bluuebunny/crossref_metadata_2025 huggingface dataset:
Prediction of Unsteady Flow around a Square Cylinder Using RANS
Authors: Xu Fu You , Ying Xu Yong , Zhang Zhe
Published: March 2011

The results of unsteady Reynolds averaged Navier-Stokes (URANS) simulations of flow around a square cylinder using two-dimensional hybrid meshes were presented in this paper. The first part examined the accuracy of various RANS turbulence models, i.e. the standard model, RNG model, realizable model, standard model, SST model, and RSM, by comparing their results with available experimental data. Despite the limits imposed by the RANS approach and the relatively inexpensive two-dimensional computations, the main features of this complex flow can be predicted reasonably well. Among the computations using various RANS models compared here, the SST model shows the best agreement with the experiment. The second part investigated the effects of corner cutoffs on unsteady flow characteristics around a square cylinder by using the SST model. Especially the detailed near-surface flow structure around the cylinder was focused on, aiming at giving an explanation for the drastic modification of the aerodynamic characteristics as the corner shape is slightly changed.
Thermal Characteristics Finite Element Analysis and Temperature Rise Experiment for High Speed Motorized Spindle
Authors: Wen Huai Xing , Wang Mei Yan
Published: March 2011

The thermal characteristics of the motorized spindle determines maching qualities and cutting capabilities, and is one of the important factors influencing the precision of the high speed NC machine tool. To improve the performance of the high speed machine tool, it is important to study the thermal characteristics of the motorized spindle. It had been studied in two ways: one is finite element analysis by Ansys software, in which the finite element analysis model was built. According to the actual working condition, the heat source and the heat transfer coefficient of every part are calculated. On this basis, the temperature field and temperature rises were gotten in Ansys software. The other way is temperature rises experiment on the motorized spindle test platform. The result was shown in the form of curve. These two ways shown the same result: the highest temperature rise appears in the area of electromotor, then followed by the rolling bearing .The result provides the necessary theory basis for optimizing the structure of the motorized spindle and establishes a basis for the research and application about the high speed spindle.
Blow-Up of the Solution for some Higher Order Hyperbolic and Neutral Evolution Systems
Authors: Chen Ning , Chen Ji Qian
Published: March 2011

In this paper, we give some results on the blow-up behaviors of the solution to the mixed problem for some higher-order nonlinear hyperbolic and parabolic evolution equation in finite time. By introducing the “ blow-up factor ’’, we get some new conclusions, which generalize some results [4]-[5] , [6] .
Modeling Corrosion Property of High Vanadium High Speed Steel (HVHSS) under H3PO4 Medium Condition Using Artificial Neural Network
Authors: Xu Liu Jie , Zhang Song Min , Wei Shi Zhong
Published: March 2011

The components in slurry pump suffer serious corrosion abrasion under H3PO4 medium. Presently, High chromium cast irons are often used to produce the components in slurry pump. New high vanadium high speed steel(HVHSS) has been proved to be a more excellent wear resistance material than high chromium cast irons under abrasive wear and rolling wear. In order to apply HVHSS in slurry pump to replace high chromium cast irons, the corrosion properties of HVHSS were tested under different H3PO4 medium concentration conditions. Using back-propagation (BP) neural network, the non-linear relationship between the corrosion weight losses (W) and H3PO4 concentration, corrosion time (C, t) is established on the base of the dealing with experimental data. The results show that the well-trained BP neural network can predict the wear weight loss precisely according to H3PO4 concentration and corrosion time. The prediction results reveal that the corrosion time and H3PO4 concentration have obvious effect on corrosion weight loss of HVHSS. And corrosion weight loss takes on linear relationship with corrosion time and H3PO4 concentration, respectively.
Three-Dimensional Electromechanical Impedance Model for Damaged Beams with Imperfectly Bonded Piezoelectric Patches
Authors: Li Wan Chun , Yan Wei , Wang Wei
Published: March 2011

Dynamic analysis is conducted for a cracked beam with imperfectly bonded piezoelectric patches using the finite element method in the paper. The property of adhesive between the PZT patches and the host beam is taken into account based on the peel stress model as well as the shear lag model and thus the three-dimensional (3D) model of piezoelectric patch-adhesive-host beam coupled system is developed. Based on the established three-dimensional EMI model, the effect of some physical parameters such as vibration mode of main structure, the mass of adhesive layer and crack depth etc. on electromechanical impedance signatures is investigated. Finally, the root-mean-square deviation (RMSD), a kind of non-parametric damage index, is also employed to identify the damage severity of the cracked beam.
Integration Infrastructure of Token-Based Industrial WSN and TCP
Authors: Hou Wei Yan , Qin Zhao Hui , Wang Hai Kuan
Published: March 2011

