bluuebunny/crossref_metadata_2025 huggingface dataset:
Analysis of the Pressure and the Gasleak of the Piston Ring of a New Double-Rotor Engine
Authors: Li Wen Min , Pan Cun Yun , Chen Jin Zhou
Published: August 2014

This paper modeling the piston ring of a new double-rotor engine based on the analysis, use Matlab program some code and woke out the numerical solution of the model,analyze the change of the gas leakage in the condition of different gas-room volume, different opening area, different spindle rotational speed, which provide strong evidence for improving sealing of the new double-rotor engine and ameliorating sealing design.
The Automobile Tension Bar Time-Varying Reliability Sensitivity Analysis
Authors: Liu Shu Sen , Shi Bo Qiang , Zhang Wen Yu , Fu Xue Jie , Wu Yue Wei
Published: August 2014

In this paper, the design of a automobile tension bar analysis example, the use of sensitivity analysis of time-varying reliability robust optimal design tension bar design parameters for reliability sensitivity analysis shows that the reliability of the impact of the strength of the material and rod diameter is positive, and the reliability of the impact of the load and rod diameter is negative. Correct application of time-varying reliability robust optimal design of mechanical parts when variant reliability robust optimization design, design service at any time during the period were not sensitive to changes of the design parameters of the reliability of the parts, and improve the parts reliability soundness.
Research of the Design and Simulation of Ultrasonic Focusing System with Phased Array
Authors: Liu Zi Hong , Jia Jia Wen , Xiong Gang
Published: August 2014

At present, the most common way of ultrasonic focusing is concave spherical self-focusing, ultrasonic focusing on lens and phased array ultrasonic focusing. Phased array ultrasonic focusing system is made up by multiple independent transducer unit array, according to the specific way and timing, real-time control of different arrays of ultrasonic signal phase. Established the ideal point source consisting of piezoelectric transducer phased array model 4 * 4 by the use of COMSOL, and results got the phased array focused in the simulation experiments.
A Heuristic Algorithm for Solving Multi-Crane Scheduling Problem in Batch Annealing Process
Authors: Xie Xie , Kong Xiang Yu , Zheng Yong Yue , Wei Kun
Published: August 2014

This paper investigates the scheduling of the multi-crane operations in batch annealing process in an iron and steel enterprise so that the completion time of the last annealed coil (makespan) is minimized. The annealing process of each coil consists of two-stage: heating and cooling. To start heating (cooling) for each coil, a special machine named furnace (cooler) must be loaded on. Once the heating (cooling) is completed, the furnace (cooler) must be unloaded immediately without any delay by crane (job no-wait constraint). The aim of our studied problem is to schedule finite machines (furnaces and coolers) by cranes to process jobs under the consideration for avoiding collision between two adjacent cranes and satisfying job no-wait constraint. For solving the problem, we present a heuristic algorithm combining earliest job requirement and closest crane first. Through the theoretical analysis, we show the absolute performance bound of the proposed heuristic algorithm.
Cold-Formed Thin-Walled Steel Framing Residential System
Authors: Zhang Yu Hua
Published: August 2014

This paper briefly introduces the cold-formed thin-walled steel residential system, the mechanical behavior analysis on stress of cold-formed thin-walled steel structure residential vertical load and horizontal load, and through compared with cold-formed thin-walled steel structure residential and traditional residential structure, summarized the characteristics of cold-formed steel residential. It is significant that the cold-formed steel residential system will be promoted and applied.
Vibration Modal Analysis of the Full-Sized Medium Density Fiberboard
Authors: Guan Cheng , Zhou Lu Jing , Zhang Hou Jiang , Li Kang Hua
Published: August 2014

To determine modulus of elasticity (MOE) of the whole full-sized medium density fiberboard (MDF) by using vibration method in the future, this paper studies MDF vibration characteristics. To solve modal parameters of full-sized MDF in the condition of free vibration, the writers conducted calculation modal analysis and experimental modal analysis of the full-sized MDF with three different thicknesses respectively, compared and analyzed the first three order modal shapes and frequencies. It is found that the full-sized MDF with three different thicknesses showed the same vibration modal forms: the first and second vibration modes had bending vibration along the length direction, while the third one had bending vibration along the width direction; the frequency obtained through calculation modal analysis and experimental modal analysis had a certain difference—the first calculation modal frequency was slightly lower than the first experimental modal frequency, and the second and third calculation modal frequencies higher than the corresponding experimental modal frequencies. However, there is a good correlation between calculation modal frequency and test experimental modal frequency with the determination coefficient reaching 0.9816.
Designing and Simulating a Mechatronic Inerter
Authors: Li Di , Liu Yao Zong
Published: August 2014

Inerters are two-terminal mechanical devices, which can simulate masses. It is significant to increase the ratio of the inerters’ inertance to its mass for mechanical networks synthesis. In order to increase this ratio, this paper proposes a novel mechatronic inerter which adds its own inertance by utilizing the electromagnetic torque of DC motor. An external electrical circuit of the mechatronic inerter is designed to ensure the additional inertance. The model of the mechatronic inerter is built and simulated. The results show that, under the same moment of inertia, the inertance of the mechatronic inerter is far greater than that of the mechanical inerter.
Analysis of Vibration Characteristics of a Cracked Rotor
Authors: Chu Xin Xing , Wang Feng Lan
Published: August 2014

