bluuebunny/crossref_metadata_2025 huggingface dataset:
Optimized Tool Path Planning for Five-Axis Flank Milling of Ruled Surface Considering Tolerance
Authors: Tian Jun Feng , Lin Hu , Yao Zhuang , Li Jie
Published: February 2012

Five-axis CNC flank milling has recently received much attention in industry. Tool path planning is a critical issue in five-axis CNC flank milling operation. Previous work based on dynamic-programming generated optimal tool path by global minimising the machining error. However, global minimal machining error may not guarantee a local machining error controllable. Therefore, this paper proposes a method based on combination of global and local optimization, which makes tool path of five-axis flank milling optimal and error controllable. Oversize error of tool paths can be partially adjusted so that a specified tolerance is met in global optimization processing. Finally, the experiments of the simulative are made by this algorithm. The result verifies the feasibility and validity of the proposed scheme.
Fast, Two-Steps Syntheses and Characterization of Octa(Aminopropylsilsesquioxane)
Authors: Hou Yong Gang , Zhang Qiu Yu , Zhang He Peng
Published: February 2012

Efficient two-steps method for the synthesis of octa(aminopropylsilsesquioxane)(OAPS) was described in this paper. The chloride salt of OAPS was prepared by the hydrolytic condensation of γ-aminopropyltriethoxysilane in methanol, with hydrochloric as a catalyst. The influence of several processing on the synthesis has been ascertained. The chloride salt of OAPS can be obtained in 42.1% yield after a reaction time of 18h, which is a much shorter than that required for traditional method. Neutralization of the chloride salt of OAPS to OAPS was accomplished by eluting solutions of this hydrochloride in methanol through a column of Amberlite 717 ion-exchange resin. The structure of products was determined by FTIR, MS, Elemental analysis, 1H, 13C, and 29Si NMR. TG curve of OAPS shows that the compound has high decomposition temperature and higher char residue yield.
Phase Transformation Behavior and Microstructure Characterization of 9Ni Cryogenic Steel
Authors: Wang Duan Jun , Wang Yu Hui , Liu Li Gang , Liu Wen Jun , Zhao Xi Qing , Wang Qing Feng
Published: February 2012

The SHCCT (simulated heat affected zone continuous cooling transformation) of 9Ni cryogenic steel were investigated. The microstructures observed in simulated heat affected zone (HAZ) continuous cooled specimens are composed of bainite (B) and martensite (M) depending on the cooling rates. The dimension of prior austensite grain, M-A constituent content, M-A dimension, M-A area density increase with increased the time of t8/5.
Study on Composites for Furniture with Waste Paper and Wood Particle
Authors: Yue Kong , Liu Wei Qing , Lu Xiao Ning , Lu Wei Dong , Yang Hui Feng
Published: February 2012

The manufacturing process of particle composite for furniture, made of waste paper and wood particle, was studied and discussed in this paper, and an ornament cabinet and a Chinese style teapoy were assembled in the laboratory with the composite. The results showed the mechanical properties of composite made of waste paper, was low. Wood particle was blended with waste paper and made into composite, and the mechanical properties of the composite could meet the demand of particle board for furniture and ornament under the Chinese national standard. The application of waste paper-based composite was feasible technically.
Effect of Arc Length on Weld Appearance and Metal Transfer in Twin-Wire GMAW Process
Authors: Chen Huan Ming , Wu Shao Jie
Published: February 2012

The experiments were performed with the twin-wire GMAW machine of Fronius product. The metal transfer process and the arc shapes were observed by use of shadowgraph technique with a high-speed camera. When the arc length increases during twin-wire CO2 arc welding, the mode of metal transfer changes from short-circuiting transfer to globular transfer, and to spray transfer. But it is difficult to form a stable spray transfer process, and the weld appearance becomes worse. The short-circuiting transfer in twin-wire CO2 arc welding can improve the process stability.
The Application of Fuzzy ANP in the Development of New Product Decision-Making - A Case Study of the Solar Module Industry
Authors: Chen Wen Chin , Chang Hui Pin
Published: February 2012

Due to the increasing advancement in technology and limited resources as well as environment being polluted at the same time, the natural solar energy, which has the advantage of environmental protection and being the newly developed approach, will become the rushing field of study around the world in order to implement energy efficiency and reduce carbon pollution. In the meantime, the solar industry technology and new product development have become the considerations to the survival and competitiveness of enterprises. In this study, literature review and expert interviews are utilized to obtain five major key dimensions and 19 subordinate criteria regarding new product development. The Interpretive Structural Model (ISM) is employed to obtain the dimension-dimension and criterion-criterion dependence relationship, and used the Fuzzy Analytic Network Process (Fuzzy ANP) to determine the top priority weight for assessment improvement in the new product development solutions of the enterprises.
A Seam Image Processing Method Based on Wavelet Compress
Authors: Ma Guo Hong , Wang Cong , Yang Ze Hong
Published: February 2012

