bluuebunny/crossref_metadata_2025 huggingface dataset:
Influence of Centrifugal Force on Characteristics of Turbine Shaft for Micro-Spindle for Micro-Cutting
Authors: Li Wei , Zhou Zhi Xiong , Huang Xiang Ming , Chen Chen , Meng Ling Yun
Published: September 2012

The centrifugal force has great influence on characteristics of the turbine shaft. The changes of stress, diameter and natural frequency of the turbine shaft for self-developed micro-spindle for micro-cutting following with the rotational speed were studied by finite element (FE) simulation, which showed that stress, diameter of the turbine shaft and frequency of torsional vibration in elastic shaft coupling integrated with the turbine shaft caused by the centrifugal force increases almost linearly with increase of rotational speed and the higher the speed, the larger the increase. The frequencies of other vibrational modes were influenced by centrifugal force. Materials with good properties can improve characteristics of turbine shaft caused by the centrifugal force well.
Effect of Machining of Small Tools by Means of Focused Ion Beam
Authors: Miura Kohichi , Satoh Syou , Yamada Takazo , Lee Hwa Soo
Published: September 2012

Micro holes which diameters are more than 0.1 mm are mechanically machined.　However since the ideal sharp cutting edges are difficult to be made in micro drills, fine geometrical shape of micro holes is difficult to be obtained. In this study, the influence of the geometrical shape of cutting edge is experimentally discussed. In order to carry out experimental evaluation, focused ion beam is used to make the geometrical shapes of micro drills.
Static Properties Research of Grinding Dynamometer for Wafer Grinder
Authors: Zhang Jun , Bai Yin , Qian Min
Published: September 2012

Grinding force is strongly related to grinding process, and the application of dynamometer for its measurement during machining is essential for investigating, monitoring and optimizing the grinding process. This paper presents an innovative dynamometer for triaxial grinding force measurement, specifically designed for an ultra-precision grinder. Two different kinds of spatial arrangements are discussed, including lozenge and square arrangement. The mathematical model is established and calculated. Furthermore, a series of static calibration tests have been conducted for the dynamometer, and static properties of the grinding area are also measured and analyzed. Eventually, on-line static tests of the dynamometer installed in silicon wafer grinder are performed. The results show that the grinding dynamometer has excellent properties, which reach the CIRP standards and meet the working requirements of the ultra-precision grinder.
Development of Ultra-Precision Grinder for 300mm Wafers
Authors: Zhu X.L. , Dong Z.G. , Kang Ren Ke , Guo D.M.
Published: September 2012

This study presents design of an ultra-precision wafer grinder which incorporates state-of-the-art automatic supervision and control system. The wafer grinder is characterized by wafer surface shape control, grinding forces and wafer thickness monitoring systems. The design provides a totally integrated solution to the ultra-precision grinder that is capable of grinding silicon wafers with surface roughness Ra<3 nm and total thickness variation<2µm/300mm.
Testing of a CNC Control Abrasive Belt Grinding Machine Based on Ultrasonic Thick Measure for Nuclear Zirconium Alloy
Authors: Huang Yun , Tang Cao Yong , Zhang Ming Xiang , Wang Ya Jie , Chen Yong Sheng
Published: September 2012

A highly efficient precision grinding method was proposed for the development of Zr-4 alloy used in nuclear industry. The key techniques to develop this new grinding machine are presented in detail, including soft grinding wheel head, ultrasonic thickness measurement system. An automatic polishing and grinding system was built, which is based on ultrasonic thickness measurement technology. According to a lot of grinding experiments, reasonable, accurate and efficient Zr-4 Alloy grinding parameters was determined. The experiments show that when the line speed of belt is about 18 m/s; the workpiece feed rate is 1000mm/min; grinding head cylinder pressure is 0.12Mpa, the silicon carbide abrasive belt of P80 particle size can get 0.02mm grinding amount and achieve excellent grinding effect.
Observation of Crack Propagation in PEEK Polymer Bearings under Water-Lubricated Conditions
Authors: Koike Hitonobu , Kida Katsuyuki , Honda Takashi , Mizobe Koshiro , Oyama Shunsuke , Rozwadowska Justyna , Kashima Yuji , Kanemasu Kenji
Published: September 2012

Radial ball bearings made of metal, ceramics and plastics are commonly used as important components in various types of industrial machinery. Due to the latest markets demands for elements capable of withstanding e.g. corrosive environment, metallic bearings are being gradually replaced by components produced from high performance engineering plastic polymers. In order to investigate the failure mechanism of polymer bearings and further improve their performance in practical applications in an underwater environment, in this research crack propagation in Poly-ether-ether-ketone (PEEK) was studied by rolling contact fatigue (RCF) testing under water. Crack propagation in the inner ring raceway surface and subsurface areas of PEEK bearings after testing was observed by a laser confocal microscope. Cracks and flaking failure were found on the bearing raceway surface. From the RCF tests results, it was found that the detected cracks could be divided into three groups: Main Surface Cracks, Semi-circular Cracks and Main Subsurface Cracks. It is concluded that flaking occurs on the inner ring raceway due to the fusion of semi-circular cracks and a main subsurface crack.
Observation of Fisheye Cracks around TiN and Al2O3 Inclusions in Repeatedly Quenched High Carbon Bearing Steel
Authors: Mizobe Koshiro , Honda Takashi , Koike Hitonobu , Santos Edson Costa , Kida Katsuyuki , Shibukawa Takuya
Published: September 2012