This paper studies the Jeffcott cracked rotor based on level set, considering the oil film oscillation effects on crack rotor, building the stiffness matrix of the cracked rotor in the fixed coordinate system and the moving coordinate, deriving the nonlinear differential equations of coupled vibration of a cracked rotor, and analysis of its dynamic characteristic combined with case. Analysis shows that: crack rotor can produce nonlinear vibration in the crack and Oil film oscillation can be coupled bending and torsional vibration of cracked rotor. The analysis results provides practical basis for diagnosing Resonance of the rotor system fault and the safe operation of rotor.
CFD Simulation and Study of Air Pump Loss on Two Kinds of Retarders with Different Turbulent Structures
Authors: Song Zhen Chuan , Li Hui Yuan , Wu Chao
Published: August 2014

Bench test and computational fluid dynamics (CFD ) simulation of the air pump loss on the 380 hydraulic retarder are completed in this paper . It turns out that the CFD simulation has nice reliability from the contrast of the air pump loss between the test and the simulation . And on this foundation , CFD simulation of two kinds of retarders with different turbulent structures is done . The contrast of the results of the simulation give the effects of different turbulent structures on cutting down the are pump loss .
Study on Random Response Analysis for the Isolation Cylinder Clamp
Authors: Sun De Lin , Du Zhong Lei , Hou Shi Yuan , Liao Ri Dong
Published: August 2014

For the fracture failure phenomena occurred in random vibration experiment of the isolation clamp cylinder on the aerospace vehicles, the NX NASTRAN was used to make the finite element modeling for the overall structure of cylinder and analyze the random vibration response. The simulation results show that the maximum RMS stress of the clamp was 96 MPa at the test load conditions. The position of the maximum RMS stress is consistent with the one where fracture happens during vibration test. According to finite element analysis results, the original structure has been modified. The maximum RMS stress of modified structure is only 21.8 MPa.
Analysis, Design and Simulation of Transmission System in a Mini Vehicle Weapon System (Unmanned Ground Vehicle)
Authors: Berrah Walid , Li Dong Guang
Published: August 2014

Operation of the gun/turret system in a military tank is limited by several constraints some of which are posed by obstacles existing on the vehicle's own platform. In this study we tried to eliminate some of these constraints by the design and adaptation of transmission system between the chassis of the vehicle and the upper structure. The proposed approach is to adapt a motion platform on the top of the chassis of the vehicle. The motion platform chosen is a 3RPS parallel robot will achieve persistent control by allowing the upper structure of the vehicle to always back to the horizontal position and stay in a level position, in spate of the displacements and vibrations on the vehicle. The design of the chassis of the vehicle and the parallel platform is made using SolidWorks Computer Aided Design software. After that according to structural characteristics of the 3-RPS parallel robot, the mathematical model of the posture inverse kinematics is established. Based on Matlab software, SimMechanics, the simulation model of this robot is established. The validity of the inverse kinematics is proved by comparing the two models. And during the simulation, the related kinetics data and motion animate are obtained. Finally the simulation comparison after setting the parameters of the PID controller is established too, the animation shows that the control effect is obvious where the moving platform follows the desired trajectory.
The Research and Practice of Product Design in a Guilding Robot
Authors: Long Ren , Cao Huai , Li Jun
Published: August 2014

Through taking the appearance design of Guiding Robot Xiaomai which is used for the 60th anniversary of HUST as example and summarizing the result and experience in course teaching, this article mainly discusses the importance of project teaching in the teaching link of Product Design. The result shows Project teaching is a way of student-centered learning with multi-disciplines, collaborative learning, self-exploration and living practice [1]. It enables students to learn knowledge more targeted and systematically. And it greatly improves students’ ability of overall planning, hand-making, communication and teamwork spirit, which produces teaching effect that is far superior to the traditional teaching.
Automatic Tuning Arc Suppression Coil Current in a Small Grounding System
Authors: Zhang Hui Lin , Zhao Yu Bo , Liu Feng Zhen
Published: August 2014

Equipped Petersen coil systems can compensate for the capacitance of the line current, the single-phase ground fault current flows through the capacitor grounding point for the minimum point of the arc of a reliable ground fault arc , to avoid reigniting , prevent arcing ground fault point phase faults caused by short circuit . But will also prevent the neutral point displacement due to different switching operation of single-phase disconnection caused by other factors , to avoid the neutral point voltage is too high, the threat of insulation safety equipment . In addition Petersen coil in the normal operation of the power grid , and can effectively prevent resonance over-voltage , prevent equipment damage caused thereby , better protection of system security , stability, and high-quality operation. Automatic tuning arc suppression coil can meet the common good basis to eliminate the role of the Petersen coil grid resonance occurs , install and use the effect is significant.
Failure Analysis of Single-Lap Single-Bolt Composite Joints with Countersunk Fasteners
Authors: Xin An , Zhao Li Bin
Published: August 2014

