bluuebunny/crossref_metadata_2025 huggingface dataset:
Performance of LiFePO4 Cathode Material Synthesized by a Low-Cost and Safe Method
Authors: Li Zhi Hua , Chen Shan , Xu Bin Bin
Published: June 2012

In order to decrease the synthesis costs and resolve safety care in synthesis process of LiFePO4, a novel synthesis approach was put forward. Instead of traditional reduction atmosphere Ar/H2(95%/5%), the reducing flow produced by the breakdown of sucrose independently is used as protective atmosphere. Then, carbon-coated LiFePO4 samples were synthesized by solid-state method using Li3PO4, FePO4, Fe powder as the raw materials, and sucrose as the carbon source. The results show that the LiFePO4/C sample in this flow exhibits excellent performance after 7 hours’ sintering at 650°C. It had an initial capacity of 141.8mAh/g at 16mA/g discharge current and the coulomb efficiency reached 98.95%. Furthermore, the specific capacity was almost not fade after 20 cycles. Our experiment results prove that our approach can replace the traditional atmosphere Ar/H2, and it helps reducing the energy consumption and cost, and is expected to be commercially feasible in the future.
Life Prediction of the Oil-Free Piston Rings in the Air-Powered Swashplate Engine
Authors: Lian Yong Qing , Xu Qin Chao , Ren De Kui
Published: June 2012

The air-powered swashplate engine is different from the oil-free compressor in working principle and mechanism. In order to predict the life of the oil-free piston rings of the engine , a new method is put forward, and is used to the life prediction of the rings. The results shows that the oil-free piston rings which is designed for the air-powered swashplate engine are feasible .
An Efficient Computational Procedure of Fatigue Crack Growth under Variable Amplitude Loading via XFEM
Authors: Liu Jian Tao , Du Tian
Published: June 2012

Modeling of fatigue crack growth (FCG) under variable amplitude (VA) loading has been a topic of intensive research for decades. This paper proposed an efficient numerical simulation procedure of the FCG process under VA loading via extended finite element method (XFEM). The procedure can describe the integrative effect of several factors (specimen thickness, stress ratio, Poisson’s ratio and so on) simultaneously with a general model. In order to improve the computation efficiency, the whole continua domain is divided into two parts by the level set functions and the global stiffness matrix is divided into four parts accordingly. Then, the inverse operation of global stiffness matrix can be calculated rapidly with the LDU decomposition and the equilibrium equation can be solved effectively. Several sets of fatigue test data in 2024-T351 and 7075-T6 aluminum alloys are used to verify the procedure, the predictions are in good agreement with the test data.
Design and Implementation of Service Robot Lightweight Dual-Arm Based on CAN Bus
Authors: Li Xian Hua , Guo Shuai
Published: June 2012

Because high positioning accuracy of industrial robots requires high stiffness at the price of high robot mass and energy consumption relative to the payload of the robot, this paper describes a kind of service robot dual-arm constructed by lightweight reconfigurable modules. After analyzing the composition characteristics of service robot dual-arm, the type selection of robot arm modules is accomplished, and the hardware platform of robot dual-arm composed by modular joint is builded. According to the modularization characteristics of arm joints, the distributed control system is designed.
Research on Expert System for Ball Mill Type Selection Based on Knowledge
Authors: Xia Jian Sheng
Published: June 2012

The ball mill grinding process is an important grinding process, the type selection and design of the grinding system is a complex process, so the previous design needs to rely on the experience of experts. It uses the expert system principles and case-based reasoning technology in the grinding system selection, to improve the design efficiency.
Research on Mechanical System Design Based on Service-Oriented Architecture
Authors: Li Nai Gen , Zhang Nian Jun , Zhu Meng Guo
Published: June 2012

The mechanical system design method based on the Service Oriented Architecture was proposed through the service-oriented architecture technology and mechanical system design theory analysis .The machine arm system design finite element analysis process was presented. Based on the TomCat platform design, Service oriented architecture design of the robot arm system design based on finite element analysis process were established. This design method was verified technically.
Robustness Analysis & Design for the Driver of the DC Motor
Authors: Liu Guo Liang , Li Jian Feng
Published: June 2012

Abstract.For the control unit in a control system, under a certain type of perturbations, including the disturbance of its own model, the property that system maintains certain performance parameter to designed index is defined as robustness. A designed system is robust when its response does not dissatisfy design requirements under model parameter variations.In practical application, it is not unusual that some parameters of system model are not precisely known. Such parameter is defined as uncertain parameter, because its value varies within a given range, even though its nominal value and variation range are known.In this article, in order to design a robust control system, MATLAB is utilized to perform robustness analysis by establishing an uncertainty model of DC motor.
Research and Design on Long-Distance Large-Capacity and High-Speed Belt Conveyor
Authors: Liu Jing Ping , Wang Bao Hua , Lu Shan
Published: June 2012

This paper discusses aspects of long distance, large capacity, and high speed belt conveyor design. The study is focused mainly on the whole arrangement and main components configuration of Belt Conveyor, including driving device, conveyor belt, drum and rollers etc. With increasing demand for the long distance, large capacity belt conveyors, its designing and manufacturing level will be improved.
Adaptive Particle Swarm Optimization with Dynamic Population and its Application to Constrained Engineering Design Optimization
Authors: Liu Yi , Mu Cai Hong , Kou Wei Dong , Liu Jing
Published: June 2012

