bluuebunny/crossref_metadata_2025 huggingface dataset:
Population Migration Algorithm for Integer Programming and its Application in Cutting Stock Problem
Authors: He Deng Xu , Qu Liang Dong
Published: November 2010

For integer programming, there exist some difficulties and problems for the direct applications of population migration algorithm (PMA) due to the variables belonging to the set of integers. In this paper, a novel PMA is proposed for integer programming which evolves on the set of integer space. Several functions and cutting stock problem simulation results show that the proposed algorithm is significantly superior to other algorithms.
Exponential Stability of Numerical Solutions to Stochastic Investment System
Authors: Wang Zhan Ping
Published: November 2010

The investment model of stochastic neutral technical progress is given in this paper. The main purpose of this paper is to consider the exponential stability of the Euler-Maruyama scheme for a class of stochastic investment system. The de¯nition of exponential of numerical methods is established. The conditions under which the method is exponentially stable in mean square determined.
A Novel Combination Method of Conflict Evidence in Multi-Sensor Target Recognition
Authors: Xiong Yan Ming , Yang Zhan Ping
Published: November 2010

A novel combination method is proposed in order to efficiently combine conflict evidence. The credibility of the evidence is derived by introducing a distance function, and the conflict probability is distributed to every proposition according to its credibility. Better performance is demonstrated by numerical examples compared with three other methods.
Studying of Fuzzy Logic Control for Semi-Active Suspension Based on Improved Genetic Algorithm
Authors: Zhang Jing Jun , Xu Zhi Qiang
Published: November 2010

Establishing a 2-DOFs of 1/4 semi-active suspension system model, using genetic algorithm approach, to design fuzzy logic controller of the semi-active suspension and simulate in the environment of Matlab/Simulink. The results of being compared with the passive suspension demonstrate is that this developed fuzzy logic controller based on genetic algorithm enhances the performance of the full car suspension system significantly.
The Typical Wetland Biological Environmental Monitoring System Based on ZigBee and GPRS Wireless Sensor Network
Authors: Liu You Zhou , Zeng Yong , Yi Ning
Published: November 2010

For the complexity of the environment system,a wireless sensor network paradigm based on the technique of ZigBee and GPRS for wetland detection in real time was put forward according to the factors of wetland environment. The architecture of wireless sensor network for wetland environment detection was described also. And the hardware circuit of networks’node was designed based on the chip of CC2430 in this paper , as well as the process of data transmission was discussed in detail . Some environment parameters such as temperature, humidity, etc. in the wetland region can be monitored real-timely. After all, it should be useful for needs of the wetland conservation. Science and technology support projects in Jiangxi Province, Jiangxi Science Planning Projects funded
Research of Seed Levitation Based on Magneto-Archimedes Effect
Authors: Li Shi Peng , Zhang Wei Ping , Hu Mu Feng , Chen Wen Yuan , Cui Feng , Liu Wu
Published: November 2010

In this research, the principle of diamagnetic levitation is described briefly. The application perspectives of diamagnetic levitation and its advantages are as well discussed. By utilizing the magneto-Archimedes Effect to lift different seeds, the experimental procedures and parameters are provided which include magnetic characteristics of magnets and ratios of magneto-Archimedes solution. The theoretical derivation and finite elements simulation of force when the seeds suspend are conducted. These resolving formulas, methods of numerical simulation as well as means of experiments are meaningful as reference to the researches in this field.
Benefits Assignment Mechanism for Construction Machinery Supply Chain Based on Improved Cooperative Game Model
Authors: Ma Xin
Published: November 2010

Benefits assignment in the construction machinery supply chain business cooperation is the crucial and the most prominent conflicts issue, it plays a decisive role on sustained and stable development of cooperative relations. In this paper, the cooperative game theory and methods applied to the benefit assignment in the construction machinery supply chain management, and on this basis, the benefits of various cooperative enterprises are assigned by a comprehensive cooperative game model with the Shapley value model including risk of correction factor and the investment weight correction factor according to investment in the construction machinery supply chain, while a numerical example to demonstrate the method of science and rationality.
The Forecast Model of China’s B2B E-Commerce Transactions
Authors: Liao Zhi Gao , Liu Wen Fang , Wu Shang Jun
Published: November 2010

Since the Internet users in China increased gradually, we use the Bass model to forecast the number of the Internet users in china in the following years, and establish the model to forecast the B2B e-commerce transaction volume of China. With the estimation of model parameters, we analysis the reasons of the E-commerce development in china, and give some policies or proposals which might be help for the high-speed development of the E-commence in China.
A Micro Diamagnetic Actuator for Micro Beads Levitation and Manipulation
Authors: Wang Qun , Zhang Wei Ping , Chen Wen Yuan , Cui Feng , Li Shi Peng , Liu Wu , Wu Xiao Sheng
Published: November 2010

