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Indicial Functions Algorithm and Time Domain Flutter Analysis of Bridges Based on ANSYS Program Qing Qianzhi，Zhang Zhitian，Xiao Wei，Zhu Mingkun 2012, 31(2): 173-178.  DOI: 10.3969 /j.issn.1674-0696.2012.02.01 Abstract ( )   PDF (450KB) ( )   On the basis of sectional flutter derivatives，the indicial functions are firstly adopted in this literature to simulate the self-excited aerodynamic forces of bridge girder section，and，of which the simulation veracity is inspected． Then the recursive algorithm of bridge section self-excited aerodynamic forces，which is indispensable in the dynamic finite element analysis procedure，is deduced． Based on simulated self-excited aerodynamic forces，the time-domain flutter analysis is achieved in ANSYS in virtue of the embedded APDL language wherein． At last，a numerical example — a simple supported beam is selected to verify this method in time-domain using ANSYS software． Numerical example is in good accordance with what reported in the listed references． What presented in this paper shows it is feasible to conduct the time-domain investigation of aerodynamic stability of a bridge based on secondary development of the ANSYS program，which is capable of improving the efficiency of bridge flutter analysis or flutter-buffeting analysis，reducing the risk of algorithmic error or careless omissions involved in self-developing large software． References | Related Articles | Metrics

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Nonlinear Seismic Response of Continuous Rigid Frame Bridge in Longitudinal Direction Zeng Jinming，Zhu Dongsheng，Zhang Yongshui，Zhang Jie 2012, 31(2): 179-183.  DOI: 10.3969 /j.issn.1674-0696.2012.02.02 Abstract ( )   PDF (567KB) ( )   Taking a high-pier and long-span continuous rigid frame bridge as the research project，the dynamic time-history analysis model is established by using the fiber element． By inputting the actual seismic waves in longitudinal direction of different site conditions into the analysis model，their nonlinear time-history responses are analyzed respectively． Based on the analysis results，the effects of seismic response due to different site conditions are compared． And some problems needing attention in seismic design of continuous rigid bridge are pointed out． And the effect of axial compression ratio on hysteretic behavior of pier is also discussed． References | Related Articles | Metrics

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Research on Allowable Grouting Pressure of Stone Arch Bridge Cracks by Means of Fracture Mechanics Jiang Xiaoyuan，Ning Jincheng，Zhao Yafei，Zhou Jianting 2012, 31(2): 184-187.  DOI: 10.3969 /j.issn.1674-0696.2012.02.03 Abstract ( )   PDF (281KB) ( )   Based on the fracture mechanics，the crack stress intensity factors of the stone arch bridge under different grouting pressure are calculated，starting from a simple ANSYS fracture model． And then through the criterion of crack propagation， the allowable grouting pressure of entire grouting and the allowable grouting pressure with different segments grouting length are analyzed，which provides theoretical support for grouting pressure repair cracks． References | Related Articles | Metrics

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Further Determination of Friction Coefficients between High-Strength Zinc-Coated Steel Wires in Stay Cables Chen Can，Zheng Gang，Yan Haijiao，Du Yuan 2012, 31(2): 188-190.  DOI: 10.3969 /j.issn.1674-0696.2012.02.04 Abstract ( )   PDF (314KB) ( )   Accurate identification of friction coefficients between steel wires is one of the prerequisites for analyzing the local bending stresses in stay cables． In order to determine the friction coefficients between high-strength zinc-coated steel wires in stay cables accurately，the test is performed by using specially designed equipment to exert pressure on the wire within the required pressure． The pressure applied by the test can achieve the value of pressure suffered by the stay cables of cablestayed bridge in the actual work． Within the required pressure，a series of the friction coefficients between steel wires in stay cables are determined under certain pressure． Friction behavior and friction coefficients trends can be described: as the pressure increases，friction coefficients between high-strength zinc-coated steel wires decrease significantly． However，when positive pressure increases to a certain value，the decline of friction coefficients is slowing down． References | Related Articles | Metrics

