bluuebunny/crossref_metadata_2025 huggingface dataset:
Synthesis of Ti2AlC and Ti3AlC2 by Mechano-Chemical Reaction and Hot Pressing Process
Authors: Liu Jian Ke , Yang Ruo Xin , Zhu Jian Feng
Published: December 2010

The mechanically induced self-propagating reaction (MSR) and hot-pressing consolidation were adapted to synthesize Ti2AlC and Ti3AlC2 using Ti, C and Al powder mixtures. The effects of Al content on the microstructure and mechanical properties of fully dense Ti2AlC and Ti3AlC2 were investigated. The results reveal that the Ti3AlC2, TiC and TiAlx transitional phases were formed by mechanically alloying according to the mechanically induced self-propagating reactions (MSR). Through hot pressing the as-milled powders with initial composition of 2Ti/1.5Al/C and 2Ti/Al/C, respectively, at 1100°C for 1 h, the desired high purity Ti2AlC and Ti3AlC2 were produced. SEM images confirmed that the as-fabricated Ti2AlC and Ti3AlC2 grains are plate-like with nanoscale layered structure and dispersed uniformly.
The Development of Nozzle Micro-Hole Abrasive Flow Machining Equipment
Authors: Li Jun Ye , Liu Wei Na , Yang Li Feng , Liu Bin , Zhao Lei , Li Zheng
Published: December 2010

Through analysis of abrasive flow machining principle, this paper explores the design of equipment which is suitable for nozzle micro-hole abrasive flow machining. Based on catia，a cad software, three-dimensional models of the parts are drawn and assembled together. Based on the Finite Element Simulation software ansys, the finite element analysis of the key components of the equipment can be achieved. Through the result of simulation, the design of the equipment is reliable, and is able to satisfy the requirements of strength and rigidity. It offers the theoretical basis for optimizing abrasive flow machining equipment. Through the result of tests, the system of the equipment runs steadily and the ideal abrasive flow machining effects can be achieved.
Molecular Simulation on Modification of Structure and Thermodynamic Properties of Montmorillonite
Authors: Dai Wei , Shui Zhong He , Li Kai , Duan Ping
Published: December 2010

Modification of structure and thermodynamic properties of montmorillonite is studied by molecular dynamics simulation. The simulation results show that the pure montmorillonite system is unstable in nature, while the structure of doping-modified montmorillonite is more stable. In simulation process, the activity between the molecule and impurity ions maintains strong synergistic effect, and the configuration of the analog system is energetically most stable.
Study on the Control System of the Electro-Controlled Steering Damper Based on Magnetorheological Fluid
Authors: Cao Jian Guo , Yang Xin Hua , Xu Jie
Published: December 2010

This paper introduces a kind of electro-controlled steering damper’s structure and working principle which uses the magnetorheological fluid as the working medium. In order to design the controll system of the electro-controlled steering damper, the model of the steering system and the damper based on magnetorheological fluid are established through the dynamic equations, and a PID controller is used. At last, the paper simulates the controll system using a simulation language Modelica on Works, which is a simulation flatform for comp lex physical system modeling and simulation. The results show that the damper can effectively increase the stabilizing speed of the steering system, decrease the over run of the vehicle’s yaw speed, and improve the vehicle’s steering stabilization, especially when the vehicle running in high speed.
Fracture Mode of E50 Solder Notched Bars at Low Temperature
Authors: Wang Wan Zhen , Zhang Dan Li , Huang You Qian , Hao Xu Chang
Published: December 2010

Fracture tests were performed on 20 notched bars fabricated from E50 solder at low temperature (-47°C~-43°C). The effect of notch radius, r, and notch depth, d, on fracture mode of E50 solder was studied. The experimental results demonstrate that cracks initiate at the center of notch section and the notched bars fracture at the notch section at low temperature. The fracture mode is cleavage fracture and the fracture sections are coarse. Specimens with a sharper notch radius (a smaller r) and a larger notch depth (a smaller d) show poor ductility, but high fracture strength. The stress-strain curve of E50 solder tested on standard specimen at low temperature (-47°C~-43°C) exhibits the character of yielding, hardening and necking. The ratio of ultimate strength to yield strength, σu/σy, and the ductility, δ5, at low temperature meet with the requirement in plastic design for structural steel.
Study on Numerical Simulation of Iced Conductor Galloping for Multi-Span Power Transmission Lines
Authors: Li Li , Cheng Zhi Yuan , Hu Zi Dong
Published: December 2010

The general expression of Lagrange nonlinear cable element is established firstly by using virtual work principle. On the basis of the theory, the specific expression of a two-node cable element having rotational degree of freedom is derived and the non-linear finite element model of multi-span transmission line for galloping analysis was established. In addition, the aerodynamic coefficient of iced conductor under different wind attack angle was obtained through computational fluid dynamics method. Based on the finite element model and aerodynamic characteristics of the iced conductor, the Runge-Kutta method was applied to carried out non-linear numerical simulation of iced conductor galloping and the Matlab program was compiled. The galloping of the multi-span transmission line crossing Hanjiang River was analyzed. The results indicate that the presented method can simulate the galloping process effectively and it can provide the basic references for further research of preventing galloping.
Analysis of Surface Morphology Characteristics in Mechanical Finishing and Electrochemical Mechanical Finishing
Authors: Zhen Heng Zhou
Published: December 2010