An efficient and convenient way to levitate and manipulate micro beads is reported, in which coils and soft magnetic materials are used to generate a magnetic field. The levitation is based on diamagnetic buoyancy, and the main structure of this device is made into spiral switch arrays so as to simplify the interconnection and magnetic field control. The design, modeling and fabrication of the device for manipulation of diamagnetic beads is given in detail. Theoretic analysis and experimental results of fabrication indicate the advantages and feasibility of the proposal illustrated here.
Human-Computer Interface Design for Simulation of Activity-Travel Patterns
Authors: Wang Bin , Zhang Lin , Cao Hui Yun
Published: November 2010

Time-space patterns of activity-travel are very complex, because the individual movement in time-space is a complex trajectory with many interacting dimensions. Potentially huge amounts of time-space data will be collected for different purposes by GPS receivers, and existing analytical tools in GIS may prove to be insufficient to handle these data. The purpose of this paper is to design a human-computer interface to model and visualize mobile objects with GPS data, in order to find an effective method to construct interactive manipulative 3D-GIS software of activity-travel patterns. The methods of 3D geographical data gathering and 3D map modeling are also present to support the analysis, display, and animation of time and space data. A prototype was implemented using the software of Multigen Creator and Vega to analyze GPS-recorded travel data in the city of Changchun, China. It allows the user to interact and explore the 3D map. Not only the visual properties of objects can be altered to reflect their various attributes, the highly flexible viewing and navigational environment is also a great help to the users.
A New Approach of Combined Shape and Gauge Control
Authors: Zhang Xiao Ping , Zhi Chang Jian , Sun Bao , Du Xiao Zhong , Zhang Jin Zhi
Published: November 2010

Due to the coupled function of shape and gauge control in rolling process, mutual effects must be considered when shape control or gauge control is carried out. Traditional shape and gauge control theories are of independent and the control systems are also separated, so it is difficult to ensure the quality of shape and gauge simultaneously. Based on the updated shape theory and a single parameter model of load distribution method, a combined shape and gauge control method was developed, which can adjust rolling regulations on-line according to the deviation of strip crown measured at the exit of the rolling mill. The method can ensure gauge precision while strip crown is adjusted and the purpose of combined shape and gauge control is reached.
Research on Energy Equation of Lubrication Model on Large-Scale Journal Bearing System
Authors: Wang Jian Mei , Huang Qing Xue , Kang Jian Feng , Fan Yang
Published: November 2010

To prolong the service life of large-scale journal bearings, the major factors that have influences on bearing performances should be taken into account. By consideration of the variations of viscosity and density with pressure and temperature, a more thorough thermo-hydrodynamic lubrication model was established. With designation of variables with nondimensional parameters, a series of equations were nondimensionied, and the corresponding energy equations at different oil-film layers and boundaries were obtained respectively according to proper difference formats, and then solved by the integration of Finite Difference Method (FDM) with Boundary Element Method (BEM). Calculation results have proved that such complete mathematical model could provide great theoretical guide meaning to improve the lubrication performances and to prolong the service life of contact components of heavy journal bearings.
Nonlinear Spline Method for Buckling Analysis of Steel Strip
Authors: Qin Jian , Zhang Qing Dong , Dai Jie Tao
Published: November 2010

The paper deals with numerical considerations of buckling phenomena in steel strip during rolling and leveling of sheet metal. The self-equilibrating stress states due to residual strains caused by the rolling process are calculated by the spline function method. The developed numerical model provides an estimation of buckling critical loads and wave configuration. It is shown how the waves observed on the strip sliding over or lying on a rigid plane, so one can provide information about the distribution of the differences in the plastic strains over the width of the strip which leads to the buckled configuration. The spline function method proposed in this paper is simpler and more convenient than traditional finite element method in the buckling analysis.
Key Equipment and Innovative Technology for Tempering of Super Thin Strip
Authors: Ding Wen Hong , Xia Jun Yong , Li Yu Qing
Published: November 2010

Super think sheet are high value added products among other cold rolled products. The production process and production equipment are difficult to develop and not easy to be understood and mastered. For a long time, they have been in monopoly of other countries. To address the problems existing in conventional temper mill for super thin strip rolling, three main technologies are applied to the new design and to the manufacturing. They are: a. technology for stabilizing product performance; b. technology for surface quality control and c. technology for improving yield and productivity of the line. These technologies successfully eliminate the difficulties of stabilizing mild steel performance and improve the surface quality and line productivity. Significantly, a serious of technical problems for conventional super thin strip temper mill are solved through indigenized technologies.
Analysis of the Mill Roller Bearing Using Mixed Fast Multipole Boundary Element Method
Authors: Huang Qing Xue , Gui Hai Lian , Fan Fei , Song Tao
Published: November 2010

A new method named mixed fast multipole boundary element (MFM-BEM) is introduced in this paper to solve the contact problem of mill roller bearing. Incompatible elements and compatible elements are used to construct shape functions in non-contact area and contact area. On the one hand, MFM-BEM avoids satisfying the conditions of precise coordination in compatible elements, on the other hand, this method retains the merits of fast multipole boundary element method (FM-BEM). Through numerical examples, it clearly demonstrates that the calculation time and accuracy are improved. MFM-BEM provides an efficient numerical method for designing and analyzing the mill roller bearing. It also provides theoretical basis for prolonging mill roller bearing service life.
Asymmetric Shape Control Theory and Practice in Cold Strip Mills
Authors: Wang Xiao Chen , Liang Zhi Guo , Yang Quan , Du Xiao Zhong , Liu Hua Qiang , Zhang Yun
Published: November 2010

