bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on Identifying Surface Quality of Work Pieces Based on Texture Analysis
Authors: Wang Wei Wei , Hu Dong
Published: October 2012

In order to recognize the integrity of workpiece surface texture, this paper introduces the method of mended texture spectrum based on workpiece surface texture. The workpiece surface texture images can be described based on analyzing the influence of cutting parameters on the surface texture. The experimental results indicate that the cutting parameters have a great effect on the integrity of workpiece surface texture. In other words, the effect of cutting speed is evident, that of feed speed, depth of cut to a less extent. In addition, the integrity of texture changes greatly in short time with the increase of cutting parameters.
Impact Characteristics Study on Electromagnet Magnetic Isolation Ring to Electromagnetic Force
Authors: Cao Jian Nan , Liu Jun , Yang Yong
Published: October 2012

This paper makes simulation analysis on an electromagnetic valve product based on ANSYS software by changing the angle, position, length and permeability of electromagnet magnetic isolation ring, and get different electromagnetic force curves. According to electromagnetic force curves, it can verify the importance of magnetic isolation ring’s existence. Comparing simulation results curve with measured electromagnetic force curve, it can find that Attenuation trend of two curves are consistent, which can prove the reliability of simulation by ANSYS software. This study makes a series of electromagnetic force simulation by changing the angle, relative position, and length of magnetic isolation ring. The results show that the influence of relative position’s change to electromagnetic force is more obvious than other factors. The conclusion can be taken as reference by electromagnetic valve designers. Furthermore, there exists important application value in this series of electromagnetic valve optimal design process.
The Dynamic Analysis of the Tennis Racket with the Ball Impact in the Different Area
Authors: Chiu Yi Jui , Yang Chia Hao
Published: October 2012

Have a large population because of being engaged in tennis, impact in ball and bat in the energy transfer produced, only some energy is changed into the kinetic energy that the ball rebounded, other energy will be consumed in the vibration of the ball, network thread and frame, among them the arm that the vibration of the frame certainly will be held bat by the human body is absorbed, load to cause arm produce tired to injure, certainly will absorb through bat transmission of bar by human body even, excessive load, cause arm weariness and strain, it is thereupon production to injure, probing into the vibration quality of bat becomes the very urgent theme, so this text aims at studying and striking the regional impact on vibration characteristic of tennis racket differently. Research this through experiment analytic approach, by accelerate rule amount of instrument and equipment waited for examine different to bump into area hold bat, take things vibration energy parameter on bat. This research obtains the important conclusion as follows: 1. In the impacting experiment of tennis racket, include driving board mode and node bending mode. 2. The natural frequency between 117Hz and 127Hz, amplitude and bending type that produce its have extensive, influence to arm. 3. The impacting area on the throat area, the vibration energy that the arm bears is biggest, secondly for the side area next for the tip area, it is the sweet district is minimum, so try not to deviate from the sweet districts in the batting area.
An Experimental Study on Working State Recognition of Machine Tools
Authors: Fang Teng Fei , Li Guo Fu , Wang Lei , Li Hong Bin , Guo Wei
Published: October 2012

In order to obtain the real-time working state of machine tools, this experiment extracted the characteristics of machine tools using joint time-frequency analysis and wavelet packet analysis for the total current signal collected, to distinguish which machine is running. First, use joint time-frequency analysis on signal of a single machine to get different characteristics. And find some frequency points with amplitude changing significantly, preparing for the subsequent experiment. Then use wavelet packet analysis on the total signal of more than one machine, finding more obvious characteristics of the different machines with different speeds. Thus it is easy to identify which machine is working. By this experiment, we can save labor, improve efficiency and integrate information in system conveniently.
Design of a New Device for Household Cleaning
Authors: Wang Wei , Li Guo Fu , Chen Jun , Ma Ji Dong
Published: October 2012

The characteristics of traditional vacuum cleaner and automatic cleaning robot are analyzed in the paper. A new device for household cleaning is designed. The device combines leaning mechanism with suction mechanism. It could work only by pushing the cleaning machine. In its working process, the cleaning mechanism cleans larger litters first, and then the acceleration mechanism drives the impeller rotating at a high speed, and thus produces negative pressure to inhale the remaining dust. The device could improve cleaning efficiency. As the dust suction mechanism only needs to inhale dust, the force could be smaller .It will saves power and reduces the noise generated by the vacuum part at the same time.
Study on Dynamic Response Characteristics of Composite Thin-Walled Square Beam Subject to Three-Point Bending
Authors: Zhou Gang Yi , Dong Xin Long , Liu Jun
Published: October 2012