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Secondary Stress of the First Segment Main Cable Near the Saddles in Long-Span Suspension Bridge Yan Kun，Shen Ruili，Yan Yong 2012, 31(2): 191-194.  DOI: 10.3969 /j.issn.1674-0696.2012.02.05 Abstract ( )   PDF (331KB) ( )   The maximum stress of main cables in the long-span suspension bridge is located at the main saddle，and secondary stress is relatively large in this place． Several secondary stress calculation methods of the first segment main cable near saddle can be established by different assumptions． For a long-span suspension bridge，secondary stress calculation results got by different methods are compared with experimental results，and the secondary stress and safety factors of the first segment main cable near saddle in the dead load and live load are calculated． The results show that the calculated results got by different methods are in good agreement with the measured ones when the deformation in the main cable is small． The secondary stress calculations must take the slippage between the wire and the change of ultimate shear friction force with the increase of axis force of the main cable into account when the deformation in the main cable is large． The safety factors of the first segment main cable near saddle reach 2． 0，and the secondary stress of this location can be reduced by taking appropriate measures in the construction process． References | Related Articles | Metrics

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Cable Parameter Identification with Absorber Based on PSO Algorithm Zhang Liwen，He Hua，Chen Qingzhi，Zhou Jianting，Ning Jincheng 2012, 31(2): 195-198.  DOI: 10.3969 /j.issn.1674-0696.2012.02.06 Abstract ( )   PDF (378KB) ( )   The application of particle swarm optimization algorithm ( PSO) is discussed，and the parameter identification of Chongqing Ganxigou No． 1 cable-stayed bridge with the shock absorber of cables is carried out，which is based on the PSO algorithm． As was discovered by this research，once the frequency of multiple-order vibration is known，cable indexes calculated by PSO algorithm such as T，EI，K and εL are reliable． References | Related Articles | Metrics

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Stability Analysis on High Piers with Consideration of Initial Imperfection and Multiple Loads Song Jia，Zhang Min，Li Yinbin 2012, 31(2): 199-202.  DOI: 10.3969 /j.issn.1674-0696.2012.02.07 Abstract ( )   PDF (358KB) ( )   When continuous rigid frame bridges on the maximum cantilever phase are taken as the object，the effect of geometrical initial imperfection and multiple loads on high piers’geometric nonlinear stability are considered at the same time． Calculated formulas for the displacement of pier top and the bending moment of pier bottom are derived，through two methods of establishing elastic stability differential equation and second-order analysis． The approximately calculated formula is obtained，which takes multiple loads as initial imperfection to calculate the displacement of pier top． It is that the solving processes of the displacement of pier top and the bending moment of pier bottom and the most load-carrying capacity under complex operating condition are simplified． The calculation results are in good agreement with the finite element results． References | Related Articles | Metrics

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Influence of Piers on Two Dimensional Stream Fields of Tuojiang River Peng Yongqin，Peng Tao 2012, 31(2): 203-205.  DOI: 10.3969 /j.issn.1674-0696.2012.02.08 Abstract ( )   PDF (419KB) ( )   Stream fields calculating software SMS is applied to verify two dimensional flow field numerical model，utilizing actual measured Tuojiang River velocity and water level data． Stream fields of river in different conditions is calculated，and the impaction of piers to Tuojiang River’s stream fields after constructing bridge is also analyzed，which lays a foundation for river bed scour analysis and formulating reasonable protective measures． References | Related Articles | Metrics

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Mass Production of Plug-ins of Linear Three-Dimensional Bar Model Li Ping，Wang Jialin，Kang Zhuliang 2012, 31(2): 206-209.  DOI: 10.3969 /j.issn.1674-0696.2012.02.09 Abstract ( )   PDF (266KB) ( )   The method of GUI secondary development in ABAQUS to make the plug-ins of linear 3D bar model is described． The plug-ins has realized that the mass production of linear 3D bar model of ordinary reinforced concrete and pre-stressed reinforced concrete． The plug-ins provides powerful support for the further finite element analysis of Box Girder Bridges． References | Related Articles | Metrics

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Outsourcing Concrete Pouring Scheme of Long-Span Stiff Skeleton Arch Bridge Zhang Fugui，Zhang Yongshui，Dong Yi，Wu Shizeng 2012, 31(2): 210-213.  DOI: 10.3969 /j.issn.1674-0696.2012.02.10 Abstract ( )   PDF (847KB) ( )   Taking Zhaohua Jialing river long-span stiff skeleton concrete arch bridge in construction as the research object， Midas Civil 2010 is used to build the beam-plate combination finite element model of arch box． The construction process of outsourcing concrete is calculated and the influence to the force and deflection of stiff skeleton arch bridge is investigated by different pouring scheme． And the stability of the construction process is also taken into consideration，which provides reference for the same kind of bridge construction． References | Related Articles | Metrics

