bluuebunny/crossref_metadata_2025 huggingface dataset:
Control Final Cooling Temperature on High Strength of the Pipeline Radio Yield Influence
Authors: Ma Yong Jie , He Xun , Zhang Guang Liang
Published: October 2011

In high strength pipeline steel rolling technology, the control of final cooling temperature of different microstructure, different microstructure of pipeline steel tensile strength, yield strength and the effects of different, thus determine its yield ratio differences. The results show that with lath bainite microstructure of the pipeline steel than with acicular ferrite microstructure of the pipeline steel with lower yield ratio, at the same time lath bainite microstructure in small dispersed precipitates in pipeline steel X80 pipeline steel to reduce the yield ratio is beneficial, for high strength pipeline steel production technology to provide the theory basis.
Research about Numerical Integration Method for Structural Dynamic Response in Real Time on-Line Test
Authors: Ge Nan , Chen Hai Bin , Su You Po , Wang Xing Guo
Published: October 2011

The modified equations for PC-Newmark method and OS (operator-splitting) method were derived, which could be applied to the numerical solution for the non-linear equation encountered in real time on-line test. The structure with FPS seismic isolation system was divided into three substructures, namely the FPS system, the experiment substructure and the computation substructure. The explicit algorithm is applied to the first two substructures and the implicit algorithm to the third one in order to loosen the stability limitation. The numerical solution for a 7 DOF structural model has proven the alleviation for stability requirement.
Study on the FCG Prediction Model Based on Material’s LCF Damage
Authors: Chen Long , Cai Li Xun , Yao Di
Published: October 2011

Abstract: Based on the cyclic elasto-plastic HRR field near the crack tip under the cyclic loading, combined with the Manson-Coffin theory, a unit average damage over the plastic strain magnitude of the node in the cyclic plastic region was defined. Then, combined with the linear damage accumulation theory-Miner law, the crack was assumed to advance each step of the size of cyclic plastic region along the extending direction. Therefore, a new model for predicting the fatigue crack growth (FCG) of the opening mode crack based on the low cycle fatigue damage was set up. In the new model, a variable factor to calculate the blunting size during the process of crack advancement was applied, and the plastic damages of the material located in the cyclic plastic region along the extending direction were considered. Obviously, the advantage of the new model is that every factor has clearly physical meaning which does not need any human debugging. Based on the low cycle fatigue (LCF) data gained from the laboratory, the predictions of the FCG by the new model is consistent with the test results of X12CrMoWVNbN 10-1-1. What’s more, according to the reference papers, the good predictability of the new model on four materials is also discussed.
Seepage Analysis for Dashiban Landslide Applied Multi-Day Rainstorm once in Hundred Years
Authors: Feng Qiang
Published: October 2011

Saturated and unsaturated seepage analysises are given for Dashiban Landslide applied multi-day rainstorm once in hundred years including three day and five day and seven day rainstorm. The impaction of rainstorm on the stability of landslide is discussed.
Effect of Ultrasound Treatment on Properties of Soy Proteins Film
Authors: Sun Yang , Sun Chun Yu , Chen Guang
Published: October 2011

Soy protein isolate(SPI) based edible film as matrix materials have been prepared using the casting techniques. Ultrasound treatment (UT) could represent an interesting strategy for improving Soy protein film appearance. Different UT exposure times were applied to film-forming dispersion. The aim of this work was to investigate the effect of ultrasound treatment on Soy protein films at molecular structure and mechanical properties. The results showed that the structure of SPI film became more homogeneous and the properties has been improved largely after treated by ultrasonic, with the output power 1000 w for 16 s the tensile strength was the best; for 12 s, elongation reach the peak.
Stress Distribution Rule of Reinforced Concrete Specimen under Uniaxial Tension
Authors: Zhang Juan Xia , Guo Xian Zhang , Zhuo Sheng Guang , Tang Chun An
Published: October 2011

A numerical test code named RFPA (Realistic Failure Process Analysis) was used to investigate the stress filed transformation process of the reinforced concrete specimen under uniaxial tensile loading. The periodically distributed fracture spacing phenomenon exists in the reinforced concrete structure and the concrete cover thickness was an important factor influence the average crack spacing and crack number. The numerical simulation results show that the stress fields on the concrete between the two adjacent cracks go through a variation process from tensile stress to compressive stress with the increasing of the concrete cover thickness value. It is clear that the stress distribution and fracture spacing were related to the concrete cover thickness under the condition that the materials characteristics were certain (such as concrete and reinforcement materials).In addition, if there was a new crack produced, the location was sure in the middle of the two adjacent cracks since the maximum stress occurred in the middle of the two adjacent cracks. So, it indicates that the concrete cover thickness can influence the average fracture spacing and the crack number in the reinforced concrete prism specimen.
The Brief Introduction of High-Speed Trimaran Planing Hull and the Preliminary Study of the Longitudinal Stability
Authors: Zou Jing , Wang Qing Xu , Shi Sheng Zhe , Zhou Jie
Published: October 2011