In this paper, the experiment of thin-walled square beam subject to three-point bending by using the self-devised drop-hammer impact was carried out. The mechanical behavior of this thin-walled specimen under impact load was obtained. The process of deformation and the dynamic buckling behaviors of composite square beam were analyzed by mean of simulation technique of finite element using ANSYS/LS-DYNA. The simulation analysis of deformation and crushing force characteristics was in good agreement with the experimental results. Meanwhile, the comparative analysis of percussive force and energy absorbability from composite beam and single beam was performed. It is shown by the investigation that the peak percussive force of such composite beam falls down relative to single beam and it possesses good energy absorbability too. The computed result also shows reducing the thickness of the bottom board of such thin-walled square beam has less of an effect on the energy absorbability.
Finite Element Analysis of Load Capacity on Coupling Clamps for Pipe
Authors: Hou Zhen Ning , Wu Jun , Wang Qing , Tian Hong Gen , Chao Nan , Zhou Bo
Published: October 2012

A finite element approach based on Ansys is developed to simulate stress intensity distribution in a three dimensional model of coupling clamp joint, which includes ferrules, pipe caps and bolts. The characteristics of stress intensity distributions of coupling clamp joint under strength pressure loading have been studied by means of the non-linear finite element method. The FE model can also predict the clamp quality and tolerances to be expected under different process conditions and define the most effective process parameters to influence the tolerances. The study could give us a better understanding on the mechanism and basis for optimization design of the coupling clamp joint.
Strength Analysis and Optimum Design of Dynamic Compaction Machinery Boom
Authors: Cai Qin , Tong Shui Guang , Yuan Ming Hong , Tang Ning
Published: October 2012

Based on UG NX7.5 and a certain dynamic compaction machinery whole model, strength analysis and optimum design of boom were studied. After determining the dynamic compaction machinery working loads, based on finite element analysis method, by comprehensively considering lifting, unhooking and rated load conditions, the stress and displacement contours were obtained. The error of experimental and calculated values was less than 15%; furthermore by taking into account of the rationality and security of design and manufacture, the structural optimization of boom in lifting and unhooking conditions was studied. By comparing to the original structural, both the stress and displacement performances of the optimized one was greatly improved, with a 6% and 18.6% increase in maximum stress in lifting and unhooking condition respectively, a 3.9% and 5.6% reduction in maximum displacement and a 6.52% reduction in mass.
The Design and Simulation of Vibrate Impact Extrusion Die
Authors: Xing Tong , Feng Xiao Long , Fu Liang
Published: October 2012

As conventional technique of cold extruding process face the problems that the equipment must provide large extrusion force during the workpiece extruding process, it has huge flow stress of the material and the frictional force between the mould and blank against the material flow under room temperature. To solve these problems, this article put forward a cold extruding mould with vibration. By simulation analysis of conventional and vibration of cold extrusion of travel load and velocity field, the force of vibration extrusion is reduced by 54% than that of conventional cold extrusion; therefore the forming surface of the parts and the material flow speed of vibration cold extrusion is greatly improved
The Safety Design of Electromechanical Products
Authors: Zhuang De Hong
Published: October 2012

Along with the rapid development of science and technology, the safety of electromechanical products caught our more and more attention. Combining the factors of human and object in the design, this paper puts forward the safety design methods of electromechanical products, including designing the reliable products system, preventing incorrect operation design, creating the safety and pleasant interaction mode and the color and so on. It provides general safety design principle and method for electromechanical products, in order to prevent and reduce the accidents, to create the safe working conditions for users, and to ensure that the modern production runs smoothly.
Research of Following Strategy of Product Design
Authors: Xie Zhi Bin , Bu Zhi Qiang
Published: October 2012

The article uses research ways of Enterprise localization and enterprise's development course to study the strategy of company's product design and development. It announces at different stages for development, different kinds of enterprises will adopt product design and development policies of different modes. It also announces close causality between development course of company and central technology and product. The result indicated enterprises in leading position in market, technology and brand adopt pioneer strategy type of product research and development. Those enterprises that are relied on the large-scale leading enterprise offering a complete set service adopt the passively duplicating type tactic of product research and development. Some enterprises with part of advantage in technology, market, management or brand adopt following up strategy of product research and development. The enterprises with relative advantage position adopt the strategy of technology taking optimizing services as centre in product research and development in fields of brand culture and market service.
Integration of Heterogeneous Product Information for Industrial Cluster
Authors: Yu Jun He , Zhan Hong Fei
Published: October 2012

This paper analyzed the heterogeneous product information for industrial cluster. It plays an important role in collaboration of enterprise and product information inquires in industrial cluster. The paper presented globe product data model based on PLIB standard. The globe classification structure and properties definition were given as the globe ontology for industrial cluster. The product class was expressed by general model class and function model class. The class is defined with the properties. The class and properties for injection machine were described as an example. According to the globe product data model, the integration framework can make the integration of heterogeneous product information and provide the unique inquire interface for the end customer. The integration framework was presented and analyzed.
Amenity Design of Blackboard Eraser
Authors: Li Chuan Zhi , Xu Zhong Chao , Ruan Liang Jun , Cheng Xiao Min
Published: October 2012

