bluuebunny/crossref_metadata_2025 huggingface dataset:
Design and Implementation of the Multifunction Fast Charger for LiFePO4 Battery
Authors: Chang Wen Yeau
Published: July 2014

The paper proposes a multifunction charger for LiFePO4 battery. The proposed multifunction charger contains charge circuit for LiFePO4 battery and state of charge (SOC) estimation system. With a micro processor integrated, the proposed charger is capable of digital control to improve the system reliability. The fast charger uses pulse current charging circuit which integrates micro processor, voltage detecting interface, current detecting interface and control software. The user can adjust the duty cycle and frequency of charging pulse by controlling the pulse width modulation (PWM) signal. The proposed battery state of charge estimation system is based on the radial basis function (RBF) neural network approach. The architecture of RBF neural network used in this project contains an input layer, an output layer and a hidden layer. Input layer has 3 neurons which are impedance, voltage, current of battery and output layer has one neuron which is SOC. To verify the performances of the proposed multifunction fast charger, a prototype charger has been tested on practical LiFePO4 battery. The field practical operations of the prototype charger were studied in accordance with the conditions for the different charging modes.
Design and Simulation of a Photovoltaic Emulator System Based on a Full-Bridge Structure
Authors: Yang Li Yong , Chen Qiang Nian , Yang Shuo
Published: July 2014

In this paper, the design and simulation of a photovoltaic (PV) emulator are presented. The output characteristic and I-V curve are produced based on mathematical engineering PV module, so that they are similar to the practical curves. The proposed system consists of a single-phase full-bridge PWM rectifier and a DC/DC buck converter, which can reduce the voltage ripple and improve the power factor near the grid. The rectifier uses double-loop control strategy and the buck circuit uses the formula of the PV module to control output voltage and load current. Using Matlab simulation, the result proves feasibility and good performance of this scheme, and simulation waves can reflect the change of temperature and light intensity.
Side Slip Angle Observation of Steer by Wire System
Authors: Li Fang , Geng Shu Fang
Published: July 2014

Sideslip angle and yaw rate can reflect the essential characteristics of the vehicle steering motion in steer by wire system, and determine the stability of the vehicle, sideslip angle is generally obtained through observation. In order to enhance the stability of the vehicle, hybrid observation method for side slip angle is used, in which dynamic integration is mainly used when the raw rate is relatively small, and extended kalman filtering is mainly used when the raw rate is large. In the observer design, the value and change rate of raw rate is used to calculate a weight coefficient to determine the proportion of two observation method in the observer. The simulation results show that the method can efficiently decrease the observation error of the side slip and improve the observation accuracy.
A Method of Controlled Islanding Strategy Based on Artificial Fish Swarm Algorithm
Authors: Wang Yi Fei , Tang Fei , Liao Qing Fen , Yang Jian
Published: July 2014

Optimal controlled islanding strategy searching is a complex combinational optimization problem. Artificial fish swarm algorithm (AFSA) based on the simulation of fish swarm is an intelligent meta-heuristics. In this paper, AFSA is applied to the searching of optimal controlled islanding strategy. In order to minimize the unbalanced power in each island, a mathematic model is established with some constraints. Simulation result on IEEE-39 node system shows that the proposed method can obtain the optimal strategy promptly and has strong global search ability.
A Modeling Method and Comprehensive Algorithms of High Impedance Fault in EHV Transmission Lines
Authors: Chen Cheng , Li Chun Ming , Li Ju , Dong Wei Chuan
Published: July 2014

The accurately mathematical models, simulation models and protection algorithms of high impedance fault (HIF) on transmission lines are difficult problems. Based on the measured data and physical phenomena, a new mathematical model of HIF was presented by numerical analysis methods and MAYR’s equation. Using EMTP, the model of HIF includes a group of nonlinear time-varying resistances and a dynamic arc resistance. Based on the features of HIF under different frequency bands, this paper presents HIF comprehensive detection algorithms containing four algorithms, and analyzes the logic between each algorithm. Finally, the models and algorithms are simulated.
Study on Microstructure of NiCrMoY Alloy Coatings
Authors: Hu Chun Lian , Hou Shang Lin
Published: July 2014

The microstructure of rare earth NiCrMoY alloy manufactured by atomization and oxygen-acetylene flame spray and high frequency induction remelting technique is investigated by a combination of scanning electron microscopy (SEM), energy spectrum, X-ray diffraction meter (XRD). The results indicate that Microstructure of NiCrMoY alloy coatings are finer and bulk-and needle-like hard Metallograph are precipitated, a new phase MoB is produced.
Distributed Circuit Simulation by Using Backward-Traversing Waveform Relaxation
Authors: Chen Chun Jung , Yang Tai Ning , Sun Jenn Dong , Tsai Chang Lung
Published: July 2014

This paper describes methods to utilize the multi-core PC as well as computers connected by internet to perform MOSFET circuit simulations. The Combining Simulation Method (CSM) is the used parallel algorithm. This paper also presents an automatic method to partition the simulation jobs in CSM. All proposed methods have been implemented and tested. Experimental results justify pleasing effects of proposed methods.
Miniaturization Design of the 5.8GHz RFID Antenna Based on Metamaterial
Authors: Geng Peng , Yang Shu Hui , Wang Yue , Chen Yin Chao
Published: July 2014

