bluuebunny/crossref_metadata_2025 huggingface dataset:
Development of Cutting Strategy in Ultra-Precision Raster Milling of Freeform Surface
Authors: Wang Su Juan , To Su Et , Chen Xin , Liu Jian Qun
Published: September 2014

This paper studies the development of cutting strategy in the fabrication of freeform surface in ultra-precision raster milling (UPRM). The tasks of developing cutting strategy in freeform machining involve in the selection of cutting parameters and the planning of tool paths. An integrated system is built in this study to develop the cutting strategy, automatically generate NC program, simulate the tool paths and machining process, as well as make predictions for the machining time and the surface quality of the raster milled freeform surface. Experiment is conducted to verify the developed system and the experimental results show that the system is applicable for the machining of freeform surface in UPRM. This study therefore contributes to avoiding the need to conduct expensive and time consuming trial cutting tests to ensure the product quality in the freeform machining.
Effects of Die Temperature on Microstructure Evolution of 7A85 Aluminum Forging
Authors: Hu Jian Liang , Yi You Ping , Huang Shi Quan
Published: September 2014

The free forging process of medium scale specimen was carried out to study the effects of the die temperature on the microstructure evolution of 7A85 aluminum forging. The results show that with the increase of die temperature, the size of the grains and the distribution of dislocations and precipitates of free forging tend to have a high degree of uniformity. Considering the effects of die temperature, the isothermal forging process was applied for the deformation of complex aviation forging. The metal flows smoothly during the isothermal forging process and thus there is little possibility of forming unfill, crack and other defects. The dislocations are evenly distributed during the isothermal forging process. Consequently, there is a relatively uniform distribution of precipitated phases of the aviation forging.
Effect of Iron Content on the Strength and Conductivity of Cu-Fe In Situ Composite
Authors: Liu Ke Ming , Jiang Z.Y. , Wang Yong Hua , Chen Z.B. , Zhao Jing Wei , Lu De Ping
Published: September 2014

Cu-14Fe and Cu-17Fe alloys were produced by casting and processed into in situ composites by hot and cold deformation, and intermediate heat treatment. The microstructures were investigated by using a scanning electron microscope and an optical microscope. The electrical conductivity was evaluated by using a digital micro-ohmmeter. The tensile strength was measured by using an electronic tensile-testing machine. The results show that there are similar cast and deformation microstructures in Cu-14Fe and Cu-17Fe. The tensile strength of deformation-processed Cu-17Fe in situ composite is much higher than that of Cu-14Fe, while the conductivity of deformation-processed Cu-17Fe in situ composite is slightly lower than that of Cu-14Fe at the same cold deformation strain. The Cu-17Fe in situ composite produced by using proper thermo-mechanical processing possesses a good combination of tensile strength and electrical conductivity.
Experimental Studies of a Precision Tool Setting Method for Micro Tool Based on the Principle of Electric Breakdown in Micro Gap
Authors: Xu Zhi Yao , Zhang Zhi Jing , Jin Xin , Deng Yong Jun
Published: September 2014

The accuracy of tool setting has a great influence on the machining accuracy of micro structures. In this paper, electric breakdown in micro gap is used for tool setting and the accuracy of this method is ±0.2μm. Experimental studies have been done to prove the feasibility of this method. Experimental results show that the breakdown voltage is about 30V when the gap between the tool and the tool setting probe is 2μm, and tool diameter has little effect on this phenomenon. With the increase of the tool wear the breakdown voltage shows ascendant trend, so this method can be used to monitor tool wear.
Prediction of Coiling Temperature of Hot Rolled Strip Based on BP Neural Network
Authors: Liu En Yang , Peng Wen , Cao Ning , Yu Si Rong , Xu Jun , Peng Liang Gui , Zhang Dian Hua
Published: September 2014

Coiling temperature of hot rolled strip is one of the important parameters which affect performances of hot rolled strip. The control of coiling temperature is highly nonlinear and time-varying. Based on the laminar cooling control system of a hot rolling plant, a coiling temperature prediction model based on BP neural network was established. Many factors which affect coiling temperature control were taken into account, and the BP neural network was trained by actual production data. The simulation was carried out, which indicates that coiling temperature can be predicted precisely, and the BP neural network model has the prospect of online application.
Preplating Processing of CBN Grinding Wheel Substrate
Authors: Zhang Jun Ling , Wen Zhou , Gong Xiu Duan
Published: September 2014

In the process of modern mechanical parts production, such as parts surface dust, metal powder, coating will appear "nodules" and "burr", easy to fall off small pit of coating surface. So, to ensure the quality of electroplating products plating, to carry out the study on substrate surface treatment before plating technology of plating is very meaningful.
Cu–Ni Alloy Nanoparticles Supported on Multiwalled Carbon Nanotubes Composites with Pre-Treated Multiwalled Carbon
Authors: Wang Tan , Yu Yue , Zhang Xi Wen , Zhao Dong Yu
Published: September 2014