Martensitic high-carbon high-strength SAE 52100 bearing steel is one of the main alloys used for rolling contact applications where high wear resistance is required. Refining the prior austenite grain size through repeated heating is a process commonly used to enhance the material’s strength. In this work, the microstructure of repeatedly quenched Ti, N-rich ultra-clean SAE 52100 steel was investigated. The material was melted by an electric furnace and formed by continuous casting and forging, and the crack origin on the fracture surface was investigated. It was found repeated furnace quenching effectively refined the martenstic structure.
Effect of Thrust Load and Rotation Speed on Wear Loss in PPS Race - PTFE Retainer Hybrid Polymer Thrust Bearings under Dry Contact
Authors: Mizobe Koshiro , Honda Takashi , Koike Hitonobu , Santos Edson Costa , Kida Katsuyuki , Kashima Yuji
Published: September 2012

In order to establish an optimal material combination for the production of polymer thrust bearings, two types of components: retainer and PPS races - PPS retainer were tested by rolling contact fatigue (RCF). The wear properties of both bearing types were investigated and a relationship between thrust load, rotation speed and wear loss was established. It is concluded that by using a PTFE retainer, it is possible to improve the
Dynamics Modeling for Satellite Antenna Dish Stabilized Platform
Authors: Leghmizi Said , Liu Sheng , Fraga Ramzi , Boughelala Adel
Published: September 2012

The system for stabilizing platform of a ship carried antenna and its core component are discussed in this paper. Relevant mathematics model of these components are established. Thus, the dynamic model of the system is deduced including the effects of friction, inertia, and torque motors. Using Solid Works, we built the mechanical structure, including the servo machine of each part of the system. Then a simulation on Simulink of a simplified dynamics model of the stabilized platform was established. After that the classical PID controller has been designed and used for the stabilization system. From the simulation results, the behavior of this simplified model, and the advantages and drawbacks of this method are apparently displayed. 3D structure and simulation results are represented in this paper.
The Optimal Cutter Length Determining for Fixed 5-Axis Milling
Authors: Huang Wen Li , Inui Masatomo , Shi Zhi Hui
Published: September 2012

Fixed 5-axis milling machining has been the most preferred method in fabricating dies and molds with very deep shapes. In the process planning of such machining, determining of the cutter length is a time consuming task. In this paper, an algorithm for automatically determining the optimal cutter length for the fixed 5-axis milling operation is proposed. The optimal length can be derived by computing the distance between the cutter location points and an offset shape of the workpiece by the inverted zero-length cutter. These computations of the offset shape can be accelerated by using the depth buffer mechanism of GPU which is now installed on most PCs. An experimental system is implemented and some computational experiments are performed.
Statical Performance Analysis of the Reconfigurable Machine Tool Structure by Boundnary Element Method
Authors: Zhang Guang Peng , Sang Yao Hui , Guo Chun , Zhang Jing , He Yan
Published: September 2012

The overall performace of a reconfigurable machine tool strcture is affected by its reconfigurable schemes. It is significant to predict a machine tool structure performance for choosing the reconfigurable scheme of reconfigurable machine tools. The boundary element model of a thick plate bending is built basing on the Hu Hai-chang theroy which is pulled in the foundation of Reissner theory. Then the boundary integral equation and its fundamental solutions are given out and calculations of singular integration on boundary are presented. Finally the analysis method of a reconfigurable machine tool structure is established based on the thick plate bundary element modal. Case study shown that the proposed analysis method of the reconfigural machine tool structure is effective.
A New Simplification Method within Deviation Parameters and Allowed Angles
Authors: Meng Na , Chen Xin Li , Zhou Yi Qi , Dai Bao Qing
Published: September 2012

Research situation at home and abroad is described in detail about simplification methods of point cloud data. After analyzing the advantages and disadvantages of existing algorithms, an improved algorithm, a method combining with deviation parameters and allowed angles to simply mass cloud data, is proposed from several aspects of complexity, required time and memory space. The experiments show that the simplified point cloud have a great relationship with the selected tolerance value. And the point cloud after simplification has advantages of high reservation of curve and surface reconstruction perfectly, which is reserved enough data. The proposed simplification algorithm is an effective and practical method.
Sequencing Mixed-Model Assembly Lines to Minimize the Variation of Parts Consumption by Hybrid Genetic Algorithms
Authors: Wang Bing Gang
Published: September 2012

This paper is concerned about the sequencing problems in mixed-model assembly lines. The optimization objective is to minimizing the variation of parts consumption. The mathematical models are put forward. Since the problem is NP-hard, a hybrid genetic algorithm is newly-designed for solving the models. In this algorithm, the new method of forming the initial population is presented, the hybrid crossover and mutation operators are adopted, and moreover, the adaptive probability values for performing the crossover and mutation operations are used. The optimization performance is compared between the hybrid genetic algorithm and a genetic algorithm proposed in early published literature. The computational results show that satisfactory solutions can be obtained by the hybrid genetic algorithm and it performs better in terms of solution’s quality.
Finite Element Analysis of Copper Wire Bonding in Integrated Circuit Devices
Authors: Dastgir Nauman , Pasbakhsh Pooria , Guo Ning Qun , Ismail Norhazlina , Goh Kheng Lim
Published: September 2012

