bluuebunny/crossref_metadata_2025 huggingface dataset:
Drilling Force and Chip Morphology in Drilling of PCB Supported Hole
Authors: Yang L.P. , Huang Li Xin , Wang Cheng Yong , Zheng L.J. , Ma Ping , Song Yue Xian
Published: March 2011

Supported holes of Printed circuit board (PCB) are drilled with two different drill bits. Drilling force (thrust force and torque) and chip morphology are examined at different cutting parameters, and the effects of the two drills are discussed. The results indicate that the drilling force and chip morphology are affected by the feed rate, spindle speed and drill shape. Thrust force increases with the increasing feed rate, and decreases with the increasing spindle speed. Optimization of drill geometry can reduce the thrust force significantly, and is effective in chip breaking which can improve the chip evacuation during the drilling process.
The Performance of the Hydraulic Expansion Toolholder in High-Speed Rotation
Authors: Wang Shu Lin , Zhang Wei Zhan , Zhang Qin , Liu G. , Yang Z.J.
Published: March 2011

On the basis of finite element analysis, the static transmitted torque of Hydraulic Expansion Toolholder is validated. At the same time fluid analysis software is used to investigate the oil pressure changes in oil chamber wall because of different rotation speed. Then through the fluid-solid coupling, the article analyzes the chuck clamping performance on the factors of expansion chuck and tool clearance, rotation speed, and hydraulic oil pressure when toolholder on the state of high rotation speed.
Dynamic Analysis of Helical Milling Unit Based on Virtual Machine Tool
Authors: Qin Xu Da , Wang Qi , Wang H.Y. , Hua Song
Published: March 2011

The virtual prototype is a computer simulation model of the physical product that can be analyzed like a real machine. This paper studies the helical milling unit based on the virtual machine tool. The helical milling unit is first designed according to the kinematics of the helical milling. The main parts of the equipment include rotating mechanism, orbital agency and radial offset organization. Based on the feasibility analysis of the structure, the three-dimensional geometrical model is built in the Solidworks software. The key parts in the model are separated from the device and introduced into the finite element analysis (FEA) software, according to the cutting loads tested from experiment, static and dynamic modal analysis and harmonic response analysis are carried out for the key parts of this device. The results show that the static and dynamic stiffness can meet design requirement.
Research on MFBD Modeling Method for a Gantry Machining Center Beam Components
Authors: Yang Q.J. , Li D.N. , Kong L.L. , Li K.
Published: March 2011

In modern machining processes, Gantry Machining Center is one of the most important machine tools. Moreover, beam components directly relate to the overall performance. From multi-body simulation (MBS) and finite element analysis (FEA) respectively, the paper discusses current state of the multi-body dynamics modelling of the machine tool components in domestic and overseas. In this paper, We adopt a method, the multi-flexible body dynamics(MFBD) modeling method for machine tool transmission components (linear guidance and ball screw drives) in software Recurdyn, to create the conditions for MFBD simulation analysis of the beam components system. Much more, it provides a way of MFBD modelling for machine tools components in both the high-speed and high-performance.
Study on the Thermal Contact Zone in the Surface Grinding
Authors: Hua Chong Lue , Wang Gui Cheng , Pei Hong Jie , Liu Gang
Published: March 2011

The present study aims to investigate the temperature field by using the different heat fluxes, such as rectangle heat flux, triangular heat flux, inclined triangular heat flux, circular heat flux. To obtain a reliable figure of temperature field induced by grinding, temperature-dependent properties of work materials were taken into account and a convection model with an effective cooling factor was introduced. A thorough analysis using the finite element method showed that predictions were very agreed with the results of the experiment. Finally, the present paper showed that the contact angle must be taken into account in future models.
Study on High-Speed Drilling of SUS304 Based on FEA
Authors: Yan M.P. , Shao H.
Published: March 2011

Experimental explorations for optimal cutting conditions on high speed drilling processes could be expensive and risky both to machine tools and operators. In this study, high-speed drilling of SUS304 stainless steel with a TiN-coated drill was simulated for optimized drilling conditions. Tool wear mechanism as well as chip formation processes was also explored based on finite element analysis (FEA). It was found with the simulations that higher cutting speed came up with smaller tool wear.
The Process Strategies of Mould High-Speed Machining and their Applications in the Environment of PowerMILL
Authors: Liu Jie
Published: March 2011

High-speed machining requires the support of high intelligent CAM software as well as customized machining strategies and properly selected machining parameters. Only by combining the two can the advantage of high-speed machining be made full use of. Compared to ordinary NC cutting, high-speed machining has special requirements for process strategies, CAM system and tool path. A complete tool path includes approaching/retracting tool, moving tool and tool path. Based on the above principles, a mould part is successfully processed using the PowerMILL software at the high-speed machining centre of DMG-DMU40T. The maximum hardness of the mould part is HRC50. There’s a 30 degree corner in the cavity with a transition radius of 3mm. The whole process can be divided into three stages: rough, semi-finish and finish machining and each stage involves the selection of tool path, the selection of tool, the selection of cutting parameters (including spindle speed, feed speed and depth of cut), and the application of PowerMILL specific machining methods (such as Race-line machining, rest roughing, automatic trochoidal machining, 3D offset finishing and etc).
The Numerical Simulation of the Aluminum Alloy Processing
Authors: Xiao B.J. , Wang Cheng Yong , Hu Ying Ning , Song Yue Xian
Published: March 2011

