bluuebunny/crossref_metadata_2025 huggingface dataset:
Finite Element Analysis of Automobile Clutch Cover Assembly Test Bench Pusher
Authors: Li Jing , Wang Zhan Li , Jiao Yang , Zheng Ze Bin , Shao Chun Ping
Published: June 2012

3D Model of the Automobile clutch cover assembly test bench pusher is built by SolidWorks and then the whole system is transferred to the software of ANSYS. Use of ANSYS software receives the figure that distribution of the displacements and stress, and investigates the usual dangerous section of the pusher in theory, then gets the first ten intrinsic frequencies and the vibration model, and analyzes the actual vibration of the pusher. The result of static analysis showed that the pushing board design is rational and its deformation is in reasonable range. The result of model analysis showed that the pusher has not emerges of the gantry on dynamic performance.
The Research on Simulation Model in EDM of Insulating Ceramic Si3N4
Authors: Xu Xiao Bing , Xiong Tian Kai , Tan Li Jun , Zeng Yi
Published: June 2012

Insulating ceramic materials has been regarded as one of leading materials that promotes the industrial progress of the 21st century due to its unique electric and magnetic functions, and its special qualities such as high hardness, wear resistance, high temperature resistance and high pressure resistance also help a lot. Yet its modeling process is quite difficult. The traditional method is to grind it with a diamond after sintering into a certain shape. However, the low efficiency and the high cost certainly affect its widely application. Over the past 20 years, EDM has developed rapidly in ceramic material processing application, and EDM of conductive ceramic materials has become more and more practical. EDM is of the highly nonlinear characteristic, and it is quite difficult to use any specific mathematical expressions to describe its technological system, therefore, the developing trend of the researches in this field lies in the studies of its processing characters and its simulation techniques, of which, the artificial neural network, as a new technology, has provided an effective way for the further researches of EDM. It uses the computer to do a certain abstract, simplification and simulation of the functions of human brain, which can constitute a highly nonlinear large-scale continuous dynamic system. This paper employs the BP (Back Propagation) algorithm of the artificial neural network and makes the result of the orthogonal experiments on the processing technology effect as the learning samples of neural networks, thus establishes the simulation model of the multi-objective technology effect in EDM of insulating ceramic.
Design and Finite Element Analysis of a Hydraulic Excavator Boom
Authors: Habtay Gebremicheal Gedion , Chen Jin , Farooq Zaman Muhammed , Pang Xiao Ping
Published: June 2012

In today’s world of growing competition, all industries are trying their best to give the components of high quality with minimum expenditure. So in present work a new semi-elliptical boom has been selected to replace the conventional boom, which is usually made of rectangular. In particular, the study wants to substitute the rectangular section for Semi-elliptical section. This change lightens the weight of the boom. For this purpose, boom with semi-elliptical cross-section has been modeled using cad software pro/E wildfire 4.0. Using VB program automatic calculation module (UPAS), the static force at different working condition of the boom calculated. Then Finite element analysis has been done to determine the static stress at a given load condition using software ANSYS 12. The result shows that total weight is reduced by 5%. The value of maximum stress and displacement is 115.663MPa and 12.885 mm respectively. Thus the structure is capable of withstanding the maximum stress. The structure is failsafe. In this paper only static stress analysis is done.
The Research of Maintenance and Supportability Model on the Surface-to-Air Missile
Authors: Peng Li Ying , Liu Li Hua , Deng Ai Ming
Published: June 2012

In the text through analyzing the maintenance and support system of surface-to-air missile equipment is given a process model for the corrective maintenance, preventive maintenance. Spare parts supply and support equipment usage. The model can be used for the surface-to-air maintenance and support analysis and has reference to the maintenance and support simulation research for the other equipment with its good universality.
Theoretical Study of the Dynamic Effects Based on Work-Roll Model in Metal Sheet Rolling Process
Authors: Wang Qiao Yi , Zhu Yao , Gao Rui Jin , Zhao Yong
Published: June 2012

A new analytical model for the configuration of a four-high rolling mill stand is proposed in this article. Using the model, the dominant sources of stiffness in the fifth octave and the third octave models are identified. The assumptions made for the derivation of the model are that the work rolls are isotropic linear elastic, that there is no gap or separation between the work roll and the backup roll at all times. In addition, only the vertical interactions of the work roll and the roll-bite are considered. The nonlinear characteristics of this dynamic system are contributed from the contact area of the work roll and the backup roll. Analyses show that the natural frequency of the nonlinear analytical model matches the fifth octave rolling chatter, and the dominant parameters of the dynamic instability are characterized. The effects of inter-stand tensions, rolling speeds, friction between the work roll and the metal sheet roll-bite, and the thickness of the metal sheet on rolling chatter are discussed in the analysis of the dynamics of the rolling model.
Analysis on Influence of Effective Turbulence Intensity on Blade Root Fatigue Load of WTGS
Authors: Gai Feng , Cai An Min , Zhang Da Tong , Sun Li Xiang
Published: June 2012