In this paper, surface morphology characteristics of mechanical finishing (MF) and electrochemical mechanical finishing (ECMF) for 45# steel was investigated. The microcosmic geometry parameters were measured by Surfcorder SE-3H. Compared with original surface, the surface morphology characteristics of the workpiece machined by MF and ECMF have been analyzed with auto correlation function (ACF). The results show that there exist periodicity component in surface profile before and after finishing. The auto correlation curves of ECMF surface have a smaller average period compared with MF surface. The low-frequency component and the mean ripple peak distance of original surface profile are obviously decreased. Furthermore, the ripples and peak density are increased, ECFM have a higher efficiency compared with MF, and the surface roughness Ra is decreased from 0.231μm to 0.032μm in 1 minute. The results indicate that surface quality, material ratio of the profile and wear resistance machined by ECMF are improved obviously.
Exploration of Teaching System Reform in Modern Engineering Graphics
Authors: Zhong Shan
Published: December 2010

Introducing three-dimensional modeling technology into the teaching of modern engineering graphics is a hot topic for graphics areas in recent years. Three-dimensional geometric modeling principles, methods, and skills will be integrated and infiltrated to modern engineering graphics course, and this will form a new teaching theory, content and process with modern engineering graphics teaching trends. The teaching reform of modern engineering graphics in the three- dimensional modeling environment must be imperative. This paper analyzes the shortcomings of a traditional teaching system, and explores the teaching mode which three-dimensional modeling is as the mainline and integrates two-dimensional design. Also proposes a combination of teaching methods, and makes the exploration of teaching reform.
Hybrid Mean Particle Swarm Optimization Algorithm for Permutation Flow Shop Scheduling Problem
Authors: Zhou Yong Quan , Huang Zheng Xin , Du Yan Lian , Gong Qiao Qiao
Published: December 2010

This paper presents a new hybrid mean particle swarm optimization algorithm with improved NEH heuristic approach and local search strategies by using an immune mechanism. This hybrid mean particle swarm optimization algorithm is used for permutation flow shop scheduling problems. Finally, twenty-five problems are used to test the performance of the algorithm, the experimental results show that the proposed approach is an effective and practical.
Imitation Study of Hybrid-Driven Five-Bar Mechanism Output Movement Characteristic Based on Kinematics Analysis
Authors: Shan Ning
Published: December 2010

Hybrid-driven five-bar mechanism that combines the motions of two characteristically different motors can attain the flexibility output movement. Its structure is simply and it has low cost. Therefore it is widely used manufacture fields. In this paper, the kinematics mathematic model of plane closed-loop five-bar mechanism is established according to the model-transforming method and closing-vector method. And expressions of its output movement parameters are attained. The output movement characteristic of hybrid-driven five-bar mechanism is imitated and studied. The results show that hybrid-driven five-bar mechanism which its geometry parameters confirmed can accomplish diversiform tasks through changing its input movement rule. Output movement track of hybrid-driven five-bar mechanism changes along with the original position of two input components changing. It indicates hybrid-driven five-bar mechanism can accomplish many group tasks at one time.
Study on Manufacturing Craft of Wood-PSt Composite
Authors: Lv Duo Jun , Li Yong Feng , Jiang Chi , Zhang Yue Hong , Liu Yi Xing
Published: December 2010

A novel wood-based composite, Wood-PSt Composite, combining both advantages of wood and polymer was fabricated by impregnating styrene monomer into wood pores, followed by in-situ polymerization through a catalyst-thermal treatment inspired from the special porous structure. The manufacturing craft involving the impregnating craft and the polymerizing craft was studied and its structure was also observed by SEM. The analysis results indicated that the optimum impregnating condition was pressure: 0.5MPa, and time: 20min; and the monomer loading linearly correlated with pressure described as Y=201X+8.9, and linearly correlated with time described as Y=3.4X+31.4, respectively. The optimum polymerization craft was temperature: 80°C, time: 8h and AIBN: 3%. SEM observation showed that polystyrene generated in situ wood cellular structure and filled up wood pores under the optimum impregnating and polymerizing crafts, which was in accordance with the optimum manufacturing craft.
Study of Vehicle Interior Annoyance Based on Different Exhaust Configurations
Authors: Jin Chang , Zhou Hong , Hou Yan Fang
Published: December 2010

Five different exhaust configurations were installed on the vehicle respectively and binaural sound signals at rear left passenger under ten operating conditions were recorded as subjective evaluation samples. Paired comparison method was introduced to subjectively evaluate the annoyance of these sound signals. Evaluation data was studied using Ranking-based and Bradley-Terry model fitting approach respectively and the correlation analysis showed excellent consistency between them. Accordingly interior subjective annoyance of different exhaust configurations was obtained and the best one was identified.
Micro CO2 Sensor Based on Li2CO3, Pt | Li3PO4 | Pt, Li2TiO3-TiO2 Structure
Authors: Wang Hai Rong , Ren Jun Qiang , Sun Guo Liang , Cen Di
Published: December 2010

