bluuebunny/crossref_metadata_2025 huggingface dataset:
Stress Analysis and Life Estimation of Drawing Die with Bi-Materials
Authors: Zheng Zhong , Zhang Hai Ou , Wang Gui Lan
Published: November 2010

In this article, a drawing die is researched in order to obtain the dynamic load and stress distributions and determine the potential fatigue location in it. The stress fields of the drawing die in the drawing process and their changing rules were studied through finite element method. The dynamic simulation of stress changing state has been realized, and the potential fatigue locations in the die were also determined. Based on the conclusion, the cavity die was divided into the substrate part and the wear-resistant part according to the stress distribution. Fatigue life estimations were made on the homogeneous die and the die with bi-materials. The example showed that bi-materials design can increase the service life while greatly reduces the cost of die material. The conclusions drawn conform to reality and have realistic significance.
Experimental and Theoretical Study on Properties of the Fayalite Mineral in Coal Ash
Authors: Du Mei Fang , Lu Gui Lin , Zhou Tuo , Hou Ning Pu , Zhang Zhong Xiao , Wu Gao He , Zhang Ying
Published: November 2010

This papers deals with the study of the fayalite with high content of iron in the initial layer of coal ash, using the generalized gradient approximation and Perdew-Wang91 algorithm based on the Quantum chemistry. By calculating, we found that the gap between the highest occupied molecular orbital(HOMO) energy and the lowest unoccupied molecular orbital(LUMO) energy of the Fayalite is very small, so the structure is unstable. Thus show that the water-cooling wall slagging more active due to Fe atoms,prone to transformations of physical phenomena.
Catalytic Activity of Ba Doped Ta2O5 for Methylene Blue Degradation under Visible Light
Authors: Zhao Yan Hong , Sun Min , Wang Shu Wei , Tong Wen Ming , Wang Xiao Jing
Published: November 2010

The Ba doped tantalum oxide (Ba-Ta2O5) particles were synthesized using low temperature hydrothermal method. The phase structure of samples was characterized by X-ray diffraction (XRD). The result showed that Ba-Ta2O5 had still good crystallinity and belonged to rhombic crystal. The catalytic activity of samples was investigated with the degradation methylene blue (MB) under visible light. The degradation efficiency attained 82% when the reaction time was 12 h. The kinetics of MB degradation was respect to the first-order.
On Improvements of Rubberized Concrete with Organosulfur Compounds
Authors: Chou Liang Hsiung
Published: November 2010

Crumb rubbers have been investigated as additives to concrete and promising results have been observed. Organosulfur compounds from a petroleum-refining factory were used to modify the surface properties of crumb rubbers. The intermolecular interaction forces between cement hydration products (C-S-H) and rubber crumbs were measured directly by an atomic force microscope (AFM) equipped with a colloid probe. Experimental data indicate that crumb rubber surface is more hydrophilic after the treatment with organosulfur compounds and the intermolecular interaction forces between C-S-H and rubber increase with the treatment of crumb rubbers with organosulfur compounds. Furthermore, these increased interaction forces lead to an increased concrete strength.
Research on the Load Distribution of Throwing Ends in Vertical Shaft Impact Crusher
Authors: Zhao Fang , Zhang Jun Ming , Wang Wei , Duan De Rong
Published: November 2010

With ADAMS dynamics software to simulate the stone movement in the vertical shaft impact crusher rotor, the law of an impact frequency and load on the throwing ends with the variation of feed size and rotor speed is studied, the reasons that the middle throwing end is most vulnerable to wear failure and the rotor speed is not as high as possible are explained.
The Mössbauer Spectrum Research of the Lanthanon Compound R3Fe29-xCrX
Authors: Liu Hong Li , Guo Min
Published: November 2010

We have systemically investigated mössbauer spectrum of R3Fe29-xCrx (R=Y, Gd, Tb, Dy) compound. Isomer shift、Quadrupole split and Hyperfine field at room temperature are studied. We know that the electronics transfer occurs between R and Fe atoms in the R3Fe29-xCrx compound.
Numerical Simulation Studies on Tension Behavior of Casing and Dowel Joint of Square Steel Tube
Authors: Ding Min , Hou Zhen Hua , Jiang Xiu Gen , Lin Zi Chen , Zhang Guang Kui , Ju Jin San
Published: November 2010

The study on tension behavior of casing and dowel joint of square steel tube was carried out by using finite element analysis software ANSYS/LS-DYNA with consideration of geometric nonlinearity, material nonlinearity and contact nonlinearity. On this basis, the effects of inside tube wall thickness, main tube wall thickness, and inserting depth on failure mode, ultimate tensile load and deformation of casing and dowel joint of square steel tube was discussed. The results show that there are three types of failure modes, i.e., bolt failure, inside tube failure and main tube failure, when the joints are subjected to axial tension force. Compare to the joint with the same wall thickness of inside tube and main tube, the reduction of wall thickness of inside tube or main tube will weaken greatly the ultimate tensile load of the joint. The ultimate tensile load of casing and dowel joints is proportional to bolt shear strength, tube wall thickness, inserting depth, and tube edge length. The fruits are useful to the design and application of casing and dowel joints of square steel tube.
Numerical Simulation of Heat Transfer Characteristics for Two Metallic TPS Structures
Authors: Liu Hai Yong , Qiang Hong Fu
Published: November 2010

