bluuebunny/crossref_metadata_2025 huggingface dataset:
Dynamic Response of a Heterotypic Concrete Filled Steel Tube Arch Bridge Subjected to Moving Vehicles
Authors: Li Yan , Huang Xin Yi
Published: June 2011

As a new type structure, the dynamic behavior of the irregular concrete filled steel tube arch bridge under moving vehicles was rarely studied. In this paper, taking the bridge crossing Yitong river in Changchun of China as an example, the dynamic response of the bridge is investigated by the self-compiling vehicle-bridge coupled vibration analysis program. The surface roughness and vehicle speed are considered in the analysis. The results show that impact factors of the bridge increase as surface roughness deteriorated; the impact factor varies obviously for the different component; the tension impact factor of the short suspender is larger than that of long ones; damping ratio of structure has little effect on the impact factors. The research conclusions can be referred in the design and assessment for the similar bridges.
Study on the Effect of Hydrodynamic Force on Deep-Water Bridges in Earthquake
Authors: Li Yue , Wang Ke Hai , Li Qian , Han Wei
Published: June 2011

On the basis of the potential fluid theory, the effect of hydrodynamic force on the dynamic response of a typical rectangular solid pier as prototype was analyzed at different water depths under two types of seismic waves. At the same time, the distribution of the hydrodynamic pressure, the action spot of the hydrodynamic force and the effect of fluid on the seismic response of the piers were analyzed in seismic waves. The results include the vibration period, the peak of displacement, shear and moment of pier are increased as the rise of water depth. The effect of fluid on the dynamic response of pier should not be ignored. The influence of different seismic loads on the distribution of hydrodynamic pressure is not identity.
Effects of Column Stiffness on the Modal Contribution to Displacement Response of Singe-Column Bent Viaducts in the Transverse Direction
Authors: Chen Liang
Published: June 2011

The influence of column stiffness on the modal contribution in the transverse direction of singe-column bent viaducts in the nonlinear range is investigated in this paper. The modal contribution ratio is introduced as a measure of the importance of a mode after a bridge yields. Three typical mathematical models of irregular singe-column bent viaducts are selected for analytical seismic response. The comparative evaluation of modal contribution ratios are carried out when columns with different stiffness yielded individually. Results show that yielding of a stiffer column affects the contribution of the fundamental mode as well as that of the higher modes significantly while the yielding of a more flexible column affects the modal contribution of the fundamental mode only.
The Precise Transfer Matrix Method for Dynamic Characteristic Analysis of Curved Box Beams
Authors: Sun Jian Peng , Li Qing Ning
Published: June 2011

The dynamic characteristic as one key feature determines the earthquake response and seismic performance of structures.Curved box beams occur coupling of flexural and torsional modes,which companied with warping.Based on the precise transfer matrix method,precise transfer matrixs for solving the natural frequencies and modes of curved box beam out plane have been derivated.The analysis of vibration characteristics of single-span curved box beam with pinned-pinned ends has been done. Example shows that the precise transfer matrix method is a simple and effective method for dynamic characteristic analysis of curved box beams.
Analysis of the Action Blast-Induced Vibration Generates on Structure
Authors: Yan Zhi Xin , Cai Han Cheng , Jiang Ping , Wang Hou Yu
Published: June 2011

Blast-induced seismic wave, which is an instantaneous, complicated wave, is different from natural seismic wave. It has characteristics such as high frequency, fast vibration intensity attenuation rate with distance increasing, short duration, generally small hypocenter energy and short wavelength of blast-induced seismic wave, etc. In this paper, on the basis of motion equation of the structural system and through rigorous mathematical induction under blast-induced seismic action, the energy transfer (input) and transformation equations of single freedom structural system and multiple freedom structural system are obtained and carefully studied. Through using stress-strain connection and the transmission characteristics of wave in different medium, the author explored the mechanism and time-space process of the action blast-induced seismic vibration has on structure. Meanwhile, the author also analyzed the impacts blast-induced seismic vibration characteristics and structure dynamic characteristics have on structural reaction. Furthermore, the mechanism of action blast-induced seismic vibration has on structure is revealed.
Spatial Coupling Vibration of Vehicle-Track-Bridge System due to Different Track Irregularities
Authors: Zhang Yuan
Published: June 2011

Track irregularity is one of the most important factors that induce vehicle-track-bridge coupling vibration. In this paper, spatial model of vehicle- track-bridge system is established. The track irregularity sample in time domain are established by power spectrum density and taken as the exciting source to analyze the spatial coupling vibration of vehicle-track-bridge system. By comparing the vibration responses of the model excited by vertical profile irregularity and the model excited by four different irregularities, the change of track irregularities have mostly influence on the vibration of the parts above the rail and nearly no influence on the parts under the rail and bridge.
Discussion on the Influencing Factors of Deflection-Span Ratio at Failure in Prestressed Concrete Hollow Slab
Authors: Cui Xiu Qin , Zhao Hua Wei , Zhao Nan
Published: June 2011