This paper designs several common methods, which is applied to situation that seam image could keep the same format when it is compressed, then analyses several problems existing in image processing. According a comparison in sundry compress methods’ characteristics and application, this paper eventually chooses a compress method that is suitable to original image, which is based on wavelet transform image compression and coding. Compress experiments shows that, the image compression ratio this paper designs could be exceeded up to 0.74 on the condition of the same format. The quality of seam image is basically intact, which could provide a desirable method in seam image efficient transmit.
Stress and Strain Concentrations in an Elasto-Plastic Bar of Circular Cross-Section with Semicircular Groove
Authors: Hou Jian , Yang Zheng
Published: February 2012

The elastic stress and strain fields in an elasto-plastic circular cross-section bar with semicircular groove subjected to uniaxial tension are systematically investigated using the finite element method. It is found that the stress and strain concentrations are different, especially after the partial region near the groove root yielding. The coupled influences of the loading levels and Poisson’s ratios on the stress and strain concentrations are examined. The maximum of strain concentration factor is always at the groove root, but the maximum of stress concentration factor is at the groove root only while the loading levels are lower.
Impedance Matching between Signal Generator and Piezoelectric Transducer
Authors: Tan Zhen Jiang , Zhou Ming
Published: February 2012

In order to acquire enough energy, high power pulse must be used to drive a piezoelectric transducer. At the same time, it is a key technology to design an impedance matching circuit between a signal generator and a piezoelectric transducer so that signal source can transmit energy to the piezoelectric transducer effectively. In the paper, the impedance matching theory is analyzed. And, a method of using an oscilloscope to measure resonance frequency of the piezoelectric transducer is tested, through which, a perfect matching circuit is designed.
Automatic Flight Control of Unmanned Helicopter Based on Nonlinear Model
Authors: Guo Run Xia
Published: February 2012

The Unmanned helicopter (UMH) movement was divided into two parts, namely, attitude and trajectory motion. And then a two-timescale nonlinear model was established. The paper improved and expanded state dependent riccati equation (SDRE) control approach, deriving analytical conditions for achieving global asymptotic stability with lyapunov stability theory. Proof was given. By combining improved SDRE control with nonlinear feed-forward compensation technique, the full envelop flight attitude control laws could be designed. On the basis of attitude control, trajectory controller was developed. Actual flight tests were carried out. Test results show that the control strategy is highly effective.
A New Numerical Algorithm for Transmission Error Measurement at Gears Meshing
Authors: Xu Ai Jun , Deng Xiao Zhong , Zhang Jing , Xu Kai , Li Ju Bo
Published: February 2012

Many different methods have been developed for the measurement of transmission error (T.E.) at gears meshing. Each strategy improved the measurement performance is based on comparing the phases of sequence signals by counting the number of encoder pulses. The phase comparison method of T.E. is a dynamic measurement algorithm with lower angular resolution and many constrained conditions. This paper presents a new numerical algorithm aimed to provide the high accuracy information of instantaneous T.E. in the form of angular displacement. The analysis approach uses phase shift and demodulation technology in frequency domain to process the signals generated by encoders fixed on the both shaft of the gear driving mechanism. Finally, the algorithm is tested by simulation of gear meshing signal in Matlab software.
Design of the System for Online Monitoring Dielectric Loss
Authors: Zheng Jian Feng , Qiang Hao
Published: February 2012

For knowing the dielectric loss of high-voltage capacitive electrical equipment timely and mastering the electrical insulation of high voltage equipment effectively to ensure the reliable operation of these voltage equipments, an online monitoring system is designed in this paper based on the practical project. The system is made up of two parts including lower computer and upper computer. Using the microcontroller C8051F023 as the core of the lower computer and adopting an improved zero-crossing comparison method, the measurement of dielectric loss is realized and the data are sent to upper computer by wireless way. SQL2000 is used in the upper computer for data management, which can be real-time displayed, inquired and printed in report forms. At present, this monitoring system has successfully applied in the Houqiao 330 kV transformer substation in Ningxia. The operating results show that the system can meet well the online monitoring demand of the high voltage capacitive electrical equipment.
Design and Analysis of a Grinding Machine for Back Gouging of Outer Circumferential Weld
Authors: Liao Ying Hua , Zhang Liang Dong , Wang Chun
Published: February 2012

In order to improve the efficiency of back gouging of large thick wall vessels and the work condition, and to reduce labor intensity, this paper presents a large-power, compact-structure and easy-and-simple-handled grinding machine for back gouging of outer circumferential weld. This grinding machine consists of grinding head, manipulator and guide rail. Since a grinding electric spindle, in which a grinding spindle is directly connected to a motor, is used in grinding head, the structure of the drive system is greatly simplified. Firstly the grinding head can be controlled closer to weld for back gouging in a certain pose by the arm back, up down traverse of the arm, longitudinal and lateral movement of the manipulator. Secondly, radial force can be produced between grinding head and weld line by the arm telescopic and radial force can be kept constant by a flexible device. The manipulator is set up on the guide rail, so it can control the grinding head to accomplish back gouging of multiple welds. When the grinding head is set up on the different functional manipulator, it can accomplish back gouging of internal or outer circumferential-weld and straight-weld. As the power of grinding machine is large and the process of back gouging is high automation, the time of back gouging can be reduced by one fifth to one third and the efficiency of back gouging is significantly improved, and security and comfort of back gouging of weld can be increased as well.
Microstructure Characteristics of Fe-xCr-C Hardfacing Alloys
Authors: Zong Lin , Liu Zheng Jun
Published: February 2012