Two structures of metallic thermal protection system(TPS) for hypersonic vehicle were presented. One model was a multi-layer construction and the other has cavities in the metallic layer. Numerical simulations were conducted on the three-dimensional TPS models using CFD software of Gambit and Fluent. Two heating temperatures of 1073K and 773K with constant temperature and isothermal boundary conditions were considered. Heat transfer was treated as single conductivity and thermal radiation effect was not involved. The results of simulation investigation showed that: The metallic layer had poor capability to restrict the heat conductivity. Heat was easier to transfer across the bracket into the internal part of the TPS. The ability of cavities in metallic layer to resist heat conductivity was limited. The temperature-heating time variation pattern was similar for different external heating temperature. Internal cooling was important for the TPS. The thermal radiation effect on the TPS would be focused in further research.
Prediction of Life on High Temperature & Low Cycle Fatigue for 3-Dimension Structure
Authors: Zhang Wen Xiao , Gao Guo Dong , Mu Guang Yu
Published: November 2010

The high temperature & low cycle fatigue were experimentally studied with the 3-dimension notched 2.25Cr—1Mo steel specimens. The 3-dimension stress-strain responses of specimens were calculated by means of the program ADINA. The prediction method of 3-dimension fatigue life was discussed according to the theory of high temperature strength. The results of experiments and calculations showed that the equivalent strain range can be served as the valid mechanics for predicting fatigue life.
Natural Frequency Computation Method of Nonlocal Elastic Beam
Authors: Shen Xiao Long , Luo Yong Xin , Zhang Lai Xi , Long Hua
Published: November 2010

After adopting the constitutive equations of the nonlocal elastic media in the form of Eringen, and making use of the Laplace transformation, the vibration governing equation of nonlocal elastic beam in the Kelvin media are established. Unlike classical elastic models, the stress of a point in a nonlocal model is obtained as a weighted average of the field over the spatial domain, determined by a kernel function based on distance measures. The motion equation of nonlocal elastic beam is an integral differential equation, rather than the differential equation obtained with a classical local model. Solutions for natural frequencies and modes are obtained. Numerical examples demonstrate the efficiency of the proposed method for the beam with simple boundary conditions.
Glass-Mold Defective Reduction in Plastic Lenses Manufacturing Process Using Six Sigma Approach
Authors: Rojanarowan Napassavong , Senprom Teeraporn
Published: November 2010

This research aims to demonstrate Six Sigma methodology to reduce defective rate. A case of glass-mold defective reduction in plastic lenses manufacturing was studied. After applying systematic DMAIC steps and statistical tools suggested by Six Sigma approach, it was observed that the defective rate due to scratched molds was decreased from 2,512 ppm to 826 ppm, and the sigma level was improved from 4.31 to 4.65. In addition, the improvement could save the production cost up to 75,000 USD annually.
Experimental Investigation and Improvement of Dynamic Performance of High-Speed Grinding Machine
Authors: Shen Xiao Long , Ren Cheng Gao , Pi Zhi Mou , Zhu Dai Li
Published: November 2010

Design of the dynamic performance of a machine tool is an effective approach to improve the machining accuracy. In this paper, the dynamic performance of high-speed cylindrical grinder has been studied systematically to improve the surface quality of high-speed grinding. According to the mode shape graphs and the power spectra, the vibration weak links and the main vibration sources of the prototype were found, and then the improvement measures were presented by designing the dynamic performance tests. The fact that the chatter of high-speed grinding can be suppressed to a certain extent with variable speed grindings was verified in variable speed grinding experiments at high speed.
The Optimal Allocation of Manufacturing Resources Capabilities in Workshop Based on AFSA
Authors: Wang Zhi Guo
Published: November 2010

A kind of approach to solve the workshop production capability optimization allocation problem is put forward in this paper. The approach is based on the artificial fish-swarm algorithm (AFSA). In the approach, the normal artificial fish is extended to be two-dimension artificial fish. In the two-dimension artificial fish, each vector could be expressed with a group of tasks. By designing the behavior of two dimensions, the production capability allocation approach based on two dimension artificial swarm algorithm is put forward, which demonstrates the efficiency of the algorithm in handling with complex mathematical problems as well as non-convex production capability resource management problems. The application case study shows that the AFSA is not complicated to use and does not require much mathematical sophistication to understand its mechanisms. The approach can be considered as an optimal tool to provide production capability optimization allocation.
Rapid Manufacturing and Remanufacturing System Based on Robotic GMAW
Authors: Yin Zi Qiang , Zhang Guang Jun , Zhao Hui Hui , Wu Lin
Published: November 2010

