bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of Tempering Temperature on Mechanical Properties of 40CrMnSiB Steel
Authors: Yang Hui , Yuan Shu Qiang , Liu Feng Tao , Chen Jiong , Zhou Chun Hua , Wang Fang , Shen Zheng Xiang
Published: January 2014

40CrMnSiB steel is a new type of B-containing structural steel. To research the effect of tempering temperature on mechanical properties of 40CrMnSiB steel, forging, normalizing and quenching are carried out on material firstly, then temper respectively at 350°C400°C450°C500°C550°C600°C650°C and 700°C. After tempering, mechanical properties are tested. Also the hardness, along a radius of section, of the material after tempering at 300°C is measured and the effect of tempering temperature on mechanical properties of 40CrMnSiB steel is analyzed. The results show that: the mechanical properties of 40CrMnSiB steel is sensitive to temper temperature, properties range a large scale with temper temperature; it has a strength of 1800MPa (or more) with good ductility, toughness and fine comprehensive mechanical properties; the hardness of the material after tempering at 300°C is over 50HRC, hardenability is fine, the main microstructure is martensite.
Study on Ecological Restoration of Abolished Strip Mine of Hulunbuir Grassland
Authors: Guo Wen Bin , Liu Tian Kun , Wang Jin Dong
Published: January 2014

Influenced by mining production, the ecological structure and function within the mine area of Hulunbuir grassland has been destroyed. Shut-in strip mine is a typical waste land with degenerated ecological system; therefore, it is necessary to process some ecological restoration projects on vegetation. Theoretical guidance is being badly needed for practice of land-reclamation. This article tries to analyze soil structure and vegetational form in mine area by examples, and adapt method of separately administering different areas which give a good solution of the conflict between strip mine exploitation and ecological restoration in Hulunbuir, provide foundation for further research in this area, as well as have some leading significance to mining development in pasture land area of our nation.
Traffic Flow Turbulence Characteristics Research Based on the Cellular Automaton Model
Authors: Huang Zhi Peng , Cheng Lin , Zhang Wei Hua
Published: January 2014

Turbulence coefficient r is introduced to simulate traffic disorder traffic flow characteristics. By analyzing the disturbance vehicles in the driving environment of different disordered state, the values of model simulation under different conditions analysis, using the traffic flow turbulence coefficient r disorder defined traffic flow characteristics, offers new reference for the study of the traffic flow theory. The accident rate and traffic flow turbulence characteristics are simulated and analyzed, which provides the theoretical gist for the simulation study of traffic flow.
The Numerical Analysis and Simulation of Ni-Ti/Si Shape Memory Alloy Micro Valveless Pump
Authors: Liu De Hui , Liu Li Wen , Tang Gang , Wen Hong Min , Xie Ming Xiang , Lu Quan Guo
Published: January 2014

In this paper, the characteristics of shape memory alloy (SMA) valveless micro-pump and its work principles are introduced at first. Based on the flow property of diffusion and shrinkage elements, the theory analysis is developed for a valveless micropump, and the flow distribution and pressure variation curve are then achieved with Matlab. Meanwhile, the finite model of the valveless micropump is built by using the ANSYS/FLOTRAN CFD finite element software, and coupled-field simulation analysis is carried out. The effects of different geometry parameters of diffusion and shrinkage elements on the pump performance are simulated and analyzed. The results show the valveless micropump working principle is mainly based on the flow difference of diffusion and shrinkage elements and its output characteristics are related to the geometry parameters. These results are helpful to design the optimal valveless micropump.
Notch Sensitivity of Poly(Acrylonitrile-Butadiene-Styrene)/Poly(Methyl Methacrylate)/Ethylene Methacrylate Co-Polymer (EMA) Composites
Authors: Wang Shou Hai , Gao Jun , Lin Shu Xia , Zhang Ping , Huang Jun , Xu Li Li
Published: January 2014

Polymer blends of poly (acrylonitrile-butadiene-styrene)/poly (methyl methacrylate) with ethylene methacrylate copolymer (EMA) were injection molded, and the notch sensitivity of the bends were examined by Izod impact and tensile tests. Investigations revealed that the toughness of ABS/PMMA composites were greatly improved and appeared a linear increase with the addition of EMA. However, the blends also show strong notch sensitivity due to the EMA component but the EMA content seems not a factor responsible for it. Tensile tests of the blends revealed that notches in any depth have great detrimental effects on the elongation at break of the materials, which is not consistent with the calculated notch sensitivity factor (kS) data.
Gear Application Feasibility Study of Functionally Gradient Material
Authors: Li Qiang , Yang Cong Bin , Zhu Xing Gao , Gao Xiao Dong , Gu Liang
Published: January 2014

The problems of the tooth root bending stress increase,distortion, the life of the gear reduction and other issues existing in the gear heat treatment process, In order to solve these problems, functionally gradient material (FGM) was used on gear working surface. the analysis of heat treated gear performance and common gear performance comparison analysis has maded; A functionally gradient material cylindrical involute gear model and a common cylindrical involute gear model were created, Then finite element calculation of bending stress and analysis of the two models has maded. The FGM gear have better performance on the root bending stress and the hardness of the working surface, and also can avoid disadvantages about distortion and uniform carburized layer which might happened in heat treatment process. The experimental results show that FGM can be used on gear.
All-Solid-States Thin Film Lithium-Ion Micro-Battery with SnOX Films Doped with Cu as Negative Electrode
Authors: Lin Jie , Liu Chang , Liu Qi , Guo Hang
Published: January 2014

