bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on the Customer Characteristic-Driven Innovative Design Method for Glasses
Authors: Wu Jian Feng , Li Hai Ying , Liu Xiao Jian , Xu Bing
Published: February 2012

The customer characteristic-driven innovative design method for glasses was described. A pair of glasses is a special product that should provide not only the perfect functions but also the “aesthetic emotion”. Thinking of these needs of users, the physiological characteristics were extracted from the user’s measurement data of head and face, and the psychological characteristics were identified based on user’s perceptual evaluation experiments at first. Secondly, the mathematical descriptions of different glasses components could be established to form the “component product families”. And then, the corresponding components of “product family” could be identified and selected based on the user’s features, and the product layout of the whole glasses could be achieved by the visual-interactive optimization method.
Research of Grain Moisture Measurement Method Based on Pressure Sensor
Authors: Li Jun Xing , Zhang Ya Qiu , Wu Wen Fu , Liu Zhe , Han Feng
Published: February 2012

This paper presents a grain moisture measurement method based on storage pressure. The system mainly includes the structure and circuit hardware design of a test sensor. The software system using visual programming language, combined with MATLAB, established a grain moisture model, to achieve the measurement on grain moisture. Finally, the experimental analysis was made on the system. The results show that this moisture measurement method is practical and stable.
Preparation and Photocatalytic Activity of Ag-TiO2/CNT Photocatalyst
Authors: Liu Jun , Xu Zhi Bing
Published: February 2012

Ag doped TiO2 was formed on the surface of carbon nanotube(CNT) by the sol-gel method, and characterized by TEM, XRD. The photocatalytic activity of the Ag-TiO2 /CNT was evaluated in degradation of methyl orange with a 300 W high pressure mercury lamp. Effect of Ag doping quantity on the photocatalytic activity of the photocatalys was investigated.The photocatalytic experiment indicated that the photocatalytic activity was firstly improved and then decreased with an increase of amount of Ag doped in TiO2 nanoparticles,the optimal doping quantity was 0.8% silver （ mass fraction of TiO2）, methyl orange could be degraded 99.3 % by Ag-TiO2/CNT under the optimal conditions after 120min.
Theory Simulations of Coaxial Bragg Reflectors with Gradual Change Ripples
Authors: Zhang Wen Chu , Ding Xue Yong , Xie Yong Chao
Published: February 2012

Based on the coupled mode theory and the FORTRAN software, study are carried out for the frequency response in a coaxial Bragg reflector with gradual change ripples. Results show that the characteristics of frequency response in the positive gradual change or the negative gradual change ripples coaxial Bragg reflector are the agreement, and the bandwidth of the coaxial Bragg reflector with gradual change ripples can be expanded as the gradual angle augmenting when the incident mode is Single-mode and lower frequency; When the incident mode is Coupled-mode and higher frequency, the bandwidth of the operating mode and the spurious mode also all can be expanded as the gradual angle augmenting, but the negative gradual change ripples can get higher frequency than the positive gradual change when the gradual angles are same; and the residual side-lobes of the frequency response also can be effectively suppressed. These characteristics of a gradual change ripples coaxial Bragg reflector are favorable to improvement of the performance as a reflector or a filter in its applications.
Machining Sequencing Optimization Based on Simulated Annealing Algorithm
Authors: Qiao Li Hong , Hu Quan Wei , Zhang Hong Wei
Published: February 2012

Distributed geometric features such as adjacent auxiliary holes with certain tolerance requirements are common geometry to be machined in many complex structural components. The machining sequencing decision of such features has high impact on the machining efficiency of the part. This paper conducted an algorithm to generate optimal machining sequence of the distributed holes in a machined part by using simulated annealing. The procedures of the algorithm were introduced. Distributed holes machining of an example part has been considered in the paper to exam the algorithm to find an optimal machining sequence of the holes in the row blank operation. The impacts of algorithm parameters on the results such as the starting annealing temperature, temperature coefficient and iterations are studied. Comparisons of the machining route before and after optimization were performed. According to the optimized sequencing, total distance and transfer time of cutting tools were greatly shortened. Therefore, the machining sequencing optimization of distributed holes can raise the machining efficiency in practice and has great significance.
Steel Ball Temperature Uniform Distribution Time Calculation Method in Annealing Process
Authors: Wang Xiao Zeng , Yang Jiu Hong
Published: February 2012

The paper presents a fitness formula which is adopted to calculate the steel ball temperature uniform distribution time in the annealing process, analyses the steel ball temperature distribution in the process of heating. After the heat conduction equation of the steel ball is deduced, the spherical bessel function is adopted to solve it. The temperature distribution series solution is obtained. Using this formula, the steel ball temperature uniform distribution time of the different radius is calculated in the process of annealing. The result shows that the steel ball temperature uniform distribution time is the quadratic function of the steel ball radius. The time and radius data is adopted to deduce a second-order fitness polynomial. The steel ball temperature distribution is obtained in the different position. The steel ball temperature uniform distribution time is calculated by the fitness formula and the temperature distribution series one. The error between them is only 0.03%. The fitness formula can be used to calculate the steel ball temperature uniform distribution time. The change of the steel ball surface temperature is more severe than the internal. It often results in the crack of the steel ball in the annealing process.
Equilibrium Analysis of Hydrogen Adsorption on Activated Carbon
Authors: Zheng Qing Rong , Gao Shuai , Jie Chen
Published: February 2012