This paper describes a novel rapid manufacturing and remanufacturing system based on robotic gas metal arc welding. If worn parts are maintainable, this system play a repairer role; if worn parts are unfit to remain in service, this system play a manufacturer role. This system works in ‘modeling - slicing - stacking’ principle. First, Detecting and building three-dimensional models of damaged zone by structured light. Second, Slicing established three-dimensional model in layers with some thickness. Third, planning robotic tool path to get optimumwelding path and parameters. Finally, executing remanufacturing task with robotic GMAW stacking layer by layer. This system remanufactures parts in human - robot interactive way. Take a half cylinder shell as worn part, experiments are conducted. Results show the mean error of surface smoothness is less than 0.5mm.
Optimal Desigh of Self-Sealing Low Friction and Non-Leakage Plunger Pump
Authors: Han Xiu Ting , Li Xiao Dong , Wang Yan Lou , Zhang Chuan Xu , Li Jun Liang , Sun Xian Jie , Xu Jin Chao
Published: November 2010

A new type of wear-resistant hydraulic feedback self-sealing plunger pump is proposed. finite element analysis and optimal design of orthogonal parameters are applied to determine the structural parameters. The pump overcomes the conventional piston friction, low efficiency, short life. Laboratory tests showed that the pump free down stroke, full returns, leakage reduction 1,000 times than the standard API. Field experiments indicate that pump efficiency attain to 60-80%, achieved a good energy saving effect of improving the pump efficiency.
An Investigation into the Fracture Mechanical Behavior of Bone Cement: Simulation Using Cohesive Zone Models (CZMs)
Authors: Huang Xiao Hui , Liu Wen Guang , Zhao Guo Qun , Zhao Xin Hai
Published: November 2010

In this investigation, we propose a new concept to embed cohesive zone into the continuum structure of bone cement, an example of brittle material, in investigating the mechanical behavior and fracture mechanism and to predict the fracture which elastic fracture mechanics (EFM) is unable to. Four finite element (FE) models with embedded cohesive zones for the simulations of tensile, compression, double shear and 3-point bending tests have been implemented. Cohesive zones (CZ) are embedded at high risks of fracture with orientations determined by fracture mode. A bilinear cohesive traction-separation law (TSL) is applied. The fracture parameters in traction-separation curve are validated and justified in the simulations to agree well with the force-displacement curves in the four practical tests. Apart from the maximum load, the perpetual safe working load (SWL) in theory also can be predicted by tracing the history of the stiffness degradation of fractured cohesive zone by means of simulation. A distinct advantage of our numerical model is that it is able to extend to investigate the mechanical behavior and fracture mechanism of other brittle materials. The proposed method with embedded cohesive zones in FE models can be introduced to predict the fracture and to forecast the maximum load and safe working load (SWL) of the continuum structure in more complicated loading conditions.
N-Doped TiO2 Nanotubes and its Photocatalytic Activity under UV Light
Authors: Dou Yan Wei , Feng Xue , Yin Chao
Published: November 2010

We review the fabrication and properties of highly ordered TiO2 nanotube arrays made by anodic oxidation of titanium in fluoride-based electrolytes. The N-doped TiO2 nanotubes were prepared by changing the composition of electrolyte. TiO2 nanotubes and N-doped TiO2 nanotubes characterized by various analytical methods, such as scanning electron microscope (SEM) and X-ray photoelectron emission spectroscopy (XPS). The photocatalytic efficiency was evaluated by the photodegradation of Methyl orange solution under UV irradiation. It has been confirmed that the recombination rate of electron-hole pairs declined significantly. The higher visible light activity is due to the codoping of nitrogen.
Effects of Multi-Disciplinary and Intercultural Engineering Education in Automotive Engineering/Service at CDHAW of Tongji University
Authors: Mao Yan Fen , Chen Ming , Wiedmann Hans , Feng Xiao
Published: November 2010

This paper examined the requirements of economy, industry and society for the education of engineers in the field of automotive engineering/service (AES). It introduced a novel engineering education model and investigates the effects at its implementation in a Sino-German educational research project in Tongji University. From three main requirements for engineers in automotive industry, it discussed the orientation and features of AES which focus on application-oriented, multi-disciplinary, and intercultural education. The objective of AES is to educate competent engineers meeting industrial requirements and acquiring a double degree as Bachelor of Science at CDHAW and as Bachelor of Engineering at the German partner universities of applied sciences. To guarantee the quality of bachelor-level engineers on knowledge, know-how, engineering competence and soft skills, this education model integrated a useful operation conception from curriculum design, bilingualism, multi-disciplinary and application-oriented education, education structure, and other resources of teaching and combined them into a system. Out of the education model we derived the effects for students, university staffs, and related companies, and the challenges from the implementation at the Sino-German College of Applied Sciences (Chinesisch-Deutsche Hochschule für Angewandte Wissenschaften, for short CDHAW in German language) of Tongji University. The education model and its positive effects can be successfully used for reference to international engineering education reform and practice.
Research Foundation of Rock-Burst Hazard Control for Mining Pattern with No Pillar
Authors: Wen Zhi Jie , Chen Lian Jun , Zhao Xiao Dong , Zhang Chuan
Published: November 2010

In order to effectively prevent the rock burst occurrence for mining patter with no pillar, the reason and its realization condition of rock burst were studied; the stope structure mechanics model with working face mining was built; four phases of rock burst occurrence with mining were proposed; the relationship between rock burst occurrence and abutment pressure law of development was analyzed, time-space coupling relationship of rock burst and its relevant information for rock burst control were obtained.
3-D Interactive Simulation of Magnetic Compass Adjustment Based on VRML
Authors: Wu Jian Hua , Li Hao , Li Hong Xiang
Published: November 2010

