bluuebunny/crossref_metadata_2025 huggingface dataset:
Friction and Wear Behaviors of PTFE Composites Reinforced with Different Fillers
Authors: Wang Li Qin , Sun Jian Wei , Gu Le
Published: December 2011

The tribological performances of mixed PTFE-based composites were evaluated on the MM-200 block-on-ring test rig under dry friction condition. The following filler contents: carbon fiber (CF), flake graphite (FG) and spherical graphite (SG) were adopted to investigate their effects on the tribological performances of the composites. The experiments were carried out by a four levels orthogonal table-L16（43）, and the experiment data were deal with the methods of range and variance analysis. The results shown that all the filler contents could reduce wear, and the wear rate was stable when the content of fillers were more than 10 wt.%. The degrees of three fillers affecting the wear of composites were CF>FG>SG, and that affecting the friction coefficient were SG>CF>FG. The friction coefficient decreased with increasing the contents of SG, increased with that of CF, first decreased and then increased with that of FG. When the contents of FG is 15 wt.%, the friction coefficient is the lowest. The main worn form was adhesion wear.
Adaptive Control Design for Hydrogen Production via Autothermal Reforming of Methanol
Authors: Zheng Jian Feng , Yang Qin Min , Lu Jian Gang , Sun You Xian
Published: December 2011

Autothermal reforming of methanol is considered to be a promising choice for hydrogen production. However, due to the fact that a series of complex chemical reactions are involved, an exact mathematical model is extremely hard to be established, which makes the control of the process a recognized difficulty. Therefore, an adaptive feedback control method is proposed in this work for the control of hydrogen production through autothermal reforming of methanol without the requirement of an accurate model. Theoretical analysis proves that this control strategy can achieve very good performance even when the system’s parameters change significantly. Moreover, simulation results demonstrate the feasibility of this approach.
Study on Refining Technology for Reducing the Content of T[O] in Steel
Authors: Yang Xing Di
Published: December 2011

In order to produce low oxygen steel with high quality, converter slag-tapping, slag oxidability and oxygen activity have been analyzed. In addition, modifying and adding process of slag, control of slag oxidability and bottom argon-blowing in ladle were studied as well. On this basis, refining process which is beneficial to low oxygen steel producing with converter-continuous casting process has been developed. The results show that content of T[O] in steel is not more than 15×10-6.
Influence of Nano-Serpentine on Tribological Behaviors and Wear Process of Hybrid PTFE/Kevlar Fabric Composites
Authors: Lu Ling , Yang Yu Lin , Qi Xiao Wen , Hou Zong Xiang
Published: December 2011

Tribological behaviors and wear process of the unﬁlled and 2% nano-serpentine ﬁlled polymer-based hybrid PTFE/Kevlar fabric composites were evaluated on a MMU-5G friction and wear tester. The variation of the morphologies of the worn surface and the morphologies of transfer film during the wear processes of the two composites were observed and analyzed by means of the confocal laser scanning microscope (CLSM). The results show that the addition of nano-serpentine can effectively slow down the wear process and obviously improve the wear resistance of the hybrid PTFE/Kevlar fabric composite, meanwhile the friction property was ameliorative. That probably because the nano-serpentine does not only have the admirable tribological performance, but also have excellent surface activity, which improved the formation of the self-lubricating transfer film.
Characterization of Cobalt-Based Catalyst Supported on TiO2 Nanofibers for Fischer-Tropsch Synthesis
Authors: Yu Shi Yong , Ma Yun , Cao Zhen , Su Hai Quan
Published: December 2011

The cobalt-based FT catalysts, in which Co crystals supported on TiO2 nanofibers, were prepared by convenient method. The structure of the catalysts was examined and cobalt-based catalysts using TiO2 nanofibers as a support for the application of FT were investigated. Based on CO hydrogenation, the cobalt species dispersed on the TiO2 nanofibers have higher selectivity and activity.
Study on the Properties of PVDF/LCP Blending Membranes
Authors: Liu Ying , Zhang Yu Feng , Wu Chang Cheng , Liu Dong Qi , Han Shu Fa
Published: December 2011

In this study, polyvinylidene fluoride/liquid crystal polymer (PVDF/LCP) blending membranes were prepared via phase-inversion. LCP is ethyl cellulose (EC) dissolved into acrylic acid (AA). The properties of these blends were measured by differential scanning calorimeter (DSC) and polarizing microscope. The results indicate that LCP formed at the concentration of 0.60g/ml and the blends begin to be observed the presence of liquid crystal. Moreover, at a certain temperature range, higher temperature can quicken the formation of liquid crystal. With the adding of LCP, the cholesteric liquid crystal can be still retained in the blending membranes, but the solution enthalpy decreased.
Study on Rotary Object Recognition Technique from the Complex Background
Authors: Li Bao Zhang , Sha Mo Yu , Cui Yan Ping
Published: December 2011