The character of lines and high-speed performance of trimaran planing hull is briefly introduced. By use of model experiments the law of longitudinal motion stability of the trimaran planing hull is studied. According to the combination of upper and lower speed limits at which the dolphin motion takes place at different displacements and the positions of gravity, these critical points from the experiments are linearly fitted by using MATLAB in order to obtain the limit curve. The veracity of the limit curve to evaluate the longitudinal stability is proved.
Modification of Flow Stress Model Based on Internal Variables
Authors: Nowak Jaroslaw , Svyetlichnyy Dmytro S. , Łach Łukasz
Published: October 2011

In the paper a flow stress model based on the dislocation theory in consideration of the recrystallization is shortly presented. The model contains two parts: a classic model of dislocation evolution and recrystallization model. The latter considers different kinds of recrystallization as the same process rooted in nucleation and grain growth. The results of the model parameters identification and the simulation are presented in this paper. Then disadvantages of the model are considered and new proposal for improvement the model are presented. Results of preliminary simulation are presented as well
Research on Lower Muscle Strength Feature for Elite Speed Skaters in High Speed Gliding
Authors: Wang Xin
Published: October 2011

In order to obtain the Lower Muscle Strength Feature for Elite Speed Skaters in High Speed Gliding, this paper applied video analysis and isokinetic testing methods to conduct kinematic and kinetics dates. Contrasting to the kinematics dates, torques were computed by the Newton interpolation polynomial, which are simulated as the actual moments during gliding. According to the experimental results, the sLower Muscle Strength Feature is unique and correct.The larger of the velocity, the less moments produced from the hip, knee and ankle muscular, which will do harm to the power output.
Dynamic Analysis of Response of Cofferdam with Steel Sheet Piles Induced by Earthquake Excitation
Authors: Cui Chun Yi , Wang Zhong Tao , Huang Jian
Published: October 2011

For its construction convenience and structure integrity, cofferdams are widely employed in port engineering. Past experience has shown that cofferdam are subjected to damage due to earthquake excitations. Numerical analyses with both response spectrum and step-by-step integration methods are conducted by using Lanczos eigenvalue extraction technique to obtain natural frequencies and modes, and solving dynamic equations with Newmark implicit method to consider geometric nonlinearity. The computational results show that the natural frequency of cofferdam system is low and the horizontal translation stiffness of cofferdam in positive direction is higher than that in negative direction. Under seismic excitation, the displacement response of inner steel sheet is much more obvious than that of outer one. And the distribution of horizontal displacements in steel sheets presents the characteristics that the corresponding values increase with their heights in the cofferdam system. On the contrary, the deviatonic stresses of cofferdam decrease with the augments of height.
Corrosion Behavior of Electroless Deposited Fe-Zn Coating
Authors: Wang Xi Ran , Wu Jing , Hu Xin Gang
Published: October 2011

In this work, Fe-Zn coating on copper is obtained by electroless plating. The surface mor -phologies and composition of the coatings has been investigated using scanning electronic microscope (SEM) and energy dispersive spectroscopy(EDS). Corrosion behavior of Fe-Zn coating in3.5% NaCl solution is gaved a further insight. The impedance diagram indicates that corrosion resistance of coating is better. The open circuit potential of Fe-Zn coating is at about -1V. Self-corrosion potential of Fe-Zn coating in 3.5%NaCl solution shifts in the positive direction first and then shifts from -0.622V to -0.603V with increasing heat-treated temperature, while corresponding self-corrosion current decreases at first and then. increases Corrosion resistance of coating is the best when heat-treated temperature is 300°C.
Ablation Properties of C/C-ZrC-SiC Composites
Authors: Gao Meng Jiao , Chen Lai , Hua Yong Sheng , Ren Mu Su , Sun Jin Liang
Published: October 2011

The ablation properties of C/C-ZrC-SiC composites prepared by precursor infiltration and pyrolysis processes were studied by the H2-O2 ablation method. The results indicate that the C/C composite of 1.28 g•cm-3 was densified to C/C-ZrC-SiC composite of 1.42 g•cm-3 after infiltration and pyrolysis once, the density increased 10.94%. The linear ablation rate and mass ablation rate of the C/C-ZrC-SiC composites (ρ=1.42g•cm-3) were 7.22μm•s-1and 3.88mg•s-1, which decreased 79.31% and 65.46% comparing with C/C composite of 1.28 g•cm-3 respectively. The introduction of ZrC-SiC into the matrix greatly enhanced the anti-oxidative and ablation property of the C/C composite. The ablation mechanisms of the C/C-ZrC-SiC composites were supposed to be the synergistic effects of thermo-chemistry ablation (oxidation and sublimation) and mechanical erosion.
Oxide Film Morphology and Composition Analysis of TP304H Austenitic Stainless Steel at High Temperature
Authors: Liu Mao Lin , Wang Zhi Wu , Wei Wei
Published: October 2011