As some prevalent wired networks in industrial field are based on TCP, we proposed a novel integration infrastructure of token-based industrial WSN protocol and TCP, so as to make the application of wireless communication technologies more flexible. In the paper, a protocol conversion infrastructure is presented, which is based on data mapping mechanism. The protocol converter includes two modules: Wireless Industrial Control Network(WICN) master module and TCP host module. WICN master module owns an exclusive data buffer called WICN data buffer. TCP host module also has its own data buffer which is named TCP data buffer. A public data area is used for realizing the data mapping between WICN data buffer and TCP data buffer. By the data mapping mechanism, a station in wired network segment could get the data from WICN by accessing TCP data buffer, and WICN slave station could get the data from wired network via WICN data buffer. By the protocol conversion mechanism based on data mapping, flexible data exchange of heterogeneous networks could be realized.
Concerning Industrial Products of "Valuable" Streamline Design
Authors: Guo Xiao Yan , Cao Yu Hua , Xiong Wei , Xu Ning
Published: March 2011

Because consider aerodynamics and make its modelling tends to streamline in the car design, this article mainly describes streamline design for product create better use of convenience for the product brings outside the modelling and mental and emotional intangible value, this also is industrial design create products value-added effective means recently, Ultimately this article give some suggestions to designers to put forward some reasonable use of streamline design.
Text and Hulling Prosess Analyse to Key Parts on Castor Capsule Machine
Authors: Cao Yu Hua , Guo Xiao Yan , Qin Yan Mei , Gao Rui Tao
Published: March 2011

In traditional hulling machine, The lower of shelling rate and higher of breakage rate of castor. The self-designed hulling machine is adopted in this issue to study the prosess of capsule hulling. By analyzing the state, As gap between rollers reaches the minimum space, distortion from capsule to roller surface reaches the maximum, as the same as both the pressure of roller surface on castor-oil plants P and friction force F which indicates the strongest effect of extrusion and rubbing. the required condition of capsule rolling is that the angel of rolling（ ） should be no larger than frictional angel of roller（ ）. The highest shelling rate and lowest of breakage rate can be gained by using a steel matrix roller coated by plastic with 10r/min rotation rate of rollers and 18mm gap between rollers.
Optimal Design of Special Fixture for Micro High Speed Motorized Spindle
Authors: Lu Xiao Hong , Jia Xu , Jia Zhen Yuan
Published: March 2011

The fixture of motorized spindle plays a definitive role in clamping stability and working reliability. If designed irrationally, not only will affect the precision of the micro-milling machines, but also cause the spindle drop. Based on the phenomenon that the spindle drops at high-speed in micro-milling process, this paper optimized the existing fixture, designed the supporting protective device, and analyzed their static characteristics utilizing ANSYS finite element analysis software. To guarantee the sufficient strength of bolts on the fixture and the protective device, both the theory analysis method and ANSYS finite element analysis method are used to make the strength check of the selected bolts. The optimization of the fixture for high speed motorized spindle has far-reaching affect on the design of high-speed motorized spindle.
Computation of Mixed Mode Stress Intensity Factor for Parallel Edge Cracks
Authors: Daud Ruslizam , Ariffin Ahmad Kamal , Abdullah Shahrum , Ismail A.E.
Published: March 2011

This paper presents the extensions of newly developed finite element (FE) formulation to evaluate fracture behavior of parallel edge cracks problems. The numerical formulation used Barsoum singular finite elements to compute fracture parameters in two dimensional finite element models subjected to different crack-width ratio and cracks interval ratio. Mixed mode stress intensity factors (SIFs) of parallel edge cracks are computed in extending of FE formulation for pure Mode I formulation proposed by authors. In 2D linear elastic problem under mixed mode condition, the variation of SIF value near crack tips are discussed comprehensively. The newly finite element formulations are resulted with remarkable agreement with energy release rate based method compared to analytical solution available in the literatures.
Effect of the Environment Factors on KGM Molecular Dimension
Authors: Wang Chao , Xu Mei , Zhu Yu Peng , Qiao Yu , Cai Lin Lin
Published: March 2011

In this paper, the effect of environment factors on KGM molecular dimension was discussed, such as ultrasonic, enzyme, concentration and temperature. The KGM polarity, molecular weight (Mw) and conformation were analyzed by digital polarimeter and LLS. The result indicated that the polarity change influenced by temperature and ultrasonic accorded with linear function equation. Mw of KGM gradually decreased with ultrasonic time and concentration of enzyme increase. The concentration of KGM was lower, the effect was more obviously. The changes of KGM Mw also brought regular change of molecular conformation. All offers the reference to reliabletheoretical foundations on controlling KGM molecular dimension and industrial application in exploiting KGM potential function and activity.
Study on Molecule Dimension of Different Granularity Konjac Glucomannan
Authors: Wang Chao , Zhu Yu Peng , Xu Mei , Li Dong Sheng , Huang Hong Xia
Published: March 2011

In this paper, the relativity on the granularity with different mesh of konjac glucomannan (KGM) and molecular dimension was discussed. Laser particle size analyzer, laser light scattering and digital polarimeter were used to analyze the granularity distribution, molecular characteristics and polarity of KGM. The results showed that the granularity of KGM after gradient refining was gradually decreased and KGM was well dispersed in ethanol(D50=13.11μm).The Mw of KGM was gradually decreased with its granularity decrease and its molecular conformation was from globular to linear structure. The space asymmetry of KGM at 80-100 meshes was minimum and its polarity was maximum. The primary establishment on the relativity offered the references to KGM theoretical research and practical application.
High-Lift Aerodynamics Design for Large Civil Aircraft in Fudan University
Authors: Sun Gang , Xu Kang Le , Chen Ying Chun
Published: March 2011