A series of Fe-xCr-C hardfacing alloys were successfully fabricated on a substrate of 20g steel by gas tungsten arc welding (GTAW) process. These claddings were disigned to observe hypoeutectic, near-eutectic, and hypereutectic structures with various Cr3C2 and M7C3 carbides at room temperature. According to X-ray diffraction(XRD) and optical microscopy (OM), the hypoeutectic and eutectic composites include the Fe-Cr solid solution(α+A) and Cr3C2 carbides. Hypereutectic structures consist of α+A+M+M7C3 respectively. The cladding of hypereutectic microstructure with great amounts of primary M7C3 carbides had the highest hardness of the all conditions.
Research on the Influence of Ocean Atmosphere to Infrared Detection
Authors: Chen Yu , Hu Yunan , Kou Kun Hu , Li Hai Jun , Zhang Gang
Published: February 2012

Ocean atmospheric transmittance is an important factor to influence detecting distance of infrared system. The influence efficiency of infrared detection is studied by using modtran, on the basis of studying the character of infrared transmission. Firstly, major absorption band of vapor, carbon dioxide, ozone and vapor continuum and the change of transmittance in boundary layer, troposphere and stratosphere are analyzed. Secondly, atmospheric window transmittance of navy maritime aerosol in horizontal path and slant path is analyzed, and the influence of four types of maritime aerosol is also analyzed for navy maritime aerosol. Lastly, the influence of five model atmospheres to total transmittance is analyzed.
Mechanical Properties of Hydrogen Functionalized Graphyne - A Molecular Dynamics Investigation
Authors: Yang Yu Lin , Fan Zhe Yong , Wei Ning , Zheng Yong Ping
Published: February 2012

In this paper the mechanical properties of a series of hydrogen functionalized graphyne are investigated through acting tensile loads on the monolayer networks. Molecular dynamics simulations are performed to calculate the fracture strains and corresponding maximum forces for pristine graphyne along both armchair and zigzag directions. Furthermore, hydrogen functionalized graphynes with different functionalization sites are analyzed to investigate the effect of functionlization on the mechanical performance. Finally, Young's modulus of all the investigated architectures are computed. The obtained results show that monolayer graphyne is mechanically stable with high strength and stiffness, and the mechanical performance can be tuned through structure engineering and functionalization.
Catalytic Effect of Triethylamine on the Urethane Reaction of Asymmetry Diol
Authors: Yang Peng Fei
Published: February 2012

The urethane reaction kinetics of 1,2-propanediol and 1,3-butanediol with phenyl isocyanate are investigated in toluene. In-situ FT-IR is used to monitor the reaction to work out rate constant. The urethane reaction has been found to be a second order reaction and is largely accelerated with triethylamine as catalyst. Furthermore, the rate constants are different between initial stage and final stage when triethylamine is used as catalyst, which belongs to different hydroxyls in asymmetry diol. However, when there is no catalyst in the reaction system, the rate constant is the same. That is, there is no reactivity difference for hydroxyls in asymmetry diol. Moreover, 1,3-butanediol is more active than 1,2-propanediol when reacting with isocyanate.
Study on Biodegradable Behavior of Polyesters in the Soil of FuJian Local
Authors: Huang Ji Tao , Cui Chun Na
Published: February 2012

The biodegradation and biodegradable mechanism of the polyesters ,such as poly (lactic acid) (PLA), poly (butylene succinate) (PBS) and poly (caprolactone) (PCL) have been investigated; the soil of Shanxi local land and activated sludge from Ningde waste water plant played the biodegradable medium in this study. The results shown the remarkable eroded trace of the surface of the films could be found after degradation by the results of Polarized Light Microscope (PLM) and scanning electron microscope (SEM); the biodegradation of PCL is best, the PLA′s is better than that of PBS. The structures of the films determined with Fourier-Transformation Infrared Spectrum (FT-IR) after degradation.
The Fluid Power Control Performance Comparison Study of Two-Type ER Valve Based on FLUENT
Authors: Zhu Shi Sha , Tao Liu
Published: February 2012

The current flow and pressure drop of ER valve which is a new type power control valve could be adjusted by the electric field signal directly .In this paper, the fluid power control performance of concentric cylindrical ER valve and parallel plate-type ER valve based on ER principal is comparative studied .First power control equation has been analysed, and then flow simulation of internal flow field of ER valve has been taken based on FLUENT software. The results show that with the increasing of the strength of excitation field, the flow through the two different type of ER valve decreases, the pressure drop between import and export is even greater; and the fluid power control performance of parallel plate-type ER valve is superior to concentric cylindrical ER valve under the same control volume.
Numerical Simulation for Heat Transfer Process of Clinching with Magnesium Alloys
Authors: Han Shan Ling , Wu Yi Wei , Zeng Qing Liang
Published: February 2012