Target recognition from complex background is the emphasis and difficulty of computer vision, and rotary objects is widely used in the military and manufacturing field. Rotary object recognition in complex background based on improved BP neural network is proposed in the dissertation. Median filter is adopted to get rid of the noise and an improved method of maximum classes square error is used to compute the threshold of the image segmentation. The target recognition system based on improved BP neural network is established to recognize the rotary objects, and seven invariant moments of rotary objects serve as the input feature vector. The experiment results show that the image noise could be gotten rid of effectively and the image could be segmented exactly by the image preprocessing method put forward in the dissertation, and the seven invariant moments is appropriate for the character of rotary objects, and the rotary object recognition system based on BP neural network acquires an excellent recognition result.
Surface Topography of Vinyltriethoxysilane Films Deposited on the Silicon Dioxide Substrate (0001) Investigated by Atomic Force Microscopy
Authors: Wu Yun , Cai Chu Jiang , Shen Zhi Gang , Ma Shu Lin , Xing Yu Shan
Published: December 2011

The surface topography and growth behavior of self-assembled monolayers (SAMs) formed from vinyltriethoxysilane (VTES) at a constant temperature (20°C) on silicon dioxide substrates were investigated using atomic force microscopy (AFM). Two methods for silanization were introduced: vapor phase deposition and deposition from a solution. The influence of deposition conditions on the topography of silane films was also studied. The property of modified SiO2 substrates surface was characterized by static water contact angle measurements. The experimental results revealed that the silane films deposited from the solution method grew via islands, whereas this is not the case for vapor phase deposition. The roughness of the layers deposited via solution method first decreased and then increased with the VTES concentration increasing, while the roughness of the layers deposited via vapor phase increased straight. Furthermore, the adsorption types for silane being adsorbed on SiO2 substrates were also investigated. The results indicated that there were two adsorption types in both deposition processes: physisorption and chemisorption.
Hydrochloric Acid Corrosion Behavior of Nb2O5-Al2O3 Ceramics Prepared by Microwave Sintering
Authors: Ai Yun Long , He Fei , Liang Bing Liang , He Wen , Liu Li
Published: December 2011

The influences of Nb2O5 on the phase, microstructure and hydrochloric acid corrosion behaviors of Nb2O5-Al2O3 ceramics sintered with 2.45 GHz microwave energy were investigated. The results showed that Nb2O5 reacted completely with Al2O3 to form AlNbO4 and densified the pure Al2O3 at a lower sintering temperature and in a short sintering time. Nb2O5-Al2O3 ceramic samples were corroded in diverse concentration hydrochloric acid for different time. Weight loss rate of Nb2O5-Al2O3 ceramic rose dramatically when the corrosion time was not longer than 4 h, and it increased slowly beyond 24 h. After Nb2O5-Al2O3 ceramic samples were corroded for 1 h, pitting corrosion was observed by scanning electric microscope, which was consistent with the analysis results of the scanning Kelvin Probe.
Dyeing of Degummed Silk Fibers with Anthocyanins in Red Cabbage
Authors: Yen Chien Kuo , Peng Li Yuan , Wang Chao Xia , Chen Yen Yu
Published: December 2011

Extraction of anthocyanins in red cabbage leaves was taken up using hydrochloric acid solution. Raw silk fibers were degummed with traditional Marseille soap. Then the dyeing of degummed silk fibers with anthocyanins extracted from red cabbage was investigated. It was concluded that, K/S of silk increased in the order of the dyeing with Co(II) > Zn(II) > Ni(II) > Fe(II) > Al(III). The maximum adsorption wavelength of dyed samples at different pH values shifted to different values and the color strength values also changed. In addition, the higher dye concentration, the higher color strength values. Deep shade (K/S value = 6.655) was achieved at 40°C and pH 2 using zinc chloride.
A Study on Microstructures and Creep Behaviors in the Mg-3Sr-xY Alloys
Authors: Hu Ming , Fei Han , Gao Jing , Zhao Fang Fang
Published: December 2011

In this paper, the author successfully fabricated Mg-3Sr-xY alloys by melting-leaching reduction method using SF6 and N2 as protected gas. The microstructures of the Mg-3Sr-xY alloys were investigated in details，and the results showed that Mg-3Sr-xY alloys are composed of dendrite α-Mg and eutectic α-Mg and Mg17Sr2 and Mg24Y5 particulates, the second phases distribute in the α-Mg dendrites and interdendrites. The fiber microstructures form after thermal extrusion and the dynamic recrystallization occurs. In Mg-3Sr-xY alloy, the tensile strengths, the yield strengths and elongation rates increase firstly, reach the peak values, decrease with the increasing in Y content. Mg-3Sr-xY alloy have the best mechanics properties, including yield strengths and ultimate strengths and elongation rates and creep properties by the addition of 0.6%Y content. The tensile behaviors at elevated temperatures are accord to general laws for the metals at room temperature. The Mg-3Sr-xY alloys with 0.4-1.0% Y are of best creep limit. The dislocation sliding and climbing is the main creep mechanism for Mg-3Sr-0.6Y alloys.
Growth of Cu2ZnSnS4 Thin Films by Sulfurization of Co-Sputtered Metallic Precursors
Authors: Li Xin Yi , Wang Da Chen , Du Qin Yang , Liu Wei Feng , Jiang Guo Shun , Zhu Chang Fei
Published: December 2011

CZTS thin films are fabricated by sulfurizing co-sputtered metallic precursor CuZnSn layers under H2S atmosphere. The precursor layers are Cu-poor, Zn-rich deposited and the fabricated films are about 2 µm in thickness. A closed-tube process is preferred with regard to its producing large closely pack grains with smooth surface. XRD and Raman confirm the CZTS structure and the impurities on the surface are removed after suitable chemistry treatments. The band gap of the CZTS is determined to be 1.48 eV by extrapolation. Some more CZTS films are product with slightly changed parameters, sulfurization time, temperature and concentration of H2S, respectively. It is supposed that beside sulfurization time, the temperature could be more significant than concentration of H2S in the closed system.
Spatial Location of Zerovalent Iron Nanoparticles in Montmorillonite
Authors: Fan Ming De , Hao Jiao , Zhang Yuan , Jing Gui Dong
Published: December 2011