Part of work on CFD simulations by the high-lift system design team in Fudan university for large civil aircraft is presented. The research on CFD simulation of the high-lift systems and some concepts and experience in three-dimensional geometry modeling are also presented, which are done on the self-developed platform of high-lift device aerodynamic calculation software and programs. For which, the design efficiency is substantially improved.
Triangulation Method of 3D Scattered Data Points Based on CAD Model
Authors: Chen Shao Ke , Chen Hui Qun
Published: March 2011

A new method of triangulation for large scale scattered 3D points is proposed. This method is based on the available CAD model, with the thought of DC(divide and conquer).Alignment between the data and the CAD model, registration which establishes correspondence between the data points and those on the CAD trimmed NURBS surface entities;2D-Delaunay triangulation, performed on the corresponding points in the parametric domains(u, v)of each entity, application of the connectivity structure to the 3D data points for each mesh patch; Elimination of redundant triangles of each 3D mesh patch and stitching of patches together. Unlike many other methods, it is not constrained by certain types of measurement distribution or object shape. The experimental results testify that the approach is feasible and efficient.
CCT Curves and Dynamic Phase Diagrams of Steel
Authors: Zou Qing Hua
Published: March 2011

TheCCT curves and dynamic phase diagrams of carbon steel have been established and discussed, the corresponding structures and chemical compositions are analyzed. The computer calculation programming of phase diagram and main computer program have been setted.
Effect and Analysis of Fit Clearance between Mandrel and Workpiece on the Spinning Stability of Barrel with Extra Thin-Wall and Height Diameter/Thickness Ratio
Authors: Li Xin He , Yan Yue Sheng , Deng Rui
Published: March 2011

After 4 times thinning spinning, the C-276 tube with 2mm thickness and 561.5mm diameter was thinned to 0.42mm, the length was extended from 300mm to 1200mm. Discuss the problem of drum instability during the process of spinning, as well as the effect of fit clearance between mandrel and workpiece on the spinning stability. Applied the large-scale finite element software MSC.MARC to carry on the simulation analysis of the drum instability phenomena of loading workpiece under the condition of different fit clearance, put forwards measures to control the instability, so as to provide theory instruction for producing barrel with extra thin-wall and height diameter/thickness ratio which can fit the precision requirement.
Neural Network and Data Mining Method in Aerodynamic Optimization
Authors: Jin Xin , Sun Gang , Liu Chun Juan
Published: March 2011

This document focuses on the case that optimization direction is hard to determine in aerodynamic optimization processes, and proposes an intelligent approach based on ANN learning, followed by result visualization using data mining technology. It can not only help visualize the optimization process (qualitative analysis), but also determine the optimization direction (quantitative calculation), which can save time of frequent CFD calculation and obviously improve efficiency in aerodynamic optimization.
Research on Fault Diagnosis Method of FCV Power Battery Based on Physical Model
Authors: Yun Xiong , Zhong Zai Min , Sun Ze Chang , Zhang Tong , Yin Ting Ting
Published: March 2011

Fuel cell vehicle powertrain is a complex electromechanical system related to electrochemistry, power electronics, power transmission and control systems, network and communications and other disciplines. Therefore, this article has clearly made the concept of fault and fault diagnosis, and conducted the preliminary study of the method of fault diagnosis for the fuel cell vehicle battery, and will adopt the model-based fault diagnosis method to achieve battery fault diagnosis.
Research on the Performance Influence of the Flow Metering in the Natural Gas Pipeline with the Remit Pipe
Authors: Zhang Yong Xue , Shi Zhi Cheng , Liu Chang , Guo Chan
Published: March 2011

The flow measurement of the natural gas directly influences the economic benefit, which includes development, operation, allotment and the utilization in the industry of the natural gas. Moreover the structure of the pipeline is the main factor for the accuracy of the flow metering. In this paper, the research on the internal flow field of various kinds of pipe structure with the remit pipe, which are the different inflows and whether equipped with the panel rectifier separately, is done with the method of the numerical simulation and the experiment. The conclusion shows that the desire length to recover the full development turbulence section in the downstream of the remit pipe is most in the pipe structure with the stagger inlet-outlet and no rectifier. While that in the pipe structure with the opposite inlet-outlet and with a rectifier reaches the least. It can be got that the most appropriate installation site of the flow meter and the design of the pipe structure of the natural gas from the research on the influence pattern of the gas flow field.
Structural Optimization of Large Part of Machine Tools Based on BP Neural Network
Authors: Zhao Hong Lin , Chen Shi Guang , Li Wei Hua , Zhang Guang Peng , Wu Zhi Heng , Wang Qing Fu
Published: March 2011

A design method of structural optimization of large part of machine tools was proposed based on neural network and finite element method. With the pillar of XK713B numerically-controlled boring and milling machine as an example, the BP neural network model corresponding to structure parameters and dynamic characteristics of the pillar was built, and rapid sampling of the neural network model was carried out with the help of APDL language. Then, optimization of the design variables was done and satisfied results were obtained. Calculation results show that, by using the neural network model, error between calculation results and expectations is less than 5%.
Research on Machine Tool Components Contribution Calculation and the Weak Link Identification of the Whole Machine
Authors: Zhao Hong Lin , Wang Qing Fu , Li Wei Hua , Zhang Guang Peng , Wu Zhi Heng , Gao Bo , Chen Shi Guang
Published: March 2011

