bluuebunny/crossref_metadata_2025 huggingface dataset:
Optimization on Deep Drawing and Ironing Process of Compressed Natural Gas Containers
Authors: Xu Wu Jiao , Zhai Chun Hai , Li Wu Hua
Published: September 2013

In this article, the influence of different process parameters on the bottom thickness of CNG container during the deep drawing and ironing process has been analyzed by simulation. The bottom die fillet R, the spacer height H between blank holder and bottom die and the friction coefficient μ between punch and billet were selected as parameters for optimization. The simulation results reveals that the appropriate bottom die fillet R and spacer height H is needed to reduce the thinning of product bottom. Meanwhile, the bigger the friction coefficient μ, the thicker the product bottom. The optimized results were utilized in the experimental production and the products in the three passes meet the designed requirements, which illustrates that the simulation results have great help for the actual production.
The Planarization Technology of Optical Element Surface
Authors: Guo Cheng Jun , Pei Ning , Wang Da Sen , Nie Feng Ming , Zhang Guang Ping , Li Yu Peng
Published: September 2013

The appropriate planarization layer is the foundation for realization of ion beam deposition correction polishing technology, the significant difference between ion beam deposition correction polishing technology and ordinary ion beam polishing, is using spin or methods of ion beam sputtering deposition, forming sediments which has planarization effect on the processing surface to reduce intermediate frequency error, coupled with ion beam polishing, removing the high-frequency processing error, the typical error is cut marks by single point diamond turning left on the component surface.
A Fast Solution to the Kiln Support Reactions Based on Axis Monitoring
Authors: Lei Xian Ming , Xiao You Gang , Ning Ai Lin , Yuan Wen Hua , Chen Zhi Gang
Published: September 2013

The support reaction plays an important role to the shell stresses of rotary kiln, which is greatly affected by the kiln axis defection. The displacement measurement method along zero deformation direction is introduced, which can be used to monitor the defection of rotating center of kiln shell at the support pier exactly. The mechanical model to solve the support reactions is built based on the mechanical feature analysis of rotary kiln, and a fast solution to the support reactions is formed, the correlation between the support reactions and the axis defection can be obtained quickly by the method.
Applied Research on Three-Dimensional Measurement Based Digitized Clothes System Platform
Authors: Yang Li Na , Chen Yu
Published: September 2013

The development, promotion and application of three-dimensional anthropometric measurement technology result in the rapid development of applied research on digitized clothes technology that is based on the technology. The paper generally analyzes the status quo and development of research on digitized clothes related applied technologies, including establishment of three-dimensional anthropometric measurement based anthropometric database, analysis and identification of body type for clothes, three-dimensional human modeling, three-dimensional clothes CAD, and mass customization of clothes.
Study of Laser Cladded Layers Structure Applied in Practice
Authors: Kovaříková Ingrid , Hodúlová Erika , Šimeková Beáta , Šalgó Kristián , Kmec Martin
Published: September 2013

The aim of this paper was the study of laser cladded layers applied in practice from the view of the internal structure of the material changes. In the process of cladding the laser beam was used as the heat source to melt and fuse the cladding alloy LS 30 onto the substrate - steel EN 1.2379.The filler material - wire diameter was 0.4 mm and the maximum height of the coating was 0.3 mm. The basic material was in minimal heat treated, in a very narrow intermediate layer with the character of diffusion joint. The cladded layers were evaluated for resistance to abrasive wear and topography of layers was performed. The proposed technology and the filler material have impact on the topography and roughness of the resulting layers.
An Theoretical Study of the EDM Electrolytic Intermittent Grinding Compound Processing
Authors: Yang Jian Ming , Shen Shi Ming
Published: September 2013

Based on processing speed and processing accuracy for difficult-to-machine materials, this paper presents a new MEEC processing method, is based on the basic of MEEC increase on-process dressing grinding wheel, grinding wheel non conductive parts won't jam pore, the abrasive dust adhered to the grinding wheel continues to be removed, the grinding wheel always remain sharp, strengthened the grinding effect, greatly improving the grinding efficiency.
Research on Air Deflector Optimal Design and Matching for Heavy-Duty Vehicle Based on Design of Experiment Technology
Authors: Chen Jing , Song Tao , Wang Deng Feng
Published: September 2013

The drag reduction characteristic of air deflector of a heavy-duty vehicle is examined through CFD simulations and wind tunnel test in this paper. The CFD model of the truck is built using the FLUENT software and the simulation results are compared with the wind tunnel test data to verify the accuracy of simulation model. An air deflector is designed for this truck, A design of experiments approach was chosen as an efficient technique to optimize the design parameter and match with the truck to obtain the optimal drag reduction performance.
Compressor and Throttle Characteristics for Models
Authors: Smolarik Lukas , Mudroncik Dusan , Strbo Milan
Published: September 2013