A failure analysis of a single-lap single-bolt composite joint with a countersunk fastener was carried out using a progressive damage model. The FE model considering the distributions of fine and coarse meshes, appropriate contact pairs and the bolt preload was established. Based on the analysis, the five stages in the load-displacement curve and the changes of tilt angle were discussed in detail as well as failure contours of hole laminates at typical events during the damage propagation are illustrated. The inherent development tendency of the tilt angle accompanying with the damage propagation in the single-lap joint vividly depict its failure process.
The Spiral Space Form of Exhibition Buildings Based on Topology and Bionics
Authors: Li Chun Fu , Huang Jing Jing , Shi Hui Ting , Chen Lu Ying
Published: August 2014

The continuity characteristics of spiral space is extremely suitable for function of exhibition buildings. Under the background of rapid development of technology and information, the forms of spiral spaces are becoming more sophisticated and creative. In this paper, we introduce the concept of “topology” and set the latest and most classic cases of spiral space form in Exhibition building, and make a meta-analysis of the idea of spiral space of exhibition buildings in two ways which are geometric topology and natural bionic, and aiming to study the homogeneity feature of the form.
Portable Fire Water Branch Stents Structure Design and Kinematical Simulation
Authors: Wang Shao Wei , Qin Hai Yin , Wei Wei
Published: August 2014

Contrapose the disadvantages of the traditional fire water branch stents, the paper developed a simple structure, safe and reliable, low labor intensity, and can adapt to the complex fire environment of portable fire water branch stents.This paper introduces the structure and working principle of fire water branch stents, and simulates analysis of the motion trajectory of fire water branch through the Pro/E and ADAMS.The results show that the portable fire water branch stents safe and reliable, can meet the demand of fire control.
On Surface Continuity in the Procession of Product Design
Authors: Cai Yan , Li Liang Zhi
Published: August 2014

The purpose of this paper was to verify the way in which CAD systems and their tools for visual surfaces analysis interact with morphological knowledge in the determination of continuity in product design procession. Geometrical knowledge is necessary but not enough for working with this attribute of form in everyday objects, where cultural factors are involved. Geometry establishes a progressive range of surface continuity that involves the concepts of position, tangency and curvature. In product design different degrees of continuity that not necessarily follow this idea of increment. What is understood as discontinuous in products in most cases is geometrically continuous.
Analysis of Surge Shaft Excavation Process Based on 3-Dimensional Finite Difference Method
Authors: Shen Zhen Zhong , Wang Ning , Yao Nan , Shao Chao Xin
Published: August 2014

As an important part of the structure of hydroelectric power station, surge shaft is embedded in the rock mass, whose body size and loading conditions are typically complex. Thus, it is necessary to evaluate safety of the design scheme in order to ensure construction safety. With upper background, three dimensional finite difference model of the surge shaft and surrounding rock of a hydroelectric project in Zambia were established based on three dimensional nonlinear finite difference analysis method. Calculation of the surge shaft stepped excavation with supporting at all levels of the construction process was done. The deformation and stress state of the surrounding rock of surge shaft and its variation law in excavation process was analyzed. Furthermore, the stability of surrounding rocks and rationality of the designed support measures were evaluated.
CC Path Generation Method Based on Cutting Shape of Flat-End Cutter
Authors: Li Hui Ying , Chen Liang Ji
Published: August 2014

The calculating algorithm for Cutter Contacting (CC) paths is proposed in this article to enhance machining precision of complex surfaces with a flat-end cutter. With the style of coordinate transformation, effective cutting shape and equavellent machining radius of a flat-end cutter had been calculated and deduced, and the step-over distance formed by two adjacent CC paths were also obtained. The corresponding NURBS path of tool center points including knot vector and controlling points was obtained from the cutter contacting points.The parameter increment along the CC path interval direction was calculated by using geometric analysis of the local area of CC point.
Conception of Scheduling and Planning in Reconfigurable Work Stations on the Base of IEC 61499 Function Blocks
Authors: Stambolov Grigor , Petkova Petya
Published: August 2014

One of the latest solutions in automated production systems is developing of Reconfigurable Manufacturing Systems (RMSs), which have an open structure that allows the integration of new technologies and modifying manufacturing for a new type of production based on adding, removing or updating the elements and units in the hardware and software level. To realize the automated processing RMS needs to have decentralized architecture, including hardware (module based) and software reconfiguration, which to enable distributed control, monitoring and diagnostics in real time and dynamic planning processes and resources in the system. One of the ways to realize this architecture is to development RMS control system on the base of IEC 61499 function blocks (FBs). Important part of the control system is a module for distributed planning and scheduling of processes, which consists all available information for technology of the products. This paper presents an approach for development of scheduling and planning modules in reconfiguration cutting work station on the base of IEC 61499 function blocks.
Sand as a Heat Storage Media for a Solar Application: Simulation Results
Authors: Mahfoudi Nadjiba , Moummi Abdelhafid , Ganaoui Mohammed El
Published: August 2014