Based on the Palmgren-Miner linear cumulative fatigue damage theory, the blade root fatigue loads in different effective turbulence intensities were calculated and analysed. The results show that when the air density and the wind speed are constant, the blade root fatigue loads increase linearly with the effective turbulence intensity increasing, and the slopes increase linearly with the wind speed increasing. According to these results, the main source of the blade root fatigue loads under different wind conditions can be estimated to provide a theoretical basis for WTGS type selection in the special sites.
Finite Element Analysis for Frame of Lift Transporter
Authors: Tian Jie , Xiao Guang Bing , Wang Wen Dong
Published: June 2012

The 3D-model of lift transporter frame was assembled by the parts, whose 3D-models were established under UG. And the finite element model was achieved in ANSYS/ Workbench. Four different analysis conditions were developed and the static properties of the frame in various conditions were analyzed by ANSYS/Workbench. The analysis results indicate that the design of the special frame is feasible.
Evolution Solutions for the Ostrovsky Equation: A Perspective from an Auxiliary Elliptic Equation
Authors: Xiang Chun Huan
Published: June 2012

The Ostrovsky equation is used to describe the oceanic waves affected by Earth rotation. The auxiliary elliptic equation was employed as a direct method to construct the evolution solutions for the Ostrovsky equation in this manuscript. Detailed analysis of evolution solutions of the Ostrovsky equation is presented. The periodic solutions, which read Jacobi elliptic function solutions, hyperbolic solutions and trigonal solutions, are obtained. More parameters are included in the evolution solutions, the parameter space is enlarged. This method adds a new route to explore evolution solutions of nonlinear differential equation in a perspective from auxiliary elliptic equation.
A GPU-Based Parallel Processing Method for Slope Analysis in Geographical Computation
Authors: Lv Min Hui , Wei Xiong , Lei Cai
Published: June 2012

Nowadays, geographical computation presents to be distributed, parallel, and diversification application trend. Influence of problem scale and response speed requirement received more attention. And high performance computational systems, such as “TianHe 1-A”, provides a new generation of hardware supports. In order to make full use of these high performance computational resources, appropriate and efficient parallel algorithms are needed. New parallel computing optimization technique of the geography is proposed in this paper by designing new parallel algorithms for slope analysis. We implement it based on CUDA. Experimental results with random DEM data in uniform distribution validate our methods.
Numerical Simulation the Temperature Field of the Multi-Coil Batch during Annealing Process in Bell-Type Furnace
Authors: Mo Chun Li , Li Qiang , Guo Xu Ming , Wang Hao
Published: June 2012

In this paper temperature field of multi-coil during batch annealing process in strong forced convective hydrogen atmosphere of Bell-type furnace was simulated, and the influences of heat transferring between steel coil and air flow under a given condition on the temperature field of the steel coil were studied. And then, the temperature field of a single and three coils steel plate were calculated during reheating, holding and cooling process according to the measured annealing curves. The simulated results show that the same trend of temperature in different steel coils. However, considering the heat radiation of steel coil, temperature variation in the topside of coil is higher than that in the bottom of coil.
Preparation of Epitaxial YBa2Cu3O7−y Films and CeO2 Buffer Layer on Ni-5at.%W Substrates by MOD Method
Authors: Huang Yan Qin
Published: June 2012

Biaxially textured CeO2 films were deposited on Ni–5at.%W (Ni–5W) tapes by a metal-organic deposition (MOD) method. Subsequent YBa2Cu3O7-y (YBCO) films were prepared using the (MOD) method leading to a simplified coated conductor architecture of YBCO/CeO2/Ni–5W. X-ray diffraction measurements revealed an epitaxial growth of the CeO2 buffer layer the 7.06°, 5.16°, for the out-of-plane and in-plane alignment, respectively. The superconducting coated film with a texture spread down to the out-of-plane texture is ω = 6.2° and the in-plane texture is φ = 7.6°. The results indicate that single CeO2-buffered Ni–5W tapes are suitable for the epitaxial growth of YBCO higher cube texture and the epitaxial YBCO film was obtained. To microstructural investigations, the film’s SEM results showed a dense, smooth and crack-free surface morphology. The superconducting properties were measured by four probe method. The superconducting transition temperature (Tc) was about 90 K with a narrow transition of 0.8 K and the critical current density (Jc) was about 1.5×104 A/cm2 at 77 K, 4T.
Contact Analysis of Truss Bridge Inspection Vehicle’s Oriented Rollers
Authors: Wu Xiao , Hu Xiao Le
Published: June 2012

Since that rollers of a certain type of bridge inspect vehicle were worn seriously in the process of using, a multi-contact dynamic model was set up utilizing ADAMS and SolidWorks. The Poison Model was used to describe the contact relationship between rollers and vertical truss. After dynamic analysis and calculation of contact forces by ADAMS, time-contact force curves were drawn. The curves proved that the results were consistent with the actual situation, so that the simulation process was verified.
Numerical Simulation of Thermal Shock Tests of Carbon-Containing Refractories
Authors: Liu Hui Min
Published: June 2012