In this paper we designed a 5.8GHZ microstrip antenna whose relative bandwidth is 3.77% and return loss is-36.941dB. It meets the needs of RFID systems.Besides, the resonant frequency of the antennas is reduced to 5.2GHZ, after adding the “I” ring resonator. Also, the paper shows that the other performance of the antenna still meet the RFID system requirements. It is 47.1% of the original size after adjusting the resonant frequency of the antenna to 5. 8GHz.
Parallel Circuit Simulation by Using Simulation-on-Demand and Iterated Timing Analysis
Authors: Chen Chun Jung , Sun Jenn Dong , Yang Tai Ning , Lee Chih Jen
Published: July 2014

This paper considers utilizing the popular ITA (Iterated Timing Analysis) algorithm in CSM (Combining Simulation Method) to do parallel large-scale circuit simulation. An automatic partitioning method for jobs of CSM is presented, in which the related load balancing issue is also discussed. All proposed methods have been implemented and tested. Experimental results justify pleasing effects of proposed methods.
Computation Model and Influencing Factors Analysis for Dynamic Characteristic of Underwater Monitoring Platforms
Authors: He Kong De , Fang Zi Fan , Zhang Yi , Yang Wei Hua
Published: July 2014

The computational model for underwater monitoring platform with drag force, normal lift along flow and buoyancy was formulated aimed at dynamic characteristic by the finite computing method of structure vibration modal on flow field and infinitesimal method idea, and taking into account the influence of flow force to structures dynamic characteristic. Discuss the influencing factors for natural frequency of underwater monitoring platform by numerical analysis method. Natural frequency of buoy was far from the vortex release frequency by adjusting the influencing factors. This method can effectively decrease the vibration by resonance and it has important significance to design the underwater monitoring platform.
Detection of Wear Condition of Micro Milling Cutters Based on Length Fractal Dimension
Authors: Wang Zhi Qiang , Zhang Gui Ying , Liu Bin
Published: July 2014

In this paper, a new method to realize online wear detection of micro-milling cutters based on length fractal dimension is proposed. On the basis of expression derivation of length fractal dimension, experiments are conducted. First, several cutters with different wear condition are chosen as reference samples. Their multi-section vibration signals in time-domain are collected and the clustering domain δ of each sample are obtained based on length fractal dimensions. Then, the vibration signals of tested cutters are monitored and analysed in time domain, thus their length fractal dimension are abstracted. Comparing the length fractal dimension of tested cutters with the clustering domain δ of reference samples, the wear condition of tested cutters are detected. The experimental results show that the length fractal dimension of each tested cutter falls in the clustering domain corresponding to the actual wear condition.
Research on Excitation & Measurement Strategy of Tuber Electrical Resistance Tomography System
Authors: Deng Xiang , Dong Zhao , Chen Lu , Liu Hao
Published: July 2014

The non-invasion electrical process tomography of plant tuber or root is a new research field in the accurate cultivation of plants. Tuber Electrical Resistance Tomography (TERT) is aimed to extend the application of the technology into agriculture, which can help improving and breeding new varieties of the crops. This paper mainly studies excitation & measurement strategy. Especially the influences on distribution of sensitive field brought by the width and numbers of the array electrodes in the soil environment are analyzed. Besides, the relationship between the electrical conductivity and the measured boundary voltages is also discussed.
Analysis of Parameter Estimation Using Pei Algorithm of FRFT
Authors: Deng Bing
Published: July 2014

Parameter estimation of chirp signal is analyzed using Pei algorithm of FRFT (Fractional Fourier Transform). Firstly, the model of parameter estimation has been made. Secondly, the factors influencing the estimation accuracy have been analyzed. Finally, the simulation has been made to verify the conclusions.
Design and Development of a 14-Pole HTS Filter with the Reflected Group Delay Method
Authors: Liu Yong Xia , Du Jian Chang , Ji Lai Yun
Published: July 2014

In this paper, a 14-pole HTS filter is successfully designed and developed, which based on the reflected group delay method. The principle, design process, simulation are demonstrated. The filter is fabricated on a MgO substrate with double-sided DyBa2Cu3O7HTS thin films. The filter’s center frequency is 813.5MHz with a bandwidth of 15MHz, the return loss is better than 20dB.
Design of Lightweight Hash Function Based on Iterate
Authors: Gao Shu Jing , Zhang Rui Quan , Zhang Wei
Published: July 2014

A hash functionhMISRthat suitable for passive devices is proposed. Taking parallel LFSR as the basic componenthMISRprovides the security through one-wayness brought by the information loss in the process of compression. When implemented, the hardware complexity ofhMISRis much lower than Toeplitz hash.
Research of Discrete Curvature Estimation Method Based on Local Space Parabola
Authors: Ma Jian Wei , Jia Zhen Yuan , Wang Fu Ji
Published: July 2014