This paper presents a micro solid electrolyte CO2 gas sensor in which Li2CO3, Li2TiO3-TiO2 serves as sensing and reference electrodes respectively, and the Li3PO4 film acts as the electrolyte. The sensor was constructed in the sequent layers of O2, CO2, Li2CO3, Pt | Li3PO4 | Pt, Li2TiO3-TiO2, O2, CO2 on the Al2O3 substrate by MEMS process. Experimental results indicate that the micro solid-electrolyte CO2 gas sensor has a relatively rapid speed of response. By discussions, we may find that the improved performance will be realized by optimizing the primary parameters of the sensor.
Study of Multi-Roll Stretch Forming Process Using Different Clamps
Authors: Zhang Hao Han , Li Ming Zhe , Fu Wen Zhi , Hu Zhi Qing
Published: December 2010

Multi-Roll Stretch Forming process is a new flexible process which is used in forming hyperbolic-degree surface pieces. A series of finite element simulations and experiments have done for the process of forming saddle-shaped parts using two kinds of clamps named Tooth-type clamp and Wave-type clamp. The results show that Wave-type clamp can control the stretching force at an appropriate value. When the stretching force exceeds a critical value, the sheet metal can flow to the opposite direction of Stretch Forming as to maintain that stretching force. The formed part using Wave-type clamp has a better quality than the parts formed using Tooth-type clamp.
Structure Design of pin Round Punch for Stamping Stainless Steel Sheets
Authors: Wang Ke Sheng
Published: December 2010

To solve the fracture problem of pin round punch when stamping small holes on stainless steel sheets, the retaining structure was analyzed and the structure optimization design of pin round punch was presented. It is shown that during stamping stainless steel sheets, it can prevent pin punch from being fractured effectively by adopting clearance fit between pin punch and retainer plate, precise guide of stripper plate and making working part free in the stripper plate .The optimization results show that the B-type round punch is better than A-type in resisting fracture, and the resistance fracture capability of pin round punch is the best when the transition radius between guiding part and working part is R10mm. Aimed at pin punch damaged in biggish progressive dies, the quick replaced structure is designed, which can replace the pin punch in 3 minutes. So this type of structure can save time very much.
Research on Forming Technology of Electron Beam Selective Melting for Ti-6Al-4V Powder
Authors: Qi Hai Bo , Ren De Liang , Zheng Ming Jun
Published: December 2010

Electron beam selective melting (EBSM) has many advantages for the titanium alloy parts manufactured, therefore, the material characteristics, scanning methods and the tensile properties of Ti-6Al-4V by EBSM are studied in this paper. Aimed at the lower density, poorer electric and heat conductibility of Ti-6Al-4V, three scanning paths have been developed: reverse scanning, interlaced reverse and orthogonal scanning, and the surface of forming part made by the above three scanning methods is smooth and no bulge. The tensile specimens of Ti-6Al-4V are produced by EBSM, the average of ultimate tensile strength and the fracture elongation of the specimen are 1080MPa and 10.10%, respectively.
Research on NC Technology for High Speed Milling
Authors: Zhao Zhen Yu , Huang Li Xin , Xiao Yong Shan , Liu Bai
Published: December 2010

In the manufacturing industry, high speed milling plays a very important role. The paper introduced a number of essential core component of the key technologies in high speed machining center such as powerful computer numerical control systems, motion control card, post –processing method, processed trajectory control technology (Look Ahead) and high speed processing of programming. The speed control, post processing and look-ahead control are focused on considering, and the corresponding improved methods are brought forward.
Microstructures and Mechanical Properties of Si and Sb Added Mg Alloy
Authors: Hu Yong , Rao Li , Yan Hong
Published: December 2010

The effect of Si and Sb on the microstructure and mechanical properties of AM60 magnesium alloy has been studied. The results indicate that Si addition introduces Chinese script type Mg2Si phase at the grain boundary and increases the ultimate tensile property and hardness except the elongation of AM60 magnesium alloy. The Chinese script type Mg2Si phase changes to a fine polygonal shape and the grain sizes decreases by addition Sb. Sb addition increases the mechanical property of the alloy.
Research on Compressive Performance of Honeycomb Paperboard
Authors: Chen Qiong
Published: December 2010

Compressive performance of honeycomb paperboard was studied by way of FEM and verified by experiment. First, the collapsing process was divided into four parts: linear elastic phase, elastic-plasticity phase, plasticity collapse phase and densification phase. Second, the models were built on the FEM software and analyzed their nonlinear collapse process. It could be known that: the damage started in the intermediate region of honeycomb core; the collapse process met the theory analysis; the models with different side length of paper-core had a bearing up on compressive strength. At last, the results were verified by experiment, which was bigger value due to air and glue water existed in honeycomb core.
Research on Unwinding Tension System Control Based on Inverse System Theory
Authors: Li Jian , Mei Xue Song , Liu Shan Hui
Published: December 2010