Carbon nanotubes (CNTs) have aroused widespread concern for their unique structure and excellent properties in physical, chemical and mechanical. Fileds copper-nickel alloy (Cu-Ni) is a kind of important conductive metal materials that can be widely used in electric, magnetic, catalytic and many other fields as well. The combination of nanocomposites exhibit excellent comprehensive properties which it make it one of the most promising areas at present. This paper shows the preparation of the work and the test result of carbon nanotubes (CNTs) load the nanocopper-nickel alloy (Cu-Ni/CNTs) composite materials that the nanocomposite can be used as an electrode material and fuel cell. In this paper, carbon nanotubes (CNTs) which were acidized by mixed acid are used as templates to prepare nanocopper-nickel alloy (Cu-Ni/CNTs) composite materials. Experiments prove their electrochemical activity is superior to the pure alloy in alkaline solution, and the peak reaches maximum value when alloy is 20 wt%.
Rolling Process of AZ31 Alloy Bar Using Three Roller Mill
Authors: Guo La Feng , Jiang Le Tao , Li Bao Cheng , Li Zhi Heng
Published: September 2014

Structure and pass system of Y-type mill which have three-roller is analyzed. A hot rolling method to produce magnesium alloy bars through flat triangle-arc triangle-round pass system is put forward. Using Deform-3D software, the rolling process of AZ31 alloy bar is simulated to determine the parameters of the rolling process and die. The experiment verifies that the hot rolling process is feasible. The organizational structure is analyzed with metallographic microscope, and the results show that dynamic recrystallization is occurred, the grain size is obviously refined, and the mechanical property of the material is improved in hot rolling process.
Study on UV Laser Cutting Carbon Fibre Reinforced Composites
Authors: Yang Li Jun , Hou Chao Jian , Zhang Ming , Chen Wei Qiang , Wang Yang
Published: September 2014

Obtaining narrower kerf and smaller heat affected zone (HAZ) is a difficulty in laser cutting carbon fiber reinforced plastic (CFRP) composites. In order to solve this problem, the experiments used a semiconductor UV laser to cut CFRP have been done and how laser parameters (include pulse power, repetition frequency, cutting speed and direction) influent the width and HAZ of kerf have been achieved. In the meantime, compared with infrared laser cutting CFRP, the quality of CFRP cut by different wavelength laser has been investigated. The results show that owing to CFRP has the characteristic of anisotropy, laser cutting direction is the most significant factor that affects the quality of kerf cut by UV laser. The study also found that owing to high single photon energy, the narrower kerf and smaller HAZ around kerf can be get by UV laser cutting CFRP, nevertheless, it can’t be achieved by infrared laser cutting CFRP.
Surface Roughness Research in Turning of Damage-Tolerant Titanium Alloy
Authors: Sun Tao , Chen Zhuo
Published: September 2014

TC21 is a first high strength and damage-tolerant titanium alloy self-developed in China, which has independent intellectual property. As it is known to all, titanium alloy TC21 is one of the most widely used materials in aerospace. The improvement of cutting quality of titanium alloy is an urgent problem. In this paper, the orthogonal experiment were carried out to study surface roughness of turning TC21. The predictive model of surface roughness in turning TC21 was built by analysis of multivariable linear regression on the basis of experiment. Statistical test results indicated the established predictive model were in highly notable test status and had high reliability. These works provide references for machining TC21.
The Mold for Bonded NdFeB Magnet Compression Molding
Authors: Qin Wan Zhong
Published: September 2014

Compression molding is the most important method to gain high quality bonded NdFeB magnets. The production process is preparation of composite powder, compression molding, coating and magnetizing. Based on test and lot production practice, the important effects of compression molding actions, mould structure and mould material on magnet quality are analyzed. The mold structures for ring-magnet and arc-magnet are fixed. The key techniques that controlling the quality of bonded NdFeB magnets are summarized.
Water-Repellent Stability of Superhydrophobic Materials under Hydrostatic Pressure
Authors: Huang Jian Ye , Wang Feng Hui
Published: September 2014

Keeping the water-repellent stability of superhydrophobic surface is necessary in application. Based on the total reflection of Cassie interface and vacuum technique, the superhydrophobic stability of the lotus leaf and an artificial material was investigated. The results show that during the Cassie-Wenzel transition, primary wetting transition occurs at a certain pressure that in accordance with theoretical prediction. However, when the air film is entrapped between microstructures, stability of water-repellency was greatly enhanced, and part of the wetting transition can be recovered when the pressure was released. Due to the micro-and nanoscale hierarchical structures, the lotus leaf shows better water-repellent stability and dewetting property than the artificial superhydrophobic surface when the hydrostatic pressure was applied and released.
Influence of Cutting Conditions on Chip Formation in High Speed Milling of Brittle Graphite
Authors: Zhou Li , Wang Cheng Yong , Li Wen Hong , Zhu Bai Xi , Zhai Yu Jia
Published: September 2014