For powering various micro/nanodevices and systems, it is necessary to develop a thin film micro-battery with high capacity and outstanding cycle performance. By using radio frequency (RF) magnetrons sputtering, tin oxide thin films used for thin film micro-batteries negative electrode were deposited on silicon substrates. Besides, doping metal impurity Cu was used to improve the performance of the films. The results showed that with the increasing of Cu-doping content, the phase of thin oxide thin films tended from crystalline to amorphous, the capacity of SnOx films increased, and the cycle performance improved. Lastly, LiCoO2/LiPON/SnOx and LiCoO2/LiPON/CuySnOx all-solid-states thin film lithium-ion batteries were prepared with MEMS techniques, and the tests gave the conclusions that with the copper doping in the negative electrode, the capacity of thin film lithium-ion batteries increased, and the batteries showed better circulation property.
Study on Step Type Vibration Tapping of Superalloy
Authors: Han Feng Qi , Li Zhi Zun , Zhang De Yuan
Published: January 2014

Service life of tap is shorter when low frequency torsional vibration tapping is used to tap on superalloy GH4169. The analysis of experimental data show that excessive repeated cutting times and high friction speed result in rapid wear of tap. In order to avoid above unfavorable factors, step type vibration tapping is proposed, which has larger cutting angle, such as 90°, and lower spindle speed. It was proved by experiments on superalloy GH4169 that service life of tap of step type vibration tapping is about twice of that of common low frequency torsional vibration tapping .
Research on Au-Bearing Copper Ore in Flotation from Yunnan
Authors: Tong Xiong , Wang Xiao , Deng Zheng Bin
Published: January 2014

In this study, the main aims were to recovery copper from Au-bearing Copper Ore by flotation. The main mineral is copper with 1.18% Cu and 0.75g/t Au. Same chalcopyrite in fine parts is encapsulated in gangue minerals, and some copper minerals exist as the intergrowth with pyrrhotite and pyrite. After study, the suitable mineral combined processing flowsheet of mixed flotation-copper sulphur separation with stage grinding and stage separation which consisting of one rougher-five concentrate-four scavenging flotation and highly efficient collector YL-3 developed independently,which has not only good selectivity for collecting copper, but also can increase Au recovery have been defined. Under such a condition, the grade of Cu is 13.05% and the recovery of 84.94% with Au 5.96g/t and 60.23% recovery is obtained, which has a better effect.
Numerical Simulation of an U-Channel Component Tailored Tempering Process Considering the Effect of Stress on the Shift of TTT Curves
Authors: Tang B.T. , Wang Q.L. , Bruschi S.
Published: January 2014

A numerical model of the tailored hot stamping process was developed in the framework of the commercial FE code ForgeTM and accurately calibrated in order to take into account the influence of applied stress and strain on the phase transformation kinetics. The calibration was carried out by introducing in the numerical model data on the shift of the TTT curves due to applied stress and the transformation plasticity coefficients, which were obtained through an extensive dilatometric analysis. The numerical model was validated through a laboratory-scale hot-formed U-channel produced using a segmented die with local heating and cooling zones. The predicted distribution of Vickers hardness and evolution of microstructure given by the numerical model was compared with the experimental results to show the significant predictive improvements introduced by considering the influence of the transformation plasticity and deformation history on the phase transformation kinetics.
Microstructure and Mechanical Properties of Welding Joints of High Nitrogen Steel by Hybrid Laser-Arc Welding
Authors: Ma Zhi Hua , Chen Dong Gao , Liu Hong Wei , Yang Wu Lin
Published: January 2014

Hybrid laser-Arc welding was to weld 20 mm thickness high nitrogen austenite stainless steel plates. Microstructure, hardness, mechanical properties and fractography of welding joints were researched. The results showed that the microstructure of heat affected zone and weld metal is austenite and δ-ferrite, and the heat-affected zone of welding joints is Narrow, its softening zone is smaller, the hardness is more uniform, the tensile strength of welding joints is 93.8% of the base material, fractured in the weld zone. The tensile fractography are obviously dimple.
[Omim][Pro] Amino Acid Ionic Liquids as a Corrosion Inhibitor for Copper in 3.5 % NaCl Solution
Authors: Chen Xue Dan , Gong Min , Fu Qing Shan , Zheng Xing Wen , Feng Xue Song
Published: January 2014

The corrosion inhibition effect of the 1-alkyl-3-methylimidazolium proline ([Omi [Pro]) for copper in 3.5% NaCl solution was investigated by using electrochemical methods. The results indicated that: the inhibition efficiency of [Omi [Pro] was more than 90%, which showed the excellent corrosion inhibition performance. The inhibition efficiency increased with increasing concentration of [Omi [Pro], and decreased with increasing temperature, but it changed very little when the concentration arrived at 0.001 mol/L. [Omi [Pro] was a good mixed-type inhibitor which mainly inhibited anodic processes.
Comparative Inspection of Terbufos in Blood from Head Skin by GC-MS
Authors: Xu Jiang Ping , Tao Dai Qin
Published: January 2014

