bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Anti-Erosion Mechanical Properties of Steel Structure Coating
Authors: Hao Yun Hong , Li Li , Zhong Zuo Wei , He Xiao Yan
Published: February 2011

Steel structures are seriously affected by sandstorm in the central and western regions of Inner Mongolia, this influence is mainly reflected erosion damage to the steel structure coating by sandstorm. As the coating has critical protection role to the durability of steel structure, the damage of coating will directly lead to reduce durability and safety of steel structure system. This paper researches on the anti-erosion mechanical properties of steel structure coating materials, and measures hardness, modulus , thickness and density of the coating by use of micron-indenter and traditional methods, the result shows that hardness is 2.1516MPa, modulus is 15.62MPa, thickness distribution is in the 800um ~ 1000um and density is 1.71g/cm3. This research result will provide the basis for preparation of anti-erosion coating and evaluation safety and durability of steel structures.
Enhanced Wear Resistance of Al-15Si and ZK60-1Y Mg Alloys Induced by High Current Pulsed Electron Beam Treatment
Authors: Gao Bo , Hao Yi , Tu Gan Feng , Li Shi Wei , Hao Sheng Zhi , Dong Chuang
Published: February 2011

High current pulsed electron beam (HCPEB), a novel high-power energetic beam technology, has been developed as a useful tool for surface modification of materials. In the present work, the effect of HCPEB treatment on microstructure and wear resistance of Al-15Si and ZK60-1Y Mg alloys was investigated. The results show that a supersaturated solid solution of (Al) and (Mg) is formed on top surface of melted layer induced by rapid heating and cooling during HCPEB process. In addition, the melted layer of approximately 5~11μm thickness is obtained on the ZK60-1Y Mg alloy surface. Wear resistance of Al-15Si and ZK60-1Y Mg alloys are significantly improved after HCPEB treatment. It is demonstrated that HCPEB technology has a good application future in enhancing surface properties of Al-Si and Mg alloys.
Grinding Performance of Permeated Grinding Wheel
Authors: Li Wei , Hu Bin , Ma Ming Ming
Published: February 2011

The permeated grinding wheel was a new kind of grinding wheel, which was permeated by the chemical additives and solid lubricant into the interior gaps of the grinding wheel. Therefore, the grinding wheel can form a lubrication film on the surface of the grinding wheel. This grinding wheel has some good features, such as lower grinding temperature, smaller grinding force, higher life of the grinding wheel, and can prevent the adhesion of chip onto the grinding wheel surface. The experimental results indicate that the ground surface quality and grinding efficiency have been remarkably improved for more hard-to-cut materials.
Research on the Mathematical Model for the Price Regulation of Power Demand-Side
Authors: Zhang Xiao Hong
Published: February 2011

Power Demand-side Management (DSM) originated in the USA and was introduced into China later. As China's rapid economic development, social electric power energy demand is increasing, therefore, strengthen DSM, using reasonable price regulation and guide consumers the rational allocation of electricity methods and structure, so that we can achieve efficient use of power resources. From the perspective of electricity consumers and suppliers, this paper analyzed the relationship between them by constructing mathematical model, expected to provide some theoretical basis and practical guidance for the practice of government and power companies.
Modification of the Flax Fiber with Acetylation
Authors: Sun Ying , Gao Shu Zhen , Zhang Ji Fang
Published: February 2011

The effect of acetylation modifying pretreatment of the flax fiber properties was researched．By the acetylation, the property and spinning ability of flax technical fiber have been largely improved．It can be used in cotton system processing to develop superior quality and diversified flax products．In this paper, it uses the orthogonal experiment to modify the flax fiber with acetylating. Through testing the physical mechanical properties of the flax fiber，the influences of the modified condition, such as the caustic soda density，infusion time，acetate density and acetylating time are optimized[1]. So that the fiber can be modified to improve spinning performance to meet high-production high-end linen and meet the requirements of thin fabric.
Study on the Brush Plating Technology of GH34 Heat-Resisting Steels
Authors: Li Jian Xia , Guo Bi Xin
Published: February 2011

Brush plating has been an important technology for the mending of the scratched surface of the engineering parts. The heat-resisting steels are common used heat-resisting material in aviation. The process for brush plating mending of deeply scratched surface of the parts made by heat-resisting steels is introduced, the technologic methods of heat-resisting steels are studied and analyzed, the merits of the brush plating mending technology of GH34 heat-resisting steels are discussed in this article．
Evolution of Crystalline Phase and Morphology of the Products Formed during the Hydrothermal Synthesis of Y2O3 Powders
Authors: Wang Ying , Zhao Gao Yang , Yuan Li
Published: February 2011

The crystalline phase and morphology of the products formed during the synthesis of yttrium oxide via the hydrothermal treatment yttrium nitrate were characterized by X-ray diffraction, transmission electron microscopy and scanning electron microscopy. Products with high OH/NO3ratios are formed with the increasing of hydrothermal treatment. The crystalline phases are evolved from Y2(OH)5.14(NO3)0.86•H2O toY4O(OH)9(NO3) and finally Y(OH)3. The hydrothermal reaction conditions play an important role in the synthesis of the microstructures. Results show the particle size and ﬁnal morphology of samples could be controlled by reaction temperature, reaction time, and OH-concentration. Sheets, hexagonal and needle-like Y2O3powders are obtained with the hydrothermal treatment of yittrium nitrate at 180 oC to 200oC for 2-8 hours at pH 9-13.
Comparative Study of Friction and Wear Behavior of Diamond-Like Carbon Coating under Various Lubricants
Authors: Wu Li Ning , Feng Xin , Xia Yan Qiu , Hao Jun Ying
Published: February 2011