Curvature estimation of 3-dimension discrete points performs an important role in dealing with scan line point cloud and is difficult to calculate. A discrete curvature estimation method based on local space parabola is proposed. Method in this paper is contrasted with circular arc fitting method and simulation experiment shows that the proposed method is feasible and effective with high precision.
A Gossip-Based AOA Distributed Localization Algorithm for Wireless Sensor Networks
Authors: Cui Wen , Wu Shao Chuan , Wang Yu Ze
Published: July 2014

Position information of individual nodes is useful in implementing functions such as routing in wireless sensor networks. Distributed localization method has been widely concerned in the case of no central processor is available to handle the calculations in the networks. In this paper, we focus on distributed localization techniques based on angle of arrival information between neighboring nodes. A novel distributed cooperative localization method based on gossip algorithm is proposed, which can obviously improve the positioning performance of the previous methods.
Aluminium Alloy Welding the Weld Stress Deformation and Control
Authors: Meng Qing Guo , Yin Ying , Guo Xiao Jun
Published: July 2014

Welding technology, as one of the process of manufacturing material in the permanent link, are already widely used in various kinds of aerospace ground launch equipment. Modern manufacturing industry is in rapid development phase, the welding automation is inevitable trend of production, which not only can greatly improve the efficiency of welding, but also what more important is to ensure the welding quality, thus to improve the operating environment. Modern welding is developing in the direction of mechanization, automation, intelligence, robot welding has become an important symbol of welding automation technology modernization. This paper focuses on regularity and influence of welding deformation, the welding deformation and deformation control, control and eliminate problems for research.
A Scalable Data Platform for Cloud Computing Systems
Authors: Liu Liang , Wo Tian Yu
Published: July 2014

With cloud computing systems becoming popular, it has been a hotspot to design a scalable, highly available and cost-effective data platform. This paper proposed such a data platform using MySQL DBMS blocks. For scalability, a three-level (system, super-cluster, cluster) architecture is applied, making it scalable to thousands of applications. For availability, we use asynchronous replication across geographically dispersed super clusters to provide disaster recovery, synchronous replication within a cluster to perform failure recovery and hot standby or even process pair mechanism for controllers to enhance fault tolerance. For resource utility, we design a novel load balancing strategy by exploiting the key property that the throughput requirement of web applications is flucatuated in a time period. Experiments with NLPIR dataset indicate that the system can scale to a large number of web applications and make good use of resources provided.
A WCET Test Method Based on Associative Process Communication
Authors: Li Jun Yi , Zhang Yi , Li Ren Fa
Published: July 2014

The Real-time system estimates the worst-case execution time (WCET) of the program to ensure the real-time requirements of the system. In this paper, a test method based on Associative Process Communication (APC) is put forward. First it tests the WCET value of basic blocks of ICFG through the use of APC algorithm, and then estimates the WCET by analyzing the worst execution path of the basic block. APC test method tests all benchmarks of Mälardalen. And the test results show that the proposed test method is precise and effective, and the test error is within the theoretical analysis.
Design and Research of Interactive Behaviors in Modern Healthcare Scenarios
Authors: Li Si Wen , Liu Jing Hua , Hu Lei , Wei Xiao Dong
Published: July 2014

Healthcare scenarios are human-machine systems which involve diverse linked products. Based on analysis of key elements of healthcare scenario under overall digitalization, the paper proposes a new definition of modern healthcare scenario from a system perspective and summarizes three dimensions of interactive relations in modern healthcare scenarios. According to data from field interview and case study, the paper thoroughly discusses forms and implementations of the interactive relations in healthcare scenarios from three aspects, i.e. information interaction, human-machine interaction and space interaction. We think the in-depth study of interactive relations in modern healthcare scenario can aid in the requirement elicitation process of medical product design and intra-hospital communication technology development.
Design of QoS Protocol Matching Method in the DDS Specification
Authors: Li Chang Qing , Zhou Chi , Zhu Shi Bing
Published: July 2014

In this paper, based on QoS Policy of current DDS, a similarity-matching function of QoS Policy combinations is designed between the publishers and the subscribers, and corresponding flow is also designed to match those QoS Policy combinations.
Design of Zigbee Wireless Transmitter Based on C8051F350
Authors: Zhu Dai Shan , Wang Chun Yang , Shi Yao Wu , Lv Xu Hao
Published: July 2014

The wire transmissions are commonly used in traditional industrial transmitters, but it has the problems like wiring complexity and inconvenience of installation. The design of zigbee wireless transmitter based on C8051F350 is proposed in this paper, which introduced hardware and software, meanwhile, plenty of experiments have been put forward to test it. The result of these experiments shows that it has the features of low power consumption, flexible networking and scalability. This design solves the problem of field wiring, and it has the advantages of lower cost, easy field-installation and operability.
Gossip Algorithms for Average Energy Estimation in Wireless Sensor Networks
Authors: Wang Yu Ze , Wu Shao Chuan , Cui Wen
Published: July 2014

