bluuebunny/crossref_metadata_2025 huggingface dataset:
Prediction of Temperature Distributions of Cold Forging Process for a CamBolt by FEM
Authors: Kim Dong Bum , Kim S. , Park Jin Gun , Shin Hyuk Soo , Kim Won Yeong , Lee J. , Lee In Hwan , Cho H.
Published: September 2013

Temperature distributions of cold forging process for a cambolt has been predicted by using finite element method in this paper. The cambolt is used as a part in the steering system of a vehicle for the purpose of driving balanced, so some proper mechanical properties such as strength and endurance limit are required for this part. Moreover, temperature is also an important factor to realize mass production and improve efficiency. However, direct measurement of temperature in a forging process is infeasible with existing technology; therefore, there is a critical need for a new technique.
In this study, the thermo-coupled finite element method has been presented for predicting the temperature distribution. The rate of the energy conversion to heat for the material of workpiece has been defined and the temperature distribution throughout the forging process of the cambolt has been analyzed. Experimental verification of the technique is presented.
The Influence of Fatigue Life for Shoulder Fillet Parameter in Stepped Shaft under Torsion Load
Authors: Yuan Yong Zhuang
Published: September 2013

The principle of fatigue life computation was presented on the basis of local stress-strain method. It was set up that the finite element model of stepped shaft with different radii of round corner and radius ratios. The local stress and strain were computed at shaft shoulder fillet under torsion load. The fatigue crack initiation life was determined by means of local stress-strain method under symmetric cyclic torsion load. The result showed that the fatigue life increased with the values of fillet increase and decreased with the values of radius ratio increase, and the smaller of the transition radius was, the shorter of the life would be.
Consider Roll of Heavy Vehicle's Modeling Research
Authors: Wang Rui , Zhang Hao , Li Xian Sheng , Zheng Xue Lian , Ren Yuan Yuan
Published: September 2013

Existed consider roll of heavy vehicle's dynamics model have defects and deficiencies. Vehicles lateral-load transfer that will lead to vehicles rollover is not considered; the whole vehicles dynamics model neglect unspring masss roll angle while the unspring masss independent force analysis considered the roll angel, the establishment of the model is not consistent in; the model dont have a united positive direction rule for all the variables. Because of all of these defects the model cant rightly reflect vehicles motion status. This paper takes lateral-load transfer as a dynamic variable; unspring masss roll angle is considered when establishing the whole vehicles dynamics model; all variables positive direction is united. Reasonable, right, applied to evaluate vehicle's rollover stability and quite newly model is established.
Factor Analysis of Dynamic Characteristics of Balance Valve Effect on the Stability of Crane
Authors: Xie Xin Hua , Liu Xiao Feng
Published: September 2013

Balance valve is the key component of crane lifting system, its performance determines the hoisting performance. Through in-depth study on the dynamic characteristics of the balance valve, find out the influence of parameters of the stability of the system, and carried on the simulation analysis using AMESim software, and to find the simulation process, put forward the optimization measures.
Optimal Design of Wind Turbine Blades with Wilson and BEM Method Integrated
Authors: Ding Jiao Jiao , Wang Hao , Sun Li Ping , Ma Bing
Published: September 2013

This paper presented a new dynamic optimal design method of wind turbine blade which combined the Wilson model with the BEM aerodynamic model. Considering the wind energy utilization coefficient as the target function, the Wilson theory was used to optimize a 1.5MW blades aerodynamic shape. The revised distribution of chord and twist angle was nearly of linear change in the main output power section of blade. The optimized wind energy utilization coefficient can reach 0.552, which is very closed to the Betz limitation. In the part of the calculation of aerodynamic performance, considering both the effect of solidity and eddy current loss on the aerodynamic performance calculation, and also considering the sensitivity of the initial value in a nonlinear equation, it utilized the blade element momentum theory (BEM) which was a classical method on the aerodynamic performance of blade to calculate the aerodynamic performance.The results shows the optimized power output can be up to 1.3426MW, and compared with the rated power, the efficiency reached 89%.
Abrasive Waterjet Cutting of Aluminum Alloys: Workpiece Surface Roughness
Authors: Tosun Nihat , Dagtekin Ihsan , Ozler Latif , Deniz Ahmet
Published: September 2013

Abrasive waterjet machining is one of the non-traditional methods of the recent years which found itself a wide area of application in the industry for machining of different materials. In this paper, the surface roughness of 6061-T6 and 7075-T6 aluminum alloys are being cut with abrasive waterjet is examined experimentally. The experiments were conducted with different waterjet pressures and traverse speeds. It has been found that the surface roughness obtained by cutting material with high mechanical properties is better than that of obtained by cutting material with inferior mechanical properties.
Numerical Simulation of Gear Shaping for Planetary Gear Based on the MASTA Software
Authors: Yi Lai Hua
Published: September 2013