The friction and wear properties of AISI 52100 steel and DLC coatings were evaluated while being lubricated with silicone oil, PAO and PAG lubricants by using a reciprocating ball-on-disk sliding UMT tester. The morphologies of original surface and worn surfaces for the DLC and Ti doped DLC coatings were observed by using a scanning electron microscope. The results show that the DLC coatings have better tribological properties than AISI 52100 steel under silicone oil, PAO and PAG lubrication conditions. In addition, the DLC coatings have much better wear resistance than the AISI 52100 steel.
Design of Scanning Micro-Arc Oxidation Forming Ceramic Coatings on 2024 Aluminium Alloy
Authors: Lv Peng Xiang , Chi Guan Xin , Wei Dong Bo , Di Shi Chun
Published: February 2011

Micro-arc oxidation (MAO), also called plasma electrolytic oxidation (PEO), anodic spark deposition (ASD), or micro-arc discharge oxidizing (MDO), is an effective surface treatment technique which come from anodic oxidation technology. Via increasing the anodic voltage breaking through faraday area to a high stage accompanied by micro-arc discharge phenomenon, It indicated the ceramic coatings thickness increase along with the scanning times increase, while the thickness increment reduces. The phase composition, morphology and element distribution was studied by X-ray diffraction, scanning electron microscopy and line scanning. The morphology of the ceramic coatings shows it divided into compact layer and loose layer. And it composes of α-Al2O3 and γ-Al2O3.
Study on the Prediction of Surface Roughness of ZTA Ceramics under Ultrasonic Assisted Grinding
Authors: Yan Yan Yan , Liu Jun Li , Zhao Bo
Published: February 2011

By means of Adaptive Neural-Fuzzy Inference Systems(ANFIS), the prediction model of surface roughness of zirconia toughened alumina ceramics (ZTA ceramics) under ultrasonic assisted grinding is established, and the model may obtain the higher forecast precision (81.25%) by dealing with nonlinear problem among grinding parameters, and fuzzy rule curved face formed by prediction model showed four input factors have different influence on surface roughness Ra, and they are abrasive grain size, grinding method, grinding depth, axial feed and speed of worktable from top to bottom. So the prediction model provides a new and efficient method for intelligent information processing, and it could be applied in modeling and real-time control etc, and it is possible to be widely applied in engineering.
Preparation and Electrical Properties of Aligned Carbon Nanotubes/Epoxy Resin Composites Induced by a Low Magnetic Field
Authors: Zhang Yu , Ma Chuan Guo
Published: February 2011

Aligned carbon nanotubes(CNTs)/epoxy resin(EP) composites were prepared under a low magnetic field (B<500mT) induction. The effect of different magnetic fields on the electrical and dielectrical properties of composites was investigated. The results show that the CNTs are aligned with rod-like aggregations instead of single CNTs when the magnetic field direction is vertical to the casting direction of samples, then electric conductivity, permittivity, dielectric loss of the composite are improved. And a larger magnetic field intensity and a bigger mould capacity can help the effect of magnetic field induction. However the CNTs are seriously aggregated and the electrical properties of composites change worse when the magnetic field direction is parallel to the casting direction of samples.
Microstructure and Creep Properties of Casting Mg-8Al-0.3Mn Alloy Containing Ca and Sr
Authors: Lou Yan , Li Luo Xing
Published: February 2011

Microstructures and creep properties of AM80 alloy with calcium and strontium additions have been investigated by using OM, X-ray diffraction, SEM and creep tests. The results indicate that the as-cast microstructure of the AM80 alloy consists of the α-Mg matrix, bones-shaped Mg17Al12 and lamellar second precipitation phase at grain boundaries. Calcium and strontium can refine the grain size and the secondary phases. Calcium addition results in the formation of a fishbone Al2Ca eutectic phase in AM80 alloy. With the increase of calcium, reticular Al2Ca phase distribute at the grain boundaries. The creep resistance of the AM80 alloy is significantly improved by a small amount of strontium and calcium addition due to the formation of a grain boundary network consisting of the high melting point Al2Ca phase. Microstructure observations performed on the sample after creep testing reveal that the phase is distorted during creep, reflecting its formation in the as-cast microstructure is unbeneficial to creep properties of the AM80 alloy. The creep resistance of the alloy at elevated temperatures was remarkably increased when calcium was added combined with strontium. The highest creep resistance was obtained from the alloy with xSr and y3Ca addition and its steady state creep rate reached as low as 3.941×10-8s-1, one order of magnitude lower than that of alloy AM80 without strontium and calcium additions.
Topological Synthesis of Fully Decoupled Parallel Manipulators by Screw Formulation of Jacobian Matrix
Authors: Zhang Fan , Zhou Ze Bin , Yang Jian Guo
Published: February 2011