A two-dimensional orthogonal thermal-mechanical finite element model by Deform2D finite element analysis software is established in the article. By the adaptive meshing technique, not only cutting process but also the effect on the process of aluminum alloy Al6061-T6 processing as friction coefficient changing is simulated. The simulation shows that the friction coefficient has significant effect on the cutting temperature and cutting force, and the effect is nonlinear. With the increasing of the friction coefficient, the cutting temperature and cutting force will both increase. The impact the friction coefficient has on the surface residual stress is much smaller than the impact on the cutting temperature and cutting force.
The Establishment of Dynamic Model and Stability Research on High-Speed Precision Hard Turning
Authors: Chen Guang Jun , Liu Xian Li , Zhao Zhong Yang , Li Wen Dong , Xiao Fei
Published: March 2011

High-speed precision hard cutting always causes vibratory motion, which has great influence on production efficiency, machining quality, machining environment, operating cost, machine tool life and cutting tool life. The dynamic model is established that is about flutter system of external circular finish turning recycled hardened steel; the limit of hard cutting system stability is analyzed, and the limit of hard cutting system stability can be predicted with numerical simulation in Matlab; with the larger corner radius change and the more the hardness of workpieces increases, the more the maximal stabile cutting width reduces. Hardened steel GCr15 is cut in different cutting condition with PCBN tools, the result obtained by the method coincides with the actual result. So, with selecting cutting parameters through the method, it is ensured that the cutting proceeds in the stable region throughout.
Cutting Parameters Optimization of the Matching of Lengthened Shrink-Fit Holder and Cutter in High Speed Milling
Authors: Zhou Hou Ming , Wang Cheng Yong , Deng Jian Xin , Song Y.X.
Published: March 2011

Taking the machining efficiency and surface quality as the optimization objective, a multi-objective and multi-constrained optimization model of the high-speed milling parameters based on the matching of lengthened shrink-fit holder (LSFH) and cutter was established using fuzzy optimization theory. In this model, the contact performance, grip rigidity and dynamic characteristics of the matching of LSFH and cutter were taken into account. Subsequently, the optimization problem of the fuzzy domain was transformed into the optimization problem of the ordinary domain using the Optimal Level Cut Set Method. The optimization results show that the processing time reduced by 5.95% and 8.54%, the surface roughness decreased by 5.42% and 6.85% compared to conventional optimization model and the parameters recommended by the tool manual respectively. The effectiveness and practicality of this optimization method was further proved by processing examples.
Fault Diagnosis of Pump Based on a Hybrid HMM/SVM Model
Authors: Yue Xia , Zhang Chun Liang , Li Jian , Zhu H.Y.
Published: March 2011

A hybrid support vector machine (SVM) and hidden Markov model (HMM) model was introduced into the fault diagnosis of pump. This model had double layers: the first layer used HMM to classify preliminarily in order to get the coverage of possible faults; the second layer utilized this information to activate the corresponding SVMs for improving the recognition accuracy. The structure of this hybrid model was clear and feasible. Especially the model had the potential of large-scale multiclass application in fault diagnosis because of its good scalability. The recognition experiments of 26 statuses on the ZLH600-2 pump showed that the recognition capability of this model was sound in multiclass problems. The recognition rate of one bearing eccentricity increased from SVM’s 84.42% to 89.61% while the average recognition rate of hybrid model reached 95.05%. Although some goals while model constructed did not be fully realized, this model was still very good in practical applications.
The Application of Fuzzy Comprehensive Evaluation to Cutting Sequences' Optimization of Multi-Feature Part
Authors: Li Zhe , Zheng Min Li , He Jia , Ming Jun Jian
Published: March 2011

The fuzzy comprehensive evaluation which is one of the important embranchment of fuzzy mathematics is often used in the field of science management and decision, but less used in the machining process. Based on the fuzzy mathematical theory, we put forward the establishing process of fuzzy comprehensive evaluation model, and then set up the three-grade fuzzy comprehensive evaluation model of cutting sequence. Three cutting sequences of multi-feature bearing chock component have been evaluated, the evaluation results have verified the rationality and trueness of the model. The application and dissemination of the fuzzy comprehensive evaluation will have active significance in the machining process.
UG-Based Parametric Design of Copy Milling Cutters
Authors: Ma Dian Lin , Wang Yu , Ji Sheng Yuan , Ding Yun Peng , Li W.T.
Published: March 2011

UG Open/Grip and Open/API hybrid programming approach allows accurate modeling of copy milling cutters, avoiding modeling in the software caused by inefficient and poor accuracy flaws. This paper uses all parameters design of UG-based hybrid programming, forming a series of three-dimensional entity of copy milling cutters rapidly by modifying the basic parameters of the copy milling cutters, which can greatly improve the design efficiency of a series copy milling cutters.
Curve Construction for Virtual Hand Modeling and Manipulation
Authors: Chen P. , Yao Y.X. , Zhou L. , Xia P.J.
Published: March 2011