After modeling and calculating of whole machine, the static and dynamic characteristics are obtained, since it is difficult not only to judge out machine components’ influence on machining precision intuitively , but also to identify the weak link of the whole machine. Therefore, through extracting key nodes coordinates of machine components and deformation information of finite element software calculated, we brought forward a space vector transfer algorithm, calculated the contribution of components for tools and work piece system and expressed impact of machine components on tool and work piece system by histogram. By this means ,we can judge out the whole machine’s weak links intuitively. Take XK713B Vertical Milling Machine as the case research object, extract key nodes and their deformation information of general structure such as lathe bed , column, headstock, sliding table, workbench etc. By using space vector transfer algorithm, the result shows that the largest contribution to tool system and workbench system is column, which is the weakest link in the whole machine and its vibration type is swing. According to this, further optimize design of column can be proceed.
Hydrodynamic Characteristics of Dislocated Floating Ring Bearing with Different Eccentricities
Authors: Dai Yu Jie
Published: March 2011

For obtain the effect of floating ring radius R2 and floating ring velocity v2 on internal friction in dislocated floating ring with different eccentricities, the evolution of internal friction is simulated with boundary element method (BEM). Numerical simulation results show that internal friction increases with the increase of eccentricity. Internal friction rises linearly as the addition of floating ring velocity v2 if the eccentricity e and radius R2 are fixed. When the velocity v2 is a constant and the range of R2 is 0.75<R2<0.8, the internal friction increase enormously.
Study on the Turing of Toric Spectacle Lens by Use of Slow Tool Servo Method
Authors: Kang Min , Wang Xing Sheng , Yang Yong , Zheng Xu
Published: March 2011

To solve the difficulties in machining toric spectacle lens, the turning method with slow tool servo was discussed. First, the experimental setup was developed, which have X-axis, Z-axis and C-axis, and the movement of the three axes can be simultaneously controlled by numerical control system. Then, the mathematical model of toric was established, and its machining model was analyzed and simulated. Finally, the machining experiments were carried in the experimental setup. The experiments showed that the turning method based on slow tool servo can meet the requirements for machining the toric spectacle lens.
The Dynamic Response of a Rotating Thick Piezoelectric Plate with Thermal Relaxations
Authors: Li Hui Min , Wang Ying Mei , Wang Bing Yao , He Tian Hu
Published: March 2011

Based on the generalized thermoelastic theory postulated by Green and Lindsay(G-L), the dynamic response of an infinite rotating piezoelectric plate subject to thermal shocks on both up and bottom surfaces was investigated. To avoid the calculation precision loss caused by the integral transform technique, the so-called direct finite element method was used to solve the governing equations in time domain directly. The distributions of the dimensionless temperature, stress, displacement and electric potential were presented graphically. The results show that the direct finite element method provides an effective way for achieving high calculation precision in solving the generalized piezoelectric-thermoelastic problem. The results also show that the rotation effect tends to decrease the dimensionless displacement and electric potential and barely affects the dimensionless temperature and stress.
Digital Modeling and Key Parts Simulation of Rubber-Bar Roller Cotton Harvester
Authors: Zhang Hong Wen , Kang Min , Wu Jie
Published: March 2011

Based on the characteristics of parameterized modeling technology, digital solid modeling of the parts of rubber-bar roller cotton harvester and virtual assembly of rubber-bar roller cotton-picking machine were established, The motion parameters curve of key parts were analyzed by dynamic simulating method. The results showed that cotton-picking machine could achieve high collect rate of cotton and low impurity rate at the 400-450 RPM and 0.83 m/s of working speed.
The Design and Research of Automatic Tracing Intelligent Vehicle Control System
Authors: Wang Li Jun , Huang Yong Liang , Ma Li Li
Published: March 2011

A kind of design scheme of intelligent vehicle control system based on infrared photoelectric sensor is introduced in this paper.The Freescale 16-bit single chip MC9S12DG128B is used as controller, 13 infrared photoelectric sensors are used for acquiring path information and the PID controll is used for steering control in the system. All these ensure the intelligent vehicle’s independent tracing. To improve the system stability and response speed, a suppressing interference method based on software and a simple and effective filter interference scheme based on hardware are put forward.
Investigation of Ni-YSZ Composite Manufactured by Electroless Ni Coating
Authors: Baba Nor Bahiyah , Davidson Alan , Muneer Tariq
Published: March 2011

Nickel ceramic composite has becoming highly important in mechanical engineering perspective. The paper focused on a newly developed Ni-YSZ composite manufactured by electroless nickel coating. The aims are to ensure good coating with well distributed and high ceramic particle co-deposition. Low metal to ceramic ratio increases nickel ceramic composite resistance to corrosion, wear and thermal. The 2k full factorials design of experiment was used in determining the best EN composite process parameters for high ceramic co-deposition. The composite surface microstructure and characterisation were analysed using scanning electron microscope (SEM) and the Ni composition was measured by SEM coupled with energy dispersive X-ray (EDX).
Influence of Carbon-Protection-Film to Deterioration of Electrode in EDM
Authors: Zhao Wei , Zhu Qing Gong
Published: March 2011