Turbocharger is a device used for compression of gases of different features. I tis a conversion of kinetic energy or mechanical energy into pressure. Compressed media can be vary from pure gases such as hydrogen, oxygen, noble gases to the gas mixtures such as air, a mixture, of hydrogen and others. Gas composition is very important because of its physical and chemical properties depends on many parameters of compressor design [. The basis of modelling surge dynamics of centrifugal compressors is Greitzerov nonlinear model. This article is getting the gear characteristics of the mass flow and pressure increase passing compression system. Another challenge is getting the throttle characteristic mass flow and pressure drop on the throttling valve. These characteristics are necessary for modelling the dynamic model of a centrifugal compressor according Greitzer (1976). For getting these characteristics, it is necessary to know the data of the measurements. Data can be extracted from a manufacturer. One of the most important graphs is compressor characteristic, known as the compressor map.
Study on Road Geometric Alignment Parameters Based on Vehicle Handling Stability Simulation
Authors: Zheng Xue Lian , Li Xian Sheng , Jiao Cheng Wu , Bai Gang , Ren Yuan Yuan
Published: September 2013

Unreasonable road geometric alignment has a negative influence on vehicle handling stability, especially when vehicle drives with a high speed. For horizontal road alignment, radius and banking of circular curve are the most popular and important parameters. To investigate the influence of horizontal road alignment on vehicle handling stability, a 3 degrees-of-freedom vehicle dynamic model is established. Three road horizontal curves with different radius are established in Carsim environment to investigate the influence of curve radius on vehicle handling stability and four different banking curve roads are built to study the impact of road banking on vehicle roll stability. The research achievement will provide theoretical basis and technical support for road geometric alignment design.
Dynamic Analysis of Helical Planetary Gear Train
Authors: Liu Xian Zeng , Zhang Jun
Published: September 2013

A dynamic model for helical planetary gear train (HPGT) is proposed. Based on the model, the free vibration characteristics, steady-state dynamic responses and effects of design parameters on system dynamics are investigated through numerical simulations. The free vibration of the HGPT is classified into 3 categories. The classified vibration modes are demonstrated as axial translational and torsional mode (AT mode), radial translational and rotational mode (RR mode) and planet mode (P mode) followed by the characteristics of each category. The simulation results agree well with those of previous discrete model when neglecting the component flexibilities, which validates the correctness of the present dynamic model. The steady-state dynamic responses indicate that the dynamic meshing forces fluctuate about the average static values and the time-varying meshing stiffness is one of the major excitations of the system. The parametric sensitivity analysis shows that the impact of the central component bearing stiffness on the dynamic characteristic of the HPGT system is significant.
Usage of Ti-TiO2 Electrode in Microbial Fuel Cell to Enhance the Electricity Generation and its Biocompatibility
Authors: Taskan Ergin , Hasar Halil , Ozkaya Bestamin
Published: September 2013

Microbial fuel cell (MFC) provides the generation of electricity as bacteria on anode electrode oxidize organic content present in wastewater. This study presents simultaneously the electricity generation from two different synthetic wastewater mixtures using a new electrode in both anode and cathode compartments. Results showed that power output increased excessively in the case of Ti-TiO2 electrode. MFC reactors were mainly dominated by Geobacter, Shewanella, Pseudomonas and Clostridium species. The molecular results also demonstrated that Ti-TiO2 electrode is biocompatibility and able to be used in MFC because these species are electricity producing bacteria.
The Method of Tree Dynamic Modeling under Wind Field
Authors: Li Tie Nan , Yu Shun , Yang Feng
Published: September 2013

In order to construct tree modeling, the method is that it is divided into static modeling and dynamic modeling. This paper focuses on the analysis of the key problems in tree dynamic modeling. The object suffers wind power that the force calculated by momentum theorem. And then compare the value of rupture limit to Young modulus. It is determined object to fracture or sway. Then it constructs tree dynamic modeling in the nature.
Simulation Research on Mixing Structure of Kitchen Waste Biological Processor
Authors: Lin Song , Zhang Ran , Ma Zhuang , Liu Chuan Yang
Published: September 2013

According to analyzing the current situation of kitchen waste treatment, the theory of food waste biological processing is introduced. Meanwhile, the classification, the performance index, the applicable conditions of biological processors mixing structure, and the selection basis of blades are analyzed. The method and process of simulating the fluid field of the kitchen waste biological processor is discussed in the paper with the CFD softwareFluent and the Multiple Reference Frames method (MRF), and research result is applied in our product developed.
Effect of Limited Irrigation on Water Consumption and Grain Yield of Spring Maize (Zea Mays)
Authors: Zhang Heng Jia , Li Jun Hui
Published: September 2013