In this paper, the gear shaping of some planetary gear was simulated. The simulation results show that via the gear shaping process, the gear tooth surface on the left has a single tooth pitch deviation of about 1.2 um, and the gear tooth surface on the right has a pitch deviation of 1.1 um, accordingly. By combining the simulation of two-dimensional and three-dimensional gear shaping models, this paper can not only realize accurately the gear shaping process of the planetary gear, but also provide some certain reference for the gear shaping processing.
Spectral Element Simulation of Complex Particulate Flows
Authors: Liu Don , Wang Yi Fan , Zhang Hai Bo
Published: September 2013

This paper uses a mathematical model Virtual Identity Particles, developed by the author, to simulate conjugated motion of complex particles in a fluid. Assimilated the advantages of Eulerian and Lagrangian approaches, this model treats each particle as a variable source term to the fluid and is designed for simulating numerous particles in two-phase flows. The economic formulation in this model is the salient feature. Considering both precision and computational cost, this model maintains an excellent balance between accuracy and efficiency in modeling particulate flows with complex particles. Simulation results demonstrate that this model is viable for investigating complex particulate flows, especially at a moderately high particle number density.
Research on Multi-Solver Simulation Interface of Aero-Engine Compressor
Authors: Zhao Yang , Jin Jie , Fan Jiang
Published: September 2013

Establish a CFD simulation interface for compressor aerodynamic analysis based on general CFD software. The simulation interface includes data format, process and interface standard. Data format based on CGNS is built for cross-platform restoring and retrieving mass data. The designing of process references the process of general CFD analysis and the compressor aerodynamic analysis. The interface standard is used to import and the parameters and export them into corresponding profiles according to the demand of different computation modules. Validation results for the simulation interface using a single-stage transonic axial compressor fan ATS-2 shows that the setting process is more convenient and achieves a certain degree of automation.
Design and Experimental Research of a New Horizontal Wave and Flow Generation Device
Authors: Wang Shi Ming , Lei Dao Tao
Published: September 2013

According to the current needs of the independent power supply to the offshore marine equipment and reefs, as well as the serious status of the world's energy crisis, environmental pollution, we design a miniaturized modular turbine marine energy generation device. With turbine which is circular evenly arranged vane typed as its wave flow capturing device,and through the spindle which fixedly mounted with the turbine, transmiting the captured energy directly to the generator which is mounted at the end of the spindle,eventually the entire device achieves single-stage transmission,and overcomes the problems such as low conversion efficiency and complicated structure in comparision with the traditional multi-stage conversion power generation device.The entire device achieves offshore running by buoys floating, anchor chain mooring and data remotely controlling .With the establishment of the program, 3D modeling and simulation,prototype production and processing, performance testing of key components and prototype flume tests,the project has got a lot grades.The device can extend to the multiple complementary power supply system with offshore wind, solar and so on,and achive integrated system to islands with low-cost power supply,desalination and sewage treatment,which has a good prospect.
About Determination of Stress Concentration in Bodies of a Complex Shape
Authors: Zhuravlev G.A. , Drobotov Y.E.
Published: September 2013

The review of researches of stress concentration in elastic bodies with loaded ledges, which are carried out with separate analysis of each of the force factors, is provided. The known results of using of such an approach are shown for example, the effects of geometrical concentrators curvature are revealed, and on their base principally new nonpole gear systems are developed. The recommendations for significant refinement of the known method are given.
Influence of Slope Gradient on Distribution Rule of Geostress Field in River Valleys
Authors: Pei Qi Tao , Li Hai Bo , Liu Ya Qun , Jiang Jun Gang
Published: September 2013

During the construction of hydropower station, the change of slope gradient in river valleys often takes place. In order to study influence of slope gradient change on distribution rule of geostress field, the three dimensional unloading models under different slope gradients were established by finite difference software (FLAC3D). After numerical simulation, the results were as follows: (1) The phenomenon of stress concentration at the bottom of river valleys was obvious, which appeared the typical stress fold. Both the depth of stress concentration zone and the principal stress values significantly increased with the increment of slope gradient. (2) Maximum principal stress values increased less in shallow part of upper bank slope (low stress zone) but increased more in the nearby slope foot with the increment of slope gradient, causing great difference in geostress field of bank slope. (3) There was some difference in released energy of bank slope due to slope gradient change in river valleys. In order to distinguish the difference, stress relief zone was further divided into stress stably released zone and stress instability released zone. Finally, take Ada dam area of the western route project of South-to-North Water Transfer as an example, the results by numerical simulation were reliable through comparing the distribution rule of geostress field for the dam, which could provide important reference for stability of the design and construction of steep and narrow river valleys.
3D Displacement Vector Field Analysis Technology Application for Analysis of the Slope Surface Deformation Monitoring
Authors: Sun Hua Fen , Hou Ke Peng
Published: September 2013