A family of spherical parallel mechanisms which have fully decoupled motions is presented in this paper. The condition required for synthesizing the fully decoupled parallel mechanism is derived from the screw formulation of Jacobian matrix. According to this condition, several novel decoupled spherical parallel mechanisms are obtained. The decoupled motions are validated by the simulation of the prototype of spherical parallel mechanism.
Research on Producation of a New Type of Biological High Molecular Material Poly(γ-Glutamic Acid)
Authors: Yang Ge , Ning Wang , Zhang Chao
Published: February 2011

Poly-γ-glutamic acid (γ-PGA) is a kind of water-soluble and biodegradable polymer, as a potential targeted biopolymer that can be refined from biomass directly. In this work, the effect of environmental parameters on γ-PGA formation by Bacillus licheniformis is investigated . The influence of culture temperature, pH and culture time on cell growth, γ-PGA production and molecular weight, polymer stereochemistry are determined. The γ-PGA yield is higher(30.13g/L) at culture temperature 37 , pH 7.0. Alteration of the medium pH, temperature, culture time and aeration had little to no significant effects on the product quality as measured by stereochemical composition. But alteration of the medium pH, temperature, culture time and aeration have obvious effects on the γ-PGA yield and molecular weight, increasing the biomass and γ-PGA yields. Under the optimal environmental conditions yields of γ-PGA in excess of 36g/L is obtained in submerged culture. Finally, the large-scale fermentation of γ-PGA production was successfully scaled up to a 100-l fermentor, with the highest γ-PGA productivity for over 57.5 g/l.
The Wavelet Analysis and Processing of Weak Vibration Signal
Authors: Xu Ze Ning , Liu Hong Yu , Zhang Yong Guo
Published: February 2011

Signal measuring is an important link in machine fault diagnosis. Accurate and reliable fault signals can be achieved by reasonable signal measuring. When the distance between sensor and measuring gear or bearing is comparatively far, the collected signals became weak and disturbed by other vibratory signals in equipments on bearing and gear fault analysis. Useful signals often were submerged in powerful noise, so caused difficult in extracting fault feature. In this paper, according to the feature of vibratory signals in machine test, wavelet analysis basic theory was applied on researching basic feature of wavelet analysis. By selecting suitable wavelet function and applying wavelet elimination noise technology the signal to noise ratio of signal was raised, thus the vibratory impact component can be measured in weak signals. Finally, wavelet analysis was applied on bearing fault diagnosis.
Numerical Analysis of Micro-Mixing in Rough Microchannels
Authors: Yang Da Yong
Published: February 2011

Understanding the micro-mixing of electroosmotic ﬂow is of both fundamental and practical signiﬁcance for the design and optimization of various microﬂuidic devices to control ﬂuid motion. In this paper, the governing equations of the micro-mixing in rough microchannels with rectangle surface roughness are solved using the finite element method and the effects of roughness height and space on mixing efficiency are investigated. The results indicate that the effects cannot be ignored and the mixing efficiency increases with the roughness element height and density.
Influence of Parameter Identification of Anisotropic Yield Function on Spring-Back Prediction in Finite Element Simulation of Sheet Metal Forming Process
Authors: Zang Shun Lai , Teng Lai , Guo Chen
Published: February 2011

The anisotropic plastic behavior of metallic sheet has a significant influence on spring-back, and is usually modeled by anisotropic yield function in numerical simulation. Material parameters of anisotropic yield function are generally identified either by yield stresses or by r-values, or both of them. For Hill1948 and Yld89 anisotropic yield functions, r-values are still widely used to calibrate their material parameters in spring-back prediction. Here, yield stresses and r-values were respectively used to calibrate them, and the differences of the spring-back simulated by these two identification methods were discussed. To evaluate their accuracy, the simulation results were compared with the spring-back calculated by Yld2000-2d anisotropic yield function. The result shows that when yield stresses were used to identify the material parameters of Hill1948 and Yld89 yield functions, the simulated spring-back was closer to that of Yld2000-2d yield function.
Design Thermal Structure of Aluminum Plate LED
Authors: Liang Li Li , Yang D.G.
Published: February 2011

The proportion of LED in the lighting area gradually increased. But its high price, the low luminous efficiency, reliability problems restricted its global application. Therefore, for reliability problems, design a thermal structure of 19.2W multi-chip on board aluminum plate LED. Enhance the reliability mainly by settle a piece of silicon between the aluminum plate and the chips. Analyze by finite element method and use the ANSYS simulation software, the simulation for the thermal field is performed. Identify the optimal combination of structural parameters by using the orthogonal experimental method. The maximum steady-state temperature is less than 53.69 °C. Analyze the thermal-structure coupling simulation of the optimization of the thermal structure and reach the maximum thermal stress of 144MPa. So we can say that heat stress in terms of the design is safe and reliable. Eventually arrive at a more ideal LED aluminum plate thermal structure.
Effect of Surface Roughness on Slip Resistance of Rubber
Authors: Jia Li Xiao , Zhang Yong Zhen , Niu Yong Ping , Du San Ming , Li Jian
Published: February 2011

