bluuebunny/crossref_metadata_2025 huggingface dataset:
Application of Probabilistic Neural Networks in Fault Diagnosis of Three-Phase Induction Motors
Authors: Ding Shuo , Chang Xiao Heng , Wu Qing Hui
Published: October 2013

In fault diagnosis of three-phase induction motors, traditional methods usually fail because of the complex system of three-phase induction motors. Short circuit is a very common stator fault in all the faults of three-phase induction motors. Probabilistic neural network is a kind of artificial neural network which is widely used due to its fast training and simple structure. In this paper, the diagnosis method based on probabilistic neural network is proposed to deal with stator short circuits. First, the principle and structure of probabilistic neural network is studied in this paper. Second, the method of fault setting and fault feature extraction of three-phase induction motors is proposed on the basis of the fault diagnosis of stator short circuits. Then the establishment of the diagnosis model based on probabilistic neural network is illustrated with details. At last, training and simulation tests are done for the model. And simulation results show that this method is very practical with its high accuracy and fast speed.
Nonlinear Noise Canceller by Neural Network with Variable Step Size
Authors: Zhang Shou Zhong
Published: October 2013

Neural network is acted as noise canceller to implement noise cancel under the condition of interference noise has nonlinear correlation to reference noise. If interference noise has nonlinear correlation to reference noise, the transversal filter has weak effect to cancel the noise in the signal. Neural network has nonlinear characteristic transfer and can solve this problem, and a new variable step size algorithm is proposed to further improve the performance. Computer simulation results show that neural network noise canceller has better signal to noise gain for nonlinear noise.
The Optimal Allocation of Finishing Train in Steel Rolling Based on Improved Genetic Algorithm
Authors: Liu Hong Xia , Chen Xin
Published: October 2013

The central issue of finishing train is that we should distribute the thickness of each exit with reason and determine the rolling force and relative convexity. The optimization methods currently used are empirical distribution method and the load curve method, but they both have drawbacks. To solve those problems we established a mathematical model of the finishing train and introduced an improved Genetic Algorithm. In this algorithm we used real number encoding, selection operator of a roulette and elitist selection and then improved crossover and mutation operators. The results show that the model and algorithm is feasible and could ensure the optimal effect and convergence speed. The products meet the production requirements.
Experimental Vision-Based Target Positioning by PI Micro-Robot
Authors: Song Wei , Liu Xu , Zhang Ya Nan , Shen Lin Yong
Published: October 2013

In Inertia confinement fusion (ICF) physical experiments, target positioning accuracy directly affects the success of target hitting. The proposed positioning method firstly used template matching to extract the target features in image, then calculated the target’s spatial coordinate and rotation matrix by integrating the feature values from three CCDs. We used a PI Hexapods Micro-robot to adjust the target to a desired position. The experiment results show the PI Hexapods Micro-robot is confirmed to be able to adjust the target in a desired position, which verifies the practicality of the proposed positioning algorithm to be used in the real ICF physical experiment.
The Unique Representations of Fuzzy Entropy for a Finite Fuzzy Set
Authors: Qing Ming
Published: October 2013

Many methods were presented to define fuzzy entropy to measure fuzzy degree of a fuzzy set and a variety of fuzzy entropy formulae were derived and constructed from the definitions of fuzzy entropy. In this paper, a new definition of fuzzy entropy is presented based on a simple order relation and computation formulae of fuzzy entropy is given. Then, the unique representations of fuzzy entropy are given by applying several set of reasonable conditions to fuzzy entropy.
Review of Modeling Methods of Gene Expression Regulation Networks
Authors: Zhao Ying Ding , Qiao Xian Xia
Published: October 2013

the study of Gene expression regulation network is expected to fully disclose function and behavior of the genome from the perspective of system. Now, Gene expression regulation network construction methods include Boolean networks, linear combination, the weighted matrix, Bayesian networks and differential equation, And so on, These methods are real abstraction of gene expression regulation network at different levels. Boolean network is qualitative research network of gene expression regulating, And Differential equation is quantified to describe biological processes by detailed mathematical analysis , But the lack of ability to resist noise, Large amount of calculation and poor robust performance. Bayesian network model is a compromise between the two extreme models. construction of gene expression regulation network is the research hotspot of bioinformatics by Bayesian network.
Applied Research on Gene Expression Regulate Network by Complex Network Theory
Authors: Qiao Xian Xia , Zhao Ying Ding
Published: October 2013

The purpose of our research on gene expression regulation network that Is expected to fully disclose the genome from the perspective of system functionality and behavior, In essence, the Gene expression regulation network is a complex network, We study gene expression regulation network by the complex network theory, network properties of Research the network as average path length, Focus coefficient, Degree distribution, Scale-free feature and Small world effect ,etc, the Biological significance of the research is that Trying to complex systems point of view as a starting point , the network topology structure of interaction between them from the Angle of the relationship between genes, proteins, Reveals the complex mechanism and functional information.
Study of Phase Function of the Biological Cell
Authors: Cui Qing Yi , Wang Ya Wei , Bu Min
Published: October 2013