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Construction Mechanical Analysis on Extension of Small Interval Tunnel Shu Yiguang，Jiang Shuping，Lei Minglin 2012, 31(2): 214-217.  DOI: 10.3969 /j.issn.1674-0696.2012.02.11 Abstract ( )   PDF (525KB) ( )   A FEM model is applied to simulate the mechanical characteristics of surrounding rock，middle rock pillar，anchor and preceding lining of a neighborhood tunnel with different clear distances． The results show that: the yield district of extension small interval tunnel is mainly concentrated at arch foot| the initial supporting-lining at the arch foot should be strengthened． When the clear distance is more than 0． 5B，the mechanic state of middle rock pillar is slightly influenced by the clear distance| the bolt axial force of external tunnel is 4 － 5 times than that of the inner． References | Related Articles | Metrics

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Influence of Moving Aircraft Loads on Airport Tunnel Gao Feng，Fu Gang，Hu Wenliang 2012, 31(2): 218-222.  DOI: 10.3969 /j.issn.1674-0696.2012.02.12 Abstract ( )   PDF (360KB) ( )   Taking the construction of tunnel under the Chongqing airport，the dynamic responses of the tunnel under moving aircraft loads are analyzed by using the large finite element software ANSYS． Through the modal and transient computing analysis， the influence on tunnel can be got from the displacement and stress of the tunnel structure． The results show that the dynamic response of the tunnel structure has close relationship with the relative position of tunnel and aircraft． At the same time，the dynamic responses of the parts above arch waist are more remarkable than others． References | Related Articles | Metrics

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Wavelet Analysis on Blasting Seismic Signals of Shilongshan Tunnel Liu Yang，Zhao Mingjie，He Linlin，Lin Junzhi 2012, 31(2): 223-227.  DOI: 10.3969 /j.issn.1674-0696.2012.02.13 Abstract ( )   PDF (831KB) ( )   Using db8 as wavelet basis function，one-dimensional discrete wavelet transform on blasting seismic signals in vertical， horizontal tangential and horizontal radial directions under the same blasting of Shilongshan Tunnel is made within the scale of 7． The original signal，the layers of the wavelet power spectrum and the energy ratio are made by Matlab program． Then the amplitude，spectral characteristics and energy distribution characteristics of the layers of wavelet are analyzed in detail． The results show that the vertical，horizontal tangential and horizontal radial dominant frequency are 78． 125 ～ 2 500 Hz，39． 062 5 ～ 312． 5 Hz and 39． 062 5 ～ 625 Hz respectively． The advantages of this method in frequency and energy analysis can get more comprehensive access to the information caused by blasting vibration signals． References | Related Articles | Metrics

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Open TBM Pass Through Station Plan and Key Technology of Urban Track Transportation Wang Fei 2012, 31(2): 228-235.  DOI: 10.3969 /j.issn.1674-0696.2012.02.14 Abstract ( )   PDF (852KB) ( )   The station generally spacing 1． 0 － 1． 5km of urban track transportation，when using Open TBM to construct，under the models characteristics，construction methods and project planning，it is inevitable to meet the problems of passing through station frequently． Aimed at the first urban track transportation project using Open TBM to construct in domestic， this article have considered idiographic situation with station of TBM passing through，combined with the station constructed condition and the influence of TBM passing through，researched and made sure various passing through station styles of TBM，constituted TBM passing through station schemes and prepared plans reasonably，made sure total project time limit of section and station，solved the technology problems of Open TBM using in urban track transportation，provided technology supporting and reference for TBM using in urban track transportation cosmically and gradually in the future． References | Related Articles | Metrics

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Analysis of Influencing Factors on the Anchorage Strength and Structural Design of the CRCP Brake Plate Huang Xiaoping 2012, 31(2): 236-238.  DOI: 10.3969 /j.issn.1674-0696.2012.02.15 Abstract ( )   PDF (255KB) ( )   Influencing factors on the anchorage strength of the end of brake plate are the end anchorage force， the length of the brake plate， the elastic modulus of concrete， the grass-roots elastic modulus， the subgrade resilient modulus． The displacement and maximum stress of the brake plate anchor system were analyzed with the finite element software ANSYS from the five aspects． The effect of the five influencing factors to the strength of the end of brake plate is obtained． And the types under the different projects conditions of the brake plate are put forward． References | Related Articles | Metrics

