bluuebunny/crossref_metadata_2025 huggingface dataset:
The Analysis of the Influencing Factors about Friction and Wear Characteristics of the Piston Ring in Stirling Engine
Authors: Yang Dong Ya , Xie Huan , Gong Jun
Published: May 2013

The problem about friction and wear characteristics of piston ring which is directly related to the sealing properties of stirling engine was analyzed. An improved seal structure of piston ring was taken as the research object, the influence of the temperature and the pressure of refrigerant were considered when the friction and wear characteristics of piston ring in stirling engine was studied. The calculation formula about radial weal amount of the piston ring with the change of the temperature and the gas pressure was derived by using the peeling wear theory. Then, the experiment was taken to confirm these formulas. The results show that the formulas were right. Hence, a viable way to analysis the sealing properties and life prediction method of piston rings was got.
The Effect of Friction Coefficient on Fretting Fatigue Cracks
Authors: Guo Tao , Wu Liang , Liu Xiao Nan , Guo Ran
Published: May 2013

The riveting is widely used for fitting together two or more components of structure in the same or different materials. And mechanics characteristic is very complex. The paper work focus on study fretting fatigue crack formation with different friction coefficient and fatigue loading, by analyzing the stress field of upper hole edge and outer boundary of contact area. And comparing with the experimental, founding the risk point of single bolt riveted aluminum components.
Research on the Reinforcement Mechanism of Stretched Rock Bolt and Analyzing of the Impact Parameters
Authors: Zhu Xun Guo
Published: May 2013

The rock bolt has been widely used as an effective reinforcement in civil and mining engineering for a long time. However, the anchored mechanism of it is not well understood. This paper obtained the expression of the shear stress and axial force of stretched fully grouted rock bolt base on previous working, and detailed analysis the influence parameters of stress distribution. It is considered the anchored effect is influenced by some factors. Augmenting diameter of rock bolt, increasing the pre-stress magnitude and improving the strength of grout may all improve the anchored effect of rock bolt. As the rock character and the grout property are similar, the rock bolt anchored effect is optimal. There is a stress concentrated phenomena at the front of rock bolt. It is shown that the distribution of shear stress and axial force are not even distribution and exponentially attenuated along a fully grouted bolt.
Beneficiation Study on an Oolitic Hematite
Authors: Sun Jie , Zhang Jin Zhu
Published: May 2013

The oolitic hematite with a lower iron content and a higher phosphorus content will be a potential source of raw iron ore for the Chinese iron and steel industry. The magnetization reducing roasted and magnetic separation is a practical beneficiation process. The results show that the iron content in the concentrate can be increased to 57.63% from 45.95%, the iron recovery up to 73.12%, when the parameters are as follows, the roasting temperature is 900°C, the residence time 70 min, the ratio of reducing agent 5%, the grinding time 7 min, and the magnetic field strength 0.15T. The phosphorus content in the concentrate can be reduced to 0.23% from 0.39% by means of acid leaching.
Comparison Research on Mechanical Properties of Stainless Steel after Laser Peened and Ultrasonically Peened
Authors: Wang Cheng , Lai Zhi Lin , Sun Dong , Zhou Liu Cheng , An Zhi Bin
Published: May 2013

The mechanical properties of 1Cr11Ni2W2MoV stainless steel after laser peening (LP) and ultrasonic shot peening (USP) were examined and compared. The stainless steel specimens were treated with the two different surface processing techniques. X-ray diffractometry (XRD), scanning electron microscope (SEM), microhardness tester were used to investigate microstructure and mechanical properties. Vibration fatigue tests of untreated, LPed and USPed samples were also conducted. The results indicated that LP treatment can improved the fatigue life of 1Cr11Ni2W2MoV stainless steel more effectively. The increases of the compressive residual stress depth and microhardness in surface layer after LP were greater than that of USP. The SEM studies showed that USP treatment had an advantage in microstructure refinement. The compressive residual stresses make great contributions to the superiority of LP in the improvement of fatigue life of 1Cr11Ni2W2MoV stainless steel to USP.
Effects of Carrier Gases on the Microstructures and Properties of Ti Coating Layers Manufactured through the Cold Spraying
Authors: Lee Myeong Ju , Kim Hyung Jun , Oh Ik Hyun , Lee Kee Ahn
Published: May 2013

This study investigated the effects of carrier gases (He and N2) on the microstructure and properties of Ti coating layers to manufacture high-density Ti layers using the cold spraying. Cold spray coating layers manufactured using He had denser and more homogenous microstructures than those produced using N2. Layers manufactured using He gas showed porosity of 0.02% and hardness of 229HV, which are better properties than the porosity (0.4%) and hardness (177HV) of N2 coating layers. The bond strength of coating layers manufactured using He recorded higher value of 74.28MPa than that manufactured using N2. This could be attributed to the fact that, when coating layers are manufactured using He gas, the powder can be easily deposited because of its high particle impact energy, facilitating the plastic deformation of the particles.
Preparation and Cutting Performance of YT15 Cemented Carbide Tools with Ti (C, N)/Al2O3 Composite Coating
Authors: Gao Yu Xin , Zhang Guang Liang
Published: May 2013