The spatial location of zerovalent iron nanoparticles hybridized with montmorillonite was identified with easily accessible X-ray diffraction, transmission electron microscopy, and element analyses. These hybridized nanoparticles are not intercalated into the interlayer space of clay whereas mainly located on the external surface of clay. This result would be of great importance for the sorption-based applications of these heterostructures.
Synthesis, Electrical and Humidity Sensing Properties of BaTiO3 Nanofibers via Electrospinning
Authors: Zhang Hong Di , Long Yun-Ze , Li Zhao Jian , Sun Bin , Sheng Chen Hao
Published: December 2011

Barium titanate (BTO, BaTiO3) nanofiber was prepared via electrospinning and followed annealing process. The as-spun and calcined BTO nanofibers were characterized by a scanning electron microscope (SEM). After annealing at 800 °C in air for 3 h, polycrystalline BTO nanofibers with 120-200 nm in diameter were successfully obtained. I-V characteristic curves of single BTO nanofiber were measured. The p-type semiconducting fiber shows a room-temperature conductivity of about 0.3 S/cm. In addition, the small humidity hysteresis demonstrates the application prospects of electrospun BTO nanofibers in the fabrication of a high-sensitive humidity sensor.
Preparation and Characterization of Aluminium-Doped SnS Thin Films
Authors: Zhang Shuai , Cheng Shu Ying , Jia Hong Jie , Zhou Hai Fang
Published: December 2011

Metallic-doping chalcogenide compounds have attracted significant interest in application of photovoltaic devices recently. In this article, Al-doped SnS films with a thickness of about 500 nm have been deposited on glass substrates by thermal evaporation technique. Al-doping concentration (from 0 at. % to 15 at.%) in the SnS films can be controlled accurately by varying Al layer thickness. The effects of Al–doping on the physical properties of the films have been investigated by X-ray diffraction, scanning electron microscopy, ultraviolet-visible-near infrared spectroscopy measurements and Hall effect measurement system. All the films are orthorhombic SnS with preferred (111) crystallites orientation, and they are of p-type conductivity. With the increasing of Al-doping concentration, the evaluated direct band gap Edir of the SnS: Al films decreases from 1.50eV to 1.29eV and the conductivities of the films increase. Therefore, the optical and semiconducting properties of the SnS films have been improved by Al-doping.
Condition Analysis of Nitrogen Remove from the Mixture of Municipal Wastewater and Fecal Sewage
Authors: Shi Ming Yan , Mo Dong Hua , He Kang Sheng , Li Jing Peng
Published: December 2011

In order to ensure the stable and standard discharge of mixed nitrogen sewage, Guangzhou Datansha Wastewater Treatment Plant has made a test using an inverted A2 / O process, with the actual Wastewater as entry water. When the ratio of mixed fecal sewage is 0.33%, the results showed that, extending the HRT(Hydraulic Retention Time) can help to enhance the effect of removing nitrogen, and HRT should be ensured at least 8 hours under the test conditions. And the increase of the concentration of dissolved oxygen can promote the effect of removing nitrogen ranging from 1.0 to 1.5 mg/L. And the sludge reflux ratio should be remained at 60%. Besides, the growth of sludge age has positive effect on nitrification, so the sludge age should be controlled in more than 20 days under the experimental conditions.
Ferroelectric and Dielectric Properties of La2O3-Doped BaTiO3 Ceramics
Authors: Wang Yi Shan , Deng Xiang Yun , Zhang Yan Jie , Yang Ren Bo , Han Li Ren , Wang Chuan Fang , Yang Xue Liang , Zhang Xiao Long , Liu Jia , Li De Jun
Published: December 2011

The different concentration La2O3-doped BaTiO3 ceramics were prepared by sol-gel method. The ferroelectric and dielectric properties of the ceramics are characterized by TF analyzer 2000. With the increased amount of La2O3-doped, the dielectric constant increase gradually, when the sintering temperature is 1250 °C, the dielectric constant has reached 4648 for La2O3 with 0.4％-doped. With the temperature increased the dielectric constant of La-BaTiO3 increase gradually, when the sintering temperature is 1290 °C, the dielectric constant has reached 7066 for La2O3 with 0.4％-doped.
SERS Study of Malachite Green on Silver Nanocaps Arrays
Authors: Fan Yun , Man Shi Qing
Published: December 2011

In this paper Ag nanocaps arrays were fabricated with a seed-mediated growth method by depositing Ag films on top of self-assembly close-packed monolayer of SiO2 nanoparticles. Their surface morphologies and optical properties were characterized using TEM, SEM and UV-Vis spectroscopy. Malachite green (MG) was chosen as analyte, the Surface-enhanced Raman Scattering (SERS) spectra of MG adsorbed on Ag nanocaps arrays were investigated. The enhancement factor was estimated to be as large as 4.5×109. These results revealed that these Ag nanostructures are promising for SERS applications in trace measurement and analysis of biological molecules.
Applications on Nanocomposite Coating Technology in Plastic Injection Mould Cavity Surface Treatment
Authors: Wang Bin , Li Jing , Wang Chang , Hu Xiu Xin
Published: December 2011