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Effect of Heating Temperature and Heating Time on Anti-Aging Performance of Asphalt Mixture He Zhaoyi，Ou Zumin，Liu Nan，Chen Hongbin 2012, 31(2): 239-242.  DOI: 10.3969 /j.issn.1674-0696.2012.02.16 Abstract ( )   PDF (158KB) ( )   Through increasing the aging temperature in short term，the influence of aging performance of the asphalt mixture under high-temperature production process is simulated and the anti-aging performance of asphalt mixture in the process of blending，transportation，paving，rolling is studied． Indirect tensile test results of the asphalt mixture under different time ( 2 hours，4 hours) and different temperature ( 135℃，155℃) of aging have illustrated that the heating temperature and heating time have significant effect on anti-aging performance of asphalt mixture． Experimental results show that the anti-aging performance of anti-rutting agent asphalt mixture has been weakened under high-temperature production process． References | Related Articles | Metrics

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Impact of Multi-Addition Technology on the Performance of Concrete Resistance to Sulfate Dry-Wet Cycles Huang Weirong，Yang Debin，Zhou Jianting，Yan Haibin 2012, 31(2): 243-246.  DOI: 10.3969 /j.issn.1674-0696.2012.02.17 Abstract ( )   PDF (383KB) ( )   Concrete’s resistance to sulfate dry-wet cycle’s performance under stationary solution and flow loop solution is studied by experiments． The two corrosion ways are mixed with multiple mineral admixtures，air entraining agent and polypropylene fiber． The results show that the multiple mineral admixtures，air entraining agent，re-mixed with polypropylene fibers will help to improve the performance of concrete resistance to sulfate dry-wet cycles| when the concrete polypropylene fiber volume content is wthin 0． 2% and air content wthin 6%，the performance of concrete resistance to sulfate dry-wet cycles becomes much stronger，with the increase of polypropylene fiber and air entraining agent content| reducing the permeability of the concrete is a good way to improve its performance of resistance to sulfate dry-wet cycles． References | Related Articles | Metrics

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Barrier and Countermeasures of Reinforced Mesh on Pavement Concrete Vibration Shen Junmin，Zhang Yancong，Tian Bo 2012, 31(2): 247-251.  DOI: 10.3969 /j.issn.1674-0696.2012.02.18 Abstract ( )   PDF (322KB) ( )   In the road engineering，the concrete below reinforced mesh is not always compacted，because the reinforced mesh offers resistance to vibration energy． Through the method of comparing the differences of vibration acceleration and determining the density of the layered concrete，the spread of vibration energy in concrete is studied． It is shown that vibration energy attenuation is about 12% in horizontal direction，meanwhile in vertical direction is about 19% through the reinforced mesh． Concrete hardening state around the vibrating spear has certain effect on the spread of vibration energy． Reinforced mesh has no significant effect on top concrete，but has great effect on the bottom concrete． Vibration frequency and time greatly affect coefficients of vibration energy attenuation，and appropriate increase of vibration frequency or lengthening of vibration time can effectively reduce the energy attenuation． References | Related Articles | Metrics

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Advances in Concrete Acoustoelastic Stress Measurement Technology Liu Xinjian，Xu Xibin，Lin Junzhi 2012, 31(2): 252-256.  DOI: 10.3969 /j.issn.1674-0696.2012.02.19 Abstract ( )   PDF (148KB) ( )   The latest advances of the acoustoelastic theory at home and abroad in recent years are summarized． Related theoretical research findings achieved by applying the acoustoelastic theory to the measurement of the service stress of concrete are mainly introduced and the proposition for the future development of concrete acoustoelastic stress measurement technology is put forward． References | Related Articles | Metrics

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Numerical Simulation on Settlements of Changan Comprehensive Test Track with High Fill Embankment Sun Xiao，Zhao Mingjie，Wang Kui，Xiang Jianming 2012, 31(2): 257-260.  DOI: 10.3969 /j.issn.1674-0696.2012.02.20 Abstract ( )   PDF (368KB) ( )   By contrast with the highway，the characteristics of construction of test track are of high technology standards， complex project management and construction technology． Meanwhile，the design and construction of test track don’t have ready criteria and rules in China． The high-speed circuits and the standard ramp sections of high fill embankment for Chang’an comprehensive test track are analyzed with numerical simulation，the settlement deformation law of high fill embankment can be obtained，and the settlement deformation of the sections which is replaced with limestone soil are analyzed． The research shows that the strength and the stability of the high fill embankment are improved and the settlement deformation and the different settlement of the surface are decreased when the high fill subgrade is replaced by limestone soil． References | Related Articles | Metrics

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Data Processing of Soil Compaction Degree of Vibratory Roller Based on Neural Network Xiang Liang，Cao Yuanwen，Yi Fei 2012, 31(2): 261-263.  DOI: 10.3969 /j.issn.1674-0696.2012.02.21 Abstract ( )   PDF (155KB) ( )   The relationship of the vibration acceleration and the degree of soil compaction in vibratory rollers vibration acceleration synchronous detection is studied by the data processing of BP neural network． The results indicate that the vibration acceleration and the degree of soil compaction is a positive correlation，but is not a linear relationship． It is very good for reflecting the nonlinear relations between them by the nonlinear mapping of BP neural network． References | Related Articles | Metrics