This paper selects a typical poisoning case of pesticide topical on head. Technicians extracted the victim's blood, vomit and swabs, and toxicant tests were under Condition-A and Condition-B. Terbufos ingredients were detected from the blood and swabs, but not found in vomit. Compared Condition-B to Condition-A: it has increased the column efficiency and improved the separation of Terbufos, thereby improving the detection sensitivity of Terbufos. The Condition-B method selects more than one mass fragment peak for scanning, which is of high sensitivity and less impurities interference. While using Terbufos standards for retention time comparison, the results are accurate and reliable.
Research Progresses and Development Trends of High-Efficacy Photocatalysts
Authors: You Wei
Published: January 2014

Progresses of research on high-efficacy photocatalyst were introduced in this paper. Firstly, efficiency-strengthening methods of TiO2-serie photocatalysts were summarized basing on collected literatures, including photosensitization, alloying, moreover, novel photocatalysis materials and technologies and probable development tendencies in the future were introduced, such as broad-spectrum photocatalysts, broad-energy and energy-sensitive catalysts and high-efficacy controllable high-power photocatalysis materials and equipments.
Optimization of Super-Long CNT Forests Growth on Conductive Substrate by Water Assisted CVD
Authors: Wang Peng Bo , Xu De Yang , Sun Li Ning
Published: January 2014

Water assisted chemical vapor deposition (CVD) is used widely to synthesize super long, vertically aligned, densely packed carbon nanotube (CNT) forests. Various water assisted CVD parameters give the important influence on the quality of CNT forests. In this paper, several main parameters in water assisted CVD are optimized, such as the flow rate of H2, the content of water and growth temperature. Furthermore, growth on the conductive substrate is also studied by water assisted CVD. Under optimum condition with 10 minutes growth, the length of CNT forests could be 815 μm on silicon substrate and 369 μm on conductive substrate.
Impact of Structure Design of Artififical Upwelling Tube
Authors: Leng Jin Ying , Chen Jia Wang , Huang Hao Cai , Lin Shan , Liu Ming Zhou , Liu Jun Bo
Published: January 2014

Deep ocean water (DOW) is cold, nutrient-rich and pathogen-free water, which can be transported to the surface by upwelling. Upwelling can change the temperature and nutrient distribution of the surrounding water, hence improves the marine ecological environment and the marine primary productivity. Two lake experiments were accomplished in Qiandao Lake .The first experiment was done with hard PVC upwelling tube, while in the second experiment , the upwelling tubes with different diameters (0.5 m, 1 m, 1.5 m and 2 m) were made of nylon ,which are supported by rings. It can be concluded that upwelling ratio (the ratio of water volume flow rate and air volume flow rate) of the hard PVC upwelling tube was higher than that of soft nylon upwelling tube, and in condition of soft nylon upwelling tube, upwelling ratio of 1 m diameter tube was higher than that of others, providing important guidance for the next sea trial.
The Research of Grouting Sandblasting Carrying Manipulator Based Wax Casting-Line
Authors: Li Ying Jun , Wang Fang , Zhang Qi , Li Chang Cun , He Yong
Published: January 2014

Mechanization and automation are the general trend of Investment casting in the world. The paper briefly discusses the sandblasting process of investment, and introduces the shell casting process. Carrying manipulator design is proposed to complete the investment casting process. The terminal arm and other major components of structural design are discussed. The terminal clamping structure is modeled. The parameters of the terminal clamping structure are designed. The research can provide some reference for the development and design of grouting sandblasting carrying manipulator based wax casting-line.
A Damage Model for Low Cycle Fatigue Analysis of Stiffened Plates
Authors: Dong Qin , Yang Ping , Deng Jun Lin , Wang Hong
Published: January 2014

A low-cycle fatigue damage model for stiffened plates has been derived based on the theory of damage mechanics. The fatigue damage variable equation of the stiffened plate under cyclic loading was introduced into the accumulative plastic strain equation. Then by means of integral transformation, the evolution equation of axial plastic strain was derived under low cyclic loading condition. The analysis results by the presented model compare well with those by the finite element method.
Analysis of Fatigue Life in High Temperature of W Pattern Sealing Rings Used in Aircraft Engine
Authors: Chen Xi , Wang Yun
Published: January 2014

sealing rings used in aircraft engine are surrounded by high-temperature gas and cyclic loading when they are working. The reliability of its work directly affect flight safety and engines life. This paper framed some kind of W pattern sealing rings finite element models with different sectional structure size, first analyze them strength of structure in specific conditions, then simulate the fatigue life of them by using analysis methods of fatigue and parameters of fatigue test, finally we can get damage contours and fatigue life in high temperature of W pattern sealing rings theoretically, providing some theoretical reference of designing and manufacturing sealing rings.
The Review of Workpiece Loading and Unloading Robot in the Catenary Shot Blasting
Authors: Li Ying Jun , Sui Peng Jie , Zhang Qi , Li Chang Cun , He Yong
Published: January 2014