In order to settle the influence of measuring results of cells with its shape-variety in the examination of biological cell, MCEM (modify co-central ellipse model) is adopted based on the theories of Rayleigh-Debye-Gans, and the changing tendency of scattering phase function of nucleated cells with different body factor, nuclear size and shooting angle are studied. These provide a useful theory foundation for improving the measurement and distinguishing of biological cell.
Relative Pose Estimation under Monocular Vision in Rendezvous and Docking
Authors: Pan Hui , Huang Jian Yu , Qin Shi Yin
Published: October 2013

Autonomous rendezvous and docking (ARD) plays a very important role in planned space programs such as on-orbit construction and assembly, refueling of satellites, repairing or rescuing failed satellites, active removal of space debris, autonomous re-supply and crew exchange of space stations, and so on. However,the success of ARD rests with the estimation accuracy and efficiency of relative pose among various spacecraft in rendezvous and docking. In this paper, a high accuracy and efficiency estimation algorithm of relative pose of cooperative space targets is presented based on monocular vision imaging, in which a modified gravity model approach and multiple targets tracking methods are employed to improve the accuracy of feature extraction and enhance the estimation efficiency, moreover the Levenberg-Marquardt method (LMM) is used to achieve a well global convergence. The comprehensive experiment results demonstrate its outstanding predominance in estimation accuracy and efficiency.
Research for Total Nitrogen Detection System Based on Electrochemical Method
Authors: Song Zi Yuan , Bian Chao , Li Yang , Tong Jian Hua , Sun Ji Zhou , Xia Shan Hong
Published: October 2013

This paper presents a total nitrogen (TN) detection system based on electrochemical measurement. This system integrates a three-electrode system and a specially designed detection circuit. The dynamic response characteristic of the three-electrode system during TN electrochemical determination process was studied. The equivalent circuit of the three-electrode system was used to analyze factors of interference and signal instability. Through theoretical derivations and experimental proof, a time-domain model of signal response was established and two main factors, electric double layer capacitor and holding time, were put forward. Smooth and steady signal was achieved by optimizing these two main factors. Water sample of Taihu Lake was detected by this developed TN detection system with acceptable accuracy.
Design and Performance Testing of Proportioning Weighing Instrument Based on Position PID
Authors: Han Ding , Xue Cai Xia , Weng Zhi , Li Li Hong
Published: October 2013

To accomplish the requirement of Coking Coal Company, we design proportioning belt weighing [1] and its instrument; it also can be used in metallurgy and material industries. The instrument controller is comprised of microcontroller, signal processing unit, shaping circuit, real time clock and so on, its program arithmetic adopt integral separation position PID with dead band .the whole proportioning weighing instrument can not only show accumulative value but also adjust the quantity of instantaneous materials. Last, the result of experiment meet fully the GB/T 7724-1999 standard for the proportioning belt weighting instrument displaying controller requirements.
Design and Implementation of Galvanized Groove Detection Electromechanical System
Authors: Liu Jin Qiu , Zhang Bing Fa , Wang Yu Zeng , Han Jing Ru , Li Guang Ya
Published: October 2013

Based on the serial communication between PC and PLC, design and realization of the electrical control system of testing zinc tank inner wall corrosion degree, PLC control ac servo motors to complete inspection equipment XYZ three direction, testing data via the PLC by sensors, then through a serial port to PC, PC complete error analysis, curved surface fitting, etc , realize the internal corrosion degree of detection.
Research on the Law of Time Workshop Temperature an Humidity Reach Standard with Environment
Authors: Xia Yun Fei , Huang Bin , Hou Zheng Zhou , Jia Lin
Published: October 2013

Firstly, through the fishbone diagram and Causal table method to find the factor which effect the time of temperature and humidity reach standard. Secondly, collect various time, temperature and humidity data of every time air conditioning boot, analysis and arrange the data, build the three-dimensional relationship between workshop temperature, humidity and the reach standard time, and fitting, finally, find the regular pattern between environmental factors and the time of temperature and humidity reach standard.
Optimization of Measuring Points Based on the Grey System Theory for Spindle of Machining Center
Authors: Zhao Chang Long , Guan Xue Song
Published: October 2013

To improve processing precision of numerical machine tool ,research on analyze the thermal error of spindle, the grey correlation analysis method is used to optimize the thermal key points to build the model of temperature field on the basis of temperature measurement experiment. By optimizing, the number of temperature measuring points from 8 to 3. In this way, the precision of thermal error model and thermal error prediction can be improved.
MOA Resistive Current On-Line Monitoring and Expert Diagnosis System
Authors: Wu Meng Meng , Xu Jun , Yi Bo
Published: October 2013