The Ti (C, N)/Al2O3 composite coating was prepared on surface of YT15 cemented carbide by using electro-spark deposition process. The surface morphology, energy spectrum analysis and microhardness of the coating were investigated, and the cutting forces and wear resistance of the tools with and without Ti (C, N)/Al2O3 composite coating were studied by cutting tests. The results show that the microhardness of the YT15 cemented carbide with Ti (C, N)/Al2O3 composite coating increased 181Hv, and the coating tools had better wear resistance and lower cutting force.
Effect of Abrasives on the Lapping Performance of 6H-SiC Single Crystal Wafer
Authors: Li Wei , Yan Qiu Sheng , Lu Jia Bin , Pan Ji Sheng
Published: May 2013

In order to remove the cutting marks on the cutting surface of 6H-SiC single crystal wafer, experiments were conducted to investigate the effect of the abrasive characteristics (types, grain size, concentration and mixed abrasives) on the lapping performance of 6H-SiC single crystal wafer, then the removal mechanism of the abrasive grains in the lapping process was studied. Results indicate that the abrasives with larger grain size and higher hardness can result in a higher material removal rate while the abrasives with smaller grain size and lower hardness can achieve a lower surface roughness value. When the concentration of the abrasives is 7.69 wt%, a good lapping effect was obtained. Lower surface roughness value Ra can be obtained with a high material removal rate by using certain proportion mixed abrasives. Selecting appropriate abrasives can obtain a high surface quality of 6H-SiC wafer with a high efficiency.
Fabrication and Characterization of Magnetic Polymer ICF Target by the Electroless Plating
Authors: Cui Shao Bo , Lu Zhong Yuan , He Feng Wei
Published: May 2013

The magnetic polymer ICF targets are fabricated by depositing the Ni-P coats on the surface of polystyrene microsphere using the electroless plating. The microstructur of the coat, and the magnetic property, surface roughness and sphericity of the magnetic microsphere were examined and analyzed, resperctively. The results indicated the examined indexes can basically meet the requirements of ICF targets.
Effects of Surface Roughness Microtopography on Formability in Cold Rolled Steel Sheet
Authors: Tang Jing
Published: May 2013

The surface roughness morphology of cold rolled sheet treated with three coarsen processes, including shot blasting texturing, electro-discharge texturing and laser texturing, was examined and analyzed before and after stamping. The influence of the micro-topography on the plastic deformation behavior during forming was then discussed. The results revealed that the sheet with uniform dispersion micro-pit, large concave valley and smooth convex hull exhibits a good forming performance.
Investigation on over-Spray Powder of Spray Formed Al-22Si-5Fe-4Mn-3Cu-1Mg Alloy
Authors: Kang Fu Wei , Li Hai Chao , Jia Yan Dong , Sun Jian Fei , Zhang Xin Hong
Published: May 2013

Al-22Si-5Fe-4Mn-3Cu-1Mg alloy billet was prepared by spray forming processing, and the morphology and microstructure development of the over-spray powder were investigated in this paper. The results show that the diameter of the most powder was about 38um. With the decreasing of the powder size, its shape became more round and surface more smooth. Heterogeneous nucleation was the main nucleation way and the microstructures were dendrite grains for the most of over-spray powder. The formation mechanisms of the different microstructures were investigated through comparison with the microstructure of the spray formed ingot.
Hot Ductility Behavior of 800MPa Ultra High Strength Niobium Containing Steels
Authors: Li Qing Shan , Zhang Mei , Huang Chao Bin , Wu Ru Yi , Zhao Xue , Zhong Yong , Li Lin
Published: May 2013

The hot ductility behavior of 800MPa ultra high strength niobium containing steels has been investigated with Gleeble3500 hot simulator. Tensile test was carried out at 650°C1300°C at a constant true strain rate of 0.001 s1. Experimental results showed that steel A has quite well ductility, and the brittle zone is narrow. Due to pro-eutectoid ferrite film formation along the prior austenite grain boundary at 650°C-750°C, samples showed a loss of hot ductility, and the fracture morphology of the specimens was brittle intercrystalline fracture, indicating the third brittle zone of the steel. However, the third brittle zone can be avoided during continuous casting, if the temperature of straightening could be kept over 800°C.
The Effect of Pre-Strain and Strain Aging on Properties of X100 Line Pipe
Authors: Ma Qiu Rong , Chen Hong Da , Li Yan Hua , Li He
Published: May 2013

Tensile and impact toughness test on X100 line pipe with different pre-strain at different aging temperature were conducted to study the effect of pre-strain and aging temperature on properties of X100 line pipe. The result shows that yield strength and tensile strength of X100 line pipe would increase significantly with the introduction of pre-strain, while the impact toughness would decrease significantly. Effect of strain aging on tensile properties of X100 line pipe are more significantly. The yield strength, and tensile strength would increase significantly with the introduction of strain aging both transversal and longitudinal direction.
Investigation of Effective Parameters of Spring-Back in CK67 Steel Sheet Metal Using Finite Element Method
Authors: Soleimani Darinsoo Samaneh , Zoghi Shal Hamed , Khamedi Ramin
Published: May 2013