Industrial robots with advantages of highly flexible, high positioning accuracy, high-efficient production, continuous operation capability in the harsh environment, can effectively replace all kinds of complex operations and high-intensity labor which cant be completed by the existing manual operation. The structural characteristic and use of the catenary abrator is described in this paper. Based on the current production status, catenary shot blasting machine workpiece handling methods are elaborated. This paper describes the use of the robot which can work quickly and efficiently loading and unloading.
Study on Modal Analysis for Motorcycle Frame by CAE Method
Authors: Wang Jing , Wang Yong , Liao Ying Hua
Published: January 2014

In this paper, the modal of motorcycle frame is analyzed by using the analytic method and experimental method. The results show that the dynamic properties of the finite element model are in good agreement with the experiment and the finite element model was reliable and accurate.
Structural Optimization Design of Body of Oil-Perforating Gun
Authors: Zhao Ming Ju , Zhu Gong Zhi
Published: January 2014

In the design of structure of oil perforating gun, for on the depth of perforating gun blind hole diameter, and the gun body wall thickness design is the key technology, through the introduction of optimization design technology, under the condition of satisfy the use requirement, language APDL of ANSYS software parametric optimal design of several data, the minimum wall thickness can get a gun. And on this basis, the blind hole diameter and depth was studied the influence of the strength of perforating gun. Conclusion shows that with the increase of blind hole depth, blind hole gun gun with blind hole part of the equivalent stress increased significantly, the strength of the blind hole depth of perforating gun has a great influence, and the intensity of blind hole diameter has little effect.
Strength Analysis and Optimal Design on Flip Axis of Steel Roll Clamp
Authors: Wang Feng Hui , Han Wei
Published: January 2014

Turn coil clamp is an important auxiliary equipment of steel rolling production in iron and steel enterprise. At present, although the clamp has been put into production use which can satisfy the basic needs of enterprise. Its production efficiency and security still need to be improved. Based on the above case, this time a new steel coil clamp that is researched can greatly improve efficiency and safety. To make the structure more reasonable, the double shaft which is one of the main stress components is needed analysis and optimal design.
Design of Impeller of Centrifugal Compressor for Water-Air Engine
Authors: Wang Yun , Zhang Wei
Published: January 2014

In view of power system in water-air UAV requirements, combine with the centrifugal impeller for aero-engine and the pump impeller. The design of a impeller of centrifugal compressor can work on the air and in the water for the new concept of air-water engine. With 3D design and a 3D CFD solver on it and analysis the results of numerical simulation. Results show that the designed impeller successfully reached the goal on the air and in the water. The experiences accumulated in this procedure are useful for similar impeller aerodynamic designs.
Suspension Parameter Design Based on Equivalent Linearization Method
Authors: Li Jiong , Jia Xiao Ping , Yu Kui Long , Zhang Lei
Published: January 2014

The equivalent linearization method to calculate the stiffness parameters of the elastic element and damping parameters of the vehicle suspension is presented in this paper. With the virtual work principle, the nonlinear characteristics of the suspension are analyzed. The stiffness and damping of the suspension element based on the vibration response of the vehicle ride comfort are calculated. The numerical computation results of a double wishbone suspension with torsion bar show the presented method is feasible and effective.
Structure Design and Simulation of Lithium-Ion Battery Casing Machine
Authors: Xia Qin Xiang , Ji Liang Bo , Li You Xiang , Liu Xiu Juan , Li Zhi Wei , Huang Cheng Long , Huang Yong
Published: January 2014

Considering the self-structure of lithium-ion battery and features of lithium-ion battery casing machine, the detailed design and analysis were carried on the components of lithium-ion battery casing machine. The motion simulation and finite element analysis were conducted by ADAMS and MARC software. The results show that the structure is practicable and the design is reasonable.
The Profile Error Feedback Optimization for the Design of a Showerhead System Controlling Gas Flow Uniformity in a Thin-Film Reactor
Authors: Xia Huan Xiong , Xiang Dong , Mou Peng
Published: January 2014

The design of a vector showerhead in a vertical reactor involves thousands of holes on the showerhead face plate and mass transport in the reactor, and the design variables and objective are always spatial related continuous characteristic, so the discretized sequence of the design variables has too many degrees of freedom that the needed sampling points of a design of experiment or heuristic algorithm methods are hardly acceptable. In order to solve this problem, a profile error feedback (PEF) optimization method was proposed. This method employed a loop-iteration-approximation mode, and started from a guessed initial model, and then fed back the profile error of design objective, according to a weight function, to continually adjusted the design variable sequence to make the gas flow uniformity in the new model continually approximate the perfect one. The optimization case of a vector showerhead system shown that the non-uniformity of the gas flow was reduced from 0.36% to 0.03% under a typical process condition.
Analysis of Structure Characteristics and Improvement of Turbo-Supercharger Bearing
Authors: Gan Hui , Yang Kun Yu , Yang Xiao Liang
Published: January 2014