The clinching process of magnesium alloys has a great potential of being high efficient joining method, but it is restricted by the limited formability of magnesium alloys at room temperature. To form acceptable joints without cracking, it is usually required to heat the parts to about 220°C. However, the pre-heating times of traditional forming method is more than 3 to 6 seconds, the application of clinching for magnesium alloys is restricted by the over long periods of heating time. A new joining process with a contoured die is introduced to offer great benefits, especially in pre-heating time. Then the heat transfer process is simulated with DEFORM-3D software. The results show that the pre-heating time reduced to less than 1 second. Thus it is efficient and reliable in joining of magnesium alloys parts.
Numerical Simulation of Rock Fragmentation Process for TBM Cutters Based on Three-Dimensional Dynamic Fracturing Method
Authors: Li Gang , Zhu Li Da , Yang Jian Yu , Wang Wan Shan
Published: February 2012

The rock breakage process is the interaction process between TBM and rock mass, which is affected by TBM specifications, such as thrust force, cutter tip width and profile, cutter spacing, RPM, and torque, and rock mass properties mainly including rock material strength, rock brittleness, joint spacing and orientation. In this study, based on the systematic study of the existed rock constitutive model achievements and introduction of rock breaking mechanism, main failure mode of rock in the breaking process of disc cutter is added and revised in order to meet the actual situation. The method of establishing finite element model of disc cutter breaking process using ANSYS AUTODYN-3D software is introduced. After the dynamic simulation, we can obtain that geotechnical interface disturbance insulted by disc cutter. Based on plenty of experiments, it confirms reliability of numerical methods and provides a method to study cutting performance for different geological conditions.
Numerical Simulation and Experimental Study of Jet Distance in Abrasive Waterjet Polishing
Authors: Peng Jia Qiang , Song Dan Lu , Li Liang Chao
Published: February 2012

In this paper, it introduces the work principle of abrasive waterjet polishing (AWJP) and analyzes the jet distance to the influence of the AWJP under a certain pressure, with a numerical simulation and analysis to the jet distance based on jet mechanics and fluid dynamics. By establishing the physical models of the different jet distance of the AWJP and adopting the Realizable k-ε model and the SIMPLEC algorithm, it gains the jet flow field of the AWJP with different jet distance models and the distribution of turbulence intensity and pressure and velocity on the workpiece surface. The numerical simulation results of the different jet distance were analyzed and compared, according to the AWJP to the characteristic requirement of the jet. By doing the polishing experiment with a abrasive waterjet cutting machine, it verifies that the best polishing distance range of AWJP is from 10 times to 13 times of the nozzle diameter, which provides the theoretical basis for the process research of the AWPJ in the future.
Design of Housing Security Model Based on Family Lifecycle
Authors: Cui Yu Ying , Tian Jin Xin , Li Zhi Qing
Published: February 2012

In order to understand the demand characteristics of housing security and improve the implementation effect of security policies, the subdivided family lifecycle of low-income family housing need was analyzed by fuzzy clustering with some Harbin samples, and the characteristics of various stages of housing security need, which was meet by four modes, such as “high subsidy +cheap-rent housing”, “rent subsidy”, “home ownership subsidy+ affordable housing”, “low rent subsidy + public rental housing”. The study has positive theoretical significance and practical value on the housing security policy.
Modelling and Control of Harmonic Drive Applied in Control Moment Gyros
Authors: Tan Pan
Published: February 2012

Limited by supply voltage on board, control accuracy of low velocity and available torque of Control Moment Gyros (CMGs) gimbal driving motor are limited. Adding Harmonic Drive (HD) between driving motor and CMGs gimbal can improve CMGs control system performance. The paper establishes a practical HD model considering transmission, bearing friction, tooth meshing friction and compliance of flexspline. The model is properly simplified for analysing the control performance of whole closed loop system. Transfer functions are analysed and the flexspline output velocity is chosen to be the velocity feedback for controller according to the characteristics of CMGs gimbal velocity command. All of the numerical simulation results validate the theory analysis.
Mechanical Behavior of Fracture Filled with Variable Medium
Authors: Chen Jin Gang , Chen Na , Yang Jun Li
Published: February 2012

Filled fracture is a fracture in which sands or other materials occupy some void spaces. This study uses well-controlled laboratory experiments to investigate mechanical behavior of fracture filled with variable medium by means of normal compression and lateral restraint. A large number of stress-strain data are obtained. The mechanical behavior of filled fracture with variable medium can be divided into three phases: rheological phase, compaction phase and linear elastic phase. At the beginning of the experiment, the filled fracture is in the ideal plastic flow state. The overall strength of filled fracture increase with finite deformation and normal stress increasing, and show linear elastic characters. Based on the experiment results and characteristics, the mechanical behavior model of fracture filled with variable medium is constructed, and also its mechanism is analyzed.
Numerical Study on the Delamination Onset in Drilling Composite Materials
Authors: Sun Shi Yong , Yan Zi Bin , Yang Rui
Published: February 2012

The theoretical analysis and numerical study focused on the delamination onset of composites in drilling are presented. An analytical model considering the form of loads distribution is built. The formulas based on the fracture mechanics theory are given for predicting the critical drilling force of delamination onset. A finite element model is used to simulate the process of interfacial crack growth between layers. The interface elements are employed to account for delamination based on cohesive zone model. Some numerical results are given for verifying the validity of the distribution loading model and discussing the delamination onset and growth in drilling composites.
Analysis of Dynamic Responses of Pipe Vibration in Chemical Ship
Authors: Shi Xiao Min , Ni Hai Zhou
Published: February 2012

