of the mold texture, the traditional chemical etching exits the shortcomings of the pollution and the long processing cycle. This article will introduce 3D laser processing technology to the mold industry, based on the laser etching principle on the metal surface, etch processing can be made in the mold surface. Through theoretical derivation from the 3D laser scanning optical system, the 3D laser scanning hardware system is structured to apply in the mold cavity texturing, the control algorithm has been studied, and finally in the developed laser-etch machine the texturing experimental is performed on the injection molds.
Three-Dimensional Finite Element Analysis of Un-Cemented and Cemented Femoral Prostheses Implanted under Different Bone Densities
Authors: Li Dong Song , Li Shu Qiang , Cai Bo , Feng Wei , Liu Jian Guo
Published: February 2014

Objective Three-dimensional finite element analysis was employed to select femoral prostheses according to different bone densities, and simultaneously simulated contrast mechanical tests were performed to determine the age criteria regarding the selection of femoral prosthesis during the hip replacement. Methods Three-dimensional finite element models of femur were established using Solidworks software. Following the known formula, the bone density and elastic modulus at different age brackets were calculated and input into the computer. The human one-foot standing condition was simulated and pressure was loaded on the reconstructed femoral models. Some iomechanical characteristics of un-cemented and cemented femoral prostheses, such as the distress distribution and initial micro-movement at different bone densities, were measured. Results Relatively well-distributed whole distress and slight initial micro-movement of un-cemented femoral prostheses were found in male patients at 30-60 years old and in female patients at 40-55 years old. Symptoms of cemented femoral prostheses the same as the un-cemented femoral prostheses were present in male patients at 60-70 years and in female patients older than 55 years old. Conclusion Results of three-dimensional finite element analysis and simulated contrast mechanical tests suggest that un-cemented femoral prostheses provide better therapeutic effects in male patients younger than 60 years and in female patients
A Study of Fire Resistance According to Boundary Condition of Ordinary Grade Structural Steels
Authors: Kwon In Kyu
Published: February 2014

Building construction has been developed with an increase of steel application at main members, but the weakness should be resolved with a proper fire resistance. The fire engineering method is regarded as an alternative way to evaluate the fire resistance with mechanical and thermal properties at high temperature. In this paper, the fire resistance of H-section built with ordinary grade structural steels such as SS 400 and SM 490 those are representative structural steels at the construction market were analyzed by the difference of boundary conditions. The study showed that the H-section made of SM 490 represented little difference in reduction ratio of an allowable stress at one hour standard fire curve. And the hinge to hinge boundary condition from both H-sections was the lowest. As the grade of structural steel rises, the difference in an allowable stress at high temperature according to grade of structural steels is inclined to increase.
Function Projective Synchronization in Complex Networks with Stochastic Effects via Hybrid Feedback Control
Authors: Jin Yun Guo , Zhong Shou Ming
Published: February 2014

In this paper, the problem of function projective synchronization is investigated for complex networks with stochastic effects. A hybrid feedback control method is designed to achieve function projective synchronization for the complex networks. Using Gronwally' inequality, we obtain some conditions to guarantee that the complex networks can realize mean square synchronization and mean square exponential synchronization, respectively.
Current Sensor Active Fault Tolerance Control Based on Feedback Gain Reconfiguration
Authors: Wang Zhi Qiang , Li Xiao Long , Wang Qing Zhen
Published: February 2014

For the failure of current sensor on maglev train, an active fault tolerance control strategy based on feedback gain reconfiguration is proposed. Fault diagnosis unit based on state observer is designed to detect the output of current sensor, the diagnosis result is used to switch the control strategy. Simulation result indicates that the fault tolerance strategy meets the demands of the system.
PI Terminal Sliding Mode Control of Theodolite Aiming Chaotic Motor with Time Varying Parameters
Authors: He Zhen Xin , Liu Chun Tong , Huang Xian Xiang , Li Bing
Published: February 2014

Parameters of theodolite measuring motor will vary with duty conditions bringing about aiming control system chaotic, which is harmful for the aiming system and the aiming result. In order to be close to reality, considering that the aiming system is under time-varying load and inside disturbances, the dynamic model was established and analyzed. The existence of chaos was proved. Due to terminal sliding control with good robustness, fast dynamic response, finite time convergence and high tracking precision, PI terminal sliding structure and control strategy were given, and the system stability was analyzed. The chaotic orbits of aiming motor system were stabilized to arbitrary chosen fixed points and periodic orbits by means of sliding mode method. Simulation results show that PI terminal sliding mode control can realize the stability and accuracy of aiming motor control system, and overcome the negative influence of the chaos for the aiming system.
Research on Control of Low Gravity Simulating System
Authors: Zhu Qi Dan , Chen Li Heng
Published: February 2014

