bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on Composite Slab Structure
Authors: Ding Ke Wei , Zhang Yi
Published: November 2012

About the concrete laminated slab of the research and the engineering application are summarized and prospected, including the classification, advantages and disadvantages of the laminated slab, the application and development of the laminated slab of recent advances at home and abroad, Summed-up the new prestressed laminated concrete slab structure form and application of large-span, which is the important development direction of the concrete laminated slab in future.
Study on In Situ Shearing Strength Test for the Retaining Wall Bottom in a Bank Revetment Project
Authors: Zhang Guang , Ma Jun Rong , Chen Jing Xi , Zhou Hua Lin , Wang Dong Hua
Published: November 2012

To obtain the necessary shear strength parameters of the retaining wall bottom in a bank revetment project, in-situ shearing strength test must be conducted. There are 3 kinds of foundations. One is undisturbed soil foundation, and the other two are composite foundations. Due to the limited of the engineering conditions, each kind of foundation has prepared one specimen only. So the single shearing strength test can't separate cohesion c and friction angle φ. To solve this problem, a method which is a combination of shear strength test and sliding strength test is used. Sliding strength test is carried on specimens that have already failed after shearing strength test. This test is carried in wet conditions and cohesion values and friction angle values are obtained. In addition, the influence of the processing of composite foundation to equivalent friction coefficient is analyzed. Test result can be referenced by bank revetment projects which have similar geological conditions.
Study of Light Pollution about Night Landscape Lighting
Authors: Yang Xiao Qian
Published: November 2012

Night landscape lighting is the extension of urban space and time and it reflects the prosperous development of economic and that cultural life has become increasingly rich and colorful. However, nowadays, the phenomena of pursuing excessive brightness and decorative lighting instead of functional lighting and abusing light color and following the model blindly have become prominent problems in the construction of night landscape in our country. Light pollution problem has already become the heated focus of academic theory and lighting technology management group. This thesis is based on the light pollution of cities' night landscape lighting , analyzing the harm to biosphere, social life and urban environment caused by light pollution, expounding its sphere of influence and the main forms and summarizing the problems and reasons of light pollution about cities' night landscape lighting .The aesthetic sense about city night view needs to accord with intensity of illumination standard but also to follow the principles of humanism, environmental psychology, city aesthetics, ecology and so on.
Scheduling Optimization for Parking and Taking Car about the Vertical Circulation Type Stereo Garage
Authors: Li Shu , Li Hong Ru , Zhang Xiao Bo , Ji Meng Fan
Published: November 2012

The vertical circulation type stereo garage has some advantages such as its simple construction, low cost, easy combination and less ground occupation. Regarding the problem of parking and taking car in the vertical circulation type stereo garage, the paper studies the queue system in the garage through a queue theory, the management strategy of scheduling optimization for parking and driving is obtained. The simulation experiment proved that, the whole vertical circulation garage by the optimization method stated in this paper has some advantages such as average short time for parking and taking car one time, high efficiency for average service rate.
Study Based on TMS320F2812 Synchronous Generator Field Regulator
Authors: Zhang Zhi Tian , Shi Xiao Ping , Shi Xiao Ling
Published: November 2012

This paper introduces the research on the Excitation Regulator of the Synchronous Generator with dual CPUs, based on Digital Signal Processor (TMS320LF2812). With the multiple functions of monitoring, analysis, controlling and protection, it overcomes the shortage of the domestic excitation device in terms of self-monitoring and self-protection，which effectively improves device reliability. By analyzing the allocation of reactive load of the interconnected Synchronous Motor group, the modeling and simulation of the digital excitation regulator in the power system are illustrated in the paper. The results of the simulation show that the proposed regulation model are feasible, satisfying various running demands of the Synchronous Motor and Power System.
Research of Decision Support Technologies in Multi-Dimensional Data Environment
Authors: Qiu Ze Guo
Published: November 2012

In this paper, further research has been done on the relevant decision support technology in the multi-dimensional data environment, including decision support system, the environment of multi-dimensional data model, multi-dimensional data combination problems based on data warehouse optimization problems and overall structure, etc.
Algorithm Based on Layering Search to Routes Planning of Vehicle Navigation System
Authors: He Xiong , Gao Yi Yang , Chen Tao
Published: November 2012

This Paper Introduces a Method of Designing and Organizing Road Network Data and Clarifies Algorithm Based on Layering Search, Suitable for Computing the Routes of Vehicle Navigation in Big Districts. the Algorithm Is Calculated in the High Grade Road Network, and then in the Local Refinement. the Method Is to Get a Point in the Calculated High Grade Route and then Calculate the Optimal Route from the Start Point to the Point (the Selected Point Should Be a Node near to the End), so Does the End Point. the Algorithm Was Applied to the Routes Planning and the Experimental Results Show that the Use of Data Structure and Algorithm Saves Storage Space and Greatly Improves the Calculation Efficiency.
Study of Remote Sensing and Remote Sensing Robot Technology
Authors: Guo Fu Qin , Wang Yuan Qing
Published: November 2012