Axisymmetric finite element models of copper wire-bond-pad structure for an integrated circuit devicewere developed to investigate theeffects of bonding force, initial bonding temperature, Aluminum metallization thickness, bond pad thickness and free air ball (FAB) diameter on induced stresses in the wire-bond structure. The results show that an increase in bonding force greatly increased the induced stresses in the copper FAB and bond pad (aluminum and silicon). However, a change in bonding temperature while keeping the bonding force constant does not result in an appreciable change in the stress. Similarly an increase in aluminium metallization thickness does not yield appreciable variation in the stress and strain in the bond pad. Over the range of FAB diameters studied it is found that bigger FAB yields smaller stress in the overall structure
A Creative Design for Assistive Bicycles
Authors: Liu Kai Chang , Qian Yin Bin , Ma Wen Bin , Lin Zhen Yun , Wu Yun Jie
Published: September 2012

In order to solve the travel problem of the disabled with good feet but handicapped hands, the patent No.200720006653.6 is redesigned and improved in this paper. What’s more, the conception on a novel assistive bicycle is put forward. The bicycle is constituted of wheels, frame, leg steering control, gear drive mechanisms and a adjustable- height seat，and it can be controlled flexibly and easily by feet. It is light and practical.
Comparison between the RCF Performance of TiN- and TiO2-Laser Coated Ti64 Bearings
Authors: Santos Edson Costa , Rozwadowska Justyna , Kida Katsuyuki , Honda Takashi , Mizobe Koshiro , Kashima Yuji , Matsumoto Ryo , Guo Chun
Published: September 2012

The present work is a comparison between the rolling contact fatigue (RCF) of laser processed titanium bearings by using a scanning Nd:YAG Q-sw laser. TiN and TiO2 layers were produced on Ti6Al4V (Ti64) in a closed chamber in nitrogen and air atmosphere, respectively. The average thickness of the layers was 2 m in case of TiN and 0.8 m in case of TiO2. Both non-coated and coated bearings were RCF tested in under-water conditions and it was found that laser processing greatly improved their wear resistance and load capacity. Almost 50-fold and 20-fold increase in the wear resistance of the TiN and TiO2-coated bearings was observed after 7.7x106 cycles at a load of 150 N and 600 rpm. The mechanism responsible for this improvement is thought to be the 3-body-contact between the bearing elements and the small TiN and TiO2 debris, coming from the worn coating layers. The maximum load capability of the non-coated, TiN-coated and TiO2-coated bearings were 150 N, 200 N and 600 N. It is concluded that the higher load capacity of the TiO2 compared to the TiN coatings is due to its lower coefficient of friction.
Ultimate Strength Analysis for a Concrete Beam after a Sustained Building Fire
Authors: Chou Kuo Da , Lin Cherng Shing , Yu Chia Chun , Wang Shih Cheng
Published: September 2012

More than 90% of the buildings in Taiwan use reinforced concrete (RC) structures. It is crucial to human life and property to determine whether the RC structure is safe after fire damage. However, it is impossible to obtain fire thermal parameters quantitative data from actual building fires. Therefore, numerical simulation software that simulates fire scenarios was used to model fires for fire protection engineering. Beam strength decreases because of high temperature. To obtain precise beam temperature profiles in a building fire, this study used the fire model FDS and field model PHOENICS software to simulate fire development and beam inner temperature variation. Fire scenarios and beam surface temperatures in a room fire were analyzed by the FDS fire model. Beam boundary temperatures were transferred into the PHOENICS field model to compute the detailed temperature profile within the beam. The structural strength was estimated by using beam various cross-section temperatures to investigate dynamic ultimate bending moment of a RC beam in a room fire. Through the various simulations and calculations, this investigation obtained the influence of various beam positions, fire intensity, fire duration and fire damage sustained (whether two or three faces) by a RC beam after a building fire.
Reliability Optimization Design for Mechanical Components
Authors: Xia Cheng Yu , Liu Qing You , Ma Jian , Qian Li Qin
Published: September 2012

The traditional reliability model of mechanical components can not well reflect the effect of strength degradation on reliability。In the paper, A new method is applied to develop a dynamic reliability model of mechanical components considering the strength deterioration with time passing。The calculated result s by a real example show that could not only calculate the failure probability of the response, but also could make the process of optimization of the response under the conditions of meeting reliability restraint.
Analysis Design for Assembly by MTM-2 (Methods Time Measurement-2) for Wood Joints in Furniture
Authors: Choodoung Sakkarin , Smutkupt Uttapol
Published: September 2012

This research study assembly process of a study of Wood Joints with Motion Time Study MTM-2 (Methods Time Measurement-2) and DFA (Design for Assembly) an assessment of the ability to assembly in the Feeding and Fitting. with LUCAS Assembly Evaluation Method for the results of the assessment and find the good-bad points of the assessment was applied. Wood Joint Index for this analysis is the feeding and fitting should not exceed 2.5 The pivot of the three groups in terms of feeding Index did not exceed 2.5 The advantages of the assessments, when applied to the wood. In general, the nature of Wood Joints must rely on to tool help in almost all assemble of the joints. Each tool is the difficulty of performing it. And in the Entrance of the parts are in a bad score. Tolerance in the 0.2 to 0.3 mm at the Wood Joint this is limitation is that the scores of these problems. So both of these topics for Wood Joints may be more table to the assessment more accurate and led to the development process for next time.
Influence of the Rudder Time Constant on the Ship Motion
Authors: Fraga Ramzi , Liu Sheng , Leghmizi Said
Published: September 2012