In this paper, a curve description of human hand anterior surface is proposed. In a hybrid motion capture framework, template matching and Camshift algorithms are applied to track the colored markers and “V” shape labels attached on Cyberglove. 3D positions of nodes are computed from left and right images and regarded as the points passing through B-Spline curve. Control points of the curve are computed and the simulated curve in 3D space is demonstrated. The constructed curve can be used for virtual hand modeling and manipulation.
Study on CAD/CAM Software System of Machining Spatial Curved Surface by WEDM
Authors: Yan Bing Bing , Chen G.J. , Shuai J.F. , Huang D.C.
Published: March 2011

The design, modeling and simulation are one of the key technologies of CAD/CAM software system. The mathematical model of the CAD/CAM system for machining spatial surface was given firstly. After the design idea of the CAD/CAM system was describe in detail, the workflow of the CAD/CAM software system was illustrated, and then data exchange mechanism was determined and detailed steps were given simultaneously. Under MFC framework, the CAD/CAM software system was finished using OpenGL, and the configuration and machining process simulation were carried out. All these works provide an effective approach to raising the productivity and precision of machining spatial curve surface part by WEDM-HS.
Numerical Investigation on Particle Velocity in Cold Spraying of Hydroxyapatite Coating
Authors: Zhang Lei , Zhang Wen Tao
Published: March 2011

Hydroxyapatite (HA) is a calcium phosphate ceramics and HA coating is essential for the medical metallic implants. This paper presents a novel cold spraying method for the formation of HA coatings instead of the commonly used thermal spraying method. The HA particle velocity in the cold spraying process is investigated numerically using a computational fluid dynamics (CFD) program, FLUENT. Stress is laid on how the geometric parameters of the nozzle and the process parameters influence the particle velocity. A Taguchi’s orthogonal array is employed to arrange the simulation conditions and the simulation results are analyzed by analysis of variance (ANOVA) method to reveal the main factors influencing HA particle acceleration significantly. The changes of the HA particle velocity under different cold spraying conditions are simulated to clarify the effects of the nozzle geometry, accelerating gas condition and property of particle itself on HA particle acceleration.
Incidence Analysis on Characteristic of High Speed Ball-End Milling Hardened Steel
Authors: Jiang Bin , Yang Yin Jin , Liu Xian Li , Qi Chang Xing , Zhao Xing Fa
Published: March 2011

In high speed ball-end milling hardened steel, the increase of hardened steel hardness and cutting efficiency make cutting loads changing, and fuzzy and uncertain properties exist in evaluating cutting vibration and machining surface quality. To explore the means for high efficiency and precision machining hardened steel, carried out the experiment of high speed ball-end milling hardened steel, and acquired behavior data of high speed milling characteristic and influencing factors. Founded the model of high speed ball-end milling behavior characteristic using grey system theory, acquired the behavior sequence of high speed ball-end milling hardened steel. Accomplished incidence analysis of high speed milling characteristic, and proposed the solution to high efficiency and precision machining hardened steel. Results indicate that the increase in cutting efficiency makes workpiece vibration and the increase in surface roughness. The influence of the row spacing on the vibration in feed direction is more remarkable than the vibration in row spacing direction. Grey incidence matrix of high speed ball-end milling characteristic reveals the interaction level of characteristic and influencing factors. Increase in rotational speed and row spacing, and decrease in feed per tooth and inclination angle of cutter can restrain availably the vibration in high speed ball-end milling hardened steel, and obtain higher cutting efficiency and surface quality.
The Development of Micro Abrasive Waterjet Machining Technology
Authors: Luo Wu Sheng , Wang Cheng Yong , Wang Jun , Song Y.X.
Published: March 2011

Erosion caused by solid particle impact is a very common phenomenon. In many fields such as particle (or slurry) transportation, equipment protection in a dust environment, turbine engineering, etc., prevention of particle erosion is the task. In other applications, it is used as a tool for desirable material removal, surface cleaning, controlled destruction, numerous studies on this subject have been conducted by researchers from many disciplines including physics, material science, mechanics, manufacturing, standardization, etc.. To provide a comprehensive view of the problem of erosion by solid particle impact, a review is conducted based on the literature collected on material subject of erosion by solid particle impact. The reviewed works are limited to ductile material erosion and four categories: erosion mechanism, parametric studies, material removal modeling and simulation modeling.
An Experimental Study on Rough Ball-End Milling of T10A Steel
Authors: Zhuang Xin Qiang , Huang Chuan Zhen , Liu Zi Ye , Zou Bin , Liu H.L. , Zhu H.T.
Published: March 2011

The milling experiments of the annealed T10A steel were carried out in the various cutting conditions using the coated cemented carbide tool. The cutting parameters were designed by the multi-factor orthogonal experiment method, and the effects of cutting speed, feed, axial depth of cut and radial depth of cut on the cutting force and tool wear were investigated. The tool wear mechanisms were also discussed. Adhesion, abrasion, diffusion and oxidation were the main tool wear mechanisms. According to these investigations, the optimizing cutting parameter was recommended.
An Experimental Study on Grinding of SiC/Al Composites
Authors: Xu Li Fu , Zhou Li , Yu Xiao Lin , Huang Shu Tao
Published: March 2011