Graphite chip formation is important for the understanding of high speed milling of brittle graphite. This paper is aimed to reveal the influence of cutting conditions on the graphite chip formation in high speed milling. The relationship between the maximum undeformed chip thickness and cutting parameters was analyzed, and the influence of cutting parameters, tool geometry and milling patterns on the chip formation of brittle graphite was studied. It is concluded that the transitions of graphite chip formations were highly dependent on the undeformed chip thickness which is decided by the combination setting of feed per tooth and radial depth of cut. Big fractured block chip occurs more easily in up milling than down milling. Tool rake angle influences the chip formation according to the maximum undeformed chip thickness.
Research on Laser Engraving Technology for Fabric
Authors: Sun Jie , Wang Mian Mian , Li Ming
Published: September 2014

In order to enhance efficiency of laser engraving technology in fabric manufacture, a laser engraving experiment was conducted on 30 kinds of jeans with CO2 laser engraving machine, and meanwhile the performance parameters of fabric was tested. Then five performance parameters of fabric were chosen through correlation analysis, with each showing a significant correlation with carving levels; a prediction model of carving level was constructed based on GRNN, with a prediction error of less than 3%.The study improves the efficiency of laser engraving and lays foundation for bridging the performance parameters of fabric and sculpture levels .
Research on Microstructure and Wear-Resisting Property of NiCrWMo Laser Cladding on K418
Authors: Huo Wu Jun , Liu Xu , Hu Bin , Wang Zhi Peng
Published: September 2014

Laser cladding on K418 substrate using NiCrWMo powder by Nb:YAG laser was carried out for the repair of aero blades. The microstructure and microhardness of cladding layers were investigated. The result showed that using the correct nickel based alloy powder, at the craft parameter of electric current 160 A, pulse width 8mses, the frequency 4 Hz, the surface is balanced and continuous; the microstructure is close and uniformity; the cladding is well combined with the substrate without flaw; the rigidity of the cladding is higher than the substrate .
Rolling Force Calculation for Strip Cold Rolling Based on Influence Function Method
Authors: Zhou Hai , Bai Jin Lan
Published: September 2014

The rolling force calculation procedure of strip cold rolling is developed based on influence function method, with consideration of the couple of roll flattening model and rolling force model. With the procedure total rolling force and the distribution of rolling force per width of each pass for HC mill are calculated using sampling data obtained from actual strip rolling. Comparing the calculation results with actual measured value, it is shown that the calculated total rolling forces are similar to actual data, and the distribution of rolling force per width is consistent with the actual status. It proved that the calculation method introduced in this paper is an effective method to calculate rolling force, and it can be used in the process control of strip cold rolling mill.
Supplementary Setting of Target Flatness Curves for 1450 Strip Cold Rolling Mill
Authors: Zhou Hai , Bai Jin Lan
Published: September 2014

In this paper, for the original target flatness curves of flatness control system of a 1450 cold rolling mill can't satisfy the actual production, parameter setting method is adopted to the supplementary setting of target flatness curves. Based on the analysis of the several common forms of orthogonal polynomials, Legendre orthogonal polynomials are selected in supplementary setting according to the actual flatness. Considering temperature compensation, recoiling compensation, edge compensation, and comprehensive control of flatness and crown, 18 supplementary setting target flatness curves is determined aimed at typical product of the mill. Actual production shows that after the supplementary setting target flatness curves put into use, the flatness quality of the product has improved significantly.
Analysis on the Temperature Field of Gear Form Grinding
Authors: Ren Xiao Zhong , Hu Hai Feng
Published: September 2014

Aiming at the issue on grinding burn of tooth face, the temperature field formed in helical gear form grinding was analyzed. The finite element model of the single tooth of helical gear was firstly established. Considering the nonlinear relation of the physical properties of gear material to temperature, 3D finite element simulation of transient temperature field was performed by using the rectangular moving heat source model. Finally, the temperature field distribution on tooth face was achieved. The study results show that the temperature is relative low when grinding starts, then the temperature increases rapidly, and the temperature reaches the maximum value at the end of grinding; the increase of grinding depth can result in the rise of temperature when other parameters are the constants.
Analysis the Failure for Earlier Fracture of 60Si2Mn Stabilizer Bar
Authors: An Jia Ju , Zhang Li Ling , Luo Chao Yu
Published: September 2014

The fracture samples of spring steel stabilizer bars in 60Si2Mn were researched in this paper. Through the methods such as macro-and micro-fracture analysis, SEM fracture morphology observation, microstructure observation (surface and internal organization), and macro-hardness testing to analysis the failure causes for earlier fracture of the stabilizer bars. The results were showed that the fatigue crack source for the non-stress stabilizer bar was on the surface. The earlier fracture cause was due to the decarburized layer on the surface and the uneven organization in the internal, which lead to the fatigue resistance at the non-severe stress, was greatly decreased. And the fatigue crack of stabilizer bar in the normal stress was originated at the deformation on the surface in the processing.
Experimental Study of the Pore Density on the Mesh Partition of Exhaust Muffler on Diesel Engine Performance
Authors: Fu Jun , Chen Wei , Tang Yuan , Li Guang Ming , Ma Yi , Zhu Zhi Guo
Published: September 2014