Accurate prediction and controlling of spring-back within acceptable tolerance limits is absolutely essential for the design of bending die in order to produce sheet metal parts. This phenomenon which is defined as elastic recovery during unloading is one of the most important factors to influence the quality of sheet metal forming. This paper presents a study of spring-back in V-bending process of an isotropic CK67 steel sheet. In this investigation, in order to study the effects of significant parameters on spring-back, numerous simulations are performed using Finite Element Method (FEM). A two dimensional finite element model is developed using ABAQUS/Explicit intending to carry out a comprehensive study and prognosticate spring-back with variable parameters including punch load, punch tip radius (R p) and thickness. Numerical results obtained from the simulations are discussed in details in several diagrams. These results represent verifiable and practical data that are in line with the results of previous researchers.
Parameter Optimization of the Injection Molding Process for a LED Lighting Lens Using Soft Computing
Authors: Chen Wen Chin , Wang Li Yi , Huang Cheng Chi , Lai Tung Tsan
Published: May 2013

This study proposes a parameter optimization system for a multi-LED lighting lens, which uses design of experiment (DOE) for screening the process parameters, computer-aided engineering (CAE) for mold flow analysis, analysis of variance (ANOVA) for determining the significant parameters, and response surface methodology (RSM) for finding the initial parameter settings in terms of multi-objective quality characteristics. In addition, two regression models, obtained from RSM, are employed as the quality predictors which are combined with the particle swarm optimization (PSO) to generate the optimal molding parameter settings. The numerical results show that the proposed approach, RSM with PSO, is beneficial to obtain the better process parameter settings in the injection molding process.
Plastic Instability Criterion of Radial Ring Rolling
Authors: Xu Zeng Hai , Zhao Dong , Wang Qiang
Published: May 2013

The ring is subjected to the combined action of rolling deformation and guide rolls in radial ring rolling process. If the rolling process parameters are designed unreasonably, the ring may be deformed unexpectedly or squashed to waste product. In this article, equation of ring’s bending moment in rolling process is developed based on the mechanical model. Then the stress of ring at any point is analyzed and the maximum stress is found out. The plastic instability criterion of radial ring rolling is also proposed based on the analyses above.
Math Modules Establish for BUR Edge Chamfer and its Grinding Process
Authors: Wang Yun , Ning Xiao Xia , Jing Hong Peng
Published: May 2013

This paper analyzes the reasons that lead to edge failure on back-up roll and puts forward the countermeasures. The corresponding mathematical model of present grinding curve is designed, in order to adapt reconstructed roll.
Modeling of Force on Axial Power Ultrasonic Honing
Authors: Liu Zhen , Zhu Xi Jing , Wang Jin Qing , Shao Yun Peng
Published: May 2013

Ultrasonic vibration machining is a kind of effective method for precision processing of brittle-hard materials, especially it can obtain good surface quality in engine cylinder liner precision processing with the power ultrasonic honing. Based on the material removal mechanism of ultrasonic honing, a new ultrasonic honing force model was established, which included material chip deformation and friction situation between grains and workpiece. Therefore the effect to honing force can be known clearly with processing parameters and material physical change, which provided theory foundation to further study in ultrasonic mechanism and real time surface quality protection in honing process.
Research of Bearing Crown Roller-Raceway by Non-Uniform Interelectrode Gap Electrochemical Mechanical Machining
Authors: Wei Ze Fei , Zheng Xing Hua , Tao Bin
Published: May 2013

Electrochemical mechanical machining (ECMM) is introduced to the manufacture of bearing crown roller-raceway in consideration of the very problems appearing in traditional machining methods. Firstly, numerical model on the non-uniform interelectrode gap ECMM is established and anode crown shapes under different cathode shapes are analyzed. Afterwards, according to the requirement of anode crown related cathode shape is formed through numerical simulation. In the end, the crown of bearing roller-raceway is machined by practical concave cathode with improved surface quality and certain crown face.
Research on the Relation between Cutting Parameters and Axial Cutting Force in Helical Milling Process
Authors: Wang Hai Yan , Qin Xu Da
Published: May 2013

The select of cutting parameters is not only directly related to the productivity, but also related to the change of cutting forces. Axial cutting force is too large to be ignored in the helical milling process. In this paper, the axial forces in helical milling of Cold die steel under different cutting parameters are measured, and the regression model of the axial force about the change of the cutting parameters is established, the influence of the cutting parameters on the axial cutting force is analyzed through the experimental results and the regression models respectively. The main purpose is to control axial cutting force and improve tool life in the cutting process.
Simulation on Material Removal during Reciprocating Traveling WEDM of Insulating Ceramics
Authors: Guo Yong Feng , Hou Peng Ju , Sun Liu Xian , Wang Li , Li Zong Feng
Published: May 2013

With the double layer structure model, the material removal of insulating ceramics ZrO2 during the machining process by reciprocating traveling wire electrical discharge machining (WEDM) was simulated and analyzed. The influence of conductive layer (C and ZrC) to material removal volume and crater dimension was compared. And the effect of peak current, pulse duration and the movement speed of wire electrode on discharge craters were researched. The simulation shows that the conductive layer exist has much influence to the material removal volume and crater length and width, but has less influence to crater depth during electrical discharge. The simulation for the effect of discharge parameter tells that, with the boiling removal form hypothesis, the material removal volume during single discharge is increasing with the increment of peak current and pulse duration but decreasing with the raising of wire electrode movement speed. For the variation of peak current, the removal volume of ZrO2 is exceeding the removal volume of conductive layer when Ip is bigger than 24A. Meanwhile, for the variation of movement speed of wire electrode, the removal volume of conductive layer is more than that of ZrO2 when v is over 5m/s.
Extraction of Tantalum from Ta2O5 Using SOM Process
Authors: Chen Chao Yi , Lv Ying Lu , Li Jun Qi
Published: May 2013