In this paper, grinding experiments on the machining of SiCp/Al composites using SiC grinding wheel have been carried out. The effect of the grinding parameters on the grinding forces, surface morphology and surface roughness were evaluated. The results indicate that the grinding depth has more significant effect on the grinding force than that of feed speed, and there are many fracture or crushed SiC particles on the ground surface. Therefore, the SiC wheels can be used for rough grinding of SiCp/Al composites.
Experimental Study on the Dynamic Characteristics of High Speed Milling on Inclined Planes
Authors: Zhang Q.L. , Wang Cheng Yong , Hu Ying Ning , Song Yue Xian
Published: March 2011

High speed milling (HSM) on inclined plane is the basic process of die and mould. The dynamic characteristics of the process are experimentally studied by changing the factors as inclined plane, cutting parameter and feeding mode on the high speed milling machine tool. The angles of inclined plane, spindle speed, feed amount and cutting depth are evaluated by the parameters of cutting forces and vibration. The feeding of projection process limits the milling vibrations mainly from horizontal (X) and (Y) directions. The cutting force reaches the peak value when the angle of inclined plane is 45°. The radial cutting depth shows more effects than the axial cutting depth to cutting force and vibration. However, the axial cutting depth should keep a minimum value when using ball mill.
The Effect of Interface Damage on Macroscopic Constitutive Behavior of Composite Materials
Authors: Ma Chang Bing , Qiang Hong Fu
Published: March 2011

Base on the finite element method, the effect of interface damage on macroscopic constitutive behavior of composite materials subjected to uniaxial tension was studied. A bilinear cohesive law, which relates the traction and displacement jumps, was adopted to model the debonding of particle/matrix interface. Stress-strain curves for a material with different interface properties, particle size and volume fraction were discussed in detail. The results show that the damage due to debonding of particle/matrix interfaces can significantly affect the macroscopic response of composite materials, and that the interaction of particles is innegligible in multi-particle structure.
The Extraction Processes and Biological Characteristics of a New Generation Demineralized Bone Matrixes
Authors: Zhou Zhi Yu , Zou Li Jin , Li Hai Sheng , Bunger Cody , Zou Xue Nong
Published: March 2011

An ideal bone graft material should have osteocondutive, osteroindurctive, and osteogenic features. Scientists and doctors have been trying to develop this kind of material for over one century. However, all the features of few materials used in clinic now have been qualified. Recently, COLLOSS, as the new generation bone graft material of demineralized bone matrix, almost achieved this height. The paper presents a general survey of COLLOSS including its extraction processes, biological characteristics, and application prospects.
Efficiency Measurement of Bionic Propulsion
Authors: Liu Yun , Jiang Wei , Jing Zhi Sheng , Su Xiang Yong , Lu Ming
Published: March 2011

The existences of traditional water propulsion promote low efficiency. Used by biological propulsion, after the last million years of evolution, the maximum utilization of its power, the best way. Bionic propulsion system designed in this paper consists of two large travel umbrella wing plate in reciprocating linear travel agencies, led by the reciprocating motion along the vertical, in the water under the influence of backward movement of the wing disk automatically open, resulting in the pull forward, the forward movement of the wing disk automatically shut down to reduce water resistance. This paper designs a bionic propulsion and efficiency measurement tests carried out.
Forward Displacement Analysis of a Parallel Manipulator
Authors: Huang Xi Guang
Published: March 2011

A new algebraic method for the solution of the forward displacement analysis of a parallel manipulator is presented in this paper. Based on the algebraic method, the problem of the forward displacement problem is reduced to a polynomial equation in a single unknown from a constructed matrix which is relative small in the size. From the univariate equation, all closed-form solutions of the different locations of the mechanism can be derived.
The Structure, Morphology and Catalytic Performance of a Silica Supported Cu Catalyst for Ethylene Glycol Synthesis
Authors: Zhu Ling Jun , Wang Shu Rong , Ge Xiao Lan , Li Xin Bao , Luo Zhong Yang
Published: March 2011

A silica supported Cu catalyst with good performance for ethylene glycol (EG) production was prepared by the hydrolysis of tetramethoxysilane (TMOS) in one phase solution using methanol as co-solvent, followed by the precipitation of copper on SiO2 by ammonia evaporation. XRD, SEM and TEM were carried out to characterize the structural and morphology properties of the catalyst. The results showed that Cu particles were homogeneously dispersed on the support and thus lead to the high catalytic performance.
Research on the Microstructure of Solid FeS by TEM
Authors: Zhu Li Na , Wang Cheng Biao , Wang Hai Dou , Xu Bin Shi , Liu Jia Jun , Li Guo Lu
Published: March 2011

The microstructures of three kinds of synthetical solid FeS, acting as a solid lubricant, which includes FeS bulk, FeS particle and FeS powder, were studied by transmission electron microscope (TEM) in this article. The TEM photographs showed that different shapes of FeS had quite dissimilar characteristics. The texture of FeS powder was the loosest among the three shapes, and it tended to forming flocculent aggregation; while FeS bulk and FeS particle were more dispersive. The electron diffraction results showed that the crystals of solid FeS were composed of many single crystals and multi-crystals, with two kinds of crystalline structure- hexagonal structure and face-centered cubic structure.
Structure and Tribological Behaviors of Synthetic MoS2 Film Prepared by a Novel Compound Method
Authors: Zhu Li Na , Wang Cheng Biao , Wang Hai Dou , Xu Bin Shi , Liu Jia Jun , Li Guo Lu
Published: March 2011