Remote sensing robot technology is an emerging research area, which attains a development in recent years. In this paper, the definitions of remote sensing and robot remote sensing will be discussed, and then the remote mines detection technology of RAT-1 eight-wheeled robot, the application of IR-optical sensor in mobile robot for detection and source location of gas leakage, the monitoring of environment intelligent robot on environment and the positioning of mobile robot on targets and other focuses are emphatically introduced, and finally the important problems in each application as well as possible development of remote sensing robot technology are proposed.
Coupled-Field Finite Element Analysis of MEMS Compound Electrostatic Actuator by Using the ANSYS Software
Authors: Chen Yin Jun , Chen Qing Hua , Li Yan Mei , Wu Wen Gang
Published: November 2012

MEMS (Microelectromechanical Systems) electrostatic actuators have been successfully applied in a number of areas, including accelerometers, gyroscopes, pressure sensors, and optical devices. In this paper, the actuator optimization of a silicon bulk-micro machined MEMS compound electrostatic actuator of an optical device is discussed. The actuator uses folded-beam structure to enhance the electromechanical performance. The movable block is connected to the compound electrostatic actuator through unequal-height folded-beam springs. The lower-height springs connect the block with parallel plates, and can convert the descending motion of the plates into out-of-plane tilting motion of the block efficiently Additionally, the block is capable of in-plane motion by applying the driving force of the comb-drive actuator through structural connection. ANSYS FEM simulation is used to extract the device electromechanical performance and resonant frequency of the device. By gradually varying the design parameters in ANSYS simulation, the relationship between the actuator electromechanical performance and various design parameters is derived. The curves of actuator electromechanical performance versus beam length and beam height are derived and they are in good agreement with theoretical prediction. From the analysis it is concluded that the actuator behavior strongly depends upon various actuator parameters. By adjusting design parameters, desired electromechanical performance can be obtained. Based on the simulation results, a set of optimized design parameters for the compound electrostatic actuator is decided. The above-proposed MEMS compound electrostatic actuator may be used for many applications, such as optical device and micro-operating.
Analysis of the Damping Properties of High-Transmission-Ratio Cycloidal Drives
Authors: Kumar Naren , Kosse Vladis , Oloyede Adekunle
Published: November 2012

Cycloidal drives are widely used in today’s industries for drives where large reduction ratios are required. Drive-train dynamics plays an important role in their design. This paper presents a new methodology for assessing damping characteristics of Cycloidal drives and compares the natural frequencies obtained from experiments and theoretical/numerical calculations using Fast-Fourier-Transforms.
Optimization Design and Simulation of Negative-Pressure Removing-Chip Mechanism of Deep Hole
Authors: Wang Biao , Zhao Li Qin , Ma Qing Yan
Published: November 2012

In the deep-hole drilling process, chips can not be easily removed, so the influence factors of the negative-pressure removing-chips were analyzed on the existing DF negative-pressure removing-chip mechanism by the hydraulic pressure theory and the injection angle κ and negative pressure gap S were analyzed with FLUENT software. The results show that negative pressure effect were best in 32°of κ and 0.4 mm of S and negative pressure effect are better in 28°of κ and 0.5mm of S , which lay good theoretical foundation for the optimization and characteristics of negative pressure mechanism in near-dry deep-hole drilling.
Research on Modeling and Ratio Control Based on Axial Displacement Feedback for CVT
Authors: Xie Fei , Wang Jian Hua , Wang Yun Cheng
Published: November 2012

Considering the coupling effect between clamping force control and speed ratio control, this paper takes the axial displacement of primary pulley as the feedback of speed ratio control which can overcome the impact of external load and disturbance of outside environment. By choosing typical working conditions, simulation was carried out and the results showed that this control method had strong capacity of robust and decoupling, good dynamic response and stability.
Design and Simulation on the Rubber Conversion Track Wheel of the Loader
Authors: Hu Zhen Ning , Yao Kai , Tian Xin Min
Published: November 2012

The rubber conversion track wheel compare with the tyre has the adhesive performance well, the traction force big, well stability, compares with the steel caterpillar band chassis has the noise slightly, the quality light, the road surface non-damage merits.It can solve the wheeled vehicle the question which in the soft wet slippery location work ability drops. Based on the loader the rubber conversion track wheel design analysis results, has carried on the overall concept design to the loader track wheel.This plan uses the middle brace structure, the design absorption of shock stretching device, has solved the problem which track wheel bearing power small, the vibration and the caterpillar band tighten.Through to the loader track wheel straight line travel, climbing power, obstacle negotiation ability, changes ability the simulation analysis, has carried on the confirmation to the design proposal.The simulation result indicated that the loader track wheel road surface compatible, the climbing and obstacle crossing ability are good, change nimbly.
Structural Design of Banana-Stem Shattering and Returning Machine
Authors: Huang Yan , Mo Qing Gui , Wei Cheng Kun , Li Ru Zhong
Published: November 2012