The purpose of this work is to prove the influence of the rudder time constant on the ship motion; the results can guide us to the utility to have fast actuators to manipulate the rudder. In this paper, ship equations of horizontal motion are presented. These equations, called dynamic model, permit to know the position and the heading of the ship during maneuvering tests. The dynamic model is simulated for turning path and zigzag tests; every test is done for two rudder time constants.
The Development of Temperature Measurement System in Laser Molten Pool Based on Monochrome CCD with High Speed
Authors: Wu Yun Xia , Shi Shi Hong , Yu Jia Li , Yu Ling Ling , Wu Jiong Jie
Published: September 2012

Due to the present condition of temperature examination in laser molten pool which is mainly limited to infrared thermometer and thermal infrared imager ,a temperature measurement system based on monochrome CCD with high speed is developed. By transforming gray value to temperature , grayscale images of molten pool will be changed into 2 dimension distribution with color, making examination more intuitive and comprehensive .
Improved Flame Retardancy and Mechanical Properties of Composite Material S-NiMgAl-Y/EVA
Authors: Wang Li Li , Li Bin , Hu Zhong Qin , Shan Xiao Biao
Published: September 2012

The stearate surface modified LDHs S-NiMgAl-Y was rapidly synthesized based on the coprecipitation coupled with the microwave hydrothermal treatment. The cone calorimeter data confirmed that composite S-NiMgAl-Y/EVA has the good functions of both the ﬂame retardancy and smoke/toxic gas suppression. The tensile strength of S-NiMgAl-Y/EVA was increased to the maximum value of 25.6 MPa when the addition of 10 wt.% S-NiMgAl-Y to EVA. This value is markedly larger than that of the pristine EVA equaling 20.8 MPa. The composite material developed in the present work greatly contributes to the processing and application of the fire retardant material.
Outflow Curve and its Simulation for a Class of Reaction Chromatography with Gradual Changed Head-On Injection
Authors: Chen Jie Mei , Pan Tao
Published: September 2012

The reaction chromatography model for a reaction was established based on fluid dynamics theory of the chromatographic process. The gradual changed head-on injection was taken as an example, using the characteristics method of hyperbolic partial differential equations, the concentration wave solutions for reactant and resultant were derived, the behavior of outflow curves was clarified, and the simulation of outflow curves was performed. The results provided the proper theory models for further chromatographic analysis.
Pre-Strained Piezoelectric PVDF Nanofiber Array Fabricated by Near-Field Electrospining on Cylindrical Process for Flexible Energy Conversion
Authors: Liu Zong Hsin , Lin Li Wei , Pan Cheng Teng , Ou Zong Yu
Published: September 2012

In this study, near-field electrospining on hollow cylindrical (NFES) process was used to fabricate permanent piezoelectricity of polyvinylidene fluoride (PVDF) piezoelectric nanofibers. With in situ electric poling, mechanical stretching and heating during NFES process, the pre-strained piezoelectric PVDF nanofibers with high stretchability and energy conversion efficiency can be applied at low-frequency ambient vibration to convert mechanical energies into electrical signals. By adjusting rotating velocity of the hollow cylindrical glass tube on X-Y stage, electric field, baking temperature and carbon nanotube (CNT) concentration in PVDF solution, the crystalline of β phase, polarization intensity and morphology of piezoelectric fiber can be controlled. XRD (X-ray diffraction) observation of PVDF fibers was characterized. With electric field 0.5×107 V/m (needle-to-tube distance 2 mm and DC voltage 5 kV), rotating velocity 400 r.p.m, baking temperature 80 °C and 0.03 wt% CNT in NFES process, it reveals a high diffraction peak at 2θ=20.8° of piezoelectric crystal β-phase structure. Then the array nanofibers were transferred onto a parallel copper electrode by using flexible insulation epoxy/PI film to provide packaging protection. When the sensor was tested under 5 Hz vibration frequency, the maximum induced voltage was 29.4 mVp-p.
Optimization Electro Discharge Machining of Ti-6Al-4V Alloy with Silicon Carbide Powder Mixed
Authors: Saboktakin Rizi Mohsen , Razavi Gholam Reza , Ostadmohamadi Mojtaba , Havaie Ali Reza
Published: September 2012

The Ti-6Al-4V alloy is the most important and widely used titanium alloy which enjoys the welding, forging and machining capabilities. However brittle at high temperatures and low thermal conductivity caused restrictions to deformation and machining of this alloy. So advanced methods machining such as Electrical discharge machining has been developed for titanium and its alloys. One of the ways to improve the performance of electrical discharge machining method is to add the powder to the dielectric. Depending on the type of powder used the different results are achieved. In this study the effect of silicon carbide powder on electrical discharge machining of titanium alloys has been studied. Results suggest that the addition of silicon carbide powder in an electric discharge machining method reduces the roughness and rate filings will be taken. The experimental results showed that the addition of silicon carbide powder will have a positive effect on reducing corrosion of the electrode.
Dynamic Scheduling Using Immune Genetic Algorithm for Agile MES
Authors: Li Shu Xia , Cao Huan , Shan Hong Bo
Published: September 2012