The soil water contents in spring maize field were monitored continuously using soil neutron probe combined with drying-weighing method. Meanwhile, the effect of limited irrigation on crop periodic water consumption and its percentage in total water use, leaf area index, and grain yield of spring maize were explored. The results indicated that both the periodic water consumption and its percentage in total water use varied from low to high then to low within maize growing season, with the maximum valued both at silking to middle grain filling. In addition, leaf area indexes were greatly improved by full irrigation before maize filling, and grain yield was not reduced by efficient limited irrigation management, contrarily, yield increase and 31.1% of significant irrigation water saving were achieved, which was beneficial to the optimization of soil water ecological processing and limited irrigation management.
Design of Dimmable Quasi-Resonant Fly Back LED Driver Based on OZ9992
Authors: Chen Guang Ming , Wu Shuang , Shen Jia Hui , Zhao Ke
Published: September 2013

The paper designs a 30W dimmable constant current LED driver. It is designed by O2Micros OZ9992 control chip, and it use quasi-resonant flyback topology. It can achieve zero voltage to reduce switching losses. The LED driver has higher efficiency and can provide a stable current for LED lamps. It has good dimming performance, and is easy to operate. It is suitable for home, hotel and other occasions, and has broad application prospects.
Micro-Bridge Structure Design of UFPA with Highly Sensitive Pixels
Authors: Fan Mao Yan , Zhang Li Fang
Published: September 2013

The Micro-bridge structure pays an important role in the mechanical support, thermal isolation and electrical connection for the UFPA detector, the quality of which has a direct effect on the imaging performance of the UFPA detector. A kind of Micro-bridge pixel is provided in this paper with thick-film pixel size of 360μm×360μm and desk-type adiabatic frame support, and the analysis results by FEM show that the minor thermal conductivity G and high responsivity can be obtained.
The State Recognition for Rotary Machines Based on Fractal Theory and Neural Network
Authors: Huang Qiang , Ouyang Xiao Zhuo , Huang Qiu Ping
Published: September 2013

A new state recognition method for rotary machines based on the fractal theory and neural network is proposed, and it is analyzed with the example of bushing abrasion of the connecting rod in diesel engine. Firstly, the wavelet theory is used to reduce noises in the vibration signals and then pick up the generalized fractal dimensions with different iterative steps. They will be the input parameters of the RBF neural network, and the output ones are the four working states. After being trained, the model of neural network can identify the states by the vibration signals. According to the experiment and simulation, the wavelet noise reduction can reproduce the vibration signals clearly and optimize the state recognition. The method based on the fractal theory and neural network is demonstrated to be efficient and feasible, and it can identify the states correctly. It has preferable engineering applicability and the referenced value to other vibration diagnosis of rotary machines.
Measurement of Static Performance of Inductive Proximity Switch for a Mobile Robot
Authors: Tsung Tsing Tshih , Nguyen Hoai
Published: September 2013

For a control system, the static performance of a sensor is always a milestone of dynamic performance of the system. The static performance of a proximity switch plays an important role due to it affects the dynamic properties quality of a mobile robot and the results of dynamic identification. A proximity switch is a common sensor to search a metal guideline for a mobile robot. If the signal of a proximity switch is unstable or noise, it is more disturbance for a mobile robot control. Hence, a static performance evaluation of a proximity switch is basic technology for a mobile robot and will be proposed in this paper.
When a proximity switch is used to search a signal of a metal tape as guideline for a mobile robot, there are giant effect so different metals such as diamagnetism, paramagnetism and ferromagnetism in materials. In this paper, the hand-made measurement system is successful development, and 6 types of metals are measured. Through measurement, the static performance of a proximity switch can be fast evaluated and analyzed, respectively. The experiment result shows that the signals of diamagnetism, paramagnetism and ferromagnetism metal tape in materials are giant differences. By using the developed measurement system of this study, the effects of different metals can be fast determined respectively. And base on this static performance, the dynamic performance of a proximity switch can be fast and precisely evaluated. Determining how to rapidly and efficiently control a mobile robot therefore becomes the key point in using the measurement technique of static performance.
A Self-Repairing Control Scheme for Quadrotor Helicopter via Active Disturbance Rejection Control
Authors: Wu Qing Bo , Chen Fu Yang , Wen Chang Yun
Published: September 2013

In this paper, a self-repairing control scheme for attitude control of a quadrotor helicopter via active disturbance rejection control is proposed. Firstly, a model of the quadrotor helicopter is gained by its dynamic equations with pitch, roll and yaw axis. Then the active disturbance rejection controller is introduced, which is used to design the control system. The control system consists of PID controller in inner-loop and ADRC controller in outer-loop. Disturbances and uncertainties can be compensated by the ADRC to achieve smaller tracking error. Finally, the simulation results of the four-rotor helicopter validate the efficiency and self-repairing capability of the proposed control algorithm, compared with that of the PID control and the separate ADRC control.
Relationship between Controllable Process Parameters on Bump Height in ENIG
Authors: Sauli Zaliman , Retnasamy Vithyacharan , Fuad Fairul Afzal Ahmad , Ehkan Phaklen , Ab Aziz Muhamad Hafiz
Published: September 2013