In this paper, process of how carbon-protection-film is formed and dynamic influence process of carbon-protection-film to electrode erosion are discussed in limited continuous pulse discharge. It is considered that the compensation of carbon-protection-film to anode erosion results in the cathode erosion bigger than that of the anode under long time EDM.
Preparation Technology of the Low Carbon High Boron Fe-C-B Wear Resistance Steel
Authors: Li Ji Wen , Zhang Guo Shang , Wei Shi Zhong , Zhao Qing
Published: March 2011

The solidified microstructure and the modified treatment have been systematic studied for the low carbon high boron Fe-C-B steel. The cast solidified microstructures of the low carbon high boron steel are consisted of the matrix and the boride phases. The matrix phase is consisted of the ferrite, pearlite and a few martensite phases. The boride phases of the hypoeutectic steel are based mainly on the Fe2B phase. With the increasing of the boron content, the Fe2B phase is decreased. When the boron content is excess 2.6wt.%, the boride phases are changed from the single Fe2B phase to the compound structures. Meanwell, the morphologies of the boride phases are transformed from the long strip-shaped and the fish-bone reticular structure to the rosette type. The boride phases of the eutectic steel are mainly the M2B phase. However, for the hypereutectic steel, it are composed of the M23(C, B)6 and B0.7Fe3C0.3 phases. The suitable modifier for the hypoeutectic low carbon high boron steel is the compound modifier 0.2%RE+0.2%Ti. After modified, the reticular boride phases are disconnected. Moreover, there existed some of isolated massive borides. The appropriate modifier for the hypereutectic steel is the compound modifier 0.9%Nb+0.4%RE. After modified, the primary borides are fine refined and tend to round.
Study on Elastohydrodynamic Lubrication of Transmission Gear in Fuel Cell Bus
Authors: Chang Qiu Ying , Liu Qing , Yang He
Published: March 2011

The model of thermoelastohydrodynamic (TEHL) analysis of a transmission gear in a fuel cell bus was developed. The influence of rotating speed on the frictional pair was investigated numerically on the base of the mathematical model. The pressure field, the temperature field, the oil film thickness were calculated under different rotating speeds. It is shown that the worst lubrication in the tooth root occurs and the minimum film thickness increases with growth of the rotating speed. The temperature of lubricant is up to 140oC at 4000rpm.
The Research of Modified Carbon Fiber Polymer-Matrix Composites Properties of the Mechanism of Piezoresistivity
Authors: Lv Yong , Zhu Si Rong , Li Zhuo Qiu , Fang Xi
Published: March 2011

At present, the study of smart composite material of carbon fiber is mainly focused on the usage of the material pressure-resistant effect. The change of resistance reflects the force status of the structure and its performance mainly depends on the sensitivity of pressure-resistantance. Such composite’s sensitivity has a relationship with the sample preparation process. In this paper, the resin-based carbon fiber is improved so as to obtain a high sensitivity and good stability bundle of modified carbon fiber polymer-matrix composites. Clamp the samples of this material on the micro-tensile test table, the characteristics of mechanism pressure-resistant is analyzed by observing the fiber interface changes through SEM when loaded, combined with monotonic loading curve of the sample. With the electrical model of parallel circuit and normal distribution model and Weibull model, piezoresistivity model is established. Compared with the model curve and the experimental model, the mode is verified being a high accuracy.
Effect of Target Power on Structure and Mechanical Properties of Nanocrystalline ZrN Coatings
Authors: Zhu Fang Ping , Qi Zheng Bing , Wang Zhou Cheng , Wu Chong Hu
Published: March 2011

Nanocrystallized ZrN coatings have been deposited by DC magnetron sputtering. The effects of target power on the microstructure and mechanical properties of ZrN coatings have been investigated. X-ray diffraction, scanning electron microscope and nano-indentation were applied to characterize the phase structure, morphologies of cross-section and mechanical properties of ZrN coatings. As power increases up to 250 W, ZrN coating exhibits (111) preferred orientation. All coatings showed columnar structure, and the columnar width increased with improved power. These microstructural changes resulted in the increase in hardness with increasing target power.
Improved Adaptive Control of SMA Actuator Based on Inverse Hysteresis Compensation
Authors: Luo Hong Yan , Yang Qing Yun , Abel Eric , Wang Zhi Gang , Liao Yan Jian
Published: March 2011

Shape memory alloys have become the most promising construction material for smart actuators in diverse applications. However, their highly nonlinear hysteresis behaviour sets the main barriers in precise motion control. This paper presents an adaptive MKP control scheme based on a feed-forward compensator using the inverse of the modified KP model and the selective parameter adaptation law, to realize dynamic hysteresis compensation for real-time applications. The performance of the proposed control scheme was evaluated experimentally. The results indicate that such an improved adaptive control scheme is characterized by the reduced computation, rapid parameter convergence and effective hysteresis linearization.
A Model for Measuring the Aggregative Risk Degree of Implementing RFID Campus-Safety Systems
Authors: Hsu Shu Chen , Wang Tien Chin , Wu Chao Yen , Li Li
Published: March 2011