A novel process of solid-oxide-oxygen-ion conducting membrane (SOM) technique has been investigated to produce Ta metal directly from Ta2O5 in molten CaCl2. The sintered porous Ta2O5 pellet was employed as the cathode while liquid copper, saturated with graphite powder and encased in a one-end-closed yttria-stabilized-zirconia (YSZ) tube, acted as the anode. The particle sizes and porosity of the cathode pellets are important factors that have significant impact on the electrolysis process. The optimal experimental conditions is pellet sintering and electrolytic temperature 1100°C, cell voltage 3.5V, electrolysis time 2h.
Study on Initial Oxidation Film Formation Mechanism of T23 Steel at 600°C
Authors: Wang Wei , Wang Zhi Wu , Zhong Wan Li , Song Tao , Wei Wei
Published: May 2013

Using scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS), the morphology observations and composition analtyses of a T23 steel oxidized in water vapor for 10~150min at 600°C were investigated, to study the initial formation mechanism. The result showed that the initial oxidation film was changed from acicular to flake shape. The second oxidation film layer appeared after oxidation for 40 min, and obvious double oxidation film structure was formed after 150 min with inner Cr-rich protective isometric crystal and outer Fe primarily columnar crystal.The oxide was Fe-rich phase in the whole oxidation process.
An Investigation on Vacuum Brazing of Dissimilar Nonferrous Metals of Cu and Al
Authors: Yu Wei Yuan , Xia Tian Dong , Ding Wan Wu , Wang Xiao Jun , Zhao Wen Jun
Published: May 2013

The writer successfully obtained brazed Cu-Al joint by using vacuum brazing method, and also conducted an analysis for the microstructure morphology of the joint. The result shows that: The interface of the brazed Cu-Al joint includes three parts---the transition area on the Cu side, the central brazing seam area and the transition area on the Al side. Formed between the brazing seam area and the Cu substrate are the Cu3Al2 and CuAl2 layers, and the average width of the transition area of Cu3Al2 is 12 μm while that of CuAl2 8 μm. The brazing seam area is mainly composed of α-Al solid solution, Cu3Al2 and CuAl2 metal compounds, in addition, the ε-Cu15Si4 phase, the Al-Si phase and CuZn2 phase are also formed. These phases present themselves in the state of acicular compounds, which are dispersed in the brazing seam area.
Weld Seam Deviation Detection Base on Laser Welding Pool’s Centroid
Authors: Zhen Ren He
Published: May 2013

For detecting weld seams deviation during the industrial actual welding process, IPG YLR-10000 high power fiber laser welding equipment was used during laser welding experiments. A high-speed near-infrared camera was used to capture the dynamic welding pool image sequences. Through studying the change of the features of near-infrared images of the weld pool when the laser beam deviated the weld seam, the centroid of the welding pool could be used as the deviated parameter of the weld seam. The welding pool images coordinates were established, and the ways of rotating and shifting the coordinates were used to build a model to test the welding spots deviation. Finally, the model of the relationship of the actual weld seam deviation and the tested weld seam deviation had been set up by using the regression analysis method. Its validity and feasibility had been tested by analyzing the models correlation R parameters.
Analysis of Organizations of Brazed Seam 5052 Al Alloy Contact Reactive Brazing
Authors: Tan Fen Fang , Du Kang
Published: May 2013

Test of 5052 Al alloy contact reactive brazing has been conducted in the case of special brazing parameters, using Cu foil-Mg power-Cu foil as reaction layer material, the microstructure were analyzed and discussed primarily. The results show that the brazing seam structure consisted of α-Al solid solution and CuAl2 intermetallic compound; the organizations of brazed seam include Al (Mg, Cu) solid solution CuAl2 binary intermetallic compound, complicated ternary intermetallic compound and Al2MgO4.
Numerical Simulation Research of Tailor-Welded Blanks
Authors: Guo Wei Gang , Jin Qi Lin
Published: May 2013

Different numerical simulation methods on forming of tailor-welded blanks has been introduced with details, and the influence of various numerical models on the results of simulation was compared. Forming process of Square box was studied, and the difference between simulation results of two kinds of numerical modeling was discussed. The development direction of tailor-welded blanks CAE has been put forward.
A Method Based on the Morphology of Lead-Free Solder Powder Adhesive Particle Segmentation
Authors: Wang Hong Mei , Lu Lin , Liu Xiao Long , Gao Feng
Published: May 2013

Three kinds of lead-free soldering tin powder particles produced by means of ultrasonic vibration atomization were studied in this paper. For tin powder particles had higher edge angle and more irregular shape which were the two most key elements that may influence the quality of soldering paste, aspect ratio and fractal dimension of those particles were treated as the facts that could reflect the morphology of soldering tin powder particles. Geometrical projected images of those particles were acquired by optical microscope and image computing were processed by morphologic method. Since particles adhesion phenomenon often occurred in actual image processing of soldering tin powder particles, Roberts operator was used for edge detection and in the meantime, Erosion method and Dilation method in morphological operation were applied to segment those adhesive particles. It was shown that the morphologic method proposed in this paper could be applied to segment those images of adhesive particles.
Influence of Heat Treatment on Microstructure and Properties of Ultrahigh Strength Fe-Ni-Co Alloy
Authors: Zhong J.Y. , Zhong P.
Published: May 2013