For developing carbon based adsorbents for hydrogen storage, Staram PCTPro E&E was employed and activated carbon SAC-02 having specific surface area about 2074m2/g was selected to measure isotherms of hydrogen adsorption respectively from temperature range 77.15K-110.15K and 253.15K-293.15K. Isosteres of hydrogen adsorption on the activated carbon was then plotted to determine the isosteric heat of hydrogen adsorption, and temperature dependent of Henry law constants were further applied to set the limit isosteric heat of adsorption at zero surface coverage. Results show that the isosteric heat of adsorption is about 3.6-5.4kJ/mol with a mean value 4.38kJ/mol at zero surface coverage. Results also reveal that adsorption isosteres of adsorption data at different temperature regions bring about a different isosteric heat of adsorption due to the variation in contributions from thermal motion of adsorbate molecules. Conclusions are drawn that adsorption isosteres on the adsorption data in correspondence with the lowest and highest temperatures of the hydrogen storage system should be carried out to determine the isosteric heat of adsorption for effectively managing the thermal effect.
Solving Seepage Problems in Soils using Element Free Galerkin Method
Authors: Marandi S. M. , Rahmani Firoozjani Y. , Safapour P.
Published: February 2012

Abstract:Seepage is an important issue in geotechnical engineering projects such as dams, levees, canals, reservoirs, etcetera, and has made researchers and specialists to pay special attention to this problem. Lots of destructions in buildings, towers, dams, tunnels, slopes, and etcetera have been reported in history which, have been caused by liquefaction, ground water movement or other related seepage problems. In this article, seepage in soil-water systems and their related problems are studied using Element Free Galerkin Method (EFGM). For time dependent problems, implied finite difference method is used. A program is also written for both stable and time dependent cases. With estimation of a function and comparing the results with the exact function, the quantity of the errors is calculated and the accuracy of the method is evaluated. Based on this method, various geotechnical engineering problems are solved and analyzed. The results showed that not only is the EFGM more exact and accurate in comparison with other conventional methods but the time and costs for network production is omitted. With variations in boundaries, the application of EFGM is easier than that of Finite Element Method (FEM). Also, the ability of solving seepage problems without any limitation is a preference of EFGM in comparison with other approximate methods.
Remote Monitoring System of Textile Equipments Based on ZigBee Technology
Authors: Zhang Xue Song
Published: February 2012

In textile enterprise, the monitoring and maintenance of equipments is a big problem. There are many inconvenience by traditional wiring way, and this paper puts forward a remote monitoring system based on ZigBee technology with low cost and high efficiency. Through ZigBee network, this system transfers the data collected from on-the-spot equipments to center control computer, so as to realize the remote monitoring. The monitoring system has the advantages of network organizing flexible, low cost, big network capacity and so on, which particularly suitable for textile enterprise.
Coin Identification Based on Fusion Multiple Algorithms
Authors: Liu Gang , Yun Jin Tian , Chen Zi Wei
Published: February 2012

With the extensive use of coins in the financial sector, it is necessary to develop an effective real-time method of identification. This paper presents a coin identification algorithm based on multiple algorithms fusioned and verifies the effectiveness of the algorithm in the simulation environment of Matlab. Through experimental analysis, the accuracy of the algorithm is high, and is not easily effected by external environmental factors.
Measurement Data Restoring Method of Shoe Last Based on Numerical Cutting Technology
Authors: Lin Li Zong , Cao Cheng Bing , Cui Hua Tao , Wang Sai Fei
Published: February 2012

From the perspective of Analytic Geometry, the spatial equation of milling cutter rotary surface is obtained. According to the measurement and machining of shoe last, a new measurement data restoring technology that is named Numerical Cutting is presented, and the Numerical Blade is defined. The working principle of Numerical Cutting Technology is introduced in detail, and it is used to restore the measurement data of shoe last. Then the discrete model of shoe last is gotten by shoe last CAD software. Finally, an application example of Numerical Cutting Technology is presented.
Study on the Scanning Entity Reconstruction Method of RP Reverse Engineering
Authors: Zhang Qi , Zhou Hui Qun , Yang Jing , Wang Xiu Ting
Published: February 2012

In the multi-view reconstruction process, the paper unifies more partial information into one by using the three-reference-point alignment method. With the research on the process of image extraction, the method can improve the quality of the reconstruction data. The paper uses software CATIA as the platform to create the reverse process system of the product images which validate the feasibility of this method.
Finite Element Simulation for TGO Instability with Crack Propagation under Thermal Cycling Based on Modified COD Criterion
Authors: Huang Xia , Ding Jun , Li Wen Zhong
Published: February 2012