According to the problem that chalks will create dust, coming up with the idea of electronic blackboard erasers. When wool felt wiping off the writing, micro-motor drives fan to rotate. It eliminates air and form a great pressure to outside, dirt and dust are drawn into the machine by suction. Through filtering, dusts will be collected into a special dust collector. After testing, more than 95% of dusts can be drawn into electronic blackboard eraser. It has a powerful ability to remove dusts.
Improved Methods of QC for Small and Medium-Sized Manufacturing Enterprises
Authors: Guo Wei , Li Guo Fu , Liu Ying Xuan , Liu Lan Lan
Published: October 2012

The methods of QC have significant effects on SMEs’ product quality and may influence the development of the majority of SMEs. In recent years, the principal problems concerning QC for SMEs are that the methods are inefficient and in low degree of application, the workers are not rigorous enough toward self-checking or cross-checking etc. These cause many problems such as the enhanced randomness of product quality problem and the increased working load of quality inspectors, and finally lead to the decrease of enterprise’s quality assurance ability. After analyzing the main problems in SMEs’ QC and their causal factors, the standard method of QC is discussed. Measures such as providing technology support, clarifying responsibilities, establishing the rapid feedback system and improving the visual management of QC are proposed to improve the low application efficiency of QC methods adopted in SMEs and increase the QC effect on the whole process of production.
Research on Knowledge Resource Allocation Oriented Business Process Modeling
Authors: Chen Lei , Zhan Hong Fei , Yu Jun He , Jiang Zhong Ren , Lei Chen Jian
Published: October 2012

Business processes existed in every stage of the product life cycle. A lot of knowledge resources were carried in the business processes. The main purpose of business process modeling was to manage knowledge resources. It laid the foundations for the allocation of knowledge resources. To solve the problems of uncertainty and complexity of the management of knowledge resources, this paper studied the modeling form of knowledge resource allocation oriented business process and discussed the integration mode of knowledge resource and the business process. After the modeling process, the business process models were described from business logic relation, scope, time, cost, standard, material resources, tool and human resource. The relating knowledge resource was also determined during the modeling process, which would be used for the allocation of knowledge resources.
A DSM-Based Multiple-Domain Modeling of Product Information
Authors: Zhang Zhi Chuang , Hu Xiao Ping , Xi Chang Qing
Published: October 2012

Knowledge cannot be promptly shared is the main problem in current ship design processes. Knowledge sharing depended on complete expression of the product information. Therefore, the project management tool—design structure matrix was applied in ship design. Three domains of design structure matrixes including products, tasks and people were built; three domain mapping matrixes which contain each two of the three fields were built too; finally the multiple-domain matrix including these three domains were built. The models established the theory basis for the development of collaborative design prototype system.
Development and Current Status of Multi-Level Converter
Authors: Xie Yan , Chen Bo Chao , Chen Yao Jun
Published: October 2012

The multi-level converter is one of the focuses in the current high-voltage high-power field of power conversion, and is found widely application in high power drive system. It generated so far for nearly three decades of history. During this period a large number of multi-level topology appeared, there are three most commonly used, which are diode clamped, capacitor and cascaded H-bridge. In this paper, the development of the multi-level converter is reviewed. The structure of three multi-level converter topologies are given, and then their advantages and disadvantages are given by analyzing and comparing their characteristics. Finally, a new modular multi-level converter (MMC) is introduced which is one of research focus of multi-level converter field at present. Its structure and working principle are described in detail. Multi-level converters will continue to be developed to meet the demand of high-voltage and high power applications.
Study on Optimizing Collaborative Manufacturing Chain
Authors: Cheng Fang Qi , Wu Hao
Published: October 2012

For realizing the sharing and optimization deployment of the manufacturing resources, the concept of collaborative manufacturing chain is proposed. For acquiring the optimal collaborative manufacturing chain, a multi-objective optimization model is developed to minimize the comprehensive cost and the whole production load with time-sequence constraint. The simulation results indicate that the proposed model and algorithm are able to obtain satisfactory solutions.
Application Research of the Signal Processing Method Based on Db5 Wavelet Transform in Leakage Location of Ship Pipeline
Authors: Peng Zhong Bo , Liu Yue Chong , Han Xue Feng
Published: October 2012

In the complex ship noise environment, the effective signal should be extracted before the leakage signals of acquisition which often mix with noise signal do further analysis. So the signal processing method based on db5 wavelet transform is put forward. In order to make the signal-to-noise separation and restore the original signal waveform, wavelet de-noising processing is done for the pressure sensors receiving signal. Finally, the negative pressure wave method is used to find leakage location of ship pipeline. The experiment proved that the signal processing method based on db5 wavelet transform is suitable for complex ship noise environment and improves location accuracy.
Investigation on Machinery Control System Based on Fuzzy PID Control Technology
Authors: Luo Kuan
Published: October 2012