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Experimental Test on Dynamic Properties of Soil-Rock Mediums Wang Jincai，Zhao Mingjie，Chen Wei，Wang Kui 2012, 31(2): 264-267.  DOI: 10.3969 /j.issn.1674-0696.2012.02.22 Abstract ( )   PDF (231KB) ( )   On the base of un-drained dynamic tri-axial shearing tests，soil-rock ratio，confined pressure and earthquake intensity influence on the dynamic properties of the soil-rock medium are researched． The change rule of the dynamic strength is mainly studied，and the change rules of the dynamic cohesion as well as the dynamic internal friction angle of the dynamic strength parameter are also analyzed． The research shows that the dynamic strength of the soil-rock medium increases with the decrease of soil gravel ratios and decreases obviously with the increase of seismic intensity under the condition of the same compaction; the dynamic cohesion decreases gradually with the increase of intensity; while the dynamic internal friction angle decreases with the increase of intensity for a certain stones content，the dynamic cohesion and the dynamic internal friction angle increases with the decrease of soil gravel ratios under the condition of same intensity． Finally，the empirical model of the dynamic cohesion and the dynamic internal friction angle，which is changing with the variation of the soilrock ratio and the earthquake intensity，is given． References | Related Articles | Metrics

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Analysis on Mechanical Properties of Rock Based on Water-Rock Interaction Liu Xiaoqiang，Zhou Shiliang，Shang Mingfang，Li Yi 2012, 31(2): 268-273.  DOI: 10.3969 /j.issn.1674-0696.2012.02.23 Abstract ( )   PDF (459KB) ( )   The rock samples，which are collected from the first-stage project field of Funing port in Yunnan Province，are carried out the conventional triaxial compression test after the different numbers of drying and wetting cycles． The mechanical properties parameters variation rule of mudstone and sandstone under the water-rock interaction can be found through the measured rock mechanical properties regression analysis． The continuous damage mechanics approach，based on the elastic modulus，is applied to compare and analyze the deterioration characteristics of mudstone and sandstone． The strength between rock and rock mass has been obtained after engineering conversion of rock mechanic parameters by Hoek-Brown strength criterion． The changing characteristics of overhead sloping type wharf properties have been obtained during the water- rock interaction based on the finite element method． References | Related Articles | Metrics

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Design and Development of Road Maintenance Visualization System Based on WebGIS Zhou Hongyu，Feng Xiao，Zhou Zhuo，Qiang Ming 2012, 31(2): 274-278.  DOI: 10.3969 /j.issn.1674-0696.2012.02.24 Abstract ( )   PDF (417KB) ( )   An Internet-based geographic information system ( WebGIS) platform structure is studied on the basis of the Arc- GIS Server technology． The key issues for road maintenance WebGIS development，such as users’rights management and maintenance modules，multi-scale processing and expression of the spatial data，dynamic segmentation technology of Web- GIS are applied to establish the experimental platform of WebGIS system． The system is divided into three major function modules: users’rights management and maintenance modules，the data service module，information dissemination module． The design and application of WebGIS system are discussed on the basis of Chongqing Banan District road management． The feasibility of the theories and methods are tested through the system． References | Related Articles | Metrics

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Crashworthiness Simulation Comparison between Semi-Rigid Double-Wave Guardrails and Double-Bar Semi-Rigid Guardrail Liu Jianxun，Tang Hui，Zhang Yifeng，Huang Tao，Li Xiaosong 2012, 31(2): 279-282.  DOI: 10.3969 /j.issn.1674-0696.2012.02.25 Abstract ( )   PDF (433KB) ( )   Based on ANSYS /LS-DYNA，the crash between vehicle and semi-rigid guardrails is simulated． And the differences of vehicle track，occupant safety and guardrail deformation between semi-rigid double wave guardrails and double semi-rigid guardrails are compared and analyzed． The results show that the semi-rigid double wave guardrail is likely to cause drill accidents and saddle accidents when crash happens; while the double semi-rigid guardrail can prevent those kinds of accidents efficiently，which can also meet the safety requirements of occupant and vehicle． References | Related Articles | Metrics