This paper presents a variant of the particle swarm optimization (PSO) that we call the adaptive particle swarm optimization with dynamic population (DP-APSO), which adopts a novel dynamic population (DP) strategy whereby the population size of swarm can vary with the evolutionary process. The DP strategy enables the population size to increase when the swarm converges and decrease when the swarm disperses. Experiments were conducted on two well-studied constrained engineering design optimization problems. The results demonstrate better performance of the DP-APSO in solving these engineering design optimization problems when compared with two other evolutionary computation algorithms.
About ARM9 Car-Inserted GPRS Terminal Design
Authors: Li Sha , Wang Sheng
Published: June 2012

This thesis mainly introduces the basic design process of ARM9 car-inserted GPRS terminal , which applied the Mini2440 inserted hardware platform and developed the new car-inserted GPRS terminal, based on ARM9 terminal. Its processor is ATRM9200T which has the function of ARM9 memory used in industry. It inputs the Linux operation system and uses GPRS communication network for wireless communication . This terminal enjoys high reliability and stability. The application procedure has great functionality and it is a cross-subject program with great prospect.
Bayesian Reliability-Based Optimization Design of Torsion Bar
Authors: He Xiang Dong , Huang Jun Yan , Liu Shu Tian
Published: June 2012

Based on bayesian statistics theory and reliability-based optimization design, the research presents a new reliability-based optimization design approach that solves the form of finite test samples. In the article, the bayesian reliability-based optimization mathematical model is established and the bayesian reliability-based optimization approach of torsion bar is proposed. The method adopts a bayesian inference technique to estimate reliability, gives definition of bayesian reliability. The results illustrates the method presented is an efficient and practical reliability-based optimization approach of torsion bar.
Optimization of the Scavenging System Based on Specific Time-Area Value of a Compact Two-Stroke Gasoline Engine
Authors: Xing Shou Chen , Guo Chen Hai , Xie Pu Kang , Dong Fei
Published: June 2012

The specific time-area values describe the circulating ability of two-stroke engine ports during the gas exchange process, so they are the main parameters to affect the engine performances [1]. This paper establishes mathematical models of port parameters for symmetrically timing ports of two-stroke gasoline engine with carburetor and crankcase loop scavenging, the emphasis of analysis is specific time-area values of the ports. The mathematical models of specific time-area values which introduced in this paper give the initiative for further research on the numerical simulation and the optimal design of two-stroke engine.
RMS-Oriented Method of LRU Design
Authors: Zhou Dong , Jia Xu , Li Yong Xiang
Published: June 2012

Line Replaceable Unit (LRU) is an important unit of the equipments and products. Improving LRU planning can improve the characteristics of RMS of the products, especially on the maintainability and reducing life cycle service cost (LCSC). This paper studies the relationship between LRU planning and Product design, and builds the frame of LRU planning combined with RMS design rules and requirements. Qualitative analysis and quantitative analysis are adopted to analyze and evaluate the LRU planning synthetically. Analysis and evaluation process include three steps: qualitative analysis, Mean Time To Repair (MTTR) quantitative analysis and LCSC quantitative analysis. The mothed in this paper can improve the status quo of traditional product design out of touch with the RMS design.
Research on Morphological Language Applied in Visual Design
Authors: Yan Ru Shan
Published: June 2012

Since time immemorial, “language” has always been an important tool for conveying messages. Explorations on morphological language applied in visual design are namely researches on visual thinking and representation. Basic shapes of things can be transformed into component elements in visual design. By properly making use of component orders, the shapes will then effectively deliver information. In this paper, we are mainly to analyze how to select and illustrate shapes, how to perform formalized visual representation, how to figure out visual elements from natural shapes, man-made shapes and pure shapes, as well as the corresponding morphological rules used in visual design.
A Strips Dispersion Measuring Device Developed
Authors: Liu Fen
Published: June 2012

It describes the working principle of a strips dispersion measuring device in this article, on the basis of the application field, with the effective integration of image acquisition and data processing systems, timely and accurately measuring strips area, in order to provide a reliable basis for tobacco grading and packaging.
Adaptive Temperature Control Systems Design
Authors: Kong Yi Nan
Published: June 2012

This paper presents an advanced low-cost temperature control system. The system takes the highest performance-cost ratio as its aim. It uses the low-cost 8-bit MCS-51 MCU and integrated temperature sensor to achieve the on-site control. A lower cost remote host computer can be used in this system. In the case of a relatively larger application, it can be expanded to a control system of master-slave distribution and utilize the computing and storage resources of the microcontroller. It realizes a wider range of temperature adjustment, and then put the state of the system into a database of the microcontroller to be ascertained later.
Reliability Analysis of a Mechanism with Grey System Parameters
Authors: Zhang Jian Guo , Chen Jian Jun , Du Jing Li
Published: June 2012