In this work, the displacement instability of thermally grown oxide (TGO) occurring near the surface groove in Fecralloy substrate subjected to multiple purely thermal cycling, has been simulated coupled with crack propagation in TGO layer using finite element method. Due to insufficiency in the traditional criterion of crack opening displacement (COD), a modified COD criterion is employed to model crack propagation in TGO layer as thermal cycles in which the required input parameters are continually modified as thermal cycling based on the calculation result. The comparison between FEA and experimental results shows a good agreement indicating the validity and accuracy of the simulation, which may provide a solution for future works on more complicated case such as in thermal-mechanical cycling.
Investigation on Thermal Oxidative Stability of Coolant and Lubricant of Magnesium Alloy in Rolling Process Using TG–DSC Analyzer
Authors: Ouyang Mei Tao , Yu Wen Bin , Chen Zhi Qian
Published: February 2012

In the rolling process of Magnesium Alloy, different mixtures of organic and inorganic compounds are used to lower the friction. Such coolants and lubricants may age or deteriorate during use. This paper describes a method for evaluating oxidation stability performance of lubricants by TG–DSC analyzer. The influence of oxidation on the volatility of lubricants and the tendency of the formation has been studied by comparing the TG curves and DSC curve of lubricants obtained under 298K to 798K atmosphere. The results show that this method is potentially useful for lubricants selection and quality control and for studying influence of base lubricants composition on oxidation performance.
CNC Machining Simulation of Discharge Electrodes to Fabricate Models of DVD Boxes
Authors: Ni Jun Fang
Published: February 2012

The CNC programs which are automatically generated by software for cutting paths become more complicated while parts are complicated and precise, so it is difficult to assure CNC programs accurate. Discharge electrodes to fabricate models of DVD boxes are machined as case study in this paper, the CNC programs are verified accurately by simulation of VERICUT software.
Optimal Design of Dynamic Secondary Cooling of Continuous Casting
Authors: Wang Yi , Ma Xin Jian
Published: February 2012

Numerical simulation of the secondary cooling is applied to the design of continuous casting. The mathematical model for solidification process of the strand under air-mist was established and calculated with the finite element model. The model is used to calculate the feasible operating range of the continuous casting machines. The dynamic secondary cooling system has been analyzed with consideration of the thermo mechanical principles and numerical model. The adequacy of the model has been confirmed with experimental results.
Fatigue Test and Analysis on Subframe in Fuel Cell Car
Authors: Liao Jun
Published: February 2012

The work environment and the feature of the subframe have been discussed though the fatigue test on the subframe of original design. Fatigue simulation environment of the original subframe was established and analyzed under assistance of optimization software. After comparative analysis with test environment, the construction of the fatigue simulation environment model was considered more reasonable. Meanwhile, fatigue simulation analysis, under the original simulation model, was conducted on the subframe of new materials. After a comparative analysis with general steel subframe, it was concluded that fatigue life of new subframe was greatly improved while the lightweight.
Power Consumption Analysis of Polymer Solids Discharging Process in Vane Plasticization Extruder
Authors: Qu Jin Ping , Zhao Xiao Qiang , Li Jian Bo
Published: February 2012

This paper deals with the study of power consumption in the discharging process of polymer particulate solids in a vane plasticization extruder. The structure and operating principle of the innovational vane extruder are completely different with conventional screw extruders. The process of conveying materials in vane extruder is based on volume transportation. Solids conveying zone is the first section of polymer processing in extruder. Large amounts of energy are consumed in the zone. The solids conveying process is composed of feeding, compacting and discharging process in the vane extruder. The discharging process is very unique and worthy of further study because of the particularity of the vane extruder. A mathematical model has been developed to analyze the power consumption in the process. The model shows the structural parameters have significant influence on the power consumption. In addition, the model is verified by experimental results.
The Strategies of Energy Control of Parallel Hybrid Electric Vehicle and the Simulation Analysis of Energy Saving Efficiency
Authors: Cheng Fang Xiao , Zhang Bao Dong , Lin Xiao Mei
Published: February 2012

This paper refers to Nissan Tino series models as the research object, the power source of the vehicle makes reasonable distribution by a kind of optimization control strategy of the energy, in order to improving the efficiency of the energy conservation. The experimental data was compared by the advisor software simulation to control strategy, it is verified the effectiveness of the energy saving efficiency.
The Influences of Strain Rate on the Mechanical Behavior of Paper Honeycomb
Authors: Wang Dong Mei
Published: February 2012

The paper honeycomb is a strain-rate-sensitive material. It is significant to predict the mechanical properties of paper hoenycomb at different strain rate for optimizing packaging design. According to the Cowper-Symonds equation, the influence of the strain rate on the paper honeycomb was studied, and the characterization parameters were found by parameter fitting. It provides a reference for optimizing design of paper honeycomb.
Numerical Simulation of the Effect of Feedstock Shape on Continuous Extrusion Process
Authors: Chen Li , Song Bao Yun , Yun Xin Bing
Published: February 2012