This review gives the basic concept、mechanism、and algorithm of automatic controlling theory，puts forward some views for the design of automatic control system，designs a new model for the rotational speed control of the stepping electrical machine.
The Comparison of PID Excitation Controller Stabilizing Terminal Voltage
Authors: Qu Yin Peng , Huang Guan Bin
Published: October 2012

In order to stabilizing terminal voltage of a generator, this paper designs two excitation controller improved from the PID based on nonlinear control and fuzzy control theory. Then, simulation results of three excitation controllers in SIMULINK are compared in different disturbance and faults such as terminal voltage step, mutant Load-shedding, one-circuit broken and three-phase short circuit. Simulation results show that: three excitation controllers achieve the goal that stability of terminal voltage is maintained. And PID +Fuzzy excitation controller has the better robustness than the others.
The Study of Substation Automation and Control Systems
Authors: Ding Xue Feng
Published: October 2012

The power system expansion and improvement of the level of modernization, especially in computer control technology to improve the reliability of the substation control and protection systems security line of economy and availability have become increasingly demanding, with the automation technology computer technology and development of communication technologies, substation automation technology have developed rapidly, many designed by the new principles of the new concept of integrated substation automation system put into operation, to demonstrate its strong vitality, but also to promote the integrated substation automation technology to the rapid diffusion and application, and to become power industry to implement one of the key technological advances.
Research on Direct Tension Control of Underfeed Winder
Authors: Fang Hui , Tang Wei , Meng Yan Jing
Published: October 2012

The paper analyzes the method of direct tension control, provides repaired method of closed loop speed for tension control of underfeed winder, and designs the systematic hardware figuration and software to effectively meet the demands of different volume control. Furthermore, the problems including pressure control of pressing roller, load distribution control of two-drum winder, tension control of paper, and dynamic compensation control were analyzed and solved through the design of hardware and software of S7-300 PLC.
Study of Dynamic Management in Digital Harbor Based on Internet of Things
Authors: Hu Cheng , Du Jiang Yi
Published: October 2012

The business of the harbor expands enormously nowadays and gives new challenge to the harbor management. This paper analyzes the Internet of Things (IOT) based dynamic management system with the correlative key theory and techniques in detail, then proposes the architecture of the digital harbor system and gives the main idea of construction in technique which provides 2D&3D virtual scene to demonstrate the dynamic analysis and forecast the development of harbor.
Study on Underwater Terrain Matching Techniques Based on an Improved PMF Algorithm
Authors: Liu Hong , Gao Yong Qi , Zhang Yi
Published: October 2012

Due to the existence of the accumulation errors in inertial navigation system(INS) and traditional point-mass filter (PMF) algorithm has problems of navigation precision and reliability when it is used for underwater terrain matching navigation, an improved PMF algorithm is proposed. Because the PMF algorithm is sensitive to initial errors and degeneration phenomenon usually appears with the increasing of matching number, the improved algorithm adopts cubic spline interpolation method to deal with the posterior probability density to prevent degeneration phenomenon. Then the TERCOM algorithm is introduced for initial alignment to reduce the influence of the initial errors. Finally the improved algorithm is simulated. The simulation results show the algorithm has a good robustness and accuracy.
A Kind of Minitype 2D Vector Hydrophone
Authors: Ge Qi Qi
Published: October 2012

A special designed 2D accelerometer was successfully used in the design of the minitype 2D vector hydrophone. The theory, design and experiment test data of both the accelerometer and the vector hydrophone was presented in this paper. The accelerometer based on cantilever beam mode and used PZT tube to substitute the PZT plate which was traditional used, this substitution enhanced the mechanical strength of the accelerometer, which resulted to the high performance of the 2D vector hydrophone in its natural frequency and sensitivity. The outside electrode of the PZT tube was divided into four equivalent parts, and each opposite part was wiring connected into one accelerometer channel, thus the two orthotropic accelerometer channels was integrate into one 2D cantilever beam mode accelerometer. The minitype vector hydrophone was designed based on this compact 2D accelerometer, and it’s high performace makes it possible to be used in under water sonar transducer arrays.
Research on Welded Structure Design Technology
Authors: Li Dian Can
Published: October 2012

In recent years, the feature technology has been widely used in CAD/CAPP/CMA design. This essay comprehensively analyzes and studies on the feature definition, description and expression, according to the characteristics of the welded structure design. Welded structure products feature models applicable to the pressure vessels are developed and designed against the product structure features of, welding types of and connector design requirements for the typical welding structure pressure vessels and by combination of the feature technologies. The feature design of the welded structure is studied by the analyzing the welded structures of the pressure vessels. By study on the welded structure design technologies based on features, parametric design technologies can be applied in the development of the welded structure products to effectively shorten the product development circle, improve the product development quality and increase the levels of information technology applied by a firm.
Analysis and Control of Micro-Alloy Steel in Continuous Casting Process
Authors: Hong Xia , Dong Zhong Bo , Yang Zhi Zheng
Published: October 2012