The reliability of the gas turbo-supercharger can be affected by the faults such as the cauterization of the floating bearing of the supercharger, the carbonization of the rotor and getting stuck, the deformation of the blade and heat cracking of the nozzle ring. The design scheme is proposed by using friction bearing taking the place of the floating bearing, because the main reason of the cauterization of the bearing is the increase of the inside clearance of the floating sleeve, which is testified by the actual rpm measurement of the floating sleeve on the floating bearing and the adjustment test of the inside and outside clearances of the bearing. The experimental study on the structural characteristics of turbocharger bearing effectively prevents turbo-supercharger floating bearing from being cauterized, solves the problem of thermal fatigue damage, and improves turbocharger reliability.
Surveillance Ship with Fuel Cell Performance Analysis and Design
Authors: Kuan Yean Der , Chang Jing Yi , Huang Min Shiang , Chu Yen Yao , Chen Yan Ci , Huang Hong Lin , Huang Guan Shiuh
Published: January 2014

The main content of this paper is to design and fabricate a type of surveillance ship with a proton exchange membrane fuel cell (PEMFC), which adopts hydrogen as fuel cell to generate electricity to drive the surveillance ship. This ship has devices of reconnaissance, lighting, shooting. The reconnaissance device could return real-time images to the command center via cloud technique which could understand the current situation of the reconnaissance location. A buoyancy device is designed into the hull to enhance the stability of running. This paper starts from the functional design and system evaluation, then conducts the fabrication and assembly of the surveillance ship, and finally makes the electric integration and the tests of the PEMFC, surveillance ship running, and hydrogen consumption. The results of the research shows the developed surveillance ship has the advantages of low pollution, clean energy, no effect of day and night, and could be driven via only a small amount of hydrogen, which meets the trend of environmental protection and has the potential of applications in the future.
The Improved Structure of Swash Plate Axial Piston Pump
Authors: Dong Chao , Zheng Wei Gang
Published: January 2014

in order to change China's shipbuilding capacity continues to rise, while the ship equipment localization rate decreased and the situation of reality , the national defense science and Industry Committee put forward the strategic planning of shipbuilding, coordinated development. Marine auxiliary is the largest number, the most species of ship equipment. Based on the analysis of structural weaknesses of the previous ship swash plate axial piston pump, designed a kind of improved fixed swash plate axial piston pump
Modeling and Computational Analysis of Diesel Engine Working Process in Plateau Environment
Authors: Wang Xian Cheng , Li Ruo Ting , He Xing , Hu Jun Biao
Published: January 2014

Using simulation software, numerical simulation and plateau tests are combined to create the plateau diesel engine process simulation model. External characteristics tests of the diesel engine, plateau simulation experiments and plateau vehicle tests are combined to verify the model. The maximum deviation of the results is less 10%. The simulation model is accurate, which provides a way to study plateau environmental adaptation of diesel engines.
Process Analysis of Oblique Gibs
Authors: Liu Xin Ping
Published: January 2014

Through analyzing the structure feature of long oblique strip and requirement of machining precision, We introduce a new means of planing to ensure the quality of work-piece. By studying process feature of long oblique strip , Give the method of designing clamping apparatus for planing.
The Effect of the Pressure Drop Ratio on the Performance of a Novel Dynamic Hydrocyclone
Authors: Li Gao Sen , Chen Jia Wang , Xu Chun Ying , Zheng Bing Huan , Yuan Zhuo Li
Published: January 2014

In this paper, a novel dynamic de-oiling oil-water separator was proposed, and through Computational Fluid Dynamics (CFD) simulation, the effects of the pressure drop ratio on the separation efficiency and the split ratio were analyzed. The results shows that the separation efficiency initially increased and then held steady as the pressure drop ratio increased, while the split ratio exhibited an approximately continuous linear decrease. Moreover, an optimal combination of properties could be obtained when the pressure drop ratio was set at a specific value, wherein both the separation efficiency and the split ratio worked advantageously.
The Finite Element Analysis of Derrick Translation System in Vehicular Pressure Balance Workover Rig
Authors: Yan Ming Yin , Li Cheng Yang , Jin Jia Qi
Published: January 2014

Nowadays the workover rig is more often used in outdoor work, and the field environment is complicated and changeable.Therefore, it becomes extremely important to conduct a detailed analysis of stress of the workover rig derrick translational system.This paper takes Liaohe Oilfield new vehicular pressure balance workover rig derrick translation system as an example, a finite element analysis model is established to analyze the stress conditions of the derrick truck system.The result completely conforms to the actual requirements, thus verifying the rationality of the design and providing the basis for the optimization design of the translation system.
Simulation Analysis and Studying of Die Casting Forming Process for Crankcase
Authors: Zheng Wei Gang , Liu Zhi Jun , Yang Ning , Li Chun Long , Yang Xin
Published: January 2014

In recent years, with the rapid development of automobile, the production of complex parts adopt the die casting process such as crankcase box. the stress of market competition make greater demand on Casting Products quality, such as the organizational structure of products has no shrinkage porosity defect and has good mechanical properties. this articles simulation analysis of die casting forming process for Box are based on software AnyCasting, analyzing the reasons of air trapping from the filling process, Solidification sequence, Residual melt modulus. and it can conduct local extrusion feeding towards location of shrinkage porosity. By analyzing the metallographic structure we known that Local pressurization could refine Casting organization grain and make the grain more dense.
Research on the Pulse Current Distribution of the Hollow Cylinder Surface
Authors: Wang Tao , Zhou Bi Hua , Li Wan , Ding Ya Fei , Li Yan Xin , Yang Bo , Fu Ya Peng
Published: January 2014