As a bridge links the upper enterprise planning system and the lower shop floor control system, enormous real-time information interact in shop floor, which poses great difficulty for scheduling of manufacturing execution system(MES). To meet the requirement of MES agility in the volatile information environment, dynamic scheduling becomes one of most widely used methods. In this paper, a modified immune genetic algorithm which incorporates artificial immune mechanism into genetic algorithm is presented to solve dynamic job shop scheduling problems. Owing to its good solving capability and computing speed, the algorithm could utilize real-time production information to generate predictive and reactive scheduling solutions. At last, the algorithm is applied in a MT10×10 job shop proved to be effective in obtaining better solutions than traditional genetic algorithm.
Implementation of Remote Monitoring System Based on SNMP Protocol and Virtual Instrument for Shipborned Equipments in TT&C
Authors: Chen Kai , Ma Yuan Yuan
Published: September 2012

Condition of TT&C equipment is very complex, and there are many state parameters. It is a significant issue to be solved in limited bandwidth. SNMP has been successfully applied to monitor equipment condition in many industrial fields, but has not been applied to monitor TT&C equipments at present. Using virtual instrument as software development platform, a method based on SNMP protocol is presented for Remote Monitoring System of TT&C equipment. Then the system is verified. It was concluded that parameters and status of TT&C equipment could be retrieved using SNMP protocol no matter which communication method the equipment supports.
The Measurement of Liquid Level Based on Peak Image Recognition Technique
Authors: Cao Hui Dan , Shen Yu Ming
Published: September 2012

A new kind of device measuring liquid level automatically is developed which is composed of camera, illuminating system and industrial computer. It’s based on image measurement technology. The image of the transparent glass liquid level gauge which is installed on the volumetric tank of a flow calibration facility is captured by a camera. After a series of image pre-processing, such as interception, gamma correction, edge detection and so on, the value of liquid level which is the liquid level of the tank can be got by so called peak method. The measurement error is 0.1mm.
The Design and Study on Actuator Performance Test System
Authors: Tian Guo Fu , Ren Zhong Wei , Sun Shu Hui
Published: September 2012

According to the inconvenience and technical requirements for the current tests, a new method for the linear displacement detection of actuator was introduced in this paper. The actuator stroke detection system was developed based on linear displacement sensor and data acquisition card. This system can meet the precision requirements and it has high efficiency and stability.
Empirical Study on Correlation of Manufacturing Companies’ Compensation Gap with the Performance
Authors: Wang Lu Zhuang , Yu Hui
Published: September 2012

This paper studied the relationship between executives' compensation gaps and enterprise’s performances of Textile industry in China. By linear regression and relative analysis, it is found that the correlativity of executives’ compensation gap with performance is weak or none with only effective gap between the president and CFO, the compensation gap of executives in coastland areas is larger than inland areas, a positive correlation existed between ownership concentration and enterprise performance, ownership concentration is negatively correlated to executive compensation gap, and the state-owned stock ratio and asset-liability ratio have negative correlation to enterprise performance.
Design and Application of MMM System for Welding Residual Stress Test
Authors: Xing Hai Yan , Qin Ping , Lou Yan Min
Published: September 2012

In order to apply metal magnetic memory (MMM) technology to welding residual stress testing, the MMM hardware and software system is designed. The software subsystem is based on object-oriented programming and the hardware subsystem is portable. The MMM system can test the welded joint residual stress distribution, residual stress concentration zones and defects at workshop. Moreover, the MMM testing system can output data to a computer not only for automatic evaluation but also for further analysis and evaluation with expert intervention. According to the trend of the MMM characteristic, the welding residual stress concentration and defects can be detected and evaluated. The field X-ray examination result is consistent with the result of the MMM testing system, which has proved the accuracy and engineering practicality of the MMM testing system.
A Ship Deformation Measurement Method Based on Quasi-Static Model
Authors: Gao Wei , Shi Hong Yang , Liu Xin Tao , Ben Yue Yang
Published: September 2012

Angular matching method was used to measure ship’s deformation, three-axis fiber optic gyroscope units(FGU) are installed on various point of the ship, based on the model advanced by Mochalov, considering the character of ship’s static deforming angle varies, a quasi-static model was established, Kalman filter was introduced to estimate the ship’s quasi-static and dynamic deforming angles. To make the estimation more precise, gyro drifts was taking into account. Besides the theory simulation, practical experiment in sea area is also carried out, which lays the firm foundation for actual application of ship deformation measurement based on three-axis fiber optic gyroscope.
Research on the Accuracy of Mask Projection Stereo-Lithography
Authors: Wang Yi Qing , Wu Hua Ying , Jia Zhi Yang , Huang Wei , Sun Kun , Lu Bing Heng
Published: September 2012