Since the appearance of the continuous extrusion process, the section shape of the feedstock is round. The shape of the feedstock directly affects metal deformation and metal flow characteristics during the continuous extrusion process. Based on finite element method (FEM), using the Deform-3D software, this paper simulates continuous extrusion forming process for copper bus bar, and analyzes the effect of different feedstock shape on metal flowing temperature, velocity, rotating torque. The results show that: the size of the rectangular feedstock must be within a reasonable range, otherwise the continuous extrusion process can not be established; the rectangular feedstock is benefit to the flow uniformity comparing with the round feedstock; the temperature of the billet and tooling with rectangular feedstock is lower than that with round feedstock, as the feedstock width increases, the temperature decreases and the area of high temperature becomes smaller; the change of the feedstock shape and size has no effect on the extrusion wheel torque value.
Design and Optimization of Runner and Gating System for Magnesium Piston Casting through Numerical Simulation
Authors: Zhao Kang Pei , Li Jin Hong , Fang Qiang Han
Published: February 2012

As the lightest metal, magnesium is used as the basis for constructional alloys. A well-designed runner and gating system is very important to obtain a good quality die casting. Two types of runner and gating system for magnesium piston are designed and analyzed based on CAE software. The filling process, temperature distribution and quality predication are given respectively. Combined the solidification law, the distribution of the gas hole is effectively predicted and an optimized design is chosen. The research shows that trapezoidal gating system is better than point gating system for magnesium piston. Numerical simulation can be considered as the most cost-effective way in optimization of the runner and gating system.
A Study on Preparation Mechanism and Technology Law of Quartz Nano-Powder
Authors: Jin Yuan Qiang , Luo Rui
Published: February 2012

In this paper, The authors briefly introduced preparation mechanism of quartz nano-powder by ball milling, Analyzed the process parameters on the effect of quartz nano-powder preparation. used orthogonal experiment to study the test method of quartz nano-powders prepared by ball milling, applicated artificial neural network technology to build a prediction model of powder parameters based on BP network and optimized the BP network weights and improved the prediction model of quartz particle size based on BP network by using the global search capability of genetic algorithm . This study showed that the model has higher accuracy and realize acceptable prediction of powder particle size. The technology provided the theoretical guidance for further study on its parameters selection and the preparation of quartz nano technology industrialization.
Molecular Simulations of Hydrogen Storage on Several Nanoporous Zeolites
Authors: Liu Xiu Ying , Zhang Jun De , Fan Zhi Qin , Sun Wei Guo , Kang Guang Sheng
Published: February 2012

Zeolites belong to a most prominent class of nanoporous materials which have been considered as potential sorbents for hydrogen storage. The adsorption of hydrogen molecules on MFI, MOR and LTA zeolites, which encompass a range of different pore structure and chemical composition, has been simulated employing Grand Canonical Monte Carlo (GCMC) method. We compare their capacities of hydrogen storage at different temperatures and pressures. The results show that the adsorbed amounts is in order of LTA>MOR>MFI at the same condition. The effects of pore structure of zeolites, temperature and pressure on the hydrogen adsorption has been examined. The results clearly show that: (1) the temperature effect on the adsorption decreases with decreasing in the number of hydrogen molecules adsorbed. (2) A large volume of micropores and a suitable diameter near to the kinetic diameter of a hydrogen molecule are important for improving the hydrogen-storage capacity of zeolites. Based on this, we can conclude that the LTA zeolite with a large pore volume and a suitable channel diameter exhibits a most efficient hydrogen storage capacity than MOR and MFI zeolites.
Emulation and Prediction of the Cold Roll Forming Force
Authors: Wu Jin Gang , Li Qiang , Yan Yu
Published: February 2012

In order to optimize the craft parameter of cold roll forming, this paper puts forward a new method reflect the law between cold roll forming force and craft parameter. The method combines artificial neural network and finite element emulation for cold roll forming, and begins with analyzing the cold roll forming to decide the main factors that have an impact on roll forming force. According to the single factor experiment method, the paper establishes the roll forming emulation model to simulate, and a BP neural network is constructed with the sample data from the simulation.
Research on the Programming Method Based Process Planning and Kinematics for Mill-Turn Machine
Authors: Yao Zhuang , Yu Dong , Tian Jun Feng , Zheng Liao Mo , Hu Yi
Published: February 2012

With manufacturing industry tending to high-mix low-volume production, the turn-mill machining technology has recently received much attention. This research proposes the programming method using process planning and kinematic based on the existing problems during the course of the programming for the mill-turn machine. Firstly, through computing the volume of removal shape on the cylindrical blank shape, dividing the machining process for the spindles. Then recognizing the turning and milling process and computing their removal shape for obtaining tool path. According to complex configuration of the mill-turn machine, the machine kinematic chain is created to convert cutter location data generated into the NC data. Finally the effectiveness of the programming method is confirmed by machining experiment.
Preparation of BCB Powder and its Effects on the Sintering Behaviour and Microwave Dielectric Properties of MCT Ceramics
Authors: Huang Jin Liang , Gu Yong Jun , Li Li Hua , Li Qian , Yan Zhong , Lu Xiao Hui
Published: February 2012