In cold rolling process, asymmetric shape defects are still a common problem to strip quality. For the mills with inverse symmetry roll shifting system, different roll wear and thermal contour of top roll system and bottom roll system could cause asymmetric shape defects during shifting operation. In this paper, three dimension finite element simulation models of inverse shifting roll system were established to calculate the parameters and to analyze the effects. Based on the idea in the mill engineering that mill style option depended on the product grade, shifting weakness was evaluated and the opinion of limit shifting was suggested. To improve control effect to asymmetric shape defects in cold rolling, shape control system with asymmetric shape control ability is developed, including asymmetric edge drop control at upstream stands and asymmetric flatness control at last stand. The further improvement of asymmetric shape control theory and practice is the key way to reach the higher precision of shape quality in cold strip mills.
Research on Rolling Model Based on Non-Circular Contact Arc for Cold Strip Temper Rolling
Authors: Yu Meng , Zhang Qing Dong , Wang Bo , Zhang Xiao Feng , Peng Jian
Published: November 2010

During temper rolling, the reduction is small, the length of contact arc is short, and the elastic deformation of work roll is large. Roll shape is not circular arc, the assumption of circular roll shape is no longer applicable. In this paper, quintic B-spline function is used in interpolation operations with normal pressure distribution so that roll shape can be solved by Gaussian integration. And a rolling model based on non- circular contact arc for cold strip temper rolling is established. The calculated results show good agreement with the actual value. The model can meet manufacturing requirement of the field and receives better control effect of elongation.
Numerical Simulation of Cold Roll Forming by the Non-Uniform Finite Strip Method
Authors: Ma Li Dong , Liu Cai , Meng Zhi Juan
Published: November 2010

Cold roll forming is a very complicated non-linear process of geometry, materials and contact. Based on the Updated-Lagrangian method, a theoretical model of the non-uniform finite strip method is presented in this paper. The method is employed to analyze the forming process of U-channel section steel, and the three-dimensional displacement field, the stress field and the strain field of whole process have been established. This research work will lay the foundation for the CAD/CAM high technology of a cold forming roll.
The Development and Application of the Hot-Rolled Plate Ultra-Fast Cooling Equipment
Authors: Yuan Guo , Wang Guo Dong
Published: November 2010

The ultra-fast cooling technical is a newly developed thermal technical in recent years for the hot-rolled steel plate. The key to develop the ultra-fast cooling equipment are the design of the nozzle structure and the cooling process. The heat exchange mechanism of the jetting impingement heat transfer mode was illustrated during ultra-fast cooling process for the hot-rolled steel plate in this paper. The flow field characteristics and the cooling technological process during the plate ultra-fast cooling process were simulated. And the newly-developed ultra-fast cooling equipment for the hot-rolled plate and its application were also introduced in this paper.
Finite Element Analysis of Contact Stress between Rolling Mill Pressure Screw-Pairs
Authors: Wang Zheng Yi , Jiang Lian Yun , Zhao Chun Jiang
Published: November 2010

Owning to the unreasonable structural design of the rolling mill’s pressure screw, there is severe stress concentration on the top and the root of the screw thread, which make their abrasion seriously. Therefore the service life and accuracy of the pressure screw will decrease a lot. In the article, based on analysis of the structural parameters and material parameter of the pressure screw, we get the factors which will affect the contact stress between the screw thread. By the method, the contact stress between the screw thread is well-distributed, which will helpful for the designers
Numerical Simulation on Velocity Profiles of Mill Bearing Lubrication
Authors: Huang Qing Xue , Wang Jian Mei , Li Yu Gui , Ma Li Feng , Zhao Chun Jiang
Published: November 2010

No 460 oil-film bearing oil as the dedicated lubricant is regarded as the incompressible Newtonian fluid. To comprehensively analyze the real oil flow state, the mathematical model on velocity profiles, together with its dimensionless equations, is established, and the calculating program is developed to simulate the 3D velocity profiles and velocity gradients at different oil flow layers. The relationship between velocity profiles and the oil film pressure is discussed, and the velocity tendency is consistent with the general velocity profile of wedge cross section. The conclusions are beneficial to the further study on lubricating performances of heavy contact components and to prolong their service lives.
Study on Strengthening Mechanism of Cd Additions for AZ31 Magnesium Alloy
Authors: Gao Shan , Xia Lan Ting , Wu Zhi Sheng , Li Hong Zhan
Published: November 2010