In order to decrease accidents of slips and falls, COFs of rubber samples with different surface roughness were measured by Brungraber Mark II. And the correlation coefficients between roughness parameters and COF were calculated. The rusults have shown that the COF increases with surface roughness and the correlation coefficient between Sq and COF is highest. In general, almost all the roughness parameters used in the study have high correlation with COF. Parameters had the highest correlation with COF depends on the materials used and test conditions.
Finite Cylindrical Shell Element Method which Analyses Local Stability of Buried Stiffened-Penstock
Authors: Ma Wen Liang , Ji Dong Yu , Zhang Jian Hua
Published: February 2011

This paper adopts semi-analytical finite cylindrical shell element method to research the local stability of buried stiffened-penstock, and considering the influence from initial interstice and stiffener ring. Displacement model of cylindrical shell element is established, elastic stiffness matrix and geometric stiffness matrix of the element is deduced, in the process of deducing formula, using sectional suppose and result which is adopted in the process of deducing Amstutz formula. Calculation results show that, Calculating local stability of buried stiffened-penstock by semi-analytical finite cylindrical shell element method has good convergence. This paper provides an new method for local stability analysis of buried stiffened-penstock.
A Multiple View Assembly Process Representation Based on Three Dimensional Models
Authors: Qiao Li Hong , Zhu Yi Xin
Published: February 2011

In order to effectively represent assembly process information based on three dimensional (3D) models and rapidly extract the necessary information for assembly process planning, analysis and simulation, this paper aims to research the multiple view representation of assembly process information based on 3D models. Assembly process information based on 3D models is summarized and considered as the single source of the multiple view representation. The definition and organization of assembly process view is defined to implement assembly process representation based on view. Assembly process views based on assembly process planning work flow are established. View mapping approach is investigated to rapidly extract the necessary information for assembly process planning, analysis and simulation. The use of the multiple view assembly process representation is illustrated by building detailed assembly process view and assembly process simulation view and by extracting relevant information for the assembly process simulation view from detailed assembly process view.
Water Vapor Cooling Effects in Turning by Finite Element Modeling
Authors: Yang Fan , Huang Jian Long
Published: February 2011

In order to correctly analyze the effect of water vapor cooling in metal cutting process, the turning process of AISI 1045 in the water vapor cooling condition is simulated using a commercial finite element software Deform-2D, including geometric modeling, meshing, boundary condition setting and material modeling, etc. The cutting temperature in different cooling conditions are then analyzed and discussed. The experimental validation showed a good agreement with simulation results. Thus, FEM simulation of cutting process can be considered as a promising and reliable tool for machining development within the near future.
Study on Friction Wear Properties of Vanadium-Chromium Surface Composite Layer under Dry Sliding Condition
Authors: Wang Ying , Zhang Yong Hong
Published: February 2011

Vanadium-Chromium composite layer is formed on the surface of cast steel by the method of V-EPC cast penetration. The dry sliding friction wear properties of composite layer are studied on MM200 friction wear testing machine in this paper. The wear surface feature of samples is also observed by SEM and the wear mechanism of samples is analyzed. The result has shown that comparing with the matrix, the wear resistance of composite layer is advanced evidently. The wear rate of composite layer is only eighth to matrix. With the increase of load and the decrease of Vanadium iron in penetrating regent, the wear rate of composite layer increase. The mechanism of composite layer is mainly oxidation and fatigue flake produced by the initiation and expansion of crack.
Application of Repair and Anti-Corrosion Technology on Reinforced Concrete Structures of a Domestic Wharf
Authors: Zhao Xiao Dong , Fan Xi Qiu , Tian Mei Ling
Published: February 2011

According to the status and service environment of a domestic wharf, the corrosion of reinforced concrete structure was evaluated by multiple detection methods, on the base of which the corresponding repair and anti-corrosion program were adopted, thus good preservative effect was achieved. The research work and demonstration project are expected to provide technical discussion and reference for peer experts, as well as technical basis for the corrosion protection of reinforced concrete structures in similar marine environment.
Analytically Study the Ferrohydrostatic Pressure with FHD Bernoulli Theory
Authors: Ho Je Ee
Published: February 2011

The ferrohydrostatic pressure is an important magnetization characteristic for the ferro-fluid used as the working medium of shock absorber or as a leak-proof dynamics seal of rotating shaft. To generalize and analyze the experimental results, an analytic formulation of magnetic pressure derived from the Ferrohydrodynamics (FHD) Bernoulli theory is constituted. Meantime, an auxiliary testing mechanism on the magnetic levitation, features as an easy, economical and efficient utility, is then set up in this study and which is quit different from the expensive cost required in precise VSM measurement system. While compared with above results, a good agreement will be accessed within the working interval of magnetic flux 0 ~ 60 mT.
Theoretical Study of the Effect of (F, Li) Codoping on P-Type Tendency in ZnO
Authors: Xiong Zhi Hua , Chen Lan Li , Wan Qi Xin
Published: February 2011

Based on the first-principle calculations, we present a study for p-type ZnO doping. The calculated results show that (F, Li) codoping can suppress the formation of interstitial Li because the formation energy of FO-LiZn is lower than that of FO-Lii under O-rich condition. However, it is also found that FO-LiZn codoping could not realize p-type ZnO because FO-LiZn forms a fully passive complex. Interestingly, we further find FO-2LiZn is a stable acceptor that has lower formation energy and shallower transition level under O-rich condition. We expect this study might be helpful for synthesizing good p-type ZnO by controlling (F, Li) codoping.
Analysis about Vibration and Noise of Ceramic Electrical Spindle
Authors: Wu Yu Hou , Zhang Li Xiu
Published: February 2011