Nano surface engineering is a protection technology using nanometer material and nanometer technology, pointing at failure forms, characteristics and mechanism, comprehensively using a variety of traditional surface engineering technology. Nanocomposite coating technology which develops on the basis of the traditional composite coating technology was briefly introduced in the article. The research of application nanocomposite coating technology in plastic injection mould cavity surface treatment has just started. The nanocomposite coating technology was compared with the ordinary nickel electro-brush coating and the basic approach which realizes nanometer on the mould cavity was described. The advantages of nanocomposite coating were comprehensively and effectively explained. It can increase the coating thickness and hardness, improve the abrasive resistance, fatigue resistance and corrosion resistance of the plastic injection mould cavity, thereby enhancing the service life of mould.
Numerical Study on Uniaxial Compression Test of Rock Specimen with Random Holes
Authors: Xie Bing , Guo Li , Xia Xiang
Published: December 2011

Numerical specimens with ramdom holes is established by particle flow code PFC2D and uniaxial compression tests are conducted. Studies have shown that the uniaxial compressive strength of the specimen accelerated decline while the porosity increasing uniformly. With the increasing of the porosity，the plastic of the specimen increases.
Research on Surface Coating Technology of PCB Based on ENEPIG
Authors: Yu Jin Wei
Published: December 2011

Now the protection method for PCB welding board, widely used coating technology is ENIG , but in use course found that the coating will appear “black mat” that is fatal flaw in the welding process, in order to solve this problem, the engineers and technicians have taken various methods of strict control parameter, despite the improvement, but has not eradicated “black mat” this hidden trouble .Electroless palladium layer is introduced in ENEPIG surface coating new technology, from the reaction mechanism stopped nickel-plate oxidation, in the process of immersion gold blocked off nickel-plate contacted with Immersion gold solution, and effectively prevent pervasion and migration of nickel , thus effectively inhibit oxidation of nickel surface, prevent the “black mat” flaw . Not only have given the technology production process and parameter control, but also have microcosmic appearance and diffusibility analysis for the products by using SEM and EDS , the results showed that palladium layer is non-crystalline film with good uniformity of coating thickness, and did not find pervasion of nickel on gold surface, successfully achieve ENEPIG PCB mass production, replace ENIG technology .
Fracture Analysis of the Tearing NBR Aged at Different Temperature
Authors: Zhao Li , Wang Shuang , Chen Yu , Zhang Wei Fang
Published: December 2011

This paper analyzed the fracture of the tearing NBR 5621 samples under 500mm/min which had been respectively aged for 24 hours at the temperature of -45 °C, 25°C, 70°C and 120°C. It investigated the fracture characteristic of the tearing samples of NBR, which is flat and on it there are some step faceting. The fracture mechanism was also analyzed. The discussion illustrated that the ageing temperature influences the fracture appearance and has little effect on the fracture strength.
Hygrothermal Characterization of Porous Building Materials-New Research Method on Water Vapor Transmission
Authors: Yu Shui , Zhang Xu
Published: December 2011

The research on water vapor transmission (WVT) has an important function on analyzing moisture transport through building materials. According to ASTM Standards, there are two traditional methods (Dry cup and Wet cup) to test WVT of porous materials for practical application, without considering the influence of relative humidity and air flow. In this paper, multilayer method is used to test WVT of porous materials, without the influence of air flow on the whole testing process. Multilayer test method is the new way and there is little experience on how to conduct the whole process, how to obtain the accurate data and make the whole process reasonable is the big issue. Through several cases are worked on and analyzed, then renew desiccant every two hour which is depending on the type of porous materials, is the best way to make the whole testing system reaching to steady state for special building materials. At last, this paper shows that the new way is more reasonable and has higher accuracy than traditional method to get WVT.
Research on Bonding Technology Match of ENEPIG PCB of Digital Microphone
Authors: Yu Jin Wei
Published: December 2011

By analyzing the crucial structure of digital microphone , it has character of welding and bonding technology, in order to increase reliability of PCB connecting , especially reliability of PCB for IC bonding with chip connecting , ENEPIG PCB is leaded in , and achieve the high reliability connecting . And according to the demand of bonding technology , bonding temperature, bonding machine pressure, bonding power and bonding time are elected , a series of bonding experiments have been done , obtain some related experiment data of bonding point and analyze the data , obtained the plating thickness parameter of matching with ENEPIG PCB .
SHS-TiC Particle Reinforced Hardface Coating Prepared by Vacuum Cladding Process
Authors: Lin Tao , Wen Fang , Liu Xiang Qing , Guo Zhi Meng
Published: December 2011

A particle reinforced hardface coating was prepared by vacuum cladding process. Firstly, titanium carbide composite powders were prepared by self-propagating high-temperature synthesis (SHS). The hardface coating was then formed on plain carbon steel substrate with the TiC composite powders and high chromium iron-based alloy powders by vacuum sintering. The microstructure of the coating was observed and then the wear resistance was studied. The results show that TiC composite particles uniformly distribute in the coating. The coating and the steel substrate are chemical bonded with each other. When the size of TiC particles is unchanged, with the increase of quality fraction of the TiC particles, the hardness increased gradually and the wear resistance of composite coating under different conditions changed. The unit area weigh loss increased following by the load increasing, and the unit area weigh loss is the most under Alkaline condition. And the unit area weight loss increased following by the increase of the abrasive and the reaction time.
Effect of Process Parameters on Deposition Rate of Electroless Ni-P Plating on AZ91D Magnesium Alloy
Authors: Wang Hui Long , Liu Ling Yun , Jiang Wen Feng
Published: December 2011