This paper deals with the numerical investigation of transient behavior and thermal storage capability of a sensible heat storage unit. The former has a cubic configuration with embedded charging tubes; it is used to store solar energy with sand as a storage media. The system operates in the range of low temperature. To analyze their heat storage characteristics (including the bed temperature, energy stored rate, charging energy efficiency), a finite element based 2-D mathematical model has been developed using COMSOL Multiphysics. The results show that sand has an important thermal inertia. However, it was interesting to develop these storage systems in the region where both sand and solar energy were plentiful.
Electric Field Calculation of Pipe with Cathodic Protection in Seawater by BEM
Authors: Tan Jian Hong , Wang Shi Qin , Zhang Sheng Tao , Xiang Bin , Zhang Guo Qing
Published: August 2014

To investigate the corrosion state of subsea pipeline under cathodic protection, the surface potential distribution of the pipeline has to be measured exactly, but it’s very difficult to measure directly in actually. On base of boundary element methods (BEM), a 2D model about pipe’s cathodic protection under sea water was established, and then software to calculate the electric field distribution on pipe surface in even media (seawater) was developed by way of Matlab. The developed software was verified through an experiment in lab. The result shows that numerical calculation based on BEM by Matlab is feasible for cathodic protection electric field of pipe in marine environment.
Peer-Comparison Based Fault Diagnosis for Hadoop Systems
Authors: Tang Yue Gao , Miao Li , Chen Feng Ping
Published: August 2014

In the age of big data, MapReduce is developed as an important tool to process massive datasets in a parallel way on cluster and Hadoop is an open-source implementation of it. However, with the increasing size of clusters, it becomes more and more difficult to identify and diagnose faulty nodes, especially those continuing running but with degraded performance. Then, based on an observation that the behaviors of all nodes in the cluster are relatively similar, we propose a peer-comparison approach that can automatically diagnose performance problems in Hadoop cluster through extracting, analyzing both Hadoop logs and OS-level performance metrics on each node. Compared with previous works, our approach is more scalable and effective and can pinpoint the underlying bug of faulty node in Hadoop clusters.
Hygric Transport Parameters of Several Kinds of Sandstones
Authors: Koňáková Dana , Čáchová Monika , Keppert Martin , Vejmelková Eva , Černý Robert
Published: August 2014

Hygric transport properties belong to a group of important characteristics from a construction design point of view. Since a content of water (at whatever state) could lead to degradation processes of materials whether by phase changes or by chemical reaction (with any component of water contained), it is important to know an amount of water which can get into the pore structure of a material. Studied materials in this workwere sandstones. Several types of these clastic sedimentary rocks were chosen and experimental determinations of basic physical properties as well as hygric transport parameters were performed. From the achieved results,it is obvious that the main influence on hygric transport characteristics has the open porosity, in particular the pore structure.The higher porosity is the higher amount of water can be transported through the sandstones.
Tunnel Structure Safety Monitoring System Based on BOTDA Technology
Authors: Li Xiao Juan , He Fan , Wang Yu Bo , Zhang Bin , Liang Xiao Bin
Published: August 2014

The structure of the power tunnel is unique as a special place. It is built under the surface of the earth crust,belongs to half-hidden project. In recent years, affected by operating life, geological conditions, design and construction, the number of the tunnels which has structural safety risks apears more and more, so the safety of the tunnel structure always has been a very important issue of construction, operation and maintenance. This paper presents a tunnel structure safety monitoring system based on BOTDA technology.This system has good adaptability to the scene, and can remotely monitor the structural safety of the tunnel in real time, and it also has advantages of distribution, long-distance, high-precision, etc.
Characterization of Electrospinning Polycarbosilane Fiber with the Concentration of N,N-Dimethylformamide 22%, 24%, 26%, 28% and 30%
Authors: Setiawan Jan , Fatimah S. , Poertadji Suhardjo , Sigit  , Sudjadi U.
Published: August 2014

Polycarbosilane (PCS) fibers have been made using a solvent which is a mixture of N,N-dimethylformamide (DMF) in toluene. Polycarbosilanes (PCS) obtained from NaBond with concentration 1.2 g/ml dissolved in solution toluene and N,N-dimethylformamide (DMF) was stirred gently for 24 h at ambient temperature. DMF was mixed with toluene at ratios 22%, 24%, 26%, 28% and 30%. Electrospinning apparatus (nanoE-Spinning) from NaBond was used. In a vertical electrospinning set up, the solution in a glass syringe delivered to the tip of a 6-gauge (0.5 mm inner diameter) stainless steel needle. The tip to collector distance was adjusted to 100 mm with applied high voltage at 10kV. A stainless steel plate with dimension 100 mm x 100 mm wrapped by aluminum foil was used as collector. The electrospinning non-woven fiber was cured at temperature 200°C (2°C/min), for 1h, 1.5h, and 2h, and fibers with DMF concentration 30% was also pyrolysis at 1000 °C for 3 h in inert atmosphere. The samples were tested and observed with FTIR spectroscopy, and SEM-EDS apparatus. The results showed that PCS fibers can be made from dissolving PCS with toluene with the addition of DMF to increase the polarity of the solvent and the formation of fibers is done by using electrospinning which is supported by the presence of voltage from the outside. Fiber curing is done at 200 °C to evaporate the toluene, the DMF, and resulting stronger fibers than before. The addition concentration of DMF in toluene and curing time will affect the composition of the resulting PCS fiber. Curing time on PCS fibers will affect the composition of solvents such as DMF and Si-H bond on which to assert their PCS fiber cross linking conditions. PCS fiber morphology is known of changes in fiber diameter and fiber uniformity. Smallest PCS fiber average diameter 4.81 μm resulted from 28% DMF with curing time 2 hours and the largest achieved from 22% DMF with curing time 1 hour around 14.22 μm. Composition of pyrolyzed fiber was SiO0.587C0.413, with average density 3.1033 g/cc and average diameter the fiber was 3.06 μm.
Nucleation Laws of Supercooled Austenite Transformation
Authors: Ji Yun Ping , Liu Zong Chang , Qiao Jie , Ren Hui Ping
Published: August 2014