The effect of temper temperature and duration on the microstructure and mechanical properties of new-type ultrahigh strength Fe-Ni-Co alloy was investigated with by mechanics performance testing and TEM. The results showed that the maximum ultimate tensile strength could reach 2230MPa after temper near 470°C due to the precipitation of coherent zones of fine carbides. With tempering time extended, the strength was cut down by the M2C carbides coarsening and the decreased coherency with matrix.
Design and Analysis of the Spiral Staircase in Large Steel Structure
Authors: Ding Xiao Fei , Qu Ben Ning , Zhao Xin
Published: May 2013

A pillar spiral three floors staircase with no need additional be needed for construction in engineering. Based on this project profiles and steel stairs design standards, the appearance and the form of structure of the stairs be designed. And the spiral staircase’s overall modeling set. Calculated on the strength and deformation be analyzed by finite element analysis software. Provide a reference for other similar projects.
Simulation Calculation of the Braking Performance of Portal Cranes Based on ADAMS
Authors: Hu Jing Bo , Zou Hui , Feng Yue Gui , Jin Hui , Wu Xiao Ling
Published: May 2013

The braking performance of open-air crane is essential to safety. Taking 40t Portal crane as the study object, this paper first analyzed and calculated the braking torque of traveling mechanism according to the design rules for cranes. Then the portal crane traveling mechanism model was established by the use of simulation software ADAMS, the braking process of crane of constant wind load was studied on typical operation conditions, and its braking performances were comparative analyzed. Finally, it can be concluded that it will substantially increase the crane braking time and braking distance after braking torque is adjusted small and cause hidden troubles of accident. The analytical method and conclusions of this paper can provide a theoretical basis to crane safety management.
A New Method to Handle Temporal Planning in Flexible Graphplan Framework
Authors: Ren Jia Yue , Zhang Lei , Xiong Zhuang , Qi Li Jun
Published: May 2013

This paper presents a new algorithm FTGP which could deal with temporal information in Flexible planning framework. The new algorithm could solve the action whose duration is no longer an abstract time unit, but a positive real number. We defined new mutex relationships according to the characters of temporal planning and Flexible planning. FTGP adopted a compact graph expansion, which could save time and space of expansion.
Numerical Analysis of Flat Circular Parachutes Inflation Process
Authors: Yu Ying Xiao , Tian Jia Lin , Chen Ying
Published: May 2013

Numerical modeling and analyzing of parachute inflation process is of prime interest for the mission analysis and design of parachute system. The inflation process and inflation law of a typical flat circular personnel parachute are presented. Then the fundamental equation of the mathematical model of parachute inflation process was formulated. Finally, the present model is used to calculate opening force, and the factors that influence parachute opening shock are analyzed.
The Development and Simulation of the 3D FEM Software ---- Alpha System
Authors: Xu Mei Rong , Wang Bo Wen , Li Meng , Wang Jian Xi
Published: May 2013

Aimed at the Chinese FEM (Finite Element Method) software market was occupied by foreign company, the article introduced the FEM software----Alpha System, which was developed by us. Alpha System could deal with heat transfer and structure static problems. It had 6 modules such as project management, geometric modeling, meshing, loading, solving, and visualization. Some of the key technologies were afforded to solve the difficulties on achieving the software. At last, a part of car rear axle was simulated by Alpha and Ansys. The contrast analysis of the result proved the accuracy of Alpha System. The article gives the reference on how to design the FEM System.
Development of CAD Module for Gating System of Iron Castings Based on Sinovation
Authors: Zheng Hong Liang , Yuan Xin Xin , Li Lin , Tian Xue Lei
Published: May 2013

Based on the source code of 3D modeling software called Sinovation, the user interface is developed by Visual Studio 2005, then 3-demensional computer aided design (CAD) module of gating system for iron castings is built by the Script language of SINOVATION. The CAD module has a friendly interface, quick and accurate calculation, and is able to design complicated gating system. As the efficiency and accuracy for gating system designing are improved,
An Identification Method for Joint Parameters Based on Finite Element
Authors: Chen Zhong Qing , Wang Yi Fei , Zhu Yi Sheng , Xu Zong Hang , Song Kai Ping
Published: May 2013

Aiming to solve the problem of joint surface stiffiness identification,this paper presents a finite element identification method. The method based on finite element simulation and the curve fitting principles, fitting out a curve that closed to simulation results. It can identify the joint surface stifiness effectively and rapidly based on curve fitting of simulation data in sensitivity area. This method avoid the transfer function matrix difficult to test and reverse solve problem. Comparing the results of the proposed method with the substructure synthesis method, it is shown that finite element identification method is effective.
Dynamics Influences Discussion of Robot MiniQuad-II for Construction Member Structure Change Based on ADAMS
Authors: Wang Liang Wen , Wang Chuan Peng , Wang Xin Jie , Mu Xiao Qi
Published: May 2013