Magnetic compass adjustment is an indispensable work during ship operation, and its procedure can not be simulated in a real ship by traditional teaching methods, which has become a bottleneck to magnetic compass learners. The procedure of magnetic compass adjustment is simulated by virtual reality modeling language(VRML). Three-dimensional interactive demonstrations of magnetic compass’ structure and adjustment procedure are implemented. So learners will have a direct cognition to the adjustment procedure of heeling deviation, semicircular deviation and quadrantal deviation. The realization process of simulation in the virtual reality environment is described in detail and the relevant source codes are given.
Adsorption of Congo Red Dye onto Raw and Chitosan-Modified Bentonite
Authors: Li Shan Ping , Cui Jiang Jie
Published: November 2010

We studied the effects of surface modification of bentonite with chitosan on its ability to adsorb Congo Red (CR) dye. The adsorption behavior of CR from aqueous solution onto raw (RB) and chitosan-modified (CMB) bentonite samples was investigated as a function of parameters such as initial CR concentration, contact time, pH and temperature. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were used to confirm the surface modification. Compared with RB, the adsorption capacity of CMB for CR was greatly enhanced. Kinetic studies indicated that the adsorption of CR on both RB and CMB followed the pseudo-second-order kinetic model. From the thermodynamic parameters, the adsorption of CR on RB and CMB is spontaneous and endothermic. The results indicate that chitosan-modified bentonite provides an important advantage for CR dye adsorption over raw bentonite.
Strengthening the Engineer's Lifelong Education
Authors: Zhang Yan Li , Bai Li Zhu , Zhang Dong
Published: November 2010

. With the rapid development of scientific technology, the current skills and knowledge has become more and more important. Engineering technical personnel need long-life learning to improve them for competitiveness. Therefore, long-life learning should be enhanced in engineering education. This paper explains the meaning of long-life learning, analyzes the reasons long-life learning being enhanced in engineering education, the influence on engineering education and engineering technical. Some suggestions about enhancing long-life learning in engineering education and keeping good habits of long-life learning are also put forward.
The Practicability of Automobile External Flow Simulation Based on the Two-Equation Models
Authors: Li Xiao Shan , Sun Huan Wu , Huang Jin Hua
Published: November 2010

Based on the studies of the Standard, RNG models and SST model, a vehicle external flow field is calculated with three different models. Calculation results are compared with that of experiment. It is found that the error between the simulation results of the drag coefficient of RNS model and the wind tunnel experimental results are minimal. In the near wall region and airflow separation simulations, the simulation results of SST model are more close to the actual condition compared with standard and RNG models.
Effects of Modified Atmosphere Packaging of PE Film with Different Thickness on Quality of Pleurotus nebrodensis
Authors: Li Xi Hong , Li Yuan Yuan , Zhang Li , Wang Xiu Li
Published: November 2010

Taking pleurotus nebrodensis as a test material to research the pleurotus nebrodensis preservation effect with using modified atmosphere packaging of PE with different thickness at 4 , evaluating the quality changing during the storage life. The results showed that 0.05mmPE treatment has the best preservation effect, which could effectively maintain the storage circumstance of low O2 and high CO2 concentration, decreasing the weight loss and postpone the reducing of luminosity L and browning time. Besides, using modified atmosphere packaging of 0.05mmPE can postpone the decline of quality of pleurotus nebrodensis, enhancing the storage quality and prolonging the life of postharvest storage as well.
Removal of Red Acid Dye from Synthetic Wastewater by Adsorption onto Low-Cost Material
Authors: Kulyakorn Khuanmar , Satawat Thoungshone , Pattakamol Somboot
Published: November 2010

Low-cost adsorbent which was burned rice husk was used in this study. The burned rice was tested with a series of packed bed in plastic bottle. The flow rate was controlled at 0.1 ml/s for all the experiment. Thomas model was used to predict the breakthrough time and all experiments were carried out at room temperature. The results indicated that the burned rice husk has a potential to be low-cost adsorbent for removal of red acid dye
Design and Study of PDC Bit for Igneous Rock Formation of Santanghu
Authors: Wei Zhong Liang , Zhang Jian Qun , Li Ji Tai , Xue Ji Biao , Zhang Yong
Published: November 2010

Based on the geological configuration and formation lithology of igneous rock stratum of Santanghu, optimized design methods of PDC (polycrystalline diamond compact) bit are used to design PDC bit crown shape, cutting angle, the distribution of cutters and hydraulic structure, etc. Especially, these methods, which are design methods of gentle crown profile, spiral blade, high-density distribution of cutters, suitable back rake angle, and hydraulic structures which are more flexible nozzles of asymmetric arrangement and deeper fluid course layout, are fit for high hardness, multiple interbed and high abrasiveness of the igneous rock formation. The bit designed in this paper has turned out to be much better in the experiment of Horse 36 well of Santanghu.
Optimization of Surface Roughness by Taguchi Design Method
Authors: Rumman Md Raihanuzzaman , Hong Soon Jik
Published: November 2010