This paper reports the factors that affect the bump height in electroless nickel immersion gold (ENIG) and their interrelation between each other. Bump height is a critical issue that needs to be investigated because a certain quality and requirements of bump height needs to be achieved prior to reflow oven soldering process. A total of four controllable process variables, with 16 sets of experiments were studied using a systematically designed design of experiment (DOE). The result suggests that the electroless nickel bath time has the most significant effect on the formation on bump height and consequently provide larger area for conductivity.
A Comprehensive Approach of Advanced Error Troubleshooting in Intelligent Manufacturing Systems
Authors: Csokmai Lehel , Moldovan Ovidiu , Tarca Ioan Constantin , Tarca Radu
Published: September 2013

Production systems must be flexible and endowed with techniques and tools allowing an automatic recovery of errors. And so, the subject of error recovery in flexible manufacturing system is always an open issue. The objective of this work consists in proposing a new type of software framework for error troubleshooting in a flexible manufacturing system that is perceived as an Intelligent Space (iSpace). Our framework system is designed to solve the failures in the functioning of the FMS and to generate self-training from previous experience.
RANSAC Feature Based Master-Slave Tracking System for Multi-AGV
Authors: Jiang Li Ping , Zhang Biao , Cao Qi Xin , Leng Chun Tao
Published: September 2013

In order to solve the transportation problem in large aircraft components assembly process, an AGV posture synchronization system is built, which utilizes a two-dimensional laser range finder and adaptive control method. Two-dimensional laser range finder is located in the front of AGV to collect real-time point cloud of environment. After tracking AGV section point cloud, we extract straight lines and turning points using the RANSAC algorithm, and estimate the relative posture accordingly. Then adaptive controller processes the position information to achieve master-slave tracking for multi-AGV. In experiment we used three sets of identical AGV; the average distance error was less than 5mm while the angle error was limited within 0.3 °. The results verified the reliability and practicability of our system, which can meet the requirements for transporting large parts.
Induced Power Aggregation Operators and their Applications in Group Decision Making
Authors: Park Jin Han , Park Jung Mi , Kwun Young Chel , Koo Ja Hong
Published: September 2013

The power ordered weighted average (POWA) operator and the power ordered weighted geometric (POWG) operator are the two nonlinear weighted average aggregation tools whose weighting vectors depend on their input arguments. In this paper, as a more general type of POWA and POWG operators, respectively, we develop two induced power aggregation operators called the induced POWA (IPOWA) operator and the induced POWG (IPOWG) operator, respectively, and establish various properties of these induced power aggregation operators, and then apply them, respectively, to develop an approach to multiple attribute group decision making.
On Reliability Study of a New Generation of Crane Controllers
Authors: Liu Xiang Chong , Liu Yun Tao
Published: September 2013

A new generation of crane controllers with higher reliability and controllability is designed compared with present home and abroad crane controllers. Its power unit is isolated from the control unit with optical fibers. It has two layers of power isolation. The voltage value of input signals is raised. The interference resisting capability is raised by replacing transistor circuits with PWM firing technology. There are six control points to control brakes. Besides, the control system reliability and performance are enhanced by superseding mere PID control with combination of PID control and stator current close loop. Tests proved the effectiveness.
Research and Design of Intelligent Library System Based on RFID
Authors: Xie Hong Yu
Published: September 2013

The 21st century is the era of information technology. The library should follow the development of the times in this unprecedented wave of information technology as soon as possible to the digital library excessive. Digital libraries can provide readers with a faster, more efficient service, it better dissemination of scientific and cultural knowledge. In this context, we study and design of an intelligent library system based on RFID, it will point out a direction for the future development of the library. On the basis of a detailed study on RFID technology, a smart digital model of the library is proposed and a specific design method is given.
Application of Rapid Prototyping Technology in Intelligent Optimization Design Area
Authors: Novakova-Marcincinova Ludmila , Novak-Marcincin Jozef
Published: September 2013

Rapid Prototyping (RP) can be defined as a group of techniques used to quickly fabricate a scale model of a part or assembly using three-dimensional Computer Aided Design (CAD) data. What is commonly considered to be the first Rapid Prototyping technique, Stereolithography was developed by 3D Systems of Valencia, CA, USA. The company was founded in 1986, and since then, a number of different Rapid Prototyping techniques have become available. In paper are presented possibilities of Rapid Prototyping application in area of intelligent optimization design.
Infiltration Time Effects of Compressibility of Cement Soil
Authors: Chen Si Li , Dong Kai He , Shi Jian Jun , Yu Tao , Huang Jie
Published: September 2013