Gossip algorithms which belong to a kind of distributed algorithms can be used to compute the (possibly weighted) average of the initial measurements of the nodes at every node in the network. This paper proposes an improved broadcast gossip algorithm to estimate average energy with better accuracy. In this proposed algorithm, we use some companion variables to save the sum, and convergence error is decreasing with the number of companion variables increasing. Convergence of the proposed algorithm is studied theoretically and verified by simulations. Although the estimated value is random, we show that the novel algorithm can converge closer to average than broadcast gossip algorithm in probability.
Investigation of Information Management System for the Hoist with AC-AC Converter
Authors: Wang Feng , Qiao Shu Yun , Zhang Xu Long
Published: July 2014

This paper analyses software and hardware, the content of information display and the method of fault diagnosis of the old information management system of the hoist with AC-AC converter. Communication between the information management system and PLC has been investigated. The way to translate the communication protocol of the hoist of AC-AC converter imported has been found. The software Visual Basic 6.0 is adapted to programmer and make up the interface. The faults diagnosis system which can provide the fast device maintenance and the faults localization during system running has been reconfigured.
QoS Oriented PSO Algorithm for Cloud Service Composition Modeling
Authors: Liu Li , Li Yun Fei , Zhang Miao , Liu Song Tao
Published: July 2014

How to select different independent cloud service to compose an optimization service to satisfy user’s QoS requirement is a challenge problem. A QoS oriented particle swarm optimization algorithm is proposed in this paper, which considers multiple QoS parameters in the process of service composition.
Research of Load Balancing Scheduling under Grid Computing
Authors: Cai Cheng Yu , Lou Yuan Sheng
Published: July 2014

In order to make up for the shortage of Min-Min in load balancing, a new task scheduling algorithm T-Max-Int Under the grid computing has been proposed in this paper. In T-Max-Int, the Loss Degree of Max-Int has been brought into Min-Min. T was in the form of percentage, which represents the proportion of selected tasks that have loss degree in the total tasks. Then, experiments of T have been taken to make Makespan the minimum. Finally, T-Max-Int, Max-Min, Min-Min were compared, which proved that T-Max-Min is better than the other two algorithms in aspects of Makespan and load balancing.
Research on Controlling Data Stream of Production Information Platform for Water Production Facilities Based on Bar Bode Management
Authors: Shi You , Liu Guang Yong , Liu Rui Hua , Wu Nan , Pian Cheng Rong , Zhang Qing
Published: July 2014

According to the characteristics of underwater production facilities manufacturing workshop, controlling the production information platform data stream based on bar code management. Firstly, the business model of workshop is analyzed and the data stream of production process is extracted. Secondly, the product information structure tree is designed to control data flow of production information platform. In this way, the data of production information platform can be guaranteed constraints, integrity and uniqueness. Finally, according to the information related products information structure tree, the bar code rules are makes, ensure the data acquisition of process to be more efficiently and accurately. The production process can be monitored and managed in real-time, the production efficiency is improved.
Research on Evaluation System of E-Government Website Group Based on Fuzzy Evaluation
Authors: Han Bing , Wang Bo , Zhang Hui
Published: July 2014

As the development of computer networks the tides of fitness service-oriented government are becoming popular around the world. Now the e-government system has been the core part of the building of service-oriented government. So how to evaluate the construction quality of e-government objectively, discover and solve the corresponding problems in the construction and running during this process becomes an urgent problem in the process of e-government construction. In this paper an e-government website assessment model based on fuzzy evaluation is proposed and an evaluation system for e-government management system is established. Also by using this system e-government management website group system based on cloud model is evaluated.
Research on the Communication Base Station’s Thermal Environment Controlling
Authors: Li Li , Yu Lu Ning
Published: July 2014

To the communication base station’s thermal environment, the influencing factors are proposed and the membership function of evaluation index is set in this paper. The degree of importance and the algorithm of the evaluation index are analyzed by AHP to determine the evaluation level of the communication base station’s thermal environment. The software is designed to evaluate a communication base station’s thermal environment and the result accord with expect, so the method can be used in analogus thermal environment.
The Research of Path Planning Technology during Virtual Assembly Based on CREO Software
Authors: Xiao De Ming , Wang Xiao Min , Zhao Xiao Lei , Pang Li Tao , Lv Zhe , Zhang Qing
Published: July 2014

Based on CREO Parametric 2.0, programmed by Pro/TOOLKIT and used Visual Studio as a developing platform, the virtually loaded path-planning module targets the dismantlement of tooling spring pin as an investigated object, thus enhancing the efficiency of virtual device significantly.
Algorithm Study of Wireless Sensor Location Technology Based on Coalmine Working Faces
Authors: Wang Chun Xiang , Ji Song Bo
Published: July 2014

In order to find out the specific location algorithm suitable for the underground mine and how to realize the applications of the node location.This article through the setting two different coal mine environment (i.e. roadway environment and underground environment of coal mine) from different aspects carry out simulation analysis to four location performance based on range-free algorithm, use the expansion and modeling NS2 simulation platform, obtain the important conclusion: centroid algorithm is the most suitable for long and narrow roadway simulation environment, and DV-Hop is the most suitable for the underground intensive environment of the unknown nodes high density and less beacon nodes.
A Direct Mode Operation Design and Simulation Applied to TD-LTE
Authors: Zhao Zhen , Wu Shao Chuan , Gao Shu Ying
Published: July 2014