Maintaining good surface quality usually involves additional manufacturing cost or loss of productivity. The Taguchi design is an efficient and effective experimental method in which a response variable can be optimized, given various control and noise factors, using fewer resources than a factorial design. This study included feed rate, spindle speed and depth of cut as control factors, and the noise factors were the operating chamber temperature and the usage of different tool inserts in the same specification. An orthogonal array of L9 (34) was used and the optimal cutting combination was determined by seeking the best surface roughness (response) and signal-to-noise ratio.
Study on Automobile Welding Jig Rapid Design System Based on Parametric Technology
Authors: Sha Zhi Hua , Chen Cui Cui , Zhang Sheng Fang , Liu Zheng , Mao Jun Feng
Published: November 2010

As the core of automotive welding production line, the development speed and quality of automotive welding jig impact on the automobile production cycle and manufacturing precision directly. At present, the traditional design method of automotive welding jig is difficult to adapt to the developing speed of auto body. In order to improve the design efficiency of the welding jig, a rapid automobile welding jig design method based on parametric technology is developed in this paper. Supported by parametric theory, combining with CATIA secondary development approach, the principle and structure of the automobile welding jig rapid design system are presented, and related key technologies in rapid design system developing are studied deeply, and a rapid welding jig parametric design system is developed finally. Taking one station of rear side member for example, the generation process of automotive welding jig is analyzed in detail, and design practice shows: the welding jig designed by this system has shorter development cycle then the traditional method.
Removal of Rhodamine B from Aqueous Solution Using ACF/CNT Composites Prepared by Chemical Vapor Deposition
Authors: Wang Li Ping , Huang Zhu Cheng , Zhang Ming Yu
Published: November 2010

ACF/CNT composites were fabricated with carbon nanotubes (CNTs) growing on the surface of activated carbon fibers (ACFs) by chemical vapor deposition (CVD). The properties of ACF/CNT composites were characterized by scanning electron microscopy and BET surface area measurements. In addition, experiments were carried out to investigate effect of contact time, pH and temperature on ACF/CNT composites adsorption ability for rhodamine B from aqueous solution. The results show removal rate of rhodamine B reaches to 98.99％ at 120 min as initial concentration of rhodamine B is 5 mg/L, pH is 7 and temperature is 50 . Adsorption mechanism of ACF/CNT composites is simply discussed.
The Product Surface Remote Detection Method Based on the Single Laser Pulse Echo
Authors: Zhan Qun , Sheng Nan
Published: November 2010

Laser detecting technology can be utilized to the product surface detection for finding the surface deficiency. However, the improving resolving power of laser detecting system is limited by the laser footprint size on the product surface. Employing only echo delay and intensity information, the information of the surface inside the footprint is difficult to be obtained for the echo signal of the objects maybe is submerged by each other. Under the remote laser detecting, the serious loss of image quality may occur because of the large footprint. The product surface detection method based on the single laser return waveform was studied and the provided to get the objects information inside the laser footprint. Firstly, the basis laser echo signal model of the objects inside the footprint was built. On the basis, the decomposition algorithm was provided which can decompose a laser return waveform into a series of components assuming that each component corresponding to a sub-object inside the laser footprint. After the primary sub-target return waveforms was obtained, however, there still exists some small sub-objects inside the laser footprint whose return signal is hardly to be extracted because they are submerged by the neighborhood sub-objects return signal. The subtracting algorithm between the whole return waveform and the components waveform provides the way to get the submerged return waveforms of sub-target. So, the information of sub-objects inside the laser footprint would be obtained. In the end, the actual laser return data of the product surface was analyzed employing the method to get the range position information of the sub-objects inside the laser footprint, which verifies the method validity.
Formability Window of Tailor Rolled Blanks at Blank-Holder Force
Authors: Jiang Yin Fang , Fang Lei , Li Zhi Fei , Tang Zhen Zhou
Published: November 2010

As a new lightweight material and new technique,Tailor Rolled Blanks has a good prospect in energy-saving environmental protection and the future development of the automobile industry, formability window of Tailor Rolled Blanks at blank-holder force has important practical significance. Based on the research of a square box TRB, the paper proposes a theory of TRB’ formability window, also with the usage of an ABACUS finite element software to simulate the TRB sheet in the course of the critical wrinkling BHF curve and critical fracture BHF curve, to establish TRB formability window under the condition of blank holder force. The results not only show that the square box of TRB has the security zone in the deep drawing process, but also has got the wrinkling and fracture areas of the square box.
Study of the Method on Cutting-Force Modeling Based on the Current of High-Speed Electric Spindles
Authors: Li Song Sheng , Mao Hua Wei , Chen Ping , Huang Xiao , Chen Xiao Yang
Published: November 2010

It is important to build the models for calculating the cutting-forces in high-speed machining, but it is difficult as the special test-bed with the cutting-force measurement system is complicated, cost much and cannot be applied directly on general machining tools. Aiming at the problems above, a new method was put forward about cutting-force modeling based on the current of high-speed electric spindles, in which the cutting-force models could be gained indirectly by analyzing the built-in motor current and the data gotten from cutting experiments on those general machining tools which are installed with electric spindles. Then on a vertical milling machine tool which is equipped with a high-speed electric spindle, a model for calculating the milling force was gotten using the method put forward by this paper. The results show that the method is simple and easy to be used in routine machine tools in plant spots and need no any special test-beds and any complicated measurement systems possessed only in the laboratory conditions.
Structural Line Shape and Stress Analysis in the Construction of Kaziwan Bridge
Authors: Ren Xiang
Published: November 2010