The oxide scale of TP304H austenitic stainless steel was analyzed with SEM, X-ray, and ESA after being oxidized at 650 °C, 750 °C and 850 °C for different time. The results show that: the initial oxide film consists of needle-like cores. With the heating proceeding, the needle-like cores grow up gathering into granular cores, and then new needle-like cores grow up on former granular cores, and gradually grow into flakes which continue to gather into more granular cores then. As the oxide film becomes thicker, this process is in continuous cycle. The subsequent needle-like or flakey cores form on the basis of previous granular cores. The content of metallic elements is analyzed to find the law of diffusion and oxidation. As the figure shows the Fe of the matrix diffuses outward and the oxidation takes place at the oxide film-gas interface, which means a series of reactions does not occur inside the matrix. Below the temperature of 650 °C, the growth of oxide film is relatively slow, while above this temperature diffusion and displacement of metallic elements and oxide film growth rate accelerates. The oxide film is easy to fall off when reaching to a certain thickness, which means that TP304H stainless steel is not suitable in high-temperature and oxidative environment for long service.
Novel Synthesis of TiO2 Nanocrystals Induced by Nanocrystal Cellulose
Authors: Peng Xin Yan , Ding En Yong
Published: October 2011

A new method was developed to synthesize high active TiO2 nanocrystals by the hydrolysis of titanium (IV) chloride in water at 40-80°C, employing nanocrystal cellulose (NCC) as morphology controlling agent. The obtained samples were characterized with transmission electron microscopy (TEM), X-ray diffraction (XRD), and ultraviolet-visible spectrophotometer. TEM investigations revealed that the crystals synthesized at 40-60°C were flower-like which was composed of nanoneedles, and when the temperature rose up to 70-80°C, cubic nanocrystals with an edge length of 100-200 nm were observed. XRD results showed that the crystalline phase of the nanocrystals had a strong dependence on the temperature and aging time, and the content of rutile phase increased with increasing either the temperature or the aging time. The photocatalytic activities of the samples were tested by the degradation of methyl orange in aqueous solution under high pressure mercury lamp. The experimental results revealed that cubic nanocrystals showed much higher photoactivity than flower-like ones.
Research on General Wheelchair Comfort Design
Authors: Yuan Yan Li , Guan Tian Min , Tong Xiao Ying , Lei Lei
Published: October 2011

Wheelchair is an important tool for those persons with physical disabilities to rehabilitation, work, daily life and so on, and comfort is an important element of wheelchair. This paper analyzed the condition of wheelchair comfort design, summarized the existing problem, proposed the suggestions on improving the wheelchair comfort design and described the personal wheelchair design research.
The Expert System for Auto Programming in Coordinate Measuring Machines
Authors: Pei Shi Hui , Ma Yu Min
Published: October 2011

Flexible automated manufacturing environment put new demands to the Coordinate Measuring Machines, an operator in CAD center, inputs inspection requirements according to the drawings parameter, should automatically generate the CMM measuring programs. To solve these issues, we use of an expert systems which is composed of the knowledge base, the inference engine, a database and a human-machine interface.
Research of Metallic Part Fabrication by Selective Laser Melting
Authors: Chen Guang Xia , Guang Kai
Published: October 2011

The primary goal of this research is the fabrication and measure of metal part made by SLM (selective laser melting) system. The SLM system is separated into two sections which are hard system and software system. The hard system is consisted of an Yb-fiber laser, an optical scanner, a powder coating device, a gas purification system and a CNC system; the software system is mainly consisted of CAD model display module, slicing and path layout module and processing control module. A removable partial denture framework was fabricated by this SLM system using stainless steel. A method of metal part precision with complex shape is that using reverse engineering and the average tolerance of metal part fabricated by SLM is ±0.172mm by using this method. The experimental results showed that SLM system developed by us can settle for the need of laser rapid prototyping in metal part fabrication.
Study on EDM Technics of Polycrystalline Cubic Boron Nitride Cutting Tool and PcBN Cutting Tool’s Life
Authors: Jia Yun Hai
Published: October 2011

The samples of Polycrystalline cubic boron nitride (PcBN) cutting tool were machined by adjusting the main parameters of electrical discharge machining (EDM). After the machining, the phases were analyzed by X-ray diffraction analyzer and the surface layer microstructure was observed by scanning electronic microscope. The fundamental component of machined PcBN cutting tool affected layer was obtained and the reason of begetting affected layer was analyzed. The relationship curves between pulse width, working electric current and thickness of affected layer, blade surface roughness were summarized. The relationship between PcBN cutting tool’s life that was machined by EDM and cutting tool flank width, workpiece surface roughness were analyzed. The results showed that to adjust electrical discharge machining parameters, such as decreasing pulse width or machining electric currents, can reduce the thickness of affect layer, improve blade surface roughness and extend the service life of PcBN cutting tool. These researches provide valuable test reference for drawing up electrical discharge machining technics of PcBN cutting tool and forecasting cutting tool’s life.
Control of Thermal Effect in Ion Beam Figuring Process Based on Low-Pass Filtering
Authors: Yuan Zheng , Dai Yi Fan , Yu Hao , Xie Xu Hui , Zhou Lin
Published: October 2011