The numerical analysis method is applied to simulate the whole process of bending. Keeping the section dimensions and the types of loads constant in prestressed concrete hollow slab with mid-strength spiral-rib steel wire, span-depth ratio, reinforcement ratio, strength of concrete, strength of steel bar and stretching control stress are analyzed and compared. The influence of span-depth ratio, reinforcement ratio, strength of concrete, strength of steel bar, and stretching control stress on deflection-span ratio at failure of prestressed concrete hollow slab is discussed by numerical simulation.
High Speed Photography System of Vehicle/Barrier Crash Testing Laboratory
Authors: Wang Yan Zhao , Lei Mu Xi , Lei Zheng Bao , Ling Jian Jun
Published: June 2011

Based on the characteristic of the shortest time, no repetition and a huge financial loss at the car crash test, High Speed Photography system plays a strictly utilitarian role. This paper mainly analyses High Speed Photography system, from the perspective of a single system we can prove the feasibility about new crash test laboratory, meanwhile, this paper describes parameters, principle of HG-100K high speed camera adopted by our laboratory, at the same time, the application of the camera is analyzed generally in the experiment of car crash test in order to proving its practicability. High speed photography system is described further in the experiment of the car crash test.
The Study for the Electronic Control Technology of the Electric Power Traction System in the Bridge/Shipping Crash Testing Laboratory
Authors: Zhang Xiao Yuan , Lei Mu Xi , Lei Zheng Bao , Ou Bi Feng
Published: June 2011

The electric power traction system in the Bridge/Shipping Crash Testing Laboratory, is the foundation of the crash test between the shipping and the bridge. In order to make sure the process more quickly, stably, accurately, centralized-control method has been applied in the electric power traction system of the Bridge/Shipping Crash Testing Laboratory in The Changsha University of Science and Technology, so the test flow has been controlled and finished automatically, the test data could be collected and recorded automatically, safety alarm, protect automatically and the history data could be recorded on the real-time, the test report form could been formed automatically and the manage function will be worked and so on. The problem of complexity of the test flow, the difficulty of the induction about the logic relationship, the strong electromagnetism interfere in the big current equipment, the machine shock is strong and so on would be solved, the traction system in the crash test would be made more real and mature.
Overall Design Method for Large Structure Crash Testing Laboratory
Authors: Lei Zheng Bao , Zhang Xiao Yuan , Lei Mu Xi
Published: June 2011

In order to overcome the shortcoming in the large structure crash test such as shipping-bridge crash testing, an indoor electric traction large structure crash testing laboratory had been developed independently on the basis of the success experience in the national vehicle crash testing technology, the available traction track is 216 meters long, and the shipping-bridge crash testing, vehicle-bridge crash testing, vehicle crash testing, vehicle rolling testing, vehicle-barrier crash testing, vehicle-traffic facilities crash testing and so on could be carried out in the laboratory, the maximum traction mass could reach 18000kg, and the maximum crash speed could reach 120km/h, therefore, a effective design method for large structure crash testing laboratory had been formed. The result shows that the all meet the requirement of the pre-expected purpose.
Research on Dynamic Responses of Subway Stations to Explosive Loads
Authors: Kong De Sen , Zhang Wei Wei , Zhang Qiu Hua , Meng Qing Hui
Published: June 2011

Subways have found wide application in many countries relying on their unique advantages. Urban subway stations usually have a dense crowd and a closed environment; therefore, once the terrorist blast attack occurs, people’s life and property security is seriously threatened. For the purpose of avoiding heavy damage (especially continuous collapse) of subway stations suffering from terrorist blast attack, numerical model of a subway station was established with the software LS-DYNA3D, and the internal explosion was analyzed and studied; subsequently, influential effect of blast shock wave on the subway station was obtained. The research results can provide basis for emergency countermeasures establishment of the subway structure coping with terrorist blast attack.
Analysis on Vehicle-Bridge Coupled Vibration of a Rigid-Frame Arch Bridge Based on Measured Road Roughness
Authors: Han Wan Shui , Yuan Su Jing , Wang Bing
Published: June 2011

Firstly, synchronous field measurements were carried out for the road roughness of the left and right wheels to obtain the roughness profile using a high speed laser roadway testing vehicle. Secondly, programming idea of multi-girder vehicle-bridge coupled vibration analysis module was presented briefly. Finally, a three-axle heavy truck crossing a rigid-frame arch bridge was taken as an example, detailed comparing and analyzing was carried out for the influence on the dynamic responses and spectrum characteristics of the vehicle-bridge system from three excitation cases which include using measured road roughness corresponding respectively to left and right wheels, using measured road roughness of left wheels and right wheels simultaneously. The analysis shows that when the differences in road roughness between left and right wheels are significant, the responses computed with inconsistent excitation is smaller than that with both of the latter two excitation cases, and there are some differences between the vertical contact forces of wheels and the spectrum characteristics of the vehicle-bridge system.
Coupled Vibration Analysis of Vehicle-Bridge System for Yujiang River Bridge on Nanning-Guangzhou Railway Line
Authors: Shan De Shan , Cui Shen Gai
Published: June 2011