This paper offers a DMO (direct mode operation) design applied to TD-LTE. It can support point to point full-duplex communication in the no signal covered area and user switching according to their priority at the same time. The design divides channel into access channel and communication channel to improve the spectrum efficiency. When the SNR is higher than 16dB, the DMO design using QPSK modulation has a BER (bit error rate) reaching 10-4 under ITU-R M1225 channel B. Although at the same BER value, the SNR requirements of IFDMA has a 0.5dB lower than LFDMA, given that TD-LTE uses LFDMA and LFDMA has a good resistance to frequency offset and is much easier to realize, we adopt LFDMA as subcarrier mapping method in the DMO design. Besides, at the same BER value, the required SNR of MMSE (minimum mean square error) equalization is 1.0~1.5dB lower than the required SNR of the ZF (zero-forcing) equalization. Therefore DMO should use MMSE equalization in the low SNR environment and ZF equalization in the high SNR environment.
Optimal Wavelet Basis Selection for Wavelet Denoising of Structural Vibration Signal
Authors: He Can , Xing Jian Chun , Yang Qi  Liang
Published: July 2014

Wavelet basis selection is an important part in the wavelet denoising of structural vibration signal. However, some defects are present in the existing methods, such as large computation and a single optimal index. In order to solve these problems, a new selection method based on multiple index is proposed in this paper. Firstly, the wavelet basis category which suits for the vibration signal denoising is determined by analyzing the characteristics of wavelet basis and vibration signal. Then, a multiple index evaluation function is constructed by mean square error indicator (MSE), signal-to-noise ratio indicator (SNR) and correlation coefficient indicator (ρ), the weights of index are received by analytic hierarchy process (AHP), the wavelet basis with biggest evaluation function value is considered as optimal wavelet basis. At the end of the paper, a experiment is provided to verify the effectiveness of the new method, the results show that the new method is better than the other four methods in MSE, SNR and ρ index.
Application Study on GPS Positioning Technology for Gravity Wharf Deformation Monitoring
Authors: Zhang Hao , Ji Min , Shi Xi , Zhou Sheng Liang
Published: July 2014

This article took gravity wharf engineering as the object of study to explore its deformation law by using GPS positioning technology. First, we will introduce the layout of a GPS control network at the wharf and then monitor the displacement of the gravity wharf through GPS-RTK、DBS-RTK and GPS static positioning technologies separately. Comparing three groups of monitoring data, we came to the conclusion that this gravity wharf is very stable, which has also proved the feasibility to apply GPS positioning technology to the displacement monitoring of the gravity wharf.
A Two Step Damage Prognosis Method for Beam-Like Truss Structures
Authors: Jia Hao Kai , Yu Ling
Published: July 2014

In this study, a two step damage prognosis method is proposed for beam-like truss structures via combining modal curvature change (MCC) with modal strain energy change ratio (MSECR). Changes in the modal curvature and the elemental strain energy are selected as the indicator of damage prognosis. Different damage elements with different damage degrees are simulated. In the first step, the finite element method is used to model a beam-like truss structure and the displacement modes are got. The damage region is estimated by the MCC of top and bottom chords of a beam-like truss structure. In the second step, the elemental MSECR in the damage region is calculated and the maximum MSECR element is deemed as the damage element. The simulation results show that this method can accurately locate the damage in the beam-like truss structure.
Non-Structural Cracking Analysis of Early Age of Basement Structure Based on Field Monitoring
Authors: Yao Ting , Liu Jia Ping , Tian Qian , Xu Wen , Wang Yu Jiang
Published: July 2014

Cracking of basement structure are common problems in civil building, so it’s most import and difficult to inhibiting cracking of building structures. In this paper, real-time continuous monitoring data of strain and temperature were obtained by embedding sensors in practical engineering, including slab and sidewall of reinforcement concrete, while ambient conditions were monitored to assess their effects. The cracking mechanism of such kind of structure was analyzed based on the investigation and monitoring data. The results show that sidewall is easier to crack than slab for basement structures of civil building, therefore, sidewall cracking of basement structure is the most difficult and key point to inhibit cracking. The measures adopted in this project can effectively reduce crack risk of structure. At the same time, the measured data can provide useful reference to control crack for similar projects and research, and they can also be used to verify the numerical results.
Crack Identification of Plane Frames Based on Wavelet Transform of Rotation Modes
Authors: Huang Yan
Published: July 2014

By means of the wavelet analysis theory, the damage identification of plane frame was studied. Based on the finite element analysis of modal parameters, the method using the wavelet analysis of rotation mode was proposed for plane frames crack identification, and the mexh wavelet transform was applied to analyze the rotation mode of plane frame, so the location of crack of the plane frame can be identified by the maximum of wavelet coefficients. Taking one-story plane frame for example, the finite element model, each frame beam and column with a crack, was seperately set up, and the above-mentioned method was applied to identify the location of the crack, and the results validate this method. Finally, compared with the result of the wavelet transform to analysis vibration mode and rotation mode, it can be concluded that the method using the wavelet analysis of rotation mode is more convenient and more effective. This method may be useful in damage identification and diagnosis in structures.
Vibration Test of Hangzhou East Railway Station under Pedestrian Load
Authors: Yu Yan Li , He Wei , Xie Wei Ping
Published: July 2014