MiniQuad- II is a modular four-legged walking robot. In order to research dynamics and kinematics of the robot, based on inner relation of different simulation software, three-dimensional entity model of four-legged walking robot MiniQuad-II is built up with SOLIDWORKS software firstly. Then, the model is leaded in ADAMS software, dynamics and kinematics of the robot are simulated, the relevant process is described in this paper. As an example, the robot MiniQuad-II walking along straight line is investigated, the dynamics of the robot are analysed with ADAMS. Further, the influences on dynamics properties for the robot are discussed when structural parameters of the robot are changed. Results can be used to optimaze robot structure and determine its final characteristic parameter.
Numerical Simulation Analysis on Repairing Hole of UAV Wing
Authors: Jin Guo Dong , Lu Li Bin , Gu Liang Xian , Liang Juan
Published: May 2013

Parachute recovery of UAV is often caused of holes and other injuries on wings, that are required repair and maintenance. The surface of the patch will form the high stress area, that affects UAV using life and safety .But repair method is good or bad directly affects size of the high stress area. Based on finite element method, the broken hole repairing method was formulated and validated by ANSYS. The method could minimize the high stress area as far as possible, and economically repair broken hole of wing in certain precision and safety standards condition. It has a certain reference value for UAV repair and management, and has reference significance for extending the service life of the UAV. Key words: Finite element method; Unmanned Aerial Vehicle (UAV); Simulation; Hole of wings
Study of the Effect of W and Mo Binary Alloying on Fe-Ni36 Invar Alloy Properties
Authors: Wang Chao , Yuan Shou Qian , Yao Cheng Gong , Feng Zhen Ping
Published: May 2013

The element W, Mo with paremagnetism and grain refinement is selected according to the theory of magnetostrictive and fine grain strengthening method. The sample with low coefficient of thermal expansion (CTE) and high strength are made by W and Mo alloying of Fe-Ni36, forging and heat treatment. The mechanism of low coefficient of thermal expansion and high strength is analyzed by means of the results of Chemical analysis, metallographic and scanning electron microscopy, grain size, micro-hardness and CTE testing. The result shows: the strength of matrix is improved by W and Mo alloying, the CTE is lower at the same time.
Research of Modeling and Simulation of Aviation Ignition Equipment
Authors: Song Kang , Liao Jun Bi , Yang Qian
Published: May 2013

Ignition energy of aviation ignition equipment is an important parameter for reliable launch of air jet. The factors are quite more that influence ignition energy and increasing the charge voltage of capacitance with high efficiency is an approach which increasing ignition energy efficiently. The charge voltage is the output voltage of switching power of ignition device. A mathematic model was constructed for switching power, and a mathematic expression were deduced about output voltage uo with input voltage ui and other elements parameters of switching power supply. An important conclusion were obtained which uo mainly depended on input voltage ui, load RL, dynatron collector peak current ICM on certain condition through a smart transform. When increasing ui, RL, ICM , uo increasing observably. The PSpice circuit simulation software is used for simulation, and the results show that the above conclusion is valid and feasible.
Study on the Pressure Distribution on Solid-Plug Conveying of Centrifugal Extruder
Authors: Zhao Jing , Wang Shi Jie , Lv Xiao Ren
Published: May 2013

In this paper, a new polymer process machine--- centrifugal extruder is introduced. The performance of centrifugal extruder had been studied by theoretical analysis. The analysis shows that the centrifugal force field can provide the solid-plug conveying pressure sufficiently and stably, which can prove the industry practicability of centrifugal extrude. By further discussion, it shows that the important influencing factors on the pressure comprise the structural parameters of the rotors and the rotation velocity.
Effect of Pre-Oxidation on the High Temperature Oxidation Behavior of Fe-Cr-Al Powder Porous Metal
Authors: Oh Jae Sung , Lim Seon Hui , Choi Sung Hwan , Park Man Ho , Lee Kee Ahn
Published: May 2013

This study investigated the effect of pre-oxidation on the high-temperature oxidation behavior of Fe-Cr-Al powder porous metal. Using the powder metallurgy process, Fe-Cr-Al powder porous metals with and without pre-oxidation were manufactured. 24-hour TGA tests were conducted at three different temperatures: 900°C, 1000°C, and 1100°C. The high temperature oxidation results showed that pre-oxidized powder porous metal had even higher levels of oxidation resistance compared to that of porous metal without pre-oxidation regardless of the oxidation temperature. The weight gain of pre-oxidized porous metal (0.123%) was lowest at oxidation temperature of 900°C. In contrast, the weight gain of porous metals significantly increased at 1100°C. In the porous metals 900°C and 1000°C oxidized specimen, oxides such as Al2O3and Cr2O3were mainly observed. Porous metals oxidation specimen at 1100°C also revealed the presence of Fe-based oxides in large quantities in addition to the oxides formed at lower temperature.
The Spent Fuel Pool Analysis of Chinshan Nuclear Power Plant by Using TRACE/FRAPCON-3.4
Authors: Wang Jong Rong , Lin Hao Tzu , Li Won Win , Chen Hsiung Chih , Shih Chun Kuan
Published: May 2013