It is significant theoretically to study the nucleation laws of the phase transformation products of the supercooled austenite. The different iron and steel materials were used to study the nucleation of pearlite, bainite and martensite by QUANTA-400 environmental scanning electron microscope and JEM-2100 transmission electron microscope. The results show that, from the high-temperature zone to the low-temperature zone, the nucleation of the transformation products of the supercooled austenite is a gradually evolutionary process from two-phase nucleation to single-phase nucleation. Pearlite nucleates in the austenitic grain boundary, bainite nucleates preferentially in the grain boundary and sometimes in the grain interior and martensite nucleates preferentially in the interface and generally in the grain interior. The preferential nucleation sites are the interface, and with the decrease of the transformation temperature, they gradually shift to the defects in the grain interiors, which accord with the general rules of the phase transformation nucleation.
Tunable DUV Locolized Plasmonic Absorption by Al Metallic Nanoparticles Arrays
Authors: Wang Chun Zi , Huang Kai , Gao Na , Wu Zhi Ming , Kang Jun Yong
Published: August 2014

We dominated localized surface plasmon resonance (LSPR) of aluminum (Al) by controlling their size and density. We report the implementation of Al nanoparticles (NPs) fabricated on the surface of the Ta2O5layer on glass for localized surface plasmon resonances (LSPRs) coupling. The size, density controllable small Al NPs were fabricated using oblique angle deposition method. The optical properties of the NPs array were studied by UV spectrophotometer and finite-difference time-domain (FDTD) simulations. We found that the LSP resonance wavelength of different sizes of Al NPs array exists a blue shift in the extinction spectrum as the particle size decreases.
The Formation of Nanostructured Surface Layers of a Material with Shape Memory Effect of the TiNi Deposition Melt of the Fusible Metal at a Temperature Gradient
Authors: Blednova Zh.M. , Rusinov Peter Olegovich , Jurkova Anna Pavlovna
Published: August 2014

The results of experimental studies on the formation of the surface layers of a material with shape memory effect (SME) based on TiNi deposition of Pb-Bi melt at a temperature gradient of 600-1100 °C in an argon atmosphere. It is shown that this method allows to obtain uniform surface layers in nanostructured state and almost any thickness can be used for the formation of coatings on the interior surfaces of products of any shape with the stress concentrators. Structure, chemical and phase composition of the surface layers provide a manifestation of TiNi shape memory. The average grain size of TiNi coatings ranges between 60 ÷ 160 nm.
Microemulsion Improvement Method Preparation of ZnS and Luminous Performance Research
Authors: Yao Ning , Wang Zhi Long , Liang Yan
Published: August 2014

Series samples ZnS and ZnS: Cu2+(0.001<x<0.05) have been prepared by a simple and template-free microemulsion improvement method. From the XRD we know that all samples are single phase. The SEM photo shows that the particle sizes are about 20nm~50nm.When the contents of doping Cu2+ ions increasing, the particle sizes become larger, which proves that Cu2+ ions occupy the position of Zn2+ ions. The emission spectrum (ES) indicates that when doping Cu2+ ions ,samples show a blue light and the main emission peaks which caused by Cu2+ ions t2 transition locates at 425nm.
Deformation Characteristic Analysis on Air Bending in JCO Forming of Large Diameter Welding Pipe
Authors: Fan Li Feng , Gao Ying , Yan Jia Xin , Yun Jian Bin
Published: August 2014

JCO forming is one of manufacture mode widely used in production of large diameter submerged-arc welding pipes, in which JCO forming process is progressive multi-step air bending. In order to improve JCO forming quality, it is necessary to analysis deformation characteristic of air bending. So, air bending is analyzed using finite element method. Taking the air bending of X80 steel Φ1219mm×22mm×12000mm welding pipe for instance, the air bending is simulated by finite element (FE) code ABAQUS. In this paper, the simulation data is validated by experiments and a comparison showed a good agreement with experiments results. The stress/strain from simulation is discussed. Thus, the results of research provides a basis to improve JCO forming quality.
Finite Element Technique for Predicting Stress Distribution in Milling TC4 Titanium Alloy
Authors: Li Bin , Zhao Shu Ling
Published: August 2014

Cutting forces modeling is the basis to understand, simulate milling process and further to control milling process parameters for obtaining higher precision workpieces. With the development of engineering technology, FEM can be used to simulate metal machining process and gain better understanding of material flow within dies, so as to optimize tooling to eliminate tears, laps and other forging defects. In this paper, the calculated cutting force increases approximately logarithmically with the cutting speed, as should be expected from the logarithmic rate dependence.
Deformation Characteristic Analysis on Mechanical Expanding of Large Diameter Welding Pipe
Authors: Fan Li Feng , Gao Ying , Yan Jia Xin , Yun Jian Bin
Published: August 2014