For analyzing the distribution of the pulse current on the hollow cylinder surface, different pulse currents distribution characteristics of hollow metal cylinder surface are simulated by CST (Computer Simulation Technology) software. The results show that, different pulse currents injected in the cylinder submit to the same distribution basically; the difference in the length or the thickness of the cylinder have no significant effect on the current distribution, but the distribution changes greatly as the external diameter changes. The work in this paper provides a reference to analyze the lightning pulse current distribution of high tower building surface.
The Mechanical System Structure Design and Kinematics Analysis of the Bipedal Humanoid Robot Leg
Authors: Cui Deng Qi , Xin Hong Bing , Liu Long , Wang Tan , Xin Yue Fei
Published: January 2014

In the study of humanoid robot, the system design and analysis of the legs is the foundation of realizing humanoid walking robot. In this paper, structure design of each leg joint has been introduced, and according to the degrees of freedom of each joint distribution, using screw theory and exponential product formula to establish the mathematical model of the legs, to analyze the kinematics of the legs, finally obtains that the range of joint movement comply with the design requirements.
The Design of Flexible Bearing Life Test Device
Authors: Liu Long , Xin Hong Bing , Cui Deng Qi , Xin Yue Fei , Wang Tan
Published: January 2014

The flexible bearing break is an important factor to influence the life of harmonic drive, this paper first introduces the research situation of fatigue fracture above this the design of flexible bearing fatigue life test device of the no-load and load conditions. The device includes a driving part, a loading device, the break device and the monitoring device of bearing`s revolution when it break.
Analysis of Off-Design Flow Field and Prediction of Performance in Hydraulic Turbine
Authors: Shi Feng   Xia , Yang Jun  Hu , Wang Xiao   Hui
Published: January 2014

Two models of hydraulic turbine based on pump in reversal were simulated. Pressure distribution of flow field in Variable conditions was analysed and external characteristic was forecasted for hydraulic turbine. It was shown: the head increased with flow increased, with increasing of flow rate, efficiency first increased and then decreased. Compared with the turbine with a guide vane, the head of two models was almost equal, but the disparity of efficiency was large, and the efficiency of hydraulic turbine with a guide vane above on the efficiency of hydraulic turbine without guide vane. Pressure pulsation was existent in runner inlet. From runner inlet to runner outlet, the pressure distributed evenly from high to low. Added with a guide vane, the pressure distribution was more evenly than before and the Amplitude of pressure fluctuation decreased.
Sheet Polymeric Iron (III) Porphyrin Complexes Catalytic Oxidation of Styrene with Molecular Oxygen
Authors: Li Xido Dong , Wang Xiao Feng , Zhu Yuan Cheng , An Mei Mei
Published: January 2014

The sheet polymrtic iron (III) porphyrin complex [PFe (III)TPP] was prepared and charactrtized by FT-IR, TG-DTA and DTG, SEM and XPS. It was applied to catalytic oxidation of styrene with molecular oxygen and exhibited excellent catalytic activity. The results showed that the conversion reached to 50.5% in mild concitions, the major products of benzaldhyde (65.2% at 90°C) were obtained, and the catalyst could be efficiently reused five times.
Gas Storage Cavity Simulation Experiment Research and Application
Authors: Wan Ji Fang , Shen Rui Chen , Ji Zhong Yuan , Xie Jing Bin
Published: January 2014

The real salt cores from drill-site was regarded as the prototype in this experiment. They are used to simulate solution mining process of salt caverns. In this paper the mathematical model of solution mining wasset up.Experimental parameters are obtained by similarity ratio. Afternumerous experiments on the artificial salt rock model,the results show that thecontrol experimental parametersand the references design are effective.This researchhas some guidance on field engineering of solution mining construction.
Structure Optimization Design of Vane Steering Pump
Authors: Yang Lian Fu
Published: January 2014

How to reduce or eliminate the noise of the vane steering pump is a key problem to use hydraulic power steering car to solve. After a lot of experiments and demonstration, the methods of adopting correct transition curve, and a large circular arc method, adopting low noise impact curve of eight times optimization design, and the advanced stator curve fitting method, are to be good solutions to the problem of the vane steering pump noise.
Research for Breaking Explosives Green Safe Technology and Advanced
Authors: He Fei , Meng Fan Jun , Lai Li Guo , Zhang Yun He , Hong Rui , Gao Jun , Yang Hao , Chao Hui Jun
Published: January 2014

this article do research in explosive broken problem, using the triple differential of the explosive roll type crushing technology to realize safe automation, take man-machine isolation operation measures, effectively reduce the labor intensity of workers, improve working environment ，ensure the personal safety and broken after medicine block size and crushing efficiency, it have high safety and reliability, certain promotion value, laid a solid foundation of technical innovation for the military and civil industry.
Discussion Based on the Condition of Transformer Parallel Operation
Authors: Yan Xiao Qing , Ruan Yun Lan , Cao Fei
Published: January 2014