To appraise the thermal shock resistance of carbon-containing refractories correctly, its thermal stress changes in thermal shock tests were analyzed by finite element method, and the mathematical model appraising its thermal shock fracture was built. The results show when the sample of carbon-containing refractory suffers thermal shock, the main damaged areas lie its centre during sharp heating process, but the sides during quenching process. The later is the main reason causing its damage. When appraising the thermal shock resistance of carbon-containing refractory by dip spalling method, the result matches fracture index.
QoS Control Strategy Simulation and Analysis Based on DiffServ
Authors: Shi Heng Hua , Xu Xin , Wang Yu Jie , Yang Yuan Yue
Published: June 2012

As the development and applying of real-time multimedia such as VoIP, video conferencing and so on, the Internet is required to provide a better QoS support. However, current IP network can only provide ‘Best Effort’ service and can not satisfy different network multimedia traffic quality requirements. Based on the analysis DiffServ architecture and studies its control mechanism, the OPNET simulation design different ToS value in IP header of VoIP traffic, and apply WFQ scheduling algorithm on the bottleneck link. The simulation results compare jitter, delay, delay variation of different ToS value of VoIP traffic, and analyze relationship of QoS and ToS value in the IP network.
Review on the Methods of Harmonic Elimination
Authors: Zhou Xue Song , Chen Guang Zhu , Ma You Jie
Published: June 2012

This paper describes the methods of Harmonic Elimination, with the development of power electronic equipment, harmonic pollution of power system is more and more serious traditional method for harmonic elimination and reactive power compensation is the LC power filter based on resonance principle, but this method can only eliminate the specified order harmonic, and probably cause parallel or series resonance with the power system. Due to the high controlling and quick response, active power filter has been paid more attention for eliminating harmonic with magnitude and phase varying. This paper discusses the main approaches for harmonic damping, proposes the study development of active power filter(APF), and gives some forecasting on the research of active power filter and hybrid active power filter.
Static Strength Analysis of Coupling Device of Converter in Different Positions
Authors: Ren Xue Ping , Lu Xiao Cong
Published: June 2012

Loading and solving the whole converter model in its three working positions based on ANSYS Workbench, getting the rods’ stress distribution, then finding out the value and position of the maximum stress, finally, checking the static strength. The results show that all rods can meet the strength requirements.
Numerical Simulation on Effect of Volute Width on Performance of a Centrifugal Fan
Authors: Lv Yu Kun , Song Bao Jun , Lu Tong Chang
Published: June 2012

Taking the G4-73№8D centrifugal fan as research object and utilizing the software of NUMECA to simulate flow fields of volute with different widths, the parameters of width are optimized through contrastive analysis of the effects on internal flow characteristics and performance. Results show that the optimized scheme can improve the uniformity of internal flow field, full pressure and efficiency seperatly increase by 0.52% and 0.48% under the design flow. For the needs of variable fan load operation, this paper puts forward the optimization principle of width parameter.
The Analysis of Twin-Screw Compressor New Liquid Film Seal Structure
Authors: Zhao Jiang Ping , Shi Fu Sheng
Published: June 2012

Shaft seal lubricating oil leakage of the J-201 Butadiene Gas Twin-screw Compressor occurs from time to time. According to the characteristics and related theories of process medium, the mechanical seal structure and pattern of Twin-screw Compressor had improved design . Using the existing auxiliary system and keeping the existing sealing structure, the non-contact mechanical sealing of process mediumprocess mediumdouble reverse crossing-groove oil film has ‘self-cleaning function’ which was applied to the screw compressor. To analysis its application technology and performance, the problem of Butadiene Gas Twin-screw Compressor shaft seal leakage had been solved.
Influence of Co Removal for Improving Diamond Films Adhesive on WC-Co Substrates by DC-PCVD
Authors: Liu Yan Feng , Yin Long Cheng , Zhao Li Xin , Zheng You Jin
Published: June 2012

The DC plasma chemical vapor deposition (DC-PCVD) method was a promising technique to fabricate CVD diamond coatings in industry, because it has many good properties, such as high grown rate of diamond films, big grown area, high qualities, and cost effective. In the present work, we synthesized diamond films on cemented carbide (YG6) substrates, and studied the different nitric acid aqueous solution treatment durations influence on diamond nucleation stage. The results indicated that well-chosen nitric acid aqueous solution treatment durations should be selected. For too short treatment times, the residual Co will promote the carbon transform from diamond metastable phase into graphite stable phase. On the other side, too long treatment times will consume too much Co, which will lead to the shortage of cohesive body, and finally the crackers in the bulk propagated and peeled off with the diamond films well grown on WC grains.
Balance Analysis of Reciprocating Inertia Force Based on Multi-Body System Simulation
Authors: Qin Li Li , Cao Xiao Hui
Published: June 2012

In signal cylinder diesel engine we often use dual shaft balance mechanism to balance reciprocating inertia force produced by the piston and moving parts, and reduce vibration of diesel engine. For this paper, the model crank -connecting rod and balance mechanism of a signal cylinder diesel engine were built in simulation software ADAMS. Piston’s movement law and its force curve have got through multi-body dynamics simulation to the model .By further processing to the simulation results, we got curves of piston’s reciprocating inertia force and balance shaft’s balance force. Comparing the two curves, we got the following conclusions: the difference between positive and negative peak for reciprocating inertia force that haven’t balanced was about 5500 Newton, which was equal to around 34% of the difference between the positive and negative peak for reciprocating inertia force, and the main reason for this is the dual shaft balance mechanism only balanced one step reciprocating inertia force; Though the balance effect was quite obvious, for ideal conditions there is a difference, and further improve can be done.
Kinematic Analysis of the Wheeled Terrain Adaptive Locomotion with Two-Degree-of-Freedom
Authors: Liu Ping Yi , Li Hai Tao , Zhang Shao Ying , Wei Wen Jun
Published: June 2012