This paper presents metal oxide arresters (MOA) resistive current on-line monitoring and expert diagnosis system. The system combined the harmonic analysis method and the compensation method to measure the MOA resistive current. The on-line monitoring system used MAX11046 for signal A/D conversion and TMS320F2812 DSP for data processing. It used IEC 60870-5-103 protocol to upload the data to the expert diagnosis system through the RS-485 bus. Based on the real-time monitoring data, the historical data and the environmental parameters, the expert diagnosis system can analyze and judge the MOA status. The system adopted many anti-jamming measures to make the measurement data stable and accurate. The results show that the resistive current of the 35KV MOA fluctuates based on 20μA.
Design and Performance Evaluation of MR Tactile Device for Medical Application
Authors: Oh Jong Seok , Han Young Min , Choi Seung Bok
Published: October 2013

It is very prevalent in medical industry to adopt robotic technology such as robotic minimally invasive surgery (RMIS). This causes the surgeon not to sense viscosity and stiffness of the tissue or organ. In order to generate the tactile recognition of human organ, this work proposes a novel tactile device using magnetorheological (MR) fluid. The MR fluid is fully inserted into diaphragm and several pins. Due to controllability of rheological properties by the intensity of the magnetic flux density, the operator can feel different force from the proposed tactile device. In order to evaluate the performance of tactile device, two method is proposed. One is to measure the repulsive force with applying several control inputs. The other method is to check the performance of tactile sensation using psychophysical experiments. From these results, the usability of the tactile device is proved.
Experimental Study on Microwave Test of Cold Weld Defects in HDPE Piping Thermal Fusion Welds
Authors: Pan Jin Ping , Zhu Xin Wei , Tan Lian Jiang
Published: October 2013

In this paper, an effective method for detecting the cold weld defects in the thermal fusion weld of high-density polyethylene (HDPE) pipeline based on microwave technique is proposed. Using a microwave testing system, HDPE piping welds were examined in a proper position by frequency sweep within the range of 9.3-9.9 GHz. At a frequency that was most sensitive to the cold weld defects, the measured reflection coefficient S11 exhibited significantly different values between the good weld and those containing cold weld defects. The readily detectable differences in S11 value make identification of the cold weld defects possible. This work provides a basis for inspection of defects in HDPE piping welds.
Multi-Level Fuzzy Mobile Collaboration Performance Measurement Model
Authors: Wang Wei Hong , Hao Yan Mei , Shi Dian Yuan , Cao Yu Hui
Published: October 2013

Against the question of mobile terminal collaboration resources and its constraints in mobile collaborative environment, a multi-level fuzzy mobile collaboration performance measurement model was proposed, which can take advantage of these limited resources effectively and improve the cooperation efficiency of mobile group. At first, the basic concepts, theory and patterns of mobile collaborative performance evaluation system were analyzed. Then, a mobile collaborative performance evaluation system was built based on them using the analytic hierarchy process and fuzzy comprehensive evaluation to evaluated the collaborative performance, and finally put forward countermeasures and suggestions to improve the group cooperation..
The Fault Diagnosis for Warship's Power Plant Based on Association Rules
Authors: Jia Zhi Qi , Gou Yu Ling , Han Xin Jie , Chen Lan
Published: October 2013

Warship's power plant is the core part. The fault diagnosis for it is much more important. With the development of information technology on warship, a large amount of operation and maintenance data has accordingly arisen. Based on the data mining, it can not only directly find relative factors leading to its failure, but also form associated fault diagnosis rules preventing the occurrence and expansion of secondary fault. In actual operation, the engineer can directly judge fault type according to the association rules and take the corresponding solutions. After validation, this method can improve the timeliness and accuracy of fault discovery effectively, and it is also used to fault prediction.
Study on IGMP for PLC in Intelligent Manufacturing System
Authors: Wang Guang Fu
Published: October 2013

This paper discusses a new solution for IGMP (Internet Group Management Protocol) for PLC (Programmable Logic Controller) in intelligent manufacturing system. It is based on the study of a new PLC design with an Ethernet switch device 88E6165 embedded in it. The switch passes IGMP traffic from the external switch ports to the CPU (Central Processing Unit) for snooping and forwarding via the CPU Ethernet interface. The architecture of multi hosts in the intelligent manufacturing system is given in the paper. The use case(s), actors and process are also analyzed to perform the switch operations with IGMP. This process uses a switch manager to perform a manager role to periodically query all devices in the subnet and subsequently. It causes devices to re-join the multicast group of listeners for any stream in which they may be interested.
Design of Process-Optimization Expert Control System for Vertical Sieve-Tray Tower and Grinding System
Authors: Liu Hui , Shen Jie , Li Cheng Ming , Shi Zhe , Qiu Jun Lin , Xu Li Zhong
Published: October 2013

