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Research on Vehicle-Bridge Coupling Vibration of Self-Anchored Suspension Bridge with Single-Tower Li Hongquan, Zhao Mingshuai, Chen Yanjiang 2015, 34(3): 1-6.  DOI: 10.3969/j.issn.1674-0696.2015.03.01 Abstract ( )   PDF (923KB) ( )   Based on separated iterative algorithm of ANSYS and MATLAB, the motion equations of the vehicle and the bridge which were regarded as two separated subsystems were derived by virtual work principle and finite element method respectively. The displacement coordination condition and force balance relation at contact point were taken into consideration, in order to study the responses of self-anchored suspension bridge with single-tower under various road roughness, vehicle speed and bridge damping. Results indicate grade of road roughness has great influence on dynamic response of bridge. The impact factor behaves wavelike at different speeds. With increase of damping, the response tends to diminish in little degree. In addition, impact factor in current specification tends to be unsafe for structure design of this type of bridge. It is advised that the impact factor of suspension bridge should be regulated separately, considering the effects of road roughness and speed. References | Related Articles | Metrics

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Vehicle-Bridge Coupled Vibration Model of Straddle Type Monorail Considering with Cornering Characteristics Liu Yuyu, Wang Yonghu 2015, 34(3): 7-11.  DOI: 10.3969/j.issn.1674-0696.2015.03.02 Abstract ( )   PDF (786KB) ( )   In order to study the interaction between vehicle and straddle type monorail beam, a simply-supported PC track beam of straddle type monorail line in Chongqing was taken as the research object to establish the coupled vibration model. Each car in the monorail train was idealized as a dynamic system of 15-degrees-of-freedom. The cornering characteristics of the tires were taken into consideration. Vehicle’s differential equations were derived by using Lagrange formulation. The track beam was idealized as Euler beam and its differential equations were derived by using modal synthesis method. The dynamic responses of the coupled system were studied at different running velocities, which were compared with the field-test data and the results of the model which has no cornering characteristics. The results show that a proper correlation is found and the model which considers cornering characteristics gives a more actual result. The cornering characteristics can be ignored when studying the vertical coupled vibration problem and should be taken into consideration when studying the lateral problem. References | Related Articles | Metrics

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Numerical Analysis on Vibration Characteristics of Elevated Box Girders in Urban Mass Transit Zhang Renwei, Wei Hongliang 2015, 34(3): 12-15.  DOI: 10.3969/j.issn.1674-0696.2015.03.03 Abstract ( )   PDF (731KB) ( )   In order to study the vibration response of the elevated box girders in urban mass transit subjected to the train, 3D vibration model of simply supported girder was established by FEM. Thus the dynamic response of the box girder can be obtained, with the train running at a velocity of 60, 80, 100 and 120 km/h. The modal analysis results show that mode shapes of which natural frequencies is higher than 10 Hz present a deformation in section, and the vibration pattern of box girder appears as the bending vibration of composed plate element gradually. The time domain analysis result shows that when the train passes, the distribution of vibration appears as a phenomenon that the acceleration amplitude of flange is the largest, the one of web is the second, and the one of deck and bottom plate is the smallest in all. The vibration levels of rail, slab, deck, flange, web and bottom plate range of 140~160, 110~120, 110~120, 115~130, 110~125 and 105~115 dB respectively, and increase with the improvement of train speed. References | Related Articles | Metrics

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Crack Width Calculation Method of Ribbed Steel-Concrete Composite Beam Wang Xiaodong,Wei Wenlong, Tang Liang 2015, 34(3): 16-20.  DOI: 10.3969/j.issn.1674-0696.2015.03.04 Abstract ( )   PDF (530KB) ( )   Referring to the bond-slip theory of reinforced concrete cracks calculation method, crack spacing formula of the rectangular Ribbed Steel-Concrete Composite beam (RSCC beam and strain formula of the top of stiffen plate were developed. The formulas explain the phenomena: the crack spacing of RSCC beam is smaller than that of ordinary reinforced concrete beams in the experiment. Referring to the calculation of ordinary reinforced concrete cracks comprehensive theory, the formula for calculating the maximum crack width of RSCC beam was derived. References | Related Articles | Metrics