The effects of the concentrations of NiSO4•6H2O, NaH2PO2•H2O and complexing agents in bath, temperature, pH, SiC concentration etc. on deposition rate of electroless Ni-P plating were systematically studied. The appropriate deposition rate of electroless Ni-P plating (17μm h-1) was obtained at the optimal conditions. The deposition reaction dynamics of electroless Ni-P plating on AZ91D magnesium alloy was discussed and the corresponding kinetic model was also determined based on the corresponding experimental results.
Surface Topology Optimization of Air Bearing Slider for Wear Durability in Magnetic Hard Disk Drives
Authors: Zhao Da Wei , Zi Yan Yang , He Zheng Jia
Published: December 2011

In order to protect the slider and disk from excessive wear, a numerical scheme is proposed for transient dynamics at slider/disk interface with the emphasis on the slider wear mechanism and the surface topology optimization of sub-ambient pressure slider. For each transient flying height and slider attitude, the modified Reynolds lubrication equation is solved by the control volume method to obtain the simultaneous pressure distribution in the slider surface. Then the dynamic flying attitude of the slider subject to the calculated pressure distribution can be solved by the Quasi-Newton iteration method at each time step. On the basis of above work, the optimization of the slider surface topology is implemented, and it’s concluded that slider crown has the most significant impact on the dynamic flying attitude and stability. Finally, a sub-ambient pressure slider is designed, which can effectively avoid the slider wear and severe fault of hard disk drive.
Inhibition Effect of Compound Boricacidester on the Tungsten Carbide Leaching of the Cemented Carbide Tool
Authors: Jia Xiao Ming , Song Yue Xin , Hou Suo Xia
Published: December 2011

Working fluid is commonly used in the making and using progress of cemented carbide tool. The tungsten carbide leaching of cemented carbide tool will be resulted in by the sodium carbonate in cutting fluid, because of the tungsten carbide will occur oxidative dissolution. The inhibitor that suppress tungsten carbide leaching of cemented carbide tool is investigated by soaking experiments, friction experiments, SEM analysis, and energy spectrum analysis. The test result shows that aqueous solution and sodium carbonate will cause tungsten carbide leaching through oxidative dissolution; but compound boricacidester contain benzotriazole could suppress tungsten carbide leaching. The Inhibition mechanism is that compound boricacidester contain benzotriazole could generate complete and compact protective film on the surface of cemented carbide tool, therefore, tungsten carbide leaching is inhibited. Add compound boricacidester contain benzotriazole to the water-based cutting fluid could suppress tungsten carbide leaching effectively.
Analysis of Flue-Gas Side Abrasion in Thermal Power Plant Boiler
Authors: Zhou Yong Yan , Zhao Yong Fu , Chen Tian Sheng , Lu Guo Hua
Published: December 2011

Several different kinds of flue-gas side abrasions occurred in thermal power plant were discussed. And the occurring positions, characteristics, influence factors as well as identification and prevention methods were also introduced in detail. So some advice may serve a reference for efficiently identificating and preventing boiler failure caused by flue-gas side abrasion.
Comparative Study on the Impurities Content of Hydrogenated Transformer Oil under Static Condition
Authors: Qian Yi Hua , Huang Yi Bin , Fu Qiang , Wu Hai Yan , Zhong Zhen Sheng
Published: December 2011

The impurities content of domestic hydrogenated transformer oil and three kinds of naphthenic transformer oil had been determined by using the specified experimental methods. A series of experimental data had been obtained, including mechanical impurities, particulate contamination, corrosive sulfur, sulfur content, total acidity and interfacial tension. The impurities content of four kinds of transformer oil were compared with the quality indicators of transformer oil on GB/T7595-2008. The results showed that the impurities content of the former was not so satisfying although it had excellent electrical properties and the technology needed to be improved.
Development and Application of Advanced Coiling Temperature Control System in Hot Strip Mill
Authors: Peng Liang Gui , Liu En Yang , Zhang Dian Hua , Liu Xiang Hua , Xu Fang
Published: December 2011

Run out table cooling equipment and coiling temperature control (CTC) system, especially mathematic models of a hot strip mill were introduced. Heat transfer models such as air convection model, heat radiation model and laminar cooling model, process control models such as segment tracking model, feedback control model, self-learning model and case-based reasoning model were detailed described. Since online application of the new CTC system, the laminar cooling control system has been running stably and reliably with a high precision of coiling temperature.
Design of a Tribo-Simulator for the High Strength Steel Friction and Wear Investigation in Hot Stamping
Authors: Tian Xiao Wei , Zhang Yi Sheng , Wang Zheng , Li Hong Qing , Wang Liang , Zhu Bin , Li Jian
Published: December 2011