In this paper, the structure and tribological properties of synthetic MoS2 film prepared by a novel compound technology—combining magnetron sputtering with low temperature ion sulfurizing were investigated. X-ray diffraction (XRD) pattern for the MoS2 film implies that the film mainly consists of Mo and MoS2 phases. The hardness of the synthetic MoS2 film was 7.44 GPa which was higher than that of the FeS film. The sliding tribological behavior of the MoS2 film was studied by ball-on-disc tests. The results showed that the synthetic MoS2 film possessed excellent friction-reducing and wear-resisting properties. In addition, the tribological behaviors of the MoS2 film were superior to those of the FeS film and original 1045 steel.
Research on the Tribological Property of Synthetic Multilayer MoS2/FeS Film under Dry Condition
Authors: Kang Jia Jie , Wang Cheng Biao , Wang Hai Dou , Xu Bin Shi , Liu Jia Jun , Li Guo Lu
Published: March 2011

In this paper, we adopted a novel method, namely, magnetron sputtering + low temperature ion sulfurizing composite technology to prepare synthetic MoS2/FeS multilayer film. The obtained film has a quite smooth surface with plenty of spherical particles. The friction tests were carried out on a ball-on-disc tester under dry condition. During the whole test, the friction coefficient of the MoS2/FeS multilayer film was always lower than that of the original 1045 steel and FeS film. In addition, the wear scar depth of the MoS2/FeS multilayer film was also low. It is undoubtedly that the synthetic MoS2/FeS multilayer film possesses excellent friction-reducing and wear-resisting behaviors.
Experimental Study on Mechanical Properties of High-Strength Concrete Using Blast Furnace Slag Fine Aggregate
Authors: Shi Dong Sheng , Masuda Yoshihiro , Lee Young Ran
Published: March 2011

In this experiment, blast furnace slag fine aggregate that was produced by 3 different steel factory was been used in high-strength concrete, and mechanical properties of high-strength concrete were studied. The concrete using the blast furnace slag fine aggregate is admitted the increase of compressive strength as well as the case of the river sand when the water cement ratio is reduced, and the compressive strength can attain 100N/mm2. The strength of concrete using blast furnace slag fine aggregate is lower than the strength of concrete using natural river sand as fine aggregate, and the strength of concrete using mixture fine aggregate is middle of strength used river sand and strength used blast furnace slag fine aggregate. The crushing value of blast furnace slag fine aggregate is bigger than the natural river sand, and it could influence the strength of high-strength concrete using blast furnace slag fine aggregate.
Synthesis of a Low-Density Copper Oxide Monolithic Aerogel Using Inorganic Salt Precursor
Authors: Bi Yu Tie , Ren Hong Bo , Zhang Lin
Published: March 2011

Copper oxide monolithic aerogel was prepared by sol–gel method using inorganic salt as precursor, ethanol as the solvent, and propylene oxide as the gelation agent. Calcination of the as-prepared aerogels at different temperatures induced a phase change which resulted in the formation of a mesoporous copper oxide aerogels. Field emission scanning electron microscopy (FESEM), Highresolution transmission electron microscopy (HRTEM), and Brunauer-Emmett-Teller(BET) methods were used to characterize the as-prepared aerogels. The combined results indicated that the as-prepared CuO aerogel has high porosity, high surface area, and low density. The X-ray diffraction (XRD) patterns show that the as-prepared CuO aerogel is highly crystalline and is identified to be predominantly copper chloride hydroxide, Cu2Cl(OH)3。
Analysis on Steady Temperature of Honeycomb-Core Panel Based on Coupled Aerothermal Heating and Honeycomb Conduction
Authors: Liang Wei , Fu Yu , Liu Zhen Qi , Yang Lu Lu , Mai Han Chao
Published: March 2011

A physical model is formulated to evaluate the steady temperature field of honeycomb-core panel. The model takes into account the coupled effect of aerothermal heating and radiate energy from front and rear plate and honeycomb thermal conduction. The equations that are established based on the model are solved in numerical method and the equivalent thermal conductivity is obtained. The model is also used to investigate the effect of coming fluid and the geometric parameters of honeycomb structure on the TPS capacity.
Characterization and Possibility of Coconut Filter Fibers as Reinforcement for Polymers
Authors: Suardana N.P.G. , Abdalla Ali , Yoon Ho Cheol , Cui Jian Guo , Jung Do Yeon , Lim Jao Kyoo
Published: March 2011