In order to improve the acoustic attenuation performance of agricultural diesel engine exhaust muffler, take the 175 series air-cooled diesel engine as the example. Based on the original exhaust muffler structure and kept the same size of mesh partition aperture and mesh radial distribution, the four groups of different pore density schemes (14 pores/cm2,19 pores /cm2,10 pores /cm2,15 pores /cm2) are designed. The laboratory measurements are used to research the influence of different pore density exhaust muffler effect on the acoustic attenuation performance of the diesel engine. The tests indicated that the No.4 scheme did not increase the power loss, meanwhile, improved the performance of exhaust muffler noise reduction effectively, and the amount of noise elimination increased about 2~4dB(A), which provide theoretical basis for further research of performance optimization of the exhaust muffler.
Tribological Properties of TiAl Coating on Aluminum Alloy Surface by Supersonic Particles Deposition
Authors: Zhu Sheng , Han Guo Feng , Wang Xiao Ming , Liu Yu Xiang , Zhou Chao Ji
Published: September 2014

In this study, Gamma TiAl intermetallic alloy protective coating was deposited on the surface of 5803 aluminum alloy by supersonic particles deposition. Researchers observed the surface morphology of the coating by SEM, and researched tribological properties of the substrate material and the coating by CETR friction and wear tester and Talysurf 5P-120 surface morphology tester. The results show that,the bonding mechanism of the Gamma TiAl intermetallic alloy coating and substrate is mechanical interlocking and metallurgical bonding. The abrasion mechanism of Gamma TiAl intermetallic alloy coating is abrasive Wear. The friction coefficients of the coating are all lower than 5083 alumium alloy. The friction volume of coatings reduced 36.7% than 5083 aluminum alloy with the friction loads 50N. TiAl coating has great function to anti-attrition and wearability.
Simulaiton of the Dual Frequency Capacitively Coupled Ar Plasma Using Fluid Model in Semiconductor Technique
Authors: Gu Xiao Wei
Published: September 2014

Low-pressure capacitively coupled plasmas are now widely used for plasma processing in the semiconductor technique. In this paper, a numerical simulation model was developed to simulate the plasma in a dual frequency capacitively coupled plasma reactor based on a two-dimensional, self-consistent fluid model. The aim of our work is to provide estimates of the main discharge and plasma parameters and to help understand the basic mechanisms governing the CCP etching devices. Accurate solutions of the continuity equations, electron energy balance equation and possion's equation with realistic boundary conditions are obtained. The numerical results are used to analyze the plasma density distribution for one and two dimensional on whole plasma reactor.
Low-Shrinkage Alcohol Cement Concrete
Authors: Shishkin Alexsander , Shishkina Alexsandra , Vatin Nikolai
Published: September 2014

The article deals with the results from the analysis of the materials properties based on portland cement, polyalcohol and iron-bearing mineral assemblage. These materials are proved to possess higher compressive strength and lower shrinkage properties first and foremost, and besides they secure appropriate structural properties under a design project as well. On the grounds of the tests carried out it has been suggested to use the mix design of glycerin with portland cement and iron-bearing mineral assemblage with the purpose to obtain the material having the high compressive strength and most nearly lacking the shrinkage properties.
Problems of Sub-Mountain Area Development Associated with Collapsing Loess Soils (Case of Tajikistan)
Authors: Usmanov Rustam , Rakočević Marina , Murgul Vera , Vatin Nikolay
Published: September 2014

The major part of seismically active Central Asian countries is presented by large-scale sub-mountain upland areas with complex engineering and geological conditions and surface topography as a rule. Plains and flatlands (valleys) in Tajikistan and Kirgizstan account for 10%, and all the rest areas are presented by mountains. Lack of agricultural area is considered to be a pending problem and calls for urgent solution. One of the efficient ways to solve this problem is to develop sub-mountain (hilly) areas which can make it possible to increase level of agricultural production and expand areas for buildings construction. The article deals with sub-mountain development experience based on the case of Tajikistan which can be valuable for different regions.
The Application and Research of Residential Home Solar Visor in Shanghai
Authors: Feng Xin Qun , Yang Bo Han
Published: September 2014

In this paper, taking Shanghai residential area as the main body, and through the research and analysis to the main two residential types in Shanghai area and regard solar energy visor as the research object, explore the characteristics and design method of it. According to the Shanghai annual solar radiation data, using the histogram method and analyze the regional characteristics of Shanghai area, provide reference and basis for residential building solar visor design.
The Damage Assessment of Reinforced Concrete Column under Blast and Loading of Certain Type Rocket Projectile
Authors: Zhang Peng Fei , Zhou Feng Ping , Shen Zhong Qing
Published: September 2014

The new damage assessment criteria of reinforced concrete column was analyzed and defined in the paper. RC column finite element analysis model was established, then damage patterns of the explosion impact on RC column are obtained by means of numerical simulation. The P-I curve of RC column is ascertained. Based on damage criteria and finite element analysis result, we put forward a simplified numerical method to ascertain RC column P-I curve. By contrast, the applicability and validity of simplified numerical method is satisfactory.
The Safety Estimation of the Marine Pipeline
Authors: Muravyeva Liudmila , Vatin Nikolai
Published: September 2014