Taking Yujiang River Bridge on Nanning-Guangzhou railway line as study background, the refined numerical simulation model of whole vehicle and whole bridge system for coupled vibration analysis is set up. The dynamic analysis model of the cable-stayed bridge is established by finite element method, and the natural vibration properties of the bridge are analyzed. The German ICE Electric Multiple Unit (EMU) train refined three-dimensional space vehicle model is set up by multi-system dynamics software SIMPACK, and the multiple non-linear properties are considered. The space vibration responses are calculated by co-simulation based on multi-body system dynamics and finite element method when the ICE EMU train passes the long span cable-stayed bridge at different speeds. In order to test if the bridge has the sufficient lateral or vertical rigidity and the operation stability is fine. The calculation results show: The operation safety can be guaranteed, and comfort index is “excellent”. The bridge has sufficient rigidity, and vibration is in good condition.
The Three-Phase Boundary Dynamic Variation of the Porous Gas Electrode
Authors: Zhu Mei , Xu Xian Zhi
Published: June 2011

In order to observe the three-phase boundary (TPB) variation of the porous gas electrode, a new laying style of the porous gas electrode was proposed. Two electrodes with different ingredient were taken in the experiment under the same condition to testify that there are three distinct stages of the TPB dynamic variation.Each stage has its own apparent phenomenon and the variation time of each stage is different for each electrode. The relationship between the electric conductance and the TPB variation of the electrode were also analyzed by the theoretical calculating formula. The result showed that the internal resistance increases as the decrease of the electric conductance created by the TPB variation. The research above illustrated this laying style of the porous gas electrode can be effectively used to observe the TPB dynamic variation.
Theoretical Research of the Active-Type Dynamic Vibration Absorbers
Authors: Chen Zi Li , Ma Ao Ling , You Xiao Liang , Shi Li Qun
Published: June 2011

Active-type dynamic vibration absorbers (ADVA) is a kind of damping system, installed an actuators in the dynamic vibration absorbers (DVA). According to the actual needs, vibration energy of the structure is transferred to vibration absorbers actively in the process of structural vibration for the effect of external excitation. Therefore, the energy is decayed or transferred quickly and the structural vibration is controlled. If the nature frequency of additional system is the same as external excitation frequency of the original system, actuators doesn’t start and the whole system behaves the property of DVA (passive damping) .Otherwise, actuators starts, which makes the energy of original structure transfer to the vibration absorbers actively, achieving the purpose of energy consumed and vibration reduced. In this paper the concept of ADVA is proposed, and the working principle of ADVA is theoretically analyzed, furthermore the expressions of the system vibration response and active control coefficient are deduced. The curves of active control force and structure amplitude against incentive frequency are plotted respectively by examples.
Dynamic Response of Simply-Supported Curved Girder Bridges due to Vehicles
Authors: Bu Jian Qing , Li Gen Wang
Published: June 2011

The purpose of this paper, for which a finite element bridge model with 7 degrees of freedom per node and the 1/4 vehicle model with six parameters were established, is to analyze the dynamic response of curved girder bridges under vehicular loads. In the numerical simulation, the vibration characteristics of simply-supported curved girder bridge are analyzed, and the effect to the impact factors were also studied for different radiuses of curvature, eccentricities, ratios between bending and torsion stiffness, and vehicle speeds. The simulated results show that not all the first 5 natural frequencies increase with the variation of radius of curvature. The impact factor variations of vertical deflection and torsion angle are not uniform when parameters changed, and the impact factor of torsion angle would be much larger than that of vertical deflection under the same conditions.
Damage Detection Analysis of Reinforced Concrete Simple Beams Based on Three Dimensional Curvature Mode
Authors: Yao Ji , Wu Jia Quan , Cao Liang , Cheng Xiao Yu , Ma Kun
Published: June 2011

The damage detection based on curvature mode was discussed in this paper, a three dimensional reinforced concrete simple beam model was established by finite element software, two models of before and after damage were compared also. The results showed that, before and after damage, the natural frequency, vibration modes and displacement modes had small difference, yet the curvature modes of model had great change in the location of damage.
An Integral Equation Method for Free Vibration of Circular Plate with Concentrated Mass at Arbitrary Positions
Authors: Cheng Gang , Cheng Quan , Wang Wei Dong
Published: June 2011

The paper concerns on the free vibrations of circular plate with arbitrary number of the mounted masses at arbitrary positions by using the integral equation method. A set of complete systems of orthogonal functions, which is constructed by Bessel functions of the first kind, is used to construct the Green's function of circular plates firstly. Then the eigenvalue problem of free vibration of circular plate carrying oscillators and elastic supports at arbitrary positions is transformed into the problem of integral equation by using the superposition theorem and the physical meaning of the Green’s function. And then the eigenvalue problem of integral equation is transformed into a standard eigenvalue problem of a matrix with infinite order. Numerical examples are presented.
Application of Earthquake Damage Forecast with PKPM Software on Important Buildings in Xichang
Authors: Li Qiao Yan , Yu Gai Hua , Guo Xiao Yun
Published: June 2011