In the printing process, it mainly depends on the stability of systematic tension control to ensure the quality of print. Meanwhile, systematic tension is mainly created from unwinding section, from which it is easy to cause fluctuation and variation of tension. Hence, how to maintain the stability of the tension in unwinding system has become a key problem to tension control system. Unwinding system is a typical multi-input-multi-output, nonlinear and strong coupling system. It is difficult to control with the traditional design method. In this paper, we realize the system’s decoupling and linearization based on the inverse system theory, which make the system change from a coupled and nonlinear system to two order pseudo-linear systems after a series of control variable transformations. We introduce active-damping into the pseudo-linear system to overcome the zero-damping and enhance the ability of disturbance-resist. On the basis of these, a PID controller is designed for the unwinding tension control system. Though simulation and analysis, it shows that the proposed strategy of inverse system decoupling control can achieve the decoupling unwinding control system, and the PID controller which is designed after introducing the active-damping makes the system get an ideal control effect.
The Shell Molding Process Study for Mass Production of Single-Cylinder Diesel Engine Crankshaft
Authors: Liu Jiang
Published: December 2010

Crankshaft is a key transmission part in single-cylinder diesel engine, but its mass casting production is a problem. Based on the traditional shell molding process of ductile iron castings, this study did lots of techniques optimization for the crankshaft castings of single-cylinder diesel engine. Through increasing the multi-block or a combination of chill iron at sector-plate and upper spindle neck, increasing the pressure head of blind risers and the cross section of sprue, improving the fill compaction of iron pills, and other improvements, produces qualified ductile iron crankshaft castings without or almost without the shrinkage and other casting defects.
The Analytical Method of the Construction of the Profile of the Basic Rack for Equal Conjugate Curvature
Authors: Liu Hu Ran
Published: December 2010

After an extensive research on the fundamental theory, the theoretical basis for the Logix gearing will be presented in this paper. This includes the theory for gear meshing with high degree of contact. In comparison to previous studies, the theory of this paper is more restricted going beyond third order parameters into the fourth order, the teeth profile had one order of contact higher than that of the Logix gearing. So that further improved the contact strength of tooth profile. A large category of gearings with high order of contact was presented, while the Logix gear is only one of them, or the special example in realization of my theory. In the Logix gearing, the zigzag curvature center curve of media rank does not always lay about the pitch line and does not extend along the pitch line continuously and steadily. It goes forward and returns. So that, in terms of properties of the transverse engagement, the Logix gearing has not much improvement over the traditional Novikov gearing (in which the transverse engagement is temporally). In my gearing the curvature center of media rank extend along the pitch line continuously and steadily. The transverse engagement factor is larger than that of Logix gearing.
Mechanical and Pneumatic Coupling of the Pneumatic Motor with Offset Swinging Planetary Drive of Bevel Gears
Authors: Liu Hu Ran
Published: December 2010

A new kind of pneumatic motor with offset swing planetary drive of bevel gears and the application in Capstan is presented; the researched of the calculation of the efficiency of the mechanism is made. Compeered to the former structure, new kind of structure have many advantages over that of the old structure. The pneumatic driving system in the traditional derrick car is: pneumatic motor drives a reducer, and then the reducer in turn drives a capstan. Another pneumatic driving system is: an axial piston motor and an internal cycloid pinwheel drive are applied, so that the reducer and the capstan are combined into one so that simplified the transmission system. In the third version, a pneumatic motor is applied, which can be considered as the combination of pneumatic motor with axial piston and the planetary reducer and, then drives the capstan, so that simplified the transmission system as well. The new kind of pneumatic motor with offset swing planetary drive of bevel gears, which combined the pneumatic motor, the internal planetary reducer with bevel gears, and the capstan together, is the most compact structure. It is of more advantage in the occasion when space is extremely limited. In the paper, two kind of construction of this mechanism is presented, and the analysis of the efficiency of this kind of transmission is made as well.
Investigation on the Applicability of Single-Yoke Magnetic Testing under Applied Stress
Authors: Huang Dong Yan , Han Bing , Hu Tian Li , Zhang Tao
Published: December 2010

A single-yoke magnetic probe was used to study the magnetomechanical effects under the applied stress. The stability and the reproducibility of the induced signal V were discussed. The presented measurement for magnetically open samples showed a good reproducibility via daubing magnetism Glue between the probe and the sample and establishing an offset magnetic field along applied stress direction.
Deformation Characteristics of Ultra-Fine Grained Al6061 Chip in Machining by Finite Element Method
Authors: Wu Chun Ling , Ye Bang Yan
Published: December 2010

Ultra-fine grained chips with higher hardness and strength than bulk can be produced by severe plastic deformation during orthogonal metal cutting. A finite element method was developed to characterize the distribution of stress, strain, strain rate and temperature in the deformation area at different rake angles and cutting velocities. The coefficient of friction in the tool-chip interface is approximately obtained according model of mean coefficient of friction which is based on experiments in any machining conditions. The formation mechanics of ultra-fine grained chip is discussed and effect of rake angle on microstructure of chips is highlighted. The results of experiment and modeling have shown that chip materials with ultra-fine grained and high hardness can be produced with more negative tool rake angle at some lower cutting velocity.
Study on Polarization of the Cold-Rolled Steel Strip in the Process of Electrolytic Cleaning
Authors: Gao Peng Fei , Liu Xiao Kui , Nie Chao Yin , Jia Xiao Fang , Zhao Ling Li
Published: December 2010