During ion beam figuring process, most heat energy is absorbed by optics surface, heating the workpiece surface un-uniformly, called thermal effect. Thermal effect leads to distortion even cracking of the optical figure due to high temperature and temperature gradients, especially for the temperature sensible materials such as BK7, KDP and CaF2. One of the methods on decreasing thermal effect is decreasing total dwelling time and dwelling time gradients. According to the ability of ion beam correction, It is proposed that a new surface error distribution is obtained by filtered by a low pass filter from the initial surface error distribution measured by interferometer, and then it is used to calculate the dwelling time function. It is indicated by simulation that this measured decreases the total dwelling time and dwelling time gradients, reduces the temperature peak and heat stress. At last, a flat surface with the surface accuracy of 0.002λ rms is obtained from the initial surface error of 0.006λ rms, proving that high precision surface can be achieved with the surface after low pass filtering. So it is of great signification for actual application on ion beam figure temperature sensible materials.
Modal Analysis and Optimization Design on a Vehicle-Load Rectangle Liquid Containers under Fluid-Structure Coupling
Authors: Liu Nan , Zhao Jun , Zhang Hong Wang , Huang Xin , Liu Jin Li
Published: October 2011

This paper addresses vibration characteristics issues of a rectangle liquid container under both empty and fluid-structure coupling conditions. It uses finite element programming to calculate different rib reinforcement liquid container structures numerically. Results of the calculation provide the numerical and theoretical supports of liquid containers design for the series of engineering conditions.
The Industrial Application of Dynamic Soft-Reduction Technology on the No.1 Slab Continuous Caster in No.2 Steelmaking Plant of Xinyu Steel
Authors: Kong Yi Wen , Feng Ke , Han Zhi Wei , Cao Jian Feng
Published: October 2011

Through the one-month intense industrial test, the CISDI packaged soft-reduction technology of slab continuous casting has been put into practice to the No.1 slab caster of the No.2 steelmaking plant in Xinyu steel, China. The whole system has many advantages, such as the advanced algorithm and idea, the reasonable platform structure and the improved control function, which has been running stably and reliably. During the test process, a new calibrating method of roll gap has been adopted, which resulted in the perfect precision of gap control and the rational pressure feedback of hydraulic cylinder. By comparison of the macrographs of slab samples for the various steel grades, definitely, it can be concluded that, the application of the dynamic soft-reduction function will improve the internal quality of slab obviously, which has notable metallurgical effects on the center segregation defect of slab.
Numerical Analysis on Internal Flow Field in Stator of a Torque Converter
Authors: Liu Yue
Published: October 2011

The internal flow field in stator of a torque converter was simulated. Based on the mixing-plane technology, using the method of CFD(Computational Fluid Dynamics) simulated the stator flow field. The flow field characteristic, the distribution of velocity and pressure in the stator were analyzed. The external performance of the torque converter was also calculated, and the results were compared with the experimental data. It was proved that the calculated results showed agreement with the experiment accurately.
Effects of Aluminum Oxide on Combustion Behavior of Intumescent Fire-Retarded Polypropylene Composites
Authors: Hu Shan , Jing Hui , Zhang Jun
Published: October 2011

The melamine phosphate (MP) was synthesized from melamine and phosphate acid. Aluminum oxide (Al2O3) was added into the MP during its synthesis. Fourier transform infrared spectroscopy (FTIR) was used to characterize the reaction products. The composites were prepared from polypropylene (PP) and intumescent flame retardant (IFR) additives of MP and pentaerythritol (PER). The effect of Al2O3 content on the properties of the composites was investigated by the limiting oxygen index (LOI), thermogravimetry (TG) and scanning electron microscopy (SEM). The results indicated that the LOI value of the composites could be enhanced obviously with suitable content of Al2O3. When the Al2O3 content was 6 wt% in MP, the LOI value increased to 35.5% from 31.0% for the composite without Al2O3, the amount of residual char at 600°C increased from 8.9 wt% to 13.9 wt%.
Analyse of Flexible Assembly Cell via Software Witness
Authors: Matúšová Miriam , Hrušková Erika , Velíšek Karol
Published: October 2011

This Computer simulation models allow to solve the problems by their complexity beyond the capacity of other mathematical and analytical methods. WITNESS is suitable software for simulation and optimization of production, service and logistics systems.
Rapid Design System Based on Re-Development of Rhino
Authors: Qi Bin , Sun Xia , Liu Yu Rong , Sun Xiao Ming , Wang Miao
Published: October 2011

Fire engine design is based on the traditional method and product design cycle. In this way, it cost a lot of time. The article proposed a new fire engine design flow. Under the parameter restraint conceptual design method, Rapid Design System (QDS) constructed the database which has the parameter reference value non-parameter model. This article taken the fire engine as an example, and constructed the fire engine Rapid Design System using Script, Visual Basic 2008, and Access2007. The example confirmed this method to raise fire engine's design efficiency.
Research on Mass Customization Kitchen Cabinet Products Design
Authors: Yu Shu Lan , Wu Zhi Hui
Published: October 2011