Abstract. Above all, it is discussed about vibration mechanism of the pipe system in a chemical ship, according to layout feature of pipes, the finite element model of the pipe system is constructed by means of CAESARⅡ software, through analyzing internal characteristics of pipes, exciting force and valves of dynamic responses are deduced, displacement responses are tested after the pipe system is applied by exciting force, damping projects of pipes are put forward to after measuring results are compared with calculation results.
Numerical Simulation Life Prediction of Alu- Alloy Die -Casting Dies
Authors: Han Xiong Wei , Chen De Ping
Published: February 2012

Abstract: The die casting technology has more wide application in the production of a variety of small appliances and cooking utensils. However, it is difficult to set casting technology parameters, and the life of casting die is short. In this study, the numerical simulation software was employed to simulate the aluminum mold. By analyzing temperature field, the temperature changes of the mould surface were predicted in the die-casting cycle. According to the thermal stress simulation and mathematic model, the thermal stress and strain variations were presented in the process of casting, The thermal stress changes of A, B point on the mold surface were compared under the different pouring temperature, die preheat temperature and cooling water temperature. On the basis of the simulation results, the best die casting technology parameters were selected. The life of die casting dies is predicted by mathematical model, and the simulation results agree well with the result of experiment. This study reached the conclusion is that the die life prediction method is reliable.
Design and Fabrication of the Superabrasive Grinding Wheel with Phyllotactic Pattern
Authors: Lu Yu Shan , Zhao Cheng Yi , Wang Jun , He Yan , Kou Zhi Hui
Published: February 2012

In order to achieve the controllability of the abrasive arrangement on the working surface of grinding wheel,a new kind of the superabrasive grinding wheel, which has defined abrasive grain cluster pattern, has been designed based on the phyllotaxis theory of biology, and fabricated with UV lithography method and electroplating technology. The analytical results indicate that the phyllotactic parameters influence on the abrasive arrangement configuration on the work surface of the superabrasive grinding wheel, so as to improve grinding performance of the grinding wheel, increasing the diameter of phyllotactic abrasive grain cluster and decreasing phyllotactic coefficient can increases the abrasive grain density of the surperabrasive grinding wheel surface. Electroplating experimental results show that the reasonable electroplating processes can reduce the faults of defined abrasive arrangement on the superabrasive grinding wheel surface.
Influence of the Key Factors on the Wall Slip Phenomenon in Micro Flow
Authors: He Pei Qian , Lou Yan , Wu Xiao Yu
Published: February 2012

Aimed at the wall slip phenomenon of micro flow, the wall slip boundary condition was added to simulate the process of the micro flow by Polyflow based on the traditional flow analysis method. The effect of the wall slip on the micro flow was verified by comparing the pressure difference data obtained from the simulation with the quoted test data. In addition, based on the Generalized Navier’s slip law, the shear stress and slip coefficient were researched by the numerical simulation analyses to find out the influence of the key factors on the phenomenon of wall slip. The results show that the phenomenon of wall slip is an important factor that cannot be ignored in the micro flow. And only under the high shear stress, the wall slip phenomenon will have an obvious influence on the micro flow. Along with the decrease of the slip coefficient, the wall slip phenomenon becomes more apparent and the micro flow tends to be stable.
Investigation on Laser Etch-Machining Underwater Based on Thermal-Mechanical Effect
Authors: Mao Wei Ping , Zhang Zhao Yang , Wang Yao Min , Li Zhong Yang , Qi Chang Liang , Yin Jie
Published: February 2012

The method of high-energy short pulse laser etching underwater based on thermal - mechanical effect was put forward. In the experiment system with mask and salt solution , heat affected zone was visible decrease and the image of mask was micro-copied at the workpiece surface. Owing to the photochemical reaction and thermal-mechanical coupling effect, uniform line width of 120μm can be obtained.
Multi-Resolution Analysis of Critical Dimension Line Edge Roughness
Authors: Yang Yan Zhu , Zhu Wei , Li Hong Bo , Zhao Xue Tao
Published: February 2012

A representation method for line edge roughness (LER) parameters based on wavelet-analysis is proposed. Multi-resolution analysis is processed on both spatial features and frequency features of line edge. Different feature details are achieved with different analysis resolution. The features of line edge are able to be represented well by wavelet analysis. And an extraction method for contour line of LER is designed based on wavelet baseline. The experimental results show that more details of LER features are obtained by multi-resolution wavelet analysis. The method is feasible to estimate the nano-scale LER. Therefore, it is possible to reduce the processing errors of nano-scale manufacturing line.
The Surface Absorption Coefficient of S304L Stainless Steel by Nd:YAG Micro-Pulse Laser
Authors: Kuang Jao Hwa , Hung Tsung Pin , Lai Kuen , Hsu Chao Ming , Lin Ah Der
Published: February 2012