The electrochemical behaviors of the cold-rolled steel strip were investigated at the range of ordinary current density (10A/dm2-30A/dm2). The power consumption, which is caused by overpotential of the cold-rolled steel strip per unit area (PCOC), was used to evaluate the energy consumption which is caused by polarization effectively. The effects of electrolysis time, current density, temperature and the concentration of electrolyte on the PCOC were examined. The PCOC increased with time, but the growth rate of the PCOC decreased with time. After about 8 seconds, the increasing rate of the PCOC closed to zero. The value of the PCOC was in direct proportion to current density, and there was a significant increase when the current density is beyond 25A/dm2. Both raising temperature and increasing the concentration of electrolyte are effective ways of decreasing the PCOC.
Experimental Study on Hysteresis Nonlinearity of Piezoelectric Actuator
Authors: Ji Hua Wei , Wen Yong Qing
Published: December 2010

In recent years, piezoelectric actuator is being widely used in vibration suppression and micro positioning applications for its fast response, nanometer resolution, no backlash, no friction and bigger driving force. However, its inherent hysteresis nonlinear characteristics between the input voltage and output displacement limit its control accuracy. To optimize the performance of piezoelectric actuator, it is essential to understand the hysteresis nonlinear behavior. In this work, the hysteresis nonlinear behavior was studied by experiment; the dependence of output characteristics on voltage under different electric field conditions in piezoelectric actuator was discussed. It was found that the input method and frequency of loading voltage has a great effect on the hysteresis nonlinearity of piezoelectric actuator. At last, some different hysteresis nonlinear models were introduced.
Quantum Polarization Codes for Capacity-Achieving in Discrete Memoryless Quantum Channel
Authors: Huang Da Zu , Chen Zhi Gang , Li Xin , Guo Ying
Published: December 2010

Quantum channel combining and splitting, called quantum channel polarization, is suggested to design qubit sequences that achieve the symmetric capacity for any given discrete memoryless quantum channels. The polarized quantum channels can be well-conditioned for quantum channel codes, through which one need to send data at rate 1 by employing quantum channels with capacity near 1 and at rate 0 by employing the remaining quantum channels.
Middle – Long Electric Power Load Forecasting Based on GM(1,1) and Support Vector Machine
Authors: Jia Xi Miao , Song Guo Ping , Wang Ting , Kong Feng
Published: December 2010

Due to the variety and the randomicity of its influencing factors, the electricity demand forecasting is a difficult problem for a long time. In order to improve the forecast accuracy, the paper proposes a new load forecast model based on GM(1,1) and support vector machine. First, the GM(1,1) is used to forecast the load data in the model. And then according to factors and historical load vector, support vector machine load forecast model is established to forecast the residuals of GM(1,1) and modified the forecast results of GM(1,1). Case analysis shows that the forecast method is suitable and effective, improving prediction precision compared with GM(1,1) and support vector machine, and has better utility value in mid-log term load forecast.
Polishing Mechanism and Technology of Hard Disk Substrates by Colloidal Silica Alkaline Slurry
Authors: Wang Sheng Li , Li Zhen Xia , Yang Li Bing , Tian Yu , Mu Hui Lai
Published: December 2010

Chemical mechanical polishing (CMP) has been a widely applied process for nickel-phosphorus (Ni-P) coating hard disk substrate polishing. In this study, colloidal silica-based alkaline slurry was prepared for polishing Ni-P plated substrates and its CMP mechanism was studied with alkali slurry. Effects of the various process parameters such as polishing pressure and plate speed on hard disk substrate were investigated. The results show that the polishing pressure and plate speed have a strong influence on the material removal rate and surface roughness of the hard disk substrate. The oxidization layer formed on hard disk substrate surface after polishing. The nickel ions were bounded with amidocyanogen to form stable and soluble macromolecular amidocyanogen-complex agent, improved selectivity of convex region and concave region, enhanced the chemical reaction uniformity and the mass transfer velocity, and thus high removal rate and low surface roughness could be realized.
Entity Finite Element Simulation of Steel-Concrete Composite Cable-Stayed Bridge
Authors: Xu Yu Feng
Published: December 2010

The finite element simulation is an engineering technology developed with the development of computer technologies, which is also an important development direction of structure design and analysis in the future. With the rapid development of computer software and hardware technologies, it is a tendency to perform the exquisite FE simulation analysis for structure by high performance computer (HPC). In this paper the exquisite FE simulation analysis of global model consisted of block elements and shell elements is performed by means of HPC based on Steel-concrete composite cable-stayed bridge. Moreover, the shrinkage and creep effect in the construction and post-construction period are considered. Besides effectively guiding the design, the high accurate analysis results indicate that it is practical to perform the refined FE simulation analysis by HPC.
Experimental and Theoretical Analysis on the Load Capacity of the Membrane Structure
Authors: Zhang Ying Ying , Chen Lu , Zhang Qi Lin
Published: December 2010