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Experimental Study on Shear Performance of Embedded Steel Plate and Concrete Interface Fan Liang, He Jun 2015, 34(3): 21-25.  DOI: 10.3969/j.issn.1674-0696.2015.03.05 Abstract ( )   PDF (694KB) ( )   The shearing capacity and shear-slip relation of steel plate-concrete interface are important bases for the whole process analysis of steel-concrete composite structure. On the basis of a typical shear-slip constitutive model of shear connector, a slip constitutive model of embedded steel plate-concrete interface was established. Shearing test with 21 samples was conducted, thus, concrete strength and typical viscous slip curves of embedded steel plate and concrete interface were fitted in terms of different steel plate areas and roughness. And shear capacity formula of embedded steel plate and concrete interface was established. Besides, slip constitutive equation factors of embedded steel plate-concrete interface were determined. Results show that embedded steel plate and concrete interface shear capacity is weaker than that of tube concrete and steel reinforced concrete. References | Related Articles | Metrics

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Study on Disease Mechanical Simulation of Highway Tunnel Lining Liu Xingen, Liu Xuezeng, Qi Lei, Zhou Decheng, Peng Dan 2015, 34(3): 26-31.  DOI: 10.3969/j.issn.1674-0696.2015.03.06 Abstract ( )   PDF (657KB) ( )   Base on the theoretical calculation of load structure method on tunnel, the mechanical simulation model of the highway tunnel lining disease which included cracks, material degradation, voids, additional load and others was established. The highway tunnel lining damage mechanics simulation software was developed, in order to evaluate the bearing capacity of lining diseases. A case of history calculation shows that cracks and voids of lining will reduce the safety factor structure, and the safety factor of the structure within the affected area is relatively stable, and as the distance from the position of the disease becoming large, its impact weakens gradually. References | Related Articles | Metrics

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GPR for Detecting Karst-Fissure Aquifer in Tunnel Zhao Ningyu, Pan Jinqiu, Yu Haijun, Liang Bo 2015, 34(3): 32-35.  DOI: 10.3969/j.issn.1674-0696.2015.03.07 Abstract ( )   PDF (815KB) ( )   The geological development principles of karst-fissure aquifer were analyzed. Then the characteristics of GPR electromagnetic reflection signal on karst-fissure aquifer and water content estimation method based on wave velocity-dielectric constant relationship were studied. Through specific engineering application, the geological radar has good resolution to fracture water buried in low water content rock and in fractured rock environments. And the estimation method of Karst fissure water moisture is feasible. The validity of the signal analysis method based on the geological understanding of the law to delineate adverse geological of karst fissure water and to estimate water content was verified. References | Related Articles | Metrics

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Optimized Design of Asphalt Pavement Based on Pavement Skid Resistance Performance Liu Qinkun, Chen De, Ye Zhongchen, Guan Fuyang 2015, 34(3): 42-46.  DOI: 10.3969/j.issn.1674-0696.2015.03.09 Abstract ( )   PDF (567KB) ( )   The existing asphalt pavement design methods only use the structural parameters as design parameters without considering surface performance. A series of asphalt pavement types, including coarse and fine gradations, were chosen to test their texture and friction using different texture (i.e. Sand Patch Testing and Laser Texture Tester) and friction testing methods (i.e. British Pendulum Tester and Dynamic Friction Tester). At the same time, the mixture samples, with same design parameters, were compacted with Superpave Compactor Method and tested with the same testing methods. Based on those testing results, the relationships between different testing methods, compaction methods, design parameters and macro-texture and skid resistance were obtained. The results show that there are a good correlation between macro-texture, skid resistance and the MTD. Meanwhile, a model to predict the skid resistance of asphalt pavement using the design parameters was built. It can be used in asphalt pavement design basing on skid resistance performance. References | Related Articles | Metrics