The surface absorption coefficient of S304L stainless steel during Nd:YAG pulse laser welding process was derived by using the inverse engineering technique. The thermal-elastic-plastic finite element method is employed to calculate the temperature distribution, melting pool depth and shape with specific heat source. The derived melting pool depths and diameters with different values of absorption coefficient were compared with experimental results. In this study, the least square error method is used to obtain the equivalent absorption coefficient. The results show that the equivalent absorption coefficient of S304L stainless steel is in the range of 0.1~0.25 for low power intensity Nd:YAG impulse laser welding.
An Assessment of Cutting Force for Dental Implant Drilling
Authors: Hwang Joon , Chung Eui Sik , Lee Yong Kyu
Published: February 2012

Bone drilling is widely used in orthopedics and dental surgery; it is a technically surgical procedure. Recent technological improvements in this area are focused on efforts to reduce forces in bone drilling. The aim of this study was to compare changes in cutting force during dental bone drilling at various drilling conditions and drill tool geometry. In the present in vitro study, dog jaw bone with uniform thickness of cortical bone was used. Cutting force changes were measured during drilling process. Drill jig was designed and manufactured to fix jaw workpiece and mounted on the tool dynamometer to measure cutting force in drilling process. The dental implant drilling tests were conducted at various cutting speeds and feed rates. In this study drilling thrust force was observed 1.5~3.6[N] for MS type implant drilling and 3.1~4.9[N] for conventional high speed steel drilling, respectively. This further research will provide a basic quantitative approach for the timely issue of wide application of implant drilling in dental and orthopedic surgery fields.
Design of Autonomic Logistics Information System Based on System Integration Model
Authors: Sun Wan Guo , Ye Hong Bing , Wang Kai , Song Yong Jun
Published: February 2012

In view of some shortcomings of equipment maintenance, Autonomic Logistics Information System (ALIS) technology is introduced. Aiming at common equipment, basing on the description of function requirement definition, system requirements are analyzed firstly. Then developing process is described, the modeling process of developing ALIS is discussed. At last, the structure of ALIS is constructed. And its function module is designed as well. The system includes four layers as information layer, service layer, application layer, and cross-layer. The investigation and discussion on establishing methods of ALIS is completed.
Analysis on the Influence of the Re-Circulation Mechanism’s Position on the Friction Torque Fluctuation in Ball Screw
Authors: Kang Xian Min , Fu Wei Ping , Wang Da Cheng , Wang Jian Sheng
Published: February 2012

When a re-circulating mechanism is in different position, the force exerted on a ball that is into and out of the re-circulating mechanism is different, on which a model of friction torque fluctuation at different position is set up. The friction torque fluctuation varying with the different rotation rate of a ball screw is discussed. The analysis shows that a critical rate exists at different position and a critical preload is likely to occur. The tendency of a friction torque fluctuation is same while the critical rate is different. In the end, the result is verified by experiment.
Visual Monitoring System of Steel-Cord Conveyor Belt
Authors: Fu Li Qin , Wu Xin Jie
Published: February 2012

Safe operation of transport system depends on right examination of their technical conditions and right operating measures thereof. The conventional methods based on magnetic test for steel-cord conveyor belt inspection have many limitations. So a new detection method which is based on both magnetic method and X-ray digital imaging technology is used. This paper introduces the key techniques and control scheme of the detection system. Five main steps, including self-diagnosis, hardware test, magnetic inspection, radiographic inspection and diagnosis, are discussed in detail. The system provides a preventive maintenance program which can achieve high precision for it uses image analysis techniques to process digital radiography images to identify gravity of defects.
Study on Electrophoretic Deposition Characteristics of Ultra-Fine Diamond Powder
Authors: Mao Xian Yan , Lu Jing , Guo Hua
Published: February 2012

Diamond is a promising material especially applied in advanced machining tools, wear-resistant coatings, and the EPD technique should provide a simple method to develop hard coatings for precision machining tools or wear-resistant parts. Therefore, it is useful to research electrophoretic deposition characteristics of diamond powder itself, including the impact of adding ions on direction of EPD especially. In this paper, the effects of suspension concentration and applied voltage, deposition time, and added Ca2+ or Al3+ ions on electrophoretic characteristics of ultra-fine diamond powder were discussed, and electrophoretic deposition (EPD) parameters were optimized by a trial-and-error approach. The results show that smooth, uniform and dense coatings of diamond were obtained under suspension concentration of 1%-1.5% and applied voltage of 30-70 V. The thickness of diamond coating can be controlled by adjusting deposition time under constant voltage and suspension concentration. If deposition direction changed, the appropriate concentration of added Ca2 + and Al3 +, respectively, is in the range of 0.005% to 0.01% and 0.05% to 0.10%.
Tribological Characteristics of Nanostructrued Ceramic Coatings Deposited by Plasma Spraying
Authors: Liu Wen Kai , Ma Wei Ping , Lu Xue Cheng
Published: February 2012