When three-phase transformer runs parallel, power supply reliability can be improved effectively , and the number of transformer running parallel can be adjusted according to the size of the load ,which can improve the operation efficiency of the whole, in addition, it reduce the loss of transformer effectively, so as to improve the economy of power supply, but the two transformer works at the same time, they must meet the same ratio、connecting groups、per-unit value of short-circuit impedance and short-circuit impedance angle as the three conditions. This paper based on the principle of the parallel operation of transformers gives the corresponding theoretical basis. The conclusion shows that the parallel transformer which satisfies the above three factors can run normally.
Quantitative Assessment on Blast Effects of the Boiler BLEVE
Authors: Qu Fang , Tian Hong , Zheng Qiu Yu , Zheng Yu Liang
Published: January 2014

The boiler BLEVE is accompanied by highly destructive blast waves and flying fragments, whose damaging effect is reflected in casualties and property losses. Thus, the quantitative assessment of a boiler BLEVE consequence, especially for the blast effects, is fairly helpful to prepare contingency plans and review the overall layout and design. The paper presents the mechanism of the boiler BLEVE blast, the consequences, and the methodology to realize the reasonable evaluation, which can give a quantity of guidance to classify and take some safety countermeasures to supervise the boilers.
Experimental Research for the Soft Soil Foundation Reinforced by Vibro-Replacement Stone Pile
Authors: Hu Hai Ying , Zhang Yu Cheng , Huang Zhi Xing
Published: January 2014

With the background of the foundation treatment engineering of a river dam in a reservoir, the thesis introduced the site experiments for soft soil foundation reinforced by vibro-replacement stone piles. Moreover, the study had also conducted inspection and analysis of the reinforcing effect of the composite foundation being reinforced by vibro-replacement stone piles including the inspections like the stress ratio between the vibro-replacement stone pile and earth among pile and the ratio between the vibro-replacement stone pile and the pile earth. Finally, the study came to below results after comprehensively considering the results of the heavy dynamic penetration test, standard penetration test, load test, reading of earth pressure cell and etc. The reinforcement of the vibro-replacement stone piles could reach the expected reinforcement effect for the soft earth foundation. After the application of the piles, the carrying fore of the composite foundation is higher than the design requirements and the liquefaction resistance has experienced significant improvement. Moreover, this kind of composite soil foundation could effectively reduce the total settlement of the foundation, accelerate the consolidation of the foundation and improve the hydraulic conductivity of the foundation.
Effect Evaluation of Web Reinforcement of Continuous Rigid Frame Bridge
Authors: Li Ping Jie , Dai Yu Wen , Li Guo Bao , Wei Ming Hui
Published: January 2014

Based on a prestressed concrete continuous rigid frame bridge reinforcement project, the finite element model of the bridge was established, which includes two kinds of work condition of before and after bridge reinforcement. The finite element model had analyzed the change of natural frequency, deflection and bending stiffness after the web reinforcement of a prestressed concrete continuous rigid frame bridge, in which we have got analysis results that web reinforcement bridge deflection is less than before reinforcement, and the changing law is obvious as inversely proportional relationship, at the same time, the changing law of natural vibration frequency of web reinforcement bridge and original bridge is not obvious, so only deflection but natural vibration frequency can effect evaluation of web reinforcement of continuous rigid frame bridge.
Experimental Research on the Behavior of Adhesive Reinforcement under Pullout Load
Authors: Shi Li Zhong , Zhang Jian Rong
Published: January 2014

This paper reports the experimental results of 5 groups of 18 adhesive reinforcement bars in concrete under pullout load. Through observing the experiment process, measuring the characteristic loads, and analyzing the failure mechanism, the behavior of adhesive reinforcement under tensile load is studied and described. Based on the tests and previous findings of other researchers, the five failure modes observed for adhesive anchors can be summarized.The formula to calculate the ultimate strength and some design suggestion are also presented.
Behavior of Two-way RC Slabs Combination Strengthened with CFRP Strips and Steel Sheets
Authors: Li Xiao Jin , Lu Yi Yan , Li Na
Published: January 2014

A total of four two-way reinforced concrete slabs strengthened with three methods were tested. The four test specimens were one unstrengthened reinforced concrete slab (control), one slab strengthened with CFRP strips, one slab strengthened with steel sheets, and one slab strengthened with an innovative method of applying CFRP strips and steel sheets combination bonding to the tension face of the slab. The test results show the CFRP-Steel combination strengthened technique is a rapid and effective strengthening technique for two-way RC slab. The increase in ultimate capacities of CFRP-Steel combination strengthened slab is 221.1% over the control slab, 84.4% over the CFRP-strengthened slab, and 45.2% over the steel-strengthened slab. In addition, the CFRP-Steel combination strengthened slab exhibited superior ductility than the CFRP-strengthened slab.
Experimental Study and Numerical Simulation for Explosion and Phenomena of RC Slabs
Authors: Wu Hong Xiao , Xing Hao Zhe , Yan Zhi Fang
Published: January 2014

The blast impact dynamic experiment of reinforced concrete rectangular plate with simply supported boundary conditions was performed using explosion pressure simulator. With 3-D FEM software LS-DYNA, the separate solid models of concrete and steel were established and 3-D FEM dynamic analysis of the experiment process was carried out. Compared calculation results to experiment results synthetically, the damage mechanism and failure characteristics of reinforced concrete plate under explosion impact loading condition were got and it is also verified that the H-J-C model can approximately simulate the concrete properties well under explosion impact loading condition.
Iterative Prediction on Friction Loss Parameters of Prestress Tendon
Authors: Guo Qi
Published: January 2014