Hot stamping has become the main technology to produce complex-shaped high-strength steel components. However, hot sheet metal forming can cause high rates of die wear and the scratching of the productions. A hot drawing tribo-simulator was designed to investigate the friction and wear behavior of high strength steel at elevate temperature. The value of the friction coefficient was obtained to examine the function of the tribo-simulator. The results prove that the coefficient of friction in hot stamping can be measured using this tribo-simulator. Moreover, the coefficient of friction is able to be used in finite element simulation to improve the accuracy of the modeling results and it is also an important indicator to evaluate the tribological behavior between the die and sheet metal.
Effect of Solution Treatment on the Microstructure and Reverse Martensitic Transformation Behavior of a Novel Porous CuAlMn Shape Memory Alloy
Authors: Wang Qing Zhou , Cui Chun Xiang , Yan Na Jun , Wang Qian
Published: December 2011

A novel porous CuAlMn shape memory alloy (SMA) has been successfully fabricated by sintering-dissolution process. Effect of solution treatment on the microstructure and the reverse martensitic transformation (MT) behavior of the resulting specimens are investigated by means of SEM, optical microscope, DSC and internal friction (IF). The results show that with increasing solution temperature, the content and the size as well as the arrangement order of martensite in matrix increase. The reverse MT behavior follows different dependences on solution temperature and solution time at different temperature ranges. The related mechanisms are discussed in terms of the changes of the content of martensite and the concentration of quenched-in vacancies.
The Modeling and Simulation of Mirostrip Bandpass Filter Using ADS
Authors: Li Wei Ping , Luo Hui , Guan Xui Hui
Published: December 2011

Microstrip filter is used widely in wireless communication area, especially in WLAN. Compared to the conventional manufacturing techniques using lumped element, we can get extremely better characters in high frequency wave band using microstrip lines. ADS2008 (Agilent Advanced Design System 2008) is an excellent software platform for high frequency and high speed EDA manufacturing. In this letter, the modeling of microstrip filter which works at appointed frequency is got by transforming the lumped elements to microstrip elements. Finally, the microstrip filter simulated, optimized by ADS2008.
Fatigue Life Analysis of Shaking Table’s Exciting Beam Based on Finite Element Analysis
Authors: Gong Hai Bin , Su Jian , Zhang Dong Lin , Wang Li , Wang Xing Yu
Published: December 2011

With large scale increases of the train speed, the development of one reliability test bed which can simulate vibration environment becomes the extremely urgent task. The shaking table is one of key reliability test equipments, and its design and development is in needs immediately. The fatigue strength is basic design index of shaking table. Based on the load time history acquired by track spectrum, combined with finite element model of exciting beam and material properties, the fatigue life of exciting beam is predicted by Miner cumulative damage rule method in this paper.
OptiStruct Application in Optimization Design of Car Cabin Front Suspension Bracket
Authors: Sun Yong Hou , Yu Tian Chao , Sun Ying
Published: December 2011

Abstract. Car cabin front suspension bracket (CCFSB) plays a supporting role of cab which connected cab cabin and chassis parts. In the conventional design, CCFSB is large and heavy usually to ensure its design strength. Therefore, structure optimization design is becoming the focus on the design of CCFSB. To solve the problem, this paper presents a structure optimization design method of CCFSB based on HyperWorks. The “Analysis-OptiStruct-Refine-Analysis-Contrast” method is proposed to realize the structure optimization. By the process of “meshing-loading- calculating- view of results”, the result of structure optimization of CCFSB is got which shows materials distribution. Trough taking OptiStruct optimization, the weight of CCFSB is reduced about 39% but stiffness is increased. The performance of product is improved and the cost is reduced greatly.
Finite Element Analysis of Structural Safety of a Steel TV Tower
Authors: Sun Yi , Shu Xiang Dong , Yang Wen Qi , Zhao Qiao Rong
Published: December 2011

The steel truss TV tower structure, the height is 183.1 m, which is built in 1970, was corroded obviously. In order to ensure its structural safety, completely detection and security analysis have been implement. The tower is located in the top of the ridge, and hilly terrain effect was included in the whole structure analysis. Finite element analysis of bar elements was done to inspect whole structure safety. The results show, most of the members were safe, but with the height of 120 m, stress ratio of columns and diagonal braces is large than 1, and can’t meet the requirement of current codes. Additional solid finite element analysis of joint zone shows that, stress in very local area of connection plates reached to the yield stress, but they were safe enough after plastic stress redistribution. According to the results of corrosion depth test, the finite element analysis of structure after corrosion is done. After corrosion, the bearing capacity of columns almost reaches the limitation. The increase of any load or corrosion depth may lead to the failure of columns.
Creative Design of Mechanism Configuration Based on Genetic Program
Authors: Luo Xian Hai , Chen Tao , Xu Hong , Feng Hao
Published: December 2011

Used a nonlinear hierarchical tree data to describe the types of mechanism, and taken links as tree nodes, and mechanism as tree structure. According to the evaluation method of mechanism configuration design to define fitness function, driven by the fitness function, used the crossover, mutation, evolution of the genetic program to simulate the development of mechanism, therefore produced the types of mechanism which meet the design requirements, and realized the automatic creative design process of mechanism configuration.
Simulation Calculation of Tilting Torque for Mixed Iron Car
Authors: Li Ling Ling , Xu Guang Pu , Kang Yong Ling , Ma Xue Dong
Published: December 2011