Much concern has been paid on the human-induced vibration of high-speed railway station structures in recent years. But the vibration responses are influenced greatly by are two key factors, which are rational pedestrian load model and accurate structure calculation model. Field test, therefore, is the most directly and valuable method to obtain the vibration responses of large-span railway station structure. The vibration responses of the waiting floor of the Hangzhou East Railway Station, which is just completed, are measured and analyzed. The test results showed that the vibration of waiting room floor under pedestrian load cannot be neglected for vibration comfort evaluation.
Experimental Study of CFRP Reinforced Concrete Beams
Authors: Xu Ling , Yu Xiang , Di Zhen Yu
Published: July 2014

Through strengthening experiment of four limit damage reinforced concrete beams by CFRP, the performance index of the carrying capacity, the stiffness and the ductility compared with before strengthening of reinforced concrete beams, and analyzed before and after reinforcement. It shows that the ultimate load, the stiffness and the ductility of limit damage reinforced concrete beams by CFRP have different degrees of increase and can be widely used in practical engineering.
Strain Measuring Techniques of the Geogrid
Authors: Feng Xiao Jing , Zuo Zhong Yi , Tong Wei
Published: July 2014

The strain measurement is a most important and absolutely necessary task on the probing into the constitution of the materials. The ways of strain measurement are theoretically divided as the mechanical type, vibrating-string type, inductive type and bonded resistance type, and the last one is widely used for its high precision and convenience. The geogrid, which has been widespread in the reinforcement structures, is more and more popular for its high strength, good toughness, corrosion resistant, anti-fatigue and effective interaction with soil. The geogrid is made of polymer, its ultimate strain can reach above 10%, and it is sensitive to the time, furthermore it usually has significant relative displacement with soil in the tests. Then some measures have to be taken to make the measuring range wider and make the all gauges achieving synchronization, measures also should be conducted to prevent the strain gauges separated from the geogrid when it has slightly bending, prevent the wires break when the gauges going forward and reduce the influences from the forward preventing measures. Some researchers have showed their techniques to avoiding part of the above problems. Based on a series of pullout tests of geogrid, this paper gives the contrast and analysis on those techniques above, and lists the relative measures that used in these tests, especially for the gauge sticking techniques and preventive measures.
Dynamic Characteristics Test and Analysis of Long-Span Cantilevered Floor Systems in Shenyang Culture & Art Center
Authors: Jin Qiao , Sun Ze Yu , Jia Lian Guang , Wang Qiang , Yang Guang , Ma Yi , Xu Chi
Published: July 2014

For floor serviceability, stiffness and resonance are dominant consideration in the design of long-span floor systems or large-cantilever floor systems, which usually have lower stiffness and smaller dampings. In this paper, a dynamic characteristics test of long-span cantilevered floor systems in Shenyang Culture & Art Center was performed by using pulsating methods to determine the natural frequencis and the dampings, which were compared with those from the numerical modal analysis based on the Midas/gen platform. The research provides a basis for a further study of floor vibrations due to human comfort.
Finite Element Analysis on FRP Retrofitted RC Frame Structure Progressive Collapse Performance
Authors: Shen Liu Lei , Hu Qi Gao , Zhang Fan Zhen
Published: July 2014

A progressive collapse of a RC frame structure may be initiated by an event that damages one member of the structure. FRP is widely used in the field of structural reinforcement for its high strength ratio, convenient construction and corrosion resistance. In this paper, the collapse scene of a RC frame specimen with the failure mid-column in three programs has been simulated by LS-DYNA. We can infer the ultimate bearing capacity of the structure is raised about 10% (retrofitted by CFRP), 15% (retrofitted by GFRP) by comparing the results of finite element analysis.
Study on the Calculation Method for Flexural Capacity of Pre-Stressed Concrete Hollow-Core Slabs Strengthened with CFRP
Authors: Yang Xiao Pan , Yao Yong , Chu Yun Peng , Yang Tao
Published: July 2014

In recent years, the carbon fiber reinforced plastics (CFRP) has been widely used in field of structural reinforcement. To investigate the effect of different amount of CFRP strengthening pre-stressed concrete hollow-core slabs and the capacity calculation methods, test data of six slabs reinforced with CFRP at different amount were compared to obtain a available calculation formula of flexural capacity. The results showed that the bearing capacity and ductility of these specimens are significantly improved strengthened with CFRP; the proposed method of calculation is safe, simple, practical and relatively high accuracy, the calculation results coincide well with experimental results, and it has a certain reference value for the calculation of the followed studies and practical projects.
Chloride Penetration and Aging Behaviors of Surface Protected Concrete with Silicone Material
Authors: Wang Wei , Li Si Chen , Wang Hong Song , Wang Rui , Wang Wen Bin , Li Lei , Tian Qian
Published: July 2014