High speed machining (HSM) technology is used in a broad range of applications to machine ferrous metals and nonmetallic material. The electrical spindle is one of the major elements to keep the machine running at high productivity. In recently years, the requirement of rotational speed and rigidity of electrical spindle is getting higher and higher in order to satisfy the high speed processing. So a high speed grinding electrical spindle equipped with hot isostatic pressed silicon nitride (HIPSN) fully-ceramic ball bearings without inner rings and yttria partially stabilized tetragonal zirconia polycrystal (Y-TZP) ceramic spindle shaft is designed for higher speed and rigidity. Because the processing precision is relevant to the vibration of electrical spindle, it is necessary the vibration and noise of the ceramic electrical spindle is detected. This paper presents results of vibration and noise of the ceramic electrical spindle and analysis the reason of phenomenon. The analysis shows the vibration and noise of the ceramic electrical spindle is up to the standard.
Research in Vacuum Diffusion Bonding of Ti-6Al-4V Alloy and Type 25 Low Carbon Steel
Authors: Huang An Guo , Huang Wei , Liu Jing Fu , Zhang Hu , Yu Wei , Li Zhi Yuan
Published: February 2011

To analyze the feasibility about diffusion bonding of Ti-6Al-4V alloy (represented by TC4 below) and type 25 low carbon steel (represented by 25-steel below), two kinds of experiments have been conducted by Gleeble-1500. One is directly diffusion bonding research of TC4 and 25-steel, the other is diffusion bonding of TC4 and 25-steel with adding Ni intermediate layer. The surface microstructures and the phase composition of bonding Joint have been systematic analysis through scanning electron microscope (SEM), energy spectrometer and XRD. Results indicated that the Ni intermediate layer largely improve the strength of joints observably, by suppressing the harmful diffusion between two sorts of based metal to avoid the appearance of harmful intermetallics in the joints.
Effect of Rare Earth on Microstructure and Impact Toughness of Low Carbon Steel Based on Compact Strip Production Process
Authors: Wang Hai Yan , Ren Hui Ping , Jin Zi Li , Zong Cui
Published: February 2011

The effect of rare earth (RE) on microstructure and impact toughness of hot rolled low carbon structure steel based on the Compact strip production (CSP) process was investigated in this work. Scan electron microscope (SEM) were employed to characterize the microstructure and analyze the fracture surface. Moreover, hot compression experiments were also adopted on the Gleeble-1500 hot simulator as well. The results indicate that acicular ferrite and/or ultrafine ferrite morphologies can be induced when an appropriate amount of rare earth added into the low carbon steel, which possessed the satisfied strength and toughness behaviors. Compared with commercial low carbon structural steels, the additions of RE can improve dynamic recrystallization critical strain of low carbon structural steel as well. In addition, the role of RE on the formation of these acicular ferrite morphologies has been investigated.
Surface Grinding Force Model of Steel 55 Based on Undeformed Chip Thickness with CBN Electroplated Wheels
Authors: Wang Jun Ming , Ye Ren Zhen , Chen Hui Peng , Bin Hong Zan
Published: February 2011

Undeformed chip thickness is one of the most important parameters in grinding process, which is related to the entire abrasive grains in grinding simultaneously and changed periodically with time. Simplifying the geometric shape of abrasive grains ,the paper modifies the mathematic models of undeformed chip thickness by analytic method, establishes an universal calculation model of grinding force based on undeformed chip thickness, then optimizes the parameters of the model by restrictive random direction method according to the measuring experiments of the inter-grain spacing about CBN electroplated wheels and the grinding experiments of steel 55 during surface grinding, analyses the influence factors of the friction ratio on the grinding force. The results show that under the same grinding depth， both of the ratio and the grinding force will be decreased with the increase of velocity ratio VS/VW, but the ratio increases and the grinding force decreases with the increase of inter-grain spacing.
Anslysis of the 5-m Heavy Plate Mill Stand Based on MSC.Marc Finite Element Method
Authors: Huang Zhen Yi , Chen Min Xia , Li Chang Hong , Wu Sheng Fu , Wang Wei , Liu Jian , He Da Lun
Published: February 2011

The stand is the largest and most important part in rolling-mill components.It bears tremendous rolling force, instant impact and part of the rolling torque during the rolling process .In addition ,roller system ,pressure and balance system also installed in it. Therefore, rolling mill must be equipped with sufficient strength and stiffness to ensure the safety of mill equipment and accuracy of the size of products. In this paper, It uses the finite element simulation software MSC.Marc to simulate and analyze the 3-D finite 5-m heavy plate mill housing of Baosteel . which can provides effective theoretical basis to the optimization of technology establish and the safety of equipment. The simulation results can be used to verify the accuracy of stress and strain field measured data for the mill frame, It also can infer parts of rolling mill which is not detected and unpredictable of the stress and strain states, and further to learn about weak parts of frame in stiffness and strength facets.
Research on Performance Characteristic of Novel Fomichev Plug Used in Julong-Type Piercer
Authors: Li Sheng Zhi , Hu Lan Wei , Yin Yuan De , Ding Bo , Meng Wen Hua , Wang Peng Zhan
Published: February 2011