Based on the safety and durability in the cement soil engineering about the pits anti-seepage, embankment impermeable walls and subgrade strengthening in the frozen regions and the retaining walls in foundation pits, the experiments on the compressibility about the cement soil under freezing-thawing cycle, infiltrated and other environmental-action conditions have been carried out and the influential laws of environmental actions on the compression parameter of cement soil have been obtained. The results show that the various environmental actions may have influences on compressibility of cement soil at different levels, and the environmental effects on the compressibility of cement soil in the engineering applications and designs, such as impermeable walls or in the frozen regions, should be taken into account; and the void ratio and the compression parameter will increase with the increase of freezing-thawing cycle times and infiltration time but the compression modulus will decrease with the increase of freezing-thawing cycle times and infiltration time so that the curve regression equation about the void ratio, the compression parameter and compression modulus varying with the freezing-thawing cycle times and the infiltration time has been established. The results are significant and valuable to the safety and the durability of cement soil engineering.
Study on a Large-Span Steel Truss Roof Isolation Bearings for Wind Load Effect Isolation Effect
Authors: Fang Zi Fen , Zhang Zhi Qiang , Liu Fei
Published: September 2013

The isolation of large-span Steel Truss Roof structure is developed on the basis of base isolation. The isolation of large-span Steel Truss Roof structure is to limit the transmission of wind load effect to the substructure. Based on the engineering background, we mainly discuss using rubber bearing isolation structure wind load effects. This paper will explains and demonstrates the isolation mechanism of Large-span Steel Truss Structure,and than test and verify isolation effect by Calculating through the analysis of wind tunnel tests conducted on the Yancheng financial services center, which the steel truss roof isolation bearings for wind load effect isolation effect.
Nonlinear Seismic Response Analysis of RAC Space Frame Structure
Authors: Wang Chang Qing
Published: September 2013

An OpenSees computational platform-based 3-dimentional space RAC finite element model is established for reproducing the seismic response of a 1/4 scaled 6-story, 2-bay and 2-span RAC frame model regular in elevation that was tested on shaking table under a series of one-dimensional base excitations with gradually increasing acceleration amplitudes. The dynamic characteristic parameters of the numerical model, including natural frequencies and vibration modes are captured by performed modal analysis. The acceleration response, the maximum storey displacements and the inter-storey drifts are carefully predicted by performed dynamic time history analysis. Very satisfactory agreement between experimental and analytical results is observed. The numerical simulation verifies that the beam-column element type, the section model, the confined concrete model, the steel material model, and the numerical methods used for the proposed model are reasonable.
Slope Stability Evaluation by the Improved AHP and Extenics Theory
Authors: Liu Guo Song , Qi Chun Ming , Nie Chun Long , Hu Jie
Published: September 2013

According to the improved 3 scales (0, 1, 2) Analytic Hierarchy Process (E-AHP) and Extenics theory, an evaluation model is built to evaluate the slope stability. The model takes into account nine indexes that affect the slope stability. The classical matter element and extensional matter elemen are established by collectting actural data. And combined with the specific example, this model accurately calculated the stability state of the slope. The results shown that it not only can take advantage of Extenics Matter-Element theory and the correlation function to study the relationship between index and slope stability, but also can avoid the shortcomings of the traditional AHP judgment matrix inconsistent. It is a new model to evaluate the slope stability.
Application of Acoustic Emission Tomography Technique in Concrete
Authors: Cheng Yan , Hagan Paul , Mitra Rudrajit
Published: September 2013

This paper discusses the development of acoustic emission tomography to identify structural discontinuities in concrete. An algorithm was developed to reconstruct velocity tomographs of the interior of the material. Both theoretical analysis and experimental data were used to determine best sensor array geometry. Experiments on a concrete block with artificial fracture indicate that the technique can be used to identify structural discontinuities.
The Finite Element Analysis of Tower Crane Safety Performance
Authors: Chen Chi , Lu Tian , Chen Hao Yuan , Tian Li Cheng
Published: September 2013

Taking QTZ630 tower crane as the research object, this thesis will use parameter language APDL of finite element analysis software ANSYS direct modeling. Then set the basic parameters of the material, mesh, and finally conduct static analysis. Combining the actual situation, the normal operation of tower cranes in three different conditions of deformation and internal force is analyzed, the results show that three conditions of the maximum displacement and stress values to meet the design requirements specification and there is still a material balance itself.
Experimental Study on Hysteretic Performance of Steel Frame with Improved Node
Authors: Yang Song Sen , Wang Yan
Published: September 2013

Using the test and finite element analysis methods study the load-displacement hysteretic performance of the widened beam flange connections steel frame under the low cyclic load. Results of the research show that under the low cyclic load, the plastic hinge of steel frame with widen beam flange connections can be moved out of the beam-column connection welding. And the centers of plastic hinge locate out of widened arc part, achieving the ductile design goals that avoid the brittle break near the welding seam at the end of the beam. The bearing capacity of the steel frame with widen beam flange connections has been improved, but the stiffness of the column web domain is relatively lower. So construction measures should be taken to reinforcing the column web domain.
The Characteristics and Development Status of the Push-Extend Multi-under-Reamed Concrete Pour Pile
Authors: Qian Yong Mei , Wang Ruo Zhu , Yu Han
Published: September 2013