Vertical Sieve-tray Tower (VST) and grinding system are the key equipment of cement production line. The production of VST and grinding system involves complex physical and chemical mechanisms, harsh operating environment, fuzzy changing boundary conditions. It shows a multi-field coupling integrated complex multiphase. Yield, quality, efficiency, safety, energy conservation, emission reduction and other operational indicators of the system is not only interrelated but also mutual restraint. The physical relationship between system operation and system control performance indicator is not clear, so it is difficult to adopt traditional control methods based on mechanism modeling and model-based analysis. In view of that, a design of process-optimization expert control system is proposed for VST and grinding system. The system model is designed according to energy consumption and operating experience. It has optimal control of the entire procession for equipment operation and achieves minimum energy consumption to meet the production requirements.
Design and Implementation of Blank-Filling Test Module in the Theory Examination System for Tower Cranes
Authors: Dong Ming Xiao , Tian Jun Ru , Li Rui Chuan , Lu Meng Meng , Luo Ren Yu , Jiang Ming Shi
Published: October 2013

In order to achieve the function for automatic test paper and automatic scoring of blank-filling test module in the theory examination system for tower cranes, first of all, the blank-filling is classified based on the answer complexity of blank-filling, and the questions of blank-filling related table structure are designed. Then, test paper is automatically generated by extracting the corresponding questions based on the different random numbers generated random function rand (). Scoring is automatically accomplished by using the matching mode technology which compares the examinee answer and standard answer. Finally, the score is cumulated to calculated achievement for blank-filling test module by extracting the examinee score of the relevant information table. Therefore, the implementation of automatic test paper and automatic scoring can ensure the effectiveness of the test papers and the accuracy of the papers marked.
Variable Structure Guidance Law for Supersonic Missile to Maneuver in Large Airspace
Authors: Zhao Hong Chao , Yang Xiu Xia , Song Zhao Qing
Published: October 2013

The large airspace varying trajectory is modified to large airspace spiral maneuver trajectory, in order to improve the penetration effect of a supersonic anti-warship missile against enemy long-distance ship-to-air missile (LDSAM). In the descent phase the missile may suffer the interception of LDSAM, so the descent phase is modified to spiral maneuver descent trajectory. A variable structure guidance law is designed firstly. On the basis of it, a variable structure guidance law with spiral maneuver is proposed, in order to realize the large airspace spiral maneuver trajectory. The simulation results show that the proposed guidance law can guide the supersonic anti-warship missile to realize the large airspace spiral maneuver trajectory. The entire missiles performance indexes satisfy the flight requirement.
Study on Durability of Concrete with Machine-Made Sand Part II: Long-Term Carbonization
Authors: Zhao Shun Bo , Li Yu Tao , Xu Yang Yang
Published: October 2013

This paper introduces the experimental results of long-term carbonization of concrete with machine-made sand (MSC), which is part of the studies on durability of this new concrete. Three strength grades of concrete C30, C40 and C50, and the contents of stone powder in machine-made sand of 5%, 9% and 13% in mass were considered in the mix proportion of concrete with machine-made sand. The ordinary concrete with natural river sand in the same strength grade was tested at the same time for comparison. The test was conducted for 360 days, and the results showed that the carbonization of MSC was similar with that of ordinary concrete, the carbonized depth increased with the increasing carbonization time. The carbonization was rapid at initial before 28 days, and became slowly with the time going by. The content of stone powder in machine-made sand affected the carbonization of MSC in some extent, which should be limited in a reasonable range. Based on the test data, the formulas for forecasting the carbonized depth of MSC are suggested.
Analysis of Disaster-Prevention Index System of Urban Underground Transportation Junctions
Authors: Song Bo , Guan Wen Long , Xia Zhen Wen , Cao Yan
Published: October 2013

On the basis of current situations of urban underground transportation junctions and combining with on-site investigation of Beijing Xizhimen transportation junction station, this paper puts forward the disaster-prevention index system of urban underground transportation junctions. Specific analysis is on the disaster index in four aspects: informational sign, fire-fighting equipment, evacuation capability and refuge. 17 indexes are extracted reflecting the disaster evacuation performance, the weights of each disaster-prevention index are defined by Analytic Hierarchy Process (AHP), and fuzzy comprehensive evaluation method is adopted to conduct comprehensive evaluation of safety performance. The established disaster-prevention index system has practical value and significance to improve the disaster-prevention capability of urban underground transportation junctions.
Optimization Study of Subway Station Underground Excavation Construction Method Based on Fuzzy Theory
Authors: Geng Dong Yang , Yu Xiang Mei , Cao Li Jun
Published: October 2013

Undercutting method is now adopted in prosperous cities or complex areas with all kinds of surroundings, but this method has great risks. Undercutting method includes many ways, it is important to choose a rational one in one certain project. Based on the design and the construction, this paper analyzes the CRD method, the PBA method, the Middle Hole Construction method and the Double Side Drift method which were widely used in China. The paper takes the safety, the cost and the construction time into account, using Comprehensive Evaluation and Fuzzy Mathematics to make sure that the chosen construction method is the most feasible one. Through analysis we could ensure that the construction of the Metro engineering is safe, economic and quick.
Experimental Study on Compatibility between Alkali-Free Liquid Concrete Accelerators and Cement
Authors: Guo Wen Kang , Wang Li , Wang Shu Yin , Lan Dao Yin , Li Sheng Ping
Published: October 2013