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Research on Ageing Process and Mechanism of Heat-Reflective Coating of Asphalt Pavement Tang Boming, Yuan Ying, Cao Xuejuan, Tian Chunling, Yu Miao 2015, 34(3): 47-51.  DOI: 10.3969/j.issn.1674-0696.2015.03.10 Abstract ( )   PDF (616KB) ( )   The heat-reflective coating for asphalt pavement is subject to ageing processes which affect its cooling performance. The aging laws and mechanism of heat-reflective coating were surveyed. The methods used in the study are known as natural aging test, surface observation, FTIR , reflectivity measurement, cooling performance test. The results of the experiment indicate that one of the key factors on ageing is the quantity of solar irradiation. In addition, the heat-reflective coating aged with carbon-carbon double bond cleavage and carbon-oxygen double bond formation which can cause the reduction of reflectivity. Also, there are some correlation between reflectivity and cooling performance and both of them decreased with aging time. References | Related Articles | Metrics

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Laboratory Test Study of Cement Emulsified-Asphalt Mixture Performance Based on Emulsifier Complex Technology Xiao Jingjing, Li Zhihan, Sha Aimin, Jiang Wei, Wang Zhenjun 2015, 34(3): 52-56.  DOI: 10.3969/j.issn.1674-0696.2015.03.11 Abstract ( )   PDF (770KB) ( )   Through laboratory test and microscopic concept analysis means such as scanning electron microscope, the demulsification speed’s influence law on cement emulsified-asphalt mixture’s construction performance and pavement performance of different emulsifier complex scheme were studied to reveal the mixture’s strength formation mechanism. The results show too fast or too slow demulsification speed is not conducive to mixture’s pavement performance. The two different emulsifiers MQK-1M and SBT were remixed with the scheme of 0.8%+1.0% to produce emulsion. And the mixture which used this emulsion possessed good construction performance, mechanical performance and pavement performance. And this mixture can be used for the pavement’s mid-layer, lower layer and flexible base. References | Related Articles | Metrics

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Local Scour Depth Calculation of Roadbed along River Causing by Snowmelt Disasters in Xinjiang Wu Guoxiong, Wang Tao, Zhou Yu,Yu Miao 2015, 34(3): 57-62.  DOI: 10.3969/j.issn.1674-0696.2015.03.12 Abstract ( )   PDF (761KB) ( )   Xinjiang mountain watershed was taken as the object of the research. On the foundation of exactly estimating the max snowflow discharge, the influence factors of structures along the river embankment in the aspect of water flow characteristics, scour mechanism and scour depth and scope near the junction were analyzed. Indoor lab experiments were carried out to simulate the scour. Firstly, the relationship between each influence factor and the slop erosion depth was found out. Then the slop erosion under different flow quantity, flow rate, water depth, hill slop gradients, side slope gradient, subgrade depth and sand particle size were simulated. Finally the maximum erosion depth was gained by the above lab results and theoretical analysis, and its validity was checked. References | Related Articles | Metrics

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Experimental Research on Cracking Rules and Influence Factors of Compacted Expansion Soil Wei Bingxu, Gao Bing, Huang Zhen，Li Zhengfu 2015, 34(3): 63-66.  DOI: 10.3969/j.issn.1674-0696.2015.03.13 Abstract ( )   PDF (534KB) ( )   Computer image processing and programming technology were used to describe and analysis quantitatively features of expansive soil surface cracks under the different influence of compaction degree, the initial water content and dry wet cycles. The factors of dry wet cycles, degree of compaction and initial moisture content which have influence on expansive soil cracking rules were discussed. The results show that: the parameters such as node number, number of blocks, fracture rate, fractal dimension parameters can be characterized the degree of fracture cracking; with increase of expansion soil compaction degree, the degree of cracking decreases; expansive soil cracking extent under plastic limit water content of the initial water content is less than that of optimum water content; with the increase of cycle number, the degree of cracking increases, but change amplitude of the fracture parameters decreases, the first dry-wet cycle influence on cracking was maximum, and the fifth, or the sixth times have little effect on cracking. References | Related Articles | Metrics