Based on the analysis of customization demands and shortages of the existing kitchen cabinet products, this paper built a kitchen cabinet customization design system architecture, and puts forward that this system can be achieved by three modules of product family model, design process of custom kitchen cabinet and cost estimation of kitchen cabinet products; This paper also studied the establishment of product data model, product customization process and collaborative customized digital design support tools based on modularization and adjustable factor and other key technologies involved in the achievement of kitchen cabinet digital design under a circumstance of mass customization. Finally, this paper also proposed the technology feasibility of developing a digital design prototype system orienting to the domestic kitchen cabinet enterprises.
The Simulation Analysis on Side Collision Safety of Electric Buses
Authors: Wang Zhen Po , Shi Sheng Jie , Wang Yue , Sun Xiao Hui
Published: October 2011

With energy and environmental issues outstanding, electric vehicles have got much room for developments, which also brings a lot of security risks different from the traditional internal combustion engine vehicle such as the electrolyte spillage; toxic fumes; electric shock and so on. This paper simulates the progress of a electric bus side collision with LS-DYNA, and analyzes its security mainly from aspects of the electrical injury and electrochemical injury: internal short-circuit occurs in battery monomer, external short-circuit outside the battery pack occurs or even cause a fire, BMS, fast fuse and other electronic components with too large deformation in a collision will lose its ability of monitoring external short-circuit of battery pack. Meanwhile, we analyze reasons for the three phenomena above and propose measures for improvement, fix methods and structure of the weak components in collision zone have been improved. Then this paper verifies vehicle security after improvement reducing the electrical injury and electrochemical injury the vehicle on passengers.
The Research of the Super High Pressure Cylinder on Design of Wall Size
Authors: Zhang Yu Xian , Wang Li Fu , Yao Fang
Published: October 2011

The characteristics of stress distribution in high-pressure vessel are analyzed at first. Then the formula of inner pressure is derived. Through analysis the formula, a conclusion that the maximal inner pressure the high-pressure vessel can support goes steady under the diameter ratio is more than 5. Then the formula of equivalent stress at the dangerous position (inside wall) in high-pressure vessel is educed according to the fourth strength theorem and the quantitative relationship in the vessel’s inside pressure and diametrical ratio and the fatigue limit further is founded. Finally, the advice that proper structure is adopted to improve the cylinder’s inner pressure when design thick wall high-pressure cylinder according to relationships as above. These advices have a definite directive significance for how to design and use vessel effectively.
Effects of Deformation Temperature on Dynamic Recrystallization of 7A04-T6 Alloy
Authors: Yu Jian Min , Zhang Zhi Min , Wang Qiang , Zhang Bao Hong
Published: October 2011

The influences of deformation temperature on microstructure dynamic recrystallization of 7A04-T6 ultra-high strength aluminium alloy by isothermal compression experiments in different deformation temperature on the 6300KN extrusion press. The experimental results show that both tensile strength and elongation increased with deformation temperature increasing. At 480°C, tensile strength reached 582Mpa and elongation increase to 9%. In the experiment, dynamic recrystallization of 7A04 aluminium alloy is mainly grain boundary nucleation and second phase particle nucleation. The grain size of 7A04-T6 aluminium alloy gradually refined with the deformation temperature increasing. Fracture morphology showed that rupture is belong to mixed rupture of intergranular and transgranular. With the deformation temperature increase to 480°C, grain size become small, the dimple in the fracture increase gradually, and existing the second phase particle in the dimple.
Finding Appropriate Lexical Diversity Measurements for Small-Size Corpus
Authors: Choi Woon Ho
Published: October 2011

In the present investigation four kinds of lexical diversity measurement have been applied to the sets of word chunks with monotone increasing size. The computational experiment with corpus processing and statistical test has been conducted to find out the most effective lexical diversity measurement in evaluating a small-sized corpus of 350~550 words, and the result shows that D-estimate is the most appropriate among the four lexical diversity measurements which are considered in this research. Also D-estimate shows more stable results than other measurements when the number of words varies between texts.
Effects of Nano-CaCO3 on the Compressive Strength and Microstructure of High Strength Concrete in Different Curing Temperature
Authors: Xu Qing Lei , Meng Tao , Huang Miao Zhou
Published: October 2011

In this paper, effects of nano-CaCO3 on compressive strength and Microstructure of high strength concrete in standard curing temperature(21±1°C) and low curing temperature(6.5±1°C) was studied. In order to improve the early strength of the concrete in low temperature, the early strength agent calcium nitrite was added into. Test results indicated that 0.5% dosage of nano-CaCO3 could inhibit the effect of calcium nitrite as early strength agent, but 1% and 2% dosage of nano-CaCO3 could improve the strength of the concrete by 13% and 18% in standard curing temperature and by 17% and 14% in low curing temperature at the age of 3days. According to the XRD spectrum, with the dosage up to 1% to 2%, nano-CaCO3 can change the orientation index significantly, leading to the improvement of strength of concrete both in standard curing temperature and low curing temperature.
Study on Three-Dimension Computer Aided Process Planning System
Authors: Chen Lei , Deng Ming Ran
Published: October 2011

Aiming at the problem of process data update and working procedure model, the three-dimension CAPP (Computer Aided Process Planning) based on three-dimension CAD (Computer Aided Design) is proposed. The core of the system is the process model that is used to transfer data between CAPP and CAD system. This system can solve the problem of two-dimension CAPP based on parameter feature modeling of three-dimension CAD and has been applied to some aviation enterprises in china.
Multi-Functional Loader Moving Hydraulic System Model Construction and Simulation Based on Power Bond Graphs
Authors: Bian Xiang Juan , Gong You Ping
Published: October 2011