The traditional analysis of slope deformation is only paying attention to the study of slope displacement velocity, while ignoring the displacement direction. therefore, this paper is proposed to use the 3Ddisplacement vector analysis method to analyze the data of the slope deformation monitoring. Take in Yunnan open-pit mine as an example, Using MATLAB software, draw the slope deformation 3Ddisplacement vector field graph, through the analysis of the characteristics of 3Ddisplacement vector field, it is shown that 3D displacement vector field can directly, accurately show the whole deformation of the slope, we can judge the deformation mode stability state of the slope and slope. this method can provide a reference for similar projects.
Preparation and Water-Absorbing Capacity of Poly(Acrylic Acid)/Montmorillonite Composites
Authors: Chen Kui , Zhang Tian Yun , Zheng Xiao Ping
Published: September 2013

Poly (acrylic acid)/montmorillonite (PAA/MMT) superabsorbent composites was synthesized by high temperature rapid-induced solvent polymerization reaction. The structure of this composites was investigated by XRD. The relationship between reaction condition and water-absorbing capacity of this composites was researched. The result shows that, when montmorillonite content is less than 5 wt%, PAA/MMT composites is nanophase materials. With the increase of cross linker, neutralization degree of acrylic acid, or montmorillonite content, water-absorbing capacity of prepared composites first rises then decreases. When cross linker content is 0.225 wt%, neutralization degree is 70%, and montmorillonite content is 5 wt%, PAA/MMT composites possess microporous structure and its water-absorbing capacity is 511 times of the solid weight itself.
Effect of Limited Water Supply on Photosynthetic Characteristics of Spring Maize (Zea Mays)
Authors: Zhang Heng Jia , Li Jun Hui
Published: September 2013

A trial was carried out to investigate the effect of limited water supply on leaf area duration (LAD), relative growth rate (RGR), crop growth rate (CGR), and above-ground biomass (AB) of spring maize. The results indicated that the LAD was significantly (p<0.05) increased by 10.6%, 15.4%, 16.9%, 19.3%, 13.4% and 17.0%,12.2%, 19.7%, 18.4%, 20.9% in MI1, MI3, MI4, MI5, CK than MI2 during both 12-leaf stage to heading and heading to silking. There was no significant difference (p>0.05) in RGR among all the treatments and check during 6-leaf to 12-leaf stage and silking to middle grain filling, but significant difference occurred during other measured stages. Also, significant difference was found in CGR among some treatments and check during all the measured growth stages. The maximum AB of maize was maintained in CK with 23.0 t ha-1, significantly improved by 16.2%, 16.2%, 22.3% and 41.1%, 35.3% respectively than in MI1, MI4, MI5 and MI2, MI3, and the minimum AB was recorded in MI2 with 16.3 t ha-1.
Simulation Study of HTP Decomposition within Silver Screen Catalyst Bed of the Monopropellant Gas Generator
Authors: Wang Wei , Xia Bi Zhong , Sun Hong Hua
Published: September 2013

This paper discusses the use of FLUENT to model the flow field of high text peroxide (HTP) as it is catalytically decomposed in the silver screen catalyst bed. 2-D model is used to study the process. The catalytic reacting flow, coupling with heat and mass transfer, is modeled in detail. By modifying physical properties of the H2O2 and H2O, the flow is modeled as single-phase flow. From the HTP monopropellant gas generator system perspective, it is demonstrated that chamber diameter, mass flow rate, and wall condition are important parameters for the design of the gas generator.
Research on Length Optimization of Fiber of Length Measurement Method Based on Opto-Electronic Oscillator
Authors: Zhu Ji Gui , Guo Ting Hang , Zhang Tao
Published: September 2013

Precision length measurement is one of the key techniques of modern manufacturing and industrial mechanics. Taking advantage of the high sensitivity and the corresponding relation between oscillation frequencies and group delay of the loop, the novel length measurement method based on Opto-Electronic Oscillator promises high accuracy absolute length measurement at long range. The length of optical fiber, which affects the characteristic of measurement and signal spectrum, is the key variable parameter, and has a great influence on the length measurement error. In this paper, the most important fiber-length-dependent errors, including the thermally-induced error and the error induced by frequency measurement error, are theoretically analyzed based on the principle of OEO. The fiber-length-dependent error model is established. And the optimum fiber length is deduced according to the model, and practical optimal design way of fiber length is proposed to reduce length measurement error. Experiments on different length of fiber are carried out to verify the optimization of this length measurement method. The results are insistent with the theory, showing the optimization method is effective and practical to reduce the fiber-length-dependent error.
5mm × 5mm Sized Slug on High Power LED Stress and Junction Temperature Analysis
Authors: Sauli Zaliman , Retnasamy Vithyacharan , Fuad Fairul Afzal Ahmad , Ehkan Phaklen , Vairavan Rajendaran , Khalid Nazuhusna
Published: September 2013

Conventional incandescent lamps are being replaced by high power light emitting diode as a lighting source due to it ascendancy in terms of physical size, performance, output and lifetime. Nevertheless, the reliability and efficiency of the LED is dependent on the junction temperature. This study presents the thermal simulation of single chip LED package with 5mm x5mmx 1mm aluminum heat slug. The junction temperature and stress of LED chip were evaluated using Ansys version 11. Input power of 0.1 W and 1 W were applied to the LED. The simulation results showed that at input power of 1W, the maximum junction temperature and stress of the LED chip is 112.91°C and 263.82Mpa respectively.
Monitoring the EDM Characteristics of Ti-6Al-4V Process Stable Using Individual Moving Range Control Chart
Authors: Tai Shih Hung , Hsu Chun Yao , Lin Ching I
Published: September 2013