By using gray theory model, the problem with less data and poor information is easy to be solved. Thus, the grey theory and the reliability assessment method were connected to analyze the mechanism motion. At first, the concept and model of mechanism’s grey movement reliability were presented. And then, from the limit state equations of a mechanism’s moving function and kinematic accuracy, the gray reliability calculation formulas were deduced. Finally, combined with two examples the method was applied to the actual reliability analysis. The results show that the method is feasible and efficient, so it is practical to apply the grey reliability model in mechanism reliability analysis.
Preparation of the Multilayer Colorized Electromagnetic Shielding Fabric
Authors: Bin Sun , Wang Zhi Xin , Lu Jin Bin
Published: June 2012

In this paper, the electromagnetic shielding fabric with Ni-Cu-Ni three layers and colorized appearance was prepared by the electroless plating and colorized electroplating. The current density was distributed unevenly in the course of colorized electroplating, which resulted in the nonuniform color of the electroplated fabric. In this paper, this problem was solved by improving the electroplating fixture. The adhesion strength and the conductivity of the coating were measured respectively. The results showed that the Ni-Cu- Ni multilayered coating possessed stronger adhesion strength to the fabric substrate than single layered coating, and the conductivity of coating was better than that of pure metal.
Research on Structural Strength of Catamaran Superstructure Constructed with Aluminum Alloy
Authors: Zheng Yuan Zhou , Huang Yan Ling , Peng Kai Zhou
Published: June 2012

The design of Superstructure constructed with aluminum alloy do not have to follow the traditional standard design method. It can be designed by applying strength theory and ANSYS program or MSC Patran / Nastran program, which can ensure the strength requirements with the selected aluminum alloy components and make the weight of the ship lightest. In this paper, the 42.4m catamaran sightseeing boat is used as an example. The structural strength of the superstructure constructed with aluminum alloy is calculated by MSC Patran / Nastran program. The distribution of the superstructure stress is obtained, which proved the size of the selected components of the superstructure can meet the requirements of the local strength and can be the reference of selecting the structure size. As the other conditions are unchanged, the the local thickness of the junction of the front wall and the side wall of the compass deck is changed. the relationship between plate thickness and stress is obtained. It is found that as The plate thickness is thicker, the stress there decreases; and as the thickness is smaller, it is obvious to reduce stress as the plate thickness Increase. when the thickness increases to a certain extent, the effect of the plate stress decreases is not obvious.
A Study on Optimization Design and Performance Test of an Aerostatic Bearing
Authors: Shie Jen Sheng , Shih Ming Chang
Published: June 2012

This paper discusses about how to optimize design of an aerostatic bearing. In order to achieve the objective, there are four necessary qualifications: high load capacity, high stiffness, low flow rate and uniformly pressure distribution, those make an aerostatic bearing optimized. The finite difference method is employed to obtain the numerical solution of the pressure distribution between the surface of aerostatic bearing and worktable. The performance is determined by the pressure distribution of aerostatic bearing. Furthermore, this study proposed an integrated optimal approach that is HTGA/Gray. Comparing with many kinds of optimal theories finds out the most suitable parameters of an aerostatic bearing. Finally, the experimental results for the load capacities and flow rates clearly indicate that the proposed aerostatic bearing can enhance ability effectively.
Multi-Criterion Decision Making for Build Direction in Layered Manufacturing
Authors: Yue Rui , Peng An Hua
Published: June 2012

Abstract: Based on analyzing the influences of build direction on stair-stepping effect, supporting structure, efficiency, and deformation, etc., analytical hierarchical process (AHP) is introduced to make decision for build direction in layered manufacturing. The applications to optimizing the build direction of a computer mouse during prototyping show that the proposed method increases the rationality during decision making and improves quality and efficiency for the prototyping part.
The Manufacture of a Newfashioned Portable Pneumatic Cutting Sampling Machine
Authors: Wang Yan Kun
Published: June 2012

The design and adhibition of a new fashioned portable pneumatic cutting sampling machine used in the sap of the mine which use the compressed air as the source of power is introduced in this article and the problem of inefficient and large labour intensity which exist for a long time in the cutting sampling in the sap of the mine is solved in this article.
Devising Adaptive Environment Agent for Reliability Analysis of Materiel System
Authors: Shen Ying , Cao Jun Hai , Wu Wei , Ni Ming Fang
Published: June 2012

After building the system structure model of materiel system reliability simulation based on Adaptive Agent, it emphasizes devising thinking on Adaptive Agent, which apperceives or responds change of system and environment and adjusts automatically failure generating algorithm, and provides devising thinking and reference on other Adaptive Agent in the frame, not only to simulate component action in the complex environment , then to mission environment-oriented reliability analysis for materiel system, establishes a better operational and current reference technology model.
Engineering Design Method and Fabrication of the Fully Featured Accelerating Structure for the CLIC Study
Authors: Gudkov Dmitry , Solodko Anastasiya , Samoshkin Alexandre , Riddone Germana
Published: June 2012

The very high accelerating gradient of the Compact LInear Collider (CLIC) design requires radio frequency (RF) structures, which operate in a performance range well beyond that found in any existing accelerator. Specifically, power generating structures (PETS), waveguide components and accelerating structures (AS) are being developed, and they have to work with an unprecedented combination of frequency (12 GHz), peak power (100 MW), pulse length (about 300 ns) and accelerating gradient (100 MV/m). Each accelerating structure contains about 30 copper disks, which form the accelerating cavity. The requirements of different technical systems, such as vacuum, cooling and alignment, have to be considered during the engineering design of a fully featured AS. This paper describes the engineering design method and fabrication of the fully featured AS for the CLIC study at CERN.
Design of Reverse System Besed on Bluetooth Technology
Authors: Du Xin Yu , Sun Xin Guo
Published: June 2012