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Experimental Study on Lime Improvement of Fluvioglacial Deposits in Mianyang Zhu Mingang, Chen Pengyu, Qi Yunlong, Wei Jungang, Tang Weiwu 2015, 34(3): 67-71.  DOI: 10.3969/j.issn.1674-0696.2015.03.14 Abstract ( )   PDF (612KB) ( )   In order to conduct a comprehensive and systematic research about the change law of engineering property and mechanical properties of fluvioglacial deposits, it conducted indoor experimental research about fluvioglacial deposits under the dosage of lime of 0%,3%,5%,7%,9%,11%, and obtained data of the grain composition, free swell ratio, plasticity index, swell increment, shear strength, CBR, unconfined compressive strength of fluvioglacial deposits modified soil before and after it is improved with lime, and then it ensured the optimum proportion is 7%. References | Related Articles | Metrics

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Three Dimensional Flow Fields Numerical Simulation of Long Corridor Filling-Emptying System Chamber of Ship Lock Wall Peng Yongqin, Peng Tao 2015, 34(3): 72-75.  DOI: 10.3969/j.issn.1674-0696.2015.03.15 Abstract ( )   PDF (1645KB) ( )   After using the measured data to validate numerical models, the flow field analysis software Fluent was adopted to build a three-dimensional mathematical model, for calculating the chamber flow field in the process of filling water, and analyzing evolution of vertical flow field in the filling process. The study shows that when scale space is certain and each hole jets uniformly, if the number of collateral hole increases, the number of swirl also increases, but the swirl range is reduced, which is in favor of the hull moored. References | Related Articles | Metrics

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Research on Water-Flow Relationship Evolution of Chongqing Reach Early in the Three Gorges Reservoir Liu Tianyun, Zhang Fan, Liu Yong 2015, 34(3): 76-78.  DOI: 10.3969/j.issn.1674-0696.2015.03.16 Abstract ( )   PDF (632KB) ( )   On the basis of collecting a large number of hydrological data, using the method of numerical analysis, it showed that critical water level which impacted on Cuntan station in Chongqing reach water-flow relationship after the Three Gorges Reservoir was 156 m. This critical water level was taken as a bound. When the water level was below it, Chongqing reach was in natural state; when the water level was above it, Chongqing reach was the reservoir or the fluctuating back water district. The water flow curve of Cuntan station in the early years of the Three Gorges Reservoir was available. The result shows water-flow relationship adopting the method of shunt magnitude in the fluctuating back water district is good. References | Related Articles | Metrics

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Analytical Formula of Sweden Method through Circular Function Integration and Improved Method to Search Sliding Surface Xu Nianchun, Wu Tongqing, Lin Junzhi, Li Chengfang, Chen kui 2015, 34(3): 79-81.  DOI: 10.3969/j.issn.1674-0696.2015.03.17 Abstract ( )   PDF (380KB) ( )   In order to enhance the engineering analysis effect of the Sweden slices method, the circular function integration has been used to get the analytical formula of stability coefficient for a homogeneous slope. Applying this integration formula to analyze slopes, the amount of calculation will be saved and the most accurate result can be got. In order to resolve the shortcoming of current method, an improved method was put forward, according to which, the most dangerous circular surface can be confirmed through searching the circular arc’s intercept on the slope’s top face and radius. The improved method can not only reduce the searching time but also guarantee the success to track the dangerous sliding surface. References | Related Articles | Metrics