The novel Fomichev plug described in this paper is of characteristic producing equal unit-reduction of wall thickness along its perforation section during seamless tube piercing, which designed on the base of the roll opening of Julong piercer, taking into account for both feed angle and toe angle of a cone type piercer. Then a 3-D thermal-mechanical coupled numerical simulation on performance characteristic of novel Fomichev plug is presented with the aid of commercial FE code MSC.SuperForm, according to practical process parameters of piercing and rolling for steel grade P91 on Julong piercer in Yangzhou Chengde Steel Pipe Co., Ltd. By comparison with conventional plugs, as FE simulation result shows that the new plug reduces the damage value of the workpiece, thus decreases the tendency of lamination defects. What’s more, the axial resistance of novel Fomichev plug is smaller than the conventional, which is in favor of biting condition and increases piercing efficiency. Furthermore, the newly-designed plug’s temperature field is more uniform, which can alleviate failure of piercing plug caused by overtop local temperature, prolong its working life, and improve the quality of hollow shells.
Virtual Prototype Design and Dynamic Simulation of High-Dump Truck Based on ADAMS
Authors: Li Xu Rong , Yuan Ding Xin
Published: February 2011

The paper sets up a virtual prototye modeling for a high-dump truck and has dynamic simulation for this modeling.At the same time,it analyses the related results.The high-dump truck adopts the scissor lifting mechanism to upgrade the compartment smoothly. The lifting mechanism and the median installation of fuel tank in the flip institutions are novel. The simulation analysis results of ADAMS confirm the feasibility of this design and make some proposal for the rationality of the median installation of fuel tank.
Finite Element Analysis of RPC-Filled Steel Tube Stub Columns
Authors: Luo Hua , Yan Zhi Gang , An Ming Zhe
Published: February 2011

Reactive Powder Concrete (RPC) is a kind of cement-based composite which has ultra-high strength, high ductility and durability. RPC has great fragility, bad ductility and bursting fragility destruction subjected to high or complicated stress. The fragility performance of RPC will be improved when RPC is cast in steel tubes. The behavior of axially loaded RPC-filled steel tube circular stub columns is presented in this discussion according to the experiment and finite element analysis. An accurate finite element model was developed to carry out the analysis. Accurate nonlinear material models for confined concrete and steel tubes were used. The results obtained from the finite element analysis were verified against experimental results.
Fatigue Analysis of Planet Carrier Based on Collaborative Simulation
Authors: Liu Hong Mei , Zhao Li Juan
Published: February 2011

The fatigue analysis of planet carrier of shearer cutting unit was carried out based on collaborative simulation technology. Through co-simulation, the fatigue cloud of planet carrier was obtained, which provided a basis for planet carrier structural optimization and improved the planet carrier reliability.
Wear Mechanisms Approach to Ni-P Electroless Plating Applied to Hardening Engine Cylinder
Authors: Sun Jianmin , Yang Qing Mei
Published: February 2011

For practical operation conditions of engine cylinder, piston speed and lateral pressure to cylinder wall are determined as experimental factors. According to load and speed on 1mm~8mm below top dead center of cylinder in expansion stroke, the ranges of experimental parameters are chosen. Based on the quadratic regression rotation combination method, wear resistance experiment of hardening material is designed. The wear mathematic models of Ni-P electroless plating is established, and three-dimensional curved surfaces for load-speed-wearing value are drawn. The results show that the Ni-P electroless plating can increase relative wear resistance of cylinder by 5 times. By analysis of wear mechanisms of hardening material and wear resistance, the material is perfect for hardening engine cylinder wall.
3D Finite Element Modeling of the Machining of Ti6Al4V Alloys
Authors: Yang Ji Hong , Sun Shou Jin , Brandt Milan , Yan Wen Yi
Published: February 2011

A 3D finite element model of the machining of Ti6Al4V alloy has been developed. This model is able to simulate the formation of continuous or discontinuous chips during the cutting process that depends on the cutting conditions. In this model, the yield stress is considered as a function of the strain, the strain rate and the temperature. The dynamic effects, thermo-mechanical coupling, constitutive damage law and contact friction are taken into account. The stresses and temperature fields, chip formation and tool forces are obtained at different stages of the cutting process.
Identification Algorithm for Instantaneous Engaged Cutting Edge Elements in Five-Axis Milling
Authors: Huang Ze Hua , Li Jian Yong , Cai Yong Lin , Fan Wen Gang
Published: February 2011

An identification algorithm for instantaneous engaged cutting edge elements in five-axis milling is presented in this paper. An application of curve and surface intersection is used for filtering the engaged cutting edge elements roughly on any cutter location (CL) point at any machining time. And then the real engaged cutting edge elements can be further selected with computing entrance angle and exit angle of every axial disk element. Based on envelop theory, the swept feature-line can be calculated. According to the swept feature-line, entrance angle and exit angle of every axial disk element can be obtained in the cutter coordinate system. The validity of the algorithm mentioned above is verified by examples with various cutting depths.
Application of Digital Close Range Photogrammetry in Mechanical Three-Dimensional Modeling
Authors: Zhao Hu , Wang San Gen , Wu Da Ke
Published: February 2011