In this research, sub-region curing and mask DPI modification are used to improve the accuracy of MPSL. Because the curing shrinkage at the discrete region does not cause the shrinkage of the entire resin surface, the accuracy of the RP work piece under sub-regional MPSL can be improved effectively. For the optical system error, the accuracy can be improved through the DPI (Dot per Inch) modification. The research results show that accuracy of work piece less than 12mm can be improved through DPI (Dot per Inch) modification. For the work piece above 16mm, the main method which improves the accuracy can adapt sub-region curing procedure. The combination methods of sub-regional exposure and exposure mask DPI modification can significantly improve the dimensional accuracy of parts, and the overall size of the error of parts can be controlled less than 1%.
Research on Application of Processing Technology and Magnesium Alloy Materials
Authors: Lin Qing Fu
Published: September 2012

Based on introducing the performance of magnesium alloys materials, analysis of magnesium alloy process performance mainly from chemical activity, electrochemical corrosion, the linear expansion coefficient of magnesium alloy; focuses on six kinds of magnesium alloy forming technology and processing problems in die casting, forging and extrusion forming, semi-solid forming, rapid solidification, provide a reference for magnesium alloy welding and surface coating technology.
Process Research of Laser Variable-Spot Overlap Cladding Based on Inside-Laser Coaxial Powder Feeding
Authors: Cao Fei , Shi Shi Hong , Fu Ge Yan , Zhang Yi Shao , Li Ji
Published: September 2012

Analyze the contradiction of laser cladding rapid prototyping between cladding efficiency and cladding precision, this paper advanced laser variable-spot cladding process with small facula outlining border of workpiece and big facula filling in central section of workpiece in order to improve the influence of “Step effect”. Based on the patent technology of “Hollow laser beam and internal power feeding”, the experiments of laser variable-spot overlap cladding are carried out on the substrate of 45# steel with a novel device of coaxial inside-beam power feeding. The experimental results were analyzed to provide a theoretical basis for the promotion and application of laser variable -spot overlap cladding.
Exploratory Research on Earnings Forecast Model-Based on Chinese Manufacturing Companies
Authors: Wang Lu Zhuang , Wang Zheng Yuan , Yuan Zi Shu
Published: September 2012

This paper takes China's manufacturing listed companies as an example, applies matching T test to select key financial indicators, uses factor analysis to determine the main factors, and explores company earnings forecast models by comparing different kinds of stepwise regression plans. Empirical results showed that by means of properly linear combination of key financial indicators from this year, it is possible to estimate the earning, EPS, for next year. The accuracy of the forecast can reach 80% for Top 10 profitable enterprises, and 62% for Top 100, which validated the effectiveness of this exploration for earnings forecasting. Finally, based on the prediction model, the authors put forward some suggestions for improving financial management of listed companies.
Research on Road Surface Cracks Detection Based on Rough Set
Authors: Dong Wei , Zhu Fang Fang , Yin Zhong Dong , Zhang Chan
Published: September 2012

The road surface horizontal fracture, sink. Road image by filtering to remove noise, edge detection using several classical operators were analyzed, we propose a rough sets and fuzzy sets based on the morphological model, and apply it to the pavement crack image. By contrast to the other classic method, indicate that the method has successfully completed in the image edge detection.
Surface Crack Growth from Small Indentations in a Silicon Nitride Square Bar under Cyclic Reversed Torsion
Authors: Kida Katsuyuki , Honda Takashi , Santos Edson Costa
Published: September 2012

In order to investigate the mechanism of surface cracks in silicon nitride ceramic (HIP-Si3N4) from the viewpoint of shear stress, the authors focused on torsion fatigue testing and observed the crack growth behavior under conditions where the stress ratio was R = - 1. Furthermore the residual stresses around the cracks were measured. Based on these results, mode II growth of surface cracks is discussed and it was concluded that under stress ratio R = -1, surface cracks grow slowly in mode II, for ΔKⅡ less than 3.6MPam1/2.
Twin Tube Shock Absorber Thermo-Mechanical Coupling Simulation
Authors: Liang Liang , Tian Liang , Zhang Yun Qing , Zhang Jie
Published: September 2012

During the working process, temperature of the oil increases and its viscosity decreases due to the damping force, resulting in changes in operating characteristics of the shock absorber. This paper firstly analyzes the mechanism of themogenesis and heat transfer means of shock absorber in details, and then establishes the thermodynamic model of shock absorber with the energy conservation law and the first law of thermodynamics on this basis. After a comparison between the simulation results and the experimental results, causes of error will be analyzed. The study shows that the more influential correlations are the internal flow convection correlation used between the oil of the different chambers and the tubes of the shock absorber and the external flow convection correlation between the outside tube of the shock absorber and the ambient air.
Transonic Drag Prediction on a DLR-F6 Transport Configuration
Authors: Zheng Qiu Ya , Feng Jian Hu , Shen Zun Huan
Published: September 2012

The accuracy of the drag prediction is investigated by simulating the transonic flow fields around the DLR-F6 wing-body (WB) and wing-body-nacelle-pylon (WNP) configurations. A series of coarse, medium, and fine density multi-block structured patched grids for both the DLR-F6 WB and WBNP configurations are employed to examine effect of grid on forces and incremental drag by adding the nacelle and pylon. The effect of boundary layer transition specification on the drag and incremental drag are also estimated. The results show that grid refinement decrease WB total drag by 6.8 drag counts, WBNP total drag by 15.3 drag counts. Specifying transition reduce WB total drag by 9.7 drag counts, WBNP total drag by 11 drag counts as compared to fully turbulent boundary layer computations, but transition has little effects on nacelle/pylon incremental drag.
Research on Network Examination System Model Based on Multi-AGENT
Authors: Yu Yan , Wang Jian Hua
Published: September 2012