Concrete structures are exposed to severe environment that may cause rapid decay, shortening their service life and raising maintenance and repair costs. Chloride ions will lead to the depassivation of reinforcing steel bars in concrete which is one of the most serious problems to the durability of concrete. Then, the prescriptive methodology is not a guarantee to obtain the desired service lives of 50 or 100 years. Surface treatment is commonly used to improve the resistance of concrete to chloride erosion. Using the silicone materials to an immersion treatment can effectively block the invasion of harmful substances,the resistance of concrete to chloride penetration with surface protection with silicone materials was evaluated. The results showed silicone can improve the resistance to chloride penetration than the non-protected concretes. As a kind of polymer materials, the aging behaviors of silane is a matter of urgent concern. Hence, the aging behavior of silane coated concrete is evaluated by the test of water absorption after 1000h xenon lamp aging, which exhibits excellent anti-aging performance of silane.
Contrastive Analysis on Hinge Joint Reinforcement Measures of Hollow Plate and Deduction Design Parameter
Authors: Ni Hong Jie , Ni Ying Sheng , Tian Jun
Published: July 2014

After describing the diseases on hinge joints of the hollow plate and analyzing causes, eight reinforcement measures are put forward and introduced herein accordingly. By means of solid finite element analyzing method, the article conducts a contrastive analysis on a variety of working conditions of those eight reinforcement measures, including the hinge joint stress and transverse distribution parameter. Three ideal methods are selected to conduct further analysis on the reinforcement effect of the hinge joint stress and it is concluded that there is risk in one way steel beam hinge joint reinforcement and two ideal methods are two-way steel beam reinforcement and adding transverse diaphragm in precast phase. From the perspective of fundamental solution to hinge joints, two-way reinforcement exerts more obvious effect on the bridges in service while adding transverse diaphragm is better for newly built bridges. Making it easy for design and construction, this paper offers constructive reference for engineering practice by deducting the vertical arrangement distance of the steel beam, presenting needs to be met by the shear resistance and flexural bearing capacity after verifying reasonable distance, discussing numbers and distance of transverse diaphragm and summarizing the strain of the external prestressed steel beam.
Seismic Evaluation and Strengthening Design for a Historic Structure
Authors: Wang Hong Nan , Liu Hua Bo , Liu Jian Xin
Published: July 2014

This study focuses on one of the historic structures located in Shanghai. In order to meet modern occupants’ needs, safety inspection, seismic evaluation and strengthening design for the historic building are carried out. This building, completed in 1930s, was designed without considering the effect of possible earthquakes which cannot meet the current seismic criteria. An analytical investigation of the retrofitted structure is performed. Safety and seismic behavior are analyzed. According to the evaluation, structural performance was better understood which led to the more efficiently use of retrofit methods.
Stability Analysis for a Latticed Shell Based on ABAQUS
Authors: Ma Yun Ying , Duan Jin , Shao Hong
Published: July 2014

In this paper, the stability analysis of a single-layer latticed shell structure is presented using ABAQUS, with the geometric nonlinearity considered. The load-displacement curves are calculated according to the elastic and elasto-plastic hypothesis respectively. The ultimate bearing capacity of the structure and its conceivable damage mode are estimated. Finally, the nonlinear stability of this structure is assecced and the further suggstions for improving the structural performance are presented.
Propagating and Reconstructing Cracks in 3D in Cement-Based Materials
Authors: Liu Guan Guo , Ma Aibin , Qin Hong Gen , Zhang Ping
Published: July 2014

Three-dimensional reconstruction and quantitative calculation were performed by X-ray computerized tomography to propagate cracks in paste, mortar, and concrete specimens. Cracking could be observed, and the number and width of cracks increased with increasing strain and load. In mortar and concrete specimens, the number and width of cracks remained unchanged with increasing strain and load; however, a sudden increase in the number and width of cracks nearly destroyed the specimens. Cracks developed along the interface of the aggregate and the mortar in the mortar specimen. In the concrete specimen, cracks continued to grow through the coarse aggregate when cracking occurred along the stress direction. However, cracks developed along the interface of the aggregate and the coarse aggregate when cracking was independent of the stress direction.
The Research on Computation of Researchers Certainty Factor of Bridge's Durability Evaluation Based on the Indeterminate AHP
Authors: Chen Xiao Zhen , Zhang Xue Jun
Published: July 2014

Because of fuzziness, uncertainty of structure and researchers practical experience, it is more practical to express the relative importance of indexes with interval number. Firstly, according to researchers indeterminate judgment matrix, the upper and lower bound matrixes are formed; secondly, the similarity and the differences of the upper and lower bound matrixes of the relative importance matrix from different experts is studied by using the similarity theory of vector; lastly, certainty factor of researchers according to the upper and lower bound matrixes can be calculated, and the average value is regarded as the researchers certainty factor. The certainty factors of researchers upper and lower bound matrixes are consider together, the researchers experience is fully considered and the error from indeterminate judgment matrix to indeterminate judgment matrix is avoided. The result affords basis to calculate the weight coefficient, the research result comparing with the other method showed that the computation accuracy in this paper was very high.
Effect of Different Environments on Durability of PPF Concrete
Authors: Wang Chen Fei , Liu Jing
Published: July 2014