Reverse processing parts has many ways, the use of edge detector and CNC machine tools on the part of data measurement, using Bluetooth technology to transfer data, using curve fitting method for data processing is a very practical method of reverse.
Rush Repair Method and Suggestion of Long-Span Arch Bridge in Wartime
Authors: He Li , Qian Yong Jiu
Published: June 2012

The enemies pay much attention to the opponent significant bridge in modern war and future war. A number of long-span arch bridges are damaged by blast loading. According to the damage condition and damage assessment of long-span arch bridge subjected to blast loading, a variety of methods suitable for rush repair in wartime are summarized, the rationalization proposals of enhancing anti-blast ability of long-span arch bridge are proposed. The research work is meaningful for the rush repair of long-span arch bridge.
The Optimized Method Research of Spare Parts Based on the Supportability Possibility
Authors: Peng Li Ying , Xiong Qing Lin , Zhu Zheng You
Published: June 2012

The method of spare parts support ability possibility is put forward on the operational readiness, and the relation model is built on spare parts and each spare part possibility, the optimized method and arithmetic is established on the lower total expenses under the certain war preparedness request, it is guidance to store the spare parts on the surface-to-air.
A Comparative Study on Statistics Based on Binary Data and Fuzzy Data in Office Chair Design
Authors: Zhao Wei Guo , Yang Chun , Wang Li
Published: June 2012

Consumers’ product style perceptions and preference are vague and uncertain. In order to identify consumers’ needs more accurately, this paper established a questionnaire based on fuzzy data, carried out a spot check to consumers’ style preference and perceptions of twelve office chairs with typical form style, then conducted the mean, distances calculation and fuzzy clustering analysis by Excel, SPSS, and Matlab. Comparing with statistics results of traditional questionnaire data, this paper points out that fuzzy data statistics are suitable for the mean calculation of small sample and the clustering algorithm of few preference variables.
Analysis and Optimal Design on Electrical Dust Precipitator Steel Structures
Authors: Gao Yang , Huang Lu Yu , Zhang He
Published: June 2012

By using the finite element analysis software ANSYS, this article presented the structure stress and displacement of a type of electrical dust precipitator on a variety of loads effect, after the main steel structures of the model was built according to the frontal solution method, optimization design of model's main steel structures had been done. The modeling and the computational Method has been proved the reasonableness of precision, and can be further used for structure analysis and so it has reference value for optimization design of other electrical precipitator steel structures.
Stress Analysis and Structure Optimization for the Opening Flat Cover of Pressure Vessels
Authors: Xiao Jun Jian
Published: June 2012

According to the results of finite element analysis (FEA), when the diameter of opening of the flat cover is no more than 0.5D (d≤0.5D), there is obvious stress concentration at the edge of opening, but only existed within the region of 2d. Increasing the thickness of flat covers could not relieve the stress concentration at the edge of opening. It is recommended that reinforcing element being installed within the region of 2d should be used. When the diameter of openings is larger than 0.5D (d>0.5D), conical or round angle transitions could be employed at connecting location, with which the edge stress decreased remarkably. However, the primary stress plus the secondary stress would be valued by 3[σ].
Influence of SiCp Surface Treatment on the SiCp/Al-30Si Microstructure and Performance
Authors: Ni Zeng Lei , Wang Ai Qin , Xie Jing Pei , Fang Ming , Zhang Li Jun
Published: June 2012

α-SiC particles have been processed with surface treatment of high-temperature calcination and water washing technology. SiCp/Al-30Si composite has been prepared in the vacuum hot extrusion process. The powder morphology and specimens microstructure have been observed using scanning electron microscopy, the phase of SiC has been analyzed using the X-ray diffraction. Meanwhile, the tensile strength and thermal expansion coefficient of the composite have been tested. The effects of the morphology of the SiC particles, tensile strength and thermal expansion coefficient have been studied on composite microstructure. The consequences show that, after the surface treatment SiCp/Al-30Si composite，the interfaces combined with matrix are in a better condition and less holes, the tensile strength of composite materials has been improved significantly, the coefficient of thermal expansion becomes lower than before.
The Reform Design of Product Based on the Principle of Economy
Authors: Han Wei Guo
Published: June 2012

Based on the principle of the product, the article explores the principle of economy in the process of the reform design of product, furthers the relationship between the different stages and the participants in the process of the reform design. A case of coffee machine design will be included to illustrate that as well.
Design of Suspension Control System for Bearingless Motor
Authors: Duan Chun Xia , Han Ying , Zhao Yan Hua
Published: June 2012

Bearingless motor, which combines characteristics of alternating current motor and magnetic bearing, can operate without magnetism suspension bearing by making use of magnetism suspension bearing winding that produce magnetism suspending power in the motor stator. Through torque winding and suspending power winding decoupling control, it can make the motor rotor to produce torque and suspension simultaneously. The bearingless motor features high speed and little friction etc. It is one of current hot research areas. The design of bearingless motor suspension control system is the key of this research. The basic principle of the bearingless motor suspension control is introduced and the design of the suspension control system based on the directional magnetic field of torque winding rotor is provided in the paper.
Research on Domain-Driven Modular Design of the Seeker in 3D Environment
Authors: Li Shao Xing , Wu Bao Zhong , Yan Yue Hui , Li Guo Xi , Gong Jing Zhong , Zhang Meng
Published: June 2012