Cantilever installation is a construction method of which is often used in the construction of Concrete Oblique-pulling truss bridge. For ensuring the safety of construction process, the structural line shape and stress under different construction phases of the bridge were tested. Contrastive analysis between the testing results and the calculating results was carried on in different construction phases. The results showed the testing values of vertical displacement is smaller than the calculating values because the actual stiffness of the structure is bigger than the theory stiffness. But the stress of key section’s stress of the truss bridge in the whole construction phases agreed pretty well between the testing results and the calculating results. The maximal cantilever length phase to entire bridge closure phase is the most disadvantageous state in the whole construction process.
Quick Verification Technology of Coordinate Measuring Arm
Authors: Ouyang Jian Fei , Liu Wan Li
Published: November 2010

The features of the widely-used coordinate measuring arm (CMA) are discussed. A novel technology for quick volumetric error verification of CMA is presented. A modular space frame (MSF) to verify and calibrate the measuring accuracy of CMA is invented, which consists of standard balls, links and bases. An effective verification procedure is developed. Results are presented that show CMA can be verified and calibrated with accuracy of 0.015mm in 5 minutes by using the proposed method.
Study on the Algorithms of Holes Feature Recognition in Auto Body Panels Based on UG
Authors: Kang Wen Qian , Li Di , Guo Peng Wei
Published: November 2010

Feature recognition is the key technology in establishing auto body panel CAPP system. For regular parts, it has made great achievements in features recognition, which has laid a foundation for feature recognition for complex shape parts, such as auto body panels. This paper has classified holes feature into two-dimensional holes, three-dimensional holes and special holes according to its forming and function properties, and established process expression mode of holes feature on account of the requirement of CAPP system. Algorithms have been developed for holes feature recognition based on recognition rules making use of geometric features of holes’ boundary in UG software, two-dimensional holes and three-dimensional holes can be automatically distinguished, circle holes and non circle holes can also be differentiated automatically, further more, the algorithms can give radius of circle hole and minimum radius of curvature of shaped hole’ boundaries.
Thermal Design, Analysis and Experimental Verification of a Satellite Borne Electronic Equipment
Authors: Chen Bo
Published: November 2010

Thermal design, finite element analysis and experiment verification of a satellite borne power amplifier are introduced in this paper. Some methods were adopted to help heat conduct and a simplified computing model was built. The analysis results show that the temperature scope of the main structure is from 45.3°C to50.7°C in high temperature work case and -9.7°C to -4.3°C in low temperature work case, and all of junction temperatures of components with high heat power consumption are lower than the derated maximum junction temperatures themselves and leave enough design margins. The experimental results show that the computing values are very close to experimental values and the largest error is 1.9°C, which proved that the simplification of model and the values of computing parameters are reasonable. Thermal analysis with reasonable model simplification and computing parameters would be helpful for production design.
Development of Constitutive Relationship for the Hot Deformation of Ti-47Al-2Cr-2Nb-0.2W Alloy
Authors: Wang Hui , Liu Yong , Zhang Wei , Wang Li , Liu Bin
Published: November 2010

The high temperature deformation behaviors of Ti-47Al-2Cr-2Nb-0.2W alloy were investigated by isothermal compressive tests, performed at temperatures between 1000 and 1150 , strain rates between 0.001s-1 and 1s-1. The stress-strain curves of IM alloy exhibited an obvious work hardening peak followed by a broad flow softening at high strain rates(≥0.1s-1) while work hardening could hardly be seen from the stress-strain curves at low strain rates(≤0.01s-1). Also, the constitutive equation of the alloy had been established to describe the flow behavior. The apparent activation energy of hot deformation was calculated to be 351.61kJ/mol. The size of the recrystallized grain increased with increasing temperature and with decreasing strain rate, namely with decreasing the Zener-Hollomon parameter Z. It is necessary to select proper Z, that is, to strictly control the deformation parameters in order to obtain a homogeneous and fine microstructure.
Study on Product Design Process Management
Authors: Li Shen , Shao Xiao Dong , Chang Jian Tao
Published: November 2010

A new workflow technology, which is developed for product design process management (PDPM), is studied in this paper. Firstly, a new product tree structure, which associates workflow with components and solves process-data management problem, is put forward. Secondly, an improved flow structure consisting of workflow and dataflow and being driven by design-parameters is developed. Lastly, Dataflow structure for parameter integration is designed. A PDPM prototype system is developed and applied in engineering.
Characteristic of Cu-Based Catalytic Coating for Methanol Steam Reforming Prepared by Cold Spray
Authors: Wang Feng , Zhou Jing , An Zi Long , Zhou Xin Jing
Published: November 2010