A new banana-stem shattering and returning machine which was designed by using a roller to prevent fiber from tangling solved the problem of preventing the roller from being tangled by fiber in a better way. Field test showed that fuel consumption per unit time was reduced by about 4%, shattering rate improved by about 5%, and the banana-stem shattering quality and agronomic requirements were met. Through theoretical analysis and field test, the structures and main parameters of such key components as swinging cutters and cutter rollers were determined.
Further Exploring CFD-Based Gust Response of the Powered Parachute
Authors: Zhang Hao , Chen Zi Li
Published: November 2012

Researched the longitudinal model of the powered parachute , and dynamic numerical simulated the entire gust response in FLUENT . In the experiment, set of three different cycles that with different ranges of the oscillation over the same period by the dynamic mesh. Analyzed and compared the motion parameters against the steady-state, the same period oscillatory motion can effectively ease the impact on the aerodynamic characteristics. The simulation show that: the active exercise of reasonable design parafoil can inhibit the unsteady aerodynamic interference caused by the gust.
Effect of Mean Wind Speed Variations on Power Generation of Wind Farm
Authors: Guo Chen , He Yan
Published: November 2012

Through two methods, wind speed data sets sequence, the elements of which increased in Mean Wind Speed (MWS) orderly, are introduced first, and a numerical integration method depending on Weibull fitting result and power curve data to calculate Power Generation (PG) is proposed in this paper. Then, with measured data of 3 wind farms, PG with different heights are calculated and contrastive studies are made, employing the proposed data sets processing and PG calculating methods. Research results indicate that the PG calculating method has high reliability, and Equivalent Available Duration (EAD) increases about 50-60h when MWS increased by 0.1m/s. The results provide important basis for studies on the relationship of PG variation and measured data correction methods.
Simulation Analysis of the Working Process of the Corn Seed Metering Device with Combination Inner-Cell
Authors: Li Qing Long , Yu Ji Yang , Zhang Qiang Qiang , Yu Jian Qun , Fu Hong
Published: November 2012

A three-dimensional discrete element method analytic model of the corn seed metering device with combination inner-cell was established based on its 3D CAD model, and the three-dimensional particle model of corn seeds was built by using the method of combination spherical particle. The working process of the corn seed metering device was simulated and analyzed by self-developed three-dimensional CAE software. It was observed that the simulative results of the seeding performance, clearing angles and dropping angles of the corn seeds well agreed with the bench test results. A novel method for studying and designing of the corn seed metering device was put forward.
The Kinematics Analysis of Double Crank-Slider Mechanism Based on Simulink
Authors: Su Quan Wei , Wang Xiao Kan
Published: November 2012

Simulating and analyzing the kinematics model of double crank-slider mechanism with Simulink tools of MATLAB platforms.The mechanism is a system that its kinematic equations can construct the simulation model,and its initial position may determine the relevant parameters of the model,by this way can obtain the simulation results of the kinematic parameters.Finally,take the main transmission mechanism of the the platform printing machine as an example to verify the accuracy and effectiveness of the proposed method.
The Study on the Smart Reference of Movie Arts Applied in Dress Design
Authors: Zhang Yu Jing , Liu Ya Nan , Tang Di , Shao Tian Jiao , Wu Xue Chen , Wang Dong Ming
Published: November 2012

As the starting point of the movie, the invisible art of film and television with visible clothing art to be expressed, this is the perfect combination of art. The inseparable relationship between clothing and movies, as an art form, clothing is a national and regional cultural and aesthetic appeal of the carrier. Dress as important elements of costume elements, which lead the development of garment industry. The purpose of this paper is to dress in reproduction from the montage and the screen even as the story two dress designs innovation of new ideas on dress innovative design.
Study on Development & Design of Product Service System
Authors: Yu Yi Xiang , Liu Zheng Gang , Li Xiao , Chen Chou Yong
Published: November 2012

To achieve sustainable development of human society, it can not only rely on eco-design. We need more comprehensive design that integrate economic/social issues, especially design of the product service system (PSS). A value gap model of PSS development & design is put forward by using service quality model in marketing science. Based on the value gap model, the principle and process of PSS development & design are proposed, which require the consideration of supply and demand with bio-directional perspective. Focusing on the analysis of value gap, the new stereotypical model of PSS development & design is built, including the state parameter and the value conflicts of all stakeholders. Thus, the process of PSS development & design could be quantitatively and rationally evaluated.
Analysis of Cold Protective Clothing’s Design and Market - Functional & Structural Design
Authors: Wu Chun Yan , Qu Chang Feng , Song Guo Wen , Xu Lan Bing , Zhang Yu Jing
Published: November 2012

Relationships of cold protective clothing design and market were explored for apparel function and structure, and cold protective clothing company product to successful meet market demand. People require a large number of outdoor cold protective clothing that makes a chain of market, designer, consumer and manufacturer. They are not only focus on apparel functional comfort but also garment style preference structural design. Sophisticated new technologies are available to the apparel industry to create automated custom-fitted clothing, using 3-D body scanning and software designed to automate patternmaking to effectively improve productivity [1]. Currently, the quantification of fit is complex and ambiguous and objective methods. The purpose of this study was to explore the cold protective clothing manufacturer should have the necessary conditions on function and structure for the market demand.
Optimum Design for Improvement of Roller Bearing Load Distribution in a Medium Scale Mill
Authors: Li Ming , Sun Li Na
Published: November 2012