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Traffic Crash-Related Tort Issues in California Wang Zhongren，Liao Chao 2012, 31(2): 283-288.  DOI: 10.3969 /j.issn.1674-0696.2012.02.26 Abstract ( )   PDF (497KB) ( )   Traffic crash-related tort cases become more and more commonplace in China． In this paper，how tort cases are handled in California and the United States are presented，with focus on the definition，adjudication，discovery，and settlement． Case studies are also presented for illustration purposes． Presented in the end，are the worked strategies on how to effectively prevent traffic crash-related tort cases in the process of project development and maintenance and operations． References | Related Articles | Metrics

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Optimization Strategy of Operational Management for Urban Rail Transit Based on Utility Theory Li Liqun，Chen Long 2012, 31(2): 289-292.  DOI: 10.3969 /j.issn.1674-0696.2012.02.27 Abstract ( )   PDF (235KB) ( )   The urban traffic demand and travel decision-making are analyzed based on formation mechanism of passenger flow． It is proposed that transport needs of the traffic demand are a necessary condition，and the payment ability of travelers for the traffic demand is a sufficient condition． It is thought that travel decisions are based on the principle of traveler utility maximization． The competitive game mechanism and sharing modes of transportation are discussed between urban rail transit and public bus based on utility theory models． Taking Guangzhou as a test example，it is found that the passenger flows are divided into the peak period，the middle period and the low passenger flow period． There are adequate passengers during peak period; the city transportation system capacity is fully utilized． The relative scarcity passengers appear during the middle and the low period，which result in transport capacity idle and waste． The operational optimization strategy of tickets price flexibility and appropriate time interval are proposed based on utility theory． The results show that the daily passengers have increased 14． 9% in Guangzhou after the implement of comprehensive optimization strategy． References | Related Articles | Metrics

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Transportation Queuing Processes Research Based on Queuing Network Li Bing，Hao Yue，Xuan Hua 2012, 31(2): 293-298.  DOI: 10.3969 /j.issn.1674-0696.2012.02.28 Abstract ( )   PDF (345KB) ( )   The transportation queuing processes in the process of passenger transportation and freight transportation are generally analyzed． The characteristics of the transportation queuing processes are summarized． And the queuing network chart is used to describe the transportation queuing processes． Then the state variables and equations to model the unloading queues and departure queues are analyzed． And the transportation queuing process is simulated by the Flexsim software． So the transportation queuing process can be clearly known and the research will be helpful to organize passenger transportation and freight transportation． References | Related Articles | Metrics

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Multi-Sensor Data Fusion Based on Multi-Scale Kalman Filter Li Yi，Lu Baichuan，Li Xue 2012, 31(2): 299-303.  DOI: 10.3969 /j.issn.1674-0696.2012.02.29 Abstract ( )   PDF (303KB) ( )   With the analysis on the multi-scale dynamic system model，a novel multi-sensor data fusion algorithm based on wavelet transform and Kalman filter is proposed． The algorithm combines real-time and recursiveness of Kalman filter and multi-scale characteristics of wavelet transform and it is also able to fuse the observed data of multi sensors effectively． Firstly the primal estimate from Kalman filter on the thinnest scale is decomposed by wavelet to each scale． Secondly information data on each scale is refreshed by observed data of corresponding scale using Kalman filter． Finally wavelet reconstruction is applied to integrate the estimate information． After simulation test，the accuracy of data fusion goes well． References | Related Articles | Metrics

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Model Design of Waterway Regulation of Kashi Section in Kezi River Zhang Shuaishuai，Yang Shengfa，Gong Jiunan，He Yang 2012, 31(2): 304-307.  DOI: 10.3969 /j.issn.1674-0696.2012.02.30 Abstract ( )   PDF (292KB) ( )   Comprehensive control project along the Kezi River in the urban area of Kashi is a material item of overall planning of urban development in Kashi． Due to few research results of this kind of river and large errors occurring when the scour depth is calculated by the formula，physical model tests are more reasonable to study the issue． Through the analysis of abnormal defects of the normal model ( light sand and natural sand) and traditional model，other similar scale ratios are determined by using the distorted movable-bed model． References | Related Articles | Metrics

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Evolution and Regulation of Complex Shoals of Shizikou，Wujiang River Zhao Jian，Liu Zhaocun，Zhang Xiaoming，Fu Hua，Zhao Shiqiang 2012, 31(2): 308-313.  DOI: 10.3969 /j.issn.1674-0696.2012.02.31 Abstract ( )   PDF (362KB) ( )   The evolution of the shoal patches of Shizikou，Wujiang River and its waterway regulation is studied． Form the viewpoint of relations between the sediment transport and the river channel evolution，the obstructing navigation mechanism is elucidated． The principles of minimum energy dissipation rate observed by the evolutional processes of channel morphology are applied． The properties of energy distribution in space of the complex shoals in curved river channel regulating is explored． The effective concrete regulating measures are explored for the complex shoals in curved mountain river channel on the basis of physical experiments． The properties of complex shoals of curved river regulation are summarized finally，and the results are valuable to regulation study of the mountainous rivers． References | Related Articles | Metrics