Cu-based catalyst is active for methanol steam reforming (MSR) at low temperature. The Cu、Cu+Al2O3 composite and CuO/ZnO/Al2O3 catalytic powers are used as feedstock for coating fabrication by cold spray. MSR experiment and SEM、EDX 、XRD analysis before and after the MSR on the coating has been carried out to study the micostructure and catalytic characteristic of the deposits. Results show that, after reaction the morphology of the Cu coating changes from piled sheets structure to mciro-ramify structure, its porosity obviously increase, the net weight of O、Al in the coating increases, H2 content in the reaction products reaches 74.9%. While for the Cu+Al2O3 composite coating, the content of copper in the coating decreases compared with the initial powder, and the stability of Cu+Al2O3 coating is better than the copper coating in MSR reaction. Particle bonding between coating and substrate and the bonding between the particles in the coating is mainly belonged to mechanical bite and physical bonding; Porosity in the latter two coating is higher than the copper coating. But there is no phase change of the coating. CuO/ZnO/Al2O3 coating shows a much higher activity than conventional fixed bed catalyst due to the reduction of heat and mass transfer resistance in the reactor. So it is available to fabricate catalytic coating by cold spray.
Design and Simulation Analysis of Hydraulic Torque-Loading Device for Sintering Machine
Authors: Ren Su Bo , Bai Ming Hua
Published: November 2010

In order to solve arching and air leakage problems of sintering machine, based on the mechanical analysis to arching phenomenon, the hydraulic torque-loading device was designed, the simulation to the device was made using AMESim software, finds the reasons that system generating vibration and noise when running. By adjusting the structure parameters of hydraulic components, adding accumulator and damping system, solve the vibration problem of the system effectively, and can run smoothly in accordance with design requirements, the research provides a new method for solving arching and air leakage problems.
Optimal Design of Television Packaging Based on Drop Analysis
Authors: Zhao Deng Feng , Ma Guo Lu , Zeng Guo Ying
Published: November 2010

Optimization method was applied to obtain optimal television packaging cushion for reducing drop impact response on television. At first, by establishing the parametric finite element model of television with packaging, the drop simulation was performed, and the equivalent stress distribution, acceleration response curve and other related parameters were obtained. Simulation shows that maximum acceleration is overload. Then, structural optimization of television with packaging was performed. The equivalent stress distribution and acceleration curves of optimal packaging and without optimal packaging for the independent components were studied. The results show that maximum acceleration is reduced and the cushioning performance is enhanced.
The Effect of Material Performances of Knit Fabric on Clothing Comfort
Authors: Yu Yao , Qian Xiao Ming
Published: November 2010

With the purpose of clothing thermal-wet comfort, this paper chooses clothing materials to be the object of study. The research focuses on how performances of clothing materials and parameters which affect performances of clothing materials influence on clothing comfort. And this paper is proposed that "Fiber - Yarn - Fabrics - Clothing" can be made as the research system for the first time in the field of clothing thermal-wet comfort studying. According to the experiments, it analysis that these three variables— “fibers”, “yarn properties” and “fabric performance”— affect clothing thermal-wet comfort. Based on the contrastive analysis of test result, it can gain the effect of these three variables on clothing comfort. The result is, 1, in these three variables, the effect of yarn fineness on thermal insulation is the highest level of significance, and the second one is fibrousrawmaterials. 2,under the situation which other two ones among these three variables are constant in chosen laboratory samples of this paper, the knitting fabric which is with the cotton fabric, 14.6tex, jacquard weave is the best comfortable.
Efficient Design on Body Strength and Capacitance of MLCC
Authors: Cheng Ching Ming , Hsu Yao , Wu Wen Fang
Published: November 2010

When designing the capacitance of a Multi-Layer Ceramic Capacitor (MLCC), engineers used to focus on the way to find appropriate combination of the design parameters. These design parameters usually include materials, layer numbers and thicknesses of the electrodes and the dielectrics. However, not considering the mechanical strength in the design stage may lead the manufactured MLCC prototypes to fail in material test, and a redesign is very often needed. Such a design-and-redesign process is inefficient and needs to be improved. The present paper proposes a simple and efficient design approach to replace the traditional one. It first identifies an empirical equation correlating the capacitance of a MLCC to the design parameters based on specifications. The strength of the MLCC can be evaluated in advance with the help of mechanics of material. A design platform which considers simultaneously the capacitance and the material strength under various design parameters can be established. Demonstration of a MLCC design by the developed platform indicates the proposed approach does help engineers improving and speeding their designs.
The Process Parameters Modeling and Experimental Study Based on BP Neural Network for Laser Direct Rapid Forming Metal Parts
Authors: Wang Jian Bin , Yin Ji Shu , Chen Bing Huang
Published: November 2010

Discussed in detail using BP neural network to establish the quantitative relationship model between the process parameters and components density on the laser direct rapid forming (LDRF) metal parts, in which input of single-pass sintering model is: laser power (P), scanning speed (V ) and powder feeding rate (G), performance indicators to measure the width of the sintered layer (W) and height (H); input of multi-pass multi-sintering model is: P、V、G、scan spacing (D) and layer thick ( ), the performance measure for the density of sintered parts，And neural network simulation results and experimental results are analyzed and compared. The results show that using BP neural network model can quantitative analyze the effect on sintering process parameters and the sintering performance, the model for the optimization of LDRF process parameters has built the foundation.
Preparation of High-Purity Nanometer Bismuth Trioxide from Silver-Zinc Slag
Authors: Liu Li Hua , Wu Jun , Li Xin , Gong Zhu Qing
Published: November 2010