In order to improve the design efficiency and the derivation speed of the seeker, a method of domain-driven modular design of the seeker is put forward. By introducing the thought of Model Based Design (MBD), the 3D visualization of the seeker’s non-geometric manufacturing information is achieved through integrating the information with the skeleton model, namely integrated skeleton model. The process of the configuration design based on the integrated skeleton model is offered to advance the development of the design concepts in the domain of the seeker. Finally, a design software prototype achieving the proposed method is developed and its validity and practicability is demonstrated by the instance design of the infrared seeker.
Research on the Automatic Walking-Type Launching System Applied in Jiubao Bridge Construction
Authors: Zhang Hong , Zhang Yong Tao , Zhou Ren Zhong
Published: June 2012

In Long-span bridge construction by incremental launching method, due to its quiet heavy launching weight, long cantilever and complex structural stress. The dragging-type launching equipment commonly used at present no longer applies. Based on Jiubao bridge project, a new launching system of Automatic Walking-type Launching System (AWLS) was developed. This AWLS is a self-balancing launching system that integrates with functions of lifting, pushing and rectifying. It features highly automation, safety and reliability in operation. By using this system, Jiubao Bridge was successfully erected by incremental launching method for the first time as a three-span beam-arch composite bridge at home and abroad.
Deposition & Characterization of TiAlON & TiMoAlON Solar Absorber Coatings for High Temperature Photothermal Applications Prepared by PEM Controlled Dual-Gas Reactive Magnetron Sputtering
Authors: Geng Hai Bin , Wu Tao , Ma Cheng Wei
Published: June 2012

A novel Plasma Emission Monitoring (PEM) controlled N2-O2 dual gas reactive dcMS method is proposed for deopsiting TiAlON and TiMoAlON solar absorber coatings. Working in a 'cheated' feedback mode, the PEM controller ensures smooth & precise control of O/N ratio in obtained oxy-nitrides without occuring of serious target poisoning. The coatings have three functional layers including the infrared reflector, the absorbing layer, and the antireflection layer. The absorbing layers of the two kinds of coatings are both designed to have a gradually change Al and/or O content. However, the TiAlON coatings have a single TiAlON absorber layer while the TiMoAlON have a tandem absorber composed of a Mo doped TiAlN layer and a Mo doped TiAlON layer. Single-crystal silicon chips and glass slides are used as substrates to deposit the coatings and to characterize the photothermal conversion properties and thermal stability of the coatings by using SEM, UV-visible-near infrared photospectrometer, and solar spectrum emissiometer. The experimtal results show that the tandem TiMoAlON coating exhibits superior theraml stability up to 550oC. After annealing in air at 500oC for 8hrs, it exhibits higher absorptance than as-deposited status. The annealed TiMoAlON coating has a broad absorbing peak covering 400-800nm, which is beneficial to collect the majority energy in solar radiation. Due to its higher absorptivity and lower normal emissivity than the TiAlON coatings, the TiMoAlON coating yields a high solar selectivity (α/ε≈19) at room temperature. However, at 500oC, its ε value increases from 0.05 to about 0.25 which might attribute to its excessive thicknesses of the sublayers. The above results demonstrate that the proposed method is a convenient way for preparing high performance oxy-nitride solar absorber coatings which are suitable for non-vacuum high temperature photothermal applications.
Surface Modification of Nano-TiO2 by Titanate Coupling Agent
Authors: Yu Shou Wu , Xiao Shu Juan , Sang Xiao Ming , Hou Gui Xiang
Published: June 2012

The surface of commercial TiO2 nanoparticles was modified by titanate coupling agent, JSC(isopropyl tricarboxytate titanate), FTIR spectrum confirmed that organic functional groups were successfully grafted onto the surface of TiO2 nanoparticles. The SEM micrographs indicated that the aggregation of modified TiO2 was reduced and most of the particles were approximately 20 nm.
The Rehealing Ability of Oxide Scales on K52 Nanocrystalline Coating after Pitting Corrosion
Authors: Zheng Zheng Hua , Lv Yong Yao , Bai Hui Ping
Published: June 2012

The rehealing ability of the oxide scales on sputter-deposited Ni-based K52 nanocrystalline coatings after pitting corrosion had been studied by polarization curves in 3.5% NaCl solution. The results indicated that the oxide scales formed on the nano-coatings exhibited excellent rehealing ability after pitting corrosion, and the rehealing oxide scales still had high corrosion resistance. The rehealing ability was declined with longer immersion time in the chloride solution. EDX analyses revealed that the oxide scales within the pits were composed of mixed-oxides. The mixed-oxides were made up of two layers: the external oxide layer was composed of Cr2O3 and TiO2 and the internal oxide layer was Al2O3.
Effect of Heat Treatment Temperature on Properties of SiO2-ZrO2-Al2O3-Cr2O3 Coatings on Stainless Steel Substrate
Authors: Jia Qing Mei , Tang Yong Hong , Meng Ke Nan
Published: June 2012