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Comprehensive Evaluation on Chongqing Waterway Transportation Sustainable Development Zhang Rongguang，Liu Wenna，Gong Hao，Lei Youxin 2012, 31(2): 314-317.  DOI: 10.3969 /j.issn.1674-0696.2012.02.32 Abstract ( )   PDF (150KB) ( )   Five supporting systems，which are survival，developmental，environmental，and social and manpower，are the essential factors for the sustainable development，and can be regarded as the basic elements for judging the ability of sustainable development at the same time． From the aspects of the five supporting systems，a comprehensive evaluation to the sustainable development of a region is made． The hierarchical analysis method is applied to calculate the index weights of each supporting system and linear transformation is used to get the standard value of index weights． Then the total evaluation on Chongqing waterway transportation sustainable development is obtained，which achieves to the degree of sustainable development． References | Related Articles | Metrics

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Principle of Electronic Anti-Dazzling Rear-View Mirror Huang Zhen1，Fang Ruihua，Ge Ruhai 2012, 31(2): 318-322.  DOI: 10.3969 /j.issn.1674-0696.2012.02.33 Abstract ( )   PDF (273KB) ( )   The principle of the electronic anti-dazzling rear-view mirror is studied． The electronic anti-dazzling rear-view mirror makes use of two photoresists to detect the front and back light intensity of the car． When the back light intensity is more than the light intensity of the front， according to the absolute value of difference of front and back the light intensity， output voltage to the glass， electro-chromic change light is used to change the transmittance，which can reduce the reflectivity of the light． Therefore， anti-dazzling performance is realized． References | Related Articles | Metrics

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LQG Control of Acceleration /Braking System Based on Wheelbase Preview Pan Gongyu，Huang Yu 2012, 31(2): 321-325.  DOI: 10.3969 /j.issn.1674-0696.2012.02.34 Abstract ( )   PDF (664KB) ( )   A mathematic model of one second vehicle about acceleration /braking system based on air suspension is established． By applying wheelbase preview control to forecast the road surface roughness at the front wheel，the optimal controller based on wheelbase preview control theory is designed． Then the simulation is implemented in the MATLAB/Simulink environment． The simulation results show that the performance of the active air suspension acceleration /braking system with a LQG controller based on wheelbase preview can effectively suppress vehicle vibration compared with the passive air suspension acceleration /braking system; and compared with the optimal air suspension acceleration /braking system，the active air suspension acceleration /braking system does well in improving the ride comfort of acceleration /braking system． References | Related Articles | Metrics

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Numerical Simulation of Internal Flow Field and Structure Optimization of SCR Catalytic Converter Gao Wei，Deng Zhaowen 2012, 31(2): 326-330.  DOI: 10.3969 /j.issn.1674-0696.2012.02.35 Abstract ( )   PDF (426KB) ( )   The numerical simulation of three-dimension steady state flow is carried out on the internal flow filed of SCR catalytic converters before and after structure optimization，by using the computational fluid dynamics ( CFD) code． The internal flow characteristics of two different SCR catalytic converters have been contrastively analyzed． The results show that: the structure factor has a great impact on the flow of catalytic converters． Through the improvement of structure，the pressure loss can be reduced，which makes velocity and temperature distribution in the catalytic converters to be more uniform． References | Related Articles | Metrics

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Combustion and Emission Characteristics of a CNG Engine at Idle Condition He Yituan，Su Zhikai，Jian Xiaochun，Shao Yiming 2012, 31(2): 331-334.  DOI: 10.3969 /j.issn.1674-0696.2012.02.36 Abstract ( )   PDF (300KB) ( )   The rule of ignition advance angle ( θi ) and excess air ratio ( λ) influencing on the combustion and emissions characteristics is investigated on a CNG engine at idle condition． The throttle valve is fully closed． When the parameters are changed，the stepper motor is adjusted automatically to control the engine speed at 800 r /min． When the ignition advance angle is changed from 40 to 10o crank angle ( CA) before top dead center ( BTDC) ，the maximum indicated thermal efficiency ( ITE) and the maximum burning speed are observed at λ = 1． 1． As the excess air ratio λ increases，the maximum ITE is corresponding to a greater θi ． The CoVimep will be increased if the ignition is too early or too late． When the excess air ratio λ is more than 1． 3，the CoVimep increases obviously． When λ = 1． 1，NOx emissions get the highest level． References | Related Articles | Metrics