This paper selected two kinds of alkali-free liquid concrete accelerators and tested their compatibility with ordinary Portland cement, Portland cement and moderate heat Portland cement by measuring the setting times, compressive strength and compressive strength ratio of samples. The results showed that the compatibility is good between alkali-free accelerators and two types of cement: ordinary Portland cement and moderate heat Portland cement. However, the compatibility of two accelerators and Portland cement are quite different, the compatibility of AFA-2 accelerator is excellent, but AFA-1 accelerator is very poor. The setting times of alkali-free accelerators is mainly influenced by the mixing materials content, gypsum content, C3A and C3S content. In order to ensure the mechanical properties and durability of concrete, the setting times of new concrete accelerator is not the shorter the better, the appropriate initial and final setting times are 1min30s~5min and 4min~ 12min respectively.
Identification and Gradation of Risk Sources in Subway Station Construction Based on Hole-Pile Method
Authors: Geng Dong Yang , Cao Li Jun , Yu Xiang Mei
Published: October 2013

This paper identifies and grades the major risk sources in the Center Street Subway Station in Shenyang, by adopting the Fuzzy Theory to make identification and gradation of risk sources in subway station construction with hole-pile method. By the analytic hierarchy process, it computes the weight and membership of every risk source during the construction process, establishes the evaluation model for identification and gradation of risk sources in hole-pile construction of subway station, obtaines the weights and indictors during the overall construction process of the Center Street Subway Station in Shenyang, and finally determines the danger level in subway station construction under the maximum membership principle. The research gives a reference for hole-pile construction of subway station.
The Research of Safety Management Model of Shield Metro Construction Based on PCA-AHP-FUZZY
Authors: Zhao Jin Xian , Li Long , Gou Min , Xia Yun Bo
Published: October 2013

This paper proposes the index set of safety management of shield metro construction, then realizes the PCA dimension of the 24 indexes in the set. By integrating and restructuring the 9 principal component which we got as the SPSS operate result, the Index System of safety management of shield metro construction is built up. Combined with FUZZY theory, the safety management model of shield metro construction is established. Finally, combined the practical engineering, this paper analyzes the result of safety management, and gives the improvement suggestion against the shield metro construction.
Influence of the Dynamic Excavation Construction Procession Rail Transit Projects in Deep and Large Foundation Pits
Authors: Wu Hong Xiao , Li Lang , Shi Cun Cheng , Chen Yi Hao , Hu Xiao
Published: October 2013

In the construction of high-rise buildings, the effect produced by the excavation of deep and large foundition pits on the surrounding structures cannot be ignored. This paper presents a case study from a construction project located in Nanjing, in which the dynamic excavation process of a founditon pits is numerically analyzed with finite element method on Plaxis. The impact of various excavation stage on subway tunnel nearby is achieved in terms of the results of data analyses and assessments.
Numerical Analysis of Slot Stability during the Supper-Deep Diaphragm Wall Construction
Authors: Yang Bao Zhu , Zhang Shu Chao , Luan Kai Yun
Published: October 2013

Two subway stations of line Z1 were built in Tianjin cultural center and Tianjin Yujiapu traffic hub. The diaphragm wall depth of the two stations was more than 60 m. The geological and hydraulic conditions were different in the two site. Keeping stability of slot wall was the key of supper-deep diaphragm wall construction to the both stations. Two 3D numerical models were built by ABQUS software to simulate the grooving process. The conditions of different slurry specific gravity and grooving depth were calculated. The deformation laws of the slot wall and ground settlement around the slot wall were studied. The results showed the upper soft silty clay and deeper silty sand layers were easy collapse. Finally, some technologies such as "] [" type guide wall, properly improving slurry specific gravity, soil cement mixing reinforcement were suggested to improve the stability during the diaphragm wall construction of the two stations.
Finite Element Analysis of Influencing Factors of the Spherical Bearing Horizontal Offset in an Interchange Curved Bridge in Beijing
Authors: Yang Guang , Wang Yuan Qing , Zhang Tian Shen , Zhang Yan Nian
Published: October 2013

In order to ensure the safety of the curved girder bridge operations, the actual testing is necessary to determine the impact of various factors on the horizontal offset of the bridge bearing against bearing defects. In this paper, finite element analysis with Midas/Civil is applied to each factor separately to get the spherical bearing offset of various factors which compared with the actual displacement analysis, and get the impact the bridge itself gravity, the vehicle load generated by the centrifugal force and the temperature load to the spherical bearing horizontal offset. The analysis results show that the main reason of the spherical bearings horizontal offset is climb shift of the bridge in temperature load. On this account, make effective measures for the protection and repair of bridge to ensure the safety of the bridge operations.
Study on Probability Distribution Models of the Subgrade Continuous Compaction Indicator
Authors: Jiao Tan , Wen Xue Hui , Wang Xiang
Published: October 2013