The BCB (BaCu(B2O5)) powders were synthesized by solid state reaction method and its effects on the microstructures, the phase formation and the microwave dielectric properties of MCT (Mg0.95Ca0.05TiO3) ceramics were investigated. BaO and B2O3 first forms BaB2O4, and then BaB2O4 reacts with CuO forming BCB. The sintering temperature of MCT ceramics with as-synthesized BCB addition can be effectively lowered from 1450°C to 1100°C due to the liquid phase effect. The formation of second phase (MgTi2O5) was restrained. The 3wt% BCB-doped MCT ceramics sintered at 1100°C for 3h have optimum microwave dielectric properties of Kr=21.5, Q×f=28000GHz, and TCF=-3.3ppm/°C. Obviously, BCB could be a suitable sintering aid that improves densification and microwave dielectric properties of the MCT ceramics.
Model Establishment and Simulation of Vehicle Handling Stability Using Adams/Car
Authors: Meng Jie , Zhang Kai , Yang Bao Cheng
Published: February 2012

A vehicle model is built using the multi body dynamics software-ADAMS/ Car first. And then the vehicle’s performance of the constant radius cornering and ISO lane change is simulated. According to the simulation results, the handling stability is evaluated. The result shows that the ADAMS software can provide accurate simulation test and optimize the design plan of vehicle product.
Study on Performance Evaluation of Multi-Station Assembly System Based on Stream of Variation
Authors: Song Zheng Li , Shi Wei , Wang Jian Guo , Zhang Wen Xing
Published: February 2012

Based on stream of variation theory, parametric state space model of multi-station assembly process was built up. For problems of system-level evaluation index, the sensitivity evaluation index, soundness index as three methods of assembly system performance evaluation, the comprehensive stability index was presented. Parametric state space model was as a tool and the comprehensive stability index was as evaluation index to optimize the assembly lines, reduce the geometric deviation of product, improve the quality of product. Experiment verified comprehensive stability index can accurately evaluate the performance of assembly systems, improve the efficiency of optimizing assembly lines.
Aviation Pipe Connection Fit’s Contact FMA and its Structure Modification
Authors: Qiu Ming Xing , Wang Jian Jun , Wang Zhen Xing , Li Zhan Ying
Published: February 2012

The mechanics properties and improved structure design for an advanced typical aviation pipe connection fit based on contact FEA and ANSYS have been researched in this paper. First of all, by establishing a multi-body contact FEM for a connection fit, its contact mechanics properties and the simulation method of pretension torque are discussed. Then the mechanics properties and stress distribution in working condition for the original connection fit are calculated and analyzed. In the end, in view of the deficiency of stress concentration in the original design, the structure improvement has been discussed and fixed on, and at the same time the stress analysis for the improved connection fit is carried out. The study has shown that as an effective means to design a pipe connection fit and analyze its mechanics, the simulation method of multi-body contact FEA given in the paper can be used to analyze effectively the mechanics properties, and the structure improvement to the original connection fit can effectively get a better load properties and enhance its reliability.
Numerical Simulation and Impeller Optimization of a Centrifugal Pump
Authors: Zhou Shao Ping , Lv Pei Wen , Ding Xiao Xia , Su Yong Sheng , Chen De Quan
Published: February 2012

The three-dimensional flow field simulation of a centrifugal pump was presented by using commercial CFD code. In order to study the most suitable turbulence model, the three known turbulence models of Standard k-ε, RNG k-ε, Realizable k-ε were applied to simulate the flow field of the MJ125-100 centrifugal pump and predict the performance of the pump. The simulation results of head and efficiency were compared with available experimental data, and the comparison showed that the result of the numerical simulation by RNG k-ε model had the best agreement. Additionally, the effect of number of blades on the efficiency of pump was studied. The number of blades was changed from 4 to 7. The results showed that the impeller with 7 blades had the highest efficiency.
Effect of Mechanical Stresses on the Coercive Force of the Heterophase Non-Interacting Nanoparticles
Authors: Afremov Leonid , Kirienko Yury
Published: February 2012

The theoretical analysis of the effect of uniaxial stress on the magnetization of the system of noninteracting nanoparticles is done by an example of heterophase particles of maghemite, epitaxially coated with cobalt ferrite. It is shown that stretching leads to a decrease in the coercive force Hc, and compression leads to its growth. The residual saturation magnetization Irs of nanoparticles does not change. With increasing of interfacial exchange interaction, coercive force varies nonmonotonically.
Nanoindentation Test and Stress Fields Simulation of Hot-Pressed Silicon Nitride Ceramic
Authors: Qiao Guo Chao , Zhou Ming , Wang Ming
Published: February 2012

In order to investigate material properties of silicon nitride ceramic, nanoindentation tests are carried out on Hot-press silicon nitride specimen. The micro-hardness and elastic modulus are obtained. simultaneously, load-displacement curve is acquired. The whole process is simulated in ansys. Through comparing, there are satisfactory consistency between experimental curve and simulation curve. In addition, simulation can also indicate the distribution of stress fields during loading and unloading process. Base on these informations, the mode of cracks development and mechanism of material removal can be known.
Simulation of Indoor Environment Monitor Calibration Gas Mantle Based on FLUENT
Authors: Yang Sui Jun , Song Jia Ying , Hou De Xin , Ye Shu Liang
Published: February 2012