When the school decides to implement the RFID campus-safety system, the administrators always encounter internal and external risk items or difficulties which they know even they don’t know. This study therefore proposes an analytic hierarchy model to help the administrators understand the critical risk factors influence the RFID campus-safety system initiation, and an aggregative risk degree is indicated which risk grade they are in. The importance weights of risk factors and possible occurrence ratings of four risk grade (high-risk, medium-risk, low-risk and none-risk) are determined by using consistent fuzzy preference relations. The relative priority weights of evaluators are taken into consideration at the same time and obtained by simple additive weighting method. By multiplying the importance weights of risk factors, possible occurrence ratings of risk grades and the relative priority weights of evaluators, the aggregative risk degree of implementing RFID campus-safety system.
FEM Simulation of Continuously Variable Transmission (CVT) with Built in Gear Hub Type for Bicycles
Authors: Baek Seung Yub , Kong Jung Shik , Kim Hyung Seop
Published: March 2011

The two kinds of bicycles of the power transmission types are derailleur type and built in gear hub type. Derailleur type is a simple structure but it is vulnerable to external contamination and impact. And it is impossible to shift from the quiescent state. Built in gear hub type is very strong about the external contamination and impact because working part did not expose to the outside. In this paper, a new design of a continuously variable transmission with built in gear hub type for bicycles was developed and simulated. Stress and displacement analysis in built in gear hub by using finite element method were performed in order to develop improved structure of CVT.
Effect of Calcinations on Morphology of Electrospun Copper and Copper Oxide Nanofibers
Authors: Khadem Dariush Jafar , Yaakob Zahira , Shahgaldi Samaneh , Wan Daud Wan Ramli , Majlan Edy Herianto
Published: March 2011

Metal and Metal oxide nanofibers have different potential to play an essential role in a series of application, among them copper and copper oxide nanostructures is a promising semiconductor material with potential applications in many field. In this paper, electrospinning method via sol-gel was used to fabricate copper and copper oxide nanofibers. Synthesize of copper and copper oxide nanofibers and also effect of calcinations temperature on morphology investigated by thermal gravimetric analysis, scanning electron microscopy (SEM), Transmission electron microscopy, x-ray diffraction(XRD), Fourier transform infrared spectroscopy (FTIR) and Brunauer Emmett and Teller (BET).
Error Compensation of a NC Machining System Based on a Dynamic Feedback Neural Network
Authors: Zeng Huang Lin , Sun Yong , Ren Xiao Hong , Liu Li Xin
Published: March 2011

Machining error of a NC machining system is a kind of comprehensive error in dynamically machining process; especially it is of errors with non-linear characteristics. In this paper, we will set up a kind of model of comprehensive errors analysis for a NC machining system and present an error compensation for high-precision a NC machining system by a dynamic feedback neural network embedded in a NC machine tool. The results obtained shows that this approach can effectively improve compensation precision and real time of error compensation on machine tools.
Similarity Solutions of the MHD Stagnation-Point Flow over a Power-Law Stretching Sheet
Authors: Zhu Jing , Zheng Lian Cun , Chen Xue Hui
Published: March 2011

A similarity analysis is performed for a steady laminar boundary layer stagnation-point flow of an electrically conducting fluid in a porous medium subject to a transverse non-uniform magnetic field past a non-linear stretching sheet. A scaling group of transformations is applied to get the invariants. Using the invariants, a third order ordinary differential equation corresponding to the momentum is obtained. We show the existence and uniqueness of convex and concave solutions for the power law exponent, according to the values of magnetic parameter, permeability parameter and velocity ratio parameter.
Knowledge Acquisition in Production Decision Making Based on Interactive Simulation
Authors: Zhang Xiao Dong , Li Ying Zi , Zhao Can Can , Yu Tian
Published: March 2011

In order to acquire high-quality knowledge used in production decision expert systems, a production decision knowledge acquisition method based on interactive simulation was proposed. Key technologies of interactive simulation modeling and expert decision data evaluating were studied in detail. Taking the line switching decision of a motor engine production line as an example, the method was practiced and validated. The case study shows that the data acquisition method based on interactive simulation can effectively optimize the production performance.
Adaptive Hysteresis Band Current Control (AHB) with PLL of Grid Side Converter-Based Wind Power Generation System
Authors: Guo You Gui , Zeng Ping , Li Li Juan , Zhu Jie Qiong , Deng Wen Lang , Blaabjerg Frede
Published: March 2011

Adaptive hysteresis band current control(AHB CC) is used to control the three-phase grid currents by means of grid side converter in wind power generation system in this paper. AHB has reached the good purpose with PLL (Lock phase loop). First the mathematical models of each part are given. Then the control strategy of grid side converter-based wind power generation system is given in detail mainly including ABH CC and PI controllers of DC-link voltage, active power, reactive power. Finally the simulation model is set up which consists of power circuits, such as the grid side converter, LCL filter, transformer and grid, and control parts, etc. The simulation results have verified that the control strategy is feasible to fit for control of gird currents, active power, reactive power and DC-link voltage in wind power generation system.
Modeling and Control of Grid Side Converter in Wind Power Generation System Based on Synchronous VFDPC with PLL
Authors: Guo You Gui , Zeng Ping , Li Li Juan , Zhu Jie Qiong , Deng Wen Lang , Blaabjerg Frede
Published: March 2011