This study deals with the optimization of the process parameters, with regard to multiple performance characteristics, involved in the electrical discharge machining (EDM) of titanium alloy (Ti6Al4V).Based on the grey-Taguchi method were conducted to examine the effect of EDM parameters (pulse current, open voltage, pulse-on-time, and duty factor) on the electrode wear rate, material removal rate and surface roughness. Experimental results indicate that optimal process parameters can be determined effectively so as to improve multiple EDM qualities through this approach. Furthermore, control charts tell us when special causes of variation are impacting machining process. Control charts are basic and powerful tools in statistical process control and are widely used to control various industrial processes. The aim of statistical process control is to explore the predictability of a process. It was found that the EDM process and product characteristics are stable over time.
Research on PCA Based Sensor Fault Detection and its Application
Authors: Cheng Li , Yao Zhi Gang
Published: September 2013

This paper deals with problem related to fault detection in complex process with various sorts of sensors. Not model based but data-driven multivariate statistical process monitoring approach PCA is proposed, fault detection indices statistic and square prediction error are discussed and their complementary relationship is also presented. Availability and reliability of the method proposed in this paper is verified by experimental example.
An Extrema Extension Method Based on Support Vector Regression for Restraining the End Effects in Empirical Mode Decomposition
Authors: Xue Xiao Ming , Zhou Jian Zhong , Zhang Yong Chuan , Jian Xiao , Wang Xue Min
Published: September 2013

The end effects is a serious problem in the applications of the empirical mode decomposition (EMD) method. To deal with this problem, an extrema extension method based on the support vector regression (SVR) is proposed in this paper. In each iterating process of the EMD method, the SVR method is employed to predict one maximum and a minimum point respectively at the both ends of the original data series to form the relatively true upper and lower envelope, thus the end effects can be restrained effectively. The prediction of an extrema point includes two parts, the forecast of the extreme value and location. In contrast with other traditional extrema extension methods, such as the extrema mirror extension and linear fitting extension method, the decomposed results from the simulation and actual signals demonstrated that this proposed method has a better performance in eliminating the end effects related to the empirical mode decomposition.
Near-Infrared Spectroscopy Signal Extraction and Processing Design
Authors: Zhao Ke , Jiang Jian Hua , Fu Jun Fang , Xu Jin Bo
Published: September 2013

This paper introduces the MSP430 MCU-based near-infrared spectrometer front-end signal extraction and software signal processing design.The system adopts phase locked loop technology to signal phase shift processing. Phase sensitive filtering function achieved by the balance modem AD630.Finally the analog signal is converted to digital signal by AD7715 for the microprocessor processed.Microprocessor receives digital signal, filter processing is performed using a first order lag filter method to determine the point of measurement value.Through the comparison analysis of the experimental testing result, the program has higher signal-to-noise ratio and suppress interference ability, high reliability, good stability,etc.
Cutting Performance of Cemented Carbide Using Single Crystal Diamond for Tool Material in Die and Mold Manufacturing
Authors: Kazumasa Kawasaki , Katsuya Fukazawa , Satoru Higuchi
Published: September 2013

In this paper, the cutting performance of cemented carbide with ultrafine particles using single crystal diamond for tool material in die and mold manufacturing is investigated. The flat work is done using spiral for tool pass. The flat work is divided into small area and middle area. The spiral pitch in addition to depth of cut is changed in flat work. The tool wear is also estimated from form deviation by measuring surface form before and after machining. These results showed that ductile mode cutting was possible and the tool wear could be estimated from surface form. The tool wear was large in proportion to both the depth of cut and cutting length.
Experimental Analysis of Laser Scattering Patterns for the Surface Inspection of Crystalline Wafers in Solar Cell
Authors: Kim Gyung Bum
Published: September 2013

The surface inspection of crystalline silicon wafers is of importance in manufacturing processes for solar cells. In this paper, The laser scattering mechanism is designed and manufactured through detailed investigations of the light scattering characteristics. Its parameters are to be optimally selected to obtain effective and featured patterns of laser scattering. The optimal parametric ranges of laser scattering are determined using the mean intensity of laser scattering. As a result of the experimental analysis of laser scattering patterns, two pieces of evidence that are effective for the detection of micro defects are extracted. It is confirmed that the two features are regarded as important information for the detection of defects in crystalline silicon wafers. The usefulness of the designed mechanism and of extracted features is verified through experimental results.
A Research for Angle Optimization of the SRM Used in Electric Actuator of Valves
Authors: Yang Ding Hong Yang , Zhao Dean , Jiang Ying Xin
Published: September 2013