After Fukushima nuclear power plant (NPP) event, INER (Institute of Nuclear Energy Research, Atomic Energy Council, R.O.C.) performed the safety analysis of the failure of spent fuel pool cooling for Chinshan NPP by TRACE. In this study, by using the above TRACE results, we focused on the application of FRAPCON-3.4 in the spent fuel pool safety analysis of Chinshan NPP. FRAPCON-3.4 can calculate the temperature, pressure, and deformation of a fuel rod as functions of time-dependent fuel rod power and coolant boundary conditions. There are two steps considered in this study. The first step is the verification of the FRAPCON-3.4 by using IFA-431 experimental data. The next step is the fuel analysis of Chinshan NPP spent fuel pool by using FRAPCON-3.4 and the TRACE results.
Feasibility Analysis and Simulation of Minitype Combination Balance
Authors: Fan Yong , Wang Yang Xin , Wang Zheng Can
Published: May 2013

the emergence of combined balance technology has solved many traditional single balance problems, such as less precision, low measurement speed. But for small users who require constant transformation need high precision measurement, small volume and convenient minitype combined balance. based on combined scale analysis and simulation software, it is concluded that the minitype combined balance meets the requirement and provides groundwork for the physical balance body.
Finite Element Analysis and Experimental Study of an Electromagnetic Shell Part with Flow Control Forming
Authors: Huang Zhi Wei , Wan Yuan Yuan , Wang Yan Bin , Che Lu Chang , Liu Chuan Lin , Chen Gang
Published: May 2013

In this paper, an electromagnetic shell part was studied with the design of die, simulation and the flow control forming (FCF) method. The important technology of FCF was the design of cavity die to control metal flow. The simulation results indicate that pyramidal faces of cavity die exerted a significant influence on qualities of parts. The simulation results also revealed that the effective stresses of the sheet were inhomogeneous and the distributions of the equivalent stress were lamellar with obvious gradients. Experimental results show that steel sheet (08Al) could be formed in one step into intricate shapes at room temperature. This confirmed that FCF is a safe, clean and practical method for the near net forming of parts.
Finite Element Analysis of Frame on ZXZ90 Towing Machine for Cable
Authors: Wang Hui , Nie Jin Ning , Wang Peng , Guo Peng Hui
Published: May 2013

In this paper, structure characteristics of frame on towing machine were analyzed. Based on shell element as the meshing type, finite element surface geometry model was established. The forms of loading on towing condition were studied, it is confirmed that drum was simplified as the key point on towing condition, and then the load was transmitted by rigid connection which got key point and frame connected together; and the load was applied at centre of gravity of parts; based on the safety performance on different conditions verified by finite element analysis, the structure improvement advice was proposed for frame.
Effects of Annealing on Microstructure and Phase Transformation Temperature of NiTiNb Shape Memory Alloy after Equal Channel Angular Pressing
Authors: Huang Yuan Zhi , Lu Shi Qiang , Liu Jun Wei , Wang Ke Lu , Li Gui Fa , Shu Xiao Yong
Published: May 2013

The effect of annealing temperature（300-600°C）on the microstructure and transformation temperature of NiTiNb shape memory alloy rods deformed with equal channel angular pressing（ECAP） method was analyzed. The results show that the hard brittle phase （Ti,Nb）2Ni was decreased after ECAP. With the rising of annealing temperature, the number of β-Nb phase increase while eutectic declines. The DSC analysis shows that the martensite and reverse transformation temperature increase with annealing temperature. After annealing with 500°C, the martensite/austenite transformation starting temperatures rise to -64.6°C and -30.1°C, respectively.
Research and Prediction of Yellow Soil Moisture Content in Guizhou Province Based on ARIMA Model
Authors: Liu Min , He Zhi-Min
Published: May 2013

To predict the change trend of guizhou yellow soil moisture content, we employed the ARIMA model of time series, compared the measured data with the prediction data, and the results show that ARIMA time series model fitting soil moisture content change trend is good, predicted value is very close to the observed value. The maximal absolute error, 0.6% and the maximal relative error, 4.2%).The results have practical application value for drought research and management to provide reference[1].
Prediction of the Flow, Reaction and Heat Transfer for Glass Furnace Firing Petroleum Coke
Authors: Hu Chang Sheng , Wang Yun Bo , Wang Ping , Bi Jian Quan
Published: May 2013

In this paper, the mathematical models of gas dynamics, combustion and heat transfer and dispersed phase were established for the glass furnace combustion space, according to the practical glass furnace and operation condition, the computer simulation of the glass furnace was made; the simulation results coincided with the facts. On the base the influence of particle size of petroleum coke and oxygen-enriched combustion on the furnace combustion has been simulated.
Research on Materials Corrosion Failure Model of Liquefied Natural Gas (LNG) Cylinder for Vehicle
Authors: Zhong Yue , Fei Yu
Published: May 2013

Liquefied natural gas (LNG) cylinders application for vehicle is a new type of product in China, but the reaserch of its safety performance is less. The paper analyzed the mechanism and origination of corrosion failure of LNG cylinder materials, simulated the corrosion failure model quantitatively based on ansys software and obtained the maximum corrosion of LNG cylinders under the nominal working pressure of 1.6MPa and 3.2Mpa. The effective measure to prevent the corrosion failure of LNG cylinder is also proposed in this article.
Integrated Kinematics Optimization and Strength Analysis for a Wheel Loader Boom Mechanism
Authors: Chen Nan , Yang Jia Ning , Liu Yun Hua
Published: May 2013