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Assessment and Analysis on Urban Traffic Competitiveness of Main Cities in Henan Province Fan Hehua, Zhou Yongwei 2015, 34(3): 82-85.  DOI: 10.3969/j.issn.1674-0696.2015.03.18 Abstract ( )   PDF (405KB) ( )   The 17 main cities (Jiyuan city is not included) of Henan province was regarded as the object of research. Firstly, the composite rank model of urban traffic competitiveness was built. Then 11 indexes of urban traffic competitiveness were selected, and 3 main factors were picked up, on this basis, the score of integrated factors was used to rank urban traffic competitiveness. The rank result shows that: Zhengzhou city has the strongest traffic competitiveness, followed by Luoyang, Xinxiang, Xuchang and Kaifeng; the last 3 cities are Puyang, Xinyang and Hebi respectively. Secondly, the cluster analysis on traffic competitiveness of 17 main cities was carried out under the new main factors. Finally, combing the result of cluster analysis to factor score, one city of central Henan urban agglomeration was chosen as the behalf of each cluster, of which evaluation result was analyzed, and the related measures of raising its traffic competitiveness were put forward. References | Related Articles | Metrics

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Study on Highway Evacuation Route Based on Improved Ant Colony Algorithm Li Qiaoru, Zhang Qian, Chen Liang, Cui Ning 2015, 34(3): 86-92.  DOI: 10.3969/j.issn.1674-0696.2015.03.19 Abstract ( )   PDF (705KB) ( )   According to the characteristics of expressway emergency evacuation, improved ant colony algorithm was applied in traffic assignment models. Firstly, the function of traffic flow and capacity was introduced as a part of the algorithm state transition rules. Consequently the paths with larger capacity and shorter travel time were chosen preferentially when searching. Secondly, the influences of ant colony algorithm parameters on calculation results and the convergence speed were studied by experimental analysis, then the optimal combination of algorithm parameters were presented accordingly. Finally, the optimal parameter combination was applied to the improved ant colony algorithm, and the searching results were compared with the basic ant colony algorithm through simulation experiments. The results show that ant colony algorithm with the optimal combination parameter has advantages in accelerating the search speed and optimizing the global optimal solution. The visual emergency evacuation paths are available through the path analysis via expressway emergency evacuation system based on GIS. References | Related Articles | Metrics

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Determining Effective Paths Set Based on Reverse Depth-First Search Algorithm Zhang Jianxu, Jiang Yan, Liu Xingguo 2015, 34(3): 93-98.  DOI: 10.3969/j.issn.1674-0696.2015.03.20 Abstract ( )   PDF (626KB) ( )   Based on the definition of alternative path, the range of effective path impedance values was identified. Adopting the depth-first algorithm and the idea of getting closer to the end from the effective path Dail algorithm, an effective paths search algorithm which starts from the end node to the front node was proposed. Numerical results show that, the effective path search algorithm not only identifies the impedance values range associated with the network structure automatically, but also finds the effective path sets quickly. References | Related Articles | Metrics

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Researching on Seamless Connection of Transportation Hub Based on Evaluation Method of Vague Compound Matter-Element Han Zhi, Luo Chao, Chen Pengyu, Xiao Qiurui, Yang Yun 2015, 34(3): 99-104.  DOI: 10.3969/j.issn.1674-0696.2015.03.21 Abstract ( )   PDF (478KB) ( )   The evaluation requirements of seamless connection were analyzed and then the comprehensive evaluation index system was constructed. Vague Compound matter-element model can be established by combining Vague with the extension matter-element evaluation method. A seamless connection comprehensive evaluation of one Chongqing integrated transportation hub was implemented by using this model. The evaluation results is “the secondary”, which validates that the model has good practicability and reliability. References | Related Articles | Metrics

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Analysis of Traffic Conflict in Non-Signalized Intersection Zhang Lin, Huang Xuanwei, Wu Weiming 2015, 34(3): 105-111.  DOI: 10.3969/j.issn.1674-0696.2015.03.22 Abstract ( )   PDF (1465KB) ( )   In order to study the driver’s decision-making behaviors of the conflict vehicles in non-signalized intersection, according to the driver’s personality factors and the relative potential factors in the different strategies which affect the driver to make decisions, as well as the time refinement, the utility function of the driver’s behaviors based on the dynamic reduplicate game theory was built up from the view of game theory. As the decision-making behavior by the driver in the process of cross-road, analyzing the different combination of the utility of the driver’s decision-making behavior, Nash equilibrium was existed in a single game process, and the driver’s optimal decision behaviors in a dynamic game was obtained. The illustration shows that impulse drivers in the decision-making period of time are more willing to choose to accelerate the first strategy; mild drivers prefer to choose accelerate the preemptive strategy or maintain uniform strategy; cautious drivers prefer to choose to maintain uniform strategy or deceleration comity strategy. References | Related Articles | Metrics