The effect of Cd on the microstructure and mechanical properties of AZ31 magnesium alloy has been investigated in this paper. The results indicate that the microstructure of the AZ31 magnesium alloy is refined obviously by adding a little Cd. When 0.7%Cd is added, the alloy is made up of Al-rich α-Mg matrix and the phase of β-Mg17Al12 which distributes and disperses in the matrix uniformly. Cd solid dissolves in the matrix and there is no new phase formed, which contributes to the increase of the impact toughness, Brinell hardness, tension strength and elongation of the experimental alloy by 68.6%,10.3%,9% and 35%,respectively.
An Improved Element-Free Method for Compressing Cylindric Tube
Authors: Hu Jian Hua , Shuang Yuan Hua , Yang Xiao Cheng
Published: November 2010

In this paper, a description about improved element free Gerlink method (EFGM) is given. The method adopted penalty method to implement the essential boundary condition. The integral scheme takes Gauss background integration. Based on compressing the cylindric tube, the numerical model is calculated by finite element method (FEM) and EFGM. Comparisons of the deformation shape and stress of the both simulations showed good accordance. The numerical solutions show that the present method is a robust, reliable, stable mesh free method and possesses better computational properties compared with traditional FEM.
Research on Influence of Fatigue Life from Variable Cross-Section Strut-and-Tie Transition Zone Radian
Authors: Hang Gang , Wu Jin Fu
Published: November 2010

There is so much influence to the fatigue life of the whole structural component from cross-section transition zone radian, and more than 100 times difference is made by different structural details for fatigue life [1]. According to structure and features of variable cross-section strut-and-tie,combing with its’ geometric properties and applied stress ways, at the basis of nominal stress method, the fatigue life of variable cross-section strut-and-tie is analyzed in the paper. Then, transitional zone is improved and fatigue life is analyzed. At last, the improved is compared with previous structure and analysis of Influence of fatigue life from variable cross-section strut-and-tie transition zone radian in theoretical. The conclusions of this paper guide other similar researches.
Non-Uniform Deformation Characteristic of in 690 Superalloy Tube in Glass Lubricated Hot Extrusion
Authors: Sun Chao Yang , Liu Bin , Zhang Qing Dong , Li Rui
Published: November 2010

A two-dimensional axi-symmetric finite element model for the tube hot extrusion process was developed based on Deform-2D software by consideration of the billet transfer, glass lubrication and the constitutive characteristics of IN 690 superalloy. An enhanced technique for adaptive mesh refinement (AR) is used to solve the large deformation problem. This model was then used to study the effect of boundary conditions and process parameters in tube hot extrusion. The Non-uniform deformation index as the representative parameter, which denotes the non-uniform deformation during the steady state of tube hot extrusion, is presented accordance to the feature of metal flow at deformation zone. The bigger of Non-uniform deformation index, the worse of non-uniform strain distribution. When the non-uniform deformation index getting smaller, the equivalent strain distribution along the length and cross section become more uniform and better product quality could be obtained. An increase in the billet and die preheating temperature could reduce the non-uniform deformation index individually. But the billet and die preheating temperature should not be too high. The increase of friction coefficient, the non-uniform deformation index also increased, which indicate appreciable results of metal flow. With the ram speed increase, the non-uniform deformation index decreases, but too fast speed is inadmissibility.
Study on Wear-Resistant Steel Quenching Deformation
Authors: Bian Xin Xiao , Ma Yong Jie , Li Mou Wei
Published: November 2010

This paper is based on the wear-resistant steel NM360 quenching experiments, simulates the steel plate quenching transient temperature field, and analyses the causes of quenching deformation. According to the experimental analysis, the martensitic phase transformation is the main reason of the wear-resistant steel quenching extremely easily deformation, therefore, how to control the time and stress of martensitic phase transformation of the plate surface is the key factor. Through experiments, we found a quenching process of controlling effectively quenching deformation, and it provides some practical experiences for acquiring the higher mechanical properties of this kind of wear-resisting steel.
Shear Stress and Deformation Analysis of Static Bonded Multi-Layer of Pyrex7740 Glass and Aluminum
Authors: Liu Cui Rong , Jia Tuo Sheng , Meng Qing Sen
Published: November 2010

In this paper the technological experiments of static bonding has been carried out in the bonding of multi-layer Pyrex7740 Glass and Al. The joining mechanism is analyzed with SEM and EDX. It’s observed that bonding region across the interface consists of the metal layer, oxide transitional layer and the glass layer. The bonding process can mainly be categorized into anodic process and solid state diffusing process. The pile-up of the ions and its drift in the interface area are the main reasons for anode oxidation and joining successfully. The analysis of the shear stress and deformation in the static bonded samples was made by MARC. Modeling studies showed the maximum shear stress of bonded samples all occur in the transition layer. It also shows the shear stress and deformation in the three-layer samples is significantly smaller than that in the two-layer samples. This has an important advantage in MEMS fabrication.
The Study of Fulcrum Distance in the Pressure Straightening Process
Authors: Tian Ya Qin , Wang Zhi Fei , Huang Qing Xue , Li Jin Bao
Published: November 2010