The paper analyzes the precipitation behavior of micro-alloy elements including Nb, V, Ti and its effect to ductility of the steel during thermal deformation process, study on relationship between Nb, C content and slab crack incidence rate, supply countermeasures to control crack incidence rate during continuous casting course from components adjustment and process discipline optimization.
The Study on Electric Power Equipment Reliability Analysis Using Statistical Method
Authors: Zhang Ke , Zheng Yi Bo , Yu Hang Yang
Published: October 2012

This paper gives an overview of selected statistical methods and models commonly used in reliability engineering. The purpose of this paper is to discuss several concepts commonly applied in the analysis of equipment performance and, in particular, in predicting the remaining life of power equipment. Parametric methods are well suited for the prediction of the end of life of electric power equipment. However, care must be taken in selecting appropriate model since vastly different results can be obtained with different models fitted into the same data. Nonparametric methods are useful only when no suitable probability distribution can be fitted into the data set.
Design of Motion Control Card on PXI Bus
Authors: Wang Xiao Kun , Niu Yu Bao , Zhang Li Juan , Feng Feng , Wang Ping
Published: October 2012

The article introduces the design scheme of a motion control card on PXI bus. A detailed description of PCI interface module, FPGA module, DSP module, serial transceiver module and analog acquisition module is also given in this paper. Tests of data transfer rate between host and motion control card are adopted, the results suggest that the PXI local bus can get a high-rate communication. The motion control card is applied to control the two-dimensional turntable of an optoelectronic imaging and tracking system. The experiments indicate that the motion control card based on PXI can meet the requirements of real-time control. The performance of control is also acceptable.
The Application of Virtual Reality Technology in Gymnastics Movement Simulation
Authors: Feng Miao
Published: October 2012

The simulation results and the analysis of 3d body movement is still a difficult and hot issue. Although domestic and international counterparts is in a human body movement simulation has some results but they really difficult to meet demand, because height of the complexity of the calculation, or the need to put heavy parameters. Study the hot topic of object-oriented simulation system simulation method, qualitative simulation, distributed interactive simulation, virtual simulation, the multimedia simulation, simulation based on virtual reality.
Design and Application of an New Wireless Adaptive AP
Authors: Bai Xiao Hui
Published: October 2012

With the wide range of applications of wireless networks, Wireless AP in indoor use of limitation is very big. Reduce the quality of network operation in many cases, This paper analyzes its limitation, put forward several methods to optimize the use of of AP, also put forward a design scheme of an new wireless adaptive AP.
A Survey on Additivity Conjecture
Authors: Dai Xian Hua , Li Hong
Published: October 2012

Quantum material is one emerging branch of advanced materials. Quantum entanglement is one intrinsic property for quantum material, in particular, in quantum communication. Additivity conjecture is a long standing problem for quantum material to transmit information. This note surveys additivity conjecture in some kinds of forms, and introduces some known results including relations between them.
The Vibration of the Raft-Superstructure on the Saturated Soil under Moving Load by Using a Semi-Analysis Method
Authors: Cheng Chun Bo , Xu Man Qing , Xu Bin
Published: October 2012

Based on Biot’s theory and the minimum potential energy principle as well as the thin plate theory, the superstructure, raft and soil are assumed to be a whole system according to the substructure method. The system must satisfy the continuity conditions at the interface between the superstructure, raft and soil surface. Considering the compatibility condition that the vertical displacement of the interface between the raft and the saturated soil should be equal, the integral equation accounting for the vertical coupling of the superstructure-raft system with the saturated soil subjected to a moving load is constructed. Using the numerical inverse transform technique, the forces and displacements of the superstructure, plate and saturated soil at any time are obtained. Some numerical results are presented to demonstrate the capacity of the proposed model. Also, the influence of load velocity on the superstructure will be investigated in this paper.
Effect of Axial Compression Ratio on Ductility and Bearing Capacity of Specially Shaped Columns with HRB500 Reinforcement
Authors: Li Yan Jun , Liu Ping
Published: October 2012