This paper uses TMS320F28335 DSP and MAX3032S CPLD as the controller of the 6/4 pole switched reluctance motor (SRM), and controls the motor by the method of current chopping control (CCC) in low speed and the method of angle position control (APC) in high speed. About the optimization of turn-on angle and turn-off angle when SRM is controlled by the method of APC, this paper discusses the optimal design of the two parameters by ways of theory research, simulation and experimental testing. The results show optimal switching angle can make speeded-up of the motor better and improve the performance of SRM.
Design and Implementation of Constant Palstance Control System of Combine Cylinder Based on STM32
Authors: Yan Jian Li , Zhao De An , Qin Yun
Published: September 2013

Combine harvesters are widely used in agricultural production. Keeping the palstance of combine threshing cylinder constant when the combine works normally has important implications, through which can improve the efficiency and guarantee the quality. In this paper the Foton Lovol GF40 combine is used as the controlled object, then a constant palstance control system is designed based on STM32, and the control program is also designed based on the fuzzy PID algorithm. The control system can receive the signals of feed quantity and cylinder palstance, then drive the HST system and change the walking speed according to the change of the signals received, thus to control the cylinder palstance. Field trials verify the feasibility of the system, show that the system has a certain stability, which can achieve the desired effect.
Design of Robot Lawn Mower Based on Computer Vision
Authors: Wang Fa Yu , Gao Zhen Li , Yin Hong Yu
Published: September 2013

In this paper, we introduce a new research about mowing robot on obstacle avoidanceand path tracking controlling theoretically and practically, and propose the mowing control methodwhich based on computer vision. Lawn images collected by camera, through the extraction ofprogramming dealing with lawn, obstacles and boundary characteristics to achieve edge separation.Through special processing algorithm to determine boundary arises and obstacles location, size andspeed of the robot, with real-time capturing and processing. This paper gives the complete imagerecognition processing, and analyzes several methods of image filtering and edge detection, andproposes simple control algorithm for obstacle avoidance, and applies MATLAB for obstacleavoidance simulation. The results show that: the method can correctly identify the obstacles andboundaries, through the output about location, size of the obstacles and boundary, border slope andspeed of the robot to control robot mower. Most importantly, that computer vision applying in themowing robot itself is an innovation.
Bottleneck Simulation of Two-Lane Traffic CA Model with Turn Signal
Authors: Kang Rui , Yang Kai
Published: September 2013

Based on the STCA model, an improved two-lane traffic CA model in view of turn signals is proposed. The model considers changes in driver behavior before and after the signaling of the leading vehicle, and introduces rules of changing lanes, cutting lanes and yielding the right of way for the flowing vehicle. Through computer numerical simulations, this study has presented time-space diagrams and also analyzed the effects of driver behavior of the rear vehicles on traffic flow. The results reveal that a higher rate of cutting lanes incurs a heavier traffic flow in normal situations while yielding the right of way relieves traffic congestion in a bottleneck situation. Compared with the traditional model, STCA model can depict more complex traffic situations resulted from different driver behaviors and reproduce a more realistic process of traffic flow.
Development of Robotic System for Free-Form Surfaces Polishing Based on CAM Data
Authors: Lin Feng Yun
Published: September 2013

Polishing, a kind of finishing process done after machining is necessary to obtain a good surface roughness as well as the form accuracy. In this paper, instead of manual polishing work, a robotic polishing system is introduced. A trajectory generator needed for generating the robot polishing path are taken from the cutter location data generated from the postprocessor of a CAD system. Using the trajectory generator, the present polishing robot doesnt need the conventional complicated teaching process. Position interpolation algorithm between two CL data is proposed, and the robot control commands can also be generated using an industrial robot Motoman sv3.
Adaptive Control for NC Position Table Base on Radical Basis Function Neural Network
Authors: Ma Jing , Wu Hong Yu , Ji Xiao Ming , Lei Yan
Published: September 2013

Dynamic optimization control algorithm is put forward for X-Y position table. Firstly, dynamics model of X-Y position table is established, then, RBF neural network with good learning ability is used to approach non-linear system. Optimization algorithm of network weights is designed to speed up the learning speed and the adjustment velocity. The control method is more effective to improve the control precision and has a good application value.
Shear Speed Analysis on Sn-3.9Ag-0.6Cu Solder
Authors: Sauli Zaliman , Retnasamy Vithyacharan , Fuad Fairul Afzal Ahmad , Ehkan Phaklen , Say Ong Tee , Vairavan Rajendaran
Published: September 2013

Ball Grid Array (BGA) is a type of semiconductor interconnection used in Integrated Circuit (IC) which is being scaled down to micro and nanosize. The reliability of BGA in IC becomes a concern as the size of IC reduces. Hence, this leads to the study of stress on the BGA. This paper discussed the load effects of varying shear speed analysis on the BGA. A Pb-free material, Sn-3.9Ag-0.6Cu solder was applied in the simulation. Shear height value is fixed while the shear speed is varied to investigate the dynamic stress on a BGA package using Ansys software. The results from the graph plotted showed that higher shear speed results to higher shear force.
Research on the Developing Platform for Complex Product
Authors: Wu Shu Fang , Su Tie Xiong , Wang Zong Yan
Published: September 2013