The SiO2-ZrO2-Al2O3-Cr2O3 film is coated on the surface of stainless steel using analytical reagent TEOS, ZrOCl2·8H2O, Al(NO3)3·9H2O and Cr(NO3)3·9H2O as precursor and basing on mole ratio to calculate through Sol-gel method. The phase transformation behavior，erosion resistance，thermal shock resistance and abrasion resistance of ceramic coating by different heat treatment are studied. The results show that: 1)The SiO2-ZrO2-Al2O3-Cr2O3 gel coatings has non-crystalline structure after the treatment at 700°C and 800°C. New substance is not created below 700°C 2) The stainless steel substrate with ceramic coating has a higher erosion resistance at high temperature (700°Cand 800°C)than that without coating.3) Thermal shock resistance of the samples treated in 700°C is the best which has reached within 17-21cycles (900°C, air cooling). 4) The stainless steel substrate with ceramic coating has a higher abrasion resistance than that without coating. The samples treated at 700°Cand 800°C have the best abrasion resistance.
Study of Tribological Properties of Micro-Arc Oxidation Ceramic Coatings Prepared with Different Impulse Frequency on Aluminum Alloy
Authors: Zheng Yu Gang , Zhou Hui , Hu Han Jun , Zhang Kai Feng , Wang Zhi Hua , Zhang Yan Shuai
Published: June 2012

The ceramic coatings, on the substrate of LY12 Al alloy, were prepared by micro-arc oxidation (MAO) technique with different electrical source parameters. The microstructure and tribological properties of the resulting micro-arc oxidation ceramic coatings(MAOC) were tested and analyzed by Nano-scratch tester, Micro-hardness tester and ball-on-disk friction tester etc. The results indicate that the thickness, roughness, micropore sizes and wear-resistance of MAOC increase with impulse frequency decreasing, however, the porosity is correspondingly reduced.
Study on the Signal Processing Methods of the Eddy Current Testing on the Steel Ball Surface Defects
Authors: Zhang Hua Yu , Xie Feng Qin , Li Qiang
Published: June 2012

In the detection of steel ball surface defects, the non-destructive eddy current testing has the advantage of reliability, high efficiency, non-contact and easy to automate, etc. Base on the establishment of the mathematical model of the ball surface unfolding, Correct processing of eddy current sensor output signal is the first conditions of accuracy. In the paper, base on the propose of unfolding mechanism of the ball's surface, with smooth, phase-sensitive detection, filtering and other methods to process the detected signal, so interference signals can be suppressed and to improve the signal to noise ratio; Then the signal can be further analyzed in time domain or frequency domain, the signal amplitude, frequency, phase and other characteristic quantities can be extracted, and the characteristic quantity of defect signal can be Calculated, So the surface quality of steel balls can be determined.
Effect of Braided Structure on Mechanical Properties of Cf/SiC Composites
Authors: Zhang De Ke , Cao Ying Bin , Liu Rong Jun , Jiao Ya Nan
Published: June 2012

Using polycarbosilane(PCS) as precursor materials, 2.5D、3D3d、3D4d、3D5d braided structure Cf/SiC composites were prepared by Precursor Infiltration and Pyrolysis (PIP). The result showed that different braided structure Cf/SiC composites had dissimilar change tendency of density and porosity. The braided structure and pore position influenced mechanical properties of Cf/SiC composites obviously. 2.5D Cf/SiC composites had the lowest mechanical properties compared others braided structure via PIP process, 3D5d Cf/SiC composites had the highest mechanical properties for the bending strength reached 334MPa, modulus 99.5GPa. Furthermore, the microstructure and properties of different braided structure Cf/SiC composites has been investigated by means of SEM.
Process-Parameter Optimization for Fused Deposition Modeling Based on Taguchi Method
Authors: Zhang Jin Wen , Peng An Hua
Published: June 2012

Abstract: Aiming at such performance indexes in fused deposition modeling (FDM) as dimensional error (DE) and warpage deformation (WD), and selecting four process parameters, wire-width compensation (A), extrusion velocity (B), filling velocity (C), and layer thickness (D), as controlling factors, this paper optimized the four process parameters by means of Taguchi method combined with fuzzy comprehensive evaluation. The optimization results show that the parameter with the most significant influence on the performance indexes is A, followed by B, D, and C, and that the optimum combination of the process parameters is A1B1C2D3.
Effect of Nonlinear Kinematic Hardening Model on Draw-Bend Springback Behavior of Dual Phase Steel
Authors: Lu Chao , Kang Yong Lin , Zhu Guo Ming
Published: June 2012

The aim of this study is to evaluate the effects of two nonlinear kinematic hardening models on springback prediction of dual phase steel. Young’s modulus degradation with plastic strain was also considered. Material parameters of both hardening models were identified by fitting the experimental tension-compression-tension stress-strain curves using optimization software LS-OPT. The results showed that the nonlinear kinematic hardening models gave good prediction compared with measured data. And a 2-D draw-bend springback benchmark was applied to assess the material models with identified parameters. The accuracy of springback simulation improved when both kinematic hardening and Young’s modulus degradation were considered. Yoshida model gave the best overall springback prediction in the draw-bend springback of dual phase steel.
Study on the Critical Plastic State of the Simply Supported Beam under Non-Linear Hardening Model
Authors: Zhang Guo Zhi , Fu Jun Jing
Published: June 2012