The concentration error of standard gas in different locations of calibration system will have different degrees of impact on accuracy of calibration results. Among them, concentration of standard gas in gas mantle that combine detection sensors and gas transmission pipelines show the greatest impact on calibration results. In order to realize monitoring and analysis of the overall calibration process, this paper simulated gas concentration change status during calibration process of indoor environmental monitor gas mantle by FLUENT software. Gas concentration change status and sensor measurement accuracy at situations of different size sensors placed in the same gas mantle at the same location and same sensor placed in the same gas mantle at different location were analysed. Simulation results show that to make gas most quickly and evenly filled gas mantle, gas mantle size should be slightly larger than sensor and sensor should be placed in the top of the mantle as far as possible. On this condition, it can ensure gas concentrations error range between sensor workface and the inlet are within ±2%, thereby ensuring the accuracy of calibration results.
Improvement on Microstructure and Cracking Susceptibility of Laser-Clad Ni-Based Layers by In Situ Generation of Tantalum Carbides and Borides
Authors: He Hao , Wang Dong Sheng , Liang Er Jun , Chao Ming Ju
Published: February 2012

Cracking is a serious problem in laser-clad hardfacing layers due to inhomogeneous distribution of coarse brittle phases and stress induced during rapid solidification. Tantalum carbides and borides which can form and precipitate at much higher temperatures are tentatively designed to inhibit the formation of the coarse brittle phases of chromium carbides and borides. It is found by XRD analysis that TaC, Ta4C3, TaB and Ta5B6 were formed in-situ and the coarse brittle phases were largely avoided in laser-clad Ni-based layers. It is also found that the formation sequence of these species is governed by their precipitation temperature instead of the rule determined by the standard free energy of formation. The formation of the chromium carbides and borides is inhibited due to the priority of formation of tantalum carbides and borides during rapid solidification. SEM and penetration visualization examinations show that the microstructure is markedly refined and the cracking susceptibility is significantly reduced by this method. The microhardness of the layers maintains at about 800 Hv.
Synthesis of CdMoO4 Microcrystals by a Molten Salt Method
Authors: Jiang Xiao Hui , Ma Jun Feng , Cheng Jie , Fang Jing Rui , Sun Yong
Published: February 2012

Cadmium molybdate (CdMoO4) nanoparticles, cube-like crystallites and octahedral microparticles have been successfully synthesized by a molten salt method at 270°C. The structure, morphology and luminescent property of the resultant powders were characterized by X-ray diffraction (XRD), transmission electron microcopy (TEM), scanning electron microcopy (SEM), and photoluminescence (PL), respectively. The resultant samples are a pure phase of CdMoO4 and without any impurities. PL spectra results show that the optical properties of CdMoO4 particles are strongly relied on their morphologies.
Investigation of Thermal Shock Behavior of Plasma-Sprayed NiCoCrAlY/YSZ Thermal Barrier Coatings
Authors: Jamali Hossein , Mozafarinia Reza , Shoja Razavi Reza , Ahmadi Pidani Raheleh
Published: February 2012

ZrO2-8wt.%Y2O3 (8YSZ) thermal barrier coatings (TBCs) were deposited by atmospheric plasma spraying (APS) on NiCoCrAlY-coated Inconel 738LC substrates. The thermal shock behavior was investigated by quenching the samples in water with temperature of 20-25°C from 950°C. To study of failure mechanism results from thermal cycling, microstructural evaluation using scanning electron microscope (SEM), elemental analysis using energy dispersive spectroscopy (EDS) and phasic analysis using x-ray diffractometry (XRD) were done. The results revealed that failure of the TBC system was due to the spallation of ceramic top coat. Thermal mismatch stress was the major factor of TBC failure in thermal shock test.
Contrast Test of KOH Solutions Jet-Assisted Laser Etching on Al2O3 Ceramics
Authors: Yuan Gen Fu , Zheng Wei , Chen Xue Hui
Published: February 2012

An experimental device of KOH solutions jet-assisted laser etching is designed, Laser-chemical combined etching technology is combined with the Medium-jet erosion processing ,and the influence on the etching capacity and cross section quality of material sample of laser processing parameters,jet processing parameters are studied. The results show that the laser processing parameters and jet processing have a decisive impact on the quality of the workpiece, the composite processing technology can remove most of melting slag which are produced by the laser processing, the surface roughness are effectively reduced. The blind holes of the machined materials have the regular shape.
Grouping Parallel Filling Scan Path Generating Algorithm of Metal Laser Deposition Shaping
Authors: Bian Hong You , Yang Guang , Wang Gang , Qin Lan Yun , Wang Wei , Cui Bao Lei
Published: February 2012

Those ultimate reasons of over-cladding and under-cladding are indicated through analyzing between the existing parallel scan mode and the characteristic of metal laser deposition shaping. A kind of scan path generating algorithm is presented based on only parallel filling scan, firstly, increasing scan line based on recognizing characteristic points is adopted which generate the scan filling line according to the set scan space; then, scan path is generated through grouping and optimizing to connect filling lines based on judging the distance of between the end point of last vector and the start point of next vector. Practical application shows that the scan path can effectively enhance the flatness of shaping layer and the fabrication quality, ensure to shape successfully.
Improving Thermal Shock Resistance of Plasma-Sprayed Yttria-Stabilized Zirconia Thermal Barrier Coatings by Laser Remelting
Authors: Duan Zong Yin , Wang Dong Sheng
Published: February 2012