It is usually a time-consuming process to set up three-dimensinal(3D) model of mechanical components with complex surface. In order to solve the problem, this paper adopts consumer cameras and the technique of digital close range photogrammetry ( DCRP ) to establish 3D model, and export the data to 3D mechanical design software (SolidWorks) for further simulation and reconstruction. This method has been proved very effective in practise.
Analysis on Combination of Different Wavelengths in Surface Roughness Measurement by Polychromatic Laser Speckle Patterns
Authors: Huang Jing , Zhang Jian Wei , Zhang Yan Hua , Yuan Zong Heng
Published: February 2011

Based on the method of polychromatic speckle autocorrelation measuring surface roughness, this paper discussed the influence of the combination of different wavelengths on speckle patterns and speckle elongation ratio when rough surface and polychromatic speckle patterns were simulated. The results show that the smaller the difference of wavelengths combination is, the further peak of the speckle elongation ratio is from the speckle field centre, for the same surface roughness. And the wider area of speckle elongation effects extends. Therefore, influence of combination of wavelengths on measurement precision should be taken into consideration during measuring process.
Temperature Stress Field Distribution Study of Asphalt Carrier’S Based on Rockwool Damaged
Authors: Xie Yong He , Wang Wei , Li Gang Qiang
Published: February 2011

The rockwool has excellent thermal insulation performance, makes the hull structure and high-temperature asphalt effective isolation. But asphalt carrier’s temperature stress field distribution will be impacted once the rockwool damaged, so the rockwool damage factors are interested. The finite element model of cargo hold and rockwool are created in the present paper, the temperature stress field distribution is concerned with different boundary conditions and material properties.
Improving Pattern Recognition Rate by Gaussian Hopfield Neural Network
Authors: Chuang Shang Jen , Chen Chiung Hsing , Kao Chien Chih , Liu Fang Tsung
Published: February 2011

English letters cannot be recognized by the Hopfield Neural Network if it contains noise over 50%. This paper proposes a new method to improve recognition rate of the Hopfield Neural Network. To advance it, we add the Gaussian distribution feature to the Hopfield Neural Network. The Gaussian filter was added to eliminate noise and improve Hopfield Neural Network’s recognition rate. We use English letters from ‘A’ to ‘Z’ as training data. The noises from 0% to 100% were generated randomly for testing data. Initially, we use the Gaussian filter to eliminate noise and then to recognize test pattern by Hopfield Neural Network. The results are we found that if letters contain noise between 50% and 53% will become reverse phenomenon or unable recognition [6]. In this paper, we propose to uses multiple filters to improve recognition rate when letters contain noise between 50% and 53%.
Optimization Design of Ride Comfort for Wind Blade Transporter
Authors: Jiang Yong , Shi Bo Qiang , Jiang Zhi , Hao Zhi Jun
Published: February 2011

The wind blade transporter, a vehicle transporting wind blade, is a new product required by the market. It is supposed to have high level of ride comfort as required by the special load it carrys. Mathematical model of optimization of transporter ride comfort is established with sum of the acceleration RMS of blade centroid and wheel relative dynamic load as objective function. The wind blade transporter is taken as an example while SQPM is used as the optimization strategy. The results show that the ride comfort and operation safety of the transporter could be improved when the inflatable pressure and volume and stiffness of damping device are adjusted.
Numerical Analysis of Coupled Finite Element with Meshfree in Bulging Process of Sheet Elastic Flexible-Die Forming
Authors: Wang Zhong Jin , Yuan Bin Xian , Liu Jian Guang
Published: February 2011

Sheet flexible-die forming processes have been playing a good application on sheet metal forming in the industry field. Because of the coupled deformation between sheet metal and flexible-die, it is necessary to utilize numerical simulation technology to analyze it. In this paper, a numerical analysis method for coupling the deformation of sheet metal and flexible-die is developed. The deformation of sheet metal is analyzed with finite element method (FEM) and the bulk deformation of flexible-die is analyzed with the Element free Galerkin method (EFGM). The sheet flexible-die bulging process is analyzed with the developed FEM-EFGM method. This paper proposes a suitable numerical method to analyze sheet flexible-die forming.
Study on Thermal Stresses of Cylinder Liner’s Fabrication Using FEM Analysis
Authors: Huang Zi Qian , Xie Qing Lian
Published: February 2011

In the process of casing casting, great temperature gradient leads to contraction deformation of cylinder liner, which influences the quality of products. The thermal stresses caused by temperature gradient were analyzed by finite element method. The numerical results show that high equivalent Von Mises stress(242MPa) occurs in the surface zone of the cylinder liner as Cooling down to room temperature within pipe die ,also there is plastic deformation in the internal and external surface zone. Reducing the cooling speed, decreasing the temperature gradient and aging can reduce the influence of thermal stresses.
Space Robot Self-Assembling Dynamics and Control
Authors: Liang Lei , Liu Tian Xi , Cheng Wei , Zhao Yang
Published: February 2011