Four specially shaped columns with HRB500 reinforcement were tested under low cyclic loading. The hysteretic curve, yield load, ultimate load, displacement ductility and rigidity degradation were compared in order to research the effect of axial compression ratio on ductility and bearing capacity of specially shaped column with HRB500 reinforcement. It is shown that the axial compression ratio has greater influence on ductility and bearing capacity. With the increase of axial compression ratio, the bearing capacity of HRB500 reinforcement concrete specially shaped column can be enhanced while the deformation capacity becomes worse. The hysteretic characteristic of specially shaped columns with HRB500 reinforcement is improved and the stiffness degeneration becomes slow with the decrease of axial compression ratio.
Nonlinear Analysis of Settlement for Cohesionless Soil Foundations Based on In Situ Tests
Authors: Li Ren Ping , Liu Jie
Published: October 2012

A new technique is proposed to calculate nonlinear settlement for foundation by using the data of plate loading test (PLT) and standard penetration test (SPT) or other in-situ tests. Firstly, hyperbolic curve is fitted out from the data of PLT and the tangent modulus equation of soil is established, then correctional tangent modulus (CTM) equation is established by feedback adjusting according to the fitting curve of PLT; Secondly, the CTM equations of different stratified soil at different depth are determined by soil parameters of SPT or other in-situ tests according to linear correlation; Finally, the nonlinear settlement of foundation is calculated by the layerwise summation method. An engineering application of settlement prediction for the largest oil tank in China indicated that this technique is able to calculate the entire nonlinear settlement from initiation to ultimate limit state and obtain accurate results, and it is suitable for cohesionless soil with high permeability.
Demolition of a Complex Brick-Structure Chimney with a Height of 56 Meters without Recoil by Demolitional Blasting
Authors: Huang Ping , Wang Ning Xiong , Zhou Lan Hua
Published: October 2012

A complex brick-structure chimney with a height of 56 meters was successfully demolished without recoil through directional blasting in complicated environment. Some effective measures that helped control the direction of collapse and avoid recoil were taken in the demolition of brick chimney. The calculation principle and method of blasting cut is elaborated. The blasting is satisfactory.
Study on Reinforced Concrete Masonry High-Rise Building by Abaqus
Authors: Sun Xu Jie , Zhang Hou , Lu Da Gang , Wang Feng Lai
Published: October 2012

Pseudo static tests of 10 specimen made of 290 mm thick reinforced concrete masonry wall were finished, then test results were simulated by ABAQUS which use shell element, pamameters of the materials were defined by the comparison between the calculation results and that of the test. A 100 m high reinforced concrete masonry building in China was analyzed, elastic-plastic deformation check calculation under earthquake action by time-history analysis method were detailed. The story drift of the building is 1/666 for fortification intensity 6 and 1/326 for intensity 7 under strong earthquake, it is feasible.
Arrangement of Cable on Prestressed Cable-Beam Structure System
Authors: Xie Xin Ying , Yin Xin Sheng
Published: October 2012

The article analyzes the prestressed concrete cable-beam structure system when it is on the condition of sigle span and sigle direction.The paper summaries the application of cale and presents the design ideas of cable,arranges reasonably the shape of cable,deduces the equation of cable when it is under the condition of curve,and gets the conclusion. The height of the middle bar decides the height of the cable-beam,so it limits the ratio of sag and span to make the reasonable design in the paper and to embody the superiority of prestressed concrete cable-beam structure system.
The Vibration of Pile Groups Embedded in a Layered Poroelastic Half Space Subjected to Harmonic Axial Loads by Using Integral Equations Method
Authors: Cheng Chun Bo , Xu Man Qing , Xu Bin
Published: October 2012

The dynamic response of a pile group embedded in a layered poroelastic half space subjected to axial harmonic loads is investigated in this study. Based on Biot's theory and utilizing Muki's method, the second kind of Fredholm integral equations describing the dynamic interaction between the layered half space and the pile group is constructed. Numerical results show that in a two-layered half space, for the closely populated pile group with a rigid cap, the upper softer layer thickness has considerably different influence on the center pile and the corner piles, while for sparsely populated pile group, it has almost the same influence on all the piles.
Super High-Rise Building (H =266m) of New Concrete Core Tube and Assembly Integral Spatial Steel Grid Cassette Tube in Tube Hybrid Structure Research and Design
Authors: Ma Ke Jian , Peng Deng , Qin Shi Jie
Published: October 2012

With the development of economy and society, urban construction rose to a new level in China. High-rise and super high-rise building increase rapidly. In the high-rise and super high-rise buildings (H≥150 m), the structural system usually adopts the conventional reinforced concrete, including frame tube structure, tube in tube structure, steel frame with reinforced concrete core tube hybrid structure and tube in tube steel - concrete mixed structure. These traditional structural systems often lead to the problems of fat beam fat column and high expenditure, which is not economic and unfriendly to the environment. This paper not only presents a new type of concrete core wall and prefabricated space steel grid cassette tube in tube structure system, but also discusses the superiority of the new type structure through the innovation and practice of a super high (266 m) five-star hotel and office building integrated engineering construction.
Finite Element Analysis on the Bearing Capacity of Tube-Plate Joint with Different Width-Thickness Ratio
Authors: Yang Jun Fen , Peng Yi Liang , Wei Xia Bing , Cui Jin Bo
Published: October 2012