In roller bearing reformation of a medium scale mill, the micro-dimensional theory of mill is adopted. A new space self-alignment roll system is developed, including a divided base. This ensures the statically determinate of the mill under both light duty and heavy duty conditions. So the load distribution of roller bearing can be improved, and the bearing will have a long life. Since the new roll system began to run, it is in a fine motion until now. The roller bearing has exceeded its specified life. The design aim of service longevity is realized.
Evaluation Model for Product Green Design Based on Active Remanufacturing
Authors: Wang Li Li , Zhang Zheng Mao , Chen Chong
Published: November 2012

In order to optimize product design, to improve product manufacturability, to resolve the status of current production’s passive remanufacturing, this paper proposed the concept of active remanufacturing design oriented to product green design. The improved model of active remanufacturing product design was established and divided into four stages which are product remanufacturability analysis, optimization design, design parameter feedback and remanufacturability evaluation. Through the establishment of product design green system analysis and evaluation model, a design thought was proposed to evaluated design scheme comprehensively and select a preferable remanufacturing of green products. Finally, the model's validity and practicability are validated by the example of a new design of NC machine tool.
Design Optimization of the Flexspline in Harmonic Drive
Authors: Dai Juan , Chen Li Zhi , Pang Xiao Bing
Published: November 2012

In order to reduce the weight of harmonic drive (HD), the total volume of flexspline and circular spline was formulated and used as an objection function. Under the constraints including the condition on the strength of flexspline, the condition on averting the tooth top interference, the condition on the transmission ratio of HD and the geometrical constraint conditions of flexspline, a design optimization model with mixed discrete variables was established. For directly applying the optimal design solution of flexspline to manufacture, a manufacture-oriented method for dealing with mixed discrete design variables was used and the established model was solved by using an improved compound genetic algorithm. An optimal design example of flexspline was given and it shows that the proposed method is practical and effective.
Product Pedigree Based Conceptual Structure Evolutionary Design
Authors: Wang Xing Zu , Yang Bo , Yao Kong , Gao Chang Qing
Published: November 2012

By applying biological pedigree concept into product conceptual structure design, an conceptual structural design approach is set forth to make full use of creative and innovative intelligence of living systems for design automation. According to the relationship between different product structures with same function, the classification model of product pedigree is established, which can be used as unified functional isomorphic model during the intelligent conceptual design process. On the other hand, according to the evolutional logic from quality change to quantities change, pedigree based product evolutionary design strategy is given. Product pedigrees which are homology dependent are used as basic evolutionary models, based on which, the parameter based, interaction field based and interaction mater based evolutional conceptual design method are proposed, respectively. Based on the relation network of the pedigree units, multiple variant design schemes can be obtained, which is a strong backbone to the innovative design process. Finally, design examples are used to demonstrate the successful application of the proposed pedigree based evolutionary method in the product variant design.
Vibration Analysis of Main Shaft of Paper Advance Mechanism Based on Laser Doppler Vibrometer
Authors: Zhao Rong Li , Chen Xin , Li Ke Tian , Chang Zhou
Published: November 2012

Modal analysis was done to steel shaft and rubber shaft, and their top ten orders of nature frequency were obtained. The lowest nature frequency of steel shaft is 64HZ and the rubber steel’s is 2.2463HZ. Doppler vibration measurement was done to main shaft of paper advance mechanism and the time domain signal and frequency domain signal were obtained when the rotational speed is 80, 160, 240, 320, 400 Rpm. The frequency and amplitude were obtained by signal analysis. It proves that the nature frequency of steel main shaft is much higher than measuring result, but the seventh and eighth order nature frequency of rubber material is in accord with measuring result of laser doppler vibration.
Theoretical Research on Deformation of Porous Material in Air Bearing
Authors: Zhang Xiao Feng , Lin Bin
Published: November 2012

Due to the pressure difference between the restrictor’s internal and external, the restrictor’s performance comes under the influence of deformation in practical use. The analysis method combines the air lubrication analysis and structural FEM. The thickness, modulus of elasticity, fixation method of the porous restrictor was analyzed. The result illustrated that: the load capacity increases and stiffness decreases when the modulus of elasticity or thickness decreases. When the edges, annulus and center of the plate are fixed at the same time, the restrictor has the same load capacity and stiffness as that the deformation is neglected.
Design of a Dynamic Stall Test Rig
Authors: Shun Simon , Ahmed Noor Alam
Published: November 2012