Hydraulic moving system has been extensively applied in small type of loader and other engineering vehicles do to its special superority, how to forecast its dynamic behavior in design stage is most impotant problem. This paper firstly analyse a typical moving hydraulic system of multi-functional loader, and construct its powder bond graphs model and encapsulate these key parts model in soft Mworks. at last, a simpled moving hydraulic dynamaic simulation model was constructed by these components, and some characteristic curves of system can be easily abtained.
Numerical Modeling on Sand Casting Process of a Wind Turbine Part
Authors: Chang Qing Ming , Yang Yin Kai , Chen Xia , Chen Chang Jun , Bao Si Qian
Published: October 2011

In this research work, ProCAST software is employed to study the sand casting process of a box-type part for wind turbine. The casting part is big in size, non-uniform in wall thickness, and heavy in some local positions. Shrinkage cavity and porosity are very likely to from at these locations. By numerical simulation, the influence of the parameters such as pouring temperature, chills, riser on mold filling and solidification is analyzed. Simulation researches reveal that with appropriate pouring temperature, correct number, size and location of chills and risers, a smooth mold filling, reduced shrinkage and other defects are available and desired sound castings can be produced.
Modification of Jig Design to Improve the Ergonomic Rating in Manufacturing Process
Authors: Xu Teng Gang
Published: October 2011

Ergonomics is the study of the job, equipment and workplace in order to make them suitable and convenient to the workers. At an appliance manufacturing company the ergonomic rating of a worker’s hands and arms movement was higher above the desired value. Moreover, there were accidents that occurred on these lines sometimes. This paper analyzed the current scenario and developed a new design carried out on manufacturing Line 1 and Line 2 at that company to make the platform and jig more ergonomic to the operators.
Experimental Research and Application of Mining with Paste Material Stowing
Authors: Qin Guang Peng , Wen Zhi Jie , Li An Min , Zhu Zhu Wu , Sun Peng Peng
Published: October 2011

Mining with filling technology is not only an important part of green mining but also the ideal methods to solve the environmental issues in coal mining. The coal gangue and fly ash and furnace slag were selected as the stowing material and the SL paste as cementing material. These two kinds of material were processed into a toothpaste-like slurry without dehydration on ground and transport to underground with the help of gravity or stowing pump in order to stowing the goaf and control the movement of superincumbent strata .Industrial test at Xinsan colliery showed that such kind of paste filling material has high early strength, when filling body was used for false roof of work-face, the post-strength requirement of paste filling material can ensuring false roof stability.
A Study on the Cellphone Cover-Forming Process of Titanium Alloys Using the Finite Element Method
Authors: Chen Dyi Cheng , Chen Ming Ren , Nian Fung Ling
Published: October 2011

In recent years, the style of 3C products demanded thin and small results due to gradual trends, though most of the industry is forming a continuous manner of stamping. However, the material thickness cannot be changed in products. This paper employs the rigid-plastic finite element (FE) DEFORMTM 3D software to investigate the plastic deformation behavior of titanium alloy (Ti-6Al-4V) workpiece for the forming processes of cellphone covers. In addition, this study utilizes the Solid Work 2010 3D graphics-rendering software for modeling, which is simulation software used to import various forming process conditions. The software analyzes the effective strain, the effective stress, critical damage value, and the die radius load distribution of the work-piece. Furthermore, this study used simulative software to analyze its forming processes for changes in grain size of the microstructure. The analytical results confirm the suitability of the current finite element software for forming processes of cellphone covers.
Experimental Study on a Micro-Scale Shaft Grinding Tool
Authors: Cheng Jun , Gong Ya Dong , Liu Yue Ming , Yang Jian Yu
Published: October 2011

This paper presents a novel micro shaft grinding tool is fabricated by cold sprayed with CBN grains, and a micro-grinding experiment is carried out to study micro grinding principle of the fabricated tools. The manufacturing is carried out on a desktop micro machine developed by NEU. Influences caused by particle size on surface quality has been discussed, it has been tested that low surface roughness could be achieved on 3000 particle size of micro shaft grinding tool, the roughness accomplished in the experiment is about 0.086μm.
Reform of Bilingual Teaching in Advanced Manufacturing Technology
Authors: Ni Hao , Xiao Fan
Published: October 2011

This article analyses the lacking of bilingual teaching of Advanced Manufacturing Technology, and proposes solutions to these lacking.
Structural Optimization Design and Analysis of Impeller Based on Comprehensive Performance
Authors: You Xiao Mei , Meng Lei , Wang Xue Jun , Dai Ji Shuang , Wen Bang Chun
Published: October 2011