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Power Performance of Battery Electric Vehicle Based on Dynamic Modeling and Simulation Pan Chaofeng，Xu Xing，Liao Xueliang，Zhou Kongkang 2012, 31(2): 335-338.  DOI: 10.3969 /j.issn.1674-0696.2012.02.37 Abstract ( )   PDF (307KB) ( )   To solve the problem of power performance analysis of battery electric vehicle，dynamic simulation model is established based on Simulink，according to motor test data． Power performance indexes of the battery electric vehicle are calculated． The results show that the dynamic modeling and simulation methods are more convenient and efficient than the traditional calculation methods，which can reflect the power performance characteristics of battery electric vehicle under mutational load in actual vehicle driving road conditions． References | Related Articles | Metrics

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Powertrain Structure Design for Fuel Cell Electrical Vehicle Lu Ye，Gan Pin，Liu Fen 2012, 31(2): 339-343.  DOI: 10.3969 /j.issn.1674-0696.2012.02.38 Abstract ( )   PDF (286KB) ( )   Based on the experiences of developing and applying fuel cell vehicles，two practical powertrain structures are compared，and it comes to the conclusion that the powertrain of PFCV is of higher efficiency，lower cost，and more safety for battery utilizing etc． Some guidelines for powertrain design are summarized． Through revealing the developing process of a given PFCV powertrain，the systematic methods for powertrain and power distribution design are introduced． With a series of verifications by simulation and experiment，the mentioned powertrain and its design and analysis methods are proved to be correct and appropriate，which is also referential to the energy distribution design of hybrid vechicles． References | Related Articles | Metrics

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Simulation of Fuzzy-PID Control for Vehicle Anti-Lock Braking System Hu Qiguo，Ren Long 2012, 31(2): 344-348.  DOI: 10.3969 /j.issn.1674-0696.2012.02.39 Abstract ( )   PDF (624KB) ( )   The mathematical modeling of ABS ( antilock braking system) is carried out through a single wheel vehicle． Fuzzy control theory and conventional PID control theory are applied to construct a satisfactory self-tuning fuzzy PID controller parameters． The simulation on established vehicle ABS mathematical model is carried out under different road conditions． The simulation results are compared with those got by the traditional PID control of the ABS systems． Simulation results show that based on fuzzy self-tuning PID controller parameters，the ABS system can adjust the parameters in real time，and the control of the ABS braking system is better than PID controller． Whether in dry or wet road surface，snow and ice，the wheel can make the best work in the vicinity of the slip rate，shorten the braking distance and effectively improve the directional stability when vehicle is in braking． References | Related Articles | Metrics

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Fault Diagnosis of Marine Diesel Engine Fuel System Based on Wavelet Neural Network Yin Honghao，Peng Zhongbo 2012, 31(2): 349-352.  DOI: 10.3969 /j.issn.1674-0696.2012.02.40 Abstract ( )   PDF (228KB) ( )   A wavelet neural network have been designed and built up． The singularity of fuel pressure signal is analyzed by wavelet transform modulus maxima to extract fault feature vectors． According to the data sampled from diesel engine fuel system working conditions，learning samples are obtained． Accordingly，nonlinear mapping between the neural network inputs and outputs have been well established via network training． Afterwards，fault diagnosis is achieved based on the input of feature vectors． According to the analysis and verification from the experimental data，this method is of good diagnosis effect． References | Related Articles | Metrics

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Force Calculation of Turret FPSO Single Point Mooring System Li Weifeng，Shi Guoyou，Li Wei，Yang Jiaxuan 2012, 31(2): 353-356.  DOI: 10.3969 /j.issn.1674-0696.2012.02.41 Abstract ( )   PDF (257KB) ( )   According to the national relative criterions and standards，some calculations are made on wind force，current force as well as wave force which affect FPSO single point mooring system． Then the force conditions of mooring chains of the mooring system are analyzed． The force calculation modal of mooring chains is established，making use of the static method to solve the dynamic force of anchoring chain problem，which provides a simple but effective method to check the turret FPSO single point mooring system． Finally，taking the“South Sea Development”FPSO as an example to check the correction of the method，and it is verified that the calculation results are very close to the actual conditions． References | Related Articles | Metrics