Tube-plate joint is a frequently-used joint type in steel-tube tower, but the theoretical analysis and experimental investigation on tube-plate joint are absent both at home and abroad. In this paper, the ANSYS finite element program was used to simulate the bearing capacity and deformation condition of tube-plate joint with 1/2-stiffening ring. Eight calculation models were designed, and the width-thickness ratio was changed by changing the width or thickness of stiffening ring. The results indicate that the influence of different width-thickness ratio on tube-plate joint bearing capability is significant. By increasing the width or increasing the thickness of stiffening rings to improve the bearing capacity of the joint is a very effective way.
Theoretical Research on the Debonding of CFST Short Column under Axial Compression
Authors: Su Jun Chen , Wen Ya Nan
Published: October 2012

This article deduced the debonding in the whole process of modification of CFST under axial compression through the spatial elastic incremental theory, then found the debonding conditions and laws of CFST with different sizes and materials, and decided the different design concepts of CFST structures at the elastic working stage and at the ultimate state.
Aanalyse on the Causation and Classification of Usual Damages of Highway Tunnel
Authors: Shang Shi Yu
Published: October 2012

There are long spans and various types of lining of highway tunnels under different geological conditions. It is challenging to obtain accurate geological condition data of tunnel, the existing tunnel design theories and methods are not mature either. Meantime, the stresses of tunnel during the stage of design, construction, operation and maintenance are also changing with time. Therefore, it is difficult to discover the root causes of the highway tunnels defeats, also because of the joint influence of the above factors. Through the broadly investigations of defeats of highway tunnel, the reasons of these defeats was analyzed and classified from four aspects, external forces, design methods, construction phase and deterioration of materials. More important, the general rules and association between the defeats and causes was studied and suggested following the brief introduction of the highway tunnel defeats.
The Dynamic Response Analysis on the Surrounding Ground of Underground Structure
Authors: Zhang Guo Dong , Zhang Jian Long , Cao Jian Long , Luo Wen
Published: October 2012

Based on the theory of soil-structure interaction, the underground structure and surrounding soil as a system, and the finite element analysis model is established, and finite element dynamic analysis method is implemented, the three seismic acceleration time history of the different spectrum characteristics is inputted, the seismic effect on the surrounding ground of underground structure is analyzed. The results show that the effect on dynamic response is the limited range and not significant, when seismic design of structures on the surrounding sites is implemented, additional dynamic response on surrounding sites does not need to consider.
The Measurement of Water Bursting Volume of Jianfeng Mountain Tunnel and Treatment Techniques of Water Bursting
Authors: Huang Jun , Li Guo Ming , Wang Bing , Liu Hong Zhou , Song Rui Gang
Published: October 2012

The measurement of tunnel water inflow is not only an important basis for engineering design changes, but also an effective verification of design. This paper combines with the analysis of the measured data of groundwater of large water inflow section, which appeared in the construction of high-speed Jianfeng mountain super long tunnel in Fuling Fengdu, Chongqing city, and detailed information of hydrological survey results. This paper has re-evaluated the engineering geology and hydro-geological of large gushing sections to clear the reason of water inflow, the development trend characteristics of groundwater and stability of surrounding rock. It is shown in this paper that the measures such as strengthening the support parameters, optimizing the waterproof and drainaging design schemes, and other measures can be adopted to ensure the safety of tunnel construction and effectively realize the concept of dynamic construction.
A Structural Failure Model for the Rock Mass with a Discontinuous Weak Structural Plane
Authors: Chu Xi Hua , Jiang Qing Hui , Wang Bin
Published: October 2012

A structural failure model is presented for the rock mass with a discontinuous weak structural plane. The present model takes into account the effect of weakening of both deformation and strength parameters. And it can degenerates into classical Mohr-Coulomb model or Jaeger model according to corresponding conditions. The numerical tests by Particle Flow Code demonstrate that the capability and performance of the proposed model in capturing behaviors of the mass rock.
Research of New Filling and Mining Technology Using Waste Rocks in Steep Coal Seams
Authors: Zang Chuan Wei , Ma Chuan Le , Zhuang Xue An
Published: October 2012