Untreated and treated with alkali (NaOH), acrylic acid (AA), diammonium phosphate (DAP), and maleic anhydride (MA) of coconut filter (CF) fibers were characterized using scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), thermogravimetric analysis (TGA), and single fiber test. The composites were fabricated from CF and film resins (Polylactic-acid (PLA) and Polypropylene (PP)) using a hot press machine. Generally, our results indicated that chemical treatments improved the mechanical properties of CF fiber composites, except for the DAP-treated fiber/PP composite. The AA treatment of fiber produced the best adhesion at the fiber-matrix interface. Consequently, the tensile and flexural strengths of AA-treated fiber-reinforced polymer were the highest. CF fiber-reinforced PLA composites had better mechanical properties than CF fiber-reinforced PP composites. Our results show that CF fiber is feasible as a reinforcement for polymer composites.
Study on the Compression Properties of Epoxy Matrix Composites Reinforced by PES Warp-Knitted Spacer Fabric
Authors: Huo Fu Lei , Zhang Guo Li , Li Jia Lu , Chen Guang Wei , Chen Li
Published: March 2011

This research paper presents an experimental investigation on the compression and compressive resilience properties of warp-knitted spacer fabric composites with different resin content and different kinds of resin. By means of hand roller coating technology, four kinds of warp-knitted spacer fabric composites were made. The experiments were tested according to GB/T1453-2005 and ISO3386/2:1984. It is shown that the resin content and resin type seriously affect the compression and compressive resilience properties of warp-knitted spacer fabric composite. The data indicated that when the warp-knitted spacer fabric composite coated with the same kind of resin, with increasing resin content the elastic modulus added and the compressive resilience decreased. Having the same resin content, the compression properties of pacer fabric composite increase with the increase of flexural strength of resin; while the compressive resilience decrease.
OWL-Based Description for Agent
Authors: Wang Gang , Lin Jie , Long Qing Qi , Hu Zhi Juan
Published: March 2011

This paper presents a detailed formal specification of agents and their properties and abilities,based on the Web Ontology Language (OWL). It allows an agent to be specified entirely using standard mark-up languages from the Semantic Web community, namely RDF, RDF Schemaand OWL. The basic agent components are identified and their implementation using ontology development tools is described.The description improves consistency, interoperability and maintainability of agent program. Therefore,the design errors in the early development stages could be efficiently detected and avoided.
Preparation of Refractory Castable for High-Temperature Zone of the Alumina Kiln
Authors: Cao Xin Xin , Liao Jian Guo , He Xiao Fang , Zhu Ling Li , Wang Rui Na , Ma Qian
Published: March 2011

The cChromic shaped bricks have been used as the refractory lining in alumina kiln for long time, whose service life is about 120~250 days. Besides the short working time, the environmental pollution led to by the chromic component is also serious. In this thesispaper (thesis 是硕士论文), some materials are were chosen based on the actual situation of the usage of the refractory lining in the current alumina kiln. The choosing principals are were the extensive source and the relatively low price. Finally, a new formula of the refractory castable is was acquired based on the orthogonal test and has passed the properties testing.
Preparation of Bio-Degradable Polyurethane Foams from Liquefied Wheat Straw
Authors: Chen Qiu Ling , Li Ru Yan , Sun Ke Wei , Li Jian Chang , Liu Chang Hua
Published: March 2011

Bio-degradable polyurethane foams were prepared from the liquefied wheat straw alcohol by a reaction with isocyanate in the presence of stannous octoate, triethylene diamine and silicone oil. The influences of the catalyst, water, silicone oil, isocyanate index(IN) on the performance of the properties of the foams obtained were investigated. Furthermore, the chemical structures, thermal performance and degradation performance of the products were analyzed.
Effect of Interface Improving on Morphology and Properties of Coir Fiber/LLDPE Bio-Composites
Authors: Tan Hong Sheng , Yu Yuan Zhang , Zhang Jing
Published: March 2011

The mechanical properties of coir fiber/line low density polyethylene (LLDPE) bio-composites were studied and micrographs of fracture surface of impact specimens for the composites were analyzed by scanning electron microscope (SEM). The flexural and impact strength of the composite with a compatilizer were higher than that of the composite without a compatilizer. The results of interface morphology of the composites with a compatilizer show better interfacial adhesion than that of the composites without one by SEM. That compatibility between the fiber and LLDPE resin is improved on, which is essential reason of rigidity and toughness increase of the composites.
Effect of Finishing on the Structure and Filtration Property of PPS Filter
Authors: Yu Bin , Han Jian , Zhang Qi , He Xiang Bing , Xu Guo Ping
Published: March 2011

The PPS needle nonwoven filter were treated by singeing, calendaring, dipping and covering with PTFE membrane. Their structure and property were studied. The results showed that the thickness of filter was decreased and their weight was increased by finishing. Their surface structure became denser after being treated. The pore diameter and filtration resistance of the filter were increased by finishing. The filtration efficiency of the filter was largely improved by finishing, especially covering with the PTFE membrane.
Developed Machine Learning Technology and its Application on Electric Power System
Authors: Zheng Hua , Xie Li , Zhang Li Zi
Published: March 2011

There is a general consensus that the movement of electricity price is crucial for electricity market. As a practical tool to estimate the future prices, electricity price forecast is of great importance and use for the operations of market participants. So a hybrid forecast model is proposed in this paper that integrates independent component analysis (ICA) with least squares support vector machines (LS-SVM). First, a novel feature extraction method of price influence factors is proposed based on ICA, which aims at mining the latent source-features by using the higher-ordered statistical characteristics. After that, nonlinear regression modeling of electricity price and its extracted features is accomplished by LS-SVM with more efficient training and forecasting. Finally, Californian market data are employed to test the proposed approach.
Intelligent Simulation Method and its Application on Risk Analysis
Authors: Zheng Hua , Xie Li , Zhang Li Zi
Published: March 2011