The plastic state of simply supported beam loaded by the uniformly distributed load was studied. When its material models are bilinear hardening material model and exponential hardening material model, its maximum limit model was established. Moreover, the critical curve model of the theoretical model of plastic zone was established. Furthermore, through comparing the finite element analysis results with the theoretical analysis results, the theoretical models established in the paper was verified.
Comparison and Verification Analysis on the Fitting Curves of Several Different Creep Models
Authors: Wang Yong Yan , Xu Fei , Wang Yan Chun , Shi Jia Bin , Lu Hong Li
Published: June 2012

Soft rock has a strong rheology behavior and displays different creep process under the different stresses. According the experimental data from the sandstone creep test, firstly the paper fitted and compared several different creep models, got the optimized sandstone creep model under the condition of low stresses, finally the paper determined its model parameters under the condition of different pH and differential stresses with the program of MATLAB who have certain reference value.
Numerical Simulation of LPDC Process for Thin-Walled Aluminum Alloy
Authors: Zhang Li Qiang , Wang Rong Ji
Published: June 2012

In general, the thin-walled casting with the thickness less than 2mm is not easy to be prepared using low-pressure die casting (LPDC) technology because of its poor filling-ability. In this paper, the LPDC process of A356 thin-walled aluminum alloy was simulated based on the selection of appropriate boundary conditions in order to save the cost. The simulation results compared with experimental results indicate the numerical simulation technology is an effective tool for reducing the manufacturing cost and improving the casting quality.
Kinematics Simulation of Parallel Mechanism Based on ADAMS
Authors: Du Xin Yu , Liu Hong Wei
Published: June 2012

In this paper,a kind of 3-UPU spatial parallel mechanism is introduced. Through deep analysis of the degree-of-freedom (DoF) for the platform using screw theory， the position and orientation of the moving platform is discussed. At last, the 3D virtual prototype modeling of this 3-UPU parallel mechanism based on software ADAMS is developed; the kinematics simulation and analysis are also carried out accordingly. From the simulation results, we can see that the proposed calculation of the DoFs and kinematics analysis is correct.
Mathematical Model of Coal Mine Gas and Coal Dust Control
Authors: Bian Wen Li , Cai Jian Ping
Published: June 2012

The best is to read these instructions and follow the outline of this text. The coal mine production safety is one of China's current problems to be solved, do a good job monitoring and control of underground gas and coal dust is a key link to achieve safety in production. In this paper, the programming model is used to find the best ventilation rate and then control the mine gas and coal dust concentration effectively. Based on “Coal Mine Safety Regulations” and characteristics of coal dust and gas explosion with the relationship of mutual influence, we come to the possibility of coal mine explosion hazard. Finally, with the linear regression knowledge, we figure out the relationship between the wind speed and concentration of gas and coal dust, then we express the gas density and dust concentration in different parts of the mine by air volume function, through the limit of safe production on the gas concentration and coal dust concentration, to find constraints on air volume, construct a linear programming model, finally get optimum ventilation rate and the optimal control method.
Numerical Simulation of Effect of X-Shape Submerged Nozzle on Flow of Molten Steel in Mold
Authors: Cui Xiao Chao , Jin Yan Juan , Chen Yan Xia
Published: June 2012

The numeric simulation of effect of X-shape submerged nozzle on flow of molten steel in a mold for 160mm×160mm concasting billet has been carried out by viscous fluid mechanics theory and CFD software Fluent. It was verified that during pouring with X-shape submerged nozzle, the vortex molten steel entering into mold by guide of vortex guidance channel which was formed with top and bottom surface of two semioval flow guidance plate and invert taper pipe to availably reduce impact depth, promote inclusion and gas bubble aggregating and floating off, and improve concasting efficiency.
Mechanical-Hydraulic Coupling Simulation for Hydraulic Excavator Working Mechanism
Authors: Zhong Xiang Qiang , Liang Li Dong
Published: June 2012

Hydraulic excavator is a typical and complicated engineering machine by combination of mechanical, control and hydraulic system. It is very important for coupling analysis by use of multiple simulation tools. Hydraulic excavator mechanical model was constructed based on Pro/E 4.0. Virtual prototype of hydraulic excavator was finished by use of ADAMS interface function and carried on a lot of kinematics and dynamics simulation analysis. Hydraulic cylinder circuit was derivated based on ADAMS/Hydraulics. Working principle of bucket arm hydraulic cylinder was analyzed. Mechanical and hydraulic simulation of bucket rod hydraulic cylinder was finished. Bucket rod hydraulic cylinder velocity was obtained. Simulation results show coupling simulations have certain theory value and practical significance. They can provide evidence for trial and optimization of physical prototype.
Numerical Simulation of Mold Filling and Solidification Process for Beam Blank Continuous Casting
Authors: Jin Yan Juan , Cui Xiao Chao , Zhang Zhu
Published: June 2012