The article mainly introduces the concept, pile-body construction forms and characteristics of the push-extend multi-under-reamed, and it inquires into the development status and achievements of the pile at home and abroad. A reference will to be provided for further research of this type of pile.
Time-Frequency Characteristic and Recognition Technology of Acoustic Emission Generated from Rock Brittle Fracture
Authors: Liu Jian Wei , Wu Xian Zhen , Liu Xiang Xin
Published: September 2013

To the instability of acoustic emission (AE) signal of rock fracture, the method about feature extraction and comprehensive recognition of those was came up with combining AE parameters, EMD and BP neural network. Through the acoustic emission experiment of different brittle rock under uniaxial compression, stress-strain curve and AE data were obtained; time-frequency characteristics of AE signal of rock samples were compared. Feature vectors, like AE parameters, and EMD energy entropy, was synthesized to BP neural network to distinguish different AE signal. The results show that evolution characteristic with stress or time of AE parameters of different rock which was under uniaxial compression exist similarities and differences. EMD and Welch spectrum can reflect the difference among spectrum, energy distribution of AE signal of different rock very well. With various characteristics of different rock acoustic emission, the neural network has good recognition effect.
An Analytical Solution for Consolidation of Soilbag with Semi-Pervious Boundary and the Comparison between Semi-Previous Boundary and Impervious Boundary
Authors: Niu Ben , Tang Xiao Wu , Zhang Chao Jie , Chen Xiu Liang
Published: September 2013

A new method that is to use soilbag filled with sludge instead of using jackstone has been proposed to construct the sea wall recently. With this new method, expenses of building the sea wall can be cut down and environment pollution around the sea wall can be reduced. An analytical solution for soilbag with semi-pervious boundary is proposed in this study. The cross-section of the soilbag in this theory is considered as a rectangle. By setting coefficients for consolidation solution of two square areas and summing the two parts, final solution of the rectangular area is obtained. Further research is made to compare calculation results from this study and other three methods. After the comparison, it concludes that calculation results from this study are very close with that of finite-element method, and also, the soilbag method possesses a giant economic benefit and has a possibility to replace the jackstone method to construct a sea wall.
Causes Analysis and Control Measures of Leakage of Light Steel Roof
Authors: Gao Qing Min , Liu Huan
Published: September 2013

According to the building,s light steel roof leaking phenomenon, the main potential cause and harm of leakage of the building structure are analyzed. Based on the principle of roof water leakage and waterproof cracking mechanism, combined with the engineering practice, the design principle and control measures of roof water leakage are put forward.
A Brief Discussion on Investment Control of Subway Construction Projects - Taking the Hangzhou Subway Project as the Example
Authors: Zhang Qiang Qiang , Lao Yi , Huang Ling
Published: September 2013

Through the elaboration of the management towards the whole process of preliminary feasibility demonstration, planning of design, construction process and completion settlement about Hangzhou subway construction project, the paper summarizes and analyzes the conditions of subway construction project in the aspect of investment control management, in addition to the analysis of the reasons for some problems occurred and finally puts forward some measures and suggestions to improve the investment control management of subway construction project with an aim to enhance the ability of investment control management towards the subway construction projects in Hangzhou and other domestic regions.
Research of Safe Distance between Concealed Karst Cave and Tunnel
Authors: Lai Yong Biao , Qiao Chun Sheng , Bai Chen Guang
Published: September 2013

Based on the catastrophe theory, a research method of safe distance between concealed karst cave and tunnel is put forward. The stability of rock stratum between concealed karst cave and tunnel is evaluated by the catastrophe theory, the catastrophe mode of rock strata system destabilization is established through the research of rock stratum total potential energy between karst cave and tunnel, then the safe distance calculation formula between concealed karst cave and tunnel are deduced, which is veried by an engineering example.
Time Series Analysis of Slope Displacement Using Neural Network Method
Authors: Zhang Zhi Qiang , Wen Yan Liang , Zhang Guo Jian , Chang Lai Shan
Published: September 2013

Based on the artificial neural network theory, a neural network approach is proposed for the analysis of slope displacement time series, the neural network system analysis of slope displacement time series is developed, it is proved that this method is scientific and reasonable.
Development of Computer Decision Support System for Underwater Positioning in Submarine Immersed Tube Tunnel Construction
Authors: Peng Lei
Published: September 2013

It’s difficult to perform underwater positioning for submarine immersed tube tunnel construction in deep water and torrent condition due to the complex underwater environment and absence of traditional survey method, we developed a 3D computer aided construction application with assistance of advanced measurement equipment. A laser aiming equipment is also utilized to acquire the subtle offset caused by the current flow. This paper described design and development of the data communication, core calculation model,display model and auxiliary tool model in detail, and also shows how they are utilized during the submarine immersed tube tunnel construction.
Model Test of the Impact of Active Ground Fissures on Metro Tunnel
Authors: Yuan Yi , Huang Qiang Bing , Han Jie , Li Ming Li
Published: September 2013