Reliability assurance and safety assurance are the definitive requirements for marine pipelines whose damages give rise to environmental disasters, while damages repair is very complicated. In view of high operation loads, the pressure and temperature effects combined with the account probable natural extreme effects these requirements make it necessary to tackle many problems associated with evaluation of «pipeline-soil» system interaction. The analysis of these interaction mechanisms has been carried out on the basis of foreign (DNV) and domestic standards.This article focuses on the problem of imposing special (seismic) loads and on engineering methods of measuring medium resistance forces; the subject matter of the article also includes the issues of the marine pipeline safety (risk) evaluation, using the theory of runs as applied to random seismic effects. The requirements for sealines in Russia are governed by Sealine Regulations.
Development of the Ventilation System in Historical Buildings of St. Petersburg
Authors: Murgul Vera , Vuksanovic Dusan , Pukhkal Viktor , Vatin Nikolay
Published: September 2014

The article presents an analysis of the primary technologies used to arrange air ventilation systems in residential buildings in Saint-Petersburg during the late 18th and early 20th centuries. The historic buildings construction and engineering systems is indisputable interest and can be subject to conservation of historic buildings in addition to conservation of architectural facades. The article analyzed historical techniques ventilation device in conjunction with the heating system.
Influence of Heat Treatment on Microstructure and Mechanical Properties of Die-Cast AZ91D Alloy with RE Elements
Authors: Yuan Jia Wei , Li Xing Gang , Zhang Kui , Li Ting , Li Yong Jun , Ma Ming Long , Shi Guo Liang , Li Meng
Published: September 2014

The effect of online solution and subsequent age heat treatment on microstructure and mechanical properties of die-cast AZ91D +1wt. %RE alloy were researched. The results indicated that online solution heat treatment led to inhibit some β-Mg17Al12 phase precipitation, and remained the Al element in matrix plays a role of solid solution strengthening. The online solution samples were aged at 160°C, 180°Cand 200°C. Microstructure results suggested that age treatment caused some lamellar β-Mg17Al12 phases precipitated near grain boundaries. The tensile properties of samples under air cool, online solution and subsequent age heat treatment were tested, which UTS were 194 MPa, 243 MPa and 244 MPa, and the elongation were 3.67%, 3.97% and 1.6%, respectively. The results indicated that the online solution could enhance the mechanical properties significantly, which the subsequent age heat treatment could not improve.
Effect of Constructional Measures on the Total and Local Loss Stability of the Thin-Walled Profile under Transverse Bending
Authors: Trubina Darya , Abdulaev Dzhamal , Pichugin Egor , Rybakov Vladimir
Published: September 2014

Work is devoted to the actual topic - local buckling of light steel thin-walled sections. Method of calculating stability in thin-walled structures described in the work. The mechanisms of local buckling under transverse bending considered by authors.
A Summary for Mounting Buffer Technology of Overhead Weapon Stations
Authors: Mao Bao Quan , Hu Tao , Wu Yong Liang , Lin Yuan , Liang Bo Wei
Published: September 2014

The article first systematically expounds the working principle and deficiencies of spring buffer, spring - hydraulic buffer, compressible liquid buffer, and other typical buffers. And then detailed introduces the generation, working principle and outstanding features of new material buffer. Finally, according to the characteristic of traditional buffer that performance parameters are immutable, presents a soft mounting buffer that performance parameters can be changed of intelligent, provides theoretic and technological reference of Overhead Weapon Stations for its development design and modification upgrade in China.
Research on Background Modeling Based on Low-Rank Matrix Recovery
Authors: Wang Bao Yan , Wang Xin Gang
Published: September 2014

Key and difficult points of background subtraction method lie in looking for an ideal background modeling under complex scene. Stacking the individual frames as columns of a big matrix, background parts can be viewed as a low-rank background matrix because of large similarity among individual frames, yet foreground parts can be viewed as a sparse matrix as foreground parts play a small role in individual frames. Thus the process of video background modeling is in fact a process of low-rank matrix recovery. Background modeling based on low-rank matrix recovery can separate foreground images from background at the same time without pre-training samples, besides, the approach is robust to illumination changes. However, there exist some shortcomings in background modeling based on low-rank matrix recovery by analyzing numerical experiments, which is developed from three aspects.
A Digital Carrier Monitoring System Based on Software Defined Radio
Authors: Yang Yu Jie , Han Gang Weng , Yang Zhe , Shao Hua
Published: September 2014

With the development of DSP technology and improvement of computer hardware performance, software radio technology has been widely applied in the area of satellite communication. Digital carrier monitoring system is a new type of satellite communication spectrum monitoring system. It is based on software radio technology and is networked design, having realized functions of spectrum remote monitoring and networked virtual instrument. This article analyzed functions and working principals of this system, and summarized its application in earth station.
Study on Characteristics and Application of LED Displays
Authors: Wang Xiu Zhen
Published: September 2014

Currently, LED display is an information display technology that has strong function,high efficiency and wide scope of application.Since its development has occurred, LED display has experienced a number of technical improvements and adjustments. This paper studies the basic physical characteristics of LED displays, electroluminescent application status and ultra-high brightness of the display luminescence phenomena, and it proposes future development goals of LED display.
Study on the Driving Circuit of Carbon Nanotube Field Emission Display Based on Luminance Control
Authors: Liu Qiao Ping , Yang Yan Ning , Li Wei Xia
Published: September 2014