This article describes an intelligent simulation method for measuring price risk, which is still one of the important problems for various risk managements and need to be studied profoundly. To solve this problem, risk measured in terms of Value at Risk on electricity price is proposed by intelligent simulation. In this work, prices under various market scenarios are produced by intelligent model using fuzzy neural network (FNN). After that, the quantitative model for price risk analysis is built in the form of a function of the estimated probability distribution of price, where price VAR is determined from the distribution according to parameter set, i.e. confidence level. The proposed method is more realistic and effective than variance approach to provide the assessment of the potential loss of electricity price over some period of time.
The Higher Order Asymptotic Fields for Plane Interfacial Crack with Physical Weak-Discontinuity
Authors: Dai Yao , Zhang Lei , Zhang Peng , Liu Jun Feng
Published: March 2011

The higher order discontinuous asymptotic fields which are similar to the Williams’ solutions of homogenous material are obtained by the displacement method and asymptotic analysis for a plane crack at the physical weak-discontinuous interface in non-homogeneous materials. The results provide a theoretical basis for the numerical analysis, experimental investigation and the engineering application of physical weak-discontinuous fracture.
Research on Automatic Monitoring System with Measurement Robot
Authors: Mi Yan Hua , Liu Li Xin , Lai Li Fang
Published: March 2011

This paper introduced the characteristics of functions of the automatic monitoring system on surveys robot (TCA total station ). Has analyzed the application situation and the precision of the automatic monitoring system. Practical applications indicated that this system had high efficiency and precise data transmission. The achievement of surveys achieved very high precision in both horizon talplane and vertical direction. The results can provide technology references for similarprojects.
Analysis of Powder Segregation in Powder Injection Molding
Authors: Wang Yu Hui , Qu Xuan Hui , Zhang Wang Feng , Li Yan
Published: March 2011

The powder injection molding (PIM) combines the thermoplastic and powder metallurgy technologies to manufacture intricate parts to nearly shape. The powder segregation is a special effect arising in PIM different from than the pure polymer injection. The two-fluid flow model is used to describe the flows of binder and powder so as to realize the prediction of powder segregation effect in PIM injection. To take into account binder–powder interaction, the mixture model of inter-phase exchange term is introduced in the two-fluid model. The two-fluid equations largely resemble those for single-fluid flow but are represented in terms of the mixture density and velocity. The volume fraction for each dispersed phase is solved from a phase continuity equation. As the key to calculate the phase exchange term, the drag coefficient is defined as a function of mixture viscosity. The effective viscosity of binder and powder are agreed with the additive principle. The volume fractions of binder and powder give directly the evolution of segregation during the injection course. Segregation during PIM injection was simulated by software CFX and results were compared with experimental data with good agreement. The basic reasons that caused segregation are identified as boundary effect, differences in density and viscosity of binder and powder. The segregation zones are well predicted. This showed that the two-fluid model is valid and efficient for the prediction of the segregation effects in PIM injection.
Experiment on the Bending Performance of Sea Sand Concrete Beam under the Artificial Climate Environment
Authors: Lv Heng Lin , Song Ya Lin , Li Yan
Published: March 2011

Through the experiment on the durability of sea sand concrete beam which is subject to climate conditions and indoor environment, the change of deflection, beam load-deflection curve, ductility and crack are studied. The results show: concrete beams that are mixed with sea sand are deteriorated by the chloride ion and their load-deflection curves as well as stiffness and ductility are reduced in different degree. But other beams that are mixed with desalinated sea sand are reduced not obviously. Otherwise, because of the bad environment accelerating degradation of the component mechanical performance and the sea sand desalination technology increasing the ability to resist environmental erosion, the component mechanical performance and the sea sand desalination technology take great influence to the component mechanical performance.
Experiment on Bending Performance of Double Mixing HPC Concrete Beam under the Artificial Climate Environment
Authors: Lv Heng Lin , Qian Ji , Yi Yong Sheng , Li Yan , Zhu Xiao Wen
Published: March 2011

Through the experiment on HPC beam which is subject to artificial climate conditions and indoor natural environment, section strain, beam load-deflection curve, failure and cracks are studied. The results show: compared with ordinary concrete beam, the HPC beam which has been subject to artificial climate conditions has higher stiffness; the deflection amount and the width of crack of this concrete beam all fall in the confines of ultimate service state under use load; and the beam displays a better ductility in failure
A Knowledge Simplification of a Uncertain System Based on Information Consistency
Authors: Zeng Huang Lin , Zeng Xiao Hui , Zhou Ling
Published: March 2011

Based on knowledge equivalent classification of an uncertain system, from view of the knowledge coordinating relations and dependence of condition attributes and the decision attributes in an information universe，a new concept of information consistency of a database is presented to simplify knowledge of an uncertain system. A basic algorithm and realization of knowledge simplification on the information consistency of a database is suggested in this paper. It is more legible and convenient for knowledge simplification by way of the information consistency of a database than the idea of knowledge dependence. The feasibility of the proposed approaches of knowledge simplification and reasoning decision rules is validated by some of example of a classic CTR car knowledge representation system with a large-scale database here.
Mechanical Modal and Numerical Simulation of Fracture Process of Block Wall
Authors: Li Yan , Yin Xin Sheng , Wang Bo
Published: March 2011