Dynamic stall is an aerodynamic phenomenon that may occur when an airfoil is subjected to rapid, cyclical changes in angle of attack with respect to the incident ambient flow. This phenomenon can often produce repeated and significant changes in lift and moment coefficients within very short time frames, which manifest as severe and rapid changes in structural loads. Rotorcraft such as helicopters and wind turbines are particularly susceptible to dynamic stall, which is a highly undesirable operating condition. The condition plays a part in limiting the forward speed of a helicopter whilst also producing cyclical loads that accelerate fatigue. The structural issues are more severe for wind turbines, where blade spans approaching seventy to eighty metres are becoming common. Research into techniques for reducing the severity of the undesirable effects of dynamic stall is often conducting in laboratory environments using wind tunnels as the main investigative tool. The required cyclical changes in angle of attack are achieved by using machines that oscillate the test airfoil about an axis parallel to the span of the wing. Such mechanisms can be powered electrically, mechanically, pneumatically or hydraulically, and have various combinations of complexity, advantages and disadvantages. The current work describes the design process of an electrically powered dynamical stall test rig. The use of CAD / CAM to assist in the performing of design calculations and a comparison of the rig with other mechanisms is presented.
Research on Modeling Method for Equipment Maintenance Strategy Based on Reliability and Residual Life
Authors: Chen You Ling , Ma Ya Xuan , Zhang Dou , Tang Juan
Published: November 2012

This paper deals with the research on method for the optimum equipment preventive maintenance strategy based on equipment reliability and equipment residual life in indirect condition monitoring. We use the Markov chain to express the equipment deterioration condition and propose the equipment reliability function; besides, study on the equipment condition probability distribution and establish the equipment residual life model by using the Bayes rule and the hidden Markov model, based on the above research background, we obtain the optimum maintenance decision criteria by analyzing the equipment maintenance strategy based on equipment reliability and equipment residual life in indirect monitoring. Finally, a case study is given to illustrate the implementation of the optimum maintenance decision criteria in indirect monitoring.
The Analysis and Research on the Influence of Machining Center Stiffness because of the Bolt-Connection
Authors: Zhang Gong Xue , Han Bing Bing , Shen Xiao Kai
Published: November 2012

In this paper we establish a model of DVG850 machining center, and analysis the influence of bolts layout in the model on static stiffness. We got one hundred groups of stiffness data about different sizes of bolts through Workbench. Then the paper creates a 3D-graghs of different bolts, flanges and displacements, it also created a profile between flange-thickness and column-displacement. Though the dates and graphs it can find that stiffness of the hole machine will be influenced by the size of bolts and flanges directly ,also some better groups will shown in profile. Besides, relevant function is simulated by numerical methods. The conclusion provides a basis for the choice of better structure and can guide the analysis connection stiffness.
Vibration Response Analysis and Experiment on 2.0 MW Wind Turbine Gearbox
Authors: Wu Guo Yang , Liao Yi Jian , Jiang Cheng Rong
Published: November 2012

In order to get a reasonable working condition, using lumped parameter method and (Finite element method)FEM, a coupling dynamic model of the wind turbine gearbox is established. Analyze the natural characteristics and dynamic response in different conditions, and experiment study using operational modal test is carried out. Comparing the experimental data with the FEM result, vibration of the gear box in the rated power condition is the most stable, while vibration becomes violent when overload, it matches well with the other one, it is verified that the model is reasonable. This paper provides theory support for wind turbine gearbox design and analyze.
Estimating of Aerodynamic and Analysis of Aeroelasticity for Hypersonic Projectile
Authors: Peng Zhi Ling , Wang Zhi Jun
Published: November 2012

Dased on the analysis of characteristics of flow around slender body, this paper analyzes aerodynamic force and aeroelastic of slender body.
Influence of Phosphorous on the Tribological Properties of PM Iron-Based Sintered Composites
Authors: Jiao Ming Hua , Su Bai Wan , Ma Shao Bo , Wan Bing Chao , Yin Yan Guo
Published: November 2012

A new mixed method is adopted to make the powders mixed into bond particles, which is prepared for the PM iron-based sintered composites. The influences of phosphorus content on the physical properties and the frictional and wear properties of composites were analyzed in this paper. The morphology of frictional surface was confirmed by scanning electron microscopy. The results show the phosphorus addition may increase the matrix hardness and the anti-adhesion and anti-scratch behaviours significantly, and improve the anti-friction property and load carrying capacity of iron-based P/M composites. The composites containing 0.3 wt% of phosphorus has the optimal wear and frictional properties, and the self-lubricating performance is also improved obviously.
RETRACTED: Study of Parylene-C Thin Film Deposited on Flat Substrates
Authors: Tsai Fa Ta , Chuang Chin Tun , Li Tsai Cheng , Yu Pei Chi
Published: November 2012

Retractes article: This work aims to enhance the surface wettability and adhesion of Parylene-C (poly-chloro-p-xylylene C) thin film on PMMA, glass and aluminum substrates by chemical vapor deposition. The results show that: (1) 0.56, 1, and 1.55g Parylene-C powders can deposit 200, 400, and 600nm films, respectively. (2) After oxygen-plasma pretreatment, the surface roughness of the 200nm-thickness film on glass substrate specimens decreases from 18nm to 7nm. (3) After dipped in prescription solution pretreatment, the residual stress reduces from 107MPa to 64MPa on glass substrate specimens. (4) In contact angle tests, the 600nm-thickness film on various flat substrates deposited process that has surface hydrophobic. (5) The critical load of 600nm-thickness film increases from 14.1 to 18.5mN, showing the substrate after dipped in prescription solution pretreatment can improve the adhesion of the Parylene-C thin film on flat glass substrate specimens.
Effect of Pouring Temperature on the Microstructure of HCCI/Steel Composite Hammer
Authors: Wei Ning , Wang Kai , Zhou Xiang Kui , Wang Qiang , Liu Qiang , He Ji Cheng
Published: November 2012