In order to study the impact of fulcrum distance on the straightening the minimum fulcrum distance was determined based on the plastic theory according to straightening pressure force in the process of straightening process where there was no indentation. The optimal distance between the fulcrums straightening has been studied by using of bending curvature changes in the bending deflection formula and support the relationship between the dot pitch. Given initial deflection according to bending deflection and bending deflection the amount range of the fulcrum distance can be determined during the pressure straightening. When the rate of bending deflection determined it can obtain the fulcrum distance at the same curvature. The more fulcrums distance the more bending deflection. The minimum fulcrum distance was three times the power growth with the diameter of work piece. The minimum fulcrum distance is inverse proportion to contact area of pressure head. With the pipe wall thickness decreases the minimum distance also reduced.
Research on Automatic Tracking Technology and Improvement Model of Plate in Leveling Region
Authors: Li Hong Jie , Huang Qing Xue , Gong Xiu Lian , Ju Chang Jiang , Wang Jian Mei , Jia Zhen Hong , Zhang Zhi Qiang
Published: November 2010

Steel plate automatic tracking is the key to achieve the whole process of automatic control and the whole heat treatment line level-3 process control for leveller, such as the process layout of leveling region, automatic tracking and control system, control system network structure for leveller etc. This paper paid special attention to the detailed technological analysis of the plate of leveling region to achieve automatic tracking process, and introduced the new control mathematical model that contained the roller’s orientation. By test validation and more practical application of the full-hydraulic leveling, lots of data has shown that the method is accurate and reliable.
Calculation of Cutting Force for Drum Type Arc Flying Shear
Authors: Xia Jun Yong , Ding Wen Hong , Li Zhang Yi
Published: November 2010

Taking drum type flying shear as the subject, this paper firstly analyzes the position relation between shear blade and strip. Then it deduces the formula for calculating contacting arc length between shear blade and strip, formula for calculating blade inclined angle and formula for calculating blade gap. Then, cutting force of drum arc flying shear is calculated with the formula, which was used for calculating cutting force of slanting blade. Program is made with help of MATLAB software to realized parameterized design of drum type flying shear.
The Design and Implementation of Leveling Model and Data Analysis System of Eleven Roller Leveler
Authors: Hu Ying , Hao Xiao Hong , Huang Qing Xue , Wang Qiu Shu , Jin Shao Zhen , Yang Hong Guang
Published: November 2010

For establishing an automatic process control and management system of leveler, we need to combine the software of the automatic process control and the software of real-time data management system. This article introduces something about the Leveling automatic process model, which include software’s structure, configuration, working principle and achievement. What's more, this system achieved the data management of leveling process and introduced the system configuration, functional structure. The whole system has been applied in multiple leveler and obtained good results, improving the system automation and straightening accuracy.
Design Considerations in High Strength Plate Leveler
Authors: Zhou Cun Long , Liu Hui , Huang Qing Xue
Published: November 2010

The higher the output of high-strength plate is, the higher the demand flatness of users will be, but there are some questions in designing high-strength plate leveler now: the first is no enough conditions in traditional parameters calculation formula, the second is neglection of elastic recovery in elastic-plastic bend deformation in plate leveling process. This research, which aims to level plate with yield strength 1200MPa, will amend traditional analytic formula and calculate leveler roller pitch and roller diameter, and can help design the high strength plate leveler.
Industrial Test on Shearing Force of Rolling Shear
Authors: Ma Li Feng , Wang Jian Mei , Huang Qing Xue
Published: November 2010

The accuracy of the max shear force of rolling shear is of vital importance to the proper selection of motor power and the optimization design of structure strength. The test on shear force during the shearing process of stainless steel was done on 3000 mm cut-to-length rolling shear of some Large-scale Iron & Steel Co., Ltd. The test results have shown that the weight of upper-blade carrier can bring about the fluctuation of measuring signals of shearing force at the start and end instants. Meanwhile, the shear force during the shearing process will gradually increase with the increment relative cut-in depth, and the process from the bite-in of upper blade into steel plate to the fracture of steel plate is very short, thus the link force on the side of firstly-fallen-off blade will initially increase and then will decrease by large increment amplitude. The shear force at the cut-in stage will dramatically increase. During the cut-in stage, the shear force is basically a constant due to the constant shear angle. In summary, the above test results have important referential value to the calculation of shear force and the design of structure strength.
FEM Analysis of Bottom Cassette of Plate Roller Leveler
Authors: Liu Song , Huang Qing Xue , Zhou Cun Long , Gao Cong Min
Published: November 2010

Strength and stiffness of the bottom cassette of plate roller leveler will have a direct impact on the leveling capability and the quality of product .To solve the problems that the plate leveler in some plant mills is unable to meet the design capacity and the roll set deforms severely, the model of the bottom cassette modeled by Pro/E is imported into ANSYS code to be analyzed in this paper. The calculations locate the causes of the problems and propose an improved scheme. The method can help others complex equipments design.
Variational Method for Percussion Motion of a Non-Ideal Constraint System
Authors: Yao Wen Li , Gao Lu Lu
Published: November 2010