In this paper, important buildings of different structure in Xichang are calculated by using the powerful design software PKPM. First, the drawings of the buildings are simplified and the structure forms are input the computer in PMCAD software interface to make model, and the comprehensive seismic capacity index of floors or the story drift angle are calculated. Then, according to the judging principle, the earthquake damage level is gotten.
Finite Element Analysis and Simplified Model of Searing Bottom Concrete for Steel Cofferdam
Authors: Yang Mei Liang , Xia Gui Yun , Zhong Fang Ping
Published: June 2011

Steel cofferdam is an advanced technology for high pile cap construction in deepwater foundation. Using Xiangjiang river bridge of Changsha-Xiangtan expressway as engineering background, we use software ANSYS to analyze the stress states of sealing bottom concrete layer of steel cofferdam of this bridge, and obtain some results of deformation, direct stress, principal stress, shear stress and equivalent stress. At the same time, a fixed-ends beam under uniform pressure is used to simplify the analytical model, and results show that this model can give relatively correct stress state with proper precision, but give poor deformation state. As for the design of steel cofferdam, engineers are mainly interested in the stress results. So the simplified model can be used in the design and analysis procedure.
Damage Detection through Changes in Frequency Base on Reinforced Concrete Beam
Authors: Chen Xiao Yu , Ma Kun , Wu Jia Quan , Guo Xiang
Published: June 2011

The detection of the structur[1]al damage by the method of changes in frequency is limited in detecting single location of the structural damage. This paper try to solve the problems of how to detect the multi-location of the structural damages and the corresponding severity. Therefore, a simple supported large-size reinforced concrete beam in different damage conditions is simulated by the finite element software-ANSYS. Cruves of frequency changes ratio can be maped by the date of the simulation, the locations of damages and corresponding severity can be detection by judging the superposition of the intersections of many curves of the frequent changes ratio. The simulation results demonstrate that the method proposed in this paper cannot only detection the multi-locations of the structural damages accurately, but also analyze the severity of the structural damages qualitatively. Corresponding author: Makun, School of Science, Kunming University of Science and Technology, makun_box@sina.com
FEM Simulation of Deformation Field during the Sheet Metal Forming
Authors: Li Bin , Zhang Hong Tao , Wang Hong , Chang Jia Dong
Published: June 2011

In this paper, computer aided engineering of some innovative sheet metal forming processes is reviewed. Because of the complexity of this process, numerical simulation becomes necessary for its analysis. The deformation behavior of sheet metal in forming process is numerically simulated using quasi-static implicit and explicit finite element codes. The main advantages of the finite element method are: the capability of obtaining detailed solutions of the mechanics in a deforming body, namely, stresses, shapes, strains or contact pressure distributions; and the computer codes, can be used for a large variety of problems by simply changing the input data.
Practical Method for Concrete Creep Calculation Based on ANSYS
Authors: Ge Jun Ying , Zhang Hao
Published: June 2011

For concrete bridge, creep effect throughout the whole process that from construction to the entire service life, and it has large effect on internal force and deformation of the bridge, therefore, accurate calculation of the effect is very meaningful. In this paper, we put up the detailed implementation calculation in the ANSYS based on “Age-Adjusted Effective Modulus Method (AEMM)”. Finally the author verified by the example.
An Improved Finite Beam Element Method for Calculating Lateral Displacements of Piles Subjected to Inclined and Eccentric Loads
Authors: Yang Ming Hui , Ou Bi Feng , Lu Shang Wu
Published: June 2011

This study presents an improved finite beam element method developed to calculate lateral displacement of pile subjected to eccentric and inclined loads. The relationships between the moment and shear to the lateral displacements of pile are derived from the mechanical deferential equation of the pile by taking into account the P-Δ effect of the pile due to geometric nonlinearity, and the stiffness of the pile element discretized into the finite beam elements is obtained, followed by solving, lateral displacement of pile is deduced by the improved finite beam element equations. By comparing to results of a model test on piles under eccentric and inclined loads, it is shown that the improved finite beam element method accurately predicts the pile’s lateral displacements.
Nonlinear Analysis of Reinforced Concrete Core Walls Based on Three-Vertical-Line-Element Model
Authors: Li Kun , Shi Qing Xuan
Published: June 2011

Three-vertical-line-element model and uniaxial spring model were adopted to simulate walls and beams. Based on the existing experiment data, numerical simulation is used to analysis the nonlinear behavior of reinforced concrete core walls. The analysis also considered the influence of relevant parameters on the elasto-plastic in core walls structure. Results from the simulation anlysis match well with those from the tests. It is shown that the higher axial compression ratio enhance the bearing capacity; the ratio of height to width has effect on the bearing capacity, deformation performance and the failure mode; the decrease of span-depth ratio of coupling beam reduce ductility and deformation ability of the core walls; the imposed horizontal angle has important effect on the overall space behavior of reinforced concrete core wall.
Exact Expression of Element Stiffness Matrix for a Tapered Beam and its Application in Stability Analysis
Authors: Meng Li Xia , Lu Nian Li , Liu Shi Ming
Published: June 2011