Tilting torque of mixed iron car is an important parameter in designing tilting mechanism. In the past, calculating tilting torque of the mixed iron car mostly depended on manual calculation with low calculating speed and calculating precision. This paper adopts Solidworks software to simulate and calculate tilting torque of the 300t mixed iron car, and overcome the above drawbacks. According to the calculating, the tilting torque’s curve can be obtained, which provides a theoretical reference for determining power of tilting motor, designing tilting mechanism and judging the tilting safety.
Kinematics and Dynamics Simulation Research for Roller Coaster Multi-Body System
Authors: Xu Ge Ning , Xin Hu Jun , Lu Feng Yi , Yang Ming Liang
Published: December 2011

To assess the roller coaster multi-body system security, it is need to extract the running process of kinematics, dynamics, load spectrum and other features, as basis dates of the roller coaster structural design. Based on Solidworks/motion software and in the 3D model, the calculation formula of the carrying car velocity and acceleration is derived, and the five risk points of the roller coaster track section are found by simulation in the running, and the simulation results of roller coaster axle mass center velocity are compared with theoretical calculation results, which error is less than 4.1%, indicating that the calculation and simulation have a good fit and providing the evidence for the roller coaster structure design analysis.
Kinematic Analysis on Multi-Bar Linkage of Loader Working Device Based on Transformation Theory of Mechanisms
Authors: Zhang Fu Sheng , Xu Ge Ning
Published: December 2011

By using the traditional Assur Groups method analysis multi-bar linkage kinematics parameters with an advanced plane connecting rod, complex nonlinear equations should be solved. To solve this tedious and error-prone problem，The senior Assur Groups should be transformed into combination of second grade Assur Groups, virtual single component and constraints single component with the aid of the theory of senior Assur Groups transformation. The problem can be simplified. Based on the transformation theory of mechanisms, the eight-bar linkage working device of loader was analysised. The results showed the method could avoid the nonlinear equations, reduce the computation amounts and enhance the computing rate. It could be applied in various forms of senior Assur Groups
Piezoelectrics-Based Integrated Optical Waveguide for Mach-Zehnder Interferometer as the Modulator in Microwave Photonic Link
Authors: Ye Zhe Yu , Wang Zhi Yong
Published: December 2011

Microwave photonic link (MPL), which processes microwave signal with photonic technologies, has offered many advantages such as increased channel capacity, immunity to RF disturbance, reduction of size and weight, and low loss. External modulation of the MPL applies Mach-Zehnder interferometer (MZI) for the modulating. The traditional phase transitional behavior of the EO device lacks the performances required for quick response, low half-wave voltage V and high loaded power, while maintaining low noise, high SNR, and large dynamic range operation. This paper proposed a method in which the piezoelectric ceramic-based integrated optical waveguide with 3dB loss at the highest power was applied to the MZI. We built the physical model for the phase transitional behavior based on the piezoelectrics, analyzed the piezoelectric properties of ceramics. The impacts of the piezoelectric ceramic on the property of MPL were discussed numerically.
Simulation Analysis on Engine Radiated Noise
Authors: Xia Chang Gao , Zhang Zhen Yu
Published: December 2011

In this paper, in order to analyze and predict surface radiated noise, an engine with 6 cylinders is studied by advanced methods. The loads that the engine block is subjected and the modal participation factors can be obtained through multi-body dynamics calculation; by the finite element method, structural modes of the engine can be gotten; by the acoustic boundary element method and the modal acoustic transfer vector method, the acoustic responses on field points can be obtained. According to the simulation results, the acoustic power and the acoustic pressure distributions on field points and noise frequency characteristic can be identified when the engine is operating at different speeds, and the main noise source can be located. These results provide a reference for noise reduction and amelioration of the engine.
Numerical Analysis on Apeature of High-Pressure Water Jet Punching Hole to Preventing Outburst
Authors: Zhang Jia Yong , Gong Xue Min , Guo Li Wen
Published: December 2011

As impacting and cutting role of the small jet, coal around slots occured violent displacement and expansion, increasing coal cracks, which greatly improved gas flow in coal seams and made for gas emission. The original coal stress changed and stress concentration belt moved to coal seams depth constantly. With gradual relief expansion and fracture increased, coal seam permeability coefficient increased, gas pressure decreased. Coal potentiality released, coal crushed and moved, a lot of gas with adsorption state changed free, then gas fully released and gas pressure gradient decreased, which reduced outstanding risk. it was determined that aperture size was 4/15 or so of roadway floor length using ANSYS finite element analysis software, thus roadway fissures developed full, and maintained rock integrity, in favor of speeding up the face driving.
System Design on 3D Entity Non-Destructive Measurement Method
Authors: Gan Yong , Sun Ao Ran , Chen Jing
Published: December 2011

It discusses the measurement principle and the system design of 3D non-destructive measurement method for the homogeneous entity. The measurement project and its operating process is discussed. The basic operation principle and components of this measurement device are pointed out. It included the digitized minute entity cells and the delaminated measuring method for product profiles based on liquid. It is based on Archimedes' principle and lever principle and gravity moment, combined the equations of the gravity moment and the equations of the center of gravity, the 3D coordinate values of every minute entity cell in different layers can be reckon by computer. By inputting the 3D coordinate values of the product into the related CAD software system, the 3D model could be obtained. The principles, the system software were introduced in details about the measurement system of the homogeneous entity profiles. Proved through principium experiment, the system satisfies the request of the measuring precision. The measurement system is effective and feasible.
Study of the Process of Turbine Blade and Fixture Design Based on UG and ANSYS
Authors: Xin Jie Shao
Published: December 2011