Mechanical expanding is widely used in production of large diameter submerged-arc welding pipes. To improve welded pipe quality, it is necessary to analysis deformation characteristic of mechanical expanding forming process. So, mechanical expanding is analyzed using finite element method..
Taking the expanding of X80 steel Φ1219mm×22mm×12000mm welding pipe for instance, the mechanical expanding forming process is simulated by finite element (FE) code ABAQUS. In this paper, the simulation data is validated by experiments and a comparison showed a good agreement with experiments results. The deformation characteristic of mechanical expanding is discussed. Thus, the result of research provides a basis to improve welded pipe quality.
Effects of Mould on Crimping of Large Diameter Welding Pipe
Authors: Yan Jia Xin , Yun Jian Bin , Fan Li Feng
Published: August 2014

Crimping is widely used in production of large diameter submerged-arc welding pipes. In crimping process, mould is one of the main factors which influences the quality of forming and should be considered at the stage of designing the forming die and process. So, Effects of mould on crimping is researched using finite element method.
Taking the crimping of X80 steel Φ1219mm×22mm×12000mm welding pipe for instance, the crimping forming process is simulated by finite element (FE) code ABAQUS. In this paper, the simulation data is validated by product and a comparison showed a good agreement with product results. The stress/strain from simulation is discussed. Thus, the results of research provides a basis to choose mould.
Mean Shift-Based Target Tracking for Moving Spherical Object in Video
Authors: Li Bo Zhao
Published: August 2014

When researching on target tracking in the on or off line video, using a variety of methods such as MeanShift, Camshaft’s, feature points and optical flow algorithm. MeanShift target tracking algorithm is introduced in this paper. Firstly, tracking object is selected by human-computer interaction. Then color feature histogram is obtained using RGB color information, and color distribution probability image is got by converting color feature histogram. Finally, by comparing the probability difference of color distribution of the adjacent frames, motion directions of the object’s center are obtained, which object can be effectively tracked.
Simulation Study on Single-Phase Parallel Type of APF Double Loop Control Technique
Authors: Zhang Sui , Su Wei , Qiao Yu Ku , Wang Dong Dong , Luo Ji
Published: August 2014

This paper begins with analyzing the hazard of system harmonics and proposing the effectiveness of active power filter (APF) in harmonic wave inhibition. Against the background of single-phase parallel type of APF, its working principle is introduced and its mathematical model is built. Next, analyzed in details is the single-phase parallel type of APF double loop control system based on outer voltage loop and inner current loop, with the specific design procedure of PI control parameters of outer voltage loop and inner current loop presented. Finally, through MATLAB simulation, the designed system control parameters undergo verification. The simulation result indicates such single-phase parallel type of APF based on the double loop PI controller with outer voltage loop and inner current loop can ensure stability of the DC bus voltage and make effective compensation for harmonics over the mid-and low-frequency bands.
The Construction and Practice of Private College Campus Portal System
Authors: Feng Tao
Published: August 2014

Nowadays, lots of college campus portal systems have many problems, such as teachers and students do not want to use the systems. This paper, which analyzes the advantages and disadvantages of two kinds of portal systems, and it also insight the demands of teachers and students, is in order to construct a portal system which applies to the private colleges with combining the Portal system and the CCS system. Hoping the portal system’s construction plan can have a certain reference value for the other universities and colleges who are going to construct campus portal system.
“Public Relations” Course Design and Implement Based on Google Cloud
Authors: Yu Ling
Published: August 2014

This paper introduces the IT environment of cloud computing, and how cloud computing service for teaching, " Public Relations " course , for example, the use of Google's cloud computing services builds courses platform, offers a set of comprehensive , actionable curriculum design. The program, for the course network platform design, project settings, and classroom activities designed Showcase and peer assessment, curriculum resources, and learning evaluation, etc. makes concrete workable plan.
Study on Cognitive Dissonance of Passive Safety Investment Based on Cultural Psychology
Authors: Hong Yu Feng , Song Huan Bing
Published: August 2014

In order to explore the deep internal cause of frequent occurrence of coal mine disasters in new era, firstly the paper has studied current situation of “institutional walls, equipment idle” in Chinese township coals by behavioral economics. And then, we analyzed cognitive dissonance of speculative psychology by cultural psychology in the course of passive safety investment. The results show that just relying on the infinite increase of rewards and punishments regulation system cannot effectively make them take active safety investment in the new period of economic development. Our study highlights the importance of mutual construction of psychological and social cultural in the preventing coal mine disaster.
Modal Analysis for the Fuselage of the New Tube Automatically Benchmarked Equipment Based on ANSYS Workbench
Authors: Chen Fu Yang , Wu Yan , He Yu An
Published: August 2014