Aiming at problems of repeated labor and low level of information sharing and integration degree in design process, an integrated design method based on MCSSMW (Multi Client Single Server Multi Workstation) work pattern for complex product is proposed. Integrated developing platform based on PDM was proposed after the detailed analysis of large-scale complex product modular decomposition mechanism and communication mechanism in distributed collaborative design. an integrated design platform for multi-user casting crane is developed, and the proposed method's validity is verified by the example.
An Improved Bat Algorithm and its Application in the Logistics Distribution Center Location Problem
Authors: Li Yue Guang
Published: September 2013

In this paper, according to the characteristics and influence factors of the distribution logistics and distribution center problem, a mathematical model of the distribution center of the LRTWP (Location and Routing with Time Window Problem) was established. An improved bat algorithm was used to solve the model, the parameter and selection operator in the algorithm is set reasonably. Simulations and results indicate that the improved bat algorithm has better feasibility and validity for solving the LRTWP.
Internet Public Opinion Monitoring Model Based on Cloud Computing
Authors: He Zhong Tang , Zhang Xiao Qing , Zhao Feng Wei , Ji Tong Kai
Published: September 2013

With the rapid development of online social networks, such as social network services, BBS, micro-blog and online community, et al., a two-way communication and new media age has been gradually coming. Each one can create their own content and publish the news quickly through online social networks on Internet. Thus, mass data has brought severe challenge to public opinion monitoring. As a kind of novel information computing model, cloud computing technology can effectively deal with the calculation and storage of mass data. In this paper, the public opinion monitoring model based on cloud computing environment is introduced, which can mine and analyze large scale collected data, realize detection and tracking of hot topics, perform social network analysis on the BBS and visualize the analysis results. The public opinion monitoring system based on cloud can provide timely sensitive information and deal with public crisis efficiently. Finally, the advantage is analyzed when cloud computing is applied to public opinion monitoring.
Three-Dimensional Process Design of Large Complex Mechanical Product
Authors: Meng Biao , Wu Zheng Liang , Yan Ya Jun
Published: September 2013

With the Model Based Definition technology applied in the aviation manufacturing industry, the 3D model becomes the only basis to design and manufacture. The 3D manufacturing process design becomes the link between three-dimensional design and three-dimensional manufacturing. Here, the relations are analyzed between the traditional manufacturing model and three-dimensional manufacturing model, and the key technology and method of 3D manufacturing process design are made clear. Furthermore, three-dimensional process system architecture is proposed combining the enterprise application integration and data management requirements. Finally, a practice result of enterprise information project mentioned as an example, which would be the foundation to establish the complete three-dimensional development system.
Fabrication and Properties of WC-Al2O3 Cemented Carbide Reinforced by Single-Walled Carbon Nanotubes
Authors: Bai Tao
Published: September 2013

WCAl2O3-Carbon nanotubes (CNTs) composites were prepared by hot pressing process. Effects of trace amount of CNTs additives on the microstructure and mechanical properties of the WCAl2O3 were investigated. The microstructure, phase identification and hardness of composites were analyzed by using optical microscopy, X-ray diffraction (XRD) and Vickers indenter. The experimental results indicate that both the WCAl2O3 doped with 0.1wt% CNTs and 0.5wt%CNTs possessed the refined microstructure and enhanced mechanical properties compared with that of the WCAl2O3 doped with 1wt% and 1.5wt% CNTs. When CNTs were added to the WC-Al2O3 composites, the decarburization suppression could be achieved in the WC-Al2O3 powders system.
Experimental Study and Finite Element Analysis of Concrete Simple Supported Beams Strengthened with Externally Prestressed CFRP Tendons
Authors: Xu Feng , Huang Le
Published: September 2013

The concrete simple supported beams were strengthened by an innovative device mainly includes oblique screws and linear CFRP tendons. A static experimental study and finite element analysis were conducted to research the flexural capacity and stress changes of CFRP tendons of strengthened beams, and the contrastive analysis was explored between finite element calculation results and test results. The results indicate that the strengthen system can significantly improve the flexural capacity of concrete beams, there is basically a linear relationship between the stress increment of CFRP tendon and the deflection of midspan section, and the finite element calculation value is in agreement with the test results. Based on this, the stress of concrete near holes was analysed using finite element method (FEM), which can provide a reference for practical engineering application.
Wind Resistance Research and Wind Tunnel Test of Large-Span Roof Based on Yancheng Financial Center
Authors: Liu Fei , Zhang Zhi Qiang , Fang Zi Fen
Published: September 2013