The purpose is to study the variational method for impact problem of a non-ideal constraint system. Compared to an ideal constraint system, a non-ideal constraint system has more practical engineering background, but it contains unknown non-ideal constraint forces, which usually can be written as the function of ideal constrained forces. The existing analytical method on ideal constraint systems does not contain constraint forces. The non-ideal constraint forces are considered for impact problems in the variational principle, and then by method of Lagrange multipliers, equations for impact motion of a holonomic system and an expression of the kinetic energy variation during the impact motion are obtained.
The Study of Online Detecting Technique of Steel Production Based on Laser Structured Light
Authors: Liang Zhi Guo , Wang Xiao Chen , He Fei
Published: November 2010

As the detecting method of structured light, linear laser has been widely recognized in theory, but there still exist some problems when it comes to its application in industrial production. Based on the needs and features of steel bar and wire rod production, the present paper proposes the online detection of steel bar and wire rod’s cross-sectional shape and size by using linear laser as the structured light. Meanwhile, the present paper applies such a detecting method to the online detection of continuous casting billet’s size and the online automatic counting of steel bar and wire rod. Moreover, the validity and accuracy of the proposed detection are verified by experimental device and project cases.
Artificial Intelligent Solver on Windscreen Wiper Mechanism of Automobile
Authors: Song Yan Dong
Published: November 2010

The power source of windscreen wiper is motor, which is the core of the entire wiper system and is very high quality requirements. The wiper motor installed on the front windshield and worm gears are generally made of one mechanical part. The four-bar linkage of windshield wiper of automobile is driven by motor through worm gears. The method of simulated annealing is a technique that has attracted significant attention as suitable for optimization problems of large scale, especially ones where a desired global extremum is hidden among many, poorer, local extrema. The simulated annealing algorithm with penalty strategy is adopted to solve the optimal model of windscreen wiper mechanism, thus motion accuracy of wiper mechanism is greatly increased, and the searching number is greatly decreased.
Four-High Cold Rolling Mill for Control of Edge-Drop and Thrust Force
Authors: Wang Jun Sheng , Yu Xiao Feng , Song Lei , Li Sheng Li
Published: November 2010

In the paper, control principle and working characters of T－WRS&C（Taper Work Roll Shifting and Crossing）cold rolling mill are analyzed. The working schedule and control parameters are worked out. The mill working modes are determined according to different working conditions. The taper work roll shifting is used for edge drop control and the work roll crossing is used for thrust force control when work rolls shifting. The actual application verifies that the edge drop and thrust force can be controlled effectively during cold strip rolling.
Feasibility Analysis for Large Rectangular Ingot Production by Intensive Cooling
Authors: Li Sheng Li , Ai Xin Gang
Published: November 2010

Lots of heavy plate mills more than 5m have been in operation, the design of corresponding large ingots becomes crying needs. In this paper, a special method of intensive cooling outside mould has been presented and applied to a designed 80t ingot (4200mm×1100mm×2600mm). Mathematical simulation results tell us that by intensive cooling, the solidification time of the 1100mm rectangular ingot can be shortened into 120min, which is only 1/4 compare with air cooling, internal soundness can be ensured also. The intensive outside cooling process can obviously improve microstructure and preventing skull patch by increasing the thickness of solidified shell.
Discussing the Effect of Different Modeling Methods on Bus Frame Modal Analysis Based on the Experiment
Authors: Han Tian , Jin Ling , Yin Zhong Jun
Published: November 2010

Using ANSYS to calculate modal of truss structure, which is similar to the bus frame, proposing the effect of different modeling methods on modal results and initial selecting the appropriate modeling method to this new type complex bus frame. The above-mentioned methods are used to create actual bus frame models and obtain the corresponding modal results. Then testing the accuracy of the results by modal experiment, to establish an accurate modeling method at last, this is laying the foundation for other analysis, and also providing reference for the similar frame structure.
Dynamic Recrystallization during Hot Compression Processes of 304 Austenite Stainless Steel
Authors: Zhao Xiao Dong , Liu Jian Sheng , Chen Hui Qin , He Wen Wu
Published: November 2010

Hot compression experiments of 304 austenite stainless steel were carried out with Gleeble-1500D simulator under the strain rates of 0.05 s-1~0.5 s-1 at 950°C~1200°C. The effects of temperatures and strain rates on flow stresses during hot compression deformation of 304 austenite stainless steel were investigated. The regression analysis of experiment data was used to evaluated the stress exponent and deformation activation energy, and fit the constitutive equation of the flow stress during hot compression of 304 austenite stainless steel. In addition, the kinetic model and the grain size model of dynamic recrystallization of the steel were obtained by use of the metallographic analysis of the microstructure. The results can provide theoretical basis for design of hot deformation parameters and prediction of microstructure of 304 austenite stainless steel.
Fesability Analysis of Solving Contact Problem of Roller Bearing by Finite Element Method
Authors: Wang Zhi Wei , Meng Ling Qin , Hao Wen Si , Zhang E
Published: November 2010