According to the requirements for field work in precision agriculture, a new wheeled terrain adaptive locomotion theory with two-degree-of-freedom basing on the conventional wheeled locomotion mechanism is presented for the farmland environment in rough terrains of hill, mountain, and etc area. The mechanism’s two-degree-of-freedom of terrain adaptive locomotion is calculated when running on uneven terrain area. This research is valuable and helpful in theory for improving the agricultural machines’ terrain adaptive locomotion ability.
Study on the Kinematics of Planar Two-DOF Hybrid-Driven Robot
Authors: Song Sheng Tao , Li Rui Qin , Wang Ai Ling
Published: June 2012

The main research of planar two-DOF hybrid-driven robot is on the planar five-bar and the seven-bar mechanism, the planar two-DOF seven-bar mechanism is taken as the research object in this paper, the Assur Groups transformation method is used for the forward kinematics analysis of this seven-bar mechanism. The mathematical model of this mechanism is established for the forward kinematics analysis, and the COSMOSMotion is used for the kinematics and dynamics simulation of this hybrid-driven seven-bar mechanism.
The Testing and Finite Element Analysis of Temperature Distribution and Thermal Deformation in Vertical Machining Center
Authors: Fang Bing , Zhang Lei , Zhang Jian Fu , Li Ya Hong
Published: June 2012

This paper presented a real-time measuring method of temperature fields and thermal deformations in vertical machining center. And a FEA model including the thermal contact resistance at interface for evaluating the temperature distribution and tools deformation in vertical machining center (VMC) was established. Compared with the experiment results, it is shown that the new model is much more accurate than the traditional model without considering thermal contact resistance at interface.
Simulation and Research on Man-Machine Engineering of Trunk Lid
Authors: Li Li Jia , Zhao Li Li
Published: June 2012

Trunk assembly is an important opening and closing part of the car body，its design must be considered rationality of the trunk’s rationality, convenience, comfort and other factors, so there are certain difficulties in the design. This paper is based on the luggage’s design principle and basic performance requirements. And this paper also makes full use of ergonomics and makes a number of SAE dummy simulation to determine the best hinge type of the trunk lid.
Study on Shift Schedule of Automatic Transmission Based on Road Environment and Driving Intentions
Authors: Song Yong Dao , Cheng Xiu Sheng , Liu Xi , Han Peng
Published: June 2012

Traditional shift schedule of automatic transmission cannot meet driving requirements when vehicle is running under conditions of complex road and special driving intentions. On the basis of the analysis of vehicle dynamics, recognition methods of road environment and driving intentions were proposed according to the changes of vehicle dynamic parameters. Traditional shift schedule was rectified and simulation was carried out in vehicle equiped with dual clutch transmission. The results shown that the rectified shift schedule can meet driving requirements. This study can provide an effective shift schedule for automatic transmission.
Modeling and Simulation of Flexible Hydraulic Robotic Arm
Authors: Dai Li , Xu Da Lu , Liu Yu , Wang Jian
Published: June 2012

The flexible robotic arm drived by hydraulic are widely applied in most kinds of large engineering equipments, such as concrete pump truck, bridge monitor truck,etc. Nevertheless, the flexible distortion always break the precision of end-position and cause liberation of the whole arm system. In this paper, the movement of flexible hydraulic robotic arm and hydraulic cylinders are separately analyzed with flexible multi-body dynamics. And the dynamic differential equation is built with the driving force of the hydraulic cylinder as the main force. The equation is based on the theory of flexible multi-body dynamics, building the coupled model of robotic arm system and hydraulic-driving system to study the relation between the end-position, angle and the hydraulic system. What’s more, the simulation model of the mechanical arms is built by the dynamic simulation software. The project will theorectically support the intelligent control or auxiliary control of large engineering equipments.
An Improved Data Exchange Algorithm Based on the Relationships between Point and Triangle
Authors: Cheng Xing Hua , Yang Tao , Liu Xin
Published: June 2012

Data exchange (load transfer) between boundaries is a key technique in multi-physics coupling numerical simulation. Based on the relationships of point and triangle, an improved data exchange algorithm, namely Inside Projective Constant-Volume Tetrahedron (IPCVT), is proposed to improve the precision, in which the tetrahedron has higher quality to ensure that the subpoint of the target point locates inide the source triangle. Furthermore，the achieved data of the target point is calculated by tri-linear interpolation function in the projective palne, which greatly simplifies the computation and enhances the data-processing ability of the algorithm. The application of the algorithm to an example shows that IPCVT can well control the oscillation of Constant-Volume Tetrahedron (CVT) when there are large gaps or overlaps between the boundary meshes, and get a good precision in data exchange.
A 3D FE Model for Roll Forming of Ring with Complex Cross Section
Authors: Zhao Gang Yao , Zhang Ran Yang , Guo Zheng Hua , Feng Zhan Rong , Ying Shuai
Published: June 2012