The hypereutectic HCCI/plain carbon steel bimetal composite hammer which has metallurgical combination layer were prepared by bimetal liquid casting method and the influence of the pouring temperatures on the microstructure of the hypereutectic HCCI and the combination layer were studied. The results show that lower pouring temperature was not benefit for refinement of primary carbide and formation of metallurgical combination layer. A bad metallurgical combination layer between two metals which were mixed along the interface exhibited at higher pouring temperature.
Influence of Grain Composition and Sintering Temperature on Performance of Silicon Carbide Refractory Material
Authors: Zheng Ming Yue , Guo You Fu , Bu Jing Long , Chen Yue Jun , Yu Li Xue , Wang Zhi Fa
Published: November 2012

Silicon carbide with diffierent granularity and three grain composition was used as raw material. Silicon carbide refractory material was prepared in oxidizing atmosphere at 1400 °C, 1450 °C and 1500 °C for 3 h. Performence of samples were researched by measurements of apparent porosity, bulk density, bending strength at room temperature, thermal shock resistance and thermal expansion rate, and analyzed by SEM. The results showed that samples sintered at 1400 °C have low thermal expansion rate and apparent porosity, high bending strength and bulk density, good thermal shock resistance, compact texture as well. It can be deduced that (1.0-0.5mm) / (0.5-0.1mm) / (45μm) / (5μm) = 50 / 17/ 20/ 13 is the best grain composition to improve integrated performance of silicon carbide refractory material.
Research on Fire-Resistant Fabric Properties of Basalt Fiber
Authors: Pang Yu , Zhong Zhi Li , Liu Hua Wu , Rao Liang Kui
Published: November 2012

Fire retardant performance is an important indicator of fire-resistant fabric, and a major part of fabric protective properties, which has a great relationship with raw materials and weaving processing parameters of weaving. In this paper, basalt fiber were used to make fire-resistant fabric due to the superior properties of heat resistance, anti-oxidation, radiation, insulation of noisy and heat, filtration and high compression strength and shear strength. The fabrics of different weaves were produced on a sample loom. Then the properties, such as abrasion durability, fire resistance, reaction to acid and alkali were measured for evaluation. The results revealed that basalt fiber has great advantages for producing fire-resistant fabric.
Effects of Cross-Linking Agents on Synthesis of Heat-Resistant Resin from Ethylene Tar
Authors: Shi Yang Yang , Wu Ming Bo , Wang Yu Wei , Li Shi Bin
Published: November 2012

Ethylene tar (ET) was utilized as raw material, 1,4-benzenedimethanol and trioxane as crosslinking agent to prepare condensed poly-nuclear aromatic resin (COPNAR). FT-IR, 1H-NMR, TGA, elemental analysis, and improved Brown-Ladner calculation were systematically conducted for ET, COPNAR, and COPNAR/graphite composites prepared via graphite molding. The ET average molecular structure parameters were calculated using improved Brown-Ladner method, the crosslinking agent was found an important factor for the COPNAR synthesis, and the obtained COPNAR and CONPAR/graphite composites exhibited highly beneficial heat resistance.
Synthesis and Characterization of Thermally Stable B-Doped Polycrystalline Diamond
Authors: Huang Hai Liang , Wang Dan , Zheng You Jin , Zuo Gui Hong , Yin Long Cheng , Jiang Hong Wei
Published: November 2012

In this study we report on the synthesis and characterization of thermally stable polycrystalline diamond (PCD) using Ni-based alloys catalyst as a sintering aid and the B-doped diamond powder in the infiltrating way. The samples were treated at 5.6 GPa and 1200–1480 °C for 10 min in China-type cubic high pressure apparatus. Scanning electron microscopy showed significant intergrowth of the diamond particles sintered in the presence of Ni-based alloy. X-ray diffraction showed the phase change of the samples sintered at the different temperature. Differential thermal analysis (DTA) and thermogravimetric analysis (TG) showed the sample was significantly more heat-resisting compared to conventional PCD. The results showed that the appropriate conditions of thermally stable PCD sintered were 5.6GPa and 1200–1480 °C.
Synthesis of a Novel Hexanedioyl Thiourea Resin and its Adsorption Properties for Ag(I)
Authors: Wang Zhong Nan , Zhong Hong , Wang Shuai
Published: November 2012