Virtual flux oriented direct power control (VFDPC) is combined space vector modulation (SVM) with PI of DC-link voltage, active power and reactive power to control the grid side converter in wind power generation system in this paper. VFDPC has reached good performances with PLL (phase lock loop). First the mathematical models of grid side converter, LCL filter and phase lock loop are given. Then the control strategy of grid side converter-based wind power generation system is given in detail. Finally the simulation model is modeled consisting of power circuits, such as the grid side converter, LCL filter, transformer grid, and control parts, such as PI controllers of DC-link voltage, active power, reactive power, and SVM, and so on. The simulation results have verified that the control strategy is feasible to fit for control of gird currents, active power, reactive power and DC-link voltage in wind power generation system.
A Constitutive Description for Shape Memory Alloys with Phase Transformation Microstructure
Authors: Li Wei Guo , Peng Xiang He , Pi Wen Li
Published: March 2011

An incremental form of constitutive model is proposed for shape memory alloys using the modified strain based on experimental results and the finite element analysis, taking into account of the laminar microstructure, the thickness of martensite phase lamina and the interaction between the two phases. The pseudoelastisity of NiTi shape memory alloy micro-tube subjected to pure tension and pure torsion are analyzed and compared with the experimental results respectively. It can be seen that the pseudoelastic behavior, especially the stress drop during tension processes, can be well described with the proposed model.
Research on Low Carbon City Development
Authors: Chen Yu Xing
Published: March 2011

Globalization has always been controversial, but the overwhelming trend has become a fact of life. Globalization has emerged and penetrated in each field of human social life, the development of the city is no exception. On the analysis of urban development under the background of globalization for the appeal of low carbon mode, we initially proposed the possible paths of low carbon economy for urban development.
An Automation Fuzzy Switching Bang-Bang Controller for Industrial Applications
Authors: Chen Hao
Published: March 2011

In this paper, a fuzzy switching bang-bang controller-based theoretical bang-bang was designed and implemented in the laboratory and its effectiveness in tracking application has been verified. The key advantage is the ease of the design and flexibility. The ability of the fuzzy bang-bang controller to achieve the tracking process with a high degree of accuracy, even in the presence of external disturbance was illustrated. The sensitivity of the proposed controller to rapid load changes in the external load was verified, and very promising results were observed. Experimental results confirmed the effectiveness of the proposed controller in position tracking and robustness to system parameter variations. The fuzzy switching bang-bang controller showed definite promise for this application due to the ability to combine many control laws together in a simple, intuitive manner.
Algorithm for Real-Time AI-Based PI Controller in PMSM
Authors: Hoo Choon Lih , Haris Sallehuddin Mohamed
Published: March 2011

Motor control is essential for good performance especially now the servo and speed drives application has gaining much attention. Proportional-integral controller is popular among motor control but yet is mostly with preset control parameter. The proposed real-time artificial intelligence based controller is aimed for adaptive control throughout the whole motor operating condition. The proposed has improved and better speed and torque performance in constant and ramp input functions but not in the step input function and the attempt requires further research and modification for global application.
A Study on Monitoring System for Grinding Wheel Status Based on Acoustic Emission Technology
Authors: Li Pei Jiang , You Ting
Published: March 2011

The grinding wheel wear status is an important guarantee for the processing efficiency and processing quality of precision and super precision grinding. In this paper, a USB acoustic emission signal acquisition system is designed for online monitoring of grinding wheel status. In the system, CPLD is used as the controller, and a high-speed A/D converter is used to implement the synchronous acquisition of acoustic emission array signals. The collected data are sent into FIFO, and CY7C68013A is used for USB data transmission with upper computer. The sampling frequency of the system can be 10 MHz, and USB transmission speed can reach 40M/S. It is proved that it can meet the monitoring requirements of grinding wheel wear status well by the grinding processing.
Preparation and Properties of Polydicyclopentadiene/MMt Nanocomposites Using Supported Tungsten Catalyst
Authors: Zhang Yu Qing , Nan Yan Yi , Lee Joong Hee , He Yu Xin , Yao Da Hu , Jun Xian Li
Published: March 2011

Polydicyclopentadiene (PDCPD) is a kind of engineering plastic which possesses excellent mechanical performance. It can be made by dicyclopentadiene (DCPD) through Ring-opening metathesis polymerization. In this paper, a supported catalyst of WCl6-phenol on montmorillionite (MMt) was prepared, formed a high efficienct, low-cost and more stable in air, tagether with Et2AlCl as activator, to polymerize the DCPD monomer through ring-opening metathesis polymerization mechanism, and obtained a Polydicyclopentadiene/MMt Nanocomposites. The Molding of PDCPD was finally made by Gusmer-decker’s RIMcell Lt Machine, and the products were characterized by X-ray diffraction, TEM, TGA, SEM, DMA. Mechanical properties were also measured. The result showed that the supported catalyst had good catalytic activity in polymerizing DCPD. MMt was exfoliated in the matrix after the in-situ polymerization, according to the XRD and TEM, which brought about improved properties of PDCPD with small amount MMt dispersed in the matrix.
Guangxi, China-ASEAN Uniform Information Joint Development of Manufacturing and Logistics Industry
Authors: Lin Xing Zhi
Published: March 2011