The paper based on the site of a subgrade compaction test data, used the continuous compaction indicator CMV as the analysis variable, filtered the date based on the influencing factors of CMV, and used the common probability models for statistical analysis,finally got the probability distribution models with which the CMV data comply, then chose the most accurate distribution model. The result showed that the lognormal distribution was the most accurate distribution. After being examined in two other test sections, the lognormal distribution was also the most accurate distribution. It provides a reference for the continuous compaction quality testing of the subgrade.
Settlement Analysis for Embedded Foundation Resting on Non-Homogeneous Subgrade
Authors: Du Qin Wen , Fu Jian Guo , Yang Zhen
Published: October 2013

Elastic modulus of soil increases continuously with depth because of the overburden pressure. By combining the modified Mohr-Coulomb elastic-plastic constitutive model with this type of nonhomogeneous subgrade and considering factors of embedment depth of foundation, friction coefficients between the foundation bottom face and soil, the nonhomogeneity and strength of subgrade soil are analyzed by FEM method. It is shown that the settlement laws of the magnitude and the distribution range of the subgrade are different to other models using in literatures ordinarily
Construction and Sustainable Development of Pipe Networks of Underground Drainage System
Authors: Li Qin Shan , Wang Tie Cheng
Published: October 2013

The urban underground pipe network plays a vital role in the city development, the construction of unreasonable urban pipe networks restricts the city development, even has a disastrous effect on the city. However, it is not desirable to overstate the investment of the urban underground pipe network excessively. It is an important subject of the city construction that how to establish reasonable urban pipe networks to meet service conditions of underground pipe networks. Because the construction of underground drainage pipe networks of most of the major cities in our country mainly comes from the 50s of last century and there are more pipe network system with the development of the city, it is the main content of our research that how to reform and construct them under the condition of existing underground pipe networks.
Ultrahigh Performance Concrete: A Potential Material for Sustainable Marine Construction in View of the Service Life
Authors: Gu Chun Ping , Sun Wei , Guo Li Ping , Wang Qian Nan
Published: October 2013

Ultrahigh performance concretes (UHPC) are promising materials for the next generation infrastructures due to their superior mechanical properties and durability. In this paper, comparison studies were conducted to show the potential of UHPC for sustainable constructions in chloride environments in view of service life. For reinforced concrete, the service life was calculated with analytical solution of Ficks second law on diffusion. And for reinforced concrete with nonlinear initial chloride profiles and depth-dependent chloride diffusion coefficient, a numerical method based on the Crank-Nicholson numerical scheme was adopted to predict the service life. The results show that the reinforced concrete structures constructed and repaired with UHPC have much longer service life than that of normal concrete (NC) and high performance concrete (HPC). It hence needs less cost for maintenance and reconstruction, which fulfills the requirements of sustainable construction.
Evaluation of Grouting Effect Detection in Goaf
Authors: Bai Hui Ren , Li Jing Jing
Published: October 2013

The paper mainly introduces the problem of grouting reinforcement of buildings over the old goaf, and presents to the positioning of grouting reinforcement technology in the goaf. Combined with engineering example, the paper discusses the grouting filling method to strengthening governance goaf. Three methods including drill detection, ground penetrating radar (GPR) detection and electromagnetic wave CT method are used for integrated detection.
Research on the Roller Intelligent Detection System Based on LabVIEW
Authors: Okumura Ummin , Qi Yu Jie , Long Yun , Zhang Tian Hang
Published: October 2013

Based on the platform of LabVIEW, a set of roller intelligent detecting system is developed. With this system, it is easy to realize functions of fast nondestructive testing of subgrade compaction degree, roller speed, rollers compaction trajectory, compaction times, GPS real-time positioning as well as saving and printing report forms. Compared with traditional detection methods, this detecting system can test and control on-site compaction quality much more easily, in order to speed up the construction progress, improve the quality of subgrade compaction, control and manage compaction work better.
Study on Compression Deformation Characteristics of Coarse-Grained Soil in High Filled Subgrade
Authors: Liu Qun , Deng Xiang Bo
Published: October 2013

Coarse-grained soil is widely used in railway construction, and it is of great significance to take research on how compression deformation characteristics affect deformation of coarse-grained soil in high filled subgrade. To analyze compression deformation characteristics of coarse-grained soil under different moisture content and different grain compositions conditions, influence pattern of moisture content and grain compositions was researched through uniaxial compression test. The result indicates that compressive deformation is in logarithm relation with time; moisture content and grain compositions are important factors that affect the characteristics of compressive deformation of sandy slate coarse-grained soil and it is better to control subgrade settlement with dry or saturated coarse-grained soil which contains 70% coarse particles.
Numerical Simulation of Impacts of Different Types of Air Duct Outlets on Ventilation Efficiency
Authors: Nan Chun Zi , Ma Ji Ming , Zhao Luo
Published: October 2013