This paper deals with the microstructure and thermal shock behavior of laser remelting of yttria-stabilized zirconia (YSZ) thermal barrier coatings (TBCs) deposited by plasma spraying. The microstructures of the coatings were analyzed by scanning electron microscopy (SEM). It was found that the as-sprayed ceramic coating had laminated structure with high porosity. However, the coating exhibited a dense lamellar-like layer with segment cracks on the remained plasma-sprayed porous layer. Thermal shock experiments for the two kinds of TBCs were performed by water quenching method. Testing result showed that the laser-remelted TBC had better thermal shock resistance than the as-sprayed one. The damage mode of the as-sprayed TBC was great-size whole spalling. In contract, the failure mechanism of the laser-remelted one was mainly local pelling. Segmented cracks of the top ceramic coatings caused by laser remelting improved the stress accommodation and were mainly attributed to the enhancement for thermal shock life of TBC.
High Power Diode Laser for Processing
Authors: Gu Yuan Yuan , Wu Guo Xing , Lu Hui , Cui Yan , Wang Hao
Published: February 2012

As diode laser is simple in structure, small size, longer life expectancy and easy modulation and the advantages of low prices, widely used in the industry processing, such as heat treating, welding, hardening, cladding and so on. Respectively, diode laser could make it possible to establish the practical application because of rectangular beam patterns which are suitable to make fine bead with less power. Therefore diode laser cladding will open a new field of repairing for the damaged machinery parts which must contribute to recycling of the used machines and saving of cost. in order to output high power, in this paper, we utilized polarization coupling technology to couple two 808nm laser diode stack together, and designed the optical system to expand and focus the beam, through the experiment, we realized the overall efficiency more than 60%, focusing the beam size of 2×2mm2.
Copper Ultrasonic-Electrodeposition on Zn Alloy in Alkaline Bath Containing 1-Hydroxyethylene-1,1-Diphosphonic Acid
Authors: Zheng Jing Wu , Li Dan , Ying Yao , Qiao Liang , Jiang Li Qiang , Zhang Cheng
Published: February 2012

Zn alloy die casting is easily corroded and porous, so it is hard to obtain the strong adhesion strength between the substrate and the metal coating. In this paper, Cu coatings were prepared by ultrasonic-electrodeposition on Zn alloy in a cyanide-free deposition bath containing a base agent of 1-hydroxyethylene-1, 1-diphosphonic acid (HEDPA). The effect of ultrasound on the electrochemical behavior of bath and the morphology of the coating were investigated by potential sweep and by SEM, respectively. Experimental results indicate that pre-treatments, such as electrolytic degreasing, have a remarkable influence on adhesion strength. Application of ultrasonic increases the limiting current density of cathode and enhances the throwing power of bath. Application of ultrasonic also promotes the formation of network-cross copper coating which enhances the adhesion strength between the substrate and the coating.
Experimental Study on Laser Plasticizing Polyamide 12
Authors: Tan Wen Sheng , Zhou Jian Zhong , Huang Shu , Fan Yu Jie
Published: February 2012

Considering the efficiency and microscale requirement of melting polymer in micro-injection process, we present an experimental analysis of the CO2 laser irradiating Polyamide 12 (PA12) based on the photo-thermal effect of laser-materials interaction. The orthogonal experiments of laser plasticizing were designed by Taguchi method of Minitab software, the influence of process parameters on PA12 plasticization was investigated, and the effect sequence rule of the experiment parameters to melting depth was analyzed. Accordingly，the optimal process parameters combination on PA12 plasticization were obtained，i.e. laser power 3 W, beam diameter 2 mm, scanning velocity 200 mm/min, scanning distance 0.5 mm and environment temperature 20°C.
Gibbs Free Energy Calculation of Al-Cu Alloy Using Thermo-Calc Software for Microstructure Simulation
Authors: Wang Guo Tian , Zhao Chen Guang , Qi Xiao Jie , Tang Jin Jun , Liang Cui
Published: February 2012

The conformation of volume free energy is very important for microstructure simulation with phase-field method. However, the conformation of volume free energy is still correspondingly simple and ideal at present. In this paper, a new conformation method of free energy is mentioned. Free energy of each phase at appointed states is calculated by Thermo-Calc software. Free energy of each phase is fitted by multiple-point function according to sub- regular solution model. It is obtained that the free energy data and phase graph data of α phase, θ phase and L phase in the extension, temperature (791-841) K and component (0-35)Cu(at.%) with Al-Cu eutectic alloy.
Design and Analysis on the Increasing Friction Mechanism of the Convex-Hull-Typed Bionic Driving Drum
Authors: Sun Hui , Xiao Lin Jing , Su Chun Jian
Published: February 2012