Mold filling and solidification of molten steel for 750mm×450mm×300mm continuous casting mold of single SEN and double SEN are simulated by using CFD commercial code Flow-3d. The distributing diagrams of velocity field and temperature field and the location and shape diagrams of free-surface during mold filling process are obtained. Influences of single SEN model and double SEN model on velocity field and solidification are analyzed. It is found that double SEN model can lighten circumfluence intensity at the upper of mold, quicken solidification speed of steel liquid in the mold, which is favorable to improving the quality of billet and enhancing pull speed.
Application of Numerical Simulation in Quench Cracking Analysis of Vehicle Hub Axles
Authors: Xiong Yun Chang , Li Guo Hui
Published: June 2012

Abstract. It explained that the quenching crack distribution characteristics and formation mechanism of the vehicle hub axles. Quenching crack of the vehicle hub axles was always the longitudinal crack and distributes in the inner wall .The crack was thin and long with the phenomena of crack cross and associated. The results of finite element simulation show that the internal stress value of the vehicle hub axles is up to 300Kgf / mm2 with the common action of the structure stress and heat stress, it is far more than 40MnBH steel tensile limit. This is the main reason of quenching crack. So for controlling quenching crack, it is need control raw materials, optimization of the quenching process and quenching medium replacement and so on.
Surface Modification of PEOT/PBT Membrane with Silk Fibroin Anchoring and its Potential Application in Artificial Salivary Gland Construct
Authors: Zhu Jie , Li Ming Shi , Wang Li Qun , Zhu Xiao Lin
Published: June 2012

We reported the preparation of surface modified poly (ethylene oxide terephthalate) - poly (butylene terephthalate) membrane by the method of silk fibroin anchoring, namely SF/(PEOT/PBT). Its surface properties were characterized by contact angles and XPS and the biocompatibility of the composite membrane was further evaluated by human salivary epithelial cells (HSG cells) growth in vitro. Results revealed that SF/(PEOT/PBT) possessed the low water contact angle (48.0±3.0°) and immobilized a great amount of fibroin (fibroin surface coverage: 26.39 wt%), which attributed to the formation of polar groups such as hydrosulfide group, sulfonic group, carboxyl and carbonyl ones in the process of SO2 plasma treatment. HSG cells growth in vitro indicated that the silk fibroin anchoring could significantly enhance the biocompatibility of PEOT/PBT membrane, which suggested the potential application of fibroin anchoring PEOT/PBT for clinical HSG cells transplantation in the artificial salivary gland construct.
ANSYS Finite Element Analysis of a Large Space Steel Tower Frame Optimization Design Research
Authors: Zhao Fu Long
Published: June 2012

Based on the ANSYS finite element calculation and analysis results to do the optimization design research of a large space transformer substation steel tower．To meet the constraints in steel tower frame under the minimum steel weight as the goal, the original web members of tower system structure would be optimized which was in different web members system as contrast．The optimization of the determined web members system met the design requirements and were more reasonable in economy．
Micromagnetic Simulation of Asymmetrical CoFe Nanorings
Authors: Guo Zhen Gang , Pan Li Qing , Qiu Hong Mei , Zhao Xue Dan , Yang Li Hong
Published: June 2012

Domain wall motions and magnetization reversal processes in the nanoscale asymmetrical Co50Fe50 rings have been studied using micromagnetic simulations. The results reveal that the switching fields and the plateau width of vortex state can be tuned through changing the asymmetrical parameter of magnetic nanorings. The chirality of vortex states can be easily controlled by the orientation of the applied magnetic field.
Numerical Simulation of Linear Explosive Formed Penetrator by Endpoint Initiating Manner
Authors: Gou Rui Jun , Zhang Shu Hai , Fan Kai
Published: June 2012

The formation of linear explosion formed penetrator(LEFP) from linear shaped charge detonated from one end point was studied both theoretically and experimentally, and a numerical simulation was also carried out. By decomposing the detonation velocity vector into spherical and slide components, the theoretical model described the tip velocity change of LEFP. The numerical model illustrated the formation of LEFP and the tip velocity agreed with the theoretical model. The validation of the theoretical and numerical models was verified by experiment, in which steel targets were used to show the effect of LEFP. The results showed that average tip velocity was 2658.4 m/s at 100 mm to the charge mouth. The theoretical and numerical velocity values and distribution curve were very close to the experimental ones. This work may further develop the theory of LEFP and linear shaped charge.
Numerical and Experimental Pore Network Study on Slowly Isothermal Drying of Real Porous Media
Authors: Xu Ying Ying , Yuan Yue Ding , Yuan Yue Jin , Dang Xin An , Liu Xiang Dong
Published: June 2012

Taking the sand bed as the simulated object, a pore network model for drying of real porous media is developed by applying the invasion percolation theory and transport process principle, which fused the physical parameters of sand bed, such as porosity, pore mean diameter, pore size distribution, into the model parameters. The experiment and simulation results indicated that this model could explain the drying process of sand bed well. The throat size distribution has a great effect on the drying process.
Simulation Analysis of Cross Wedge Rolling Hollow Parts with Mandrel
Authors: Yang Cui Ping , Zhang Kang Sheng , Hu Zheng Huan
Published: June 2012

Cross wedge rolling hollow shafts with a mandrel has attracted much attention in the recent years because of the demand for light components. Finite element method was used to simulate the rolling process of hollow part and validated by experiment. By tracking strain change of the typical points and analyzing the strain contour maps of cross-section at four typical moments, the cause of cross section oval and shaft shoulder protuberance of part is expounded.