To enhance the exhaust efficiency during ventilation, three types of air duct outlets were imported. According to the characteristics of velocity distribution simulated by numerical method, the flow field is divided into the mixing zone and the exhaust zone. The gradual contracted air duct outlet can enhance the mixing effect between fresh air and smoke. In the exhaust zone, however, the flow velocity on the upper section of the tunnel is weakened, which is unfavorable for smoke exhaust. Gradual expanded air duct outlet, on the contrary, may weaken the concentration effect of the airflow. The flow velocity on the upper section of the tunnel is increased in the exhaust zone, thus the flow field is more homogenized, which is in favor of smoke exhaust.
Aerodynamic Optimization of the Windscreens for Railway Bridge in Strong Wind Areas
Authors: Ma Cun Ming , Duan Qing Song
Published: October 2013

With the development of economy and technology, many high-speed railways have been constructed. However, many of these railway lines have to pass through strong wind areas, and the cross wind in these areas would reduce the operational safety, thus windscreen is an effective facility in many engineering cases to protect the running trains from strong winds. There are two kinds of windscreen, the unilateral windscreen and the enclosed windscreen. By numerical wind tunnel technique, the impacts of the two kinds of windscreen on the lateral force acted on the running trains are analyzed, meanwhile the operational safety could be also evaluated. According to the research results, the moment coefficient has a relatively small variation when the height of the windscreen is more than 3m. The unilateral windscreen with a ventilation rate of 20% is more favorable for the operational safety than the enclosed windscreen.
Dynamic Response Analysis on Train Liquid Storage Tanks under Impulsive Excitation
Authors: Zhang Qing Hua , Yan Dong Jie
Published: October 2013

Take the typical train liquid storage tank as research object, the vibration modes and the fluid-solid coupling dynamic responses of the tank are analyzed under the impulsive excitation using finite element software ANSYS. The research indicates that the difference of the liquid volume in tank has great influence to the structural stress and strain. With the increasing of the liquid volume, the tank natural frequencies gradually reduced, so the liquid sloshing have great effect on the structural vibration modes. And if the tank is full of the liquid, the stress and total deformation of the tank can be obviously reduced.
Influence of CaO-Based Expansive Agent on the Deformation Behavior of High Performance Concrete
Authors: Zhang Shou Zhi , Tian Qian , Lu An Qun
Published: October 2013

In order to improve the volume stability of high performance concrete, the effects of deformation behavior of high performance concrete containing CaO-based expansive agent were investigated. Concrete samples prepared without or with CaO-based expansive agent were compared through expansion under water curing at 20°C, drying shrinkage and autogenous shrinkage measurements. According to the experimental and analytical results, the new type expansive agent can control volume stability for high performance concrete. The addition of 10% CaO-based expansive agent not only built effective expansion in high performance concrete whatever under saturated condition or under sealed condition, but also substantially reduced its drying shrinkage.
Model Analysis of Rheological Properties of Special Self-Compacting Concrete Paste for High-Speed Railway
Authors: Wang Hui Xian , Ma Bao Guo , Tong Yu Ping , Chen Xi , Ma Jun Tao
Published: October 2013

The rheological properties of special self-compacting concrete paste played a major role on its performance. The Brookfield R/S SST2000 soft solid tester and TAM AIR 8 channel isothermal calorimeter were used to test the rheological properties and hydration heat effect of special self-compacting concrete paste. The initial cement hydration-rheological model was proposed through the systematical experiments with different water-cement ratio and the chemical admixture, combined with the heat of hydration model of Portland cement. The results showed that the hydration-rheological model of cement paste acted as N, according to the two mutation points on the stress-time curve, which could be divided into three stages, i.e. suspension with no structure, flocculation state structure, condensed state structure. To extend structure mutation values corresponding to the point in time, it can improve the rheological properties of loses with time. With the increasing of water content, heat of hydration effect shows positive effect, but the mechanical effect is weakened. The adding of the superplasticizer delayed the hydration exothermic rate and initial hydration shear stress mutation process.
Structural Design and Artistic Expression of Landscape Multi-Span Arch Footbridge
Authors: Liu Shi Ming , Yang Zhu Lin , Zhao Hui , Li Xiao Ke
Published: October 2013

In order to perfectly make the bridge function, structural style, architectural art modeling with the surrounding environment, this paper, based on the design of landscape five-span arch footbridge, studies the span arrangement, structural style, building materials, railing shape, ornament style and color, and lamplight illumination of the bridge considering the factors such as hydrology, geology, surrounding environment (e.g. buildings and park), traffic flow and entire urban planning. To reduce the stress of main arch and the horizontal thrust of substructure, the new structure of T-frame with sloped plate was put forward to bear the deck loads with the assistance of main plate arch. The thin concrete walls were cast on the top sides of the main plate arch, which were decorated by fine stone with the modern decoration construction technology. The white marble railings present lively morphology with carved lotus and pomegranate on the column cap, and many kinds of flowers on the panels. The spotlights make dramatic night sense for the bridge. Therefore, the landscape footbridge in the classical arch graceful shape was constructed by the modern building material and the optimized reinforced concrete structure, which presents the unity and coordination of structural design and artistic expression.
Effect of Metakaolin-Based Modifier on the Permeability of Concrete Structure in the Marine Environment
Authors: Ma Jun Tao , Yan Liang , Tong Yu Ping , Wang Hui Xian
Published: October 2013