Aerated concrete is a typical non-uniform quasi-brittle materials, the fracture process is very complicated. To slove the problem of cracks in this block walls, a practical analytical method was proposed based on the vertical mortar joint model to solve the equivalent fracture toughness (the critical value which the crack occurred to spread unstable) With the use of the basic principle of composite material mechanics and linear elastic fracture mechanics. Against the results of the related experiments, the standard deviation and the coefficient of variation of Analytical Solution are smaller, , and the equivalent fracture toughness is the effective fracture parameters of independent of specimen size. So the suggested method is more feasible and applicable, which can forecast autoclaved aerated concrete block wall’s cracking and destroying.
Hardness Prediction of 7003 Aluminum Alloy by Gradient Descent Algorithm in BP Artificial Neural Networks
Authors: Ren J.P. , Song R.G.
Published: March 2011

In order to shorten the fussy experimental process in heat treatment of 7003 aluminum alloy, back-propagation (BP) artificial neural network control of scheme has been proposed. The network of arithmetic has been deduced by using gradient descent algorithms. A BP neural network has been established between the heat treatment technique and the hardness. The results indicated that the predicted results are closed to the test results. The weakness that the nonlinear and time variation relationship between heat treatment and the hardness could be approached more accurately, effectively by using single-factor-experiment method has been overcome. Hence providing a effective, economical，rapid way for the heat treatment optimization of nonferrous metals and ferrous metal.
Study on Tear Propagation of a Fabric Laminate in Biaxial Stress
Authors: Liu Dong Xu , Jia Zhao , Hu Jie , Guo Peng Fei , Ma Yun Peng
Published: March 2011

Tear propagation is the typical fracture mode of fabric laminates, which is affected by stress and damage size. With the use of high strength fabrics, high performance laminates emerge continually. In this paper, tear propagation of a high strength fabric laminate coating polyurethane used in high altitude lighter-than-air vehicle (LTA) is studied. Cross-shaped specimens, central size 5cm×5cm, are scissored out to test tear propagation strength in biaxial stress by a tailor-made testing machine. The damnification is a cut slit in weft direction, warp fibers cut off. The cut slit is in the middle of specimens, including 0cm (scatheless specimens), 1cm, 2cm and 3cm in length. Tear propagation is observed and the strength is noted simultaneously to gain the mechanical properties of the fabric laminate. The tensile strength of the laminate is 424N/cm, and it descends to 263N/cm in cut slit length of 1cm. Subsequently, two methods based on stress field and linear elasticity fracture mechanics are introduced to analyze the tear strength, which is validated well by test results, and the coefficients of empirical formulae are obtained. It is useful to analyze the limit length and the limit stress for the fabric laminate with initial damage.
Analysis on Thermal Fatigue Fracture on Engine Exhaust Manifold Based on ANSYS
Authors: Lu Chao
Published: March 2011

The thermal fatigue fracture of engine exhaust manifold will affect its service life and engine work, to prevent and resolve this problem, finite element analysis software ANSYS was used to establish a finite element model for exhaust manifold work environment, and calculate the steady-state temperature distribution under the thermal field. Through the thermal stress analysis of manifold, identified the region most prone to the generate thermal stress and fracture, conducted failure analysis, for the existing problems analyzed the reason of thermal fatigue fracture on exhaust manifold, and provided a reliable basis for the optimization of the exhaust manifold. The thermal fatigue failure of exhaust manifold got good improvement after the structure improvement.
Wireless Granary Temperature and Humidity Monitoring System
Authors: Lu Chao
Published: March 2011

The design of a wireless temperature, humidity collecting device, the device through the integration of temperature and humidity sensors SHT11 granary and other places on the temperature and humidity for the collection, and then the data will be collected in accordance with a certain degree of agreement sent through the wireless module, the receiving party to receive unpack the data to calculate the temperature, humidity and the value displayed on the LCD screen. AT89C2051 launch system for the core parts, including temperature, humidity collection, and wireless transmitters. AT89S52 for receiving a portion of the core of the wireless receiver, combined with liquid crystal display, through appropriate software and hardware to deal with anti-jamming design of practical, small-scale collection of wireless temperature and humidity system.
How to Protect Brand Equity in Product Harm Crisis by Appropriate Response?
Authors: Fang Zheng , Ji Peng Fei , Li Xue Jun , Yang Yang , Cai Jing
Published: March 2011

Brand equity is an import but fragile asset, which is easy to suffer loss in product harm crises. However, by analyzing cases in China, we found that companies responded to product harm crises differently, implying that they didn’t reach consensus on which response was the best to protect brand equity. This paper concludes that: 1) to resolve defensible product harm crises, defensive strategy is best; 2)to resolve indefensible product harm crises, accommodative strategy is the best; and 3)company reputation plays a positive moderating role when company chooses most appropriate strategy or mixed strategy. These findings could not only help companies to resolve product harm crises effectively, but also provide suggestions for government to improve their quality safety work.