Different from ordinary Portland cement concrete, the Polypropylene Fiber (PPF) concrete is a new type of concrete and is made through mixing PPF into common concrete. To popularize and apply PPF concrete, this paper carried out a series of experimental study on the durability of PPF concrete under chloride environments. In the present study, three chloride environment tests were conducted on PPF concrete with various volume fraction of PPF (0,0.1%,0.3%,0.5%). The scaling of concrete, the chloride penetration in concrete and the microstructure in concrete were determined. The results indicated that the scaled mass and relative dynamic modulus of elasticity loss decrease with the volume of fiber increasing, Cl- concentration has a much higher content near the sample surface, adding 0.1% PPF into concrete has the perfect resistance of Cl- penetration. More fibers can delay the development of cracks, but that will reduce the inner density of concrete.
Studies on Mechanical Behavior of "Box Structure" Residence
Authors: Cao Yu , Meng Zhao Bo , Qiao Guan Dong , Zhao Yong Sheng
Published: July 2014

The "box structure" is a building system which was highly prefabricated and assembled. Taking the "box structure" residence as an example, the static and dynamic performance is discussed and finite element analysis software ANSYS is applied to verify "box structure" design ideas.
Reliability Assessment for the Balanced Cantilever Construction Phases of Super Long-Span Cable-Stayed Bridges with Steel Box Girder
Authors: Bai Bing , Zhang Qing Hua , Li Qiao
Published: July 2014

Balanced cantilever construction phases are of great importance for the total life cycle processes of super long-span cable-stayed bridges. For assessment purpose, a systematic study on the reliability evaluation of these phases is carried out. Taking Sutong bridge as the sample structure studied, a series of load and resistance models are then established on the basis of field measurement. Using all these achievements, a typical phase of girder segment 6# lifting is chosen for reliability evaluation. Results of the analysis show that the established models are quite representative and reflect actual random nature perfectly. Furthermore, compared with pylon and stay cables the stiffening girder seems more likely to fail in accordance with reliability index. The major failure mode of it in terms of present analysis is the stability failure due to the action of bending and axial load. Nonetheless, the components on the whole are still in a high level of reliability, which can guarantee the proceeding of construction with efficiency.
Variational Criteria for Critical Levels of Internal Energy of a Deformable Solids
Authors: Stupishin Leonid
Published: July 2014

Variational formulation of the problem of the analysis and synthesis of deformable structures are proposed. It allows studying nonlinear problems of structural mechanics from a single standpoint, from a consideration of the General variational principle.
The Research on the Stability of the Steel Tube Filled with Steel-Reinforce Concrete Subjected to Axial Compression after High Temperature
Authors: Zhao Bai Dong , Yu Xiao , Chen Pei Chao
Published: July 2014

In this paper, we do the research on the steel tube filled with steel-reinforced concrete subjected to axial compression after high temperature by changing the temperature and the slenderness ratio.The influence of the temperature and slenderness ratio on the composite column and its stability formula of the composite column after high temperature was gotten by the research.
Test Study on Size Effect Characteristics of Mechanical Performanceof Pure Bending Plastic Hinge in RC Members
Authors: Zhao Chun Xiao , Zhou Hong Yu , Jiang Hua Ge , Chen Yi Bo
Published: July 2014

Studies on size effect of plastic hinge of RC members are still rare at the present stage. This paper explores the development and failure characteristics of plastic hinge of pure bending section and analysis relevant mechanical parameters of size effect. Measured tests data show that plastic hinge equivalent length is close to the depth of beam which has no obvious size effect. However, plastic rotation capacity of plastic hinge has a significant size effect. Plastic rotation capacity decreases with section size increases if evaluate it based on ultimate load state, and increases with section size increases if evaluate it based on measured max load state.
Analysis on Switch Node Finite Element of a High-Rise Building
Authors: Huang Ling
Published: July 2014

In order to satisfy the requirement of building elevation, the setback change is carried out for the structure of a high-rise building. In order to minimize the influence of transfer story on building functions, the setback part is provided with the method of partial lapping column transfer. Lapping column transfer is a relatively fresh transfer method, which can increase the building space utilization, reduce the consumption of concrete materials, and avoid the vertical stiffness mutation of high-rise building effectively. However, the stress for lapping column transfer is rather complex, and this text makes a special analysis to the transfer story and node.
The Elastic-Plastic Time History Analysis on High-Rise Steel Structure about Main Power House of Thermal Power Plant
Authors: Liu Huan Qin , Liu Wei Bin , Wu Ruo Yang
Published: July 2014

in this paper, elastic-plastic time history analysis was carried out on the new power plant structure jointing the boiler steel frame and high-level framework workshop. Results show that main factory building structure owns rather excellent integration stiffness, good seismic performance and outstanding ability to resist lateral deformation. In addition, the interlayer displacement angle satisfies the requirement of seismic deformation calculation under severe earthquake action.