The exact stiffness matrix of a tapered Bernoulli-Euler beam is proposed, whose profile is assumed linear variation. Classical finite element method to get stiffness matrix through interpolation theory and the principle of virtual displacement is abandoned. Starting from the governing differential equation with second-order effect, the exact stiffness matrix of tapered beam can be obtained. In the formulation of finite element method, the stiffness matrix derived has the same accuracy with the solution of exact differential equation method. As is demonstrated in the numerical examples, the presented method can yield, in a very efficient way, accurate results for single tapered beam or structures consisting of tapered elements.
Finite Element Analysis on Mechanical Behavior of Column Underpinning Joints for Building Moving
Authors: Yue Qing Xia , Zhang Xin
Published: June 2011

The building moving has more than 100 years’ history. In the building moving, the design of the underpinning joints is one of the key problems. As to the frame structure, the most widely used method is the double beam underpinning system. Our research group has conduct 16 underpinning joints tests considering the different influential factors to study the mechanical performance of it. This paper first introduces the experiment briefly. And then make finite element analysis on the mechanical behavior of the column underpinning joints using the software ABAQUS as the platform. In the finite element analysis, the solid element is adopted and the master-slave contact surface is used to simulate the interaction between the column and the underpinning beams. The results show that the failure of the moving-beam is ahead of the coupling-beam and the bending-shear failure occurred in the moving-beam. As to the interface between the column and the beam, the lower part of the contact failed and the gaps can be seen. From the analysis results, the contact stress on the column is not uniformly distributed and larger in the upper part of the contact surface which is accord to the test results.
Responses of Concrete-Filled Cold-Formed Square Hollow and Double-C Steel Stub Columns under Cyclic and Repeated Loadings
Authors: Hansapinyo Chayanon
Published: June 2011

This paper presents an experimental study on the response of 18 concrete-filled cold-formed square hollow and double-C steel stub columns under cyclic and repeated loading. The test parameters were (1) infilled materials, i.e. No fill, concrete infilled and mortar infilled columns (2) cross sectional shape and dimension. The effect of lips in double-c section as inside stiffeners is presented. The cyclic tested results indicate the infilled columns possess higher bearing capacity, especially infilled materials with higher strength and non-compact section columns. However, there is no different in ultimate tensile. Moreover, the infilled columns showed larger area under post-yield hysteretic loops leading to better seismic performance. Failure of columns was modified in which the failure mode was shifted from the in-outward local buckling into the outward manner, consequently resulted to higher bearing capacity.
Experimental Investigation on Shear Property of RC Beams with Aramid Fiber Mesh Stirrups
Authors: Wu Er Jun , Xing Jian Long , Zhu Zhao Quan
Published: June 2011

This paper develops a new-typed high-durability RC structures in which the steel stirrups are replaced by mesh stirrups weaved with soft high performance fiber belt. The experiments are carried out to investigate the shear property of six beams with soft aramid fiber mesh stirrups and one common RC beam and the results show that the failure state in the slope sections of the RC beams with fiber belt mesh stirrups is similar to the common RC beam. It was also found the shear property of beams with lean fiber mesh stirrups is better than that with vertical and horizontal mesh stirrups, and with the high-elastic- modulus fiber stirrups better than the low-elastic-modulus’s. In addition, the distributions of fiber stirrups strain at slope section are also observed. Based the experimental results, a model for beams with fiber mesh stirrups was established and the formula of shear bearing capacity was suggested.
Towards the Harmonious Mating for Genetic Algorithms
Authors: Huang Fa Liang
Published: June 2011

Genetic algorithms (GAs) have achieved lots of success in various applications, but the problem to balance exploration and exploitation of population is still up in the air. In this paper, we propose a variant of genetic algorithm with mating operator GASF to alleviate the problem;GASFmeasures the mating attractiveness of individuals from four aspects: gender, age, similarity and fitness. Individuals are assigned gender to facilitate mimicking human reproduction, and contributions of age, similarity and fitness to the attractiveness are respectively quantified and self-adaptively adjusted. Experimental results indicate that the proposed approach can achieve competitive performance with improved convergence.
Six-Dimensional Chaotic System and its Circuit Implementation
Authors: Zhu Jian Liang , Wang Yu Jing , Kang Shou Qiang
Published: June 2011

In order to generate complex chaotic attractors, a six-dimensional chaotic system is designed, which contains six parameters and each equation contains a nonlinear product term. When its parameters satisfy certain conditions, the system is chaotic. By Matlab numerical simulation, chaotic attractor and relevant Lyapunov exponents spectrum can be obtained, which validates that the system is chaotic. And, time domain waveform and power spectrum are shown. Finally, the implementation circuit of this system is designed, and circuit simulation can be done by using Multisim. Circuit simulation result is identical to system simulation completely. The circuit has a practical significance in secrecy communication and correlative fields.
Research on Bullwhip Effect Considering Allocation Mechanism in Supply Chain
Authors: Li Zhuo Qun
Published: June 2011