Contact problem is one of the most basic problems in the analysis of roller bearings, and the analysis and computation of contact stress and contact deformation are of great importance in roller bearing design. To solve the contact problems of roller bearing, we could use the Traditional method-- Hertz theory, the traditional method to solve the contact problems of roller bearings, is limited in the precision and unable to show the distribution characteristic of stress in contact area.In this paper, we use Finite Element Analysis software ANSYS to do research on contact problem of tapered roller bearing 3811/750/HC, and by means of comparison with the results gained by the Hertz theory we prove the feasibility of roller bearing contact problem by Finite Element Method. Hence, a more efficient method of improving the service life of rollers is got.
Test Analysis on Crack Propagation Rate of Axle Pipe Steel
Authors: Huang Zhong Guo , Dong Hong Lei , Yuan Qing Hua , Fan Jia
Published: November 2010

The crack growth rate test of XCQ16 and XCQ16-1 axle steels were introduced using MTS material test machine. The test data of the crack propagation rate of axle steels has been analyzed by Paris formula. The results showed the crack propagation rate test of XCQ16 was faster than XCQ16-1, and the fatigue residual of XCQ16-1 life is longer. The correlated coefficient of the experimental data indicates that the result of this paper is comparatively ideal and has reference value to appraising the life span.
A Study on Constitution Equation of Industrial Ti-6Al-4V for Gas Forming Process
Authors: Huang Zhong Guo , Jin Shun Yao , Yuan Qing Hua
Published: November 2010

An elevated temperature deformation test of industrial coarse-grained Ti-6Al-4V(TC4), which is for gas forming process, was conducted under the temperature of 880 ~ 980°C and the strain rate of 5×10-4mm/s, 1×10-3 mm /s, 5×10-3 mm /s, 1×10-2 mm /s. Based on the stress-strain curve of that material, the Johnson-Cook model, Exponential model, Series model, Parallel model and the Kumar model were established by using the regression analysis on stable deformation stage and whole strain stage (strain hardening stage plus stable deformation stage) respectively. The appropriate application circumstances of those models are analyzed. By using statistic analysis and aiming at minimizing the error rate between actual value and regression value, Kumar model is selected as the constitutive model of that material for gas forming test. Based on Kumar model, the industrial coarse-grained TC4 gas forming test was simulated by nonlinear finite element software Msc.Marc. The simulation results agree well with the actual parts. The Kumar model was appropriate and accurate.
Environmental and Economic Assessment of Recycled Aluminum Alloy Production - A Case Study of China
Authors: Hong Jing Min , Ismail Zainab Z. , Hong Jing Lan
Published: November 2010

A life cycle assessment was carried out to estimate the environmental and economic impacts of recycled aluminum alloy production. The impact seen from non-carcinogens, respiratory inorganics, terrestrial ecotoxicity, global warming and non-renewable energy categories played an important role to overall environmental impacts. The impact seen from carcinogens and aquatic ecotoxicity played relatively small role, while the impact seen from the rest categories affect the environment was ignorable. Specifically, the emissions from the aluminum and silicon production stages involved played an important role due to high energy consumption, while potential impact generated from other elements was quite small. Similarly, the cost of old aluminum scrap represented the dominant contribution to overall economic impacts. Accordingly, choosing natural gas based electricity production technology and improving old aluminum scrap consumption efficiency are the efficient way to minimize the overall environmental and economic impact, respectively.
Numerical Study on Effects of Molten Steel Flow about Different Blowing Argon Position in Ladle Furnace
Authors: Chen Yi Sheng , Pang Yun Ji , Zhang Xiao Guang
Published: November 2010

Based on momentum theorem, principle of mass conservation, and some experimental formulas, the distribution of velocity in ladle furnace was calculated by CFD methods. Blowing argon arrangement in ladle furnace is researched, through comparing 13 schemes about blowing argon arrangement, some conclusions are obtained. When there is only a blowing argon in ladle furnace, the better scheme is that the distance from center of LF bottom to the hole is 0.7r. When there are two blowing argon in ladle furnace, the better scheme is that the angle of two holes is 60°~90°and distance from center to blowing argon hole is 0.5r~0.7r.
Electrochemical Noise Analysis on Corrosion of Aluminum Alloy
Authors: Tian Zhi Qiang , Kong Xiao Dong , Wu Gang , Wang Yuan Sheng
Published: November 2010

The characteristic parameters of electrochemical noise (EN) spectra were used to study the corrosion process of aluminum alloy in distilled water with or without chlorate (Cl-).The experimental results showed that the parameters obtained from the time-domain spectra analysis were not consistent with the parameters obtained from the frequency-domain analysis. This paper attempted to explain the phenomenon by the time-domain noise spectra, the corrosion characteristic of aluminum alloy, the source of noise transient, and the types of the pitting corrosion of aluminum alloy.
Microstructures and Mechanical Properties of the Mg-xGd-Er (x=5, 7, 9 and 11wt%) Alloys
Authors: Wang Xu Dong , Du Wen Bo , Wang Zhao Hui , Li Shu Bo
Published: November 2010