The roll forming process is a technique for forming ring with complex cross section, which widely used in the fields of aviation, aerospace and other high technology industries. To predict and control the roll forming quality, a 3D elastic-plastic finite element (FE) model of ring with complex cross section for roll forming was developed using the explicit code ABAQUS/Explicit. During the modeling process, several key techniques are solved, such as materials modeling, geometry modeling and grid optimal design. Then the reliability of the model was verified. Furthermore, numerical simulation and analysis of the roll forming process of ring with complex cross section have been carried out by using the model. The distribution regularities of equivalent strain in the process have been analyzed. The results show that with the progressing of roll forming, the equivalent strain increase sharply in the initial stage, then slightly varies, and the W shape of ring cross section is produced gradually.
Investigation into the Characteristic of Air Pressure Field in the Melt Blowing with Dual Slots via Numerical Simulation
Authors: Xin San Fa , Wang Xin Hou
Published: June 2012

The characteristic of air pressure field in melt blowing with dual slots was studied. The main research method was the numerical simulation of three dimensional. The results show that the air pressure field is symmetric. There exist two sections: the pressure difference section and the zero-pressure difference section along the whole centerline. In the pressure difference section, there also exist three sub-sections.
Finite Element Analysis of Ultrasonic Vibration Assisted Milling of Ti-6Al-4V
Authors: Huang Hong Fu , Lu Dong , Wu Yong Bo , Yang Ming Ming
Published: June 2012

Finite element analysis models of both ultrasonic vibration assisted and conventional milling of Ti-6Al-4V were developed. In ultrasonic vibration assisted milling model, high frequency vibration (frequency, f=20kHz; amplitude, a=50 um) is superimposed on the movement of the cutting tool. Comparative analyses of temperature distribution, cutting forces, cutting stress were carried out for both ultrasonic vibration assisted and conventional milling processes. Overall reduction in milling forces and temperatures for ultrasonic vibration assisted milling in comparison to conventional milling is obtained.
Research on a New Scanning Process for the Flexible Forming Using Plasma Arc
Authors: Li Qing Tao , Yu De Ping , Yao Jin
Published: June 2012

Flexible forming using plasma arc (FFUPA) is a newly developed process of sheet metal forming, which can deform the sheet metal without mould and die, and thus is a promising method for rapid prototyping and short-run production. To achieve a large bending angle, it is unavoidable to scan the sheet metal for multiple times. However, the average bending angle reported in literature for each time is limited. To obtain a larger bending angle by each scan, this paper proposes a new scanning process, in which an assistant heat source is placed ahead of the plasma arc. The proposed scanning process has been studied by numerical simulation and optimized for the optimal processing parameters.
Reliability Optimization Design of Spacecraft Valve Spring
Authors: Lin Ye , Cui Wei Min , Song Bi Feng
Published: June 2012

Firstly, methodology of valve spring’s static strength and fatigue strength reliability analysis is built up, and detailed computational formulas to derive distributions of the stress and strength are described. Secondly, to make full use of the material characteristic and consider reliability of the mechanism part, taking the spring’s mass as the objective function and based on spring’s traditional and reliability constraints, mathematic model of reliability optimization design of valve spring is established using mechanical reliability design method and mechanical optimization design method. At last, the proposed method is applied to a practical spring design example by integrating optimization tools with the optimization model. The comparison of reliability optimization design results and traditional optimization design results shows that the reliability optimization method is practical and reliable; its design results can satisfy all design requirements with smaller mass.
Quantitative Analysis of Molten Metal Flow in Rotating Stirring Electromagnetic Field
Authors: Gao Li , Wang Rong Rong
Published: June 2012

Electromagnetic stirring is an effective technique of improving the solidification structure and mechanical properties during continuous casting，because there is a notably effect of the flow on the density,segregation and inclusion of molten metal. In order to better understand the molten metal flow, the analysis software-ANSYS is used to simulate the 3D couple field of electromagnetic field and flow field for the self-developed rotating electromagnetic stirring equipment. The pure aluminum,tin and lead are used for both of experiment and simulation. The following results are obtained: 1) The magnetic induction intensity of liquid metal surface (B0) is in inversely proportional to the current frequency and is proportional to the input volt/current. 2) The maximum electromagnetic force is directly proportional to the square of magnetic induction intensity (B0) and the nth-power of current frequency decreases with the increase of the electric resistance of molten metal and changes from 1/2 to 3/2. The n is 1/2 for aluminum metal and 1 for tin metal and lead metal. 3) The rotating velocity of molten metal is directly proportional to the magnetic induction intensity(B0) and is in inversely proportional to the square root of the density of molten metal. The viscosity of molten metal has little effect on the rotating velocity. The above results are consistent with experiment results, which prove the credibility of simulate results.
The Characterization of CdS Thin Film Prepared by CBD Method
Authors: Cao Peng Ju , Fan Ping , Liang Guang Xing , Zheng Zhuang Hao , Zhang Dong Ping , Cai Xing Min , Chi Jing Rong
Published: June 2012