The micro textures in the foot surface of the animals such as locust and tree frog have been analyzed with the bionic tribology and several kinds of the convex-hull-typed bionic driving drums are designed. According to the friction mechanism of the rubber material and the simulation results by the software ANSYS, the increasing friction mechanism of the convex-hull-typed bionic driving drum is analyzed. When the convex-hull-typed bionic driving drum contacts with the rubber belt, besides the sliding friction force, the friction force between them also includes the additional resistance resulted from the inlaying ‘meshing effect’ between the convex hulls and the rubber belt. The convex hulls on the surface diminish the contact area, so does the sliding friction force. Therefore, only if the additional resistance greater than the decrease of the sliding friction force, the convex-hull-typed bionic surface can increase the friction force. The dynamic tension measuring system of the belt conveyor is designed and manufactured to measure the friction coefficient between the belt and the driving drum. The experiment results prove that the convex-hull-typed bionic driving drums that meet the certain conditions have the increasing friction effect. The research achievement can be used in many situations which need increase the friction force.
Design and Fabrication on the Electroplating Polishing Pad with Phyllotactic Pattern
Authors: Lu Yu Shan , Kou Zhi Hui , Wang Jun , Zhao Cheng Yi
Published: February 2012

The surface texture of polishing pad is a key factor which determines the performance of polishing pad, and by altering the geometrical pattern of polishing pad surface, the surface texture of polished workpiece can be improved. In this paper, based on phyllotaxis theory in biology, the polishing pad with phyllotactic pattern has been designed and the effects of phyllotactic parameters on the surface texture of polishing pad have been discussed. Lastly, the polishing pads with phyllotactic pattern have been made with lithography and composite plating technology, and the influence of correlative plating parameters on plated coating have been investigated. The results indicated that the abrasive grain block density increase with the increasing of the diameter D of abrasive grain block and the decreasing of phyllotactic coefficient k, and the quality of electroplating is optimal when current density is 1A/dm2 and temperature is 30°C.
Lattice Boltzmann Simulation on Solid Oxide Fuel Cell Performance
Authors: Feng Wang Jun , Wu Gong Wei , Xu You Sheng
Published: February 2012

Based on models of a porous electrode, a more accurate lattice Boltzmann model for simulating the performance of a solid oxide fuel cell (SOFC) is proposed. Results show good agreement between simulated and measured data. The accuracy of concentration over potential prediction is crucial for low reactant concentrations. The addition of a small amount of air to the fuel yields fully stable performance without measurable carbon deposits detected on the catalyst layer or the fuel cell. Cell performance increases with the temperature. As a first test of the model, a benchmark problem regarding the performance of an internal reforming solid oxide fuel cell (IR-SOFC) is investigated. When the catalyst activity decreases, the rate of methane conversion decreases near the reactor
Marketing Policy Based Service Composition Model for Supplier Selection in Network Manufacturing
Authors: Zhou Tao
Published: February 2012

Supplier selection, which is the first step of the network manufacturing, is evaluated as a critical factor for the manufacturing enterprise desiring to be successful in nowadays competition conditions. In network manufacturing, we first construct manufacturing process, and then select suitable suppliers. No matter suppliers provide components or services, we can unified consider they are all some types of manufacturing services. It’s very familiar with service composition, so we introduce marketing policy based service composition model to resolve supplier selection problem in network manufacturing. With the scope of this paper, we categorize manufacturing supplier selection constraints into three groups based on QoS, and propose a simple business constraint service composition model of marketing policy for supplier selection, which means that purchasers can get better manufacturing services from this model by choosing most suitable suppliers.
Implementation and Development of a Collaborative Design Platform for Heavy Trucks
Authors: Sun Jia Kun , Yang Chao Ying , Yin Fu Peng
Published: February 2012

In the domain of computer supporting collaborative work (CSCW), various software packages have been developed for the product development. To solve the problem of the low efficiency of product development in heavy truck, the requirements of heavy truck development in collaborative design are analyzed, and then the system architecture and integration structure is proposed, on the basis, a collaborative design platform is developed and implemented in a heavy truck enterprise. The collaboration between design department and sales department, suppliers, after-service department based on the platform is implemented, which lays a solid basis for the improvement of product development speed and after-service level.
Economic Evaluation of Remanufacturing End-of-Life Electromechanical Products
Authors: Xu Zhao Long , Xiao Su Mei , Shi Yu Qiang
Published: February 2012

With the shortening of product life cycle, and the constant increasing of End-of-life Electromechanical Products, the processing of waste products appears especially important and urgent. This paper, based on an existing recycle model, has established an economic evaluation model of end-of-life electromechanical products. Based on the collection of a large amount of data and tests, the research and evaluation of the engine has proved it is suitability for remanufacturing.
Reliability Analysis Based on Long Flatcars
Authors: Cheng Chang
Published: February 2012

The paper introduces the significance of applying reliability technology to railway products and the basic methods and steps to apply reliability technology to the design of INTRCO long flatcars of wagon. These methods and steps include analyzing first the System Safety Assurance of the wagon system applying in an operating environment, detecting the weak parts and offering improvement, building a reliability logical model and a mathematical model for the wagon system, predicting the reliability of the wagon system, analyzing and summing up the results, identifying the shortcomings and proposing suggestions for improvement.