In this paper microstructures and mechanical properties of the Mg-xGd-Er (x=5, 7, 9 and 11wt.%) alloys were characterized and discussed. The results show that the alloys with different Gd were mainly composed of α-Mg solid solution, semi-continuous network-like secondary phases of Mg5Gd and cuboid-shaped compound of Mg(GdEr). The ensile strength and yield strength increase as the content of Gd increase. This improved mechanical properties are mainly ascribed to the formation of network-like secondary phases of Mg5Gd.
Using CFRP to Repair the Steel Pipe with Fatigue Cracks
Authors: Zhang Hong Tao , Xue Xiao Xiang , Zheng Yan , Feng Peng
Published: November 2010

This paper provides a new method to repair the steel pipe with fatigue cracks by using carbon fiber reinforced polymer (CFRP). Cracks may arise in Pressure pipeline in service because of low cycle fatigue. Crack defect is the biggest problem, because crack will gradually propagate and seriously threaten the safe operation of pipeline. This paper provides a repair and calculation method for pressure pipeline with fatigue cracks, and some specific engineering cases are given based on this method.
Dynamic Visco-Elastic Properties of Polycarbonate (PC) under Static and Dynamic Load
Authors: Yin Shui Ping , Yu Min
Published: November 2010

The purpose of this work was to investigate the effects of pre-load static load and dynamic load on the visco-elastic in polycarbonate. In the paper, static-dynamic sweep experiment of polycarbonate was performed on EPLEXOR 500N, which was manufactured by GABO of Germany. The variation laws of storage modulus, loss modulus and loss tangent as changing dynamic load in a large range were systematically analyzed and the spectral characteristics of dynamic-viscoelastic under static-dynamic loads were obtained. The experiment results on dynamic visco-elastic under the high load shows that the load effects on dynamic visco-elasticity of polycarbonate performing on the changing of the dynamic visco-elastic parameters, storage modulus become lager with the increasing of static load and decreasing with the increasing of dynamic load, while loss tangent decreases with the increasing of dynamic load and varies in a more complicated pattern as the increasing of static load.
The Effect of Composition on High-Energy Laser Beam Combustion Synthesis of Fe-Al Alloys
Authors: Li Gang , Chen Yong Jun , Shui Dong Li , Tang Hai Peng , Liu Li , Hou Jun Ying
Published: November 2010

For Fe-Al powder compacts, using high-energy laser beam combustion synthesis preparation for Fe-Al alloy. The microstructure and properties were analysised by X-ray diffractometer, optical microscopy and abrasive wear testing machine.The result indicated that synthetic products deviate from the equilibrium state of the intermediate phase and Al-rich phase produced; With the increase of aluminum content, the content of Al-rich phase increase, raising the level of the sample density; With the increase of aluminum content,morphology from fine acicular,strip noticeable,flake lath to massive growth; Synthesis of Fe-70at% sample of its uniform and a high densification, it has excellent wear and corrosion resistance.
Influence of DepositionTemperature on Tensile Behavior and Fracture Characteristics of SiC Filament by Chemical Vapor Deposition
Authors: Liu Cui Xia , Yang Yan Qing , Luo Xian
Published: November 2010

CH3SiCl3-H2-Ar system was adopted to prepare SiC Filament of high tensile strength by high-frequency induction during Chemical Vapor Deposition (CVD) method. Room-temperature tensile strength of SiC filament prepared under different temperature was test. Crystal structure, surface morphology and fracture character of SiC filament was analyzed with “X-ray diffractometer and scanning electron microscope. Influence of temperature to final tensile behavior of SiC filament was discussed synthetically. The result shows that tensile strength is very sensitive to temperature. From 1000°C to 1400°C, tensile strength increases and then decreases as temperature increases. At 1200°C, tensile strength reaches its max value, the reason ofwhich is composed of three parts. The first one is that the deposited product is β-SiC. The second one is that surface of SiC filament is smooth. The third one is that fracture surface shows ductile dimples fracture, brittle fracture and cleavage fracture patterns. 1200°Cis considered as one reasonable temperature in our laboratory to prepare SiC filament.
A Study on Heat Treatment Effect and Mechanism of High-Pressure Vessel in the Wall Thickness Direction
Authors: Yuan Qing Hua , Jin Shun Yao , Huang Zhong Guo , Ren Xue Ping , Song He , Wei Jian
Published: November 2010

To understand the effects and mechanism of heat treatment to the high-pressure vessel performance, a series of different closed-shaped cavity heat treatment tests were conducted. Through tensile test, impact test, hardness test, OM and SEM test and so on, the heat treatment effects and micro mechanism of high-pressure vessel with different closed-shaped cavity were studied along the wall thickness direction. The results indicate that: with increase of volume of the closed-shaped cavity, the strength of container middle cross-section increases in the beginning and decreases afterward, the toughness falls first and then rises, and the plasticity changes little. The strength, plasticity and hardness increase gradually from inside to outside along the wall thickness direction. The hardness increases a little in the beginning, but then rises quickly when it comes close to the outer wall. After being quenched at 930°C and tempered at 580°C, the microstructure of the vessel material is mainly tempered sorbite. The structure grain boundary becomes more and more blur from inside to outside of the wall. Inner wall contains a small amount of residual austenite and tempered martensite. The fracture surface is toughness one.