Based on the kinematics optimization method integrated in ADAMS, the mechanism parameters of the loader boom for a wheel loader are designed to keep the variety of the pylon rotation angle as smaller as possible during the loader boom lifting or falling process. A rigid-flexible coupled model is developed to analyze the dynamic stress of the lift arm and the contact element methodology is adopted to model the coaxial rotary joints connections. The results simulated by ADAMS indicate that the optimization is well fulfilled. Integrated kinematics optimization and strength analysis provide the well basis for further optimization of whole structure.
Numerical Simulation on Thermal Field in the Fluidized Bed with Internal Heating Plates
Authors: Duan Ji Hai , Wang Qi
Published: May 2013

Fluidized beds are widely used in the factories. However, the traditional heating methods can not meet the actual needs. Then we propose a new type fluidized-bed, which can effectively resolve the problem occurred in conventional fluidized-bed. The temperature of the reaction gas can be distributed uniformly in the new type fluidized-bed, the bed pressure drop is relatively stable over time. The above situations are conducive to the reactions stability, and reduce the occurrence of side reactions as well.
A Template-Matching-Based Fast Algorithm for PCB Components Detection
Authors: Yin Hai Ming
Published: May 2013

In this paper, a novel multi-level image matching-based method is proposed for the PCB components detection. After the registration of PCB image, a quick coarse matching is carried out to find the similar region with the standard component image in the certain region; and then a precise matching is conducted to judge whether it is the specific component. Our experimental results indicate this method can detect common PCB components with high speed and high precision.
Deep-Hole Precision Honing of Difficult-to-Cut Materials
Authors: Xu Xu Song , Sun Zhi Ying , Liu Zhan Feng , Peng Hai
Published: May 2013

For the deep-hole drilling is in closed or half-closed condition and the cutting situation can’t be controlled directly, it brings a big challenge to attain the machining precision. Deep-hole honing is an effective process method that can ensure the precision of size, geometry shape and surface quality. A new machining technologies of finishing honing on precision deep-hole are discussed. Two typical machining examples were illustrated, and the machining effection were also discussed. The key technology and chief feature of strong honing were analyzed through honing experiment of titanium alloy and PH stainless steel. The experiments indicate that strong honing is one effective method to solve the problem of precision deep-hole machining of difficult-to-cut materials and the honing tools which was used in the experiments have the feature of good rigidity, high cutting efficiency.
Effect of K2S2O8 on Material Removal Rate in Abrasive-Free Polishing of Hard Disk Substrate
Authors: Zhao Rong , Lei Hong
Published: May 2013

The role of K2S2O8 (KPS) initiator on the material removal rate (MRR) of hard disk substrate in the H2O2-based slurry was investigated. Experiment results indicate that the MRR of slurry containing KPS and H2O2 is higher than that of slurry containing only H2O2 under the same testing conditions. The electrochemical test shows that KPS can increase the corrosion rate of hard disk substrate in the H2O2-based slurry. The electron spin-resonance spectroscopy (EPR) analysis shows that KPS, as an initiator, can increase the number of OH• free radical. Further, the reaction mechanism of KPS in abrasive-free polishing of hard disk substrate is discussed.
Simulation Analysis of Thermodynamics on the Belt Spindle of the Machining Center
Authors: He Qiang , Li An Ling , Zhang Yong , Jun Ye , Li Xin Sheng
Published: May 2013

By taking the belt spindle of the machining center high speed and high precision as the research object, using the finite element method, the Solidworks software is used to make the thermal analysis. In this paper, we define the boundary conditions and thermal load of the spindle thermal analysis, and establish the finite element model. The steady-state thermal analysis and temperature rise is simulated, and the temperature distribution is predicted by using Solidworks software. The results show that the structural design of the belt spindle is reasonable, and the temperature rise is in the control range.
Comprehensive Test of Electric Spindle Based on Thermal Stress
Authors: Sun Zhen Hong , Gao Wei Guo , Xiao Hui
Published: May 2013

This document explains the details of electric spindle thermal characteristics experiments. The temperature distribution, shaft deformation and the stress of temperature sensitive points are tested. Thermal characteristics are gathered about the different cooling strategies and different spindle speeds in the experiments results analysis. Choosing reasonable cooling strategy can use to design spindle cooling system. Thermal stress test can obtain accurate data at temperature sensitive points. The stress analysis can be used to reflect spindle deformation.
Study on Ultrasonic Cavitaion Field of Power Ultrasonic Honing
Authors: Guo Ce , Zhu Xi Jing , Liu Guo Dong
Published: May 2013

Power ultrasonic honing is an advanced precision grinding technology, with ultrasonic vibration applied on the oilstone surface. The high frequency vibration of oilstone make cutting fluid appear cavitation effect, which make acoustic field of power ultrasonic honing present instability and complex, and even appear chatter and noise. In this paper, the cavitation mechanism of power ultrasonic honing is explained, and the oilstone radiated pressure are obtained. Furthermore, the dynamics and radiated pressure model of cavitation bubble in the grinding area is established and analysed. Finally, the pressure of oilstone surface is measured by ultrasonic sound intensity measuring instrument. It shows that the acoustic pressure radiated from oilstone with theoretical calculations and simulations are one order higher than cavitational threshold value of cutting fluid, ultrasonic cavitation occurs. Cavitation bubbles have been nonlinear vibration with high frequency, great amplitude and up to 107 Pa orders pressure, which seriously affect the workpiece processing quality and oilstone life. Comparisons between theoretical analysis and experimental verification have shown a satisfactory agreement.