Corrosion of the steel reinforcement in the concrete structure caused by chloride ion penetration becomes more serious in the marine environment. Metakaolin has been widely used in the concrete structure to improve the strength and durability. The combination of metakaolin (MK) and fine fly ash (FA) was studied in the article and the penetration behavior of concrete with various contents of metakaolin-based modifier is investigated. The penetration resistance of concrete was tested in combination of electric flux test. The improving mechanism was studied with mercury intrusion porosimetry analysis (MIP). The experiment results indicate that metakaolin-based modifier improved the penetration resistance of concrete obviously. The combination of fine fly ash weakened the water sucking action of metakaolin and preserved the working performance of concrete. The pore size distribution of concrete containing metakaolin-based modifier has been optimized to improve the microstructure and enhance the penetration resistance of concrete.
Study on Reinforce Saturated Soft Clay Foundation with Dynamic Consolidation by Drainage
Authors: Sui Zhi Li , Li Zhao Guang , Wang Xu Peng , Li Wen Li , Xu Tie Jun
Published: October 2013

Dynamic consolidation method has been widely used in improving soft land, but always inefficient to saturated soft clay land, which is hard to improve, and even leads to rubber soil. Dynamic and drain consolidation method will deal with it well, with drainage system, pore-water can be expelled instantly from saturated soft clay as impacting. The pore-water pressure and earth pressure test in construction, the standard penetration test, plate loading test, geotechnical test after construction, which are all effective methods for effect testing. There is a comprehensive detection through different depth of soil layer with different detecting means on construction site. The results show that improving saturated soft clay land with dynamic and drain consolidation method has obtained good effect, and the fruit can be guidance for such construction in the future.
Study on Shear Strength Experiments Base on the Modified Direct Shear Apparatus for Unsaturated Soils
Authors: Chen Gao Feng , Lv Ying Fa , Huang Zhi Huai , Chang Yan
Published: October 2013

The unconsolidated-undrained fast shear tests of saturated-unsaturated remolded soil samples under different moisture content which is 1.1%, 10.1%, 14.9%, 19.9%, 24.2%, 29.9%, 37.7% respectively, and normal stress which is 50kPa, 100kPa, 200kPa, 300kPa, 400kPa respectively, were studied by the modified SDJ-1-type strain direct shear apparatus and U.S. Lab VIEW data acquisition system. The shear strength parameters of unsaturated soil samples, i.e. general cohesion and general internal friction angle were obtained based on Mohr-Coulomb strength theory. The test results showed that the general cohesion firstly increased and then reduced with the moisture content increasing, and the general internal friction angle increased with the moisture content decreasing. The function between the general shear strength parameters and the moisture content was studied. The concept of general shear strength parameters was proposed in the paper, and would provide a simple and practical method to obtain the strength parameters for engineering practice.
Correlation Analysis of Physical and Mechanical Soil Parameters in Coastal Plain Region
Authors: Sun Li Mei , Liu Xia , Zhang Zhan Rong
Published: October 2013

According to the tested physical and mechanical soil parameters of the Coastal Railway in West Guangdong along the broad coastal plain region, the correlation relations between compression modulus, compression coefficient and void ratio, moisture content, density, standard penetration number are analyzed by the linear regression method. The results show that the compression modulus increases with the increase of water content and void ratio, with correlation coefficients being 0.6985 and 0.8147, respectively; the compression modulus decreases with the increase of density and standard penetration number, with correlation coefficients being 0.7827 and 0.4934, respectively; the compression coefficient decreases with the increase of water content and void ratio, with correlation coefficients being 0.9131 and 0.9412, respectively; the compression coefficient decreases with the increase of density and standard penetration number, with correlation coefficients being 0.8187 and 0.4985, respectively. The parameters which are hardly obtained from the test directly can be easily evaluated by using these formulas.
Application of Pine Piles for Strengthening High Slope Channel Retaining Walls on Soft Soil Subgrade
Authors: Yang Tan Shu , Tan Yang Qu , Luo Cui Juan
Published: October 2013

In the modification of narrow deep soil channels of early urban excavation, because of great depth and steep slope, the gravity retaining wall slope will be needed. The problems of soft soil subgrade treatment at channel bottom have to be solved. Combined with the old channel treatment project of a city, as practical example, the method by which the soft subgrade of channel retaining walls strengthening with pine piles, is described. By application of Coulomb Theory, the stability calculation for gravity pitch-up oblique retaining walls is conducted. The results show that using pine piles is a good method for strengthening the soft soil subgrade with small thickness below the water level.