In this paper, the representative local part of the membrane roof in 2010 Shanghai EXPO central axis is chosen to carry out the full-size experiment. First, the mechanical properties of PTFE coated fabrics are studied according to the biaxial stress-strain curves under five stress-ratios. The ultimate capacity of single-layer model and double-layer model are got by piling sandbags. The numerical simulations are presented to compare with the experiment data. Results show the material strength, joint strength, and tension protocols agree well with the design. The failure of two models can be considered as material failure. The ultimate capacity of double-layer model is about 1.8 times the single-layer one. The differences between experiment data and numerical simulation are large, because the constitutive relationship used in numerical calculation differs with the practice.
Investigation of Tensile Behavior of Aluminum Foam Used as Sound Insulation
Authors: Zhao Long Zhi , Zhang Xiao Lan , Li Na , Zhao Ming Juan , Zhang Jian
Published: December 2010

Aluminum foam with unique reticular structure is used as a sound shield in the railway engineering because of its superior sound absorption. The strength of the aluminum foam plays important role on the life of the shield，so the tensile behavior of the open cell aluminum foam was investigated with the finite element method based on ANSYS software in this paper. The effects of the porosity and the aperture size of the aluminum foam on the tensile behavior are obtained. The results show that the material mechanical properties exhibit a significant decrease as the porosity increases, effects of the aperture size on the mechanical properties of aluminum foam is not obvious.
Optimization of Wireless Body Area Networks Model in Clonal Selection Quantum Genetic Algorithm
Authors: Wang Huan , Guo Li Li
Published: December 2010

The Wireless Body Area Networks models is not formal with the different facilities. The adaptive choice of the models is very important for each special user. In order to improve the model, the authors optimize the model of Wireless Body Area Networks with the quantum genetic algorithm based on clonal selection. The clonal selection quantum (CSQ) has shown the results of experiment by quantum genetic algorithm and immune clonal selection, and the rate and precision of quantum evolutionary algorithm have been better. It gives encouraging data results when we use the algorithm to the function optimization of Wireless Body Area Networks Model with the introduction of simulation.
Study and Implement on Key Technologies of Ship-Welding Mobile Robot
Authors: Hua Liang , Lv Lin Lin , Gu Ju Ping , Qiang Yu Jian
Published: December 2010

The key technilogies of ship-welding mobile robot applied to ship-building in plane block production line were researched and realized. The mechanical structure design of the robot was completed. The motion-controlling system of of two-wheel differential driving mobile robot was developed. A novel precision positioning control method of welding torch using ultrasonic motors was putforward. The mechanism and control-driven system of precision positioning system for welding torch were completed. The platform of obstacle avoidance navigation system was designed and the strategies of seam tracking, trajectory and posture adjustment were preliminary studied. The methods and results put forward in the paper could act as the base of deep research on the theories and technologies of ship-welding mobile robot.
Novel High Precision Digital Curvilinear Displacement Sensor
Authors: Hua Liang , Gu Ju Ping , Qiang Yu Jian , Lv Lin Lin
Published: December 2010

This study put forward a novel high precision digital curvilinear displacement sensor.The high frequency pulses were used to represent the magnitude of curvilinear displacement based on geometry analyse. The mechanical structure design of the sensor was completed. The working principle of curvilinear displacement sensor was analyzed in detail. The hardware and software design of the interface circuit of the sensor was completed and the performance of the sensor was analyzed. Compared with the traditional curvilinear displacement sensors, the sensor proposed in this paper has features of high precision, efficiency, explicit structure, low cost, wide measuring range, no need to adjust zero and it has general application value in industry field.
A B-Tree Based Interval Consistency Control Method in DVE Systems
Authors: Zhang Wei , Zhou Hang Jun , Peng Yu Xing , Li Si Kun
Published: December 2010

The consistency problem is one of the key issues to determine system functionality and performance in DVE systems. The existing methods often cannot satisfy the requirements of order consistency and interval consistency at the same time, or impose a constraint relationship on receiver nodes which brings difficulties to optimize responsiveness. In this paper, we propose a novel interval consistency control method based on B-Tree data structure. The method can improve the overall responsiveness without compromising consistency functionality. Experimental results prove that our method can effectively improve the functionality and performance of DVE systems.
An Object-Oriented Class Library for Scanning Path Generation in SLS/SLM Process
Authors: Liu Jie , Yang Yong Qiang , Lu Jian Bin , Su Xu Bin
Published: December 2010

This paper presents an Object-Oriented class library for scanning path generation in SLS/SLM (Selective Laser Sintering/Selective Laser Melting) process. The classes in the library meet the minimal requirement for the scanning path generation. Specially, in order to take advantage of the Multiprocessor technology and save the generation time, parallel computing is considered in the class library. At last, an application was developed using the class library and an experiment is provided to verify the feasibility of the parallel computing algorithm in the library.
The Simulation of Resonance Phenomenon of Super-Heavy Vibrating Screen
Authors: Chen Shuang , Guo Nian Qin
Published: December 2010

Based on the virtual prototype model of super-heavy vibrating screen, the simulink software is used to analyse the transient resonance phenomenon of the 2YAC2460 shaker, the kinematics simulation curve is obtained, including the acceleration and displacement of the vibration.
Quadtree Partition Encoding Model Based on Weighted Information
Authors: Du Zhan Wei , Yang Yong Jian , Sun Yong Xiong , Zhang Chi Jun
Published: December 2010