This paper made an analysis on the process of turbine blade, and completed the three-dimensional design of milling and cutting fixture used in the process on the UG software. After the stress analysis of the workpiece is completed, the author made a finite element analysis on both the blades and the main parts of the fixture with the help of ANSYS software, the results of the research provide theoretical basis for the development of reasonable processing technology and reliable workpiece assembly.
Advanced Development Method of the Standard Fixel Library for Computer Aided Fixture Design
Authors: Qin Guo Hua , Zhu Hua Yu , Ye Hai Chao , Zhou Mei Dan
Published: December 2011

In order to efficiently design a fixture, it is necessary to establish a standard fixel library for CAFD system. Therefore, a SQL Server-based development technology is first employed to manage the parameterized fixel models. And then, in order to construct a fixel model, MFC is adopted to carry out the secondary development of Unigraph environment. Thus, arbitrary fixel can be dimension-drive designed according to a parameterized fixel model. The establishment of the fixel library can to a great extent reduce the trivial and repetitive tasks in the fixture design.
R&D of Picking-Up and Clearing Key Parts for the Type 4LQ-1.6 Line Chili Harvesting Machine
Authors: Liu Xiao Fei , Chen Yong Cheng , Wang Ya Ge
Published: December 2011

Picking-up and clearing parts are the key device of the important work parts for the line chili harvesting machine, which directly affect the performance of the harvesting machine. In this paper, the working principle of the picking-up and clearing parts for the type 4LQ-1.6 line chili harvesting machine were explained, the structures of them were designed and the technical parameters were demonstrated. The virtual prototype was designed based on the analysis of Pro/ENGINEER and the physical prototype was made after that. Through the field performance test, the results showed that the device can accomplish the joint work picking, the function of clearing with mining net rate, low broken rate, high efficiency and reliability.
Computer-Aided Multi-Domain Unified Modeling and Simulation for Aircraft Landing Gear
Authors: Zhu Yu Ming , Yang Hai Cheng
Published: December 2011

In order to model complex product systems and analyze their whole performance to deal with the coupling relationships between multi-domain，aircraft landing gear selected as the object, unified multi-domain modeling and simulation and for complex product systems was studied. The aircraft leading gear is decomposed as structure, and the mathematical models of the landing gear components are established. The model library of the landing gear components was developed using Modelica-based platform and multi-domain unified model of the landing gear was established. The impact work amount, the vertical load and the stroke are selected as the indexes to simulate and analyze the earthquake resistant performance of the shock absorber.
Development of CAPP Tools System Based on the Derivative and Retrieved
Authors: Yuan Zhi Hua , Wang Zhi Jun , Li Hai Wei
Published: December 2011

Making a CAPP system which has both practicality and versatility is still a problem to be solved. Aiming at this problem, an idea of developing an integrated derivative and retrieved type of CAPP tool system is presented, and combined with a development practice, the structure and some key technologies of the system is also introduced.
Reverse Design of Cam Contour Curve Based on BP Neural Network
Authors: Li Jian Wei , Wang Dong , Tang Yu Gui
Published: December 2011

To improve precision of reverse design in cam contour curve, method of using BP neural network was presented. The theory and algorithm of BP neural network were introduced, the principle and process of BP neural network modeling used in the reverse design of cam contour curve were expounded, and the actualize method of reverse design with modeled network was afforded. Experiment indicates that this method is suitable to reverse the contour curve of cam, and has high approach precision. At last, disadvantages of the method were discussed.
Study on Antibacterial and Antioxidant Activities of Salicornia herbacea Extracts
Authors: Yu Xiao Hong , Zhang Yu Qing , Shao Rong , Xu Wei
Published: December 2011

This paper researched the bacteriostatic of Salicornia herbacea (SH)extracts by method of spectrophotometry and plate culture, which showed Salicornia herbacea extracts have certain inhibition to both bacteria and streptomyces, and the inhibition rate to bacteria higher than which to streptomyces. At same times, this research studied the antioxidant of Salicornia herbacea extracts on peanut oil by iodometry. And the results showed that the POV (peroxide value) which added a certain amount of Salicornia herbacea extracts to peanut oil were smaller than the reference.
Design and Simulation of the Drill Groove Squeegee Roller's Profile
Authors: Wang Zhan Zhong , Cheng Lin Zhang , Zhang Wei , Wang Wei Jie
Published: December 2011

Based on the method of vector analysis, the mathematical model of squeegee roller for twist drill groove was setup. At the same time, the parameter design and simulation software for the profile curve of drill groove squeegee roller was developed with Visual C++ Language. The simulation results showed that the mathematical model of squeegee roller was right, and the design accuracy and efficiency of the twist drill squeegee roller was improved greatly.
Information Network of C-L PLM Based on the Internet of Things
Authors: Luo Yong Shun , Yang Yong , Li Yu Zhong , Wang Xiao Jun
Published: December 2011

Closed-Loop PLM is the development direction of product management in the future. Network platform is the indispensable means for realizing closed-loop. It could be concluded that the Internet Things can be the network platform of C-L PLM by analyzing the circulation data, data distribution, and hardware and software configuration. The connection method of EPCglobal network and C-L PLM was designed, based on analyzing them belonging to the same standard frame.