Nanostructured Al2O3-13wt.% TiO2 coatings were prepared by plasma spraying using agglomerated nanocrystalline powders via a spray drying method. The as-sprayed coatings and their worn surface were characterized using scanning electron microscope (SEM). The tribological characteristics were evaluated on block-on-ring configuration. It is found that that the nanostructured coating exhibited a unique bimodal microstructure, which has an important influence on the tribological characteristics. The abrasive wear resistance of the nanocoatings are greatly improved compared with the conventional coatings, and the abrasive wear mechanism is also discussed.
Influence Analysis of Coupled Neutronics and Thermo-Hydraulics on Steady-State Characteristics of Supercritical Water-Cooled Reactor
Authors: Chen Juan , Zhou Tao , Hou Zhou Sen , Cheng Wan Xu , Sun Can Hui
Published: February 2012

the coulped neutronics and thermo-hydraulics model for supercritical water-cooled reactor (SCWR) is developed by internal coupling method. It is based on the two group neutron diffusion equations and the one-dimensional junction thermal analysis mode, in which the cross sections used for SCWR are generated by Dragon tool. Compared with the calculation results based on the non-coupling calculation model, the steady state characteristics under coupling calculation condition are detailed analyzed by considering parameters feedback at each axial node. The results show that, as coupled model is chosen its axial power distribution would give an obvious deviation from the cosine function that used for non-coupled model. Although the cladding temperature at most of the axial nodes rises with a shifted power peak, the maximum cladding temperature is finally decreased. For the above coupling condition, the maximum cladding temperature would appear at the external assemblies with lower coolant temperature but not at inner assemblies with higher coolant temperature. As the detailed description for coupling characteristics of supercritical water-cooled reactor is given, a certain theory reference for its system safety could be provided.
Tribological Performances of Active Screen Ion Sulphurized Layer under Epinoc Grease Lubricating
Authors: Hu Chun Hua , Jiang Feng , Zheng Zhen Duo , Cao Jun , Qiao Yu Lin , Sun Xiao Feng
Published: February 2012

The active screen ion sulphurized layer was prepared on the surface of CrMoCu alloy cast iron by using active screen ion sulphurizing technology. Its key composition is FeS. Under epinoc grease lubrication condition, the friction factor and the wear volume of the active screen ion sulphurized layer is 24% and 40% lower than that of the plain surface and close to that of the sulphurized layer, respectively. The active screen ion sulphurized layer has excellent self-lubrication property, and its loose and porous structure tending to store the grease, which make it possess excellent friction reduction and wear resistance performances.
The Structure Design and Dynamic Characteristic Simulation Analysis of Electric Spindle Using the PC Grinder of Ceramic Ferrule
Authors: He Run Qin
Published: February 2012

The PC grinder of ceramic ferrule is the core part of the processing of Optical—fiber Connector. Through the processing equipment, in order to ensuring the product spherical curvature radius is SR14-18mm, eccentric ≤30 µm, surface roughness of less than 0.01 µm. In grinding process for high rotating speed and high precision machining, here used a motorized spindle technology. High speed spindle is widely applied in high speed grinder whit its advantages of light weight, high speed, compact structure, small inertia, good dynamic characteristics and so on.
Research on the Carbides of Its Alloying Layer Conducted by W-Mo-Y Surface Alloying and Carburizing Process
Authors: Cai Hang Wei , Wu Hong Guan , Ma Zhi Kang , Wang Cheng Lei , Yuan Lin , Zhang Wei , Li Bing , Gao Yuan
Published: February 2012

Q235 steel was processed by solid carburizing and quenching after conducted by W-Mo-Y double glow-discharge plasma surface alloying process. Finally carbon contents, the morphologies and phases of the samples' surface were analyzed. The results show as follows: Carbon contents of the samples' surface are 1.28 wt%, 1.36 wt%, 1.51 wt% respectively after W-Mo-Y alloying layer (also called co-penetrated layer) was processed by solid carburizing at 960 °C, 980 °C, 1020 °C respectively; The amount of the carbides in W-Mo-Y alloying layer is obviously more than that of the carbides in W-Mo alloying layer; The granular carbides distribute dispersively and uniformly in alloying layer, and the sizes of carbide particle are less than 1 μm; There is no eutectic carbide at the grain boundaries; With temperatures of carburizing and quenching process rising, the carbides increases in number; After W-Mo-Y alloying layer was carburized and quenched at 1020 °C, the phases of alloying layer are Fe2C, W2C, Fe2MoC, MoC, Fe3C, Mo2C and Y2C3; and the types of their carbides are M3C, M2C, and MC, which are different from the types of W-Mo carbides in general metallurgy high-speed steel (HSS). It can be seen from the available, the morphologies, the sizes and the amount of surface HSS's carbides can be adjusted by heat treatment.
Study on the Thermal Errors of CNC Machine Tools
Authors: Luo Hong Qi , Lai Yue Hua
Published: February 2012

Thermal deformation is produced by heat sources in CNC machine tools. Thermal error is one of the main parts in CNC machining errors. The internal and external heat sources were introduced. The research status about thermal errors was analyzed, including identification of thermal sensitive points, precaution against thermal errors and error compensation. Finally, thermal error models were summarized and discussed.
The Fatigue Life of Plan Coil Spring Forecasts Based on Potential Boundary Element
Authors: Tian Jin Yue , Nie Fa Yong , Chen Li Dong
Published: February 2012

The stress distribution of structure in plan coil spring usually is three dimensional. The singularities of Cauchy principal integral and logarithmic integral during calculating the elements of the coefficient matrix are studied respectively so that the singularity of Cauchy integral is eliminated in this paper, which is based on boundary integral equation in axisymmetric potential problem. Moreover, the order of singularity in logarithmic integral is reduced. Comparison between the results deduced here and the analytical solutions shows that the present derivation is correct and the algorithm is efficient as well.
Anodic Behavior of Copper in 1-Hydroxyethylene-1, 1-Diphosphonic Acid (HEDPA) Baths
Authors: Zheng Jing Wu , Zheng Biao , Ying Yao , Qiao Liang , Jiang Li Qiang , Zhang Cheng
Published: February 2012