By the analysis on the manufacturing industry, logistic industry, information and technology integration, and regional advantage of manufacturing logistics in Guangxi,China -ASEAN (Association of Southeast Asian Nations) economic zone, modern manufacturing logistics technology, this article provides the realization means and pattern for the information integration and joint development of manufacturing industry and logistic industry. Information integration and joint development of manufacturing industry and logistic industry of Guangxi,China-ASEAN is by using regional logistic supply chain IFA (Intelligent Flexible Architecture), according to the advantage of Value China by modern logistic joint development, to establish an information integration and combined public service system supported by IOT (Internet Of Things), Internet and CTI (Computer Telecommunication Integration), defines information integration as the middleware to develop U type smiling curve of Guangxi-ASEAN manufacturing industry and logistic industry, and uses multiple modules structure model arithmetic to form Guangxi-ASEAN information integration and joint development model, which realizes information integration and joint development system of logistic socialization, regional economic integration, and logistic factors permutational aggregation for manufacturing industry and logistic industry.
Ultrasonic Machining Aided Tool Rotation of Sintered NdFeB Magnet
Authors: Li Li , Wang F.F. , Niu Zong Wei
Published: March 2011

A new kind of ultrasonic machining is proposed for sintered NdFeB permanent magnet. Experiments were carried out on self-made equipment. Test results showed that the MRR would increase with the amplitude of tool, static load and the size of abrasive grain at certain range. This kind of ultrasonic machining is a suitable method for machining NdFeB material.
Red Clay’s Engineering Property and its Treatment
Authors: Tan Feng Yi , Shao Qing , Jiang Zhi Quan , Hu Sheng Gang
Published: March 2011

The red clay in Kunming New Airport had negative effect, such as more settlement, the differential settlement, the poor property of compactness and water content too difficult to control during construction. Therefore, there were a serial in situ tests for the red clay foundation: (1) the red clay foundation was treated by the dynamic consolidation method(DCM) with cushion and the gravel pile method, then the embankment of red clay, (2)the natural foundation of red clay was filled directly by red clay and Douposi highly weathered material as the embankment material. Their deformation and pore water pressure rules of natural red clay foundation, foundations treated by DCM and gravel pile were obtained on the condition of high embankment by monitoring of settlement, horizontal displacement and pore water pressure. Test results showed that (1)during the embankment construction period, the settlement of DCM test region was maximum, the gravel pile test region second, the natural foundation of red clay was minimum.(2) the low velocity of layered horizontal displacement indicated that the slope was stable. (3) the increasing and dissipation of pore water pressure was accordance with the embankment history. (4) because it was on the embankment construction period, the monitoring data just reflected the deformation rule in the initial stage of loading.
Study of TiC Cutting Tool Insert Using Microwave Synthesis
Authors: Thauri Shahdura Hammad , Ariff Tasnim Firdaus , Karim A.N. Mustafizul
Published: March 2011

Microwave processing ceramics is emerging fast as a new field of ceramic processing and material synthesis. The past year has witnessed significant progress in the aspects of commercialization and application of the technology to new areas. Further research states that Titanium Carbide (TiC) is the best cutting tool due to its high melting point and by that reason this project aims to show the difference between conventional sintering, microwave sintering and Hot Isostatic Pressing (HIP). Two different compositions consisting of 97TiC3Ni and 93TiC7Ni were sintered using conventional furnace, microwave furnace and HIP. Density, hardness and microstructure analysis were carried out on these TiC inserts. 97TiC3Ni produced higher density and hardness values compared to 93TiC7Ni for all three different methods. Microwave sintering produced the highest density and hardness values compared to conventional sintering and HIP. Microwave produced samples with improved density and hardness in a shorter processing time which is 93% faster than conventional sintering and 50% faster than HIP.
Development of a High Speed Vacuum Switch Rated Voltage 3.6kV
Authors: Zheng Zhan Feng , Dong En Yuan , Zou Ji Yan , Tian Peng , Zhang Zhen Wei
Published: March 2011

The paper presents a research and design of a high speed vacuum switch whose actuator consists of an electromagnetic repulsion driving unit (ERDU) and an permanent magnet force holding unit (PMFHU). A 2D finite element model of ERDU is established. The discharging current waveform, the repulsion force waveform and the effect of different distance between the driving coil and the metal plate on force are analyzed based on this model. Three types of PMFHU are proposed. And those holding force curves are acquired by 3D static magnetic analysis and compared with the measured data from the PMFHU prototypes. At last, the mechanical characteristics of the high speed switch prototypes assembled with three types of PMFHU are tested. The results show that the properties of Model 2 meets the requirements of high speed repulsion actuator most.