Commonly, an upstream member in a supply chain provides productions or resources for many downstream members. When the sum of retailers order quantities is beyond suppliers' inventories, suppliers might apply order allocation mechanism to solve the difficulty. The allocation mechanism is not considered in most of previous studies on the bullwhip effect. This paper develops the supply chain simulation software based browser/server technology, which can build tree-shape supply chain structure considering allocation mechanism. Two experiments are designed and implemented in order to isolate the effect of different order allocation mechanisms on bullwhip effect. The studies show that BWV differs from allocation mechanisms. For three types of supply chain members, the change tendencies of BWV with two allocation mechanism are similar. The paper also demonstrates that distributors have effect more obviously on bullwhip effect than other two roles with different allocation mechanism.
An Efficient Subcarrier Power Allocation Algorithm in Cognitive WSN
Authors: Xu Xiao Rong , Zhang Jian Wu , Zheng Bao Yu , Yan Jun Rong
Published: June 2011

In Cognitive Wireless Sensor Network (C-WSN), spectrum utilization and energy-efficiency are both significant items for the whole network. Interference between Primary User (PU) sensor and Secondary User (SU) sensor should be eliminated in order to realize spectrum sharing. In this paper, mathematical model of multi-carrier power allocation in cognitive OFDM is constructed. Multi-carrier power allocation based on rate adaptive criterion is proposed under the constraints of SUs’ power control. An efficient subcarrier power allocation algorithm based on adaptive water-filling is proposed. The improved algorithm could directly determine the sub-carriers that do not require additional power injection by rough estimation of water levels. Computational complexity of proposed algorithm could reduce rapidly. Meanwhile, theoretical derivation and numerical results both indicate that, with the proposed power allocation algorithm, SU’s spectral efficiency is superior to other traditional water-filling schemes, and the algorithm also has some adaptive features for practical implementation in C-WSN.
A Network Expense Model for Improving P2P Data Distribution Schemes
Authors: Chen Jian Hong , Xi Jian Qing , Shao Liang
Published: June 2011

Nowadays P2P is the premier data distribution technology which tops Internet traffic flow chart. It becomes more and more important to optimize the data flow of P2P traffic. However, there is no general standard for measuring which data distribution scheme is better. A network expense model is proposed for this purpose. By observing the data flows which are produced by P2P, we can calculate the network expense of any data distribution scheme. Now there is a unified standard for evaluating the influence of different data distribution schemes to the network. According to this model, the network expense of a few typical P2P data distributions scheme over the Internet is calculated. Judging from the results, a topology-aware P2P can generate more balanced flows to save the bandwidth of backbone network. Network expense model provide a fundamental tool for optimizing the P2P data distribution.
Seismic Elastic-Plastic Analysis on Outer-Jacketing Mega Frame for Story-Adding by IDARC-2D
Authors: Sun Xu Jie , Cao Jian Ping , Zheng Wen Zhong
Published: June 2011

To make sure the seismic behavior of outer-jacketing mega frame for storey-adding, a low-cyclic loading test of prestressed concrete beam and a pseudo-static test of Mega frame were analyzed by elastic-plastic finite element program IDARC2D, compared with the test results, skeleton hysteretic curves and restoring force models of structural member were determined. They were used in IDARC2D to study the seismic behavior of mega frame for storey-adding. Some structures designed complied with the Code for Seismic Design of Buildings (GB50011-2001) and correlative literatures about collapse, these structures were reanalyzed after enhancing their seismic measures suitably, collapse were avoided. They are: the main frame of outer-jacketing mega frame in the zone of seismic fortification intensity 8 conforming to seismic grade 1-st, the height of mega frame under 50m conforming to seismic grade 2-nd and that over 50m conforming to seismic grade 1-st in zone of seismic fortification intensity 7. Research achievements will provide reference to engineering application of this structural system.
Optimal Trajectory Planning for Robot
Authors: Piao Song Hao , Zhong Qiu Bo , Wang Xian Feng , Gao Chao
Published: June 2011

A gait control system is designed for walking a slope movement according to the features of biped robot, Two BP networks are introduced into train the walking trajectory of robot and the optimal trajectory is generated by the new evolutionary approach based on particle swarm optimization. Additionally, online environmental information is collected as neural network input, and necessary joint trajectory is output for the movement. Simulations with Matlab and experiments on NAO humanoid robot testify the efficiency of the method.
Research of Object Recognition Algorithm Based on Variable Illumination
Authors: Piao Song Hao , Zhong Qiu Bo , Wang Shu Ai , Wang Xian Feng
Published: June 2011