In the space robot self-assembling process, the assembling control becomes quite complicated and important for the nonlinear characteristics, which are caused by the dynamic coupling between the arm and the base, and the collision between the target and the assembling hole on the base. The dynamic model of the space robot with target is established firstly, then the Hertz model is introduced as the collision model between the docking link and the capturing cone, and the operational space control is applied to achieve the assembling operation control under the Cartesian space. Through simulating and analyzing the influence of the stiffness coefficient, the soft and hard behaviors during assembling are discovered, which would provide a basis for assembling control and parameter design. The results would have important academic value and engineering significance on space robot achieving on-orbit self-assembling.
Modal Analysis of Self-Repairing Composite Gear Based on ANSYS
Authors: Zhang Li , Bu Xiao Yuan , Gong Yan Jue
Published: February 2011

The mechanical properties of self-healing composite gear with microcapsules can be effectively improved. Based on Finite Elements Analysis method, the modal analysis of three different formulations of composites gear have been carried out in order to explore effects of self-healing microcapsule on the modal parameters of a gear. The comparison of results shows that modulus ratio is one of important inflencing factors on the natural frequency of a gear. The study in this paper provides a good foundation for further research on self-healing composite gear.
Computer Simulation of Fracture Damage for Large-Diameter Percussive Drill
Authors: Wang Xue , Yu Fu Sheng , Dong Mao Qi , Zhang Rong Lu
Published: February 2011

A large-diameter trapezium percussive drill modeling is made by finite element modeling software and a computer simulation study of the drill is carried out in this paper. By a drop test analysis, the stress changes of each trapezoid faces is showed and the the larger stressed places are found out in this paper.The larger stressed places are easy to be fracture damaged.The beneficial theory basis will be provided by this simulation for the structural optimization of large-diameter percussive drill.
Finite Element Analysis on Contact of Wheel and High Manganese Steel Crossing
Authors: Xiao Jun Hua , Zhang Fu Cheng , Qian Li He
Published: February 2011

An elastic-plastic finite element study on the contact of a railway wheel and a high manganese steel crossing is reported. The contact model of the wheel/crossing/ties is established to simulate the interactions between the wheel and crossing and between the crossing and ties. The effects of train speed and axle load on the von Mises stress and the equivalent plastic strain of the high manganese steel crossing are discussed.
The Numerical Simulation of the Water Jet in Hydroentanglement
Authors: Zhang Heng , Qian Xiao Ming , Lu Zhi Min , Bai Yuan
Published: February 2011

The functions of hydroentangled nonwovens are determined by the degree of the fiber entanglement, which depend mainly on parameters of the water jet. According to the spun lacing technology, this paper set up the numerical model based on the simplified water jetting model, establishing the governing equations, and the blended two-phase flow as the multiphase flow model. This paper simulation the water needle after the water jetting from the water needle plate in the different pressure (100bar, 60bar, 45bar, 35bar).
Discrete Jerk-Limited Feedrate Planning for NURBS Curves Interpolation
Authors: Chen Jian Xiong , Lin Shu Wen
Published: February 2011

In this paper, the jerk-limited feedrate planning is used to adaptively change feedrate with consideration of machine dynamics in the sensitive corners. The curvature is introduced to detect sensitive corner by the look-ahead module to avoid the situation that the curvature is zero. The parameters of every deceleration stages are solved with a series of formula first, and then the feedrate profile is discretized with consideration of the deceleration time, which must be an integer multiple of the interpolation sample time. In addition, the deceleration start point estimation method is described in detail, and a number of deceleration terminal speeds are added into the discrete feedrate profile to drive the machine tool to the right position.
Cellular Automata Simulation of Grain Growth under Consideration of Zener Pinning
Authors: Ma Xiao Fei
Published: February 2011

Based on cellular automata, a model of simulating grain growth is established to study the effects of the second phase particle’s size and volume fraction on grain growth. The simulation results show that the smaller is the volume fraction of second phase particle, the finer is the grain of pinned matrix, and the pinning force of bigger second phase particle is stronger than that of smaller one. The correlative laws obtained from the simulation is in accordance with the theoretical models.
The Estimation of TP Chromatic Aberration by Using Neural Network
Authors: Huang Du Jou , Liu Fang Tsung , Chuang Shang Jen , Huang Huang Chu , Hwang Rey Chue
Published: February 2011

In this paper, the chromatic aberration estimator of touch panel (TP) decoration film by using neural network is presented. Through the training of neural network, the complex relationship between the chromatic aberration and the parameters of evaporation process of TP decoration film is expected to be found. Thus, an intelligent decision mechanism for the chromatic aberration of TP film on its evaporation process could be developed. Based on this mechanism, the technician could set the control parameters of evaporation in advance so that the quality of chromatic aberration of TP could meet the customer’s request.
CAD Design and Mechanical Test on inside Porous Parts
Authors: Wu Mao Liang
Published: February 2011

The paper discusses CAD design on the pores created with simple units such as cylinder, whose structures are determined by unit space array mode and size. Pore ratio, independent to unit models, only relates to orifice diameter and scanning space in fused deposition manufacturing (FDM). Mechanical strength is measured to verify the influences of array modes and inside sizes. The tests demonstrate that 0/90°array mode has larger strength and that the cylinder bears the more pressure along the axis. Stress-strain curve reveals the 4 sections when the parts deform, including linear stage, slightly change stage, increasing stage and damage stage.