Based on the product integrated design theory, the key part of large-scale centrifugal compressor — the impeller is researched. Structural optimization design and analysis on the conventional impeller is completed by the finite element method, and then the strength characteristic and the distortion tendency of the impeller under the action of the inertial force are obtained, the stress distribution of the impeller assembly structure after reaching stability in the assembly process is also obtained. The correctness and effectiveness of structural optimization design of the impeller are verified by the analysis results, and the comprehensive performance of the impeller has been greatly improved. The results above are also laid the foundation for optimization design and innovative design for other mechanical key components.
Study on VPI Manufacture Technology of Stator Bar for 200MW Air-Cooled Turbo-Generator
Authors: Hu Chun Xiu , Man Yu Guang , Zhang Xiao Hong
Published: October 2011

The dry mica tape and impregnation resin were introduced in this paper, which were main insulation materials of 200MW air-cooled turbo-generator stator bar manufactured by VPI (vacuum pressure impregnation) technology. The insulation manufacture technology, corona protection technology and properties of real products also were introduced in this paper. The results show that the electrical properties of the stator bars made by this kind of VPI technology reached the top level of the world which could be seen as follows: there is no discharge appeared during the AC high voltage potential test when the test voltage was 3UN, the dissipation factor tgδ under 0.2UN is lower than 1%, and the increment Δtgδ=tgδ0.6UN- tgδ0.2UN is lower than 0.5%, when the voltage applied is from 0.2UN to 1.2UN. The magnitude of maximum partial discharge is only 90pc to 110pc, the instantaneous breakdown strength of the bars are all higher than 34kV/mm, under the field of 8.73 kV/mm, the lest enduring time of the test bar is 1500h.
Comparison on Three Computational and Experimental Schemes on Vibration Modal Frequency
Authors: Huang Xue Feng , Ding Ning , Luo Dan , Wang Guan Qing , Liu Yan , Xu Jiang Rong , Chen Zhe Min
Published: October 2011

This paper discussed three schemes to obtain vibration modal frequency. First, theoretical numerical method was introduced to simulate the vibration modal by ANSYS software. Second, one kind of traditional experimental modal analytical scheme was designed to obtain modal frequency by computer random signal and vibration analysis system (CRAS). Third, a new experimental modal test scheme was proposed by FBG test platform. A completed case on modal frequency of the cantilever was carried out by three different schemes, in order to evaluate their merits and drawbacks by comparison. Accordingly, computational modal numerical method in combination with experimental modal test method can meet the analytical demand of modal parameters in practice engineering.
Research on Interception Order Modeling of Air Targets
Authors: Zhou Zhe Shuai , Fang Hong Bing
Published: October 2011

In order to evaluate the threat level of air targets objectively, based on comprehensive consideration the influence factors of threat level of air targets and operational capabilities of weapon system, an improved method of TOPSIS is presented, which is used in comparing and ordering of air targets, and the targets interception order model is also proposed, the optimal solution and the index weights are got by Lagrange multiplier method. Combined with the typical scenario, analysis of example simulation is done and the results show that the method and the model are feasible.
A Method to Calculate Resistance of Ship Taking the Effect of Dynamic Sinkage and Trim and Viscosity of Fluid
Authors: Yao Chao Bang , Dong Wen Cai
Published: October 2011

A method is presented to calculate the resistance of a ship taking the effect of sinkage & trim and viscosity of fluid. The free surface flow field is evaluated by solving RANS equations with VOF method. The sinkage and trim are computed by hydrodynamic equilibrium equations. The method can be divided into direct and indirect method according to the way to calculate trim of ship. The software Fluent is used to implement this method. With dynamic mesh being used, the position of a ship is updated by the motion of “ship + boundary layer” grid zone. The present methods have been applied to the INSEAN2340 hull for different Froude numbers and are found to be efficient for evaluating the flow field, resistance, sinkage and trim.
Analysis of QoS to Guarantee Application SLAs for Trusted Industrial Control Network
Authors: Zhong Ji , Zhou Sen Xin
Published: October 2011

Differentiated services architecture is receiving wide attention as a framework for providing different levels of service in the industrial control networks.Traditional networks are designed with no traffic differentiation; all traffic mission-critical and non-mission-critical is treated equally.In indutrial networks, it becomes important to make sure that mission-critical applications do not suffer. QoS (Quality-of-Service) solutions, available in common network devices, try to provide traffic differentiation and predictable performance for mission critical applications.In this paper we propose a novel Quality of Service provisioning approach, appropriate for trusted industrial networks. This method, based on the real-time system reconfiguration, exploits the system monitoring information, along with quality parameters from the SLAs and experience from previous executions.The presented QoS provisioning process proposes a set of actions based on application specific policies, which are closely coupled with particular SLAs in order to provide the required QoS level for the application. Furthermore, We study applies the methodology using OPNET simulation products to compare and contrast the performance of a new application in an environment with and without IP QoS solutions.
Error Analysis and Measurement of 6PUS-UPS Parallel Machine Tool
Authors: Guo Lian He , Wang Shuai , Liang Shun Pan , Shi Yan , Zhao Yong Sheng
Published: October 2011