In order to make the moon patrol car get the accurate test result, the active suspension method with controlling the force circuit directly is used. In the paper, the system model is established and delay time problem and the parameter uncertainty are dealt in it. To improve the control precision, location control is used on the basis of the force circuit and to solve the interference problems, the uncertainty and the time delay, the controller is designed. Through the simulation test, the controller has a good effect of the problems.
Research on Fuzzy Control Method of Hybrid Maglev System
Authors: Wang Qing Zhen , Hao A Ming , Wang Zhi Qiang
Published: February 2014

Combining with the principle of permanent magnetic and electromagnetic suspension, we can establish its mathematical model. Maglev system is a typical nonlinear system. Simulation model is built based on fuzzy control in matlab by combining the advantages of fuzzy control. By comparing the simulation results with PID, the simulation results show that fuzzy control can make the magnetic levitation system has better dynamic performance and steady-state performance.
Research on the Jet Flow Control Technology in LNG Liquid Charging Process
Authors: Yang Yun , Yang Gong Sheng , Jiang Jie , Zhu Wen Da , Li Bing , Wu Nan , Zhang Qing
Published: February 2014

Due to LNG liquid density is uneven, traditional LNG tank bottom discharge way produces layering and rolling phenomenon, in this paper, the way of charging LNG liquid in a circle is put forward. 30,000 square tank is taken as an example, the nozzle jet angle and nozzle number range are calculated. Through the selection of reasonable nozzle jet angle and nozzle number, the new charged LNG liquid flows circularly and mixes with original liquid automatically, the probability of layering and rolling phenomenon reduced greatly.
The Application of Temperature & Humidity Independent Control Air-Conditioning System Based on the Ground Source Heat Pump
Authors: Liu Jian Long , Xia Xiao Qian , Wang Han Qing , Liu Peng
Published: February 2014

The air-conditioning system is discussed in an office building of Yunlong demonstration area, located in the northwest of Zhuzhou city in Hunan province. The climate of Zhuzhou is subtropical monsoon climate and it is highly humid all the year, hot and humid in the summer. The air-conditioning system used the ground source heat pump is the cold and heat source of temperature and humidity independent control system, which has improved the efficiency of the energy use. And the use of the soil thermal energy has improved the energy efficiency of the system.
The Steady State Precision Control of DC Linear Motor Based on State Observer and Feedback
Authors: Zhang Shuai , Wang Hai Rui , Huang Jin , Liu He
Published: February 2014

This paper proposes a guarantee steady state observation precision and pole assignment precision of the feedback controller, the basic idea is to introduce state observer can easily get dc linear motor speed and acceleration condition, state space pole assignment can pass, select the appropriate zero pole can improve the control performance of the motor. Based on the observation of the gain matrix can compensate for the steady-state error of the dc linear motor. Based on the observation of the gain matrix can compensate for the steady-state error of the dc linear motor. Matlab simulation results show that the control algorithm is compared with the traditional pole assignment, it is able to quickly and accurately follow the speed of the motor. The system has better dynamic and steady-state performance, and its characteristic of the closed-loop system robustness is stronger.
The Application of Negative Feedback to Active Control in Vibration Isolation
Authors: She Tian Li , Gao Feng , Ma Shu Lin
Published: February 2014

Ultralow frequency vibration tables can easily be imposed external vibration interferences when they work. These interferences result to output distortion and the reduction of the calibration precision. A system with active vibration isolation control can effectively reduce the measure distortion. The principle of active control is the negative feedback method in vibration isolation. A composite feedback system was introduced that based on several different feedback variables. The frequency characteristic of the system was analysed. We simulated MATLAB at 0.1Hz and 1Hz. It is obvious that a better vibration isolation is effective by composite feedback system based on negative feedback method.
Second-Order Flocking Control with Communication Noise
Authors: Peng Huan Xin , Liu Bin , Wang Wen Kai
Published: February 2014

In the paper, we analyze the distributed flocking algorithms with communication noise. Under the Boid model, flocking algorithm with communication noise is easy to diverge. In order to improve the convergence performance of flocking algorithms with communication noise, and overcome the impact brought by communication noise on flocking algorithm, in the paper, a distributed flocking algorithm based on SO-DCT distributed consensus algorithm is proposed. The second-order flocking algorithm under the Boid model is analyzed, and simulations are done. Results show that the second-order distributed flocking algorithm can reach cohesion, and its convergence performance is better than that of the first-order distributed flocking algorithm, moreover, the impact of communication noise on the second-order flocking algorithm is smaller.
A Novel Sliding-Mode Observer for Doubly-Fed Induction Generator
Authors: Wang Qing Long , Tan Min , Yang Shu Ying
Published: February 2014

This paper proposes a novel sliding-mode model reference adaptive system (MRAS) observers for speed observer in a sensorless controlled doubly fed induction generator (DFIG) aligned with the stator flux. In the strategy, two stator flux models with different structure are used. The stator flux voltage model without including rotor position item is used as reference model, and the stator flux current model including rotor position item as adjustable model. A slide-mode surface is formulated from the errors between the two models, and the rotor speed estimation can be obtained by a sliding mode algorithm. Meanwhile the one order inertial link is used to avoid suffering from integrator drift effects in voltage model. Simulation results confirm the validity of the approach.