The 3D solid model of the tube automatically benchmarked equipment is built by UG software. With seamless connectivity UG and ANSYS Workbench software, modal analysis of the fuselage of the automatically benchmarked equipment built by ANSYS Workbench software. Then natural frequencies and modal of the lower six orders are obtained, and the vibration weakness of the structure has also been found out. To improve the structure provides a reliable reference
Characteristics Analysis of Tire Hydroplaning Flow and Tread Design Influence Study
Authors: Yang Jian , Wang Guo Lin , Zhou Hai Chao
Published: August 2014

Tire hydroplaning has become a direct inducement of wet-weather road accidents. The model of hydroplaning of the deformed rib tire with load was built with the help of CFD (Computational Fluid Dynamics) technology. The three-dimensional SST coupled with the Volume of Fluid (VOF) model was applied to numerically simulate the air-water two phase flow with free surface in tire hydroplaning. Based on the model of hydroplaning, the design of tire pattern rib and lateral grooves on tire hydroplaning were analyzed. Analysis shows that tire has a high pressure induced by water impact in the front of footprint; water flow is inclined to tire sidewall. For the rib grooves, the depth of rib groove has a largest effect, followed by the rib groove width, finally the distance between the two rib grooves; for the lateral grooves, the structure factors sequence is :lateral grooves number> width> angle.
Study on Finite Element Analysis of the Rolled-Steel Pallet Based on Ansys
Authors: Fang Zhe , Han Mei , Li Yu Yi
Published: August 2014

In the article, the study focus on the computer aid finite element analysis of the rolled-steel pallet. The value of various parameters is determined by the force analysis according to the relevant standard in working condition of shock. Meshing the modal and defining the force and constraint are discussed before the simulation. The calculated value based on Ansys is very similar to the result in the actual situation, which proved that the computer aid analysis can be used in the rolled-steel pallet detection in order to decrease the cost and increase the accuracy.
Failure Mode Analysis for High-Speed Motorized Spindle of NC Machine Tools
Authors: He Yu An , He Yan Ming
Published: August 2014

High-speed motorized spindle of NC machine tools is the core component for high speed machining. Production efficiency, machining accuracy, processing quality are greatly improved, and production cost is reduced by high speed machining. The paper describes the common failure modes of high-speed motorized spindle. By the fault tree analysis method, failure modes of motorized spindle are modeled, and the main fault reasons of motorized spindle for NC machine tools are gotten. Qualitative analysis is performed for the fault tree by the mean of the structure function. At the end of this paper, the minimal cut sets which are the main sets of failure modes are all obtained. It has laid a good foundation for further study of quantitative analysis of motorized spindle failure modes.
Asymptotically Self-Similar Solution for the Convection-Diffusion Equation
Authors: Yu Xue , Zhang Qiu Sheng
Published: August 2014

We study the Cauchy problem for the convection-diffusion equation, which describes physical phenomena where particles, energy, or other physical quantities are transferred inside a physical system due to diffusion and convection processes. For, we show the continuous dependence upon the initial data. Moreover, asymptotically self–similar global solutions are investigated with nonhomogeneous initial date.
Evaluation of Interface Performance by Means of Dynamic Electrochemical Impedance Spectroscopy
Authors: Lv Ya Ling , Zhang Sheng Han , Tan Yu
Published: August 2014

Interface performance investigations of turbine rotor alloy (30Cr2MoV) in 0.01M Na2MoO4have been performed by means of Electrochemical Impedance Spectroscopy (EIS) under step potential change conditions. A general equivalent circuit was employed to analysis the polarization behavior of that turbine rotor. It has been shown that EIS measurements under potentiodynamic conditions allow simultaneous investigation of changes in interface structure, ions transport process through the interface and electrode process kinetics on interface. The result verified the adsorption principle on metal passivation.
Performance Study Analysis of Inflaming Retarding Viscose of Clothing Material
Authors: Chen Yu Gang
Published: August 2014

This paper makes test of degree of polymerization and molecular weight of common and inflaming retarding viscose in clothing material. And then it analyzes the effect of degree of polymerization and molecular weight on material fiber thermology and mechanical property. The research shows that the addition of fire retardant reduces degree of polymerization and molecular weight of material fiber, enhances flame retardant performance, and reduces mechanical property. Through the test research, we deeply compare the performance of inflaming retarding and common viscose on clothing material, which offers related reference value for the development of inflaming retarding function garment materials.
Investigation of the Corrosion Mechanism of A3 Steel by Ammonia Nitrogen Metabolites of Crassostrea Rivularis
Authors: Cai Cheng Xiang , Yin Yan Zhen , Li Jia Ming , Zhong Shu Ming , Wu Xiu Feng , Nong Yao Song
Published: August 2014

Using ammonium chloride (NH4Cl) as model compounds of ammonia nitrogen metabolites of crassostrea rivularis (oyster), the corrosion process of steel alloys by ammonia nitrogen metabolites of oyster was carried out in simulated seawater. Using A3 steel for marine engineering steel as the sample, the experiments based on the corrosion coupon in natural sea, static coupon, scanning electron microscope and polarization curve were carried out. According to the corrosion morphology development of samples, the corrosion mechanism of attached corrosion of was revealed.
Exchange Bias of the Fe/Fe3O4 Coated Ag/Hollow Glass Microspheres
Authors: Li Ang , Wang Tian Hui , Wang Dan , Bi Jian Guo
Published: August 2014