Firstly, structure component of the 6PUS-UPS PMT (Parallel Machine Tool) was introduced. Secondly, errors during the machine tool debugging were analyzed and measured, and those determined by the 6PUS-UPS PMT structure character were focused on, including the clearance error between the slider and the guide way, the vibration error and the verticality error and so on. Lastly, the verticality error was measured using the digital display micrometer and the frame level, which has great influence on the 6PUS-UPS PMT precision
Modeling and Simulation of Electric Power Steering System Based on Multi-Body Dynamics
Authors: Hu Jian Jun , He Zheng Bin , Ge Peng , Li Guo Yun
Published: October 2011

In order to analyze dynamic characteristic accurately during steering, electric power steering system is selected as research object and dynamic equation of steering system is established. Combined with eleven degrees of freedom vehicle model and tire model at combined conditions of longitudinal slip and side slip, the integral-simulation model of electric power steering system is established. The dynamic response of steering system at different steering wheel angle, control methods, front wheel steering angle and braking force is analyzed. The simulation results show that electric power steering system with neural network control has good stability, tracking performance, assist characteristic and anti-interference ability. The established model can reflect the dynamic characteristic correctly and effectively during steering.
Numerical Investigation of Flexible Holding Technology for Stretch Forming Process
Authors: Peng He Li , Li Ming Zhe , Han Qi Gang , Feng Peng Xiao , Chen Xue
Published: October 2011

A new type of discrete clamp stretch forming machine based on flexible holding technology was developed to improve the performance of traditional rigid clamp stretch forming machine used for double-curvature metal sheet forming, and its forming characters were illuminated simply. The FE model of flexible discrete clamp stretch forming was set up, and extensive numerical simulations of spherical parts for both the flexible holding mode and the rigid holding mode were carried out by dynamic explicit finite element analysis. The numerical results show that the distribution of stress, strain and thickness were well-proportioned in the flexible holding mode. The larger the spherical radius is, the smaller the minimum transitional length of sheet metal is. The transitional length of 60mm is suitable for flexible discrete clamp stretch forming in the case of considering the forming quality and material utilization. Then, the stretch forming experiment proves that the flexible holding technology is feasible, and the error contrast illustrates the new type of discrete clamp stretch forming machine is practicable.
Mechanical Properties of Molded Pulp Pallet
Authors: Wang Hong Tao , Guo Yan Feng , Luo Guang Lin
Published: October 2011

Molded pulp material has been paid much attention for the cushioning package, yet there is no perfect method for evaluate the cushioning properties of different molded pulp configurations, which hampers the advance of molded pulp industry. In this paper an Equivalent Area Theory are put forward in order to study the cushioning properties of this material and the molded pulp pallet is taken as practical example. By experimental and theoretical analyses, the cushion coefficient and maximum stress curve of the molded pulp pallet is obtained, and a design method of molded pulp pallet is established.
Research on Entity Modeling Method in Agent-Based CGF Simulation
Authors: Song Guo Jun , Mu Xiao Dong , Chang Rui Hua
Published: October 2011

This paper studies the entity modeling method in Agent-based TBM combat simulation system. The architecture of the TBM combat simulation by using HLA/RTI platform has been build. According to the command hierarchy features of military operations, Agent entities are divided into three levels, and a semi-autonomous Agent model has been build. We present a Semantic-based multiple-layered military scenario development framework and implement a Semantic-based Military Scenario Development platform, which can support military commander to semi-automatically generate a military mission plan with MSDL document. Finally gives the flow chart of TBM combat simulation system.
Effects of Annealing Condition on Texture and Deep Drawing Properties of Cold-Rolling Low Carbon Sheet Steel Based on CSP
Authors: Jin Zi Li , Ren Hui Ping , Guo Li Zhen , Ma Sheng Mei
Published: October 2011

With the help of electron backscatter diffraction (EBSD ) and orientation distribution function (ODF) analysis, experiments of the different batch annealing were conducted to give an study of recrystallization and texture of Cold-rolling Low Carbon sheet steel based on CSP , and the relationship between initial isothermal temperature and drawing properties has been investigated. The recrystallization soon finished the grains during annealing produce relatively strong {111} and {111} texture，at this temperature region as the initial isothermal temperature, the double isothermal cover annealing process design, enabling access to a strong favorable texture and uniform pancake grains, and the proper temperature is the key control factor level.
Research on the Internet Banking Security Based on USB Key
Authors: Xiong Ya Zhou
Published: October 2011

At present, USB Key is one of the security technologies which have been used very popularly in the Internet banking. This paper firstly introduces three levels of trade safety protection in the Internet banking, then introduces the basic principle and several important performance indicators of USB Key, and analyzes the challenge of USB Key has faced, finally puts forward some countermeasures.
Study on Hi-Power Precision Driving Power of Giant Magnetostrictive Actuator Based on Power Amplifiers
Authors: Li Yong , Zhang Cheng Rui , Ding Xin Zhong , Zhai Peng , Wu Jing
Published: October 2011

According to the driving characteristics of giant magnetostrictive material and the principle of constant current source analysis, the continuously adjustable driving power was developed by adopting the principle of constant current, selecting power operational amplifier, and using parallel flow technology to expand its output current, which had a large current, large output power, high efficiency and low power consumption. And through the actual test, the driving power of giant magnetostictive actuator reveals a good performance.