Carbon nanotube field emission display (CNT-FED) is one of the most significant subjects due to its unique qualities and perfect performance. But there are still some problems in FED, for example, the modulation of each pixel unit of field emission display device is discrete, and the traditional voltage pulse-width modulation driving mode cannot solve luminance non-uniformity and non-linearity of FED. So a novel driving circuit based on cathode current source is proposed. The current driving circuit can be fabricated on Si substrate in advance, and then carbon nanotube is grown at room temperature, carbon nanotube and constant current source circuits are integrated on the same Si substrate. Current source circuit and cathode emission part are integrated together, which not only can solve the FED luminance problem, but also can meet FED thin design.
The Design and Simulated Analysis of Laser Beam-Shaping System for the Flow Cytometry
Authors: Liu Guo Dong , Hao Xi Ying , Huang Zhen , Ren Zhong
Published: September 2014

As for the requirement of size and energy distribution of focal spot in the laser detection area, this paper designs a laser beam-shaping system of flow cytometry. The 640nm red diode laser and 488nm blue solid laser which are arranged vertically are used as the excitation source. The emergent ray of two lasers is combined by beam splitter, and the combined beam is focused on the screen through two orthogonal cylindrical lens. The focal spot is compressed by doublet lens which is also used to eliminate chromatic aberration of focal spot. Applying ZEMAX software to optimize the whole optical system, the simulated results meet fully the actual experiment for individual blood cells, and it has certain theoretical significance for actual design of optical system about flow cytometry.
Research on Technology of Lightning Protection for Transmission Lines in Lighting Intensified Area with Complex Topography
Authors: Wang Da Xing , Liu Shou Bao , Cui Tao , Xu An , He Bin
Published: September 2014

The weak lighning protection performance of transmission lines should be improved in complicate climate and complex topography as well as frequent lightning activities in Sichuan Area. In order to improve stability of power system, it is very important to improve the assessment and rebuilding abilitiy of lightning protection for transmission lines. In this paper, we researched the lightning protection of transmission lines by the technology and strategy of differentiated lightning protection. We analyzed the distribution law of lightning flashovers for tower span, landform, lightning protection measures and so on. The analysis results can provide a macroscopic guidance for differentiated lightning protection work.
Study on Si-Based LED Integrated Packaging with Vertical Structure
Authors: Guo Mian Mian , Jiang Ying , Wan Qi Xin , Xiong Zhi Hua
Published: September 2014

We study the influence on the luminous efficiency of Si-based LED with different chip spacing. It is found that the optimal chip spacing is 2mm. Furthermore, multi-chips LED with top and back electrodes, according to a certain permutations and combinations way, are packaged integrally on the independent silver reflective layers. We find the LED integrated package devices have higher driving voltage and lower driving current than traditional LED devices with top and back electrodes. In addition, our study shows that independent silver reflective layers can obtain a better luminous efficiency and thermal property.
Design of Small Variable Frequency Speed Regulation System Based on ARM
Authors: Ye Chao , Wang Ting You , Yuan Ye
Published: September 2014

This paper presents a small ARM-based frequency control system, the voltage 220V/50Hz mains, rectified, filtered into DC, then reverse into adjustable frequency alternating current supplied to the motor used. Through software algorithms SPWM control signal generated by the microcontroller, the control signal sent through the intelligent power module, the realization of the DC inverter process. The design is simple, functional and meet the current frequency control system, modular, digital trends, has a waveform, small size, high efficiency, frequency wide range of features. Has good practical value and low cost.
Effect of Pixel Shape on Fluid Motion in an Electrofluidic Display
Authors: Li Xiao Tao , Bai Peng Fei , Gao Jin Wei , Zhou Guo Fu
Published: September 2014

High-efficiency control of the motion of the oil film plays a critical role in optimizing electrofluidic display (EFD) technology. In this paper we focus on studying the effect of different pixel shapes on kinetics of electrofluidic. Four different kinds of pixels including square pixel, rectangle pixel, trapezoid pixel, and triangle pixel were designed and discussed. The electro-optic characteristics and the switching dynamics of four electrofluidic pixel arrays were studied respectively. The results indicate that the reduction of the inscribed circle of pixel grid leads to an increase in the threshold voltage. When the geometry of pixels is asymmetric, the oil film prefers to move towards the small angle which can obtain uniform motion of the oil. Moreover, it also affects the speed of the moving oil/water interface to some extent. In all the geometry design of the pixel provides useful directions for improving the electrofluidic display technology.
Design and Realization of Universal Integrated Testing Platform for Equipment-Embedded Software
Authors: Chen Ce , Zhao Shao Cai , Hu Yong , He Guo Kai
Published: September 2014