With the development of artificial intelligence, Multi-agent technology is applied more and more in reality. In line with multi-user intelligent network examination test system, this paper proposes multi-agent-based general examination system model constituted by multiple mutually independent but collaborated AGENTs. In addition to fulfill their respective responsibilities, every single sub-Agent communicates among each other to gain information and complete missions in a collaborative form. Also, dedicated data mining AGENT is deployed in the system to conduct intelligent analysis and processing on various data, thereby providing decision support for teachers’ teaching and student’s study duties. And this paper presents a new clue for establishing intelligent network examination system under distributed environment.
Investigation into Influence of Cutting Fluid and Liquid Nitrogen on Machined Surface Residual Stress
Authors: Qin Meng Yang , Ye Bang Yan , Wu Bo
Published: September 2012

This paper gives the details of turning experiments on AISI 1045 steel by using various cutting fluid and liquid nitrogen condition. Residual stress on machined surface is generated in rough machining and fine machining with different rounded cutting edge radius. The effects of cutting fluid and liquid nitrogen on residual stress state are obtained by compared with dry cutting. Experimental results show that cutting fluid and liquid nitrogen have influence on machined residual stressl and liquid nitrogen generates residual compressive stress in all specimens.
A Study of Transverse Shrinkage and Vertical Displacement in Induction Triangle Heating
Authors: Nguyen Truong Thinh
Published: September 2012

Deformations including transverse shrinkage and vertical displacement of induction triangle heating play an important role in shipyard. However, the deformations and behaviors of plate after heating are complex, the analysis of this process consumes much time and expensive. The objective of this paper was to develop an analytical solution to determine transverse shrinkage and vertical displacement in induction triangle heating based on laminated plate theory. The plastic region in the analytical solution of the angular deformation and shrinkage of a steel plate is obtained from the thermal analysis of the plate with the heat input calculated from the electro-magnetic analysis of the induction heating process. Calculated values obtained with analytical solution correspond closely to the experimental results.
Multivariate Time Series Prediction Based on a Simple RBF Network
Authors: Xi Jian Hui , Wang Hai Dan , Jiang Li Ying
Published: September 2012

Improvement on defining hidden layer’s clustering centers of RBF network is greatly important for the network modeling and prediction, especially for multivariate time series. This paper firstly uses a linear function and a nonlinear function respectively to detect the linear correlations and the nonlinear correlations of the time series. And a small data set which includes effective information of the system is defined. Then, a local search procedure is introduced to optimize K-means clustering algorithm, which is aimed at quickly and effectively adjusting hidden layer’s clustering centers. Finally, input other training samples to determine network weights, LS or its improved method can be selected. Simulation results show that compared with that of conventional RBF network, with the same number of hidden layer’s nodes, the RBF network model in this paper gets better prediction accuracy.
Effects of Hot Working and Heat Treatment on Properties of Ti-62A Alloy Plate
Authors: Liu Rui , Hui Song Xiao , Ye Wen Jun , Yu Yang , Fu Yan Yan , Song Xiao Yun , Deng Xi Guang
Published: September 2012

A titanium alloy with the composition of Ti-Al-Sn-Zr-Mo-V-Si-Cr, named Ti-62A alloy, were rolled into thick plates by four different routes, followed by solution heat treated and aging treated. Effects of various rolling routes and heat treatment processes on tensile properties, fracture toughness and resistance to fatigue crack growth were investigated. The results reveal that a rolling heats above β-transus before final rolling pass is helpful to improve comprehensive properties. The properties of Ti-62A alloy can be adjusted in a large range depending on heat treatment.
Effects of Processing Technic on Grain Size of Copper Clad Steel Wire
Authors: Wu Qing Mei , Wang De Qing , Gao Yang
Published: September 2012

The method adopted to manufacture copper clad steel wire in this study is cladding and welding and then drawing and annealing it. The effect of drawing deformation and annealing treatment on the grain size of α-Fe phase were studied. Experimental results show that the grain sizeα in cross section of α-Fe phase is decreased with the increase of the drawing deformation. Grains of the longitudinal section are elongated toward the drawing direction and appeared a strip shape. The grain size in cross-section of α-Fe phase is enhanced with the increase of the annealing time and annealing temperature, its length diameter ratio in longitudinal section is decreased oppositely. The grain size in cross section and length diameter ratio in longitudinal section are almost invariant in 850 °C for 2 h, the grain in longitudinal section tends to be equiaxial, the recrystallization processes is thus finished at this moment. Through the experimental data analysis, the regression equation about the relation of annealing temperature and annealing time of CCS with the grain size in cross section and length diameter ratio in longitudinal section are obtained.
Process Mineralogy of an Oolitic Hematite Ore and its Implications for Mineral Processing
Authors: Dai Hui Xin , Zhao Wei , Gao Li Kun , Song Bao Xu
Published: September 2012