A novel hexanedioyl thiourea chelating resin(HTR) was synthesized through interfacial polymerization of hexanedioyl diisothiocyanate and polyethylene polyamine. Its structure was confirmed by FT-IR. The adsorption properties of HTR for Ag(I) were investigated by batch operation . The results show that the adsorption equilibrium of HTR for Ag(I) is achieved after 12 hour at 20°C, the equilibrium adsorption capacity is 4.56mmol/g and increases as the temperature or pH rises, the adsorption process accords with G. E. Boyd equation and Langmuir adsorption isotherm as well, and the silver-loaded resins can be quantitatively eluted by a solution containing 6% thiourea in 1mol/L HNO3.
A Study of Double-Coating of Hot-Dip Aluminizing
Authors: Hao Chen Gang , Liang Han Qing , Zeng Jian Min , Chen Jun , Chen Ping , Xiao Jian Qiang
Published: November 2012

Double-coating of hot-dip aluminizing is a process of protecting steel from being oxidized. The process is featured that the component is firstly hot-dip galvanized and finally hot-dipped with aluminum. The comparison of interface morphology was conducted for single hot-dip aluminizing and double-coating of hot-dip aluminizing on Q235 steel sheets. The metallographies of the cross-sections were observed and analyzed with SEM, XRD and EDS, respectively for the specimens prepared by the two processes. The experimental results indicate that there is no Zn-Fe alloy layer formed in the double-coating, and both single and double coating have similar phase compositions. However, the interface between the alloy layer and the steel matrix is smoother for the double-coating than that for single-coating.
Effects of Heat Treatment Conditions on the Mechanical Properties of AA 2024 Alloy
Authors: Halkaci Huseyin Selcuk , Turkoz Mevlut , Yiğit Osman
Published: November 2012

Aluminum alloys have good properties such as high strength-to-weight ratio, corrosion resistance and relatively low cost. Nowadays they are primarily used as wrought and cast in many industries such as automotive, aviation and aerospace because of these properties. Aluminum alloys are classified into two categories as non-heat-treatable and heat-treatable. The mechanical properties of the heat-treatable alloys are improved by solution heat treatment and controlled ageing. While mechanical properties of some heat-treatable alloys, especially 2XXX series, become stable with natural ageing at room temperature within a few days, some of them are unstable and exhibit significant changes in properties even after many years. Heat treatment process of AA 2024 is very sensible and critical and therefore should be carefully performed. In this research, effects of the solution temperature, soaking time, heating rate and quenching delay condition of AA 2024 on the mechanical properties were investigated.
Research of a Plasma Arc Metal Surface Strengthening Robot
Authors: Zhao Tie Jun , Tai Li Gang
Published: November 2012

The technology of metal surface strengthening with plasma arc has quite different characteristics of High frequency quenching. The results similar to that of the laser beam. The properties make it possible that develop a plasma arc heating robot as a portable device for the case surface strengthening of steels. The characters of the plasma are analyzed at first, then the plasma arc as Guess distribution circular heat source is studied to create the surface strengthening temperature field and heating process. The surface strengthening technology and the hardware design of the plasma arc surface- strengthening robot is given.
CFD Modelling of Cadmium Telluride (CdTe) Thin Film Coating with Inline AP-MOCVD
Authors: Wu Yi Yi , Yang Xiao Gang , Huang Xiao Bing , Barrioz Vincent , Monir Shafiul , Irvine Stuart , Kartopu Giray
Published: November 2012

A CFD numerical model has been established to study the growth of cadmium telluride (CdTe) on substrate using metalorganic chemical vapour deposition technique in atmospheric pressure (AP-MOCVD) and hydrodynamics in an inline MOCVD reactor. The numerical simulations have been conducted using the CFD code – ANSYS Fluent. Dimethylcadmium (DMCd) and diisopropyltelluride (DIPTe) have been employed as precursors while H2 is acting as the carrier gas. In order to assess the effect of various conditions on CdTe film growth and uniformity, heat transfer and mass transport behaviours of the chemical species in the reactor have been fully investigated. In addition, material utilization and fluid dynamics in the reactor are also discussed.
A Study on Stoma Arrangement of Air-Cushion Lamination and Numerical Simulation of the Pressure Field
Authors: Gao Bo , Zhang Xiao Gui , Cai Ji Fei
Published: November 2012

Cushion has a wide range of applications in engineering. It is a new attempt to use it in the field of printing and packaging lamination process, to get a numerical simulation study analyzes for the distribution of the formation pressure of the air cushion pressure chamber. On the basis of analysis of the principle of air-cushion laminated device, make it clear for the requirements of the air cushion pressure distribution, pressure distribution from a single stomatal mathematical model, using ANSYS finite element software, numerical simulation of multi-stoma pressure distribution. The results showed that: stomata arranged in the form of cushion thickness, stomatal spacing and stomatal row spacing uniformity of the distribution greater impact on the cushion pressure; small stomatal spacing and stomatal row spacing will help improve the air cushion pressure distribution uniformity; reasonable cushion thickness stomatal spacing and stomatal row spacing, the selected diameter of the pores smaller cushion pressure distribution uniformity.
Numerical Study on a Drop-on-Demand Micro Droplet Print Head
Authors: Zheng Cheng Jian , Gao Sheng Dong , Yao Ying Xue
Published: November 2012