Because of the more sophisticated fiction loss for prestress of space curve tendon than that of the beeline one. The key parameters in the attrition loss for space curve tendon are predicted and regularities of practical distribution can be simulated in this paper simultaneously, by means of the iterative method based on the attrition loss for prestress test of a long-span continuous rigid frame bridge. The predicted parameters can also provide some reference in the calculating the attrition loss for prestress of the space curve tendon in other bridges.
Analytic Method of Stability of Rigid Frame Bridge with Double-Limb Thin-Walled Piers
Authors: Wang Xiu Lan , Chen Wen Qiang
Published: January 2014

Based on the stability theory of column ,this paper did research on the solving methods of buckling eigenvalue when the rigid frame bridge was subjected to dead load . When solving the critical failure force, you could consider the height of piers as the effective height, consider the sum of the loads of upper structure and half of the weight of the piers as the equivalent buckling loads. Finite element model was created for verifying the solving method introduced in this paper. The results shows that in the maximum cantilever phase , the calculation error of buckling eigenvalue was decreased as the height of piers was increased ; the method in this paper was more accurate on the completed bridge stage . When the height of two piers was different, you can calculate each piers buckling eigenvalue, the buckling eigenvalue of the whole bridge was the average of every pier.
Reasonable Overburden Depth Analysis of Close-Frame Structure in Airport Project
Authors: Teng Qi Jie , Wu Song Hua , Zhang Liang
Published: January 2014

The close-frame is the main structure type of underground passage in airport project. Its characteristics are long route, multi-zone crossing, heavy load capacity. The suitable thickness of covering soil is advantageous to structure. Therefore, it has important engineering significance in guiding structural design and to determine the optimal route longitudinal section with reasonable economic overburden depth. Double-span close frame bearing Class E aircraft load is discussed in detail about reasonable soil depth.
The Study on Dynamic Mechanical Response under Staged Loading
Authors: Luo Fei , Zhu Zhan Yuan , Cui Lin Zhi , Li Gao Min , He Yi Ting
Published: January 2014

Based on MTS-810 type vibration testing machine, morphological characteristics of hysteretic curves of frozen clay are quantitatively studied, and dynamic mechanical response are analyzed consisting of stiffness, viscosity, degree of microscopic damage, residual strain and energy dissipation. The studies have shown that the higher vibration frequencies are, the greater the stiffness is, while the smaller viscosity, the degree of microscopic damage, residual strain and energy dissipation are. Stiffness, viscosity, degree of microscopic damage, residual strain and energy dissipation are less affected by confining pressure. With increasing dynamic stress amplitude, stiffness decreases gradually, while viscosity, degree of microscopic damage, residual strain and energy dissipation increase gradually.
Study on Cable Force Optimization for Extradosed Cable-Stayed Bridge under the Rational Completion Stage
Authors: Wang Xiao Lei , Liang Tian , Qi Tie Dong
Published: January 2014

The extradosed cable-stayed bridge is a new type of bridge developed in recent year. The optimization methods commonly used are based on the cable-stayed bridge and not entirely suit for the extradosed cable-stayed bridge. The paper puts forward a new optimization method, which applies the unknown coefficient functions aided by MIDAS/CIVIL, it takes the reasonable feasible range of dead moment solved by stress balanced method as the constraint condition, makes the square of unknown coefficients as objective function, and solves the cable force based on the effect matrix method thus to determine the cable force in reasonably completion state. This new method is verified with favorable effect, the internal force of this structure appear significant improvement. And finally, the results show better cable force obtained under the method in this paper compared with the cable force under other constraint conditions and objective functions.
Failure Process Simulation of Highly Jointed Rock Slope with a Fault
Authors: Nian Ting Kai , Zhang Yan Jun , Zheng Lu , Liu Kai , Chen Guang Qi
Published: January 2014

This paper uses 2D DDA program to simulate the failure process of highly jointed rock slope with a fault. In addition, seismic forces, as a most common triggered factor of landslide, are also simplified simulated by applying an initial velocity to the slope. Based on the simulation results, the weakest discontinuity, fault, determines the slide path of rock blocks; the accumulation of blocks' displacements leads to the overall failure of slope; and the existence of highly developed joints provide the possibility of the accumulation of displacements.
An Investigation of Diseases of Concrete Filled Steel Tubular Arch Bridge in Guangxi
Authors: Lin Chun Jiao , Chen Jia Hai , Gu Zhen , Fu Geng En
Published: January 2014

This paper studies the diseases of the Concrete Filled Steel Tubular (CFST) arch bridges in Guangxi. More than 10 CFST arch bridges have been built in this region in the past 20 years, and now some of them are working with diseases. According to the investigation, the diseases of the CFST arch bridge including structural diseases, materials diseases, environmental diseases and other typical integrated diseases are caused by different reasons. It is suggested that more measures should be taken to prevent the emergence of new diseases and further development of existing diseases.