During the extraction of steeply inclined coal seams, the coal recovery ratio is low be-cause of the coal pillar loss and the production of waste rock is high due to lots of rock roadways which causes serious environmental pollution. This status is conflicted with the strategy of Clean Coal Mining and Green Coal Mining in China, so it is necessary to develop new coal mining method. In this paper, Downward Stratified Gangue Self-filling Method on the Flexible Shield (DSGSMFS) is put forward first. It means that the coal face is lain horizontally and advances along the dip; the flexible shield is used to separate the gob area; the waste rocks are self-filled downward to the top the shield; the coal is broken by drilling and blasting method under the shield, and the broken coal is transported by the electrical winch and the scraping mucker; the flexible shield moves downward automatically by the weight of itself and waste rocks. Field test shows that the strata displacement is effectively controlled by using DSGSMFS, so some coal pillars are recovered; as a result the problem of large quantity gangue and low coal recovery ratio in steep coal seam is solved. DSGSMFS is proved to be a new hopeful and effective coal green mining method.
Studies for Deformation of Slurry Shield Construction under Across and Parallel Existing Tunnel
Authors: Ma Yong Qi , Ning Yin , Dong Yi , Wu Feng Lin
Published: October 2012

The method combining the construction survey and the numerical simulation is proposed in the paper to accurately obtain the deformation of the slurry shield construction under across and parallel existing tunnel. The surface settlements of the engineering construction initial position are surveyed. The reliability of the three dimensional finite element models is verified by comparing with the survey results. The deformation variation of the existing tunnel and ground surface are obtained by the elastoplasticity nonlinear calculations, showing the feasibility and effectiveness of the proposed method and the credibility and accuracy of the calculated results. Meanwhile, the measures of control deformation are presented. The surveyed settlements after the construction process of implementing measures are smaller than those calculated, indicating the effect obviously of the measures which has practical significance.
Analysis of Settlement Control Measures in Immersed Tunnel
Authors: Wei Gang , Qiu Hui Jie , Wei Xin Jiang
Published: October 2012

The long-term uneven settlement may cause the pipe structure cracking, leakage or even serious damage during the operation of the immersed tunnel. Settlement control measures of immersed tunnel were generalized from design-construction-operation three stages as the time order, and the control measures in the construction stage was particular emphasized. The treatment methods of the base layer were reclassified into compact the base, replace the base and pile base three types and relative project cases were enumerated. Contrary to the shortage of present stage, control measures and suggestion that fit soft base were raised after compare.
Study on Construction Technique of Soft Rock Tunnel in Loess Region
Authors: Chen Zhi Qiang , Wang Yi Xin
Published: October 2012

In order to Ganquan tunnel as an example introduced the Loess Tunnel Typical Rocky and appropriate excavation construction technology. Early lining and secondary lining, waterproofing and drainage, and monitoring measurement and advanced geological prediction of key construction processes are described and summarized.
Numerical Prediction of Settlement Adjacent to Deep Excavation of Metro Station in Ju-Zi-Zhou Island, Changsha
Authors: Pan Xing Yu , Fu Hong Yuan
Published: October 2012

It is of great significant to predict the influence of deep excavation in Ju-Zi-Zhou island, so that damage to adjacent ancient tree, and Xiang-jiang Bridge could be prevented. Based on analysis of site condition, geological profile, and strut design, the numerical model was generated in commercial available software package Flac3D, in which Mohr-Coulomb model was introduced. Then, the settlements at several key points on the ground were evaluated in each step of excavation. The calibrated results shows that, the calculated settlement agrees well with the measured. So it can be applied to predict completed state and provide a guidance for next construction.
Theoretical Analysis of Gas and Oil Storage Cavern in Bedded Salt Rock Using a Love Function
Authors: Wang Gui Jun , Xie Peng
Published: October 2012

Based upon the elastic theory, the gas and oil storage cavern in bedded salt rock formation is generalized as a spatially axisymmetric model. A Love function was built from polynomial and logarithmic functions at first, and then solved, considering the gravity, the internal gas and oil pressure of the cavern, the boundary conditions, as well as the continuity conditions at the interface between salt and non-salt media. Finally, the elastic displacement and stress components are achieved which are satisfied to the main boundary and continuity conditions.
Study on Construction Method of Double-Track Tunnel on Passenger Dedicated Line by Numerical Simulation
Authors: Zhang Jian Guo
Published: October 2012

In view of the double-track tunnel on passenger dedicated line with speed 250km/h, finite element programming has been employed to simulate dynamic construction process under shallow-buried and bias conditions with grade IV, including stony and soil, and grade V surrounding rock. Different construction methods under various operation conditions have been compared. Based on stability of surrounding rock and safety of primary and temporary lining, proper construction method under various operation conditions has been presented.
Analysis of Reliability Degree for Primary Support System in Tunnel
Authors: Su Zhong Ming
Published: October 2012

Structure performance function is established with the consideration of safety factor, taking the primary support structure as a series system and determining the invalidation model of the system, and then the internal forces of primary support are expressed by the limit displacement. The calculating analysis also takes material parameters and geometrical dimension into consideration. Based on a typical tunnel, the reliability degree of the whole system is calculated, which indicates that the reliability degree is rather smaller at a certain section of the primary support, but it can satisfy design requires of the whole system, and the tunnel stays in a safety state.