A large number of buildings with large-span or complex-shape have come to the fore in recent years. To these structures, wind load tends to be control load in the structural design. Shape coefficient of wind load which Chinese load code for the design of building structures can provide is extremely limited due to complex-shape of long-span space structures, therefore carrying our related study is of great practical significance. Yancheng Financial Center model is established in this paper based on ETABS software. The acquired date in the use of wind tunnel test is to simulate wind load which is on the structure and to analysis stress distribution of critical element in order to ensure safety and applicability of structures. This paper mainly covers wind tunnel test, equivalent static wind load, and wind-induced response, etc.
Simplified Model to Predict Load-Bearing Capacity of Concrete-Filled Steel Tubular Laced Column
Authors: Zheng Lian Qiong , Guo Shu Li , Zhou Ji Zhong
Published: September 2013

A simplified method using an equivalent slenderness ratio was suggested to calculate load-bearing capacity of concrete-filled steel tubular laced column in this paper. The significant differences between compressive and tensile strengths of concrete-filled steel tube were considered. The comparisons between the predicted Nuc and the tested Nue showed that the predicted method gives generally good predictions of the test results.
Research Progress on Mechanical Properties of Chinese Ancient Mortise-Tenon Joints
Authors: Song Xiao Sheng , Su Jing Yu , Guo Xiao Dong
Published: September 2013

Mortise-tenon joint is an important characteristic of Chinese ancient timber buildings. Survey on mortise-tenon joint of Chinese timber structures in the last twenty years is summarized and reviewed in five aspects as follows: (1) load transfer mechanism, (2) the relationship of M-θ, (3) the failure characteristics, (4) carrying capacity, and (5) seismic performance. Finally, research on the strengthening of mortise-tenon joints is presented in this paper.
Stress State of Hemispherical Shell in the Frontal Movement of the Radiation Field
Authors: Andreev Vladimir I. , Dubrovskiy Ivan A.
Published: September 2013

The article considers the influence of neutron flux on the reactor hemispherical shell protection, depending on time. Diagrams of the variations of modulus of elasticity, of strain and stress appearing during the operation of the nuclear power plant are given.
Field Testing of a Wind Turbine Tubular Tower and Structural Design of a Space Frame Steel Tower
Authors: Wang Xiang Yang , Dai Kao Shan , Huang Yi Chao
Published: September 2013

Wind energy industry has been growing tremendously in recent years. Tubular steel towers are currently dominant supporting structures for wind turbines. With the increase of the converter capacity, there is a great demand for higher supporting towers. However, structural vibrations in extreme wind events tend to become a major concern during tower design. To study wind turbine tower dynamics, an existing tubular steel tower was tested. Vibrational frequencies and damping ratios were identified. To avoid unexpected dynamic problems, a space frame steel tower has been proposed for supporting larger wind turbines. It is a structural system that can be assembled on-site by using prefabricated beams, columns, and brace members. A typical space frame steel tower was designed in this paper. Static loading, modal and buckling analyses of the tower were presented. It is expected to introduce engineers and designers more options for wind turbine tower design.
A Study on Fracture Characteristics of Widened Beam Flange Joints
Authors: Dong Jian Li , Wang Yan
Published: September 2013

By the method of ANSYS finite element analysis, this paper in depth studies the affection of widened width and length of the widened beam flange joints on seismic behavior of the ultimate load and ductility performance. According to the test and failure results of finite element simulation specimen the cracking possibility of the weak link easily leading to fracture of joints is evaluated. By introducing the equivalent plastic strain index, the fracture mechanism of widened beam flange joints is analyzed theoretically. The research can provide valuable data and reference for the seismic design of steel frame joints.
The Application of Cable's Arrangement and Stability on Prestressed Cable-Beam Structure
Authors: Xie Xin Ying , Yin Xin Sheng
Published: September 2013

The paper analyzes the basic theory of prestressed concrete cable-beam structure in single span and single direction.The paper arranges reasonably the shape of cable,deduces the equation of cable. It introduces the reseach status and the importance of stability and demonstrates the basic relative theory on stability in concretely research and applies this theory on prestressed concrete cable-beam structure. It has significant prospect and is easy to put into practice .
Research on Horizontal Bearing Behaviors of Circular Section Static Compaction Piles
Authors: Yang Qing Guang , Liu Feng , Xiao Luan
Published: September 2013

Based on Vesic theory of cavity expansion and Mohr-Coulomb yield criterion,A method was proposed which can be used to calculate earth pressure around circular section static compaction pile.Furthermore, a formula calculating earth pressure around circular section static compaction pile with horizontal displacement was deduced based on hyothesis without relative displacement on pile-soil contact boundary.Finally,according to the research above and force balance condition,an estimation method for horizontal bearing capacity of circular section static compaction pile was gotten.In order to validate the feasibility proposed theory in this paper, a comparative research was carried out.Both experimental and theoretical results indicated that earth pressure on pile-soil contact surface of soil compaction pile was much more than of pile without soil compaction and earth pressure would redistribute with change of horizontal displacement.Moreove,because horizontal bearing capacity calculated by method in this paper accorded with result measured in field very much,the theory in here was feasible.
Research on Performance Effect Factors of Flexural Member for Concrete Filled Rectangular Steel Tube
Authors: Song Ji Qiang
Published: September 2013