This paper presents an investigation of the exchange bias of the Fe/Fe3O4 layer deposited on the Ag/hollow glass microspheres. The results show that exchange bias is affected by different thickness of Fe3O4 layer which is caused by different reaction time. The exchange bias field (HE) increases gradually with increasing reaction time, and achieves maximum value when the reaction time reaches 30min; after that, it decreases. It is also found that the changes of exchange bias field (HE) are proposed to the frozen interfacial spins and the structural lattice disorder
Electrical and Magnetic Properties of Multiferroic BiFeO3 Ceramics Prepared Using Sol-Gel Derived Fine Powders
Authors: Chen Fang , Qi Ya Jun
Published: August 2014

Insulating BiFeO3ceramics with a small amount of secondary phase Bi2Fe4O9were prepared by rapid sintering at 840 °C using sol-gel derived fine powders. The ceramics are dense and consist of grains of 3∼8μm in size. Their leakage current density remains lower than 5.5×10−5A/cm2under the applied electrical field below 100 kV/cm. The main conduction mechanism from 50−190 kV/cm is space-charge-limited-current relating to oxygen vacancies. The ceramics exhibit a saturated ferroelectric hysteresis loop with a remanent polarization (2Pr= 22μC/cm2) under the applied field of 165 kV/cm. Weak ferromagnetism was observed with a remanent magnetization 2Mrof 1.2×10−4μB/Fe at 300 K and of 1.8×10−4μB/Fe at 10 K.
Kinematic Optimization of Transplanting Mechanism with B-Spline Curve Gear for Rice Pot Seedling Based on Matlab
Authors: Zuo Yan Jun , Yu Xiao Xu , Li Wen Ge , Zhu Hui Xuan , Ji Hai Peng
Published: August 2014

In order to realize the mechanized transplanting of rice pot seedling and ensure our food security, The pitch curve of non-circular gear is fitted based on cubic, non-uniform and rational B-spline curve. The planetary gear train transplanting mechanism has been invented for ride type, and kinematics mathematical model has been built through the kinematics analysis of transplanting mechanism. The computer aided analytical and optimized software has been developed by using software platform of Matlab. Through tuning the data points by man-machine interaction, pitch curve of non-circular gear is optimized and structural parameters are obtained, which can meet the demand of track and attitude in the transplanting process for rice pot seedling. In condition of the parameters, the correctness of the established model is verified by the virtual experiment by software of Adams.
Research on the Anti-Penetration Performance of Aluminum Foam Sandwich Plate
Authors: Hang Gui Yun , Yu Wen Li , Wang Tao , Wang Jin Tao , Li Zhen
Published: August 2014

This paper investigated the anti-penetration performance of different sandwich structures plate using numerical simulation method. Finite elements models of the bullet and sandwich plate were established. The penetration performance of sandwich plate by bullet was simulated by software of LS-DYNA and dynamic response of the bullet during the penetration process was got. The results show that the anti-penetration performance is different because of the different cores in the plate. Besides, the density of the aluminum foam core has a direct effect on the performance. This paper could provide some reference for the designing of sandwich structures.
Eulerian Description of Rail Straightening Process
Authors: Návrat Tomas , Petruška Jindrich
Published: August 2014

The paper deals with numerical analysis of the process of roller straightening of rails. The problem of repeated elasto-plastic bending is solved by a program in MATLAB based on FEM algorithm with Eulerian description of material flow through the straightening machine. Beam element formulation with a shear deformation effect is used for the rail discretization. The results are compared with literature and standard FE analysis with Lagrangian description of material flow. Effectiveness of presented formulation is discussed and its applicability for fast iterative optimization of the straightening process is illustrated.
Aerodynamic Characteristic Analysis of Two-Dimensional Trajectory Corrector Projectile in Mortar
Authors: Zhang Tong , Zhao Xiao Li , Song Zhen Dong
Published: August 2014

Aiming at researching aerodynamic characteristic of projectiles. This paper builds three simulation models with fins in different amount and appearance, by using CFD software to generate meshes of each model, it simulates the changing laws of drag coefficient, lift coefficient and pitching moment coefficient and analyses correct ability and flight stability of each model according to the data, simulation results indicate that projectile with folded fins have better aerodynamic appearance and can be studied deeper, it provides aerodynamic reference for future research.
Multiaxial Fatigue Life Prediction of the CII Platform Leg Based on Critical Plane Energy Method
Authors: Lu Jian Hui , Wei Meng Bing , Zheng Kai Yuan
Published: August 2014

Based on the critical plane energy method to build a plastic strain energy function on the critical plane, the approach of hot spot plastic strain energy as assessment parameters of fatigue damage is used and the shortcomings that the traditional energy method as a scalar is difficult to describe the direction of crack propagation is overcomed. By the rules of cracks expansion through critical plane, the fatigue life model parameters have a clear physical significance. W-S algorithm process is deduced, so the complex stress state is equivalent to a series of symmetric cyclic stress based on energy and structural damage caused by everyone is calculated. The research, fatigue life prediction of the key component on CII platform under random waves and flow loadings, has theoretical significance and value of engineering application.