An universal testing platform for equipment-embedded software is designed and realized to support the dynamic verification test of embedded software on CI level and system level. This Platform, based on LAN and USB bus architecture, has provided the function of system interface modelling, test project management, test case script code, test result control and analysis, and test report generation, and is available for real time, closed-loop and non-invasive dynamic testing on the embedded software with the characteristic of portability, easy operation, flexibility in size configuration and universality of protocol description.
A Novel Half Bridge Drive Circuit Applied in IGBT Module
Authors: Wang Qiu Yan , Liu Yan , Xu Ping , Luo Da Cheng
Published: September 2014

A high performance and high voltage half-bridge novel IGBT driver circuit is described in this paper. The module integrates dual insulated driving and special protection circuits. It has high push-pull driving capability, bootstrap power supply technology and is easy for inverter miniature design. The paper also introduces the application in portable diesel engine generator and discusses some attention items in practical application. Experimental results show that this driving module has better performance and can reliably drive and protect IGBT.
A Study on Multistage Coordination and Control Strategy for JiBei Grid Considering Wind Power Fluctuation
Authors: Xu Jian Fei , Xu Yu Jie , Lu Feng , Liu Dun Nan , Li Peng Yuan
Published: September 2014

The establishment of independent control area for JiBei grid will improve the flexibility of regulation for local units, and absorb more wind power and other clean energy. However, due to the high proportion of wind power capacity and the fluctuation and intermittent of wind power, it presents a challenge to the power supply safety. In this paper, based on the prediction of regulation demand and regulation speed in different time scales, dynamic hierarchical control method is proposed. Several strategies of hierarchical control under the emergency of steady climbing, reverse and fluctuations are established. Hence, it improves the capacity of power supply safety and the proportion of wind absorption. Finally, based on the measurement of characteristics of wind fluctuation, the value of reserve capacity in different control levels is calculated.
Design and Analysis of a XY Micro-Motion Stage Based on S Type Flexible Mechanism
Authors: Yu Yue Min
Published: September 2014

Piezoelectric materials is a kind of the most common smart materials whose geometric shape can be related to an energy input in the form of electric field. In the application of active materials to electromechanical energy conversion, electrical energy may be input to the material and the resulting deformation of the material can be used to move a load. In this paper, a XY micro-motion stage is designed based s type flexure mechanism and driven through piezoelectric ceramic stack. From the analysis, it can achieve X direction 6.5μm, Y direction 9.7μm micro-displacement output.The results indicate that, the XY micro-motion stage all are satisfy the need of design.
Design of a New Crawler Chassis Brake System
Authors: Lü Xiao Rong , Lü Xiao Lian
Published: September 2014

This paper designs a new type of the crawler chassis brake system, which is suitable for crawler travel system slow walking speed. Characteristic of braking system has simple and compact structure, light weight, flexible use, convenient assembly and disassembly, large braking force, good braking effect, etc., can solve small crawler chassis brake problem very well.
Modeling and Simulation of Slip Frequency Control for Induction Motor in Electric Vehicle EHPS System
Authors: Lin Li , Wang Wen , Liu Zheng Qi
Published: September 2014

According to the assist characteristic of induction motor in Electro Hydraulic Power Steering (EHPS), a slip frequency control system for EHPS system in electric vehicle applied to Electric Control Units (ECU) has been proposed. We analyzed induction motor operating characteristic in EHPS and established a model, and simulated based on Matlab/Simulink. The simulation shows that the proposed control strategy can obtain good control effects, the proposed algorithm is verified.
Simulation on Fuzzy Control on Chatter System Based on Magnetic Fluid/Foam Metal
Authors: Yu Ying Hua , Shen Jia Xing , Ruan Wen Song , Chen Si Yu
Published: September 2014

A new kind of damper with magnetic fluid(MRF)/foam metal designed by us is introduced, and it’s damp model is established. Semi-active controlling shock absorber with the damper is designed, and it’s dynamic module is established. Fuzzy control on chatter system is designed by fuzzy controlling theory. Finally, simulation on it is done by matlab /simulink. It is shown that the control system can restrain the chatter very well.
Study on High Precision Control Scheme of Ceramic Ferrule Concentricity Grinder
Authors: Jin Yan , Lin Hui
Published: September 2014

The paper analyzes the precision coaxial processing requirements and the characteristics of high automatic online compensation, and builds the electric control system based on Delta series products. The system uses a bus controller and absolute encoders servo constitute nearly closed-loop servo control system, combined with torque limiting grading feeding, dressing real-time compensation, stable and high-speed precision machining ceramic ferrule.
The Guidance and Control of Wire-Guided Torpedo in the Condition of the Torpedo Noise Covering the Target Noise
Authors: Yin Wen Jin , Zhang Jing Yuan , Rao Zhe , Zhang Yong Ping
Published: September 2014

This paper studies the attack method in the condition of the torpedo noise covering the target noise with the help of calculation azimuth guidance. To verify the effectiveness of the scheme, the paper does simulation calculation. The simulation results demonstrated that the effect is good and the scheme haves usage value.
A New Structure Design Method for Improve Modular Joint Output Performance in Modular Robot
Authors: Li Xiao , Sun Han Xu , Tang Ying Wen , Song Jing Zhou
Published: September 2014