In the Quadtree Partition, Images need to be encoded. IFS provides this issue a unique way. According to it, we construct the IFS model based on quadtree segmentation and find the model’s Hutchinson operator and IFS attractor. Based on the above, we re-establish WEMSDNM, during which traits of the field of business domain stand out. Comparing with the traditional algorithms by experiment, the result indicates that its performance has been improved to a certain extent.
Construction of the Optimal Milling Parameters Database for Radar Key Parts
Authors: Xu Feng , Zhu Jian Jun , Peng Dai Qiang , Zhang Xiao Jun , Zuo Dun Wen
Published: December 2010

In this paper, the study is carried out on the milling parameters optimization and cutting database development of radar key parts in electronics industry. The method is proposed in detail on parameters optimization. The material removal rate is chosen as optimization objective. The cutting constraints include machining tool power, tool life, surface quality, deformation and strength of milling cutter and the chatter stability. The genetic algorithm is selected as global optimal method. At last, it presents the solutions of cutting database based on Web, which include general structure, basic function and entity relationship data model.
A Traffic Flow Forecasting Model Based on Variable Dimension Fractal Combined with Weekly Similarity
Authors: Dong Hong Zhao , Xu Jian Jun , Ma Shuai
Published: December 2010

It’s important that the short-time traffic flow forecasting has good real-time performance and high accuracy. In order to satisfy this demand, weekly similarity is imported and an improved fractal forecast model is established. In order to improve forecast accuracy furthermore, one-rank local-region forecasting principle is referenced to determine parameters which influence weekly similarity degree. Finally, the improved fractal model based on variable dimension is employed to predict the traffic flow in Hangzhou city. The experiment result shows that the improved fractal method proposed here possesses high forecast accuracy.
Numeration Simulation of Solid-Liquid Two-Phase Flow in Centrifugal Sewerage Pump
Authors: Liu Jian Hua , Zhu Ming Yi
Published: December 2010

By Means of Fluent 6.3，the paper simulated the solid-liquid two-phase flow to a centrifugal sewerage pump，using Eulerian Mixture Model under different working condition and different particle size. The simulation draws some conclusion on distributive rules of solid particle inside impeller passage. The results for this simulation were as following: Distributive rules of solid particle inside impeller passage mainly relate to particle size. Meanwhile，the volume fraction of particles and operation condition have influence on distributive rules of solid particle. The simulated results can explain commendably that attrition took place inside pump passage when pump transported solid-liquid two-phase flow. Meanwhile，the simulated results have reference price to improve the design for pump and performance of pump.
A Roadbed Earthwork Allocation Model Based on ACO Algorithm
Authors: Miao Kun , Sun Xing , Li Liang
Published: December 2010

A new optimized highway earthwork allocation model from mass-haul diagram idea is built in this study. A mass-haul diagram is a kind of traditional manual method, but it is visualized and convenient for earthwork allocation. With it, the earth moving operations can be represented as discrete events systems, and an ant colony optimization (ACO) algorithm is developed as a system to be equipped with the model. It was shown that the model developed in this study was effective and could increase earthwork allocation efficiency. The model can compute cut and fill quantities and generate the optimal earthmoving plan automatically.
A Balanced Multiway Search Tree for Multi-Dimension Searching
Authors: Li Ai Guo , Zhang Chi , Zhang Jiu Long , Zhang Zhen Hai
Published: December 2010

A new multi-dimensional index structure called RSR-tree is proposed, which based on RS-tree. In RSR-tree, index records of a leaf node are split to ensure the sequence ordering of index records in a leaf node, which reduces the addressing cost of I/O operations effectively when reading data files. The entries of a non-leaf node are split to decreases the overlap between the brother nodes, which reduces effectively the time of reading data from data files. Experimental results on different data sets show that compared to RS-tree, RSR-tree has better comprehensive performance, in regard to tree building and querying. The querying performance is increased and extra cost is not produced.
Research on Path Planning of Mine Rescue Robots Based on Fuzzy Control
Authors: Liang Yan Hua , Cai Cheng Tao
Published: December 2010

After a coal mine disaster, especially a gas and coal dust explosion, the space-restricted and unstructured underground terrain and explosive gas require coal mine rescue robots with good obstacle-surmounting performance. This paper tackles path-planning or collision avoidance problem. The collision avoidance problem in path planning of mobile robots was inspired from fuzzy control concept. The deduction of the path-planning algorithm is followed. Fuzzy rules and fuzzy inference based on experiences is built, it constructed a reasonable and applicable control reactive rule table. The simulation results are presented to validate the approach. And it is also proved that the control arithmetic is available in both static and dynamic obstacles in coal mine environment.
The Experimental Research of the Multi-Layered Spaced Protective Structure with Stiffeners Penetrated by Projectile
Authors: Zhang Zhong Guo , Gao Bin , Liu Zhao Hui
Published: December 2010