Today large concrete filled rectangular steel tube members are widely used in large-scale civil engineering. The influence of the concrete filled steel tube members to different types of the steel tube concrete structure, which are with different concrete strength grade, is different. The main factors influenced the flexural member of the concrete filled rectangular steel tube are analysed in this paper.
Numerical Study about Damping Effect of Liquid Damper on Tall Buildings
Authors: Zhu Feng , Ying Geng , Zhu Wei Hua , Lu Ziai
Published: September 2013

Based on the finite element method, three models are built: classical solid model, potential flow model and a combination of fluid-structure coupling model. Based on the above model the damping mechanism of tuned liquid damper has been investigated. Study focused on classical solid model and the boundary constrained potential fluid model respectively. After the completion of the above calculation, the analysis of bidirectional fluid-structure interaction model being carried out with the implicit dynamics algorithm. The results shows the contrast of the dynamic response of structure in the hydrated and anhydrous state. The calculations show that: the additional water mass can effectively reduce the natural vibration frequency of the structure, and it also can effectively reduce the displacement and velocity response of structure under vibration loads.
Fuzzy Hierarchy Analysis of Gravel Pile Stability
Authors: Zhang Jing , Shangguan Zi Chang , Sun C. , Jia Shuo
Published: September 2013

This thesis introduces a brief of the development status of the gravel pile and the basic principles, and analysis of vibration displacement stone column foundation treatment influencing factors by the Analytic Hierarchy Process. To compare and analyzed from it, and apply the square root method to calculate their weight; According to the evaluation set structure distribution trapezoidal membership function, and get the final membership of each index to evaluating set and fuzzy relation matrix; By the analysis of application of a wharf, and find out the comprehensive score stability gravel pile system, we have certain reference from it in the future.
Nonlinear Analysis on Ultimate Flexural Bearing Capacity of the N-Shaped Steel Tubular Joints
Authors: Liao Xian , Yong Jun , Wang Zhong Qing
Published: September 2013

As the author has discovered in the pratice of the project design, the steel pipe size in the truss structure will increase with the expanded span of the spatial structure, far exceeding its original range of application. Therefore, the resulting effect of the joint additional moment on the steel pipe crossing nodes should not be ignored, and how to calculate the ultimate flexural capacity of the steel tubular joints has become an urgent problem to be solved in the joint design. However, the research on ultimate load-carrying capacity is mainly restricted in utilizing the current data and Code for Design of Steel Structures to analyze the axial load-carrying capacity, and the research on ultimate load-carrying capacity of the joint under additional moment is still inadequate. This paper, from the joint stiffness perspective, initiates with brief analysis of the effect of steel pipe size on the joint additional moment so as to illustrate the rationale and necessity for taking into account the joint additional moment in the steel pipe structure, and follows with the adoption of both three-dimensional four-joint 181 elastoplastic shell element and the finite element model (by which N-shaped circular steel pipe crossing nodes is established for the ideal elastoplastic material in ANSYS finite element program) to fit the formula for the flexural capacity of the N-shaped joints based on orthogonal test method and regression technique with geometric nonlinearity and material nonlinearity taken into consideration. It is designed to provide some reference for the design and application of steel tubular intersecting joints in the future.
Experimental Study on Bearing Capacity of Cross-Sections of Carbon Fiber-Reinforced Concrete Beam under Salt Damage
Authors: Yan Xi Kang , Qin Ling , Du Chuang , Chen Pei
Published: September 2013

In this paper, in order to simulate the corrosion of seawater, the drying-wetting cycling test was used. The mechanical properties of carbon fiber-reinforced concrete beam under salt damage were studied and the reinforcement effect of the CFRP was analyzed. At the same time, the bearing capacity of cross section of CFRP strengthened PC beam under corroded was analyzed.
Mechanical Performance of the Different Structure Based on Shrinkage and Creep
Authors: Yang Wei Jun , Li Yao
Published: September 2013

t is adopted the CEB-FIP (1990) shrinkage and creep model for analysis in three different structure by making a comparative analysis of the existing shrinkage and creep model. The influence law of different structure is obtained. It is shown that the hybrid structure system of concrete structure and steel structure can coordinate both force performance and make it is more consistent with design value.
Crack Mechanism, Temperature Control, and Anti-Cracking Measures of Sluice
Authors: Wang Zhen Hong , Zhang Guo Xin , Yu Shu Ping
Published: September 2013

To address the problem of sluice concrete easily cracking during construction, this study introduces the crack mechanism of concrete structures. Temperature differences and constraints are the main causes of cracks. Anti-cracking measures should focus on optimizing concrete mixing ratio and improving construction technology. Using simulation calculation to model the actual construction process and temperature control measures, this study analyzes the causes of crack and selects timely and reasonable temperature control measures, which are necessary links in engineering construction. A three-dimensional finite element analysis was conducted for a huge concrete sluice structure. The causes of cracks are discussed, and timely and feasible anti-cracking measures are proposed to provide technical support for project construction.