Based on process mineralogical study of an oolitic hematite ore in SW China, the texture and structure of the ores, the occurrence of iron minerals and the dissemination of them are determined in detail, which provides scientific reference for forthcoming mineral processing technology. The mineralogical results show that the sizes of the grains are generally under 0.01mm, so the minerals cannot be liberated completely by traditional grinding technology. Moreover, the objective minerals are the assemblages of hematite and chlorite, whose amount is highly variable, so the magnetism also varies widely. Therefore, during the coming magnetic separation tests, the increment of the magnetic intensity should be strictly manipulated to determine the best condition for the ores.
Microstructure and Properties of In Situ Fabricated Al-5wt.%Si-Al2O3 Composites
Authors: Cheng Ling , Zhu De Gui , Gao Ying , Li Wei , Wang Bo
Published: September 2012

Alumina reinforced aluminum matrix composites (Al-5wt.%Si-Al2O3) fabricated by powder metallurgy through hot isotactic pressing were sintered in different processes, i.e. solid and liquid phase sintering. Optical microscopy (OM), X-ray diffraction (XRD), scanning electron microscope (SEM), Energy Dispersive X-ray (EDX) techniques were used to characterize the sintered composites. The effects of solid phase and liquid phase sintering on density, microstructure, microhardness, compression and shear strength were investigated. It was found that in situ chemical reaction was completed in solid phase sintering, but the composites had lower microhardness, comprehension and shear strength due to low density and segregation of alumina and Si particles in microstructure. Segregation of reinforcement particles in solid phase sintering resulted from character of solid reaction and Si diffusion at high temperature over a long hold time.
The Study of Microstructure and Electric Resistivity of SiC Thin Films Produced by MF Magnetron Sputtering
Authors: Li Yang Yang , Hao Jun Jie , Wang Xiao Jia , Wang Rui Xin , Guo Zhi Meng
Published: September 2012

SiC films were prepared by mid-frequency (MF) magnetron sputtering with two targets (SiC and C) on monocrystalline Si(100) and Al2O3 substrates. During the study, different annealing temperatures and working pressures were set. The surface morphology of SiC films was studied by SEM, while structure was characterized using a conventional X-ray diffractometer. SEM images had shown the surface morphology of SiC films was related to substrates. It was also found that working pressure had a big influence on the structure of SiC films through the XRD patterns. The film was mainly based on 3C-SiC when working pressure wass 0.3Pa, and 4H-SiC when 0.6 Pa. Another conclusion was that the resistivity of 4H-SiC was larger than that of 3C-SiC.
Hysteretic Behavior of Steel Members Strengthened with CFRP under Cyclic Lateral Loading in Different Temperature
Authors: Li Yi Heng , Li Zhen Guo
Published: September 2012

With the development of strengthening and repairing technology, carbon fiber-reinforced polymer (CFRP) has been widely applied in concrete and masonry structures for high efficiency. However, there is limited information about how they can be used to strengthen steel members. This paper presents the strengthening effect of CFRP on steel column under cyclic lateral loading in thermal environment. The results indicate that application of CFRP in steel column under cyclic lateral loading in thermal environment has substantial benefits. In particular, the CFRP wraps can improve the ultimate cyclic lateral load and ductility of steel column prominently in thermal environment which can meet the higher requirements of stiffness.
Synthesis of Graphene-ZnS Nanosheets Composite by Layer-by-Layer Self-Assembly and Hydrothermal Homogeneous Precipitation Method
Authors: Wang Zong Hua , Bi Li Shun , Xia Jian Fei , Zhang Fei Fei , Xia Yan Zhi , Li Yan Hui
Published: September 2012

A facile and efficient strategy for the synthesis of graphene-ZnS nanosheets composite (G-ZnS) is demonstrated for the first time. Firstly, functional graphite oxide (GO) was fabricated by the layer-by-layer (LBL) self-assembly of poly (diallyl dimethyl ammonium) chloride (PDDA) and poly (styrene sulfonic acid) sodium salt (PSS) in proper order. Then, the functional GO dispersed in the water-Tween 20 system as substrate material, in which Tween 20 (polyoxyethylene sorbitol anhydride monolaurate) acts as growth template. Subsequently, G-ZnS nanosheets composite was obtained via hydrothermal homogeneous precipitation.
Study of Tungsten Cathode Doped with Rare Earth for Pulsed Xenon Lamp
Authors: Liu Jian Jun , Li Hai Bing , Wu Rui Hua , Shao Ruo Yan , Jiang Bao Cai
Published: September 2012

High powered pulsed xenon lamp is widely used in laser inertial confinement fusion research as the optical pump source. And the cathode is very important for the performance of xenon lamp when operated as pump sources of lasers. With the development of material and technology new tungsten electrode doped with rare earth elements has been developed as cathode of xenon lamp.
Research on the Thermal Performance of New Sandwich Insulation Composite Wall Panel
Authors: Xia Shan , Xia Guang Hui , Cui Jian Hua , Yin Wan Yun
Published: September 2012

Based on the energy saving design standards in hot summer and cold winter zone like Anhui province, a new type of sandwich insulation composite wall panel is researched, Influence on thermal performances of new sandwich insulation composite wall panel，due to in different thermal insulation material, different content of the oblique connection rebar, different thermal insulation layer thickness and different internal and external wall thickness, are analyzed. The results show that, in not take extra insulation measures, this kind of sandwich insulation composite wall panel thermal performance can meet the hot summer and cold winter area energy-saving design standard requirements. Research results and practical engineering contact tightly, It has a comparatively high practical value.