CdS thin film was deposited onto glass substrates by the chemical bath deposition. The deposition temperature was maintained at 75 °C. The crystal structure, surface morphology, optical and electrical properties have investigated employing X-ray diffraction (XRD), scanning electron microscopy (SEM), spectrophotometer and seeback coefficient measurement, respectively. The XRD reveals CdS thin film grown at 75 °C has the mixed hexagonal and cubic structure. The optical band gap energy is 2.4 eV. The seeback coefficient is 197.3μV/k at room temperature. The electric resistivity of CdS thin film is in the order of 10000Ω•cm.
Structural Optimization and Simulation for Tractor Clutch Cover
Authors: Dong Fei , Hu Guo Liang , Guo Chen Hai
Published: June 2012

Based on the failure analysis of a certain tractor clutch, some local structures of the clutch cover has been modified and optimized. The various improvement schemes were analyzed by using the finite element method and an evaluation method of flatness of local regions was introduced in the paper. The results show that the maximum displacement and the flatness of local boss of the 2nd improvement scheme are separately reduced by 22.5% and 41.5% compared with the original. So the local stiffness of the clutch cover has been greatly strengthened. All these are important guidelines for the optimization and improvement of clutch covers.
Fatigue Simulation of High Pressure Water Jet Cylinder
Authors: Wang Kun , Ma Deyi , Song Yue Gan
Published: June 2012

The development of abrasive water jet cutting technology needs much higher reliability requirements of water cutting system. As one of the core parts in pressure generating system of water jet cutting, the High-pressure cylinder should have a stable fatigue life. The materials of the high-pressure cylinder are 34CrNi3MoA and AISl4340, and the stress of it under high pressure conditions was analyzed with the finite element analysis software ANSYS. For the existence of repeated plastic strain, the fatigue curves were gat by long-life theory. At last the fatigue of the high-pressure cylinder was simulated based on the stress. The results show that the stress is in distribution of 29MPa - 699MPa, and main of the body is under elastic strain. The whole fatigue condition can meet the requirements, but fatigue situation is worse in close to high pressure check export, the minimal life is 250000 cycle indexes.
Electrical Heating Properties of PEDOT Thin Film Prepared by In Situ Polymerization
Authors: Qi Jian , Huo Ning Bo , Cui Zheng Yi , Wu Jie
Published: June 2012

Poly (3, 4-ethylenedioxythiophene) (PEDT) has attracted a great deal of interest during the last decades. PEDOT was popular with many applications such as antistatic coating, the hole injection layer in OLED. The thermal stability of PEDOT is important in these applications. In this study, PEDOT films were prepared by oxidative polymerization on the substrate polyimide (PI) films. Matrix polymer poly (vinyl prrrolidone) (PVP), Monomer 3, 4-ethylenedioxythiophene), retardant were dissolved in solvent as monomer solution; The Iron (III) p-toluenesulfonate hexahydrate (FTS) was used as oxidant solution. To investigate the heating properties of PEDOT films, the content of PVP, oxidant FTS, retardant were varied. The influence of treatment current density was also studied. Thickness of the PEDOT film was measured by Alpha-step surface profiler and the surface resistivity was measured by multimeter.
Application of Fuzzy Comprehensive Evaluation Method in Long-Span Arch Bridge Damaged in Wartime
Authors: He Li , Qian Yong Jiu
Published: June 2012

In order to quickly assess the damaged long-span arch bridge in wartime, fuzzy comprehensive evaluation method (FCEM) is applied. Considering the main factors of strength, stiffness and stability, ignoring durability and applicability, the damage performance evaluation elements of long-span arch bridge subjected to blast loading are concluded. Combined with the specific long-span arch bridge subjected to blast loading, the damage condition is assessed with FCEM. For illustration, a highway arch bridge damaged in wartime is utilized to show the feasibility of FCEM. Because of the damaged features of uncertainty and fuzzy, FCEM can effectively assess the damaged conditions of a long-span arch bridge.
High Temperature Deformation Behavior of Ti-7333 Titanium Alloy and its Flow Stress Model
Authors: Fan Jiang Kun , Kou Hong Chao , Lai Min Jie , Tang Bin , Chang Hui , Li Jin Shan
Published: June 2012

The effects of processing parameters on deformation behavior of a new near β titanium alloy were investigated by using compression tests. The experiments were carried out in the Gleeble-3800 thermal and mechanical simulator in the temperature range of 770-970°C and strain rate range of 10-3-10s-1, and height direction reduction of 70%. The results show that the flow stress of Ti-7333 titanium alloy increases obviously with the strain and reaches a peak, then decreases to a steady value. The steady and peak stress significantly decreases with the increase of deformation temperature and decrease of strain rate. The flow stress model of Ti-7333 titanium alloy during high temperature deformation was established by using the regression method. The average relative difference between the calculated and experimental flow stress is 6.33%. The flow stress model can efficiently predict the deformation behavior of Ti-7333 titanium alloy during high temperature deformation.
Study on the Difference between Multipotiential Surface Model and Duncan-Chang Model Based on the Triaxial Test of Heda Highway Turfy Soil
Authors: Tang Shuai , Nie Lei , Qiao Dao Yong , Lv Yan , Yang Xu Ran
Published: June 2012