Silver-zinc slag, containing a lot of Bi, Ag, Cu, Zn, Pb and a little Au, has high comprehensive utilization value. This paper describes a preparation method of high-purity nanometer bismuth trioxide (Bi2O3) from silver-zinc slag by hydrometallurgical method. The results showed that Bi could be effectively leached out from silver-zinc slag using sodium chlorate, hydrochloric acid and sodium chloride as leaching agents, and the leaching rate of Bi was up to 99.03% under the optimum conditions. The contents of Pb2+ and Ag+ in BiCl3 solution could be reduced to about 1mg/L by using silver-zinc slag as reductant and sodium iodide (NaI) as precipitant, respectively. Crystalline form of Bi2O3 is affected greatly by concentration of NaOH, conversion temperature and time. The suitable temperature of BiOCl converting to Bi2O3 was 90 , and the suitable surfactant was polyvinyl alcohol. The average particle size of Bi2O3 obtained was about 86 nm, the purity of Bi2O3 was up to 99.75%, and the yield was 98.21%.
29Si and 27Al MAS-NMR Studies of Fly Ash Changes during the Polymerization of Mineral Polymer
Authors: Nie Yi Miao , Xia Mao Hui , Niu Fu Sheng , Liu Shu Xian
Published: November 2010

Mineral polymer is a new category of inorganic non-mental materials, which was manufactured from fly ash in this paper. Changes of fly ash in the polymerization can be described as: (1) Q4(0Al) is the main form of Si element in fly ash, with 67.5%content.During the solidification of mineral polymer, the content of Q4(0Al) decrease from 38.7%(3d) to 28.2%(7d) and 26%(14d), then increased to 37.8% in 28 d product; (2) the intensity of Q2(0Al) and Q3(1Al) decrease at first stage, then increase finally during the solidification of mineral polymer; (3) content of Q4(2Al)increase from 14.6%(3d), 39.2%(7d), 40.6% (14d) and decreased to 23.1% in product curing for 28 d product;(4)octahedral aluminum were the main form of Al element in fly ash, which decreased during the polymerization, simultaneously, tetrahedral aluminum increased. The experimental results provided a good basis for understanding the reactive mechanism of polymerization.
Investigation on Crushing Kinetic Equation of Ball Milling of Quartz Powder
Authors: Liu Shu Xian , Shen Li Li , Wang Qian Ping , Niu Fu Sheng
Published: November 2010

The kinetic equation of ball milling of quartz powder was deducted. by grinding quartz experiments in a intermittent ball mill. The results showed that: (1) Conventional first-order kinetic equation which describe the velocity of quartz grinding is not concordant with theory. Dynamics parameters are not constant, but time-related. (2) The kinetic equation of time correction can more clearly express their grinding speed. Fitted regression equation has a more accuracy prediction for the instantaneous concentration of particle size, and obtain the dynamics constants. (3) The grinding speed has a maximum value over time because of the particle size distribution and grading comminution. (4).The time index is not only related with the material nature and conditions of the grinding, but also with the particle size distribution. To predict accurately, the grade range should be narrow. (5). Different grinding time distribution of particles in the ball mill should be measured in the continuous grinding process. The comminution results can be predicted by the kinetic equation mentioned above.
Formation Mechanism of Soot in Zinc-Bearing Dusts Direct Reduction Process
Authors: She Xue Feng , Xue Qing Guo , Yang Hui Xian , Ding Yin Gui
Published: November 2010

The high-temperature tube furnace was applied to simulate the rotary hearth furnace (RHF) for the direct reduction of the zinc-bearing dusts from steel plants. The soot generated in the direct reduction process was studied by chromatography, X-ray diffraction (XRD), .and scanning electron microscopy (SEM) etc. The results suggested that the main phases of the soot were ZnO, KCl, NaCl and Zn5(OH)8Cl2H2O. Furthermore, the contents of Zn reach to 64.2% which could be used as secondary resources for zinc making. It is concluded that KCl and NaCl resulted from the volatilization from the briquettes at the experimental temperature of 1573K, while the ZnO were produced by the oxidation of the Zn vapor reduced from briquettes.
Numerical Study on Transient Heat Transfer in a Regenerative Oxidation Bed during the Preheating Process
Authors: Liu Yong Qi , Han Jin Hui , You Yan Yan , Gao Zhen Qiang
Published: November 2010

The transient heat transfer characteristics of a regenerative oxidation bed placed in a coal mine methane thermal reverse-flow reactor during preheating process are numerically investigated in this paper. The regenerative oxidation bed is modeled in a three-dimensional, unsteady state and laminar flow system, and is assumed as a semitransparent porous media. The calculating results indicate that increasing the inlet mass flow could shorten the time of preheating, specific heat and porosity have a great influence on the heat storage capacity of the regenerative oxidation bed, and the contribution of the solid phase radiation to heat transfer can not be ignored. All these work can help to understand the heat transfer phenomena and mechanism in a regenerative oxidation bed during the preheating process.