A model test was performed to investigate the impact of active ground fissure on metro tunnel. The test results show that under the action of active ground fissure, the metro tunnel behaviors as a cantilever elastic foundation beam, and the top is in tension and its bottom is in compression. The tensile parts are located in the foot-wall with the range 0.75～2.33D（D is tunnel diameter） distance from active ground fissure and the compressive parts are mainly located in the foot-wall with the range 3D distance from the fissure. When the settlement of hanging wall of ground fissure reaches 1cm（25cm in prototype）, the tunnel bottom appear cavity in the hanging wall and cracks in the foot-wall. With the settlement development of the hanging wall of active ground fissure the vertical soil pressure on the top of tunnel greatly increases and reduces at the bottom of tunnel in the hanging wall.
Comparative Study on Calculation Model of Hydraulic Tunnel Lining Structure between Beam Element and Solid Element
Authors: Zhang Jing Jing , Deng Jun , Zhang Kai , Huang Cheng
Published: September 2013

According to the standard Specification for Design of Hydraulic Tunnels (DL/T 5195-2004), the free-flow tunnel lining structure should be calculated with beam element of finite element method that based on structural mechanics. However, the practical calculation shows that when the lining structure reaches a certain thickness, the beam element calculation results are no longer accurate. Combining with the engineering example, stress and internal force of lining structure with different thickness were calculated by using beam3 beam element and the solid65 element respectively in frame beam analysis. Differences analysis shows that the solid element is better than beam element in calculation. The influence of solid elements grid size on the result accuracy was conducted, and used to amend the calculation result of the solid element, which provides a certain reference on choosing the right element in the similar projects or structure simulation.
From the Viewpoint of Water-Sediment Characters to Approach the General Criteria for Waterway Regulating with Complex Shoals
Authors: Liu Zhao Cun , Fan Wei Jia , Qin Yao Chen , Yan Wei Yang
Published: September 2013

Compared with each other of existed schemes and effects of the waterway regulating with complex shoals, from the viewpoint of water-sediment interacting evolutional properties and their effects on complex shoals of waterway, the results show that, the evolutional processes of channel morphology observe the principles of maximum entropy in equilibrium state and minimum entropy production rate in non-equilibrium state, in energy words, it is the minimum energy dissipation rate. The vortex moving dominates the sediment transport. From the practical engineering viewpoint, the general criteria for waterway regulating with complex shoals were investigated, the results may be valuable to regulating study of the mountain rivers.
Application of a Nonlinear Elliptic Mild Slope Equation in Rizhao Harbor
Authors: Zheng Jun , Li Rui Jie , Jiang Sen Hui
Published: September 2013

A nonlinear elliptic mild slope equation was used to simulate the wave transformation in the water of Rizhao harbor. The model is well suited to complex domain, and fits the irregular boundary conveniently. When the incident direction of wave is E, the mooring condition of harbor entrance is poor, and when the incident direction is SE, the wave hights are relatively great in the inside harbor basin. In wave numerical simulation, the physical phenomenon of wave transformation including wave diffraction, refraction and reflection can be shown obviously. The results show that the model could be used on relative large region and get ideal results.
Orthogonal Test Analysis on Influencing Factors of Prestressed Concrete Small Box Beam Camber
Authors: Zhang Yue
Published: September 2013

Focused on the problems of prefabricated prestressed concrete small box beams cambering at mid-span, FEM theory and orthogonal test method are applied to analyze the sensitivity of factors involving elastic modulus of concrete (E), effective prestressed force (P), environmental relative humidity (RH), beam-preserving time (T) etc, and approximate expressions for calculating camber of the prestressed concrete small box beam are obtained by stepwise regression method. The fitting precision can meet the requirements of the engineering design, and the study method can provide reference for prediction and control of main beam camber.
An Alignment Control Method of Continuous Beam Bridge
Authors: Liu Zhi Feng , Liu Yu Xiang , Xia Yan
Published: September 2013

By directing at the current situation of excessive midspan deflection in prestressed concrete continuous bridge during the past few years, this paper raised a calculation method to elevate the pre-camber. Factors that affect bridge alignment after the bridge is completed were treated as uniform load, test data about the existing bridge were set as the basis, quartic polynomial function was adopted to fit the pre-camber of bridge under construction, and the following conclusions were gained through simulation analysis on the bridge: 1) During calculation for construction pre-camber, this method can overcome or weaken the situation of excessive midspan deflection when the bridge is at operation stage; 2) It can reduce detail analysis on displacement caused by concrete creep and automobile load after the bridge is completed; 3) Relevant parameters are introduced to calculate predicted value of midspan deflection and make calculation for empirical pre-camber more rigorous; 4) Its feasibility has been verified through calculation to guarantee load carrying safety in bridge construction and operation process, so it has relatively high promotion and application values.
Dynamic Characteristics of Pylon of Cable-Stayed Bridge with Inclined and Arched Tower during Construction
Authors: Li Zi Lin , Xue Jiang
Published: September 2013