Firstly, this paper determined the experiment parameter of Duncan-Chang model, through Heda highway turfy soil ordinary triaxial test. Then get to the elastics strain relationship of the multipotiential surface model according to the data above. And finally get the applicable category of the two model through the contrast of the relationship of body strain and axial strain and the relationship of partial stress and axial strain.
Kinematic Simulation Analysis for the Precision Press Working Mechanism
Authors: Ke He Ji , Zheng Yu Qing , Chen Ming Ya
Published: June 2012

Based on the UG, the parametric model of the precision press working mechanism was built and its kinematic simulation analysis was implemented in this paper. The research results can be applied for the precision press working mechanism design [1], which can shorten the product development cycle and reduces the test cost.
Simulation Research of Three-Phase Magnetic Controllable Reactor
Authors: Zhao Guo Sheng , Cheng Zi Xia , Wang Xiu Pang , Li Dong Xue , Yao Ke , Sun Ke Qin
Published: June 2012

A kind of new type three-phase magnetism valve type controllable reactor is proposed in this article, its structure and the principle are introduced. The article carried the electromagnetism analysis on the new type magnetism valve type controllable reactor, and established the three-phase magnetism valve type controllable reactor two-dimensional simulation model with Ansoft electric-magnetic field analysis software. Simulation results verified the feasibility of adjusting the reactor reactance smoothly by adjusting the thyristor's triggering angle. Lastly, it made an analysis about three-phase magnetism valve type controllable reactor's electromagnetism field distribution.
Numerical Simulation of Temperature Profile in a Compartment Fire with a Roof Opening
Authors: Li Jin Mei , Li Qiang , Dong Yan Lei , Li Chang Hai
Published: June 2012

Fifteen numerical simulations are presented in this article to investigate the influence of roof opening size and fire source size on gas temperature profiles in a compartment. The fire source size has a significant impact on the temperature hot smoke layer. The temperature of hot smoke layer increases as the increase of fire source size. The roof opening has cooling function to gas temperature in the compartment especially for large roof opening. The temperatures of hot smoke layer decrease with the roof opening size increase in all cases.
The Study on Tail-Water Treatment Model in Shandong Province
Authors: Ren Jia Guo , Wu Qian Qian
Published: June 2012

In the basis of region hydrogeological investigations, we conduct a partition of geothermal resources in Shandong Province,geothermal tail water are divided three types in the basis of Categories and Hydrochemical Characteristics, we finish the experiment of high-salinity geothermal tail water in laboratory.We take the geothermal tail water treatment of Dongying as an example in Shandong Province, get various parameters through batch xperimentses, analysis of the treatment effect of treatment processes,then determine the optimum treatment and select Physico-chemical pretreatment - Ion exchange - Nanofiltration - Reverse Osmosis Mode,Which lets water treatment costs drop to 2.2 yuan/m3.Finally we put froword different types of geothermal tail water treatment and discharge mode of Shandong Province, and raise a comprehensive rationalization proposals about geothermal tail-water development and utilization, which provide scientific basis for the development of geothermal resources.
Control System Modeling for Automotive Brake Test-Bench Based on Improved PID Algorithm
Authors: Du Jia Xi , Shen Hong , Feng Yuexia
Published: June 2012

Based on PID controller, the closed-loop model of instantaneous torque for automotive brake test-bench was established, and then the instantaneous torque and the deviation function were calculated, furthermore, the genetic algorithm was adopted in order to get a global optimal solution and to optimize the parameters of the PID control system. So that the deviation function can be reduced or improved. By comparing the effect of control function, the causes for error volatility of the PID control system were derived, and the fitness function of genetic algorithm was determined reasonably. This algorithm can improve the reliability and accuracy of the control model effectively, and provide an effective method for testing the merits and integrated performance of automotive brake design.
Study on Guaranteed Measures of Construction Quality about Water-Proof and Screed-Coat of Roof
Authors: Wang Zi Jing
Published: June 2012

To prevent leakage of roof, in roof waterproof construction, it’s especially important to make sure the construction quality of the screed-coat. This paper introduces causes of quality problem and prevention measures in the construction of roof waterproof screed-coat.
Development and Design of LonWorks Intelligent Nodes
Authors: Zhi Shu Ya , Gao An Bang
Published: June 2012

This paper introduces how to develop and design multiple I/O nodes using the LonWorks field-bus technology, which is based on the mainframe (single chip microcomputer). It deals with the distribution of MIO nodes, the hardware design of TP/FT-10F master controlling module, the design of VCN-MIO platter and extending module(digital, analog), the trouble diagnose of nodes, and the anti-disturbance design. It has important utility value.
Generating the New Chaotic Attractors of the Lorenz System Family via Anti-Controlling Method
Authors: Deng Xin
Published: June 2012

In this paper, the first new chaotic system is gained by anti-controlling Chen system,which belongs to the general Lorenz system; also, the second new chaotic system is gained by anti-controlling the first new chaotic system, which belongs to the general Lü system. Moreover,some basic dynamical properties of two new chaotic systems are studied, either numerically or analytically. The obtained results show clearly that Chen chaotic system and two new chaotic systems also can form another Lorenz system family and deserve further detailed investigation.
Numerical Study on the Flow Structure of a Steam-Jet Vacuum Pump at Different Throat Length
Authors: Dai Xiao Chun
Published: June 2012