The robot vision system is the critical component of the soccer robot, in football competition, robot perceive the most of the information from the vision system. Because of the variable illumination conditions, the traditional image segmentation method based on color information is not satisfactory. Based on the color information and shape information of the object, this paper proposes a object recognition algorithm that combine color image segmentation with edge detection. This algorithm implement image segmentation use color information in the HSV color space obtain the pixel of the object, then use this pixel implement edge detection to recognize the object. Experiments show that this algorithm can recognize the object exactly in the different illumination conditions, satisfy the requirement of the competition.
Research on Simulation about a Class of Complex Adaptive System
Authors: Shao Yan Hua , Xu Sheng Nan
Published: June 2011

In accordance with the limitation of the simulation research on a class of complex adaptive system, attempts to break traditional mathematical modeling framework and substitute new research methods for the latest achievements of complexity science and the interdisciplinary approach in the paper. Try to apply complex adaptive system theory to the simulation research on a class of complex adaptive system by establishing new research method and system. The computer-based model is able to observe and forecast the system behavior, and reflects combination complexity during the evolution. The research provides investors a reference for decision-making, at the same time, has a certain referential significance for the study of similar complex systems in terms of researchers.
Ammonia Detection by Dye Immobilized Microstructured Optical Fiber
Authors: Peng Li Rong , Yang Xing Hua , Yuan Li Bo , Zhao En Ming , Li Le , Luo Shen Zi
Published: June 2011

An optical ammonia probe was fabricated based on Microstructured Polymer Optical Fiber (MPOFs) modified by eosin doped silica gel films.The structure of this probe was based on microstructured polymer optical fibers with microholes and these microholes could be used as the substrate of sensing materials and minor reaction pools. The sensing properties of the optical fiber sensor to gaseous ammonia were investigated at room temperature. The sensing probe showed different fluorescence intensity at 576 nm to different concentrations of trace ammonia in carrier gas of nitrogen. The response range was 20-350 ppm, with short response time within 600 ms.
An Improved P-SVM Model for Patent Application Filings Prediction
Authors: Xu Sheng , Qi Tao
Published: June 2011

The patent applications filings (PAF) are complex to conduct due to its nonlinearity of influenced factors. A novel way about nonlinear regression modeling of PAF with the potential support vector machines (P-SVM) is presented in this study. Grey theory is a truly multidisciplinary and generic theory that deals with systems that are characterized by poor information. However, the application combining grey system theory and P-SVM for PAF prediction is rare. In this study, a grey potential support vector machines with genetic algorithms (GPSVMG) is proposed to forecast PAF. In addition, Grey system is used to add a grey layer before neural input layer and white layer after P-SVM layer. Genetic algorithms (GAs) are used to determine free parameters of P-SVM. The experiments show that the GPSVMG model is outperformed not only single grey model but also SVM with genetic algorithms (SVMG) model and potential support vector machines with genetic algorithms (PSVMG) model. So, PAF prediction based on GPSVMG is of validity and feasibility.
Research on Pyrolysis Analysis and Morphology Change of Waste Computer Mainboard
Authors: Jiang Hui , Chen Hai Yan
Published: June 2011

Pyrolysis analysis of waste computer mainboard was carried out at heating rate of 10 °C /min, 20°C/min and 25 °C/min in nitrogen atmosphere. The thermogravimetric analysis result shows that the weight loses change in three steps: the curve of TG is smooth from room temperature to 300°C in the first step, which possess about 1 percent of the total weight. The weight loses abruptly increase from 300 °C to 450 °C in the second step, and the curve of TG recoveries to be smooth at the temperature of 450 °C, that is the third step. There is an evident exothermic peak and an evident endothermic peak during the pyrolysis process, the exothermic peak is due to the thermal decomposition of waste computer mainboard, the endothermic peak is related to the melting of copper. At the same time the pyrolysis process make the surface morphology and elevation morphology change. The experimental study provided valuable basis for the industrial recovery of waste computer mainboard.
Detection of Laser Direction and Wavelength Using the Unitized Wedge
Authors: Zhang Li
Published: June 2011

A novel detection method of laser direction and wavelength synchronal is fabricated by combining the four wedges and CMOS array camera. The unitized wedges we designed are composed of the four same wedges, and the joint is non-transparent. When the laser incident in the random direction, we calculate the distance of interference fringes in the four wedges, and deduce laser direction and wavelength. By simulation, it generates the drawings of optical path difference and the mini-distance when the minimum identification angle is 1o. In experiment, when we choose the angle of wedge is 0.01rad (≈0.57o), the distance of interference fringes is 10μm, larger than 8μm in CMOS array camera, so the interference fringes with the 532nm laser can be detected.
A Novel Variable Step-Size Algorithm for Implicit Integration
Authors: Zou Jian Xiao , Zhou Cui Yun , Zheng Gang
Published: June 2011

A new variable step-size numerical algorithm for implicit integration is discussed in this paper. The scheme for increase and decrease of step size is discussed according to the difference of output variable value. The next step size is calculated through the variable coefficient method and the limitation rules. The convergence and accuracy are testified by the simulation result. Compared with the common used ode45 algorithm, the algorithm has more computing efficiency with a certain calculation precision.
The Missile Fault Diagnosis Expert System Based on GA-BPNN
Authors: Zou Jian Xiao , Zhang Yao , Zheng Gang
Published: June 2011