The electrochemical behavior of anodic dissolution of copper electrode was investigated in non-cyanide alkaline electrolyte containing 1-hydroxyethylene-1, 1-diphosphonic acid (HEDPA) as a complexing agent. Electrochemical behavior of copper electrode was studied by cyclic voltammetry. X-ray photoelectron spectroscopy was used to study morphologies of copper electrode after dissolution under different potentials. The results showed that in cyclic voltammetry curve of the 1-hydroxyethylene-1,1-diphosphonic Acid(HEDPA) baths, the first peak of copper anode was diffusion-controlled, associated with the formation of Cu2O. The second oxidation peak came from generating CuO and the third peak was the formation of CuO/Cu(OH)2 compound.
Process Study on Prepared Al2O3-TiB2 Composite Coating by Reactive Spray
Authors: Zhou Xiao Ping , Li Ming , Zhou Xin
Published: February 2012

The microstructures and properties of Al2O3-TiB2 composite coating on the surface of the aluminum alloy by reactive spraying was studied. The influences of mechanical alloying and spraying temperature on the phase constituent and microstructure of the composite were analyzed by X-ray diffractometry(XRD) and scanning electron microscopy(SEM). The results indicate that Al2O3-TiB2 composite coating is obtained by plasma spraying using milled powder of Al，TiO2，B2O and B2O3. The coating possesses high microhardness of 1300 HV0.1.
Influence Analysis of Linear Data Distribution on Different Clustering Results
Authors: Song Yu Chen , Jia Xiao Liang , Meng Hai Dong
Published: February 2012

Through simulating kinds of practical data distribution forms, we could construct different linear data distribution based on three-dimensional space. According to the widely applicable clustering methods based on traditional methods classification, we could compare and analysis of different clustering results on kinds of linear distribution data. Firstly, we could conduct the clustering experiments of simple linear distribution data; secondly, according to the experience above, we could conduct the clustering experiments of complex linear distribution data. At the same time, combining mature computer visualization technology of displaying clustering results with the widely applicable evaluation index of interpretative statement, we could come to the conclusion that relevant influences of linear data distribution on clustering results of different clustering methods, proposing more optimized clustering analysis process on different linear data distributions.
Space Properties of Effects of Slope Stability by Underground Mining
Authors: Sun Shi Guo , Dong Pei Xin
Published: February 2012

At present, technology for open pit combined underground mining is one problem about mine. It mainly involves some problems, such as how to design deep resources exploitation, how to evaluation slope stability and so on. Combining the underground mining effect with their characteristics and function attributes influenced by the slope deformation, this paper considers the both composite superimposed law, and derives the calculation method of the slope stability under comprehensive function. Accordingly, explore the influence law of slope stability, induced by underground mining area and the relative position and the space and geometry size changes of slope body. And the final purpose is to provide the scientific basis for design and safety assessment of deep resource extraction.
Research of Stochastic Control on Aviation Supplies Inventory
Authors: Wei Guo , Zhao Shi Wei , Qu Wen Fang
Published: February 2012

In this paper, the aviation supplies inventory in maintenance process is taken as the study subject. Based on reasonable hypothesis, aviation supplies consuming process in a fixed period is regarded as stochastic process, and inventory process and inventory control system model are built. Take tire inventory as an example and then the model parameters have been identified. On this basis, aviation supplies inventory control system is designed by means of stochastic control theory, which could optimize inventory quantity. Finally, simulate inventory control process by MATLAB simulation software. The results show that inventory variance and average inventory quantity decrease, which can significantly reduce the stock fund and maintenance cost.
The Impact of Manufacturing Firms’ Green Supply Chain Management on Competitive Advantage
Authors: Liu Li , Tang Min , Xue Fan
Published: February 2012

This paper, based on a survey of manufacturing firms in south and central China regions, examines the relationship among green supply chain management, competitive advantage and firm performance. By factor analyses, the scale of manufacturing firm’s green supply chain management is obtained. The results show that green supply chain management can be conceptualized as a four dimensional variable: green manufacturing, green purchasing, green distribution and green logistics. Furthermore, after testing research hypotheses by LISREL, we find that these four constructs all have significant effects on competitive advantage, and that green manufacturing and green logistics have significant effects on firm performance. The implications for our findings are also presented.
Study on Green Supply Chain of Chinese TV Industry under Circular Economy
Authors: Zheng Ji Liang , Zhou Fei , Qi Zhen Jiang
Published: February 2012

Under the background of considering ecological balance, environmental protection and energy saving, how to boost the sustainable development of enterprises has become the common problem that TV industry needs to solve urgently. Therefore, this article considers the necessity of implementing green supply chain development model in Chinese TV industry, and gives the framework under the thought of circular economy. It also deeply analyzes the circular economy construction of each part of the framework, and puts forward some countermeasures of implementing green supply chain management in Chinese TV industry.