The aim of the study is to reveal the complication of the flow process of a steam-jet by using the simulation software package (FLUENT). The paper is able to analyze the flow phenomena inside the steam-jet when its throat length was varied. It is found that the entrainment ratio remains unchanged when the throat length is varied. It is also found that the shocking position moved closer to the exit of the vacuum pump and the critical back pressure of the steam-jet pump increased with the elongation of the throat.
Equivalent Analysis of Elastic Constants and Stability Calculation of Corrugated-Arch Metal Roof
Authors: Sun Li Tong , Lin Le Su
Published: June 2012

Corrugated-arch Metal Roof has anisotropic properties because of transverse small corrugations covering the surface of the structure. Thus the panels should be considered as orthotropic plates for more accurate analysis. Based on the principle of stressed skin diaphragm, elastic constants of Corrugated-arch Metal Roof with corrugations are analyzed using equivalent methods; the formulas for equivalent elastic constants are produced and the simplified calculation model is established. The stability of the structure is analyzed and evaluated by use of the finite element method. The results are compared with experimental results, and the method of equivalent analysis is validated. The results indicate that the theoretical bearing capacity is determined by overall stability under full-span and half-span loading without considering the initial defects. Through the equivalent analysis, the length and depth of corrugations are main factors affecting the equivalent elastic constants. Design recommendations are finally presented.
A Study on Three-Dimensional Seepage of Dam on the Deep Pervious Fracture Rock Foundation
Authors: Mao Hai Tao , Wang Xiao Ju
Published: June 2012

The theme of this paper concentrates on hydro- projects’ seepage field in rocks, including the properties of the seepage which flow through both hole qualitative like rocks and fractured rocks. Present the finite element analyzing program which can solve the problem of three dimensional seepage field in hole qualitative rock medium. Apply the program some hydro-project, computed the seepage field in the dam foundation and dam abutments. Besides, further research is done on the decision of the model range limit. And the influence of the pariah shape.
The Numerical Simulation of Flow Characteristics in T-Type Pipe
Authors: Zhu Yu Qin
Published: June 2012

The manifolds are flow distribution devices commonly used in the heating furnaces, heat exchangers, reactors, boilers, and so on. The flow distribution uniformity in the manifolds, to a large extent, decides the operation safety and economy of these devices. Manifolds are consisted of a number of T-type pipes, the flow characteristics in the T-type pipe takes an important role in the flow distribution non-uniformity of manifolds, so flow characteristics in T-type pipes were systematically researched and analyzed by the Fluent simulation software in this paper, exploring the influencing factors such as the inlet mass flow rate on flow distribution non-uniformity, and providing some measures to improve the flow distribution uniformity.
The Review of Chaos Research in Power System
Authors: Zhou Xue Song , Li Su Yang , Ma You Jie
Published: June 2012

Chaos has been studied in power system for the past two decades, chaotic phenomena have been observed in power system, such as chaotic oscillation, voltage collapse, etc. The basic concepts of chaos [1] and its characteristics [2] are introduced simply in this article. The recent chaotic studies and applications are introduced in this paper, including the routes to chaos, the ways applied to control chaos and short-term load forecasting methodology. This article also presents shortcomings and challenges of chaos studies in power system.
Fuzzy Fractal Interpolation Surface and its Applications
Authors: Xiao Xiao Ping , Li Zi Sheng , Gong Wei
Published: June 2012

Tackling of uncertain data is a major problem in analysis, modeling and simulation. Fractal interpolation surface and fuzzy set method are employed to solve the issue of uncertainty in modeling irregular surface. Initial interpolation data grid point is used as the kernel of Gaussian fuzzy membership function and its fuzzy numbers can be calculated by specifying λ of λ-cut set. These fuzzy numbers are used as uncertain data, which are the boundaries of the fluctuation of initial grid, and defined as a new kind of fuzzy interpolation grids. With these interpolation grids fractal interpolation surface algorithm is applied to act on. By these definitions, experimental data for modeling rock surface is illustrated to show that how the interpolation scheme proposed in this paper enhances the controllability for manipulating uncertain data.
CNC Machine Model of Epicycloid Bevel Gear and Cutting Experiment Based on Formate Method
Authors: Nie Shao Wu , Deng Xiao Zhong , Su Jian Xin
Published: June 2012

Based on formate cutting principle of epicycloid bevel gear, the cutter head is studied, and the formate cutting mathematical model with cradle structure is established, and the theoretical equation of tooth surface is derived, and the tooth flank deformation quantity caused by the changes of machine setting parameters is calculated. According to the relative motion and position relation between cutter and workpiece, the CNC formate machine for manufacturing epicycloid bevel gears is developed, and the machine model is established, and the machine setting parameters are solved according to models equivalence relation. Finally, a cutting experiment is conducted, and the influence of machine setting parameters variation on tooth flank deformation are analyzed, and it will provide theoretical direction for tooth flank correction.