A conceptual design of a drop-on-demand(DOD) micro metal droplet print head, which is characterized as the non-heat affection of piezoelectric actuator and a desirable controllability on droplet condition, is devised. With a 2D axisymmetric model and a VOF model, the droplet evolution is simulated for understanding the mechanism within. Parametric studies are followed to investigate relationship between droplet condition and print head parameters for realizing accurate control of droplet condition.
The Simulation on Double Tank Water Level Control Based MATLAB
Authors: Zhang Hai Yan , Zhang Li Xiang
Published: November 2012

The paper aims at the simulation on double tank water level control based on MATLAB .Double tank water level control belongs to large time delay system. In this paper, adopted PID method to control the system, Then, fuzzy PID control method was used to adjust this second-order system. And the simulation model of this system is built with MATLAB Fuzzy and SIMULINK. And at the end, analysis the system stability ,reaction velocity and so on.
The Sensibility of Mold Dilation and Graphite Precipitation for the Simulated Porosity in Ductile Cast Iron
Authors: Yun Yu , Jing Hu , Li Xiao Ping
Published: November 2012

The formation of porosity in 40mmx200mmx100mm ductile cast iron test block under different conditions of mold dilation and graphite precipitation has been investigated based on The formation of porosity in 40mmx200mmx100mm ductile cast iron test block under different conditions of mold dilation and graphite precipitation has been investigated based on MAGMA software. The simulation results show that the variations of graphite precipitation have evident influence on the formation of porosity, while the variations of mold dilation have little influence on the formation of porosity in ductile cast iron. Because the graphite precipitation is a sensible factor for the formation of porosity, its exact value should be determined based on the metallographic analysis, the simulation results were in good agreement with the experimental results. Because the mold dilation is an insensible factor for the formation of porosity, it is commonly considered to be stable; however, the simulation result falls short of the experimental results when the mold is weak green sand.
Corrosion Resistance of E-Glass Fiber in Simulated Oilfield Environment
Authors: Li Hou Bu , Qi Dong Tao , Zhang Shui Hui , Ding Nan , Cai Xue Hua
Published: November 2012

Corrosion behavior and mechanism of E-glass fiber in simulated oilfield environment including CO2, H2S and Cl- were firstly studied. After simulated corrosion test, morphology of E-glass fiber was gathered using SEM. Chemical bonding status and elemental analysis were systematically investigated by XPS, FT-IR and EDS. The results revealed that corrosion of E-glass fiber in simulated oilfield acidic medium was primarily attributed to ion exchange mechanism, which was not only controlled by acid concentration, but also dominated by formation of complex ions or insoluble salts. The depletion of cations on E-glass fiber surface can disrupt the continuity of glass network, therefore reducing the strength of fiber.
Modeling Flow Stress and Microstructural Development during Hot Working
Authors: Jin Zhao Yang , Cui Zhen Shan
Published: November 2012

A cellular automaton (CA) model was established to predict and control the microstructural evolution and flow stress characteristic during dynamic recrystallization (DRX). Values of model parameters were identified by a flow stress-based inverse analysis method; their variations with deformation conditions were estimated by the least square regression method and then integrated into the CA model. The effect of initial microstructure and deformation conditions on the microstructural evolution and flow stress behavior were investigated. The simulation agrees well with the experiment, which demonstrates the availability of the CA model.
Parameter Identification Model with the Control Term in Batch Anaerobic Fermentation
Authors: Xiao Hong Li , Zhang Shu Xi , Xiu Zhi Long , Feng En Min
Published: November 2012

In this paper, according to the characteristics, dynamical behavior and the experimental data of the batch anaerobic culture, a parameter identification model was improved to describe the dynamical system for microorganism in batch fermentation. And some relative characters were introduced. Finally, a PSO algorithm with the inertia weight was used to get the best optimal parameter of the identification model. The results show that the model reduces the errors between the experimental data and computational values, and they can simulate the process of batch fermentation better.
The Research of Drilling Processing Technology Based on Fuzzy Optimization Design
Authors: Zhang Hui Xia , Zhan Hong Wei
Published: November 2012

Based on fuzzy optimization design ideas, system fuzzy decision-making theory and fuzzy optimization theory are adopted to conduct optimal design on the drilling processing technique of main pin hole of vehicle front shaft in this essay. By analyzing controllable factors and boundaries fuzziness, confirming objective functions, a satisfying result has been acquired, which indicates that fuzzy optimization design theory has good application foreground in drilling processing industry.
Emerging Solutions in Modeling of Asymmetric Threats Regarding the Aeronautical System
Authors: Cioaca Catalin , Cîrciu Ionică , Ciudatu Eduard
Published: November 2012

This paper concentrates on the practical applications of game theory in the field of aviation security system. The purpose of this analysis is to demonstrate the use of mathematical device in an interactive decision-making environment in order to analyze real-world problems: terrorism threats. Making the link between game theory and linear programming effectively supports the decision making process in resolving conflict situations that may arise between the attacker aviation system, situations which are characterized by low probability of occurrence and serious consequences. Modeling such phenomena as a result has a systematic and effective risk assessment of such attacks. To demonstrate this approach, two simple examples of a terrorist attack against an airport infrastructure are modeled and analyzed.