The experimental study method of the multi-layered spaced protective structure with stiffeners, which is called structural target, is presented penetrated by projectiles in this paper. Many parameters of the terminal ballistics effects and damage model of structural target are obtained after the experiment in which experimental projectiles are used to penetrate the target with stiffeners and steel plate target vertically, offering the basic experimental phenomenon and data for the mechanism research of projectile penetrating structural target (protective structure with stiffeners). In the meantime, the effect of the stiffeners on the failure mode of the structural target and the effect of the thickness and stiffness of stiffeners in the structural target are analyzed preliminarily. This paper could be helpful in the design of the protecting structures.
A Multi-Step Reinforcement Learning Algorithm
Authors: Zhang Zhi Cong , Hu Kai Shun , Huang Hui Yu , Li Shuai , Zhao Shao Yong
Published: December 2010

Reinforcement learning (RL) is a state or action value based machine learning method which approximately solves large-scale Markov Decision Process (MDP) or Semi-Markov Decision Process (SMDP). A multi-step RL algorithm called Sarsa(,k) is proposed, which is a compromised variation of Sarsa and Sarsa(). It is equivalent to Sarsa if k is 1 and is equivalent to Sarsa() if k is infinite. Sarsa(,k) adjust its performance by setting k value. Two forms of Sarsa(,k), forward view Sarsa(,k) and backward view Sarsa(,k), are constructed and proved equivalent in off-line updating.
The Past and Future of Phyllostachys nigra in Putuo Mountains
Authors: Li Bo , Hu Wei Ping , Sun Na
Published: December 2010

This article describes the characteristics of black bamboo, the culture origins of Goddess of Mercy in Putuo Mountain and the Connection between them; reviewed the cultural history of the black bamboo in Putuo Mountain that is currently crossing the stage of from the " having bamboo" to "excellent bamboo". Based on the analysis of the plant status about black bamboo in Putuo Mountain, we put forward the strategy and method for creating “the realm of black bamboo”. To create a Haitian Buddha describes the characteristics of the plant landscape operable prospects, and this also indicates an operable prospect of bringing about the plants landscape characterized by the blue sky, the blue sea and the Buddha land.
Tooth Contact Analysis of the Double Circular Arc Tooth Spiral Bevel Gear
Authors: Zhang Rui Liang , Wang Tie , Li Hong Mei
Published: December 2010

Tooth contact analysis is an effective tool for meshing analysis of the double circular arc profile spiral bevel gear (DCAPSBG), as well as the basis for loading tooth contact analysis and finite element analysis. Applying the principle of tooth contact analysis (TCA) and the tooth profile characteristic of the DCAPSBG, this paper introduced and discussed the key contents and method of TCA computer programming for numerical simulation analysis of the transmission meshing quality of DCAPSBG. The TCA program developed in this paper, which had been verified by real examples, provided an effective approach for the design of DCAPSBG.
Research of Motor Fault Diagnosis by Detecting Dynamic Model Parameters
Authors: Long Jian Xiong
Published: December 2010

A diagnosis ellipsoid equation is put forward in order to solve motor fault on-line diagnosis. It is first to estimate the motor dynamic model parameters by the on-line least squares estimation, then to detect the parameters changes in the system model, and last to identify t the parts of the system failure occurred and factors. Through a practical example of the application to diagnose a motor fault, the motor fault can be detected according to the parameter changes of the motor model, and the failure factors can be diagnosed by using the diagnosis equation. It is proved feasible and effective.
Impact of the Foamed Aluminum-Filled Structures
Authors: Zhang Zhong Guo , Sun Yu Zhou , Gao Bin
Published: December 2010

The carrying capacity and energy absorption characteristic of foamed aluminum (or aluminum foam), fabricated by melt foaming technique, are limited due to the lower strength of aluminum. The typical anti-vibration energy absorbing structures are designed as foamed aluminum-filled or sandwich structures. The deformation and absorption characteristics of foamed aluminum-filled structures subjected to impact loadings are analyzed using experimental and numerical methods in this work. The analysis shows that the steel shell of the combinative structure subjected to dynamic loadings dominates during energy absorption. The energy absorption capacity and initial instability loading increase as impact velocity increase and as increasing shell thickness duo to the interaction between steel shell and aluminum foam. The impact mass within the range of 100kg influences weakly on peak instability loading. Since the steel shell is the dominating part of load capacity and energy absorption, the reasonable design, taking into account of foam density and shell thickness and taking full advantage of interaction between steel shell and aluminum foam, should be adopted to increase the energy absorption characteristic of foam-filled structures.
A Dynamic Sensory Quality Evaluation Model Based on Panel Data and Linguistic Information Processing
Authors: Zhang Dong Ling
Published: December 2010

The sensory quality evaluation processes are widely used for many industrial products, which is evaluated according to the knowledge acquired via human senses (such as sight, taste, touch, smell). Because the evaluation information acquired by our senses is involving uncertainty, vagueness and imprecision, and the sensory quality information of products always has the panel data characteristic, so the sensory quality evaluation and certification is a multi-feature group decision-making problem based on panel linguistic information processing. This paper presents a proposed method for the development of accredited sensory evaluation methods, and shows the application of the linguistic 2-tuple representation model and its advantages. It involved several steps: gathering of sensory information from experts; computing a collective evaluation for each feature; computing collective evaluations for each object; dynamic aggregation; sensory evaluation and quality certification with global evaluation result.