To improve the performance of fault diagnosis expert system based on ANN IN fields of convergence speed, locally optimal solution and the low accuracy, an missile fault diagnosis expert system based on GA-BPNN is proposed in this paper. The genetic algorithm (GA) is adopt to optimize the weight and threshold of matrix while BP neural network realizes the non-linear map relations between failure feature and failure cause. The simulation results indicate that the method proposed in this paper significantly increase the convergence speed and globally optimal solution of neural network, the fault diagnosis accuracy of expert system for a missile has been improved also.
The Experimental Study on Infiltrating Characteristics of Different Mediums
Authors: Liu Hong Fang , Qian Tian Wei , Chen Hao
Published: June 2011

According to the column experiment of loess and loess-quartz mixed mediums of different proportion, we studied the changing rule of the wetting front ,infiltration capacity, and infiltration rate with time. The wetting fronts of the three mediums followed power relation against time, the correlation coefficients were all above 0.99.The fitting formula based on the relationship between wetting front and the time, and the correlation coefficients were above 0.97. With the proportion of quartz sand in mixed samples increased, the infiltration coefficient and infiltration rate increased.
Functional Safety Management in Microcontroller Design and Development Process: the Case of Safety-Critical Vehicle Systems
Authors: Zhou Bing Hai , Zhai Zi Qing
Published: June 2011

Safety is always the key issue in automotive industry. The adoption of hi-tech automotive applications requires not only the development of reliable electrical/electronic/programmable electronic (E/E/PE) systems and communication protocols, but also an evolution in functional safety process management. ISO/WD 26262, the adaption of IEC 61508 for road vehicles, provides guidelines and standardized measurements for functional safety. This paper discusses how automotive microcontroller suppliers can deal with this new challenge by integrating functional safety management into product design and development. An ISO/WD 26262-compliant functional safety management flow is proposed, with specifications on techniques of corresponding safety assessment.
Facial Expression Recognition Using Improved Canonical Correlation Analysis
Authors: Gang Lei , Yong Zhang
Published: June 2011

Canonical Correlation Analysis (CCA) is a powerful multi-mode feature fusion method, but in traditional CCA, the optimization function is to find a pair of projections which make the mappings of the observations of the same pattern have the maximum correlation. It is an unsupervised subspace learning algorithm. This paper, we propose a Improved Canonical Correlation Analysis (ICCA) method which improves the optimization function by adopting the supervised relationships of the patterns belong to the same class. Our proposed algorithm is validated by the experiments on Jaffe facial expression database. Be compare with other methods, the recognition rate of our method is far higher than the PCA algorithm which only adopts single-mode image features and the traditional multi-mode CCA feature fusion algorithm.
An Application Anti-Attack Model
Authors: He Hong Jun , Luo Li , Wang Yang , Duan Zhi Peng , Fang Zhi He , Zhang Wen Zheng
Published: June 2011

With the development of computer technology and network application, the safety of application has become one of the most important research problems in the field of information security. Firstly, the paper analyzes malicious attack approaches for applications. Secondly, this article proposes an application anti-attack model (AAM), and further presents the formal description of the model. Finally, this paper represents its good security properties and proves them.
Cooperation, Competition and Independent in Channel Relationships: An Empirical Study Based on E-Commerce
Authors: Tang Xiao Fei , Wang Yue , Zheng Jie
Published: June 2011

In e-commerce conditions, the relationships between channel members are more complex, including competition, cooperation and independent. With the help of Deutsch’s goal interdependence theory, we studied the perceived goal interdependence between distributors with suppliers, which will lead to the different channel benefits and results. This study improved that the distributors would put in more commitment and trust, to gain more economic benefits and occupational well-being, if they believed their goals were positively associates with the supplier’s objectives.
Research on Smooth Support Vector Regression Based on Hermite
Authors: Ren Bin , Cheng Liang Lun
Published: June 2011

Polynomial smooth techniques are applied to Support Vector Regression model by an accurate smooth approximation which is offered by Hermite Interpolation polynomial. We use Hermite Interpolation to generate a new polynomial smooth function which is proposed for thefunction in ε-insensitive support vector regression of interpolation functions. Their important property is discussed. It can be shown that the approximation accuracy and smoothing rank of polynomial functions can be as high as required.
Data Dissemination Scheme Research in Opportunistic Sensor Networks
Authors: Shen Hai Lan , Chen Zhi Gang , Chen Zai Liang
Published: June 2011

This paper mainly discusses the performance of three typical data dissemination schemes in opportunistic sensor networks, which include rumor spread protocol, direct dissemination protocol and the protocol based on evolvement strategy. The main idea of the protocol based on evolvement strategy is that in the process of data dissemination, those nodes with higher dissemination validity are dynamically to substitute the node with lower dissemination validity. This paper makes detail theory analysis on the performance of these protocols. The performance of these protocols also is compared with simulation experiments further more.