The structure of cable-stayed bridge with inclined and arched tower is complex and the force is complicated, especially the pylon, whose design and construction require detailed calculation and analysis. In case of the construction of Datong Nansanhuan Yuhe bridge project, in order to ensure the safety during its construction, the detailed construction plan was planned and the finite element model was established to analyse the dynamic performance of structure during construction of pylon. The result shows that, during the construction of low pylon, each frequency order of bridge structure is reduced to a steady level with the pylon completed gradually, and the low frequency changes moderately.
Different Types of Materials Used for Stone Column
Authors: Mohamad Ismail Mohd Ashraf , Ng Lye Khong , Yee Hooi Min
Published: September 2013

The degree of improvement of a soft soil by stone column is due to the inclusion of a stiffer column material and the densification of the surrounding soft soil during the installation of the vibrocompacted stone column itself and the subsequent consolidation process occurring in the soft soil before the final loading of improved soil. Research study on different materials for stone column has not attracted much attention. A systematic verification of the effectiveness of different materials for stone column need to be carried out. It is an important output to be presented as a general guidelines for the selection of proper stone column material which can be used effectively and economically.
Risk Identification in Bridge Construction Stage Based on Fuzzy Hierarchy Analysis
Authors: Liang Xiao Fei , Liu Yu Xin , Xu Yue
Published: September 2013

Due to the characteristic of ordinal consistency in the analytical hierarchy process (AHP) difficult to meet, the method combined AHP and the theory of fuzzy mathematics is introduced, the idea of fuzzy analytic hierarchy process is introduced innovatively. The failure mode and the main factor of failure induced during construction of bridge engineering are identified. The method can exert the brain advantage of evaluation, and simplify the computation process.
Modal Parameters Identification of Bridge Structure Based on Excitation of Wind Load
Authors: Jiang Hao , Meng Guang Wei , Xiong Bao Wei
Published: September 2013

Applying the combination of the natural excitation technique and the Eigen system realization algorithm, a finite element numerical simulation was performed for the dynamic behavior identification of a pre-stressed concrete continuous beam bridge under simulating wind load excitation. The results were validated comparatively using the combined algorithm of random decrement technique and Ibrahim time domain technique as well as the finite element modal analysis. The simulation results show that the wind load as the most common environmental excitation can be used effectively to identify the modal parameters of the concrete bridge.
Mechanical Properties and Design Consideration of Skewed Simple Supported Bridge
Authors: Wang Ning , Wu Bing
Published: September 2013

Due to the special geometry at the ends, skewed bridges are different from squared bridges. There are not lines about it in the code. Ansys is used to achieve the mechanical properties of the skewed bridges. Both static loading and moving loading were placed. It shows that the skewed bridges have unsymmetrical shear force at ends of each girder and the reaction at support with acute angle is larger than that at obtuse angle; with vertical loading, torsion exists in the girders except for flexure moment. Special consideration in bearing design is suggested.
Application of Exact Element-Method on Calculation of Form-Finding and Unstressed Length of Cable
Authors: Li Zhou , Wei Yuan Cheng , Wang Rong Hui , Li Jia Lun , Zhang Peng
Published: September 2013

The problem of form-finding for the suspended cable is actually the problem of determining all key points coordinates on main cable, which are by equilibrium relation on the horizontal force, main cable sagitta and lifting point force under the precondition of determining the endpoints boundary conditions of cable segment. According from the static equilibrium relationship of cable element, based on the analysis of its analytical solution process, in this paper, the cable elements are divided into two types in accordance withthe vertical distribution load along the arc length and along the string length , the corresponding shape curve of cable element is the parabola and the catenary, and with parabolic results as its initial value for the iteration of nonlinear solution, then cable element eventually converge for the catenary. And based on the exact coordinates results ,the calculation method of the length without stress is presented,and compiled corresponding computational procedures. By comparing the results of form-finding and the cable-length in non-stress according to program compiled and the results from the finite element software and the measured value of Aizhai suspension bridge, compared with the nonlinear finite element method,it confirmed the method requireing smaller dividing element density, the convergence speed is quicker and the results can ensure the precision.
Relationship of Cable Tension and Temperature Based on Long-Term Monitoring Data on the Cable-Stayed Bridge
Authors: Wang Xiu Yong , Chen Mao Sheng , Sun Hong Xin , Yang Qi
Published: September 2013

Based on the Jiujiang Bridge Structural Health Monitoring System, lots of data of cable tension and temperature have been acquired. The preliminary analysis of the cable tension and the corresponding temperature shows that there is a long-term growth trend for the cable tension, and exists a certain correlation between the cable tension and the temperature. Using linear fitting method, the growth trend term of the cable tension and the correlation between the cable tension and the temperature of the typical cable are analyzed rationally. By getting rid of the long-term growth trend term and the influence of temperature for the cable tension, the early warning limit of the cable tension state evaluation is determined.