A novel structure design method to improve the output performance in course of modular robot is presented in this paper. The new design parameter of modular joint is defined based on analysis of existing joint. Output torque and Max speed is increased by means of different Brushless DC-Servomotor and harmonic reducer in limited interspace. The repeated positioning accuracy is not reduced when output torque and Max speed are increased. And parts of the process parameters is improved. The new design parameters show that the design method is feasible.
Calculation on Stator Core Dynamic Characteristics of 600MW Turbo-Generator Based on FEM
Authors: Wang Fa Lin , He Yu Ling , Tang Gui Ji , Ke Meng Qiang
Published: September 2014

This paper investigates the dynamic characteristics of 600MW turbo-generator stator core, including the bending modes, the torsional modes, the elliptical modes, the axial modes and the triangular modes. The magnetic pull formula under the steady-state condition is firstly deduced, based on which the pulsating characters and the core deformation due to the pull excitation are analyzed. Then, the finite element (FE) model of the stator core is set up and imported into ANSYS Workbench to calculate the natural frequencies and the vibration modes. Finally, the calculation is verified via comparing with the experimental data in the published papers. It is shown that the first natural frequency is much larger than the excited working frequency, which means the stator core is in a safe operation condition. The calculation proposed in this paper accords well with the experimental data obtained by other researchers.
Kinematical Simulation of 3-DOF Parallel Mechanism Based on ADAMS
Authors: Qi Xiao Yan , Wang Wei Ren , Dong Hao , Li Wei
Published: September 2014

Kinematics analysis of mechanism refers to analysis for pose、speed and acceleration of mobile platform of spatial 3-RPS parallel mechanism. In this paper, mathematical model of spatial 3-RPS parallel mechanism is primarily built, and the close loop equation is adopted for the positional posture analysis of the mobile platform, then the positional posture of mobile paltform is acquired. Finally, kinematical simulation will be acquired by software Adams, which makes sense in kinematical performance of spatial 3-RPS parallel mechanism.
Study on a Fast Tool Servo (FTS) Driven by Piezoelectric Ceramic
Authors: Li Ke Tian , Chen Xin , Chen Xin Du , Liu Qiang , Zhou Huan Wei
Published: September 2014

It is designed a Fast Tool Servo (FTS) device which based on piezoelectric ceramic and jointed by flexible hinge. The flexible hinge has been analyzed and optimized both by the theoretical calculation and finite element analysis; and it has been physically manufactured and tested by means of pressure sensor and laser interferometer. The stiffness model was established. The driving voltage and displacement relationship has been revealed. The results indicate that this FTS system can reach a travel range for 60μm,the frequency response precedes 150Hz within 39μm travel range.
Design of Automatic Control Device of Central Heating Temperature
Authors: Shen Hai Yan
Published: September 2014

Through the experimental design of heating temperature automatic control device, the device is mainly composed of two parts: one is the time - temperature intelligent control instrument, two is the control of water circulation and the disconnection of the electromagnetic valve. The device can be based on user needs, set heating time for opening and closing as well as to maintain the temperature range, automatically adjust the heating temperature in the room. Based on the design of automatic control device of heating temperature, can effectively control the production workshop and office space temperature, is conducive to the protection of the product quality; also can be used for the enterprise, family and other heating control, for the user save a lot of heating fund.
Modeling and Control of a Micro Flapping Wing Rotor
Authors: Hang Yan Fang , Lu Jing , Hu Ying Jun
Published: September 2014

The system of Micro Flapping-wing Rotor to achieve the flapping and rotation motions is first introduced briefly. Then the system dynamic model which includes the flapping rotary flight aerodynamics at a low Reynolds number regime, the body dynamics, the electromagnetic actuator and the control surface is described. This model and system simulation in the preliminary design phase may provide the opportunity for designers to make fundamental design decisions early to improve the flight performance. Also, the simulator is used to study open loop flight dynamics and test a periodic proportional output feedback control law. Simulation testing shows that the control system has a good flight performance for this flapping wing rotor.
Research of the Simulation Experiment Platform for Grinding Process Control
Authors: Li Ying Sen
Published: September 2014

Grinding process is a critical procedure of mineral process, and its running character is extremely important for the productivity and quality improvement. It is of comprehensive and complicated characteristics of nonlinearity, large time-delay, slow time-varying and so many key engineering parameters which can not be detected online. It is dramatically significant and difficult to study the control algorithms, the optimization algorithms and the soft censor techniques for grinding process. In order to decrease the cost and risk of practical debugging, how to establish a control simulation system of grinding process for engineering is an issue which has greatly practical value. The simulation experiment platform for grinding process control is designed and developed. The general structure of the platform including real control system and virtual production plant is proposed. Thus, a kind of engineering experiment environment is provided for control and optimization algorithms.
Tracking Control for a Class of Switched Fuzzy Systems
Authors: Yang Hong , Lü Huan Huan , Zhang Le
Published: September 2014

This paper investigates the problems of tracking control for switched fuzzy systems. Based on the state-dependent switching method, sufficient conditions for the solvability of the tracking control problem are given. We use single Lyapunov function technique to design a tracking control law. The controller design problem can be solved efficiently. A numerical example is given to show the effectiveness of our method.