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A Traffic Incident Duration Time Predication Model Using Multivariable Decision Tree Xiang Hongyan, Jin Ming 2015, 34(3): 112-116.  DOI: 10.3969/j.issn.1674-0696.2015.03.23 Abstract ( )   PDF (541KB) ( )   Using theory and method of rough set and decision tree, a multivariable decision tree model was developed for traffic incident duration time prediction. Through analyzing the incident attributes, the attribute reduction algorithm in rough set theory was used to get the core attributes of the incident. By using the generalization principle of equivalence relation, a multivariable combination test was formed. By comparing the dependence of different variable combinations, the optimal variable combination was determined. Then, multivariable combination criterion instead of single variable criterion was used to set up the decision tree, and through limiting tree height and number of tree leaves, the scale of tree was controlled, so, the tree’s structure was optimized. The case study shows that this model has a good performance in classifying and forecasting traffic incident duration time, and it has good accuracy in duration time forecasting. References | Related Articles | Metrics

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OD Matrix Inference for Urban Public Transportation Trip Based on GPS and IC Card Data Yang Wanbo,Wang Hao,Ye Xiaofei, Xu Chuangchuang, Jiang Dongxue 2015, 34(3): 117-121.  DOI: 10.3969/j.issn.1674-0696.2015.03.24 Abstract ( )   PDF (418KB) ( )   A method for estimation public transportation traffic zone OD was developed based on GPS data and IC card data. Public transportation will be divided into a closed-trip chain and a non-continuous trip chain. On this basis, the estimation of public transportation traffic OD can be calculated by integrating data mining technology and community residential transit trip rules. The appeal strength of bus stop was used to revise the disorder trip data. A method was proposed to calculate public transportation traffic zone OD based on GPS data and IC card data，and the data of Foshan center city was cited as an example to verify the reliability of this calculation method. On the whole, this method has realized the estimation of high precision trip OD matrix and it can be applied to urban transportation planning and management. References | Related Articles | Metrics

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Accurate Bus Travel Time Automatic Calculation Based on Multi-Source Data Cai Wenxue, Chen Guangwen, Luo Weihai 2015, 34(3): 122-126.  DOI: 10.3969/j.issn.1674-0696.2015.03.25 Abstract ( )   PDF (517KB) ( )   An accurate bus travel time automatic calculation algorithm was proposed based on multi-source data, including the cell tower location trajectory, public transit network and buses’ GPS trajectories. First, the cell tower location trajectory was collected by a smart phone. Second, a sliding time window based algorithm was applied to remove the disturbance data in the cell tower location trajectory caused by cell towers switching “ping-pong effect”. Third, the cell tower location trajectory was matched with the public transit network by their spatial correlation, to obtain locations where the passenger gets on and off the bus. Finally, the cell tower location trajectory was sequence compared with buses’ GPS trajectories, to obtain the passenger’s bus travel time. The experiment of bus travels in Nanhai, Foshan shows that, the error of the bus travel time obtained by the algorithm is within 1 minute, which can satisfy the precision requirement of public transit network adjustment and optimization. References | Related Articles | Metrics

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Existing Problems and Improving Measures for Passenger Guide Signs in Transport Hub Liu Xiaoming, Zhang Wei, Rong Jian, Wei Zhonghua, Zhao Xia, Wang Wei 2015, 34(3): 127-134.  DOI: 10.3969/j.issn.1674-0696.2015.03.26 Abstract ( )   PDF (2427KB) ( )   It’s mainly responsible for the bad transfer that passenger information demand mismatches information supply. The existing problems and improving measures for passenger guide signs were discussed from three aspects including the overall planning of guide sign system, the design and setup of guide sign system, and design standardization and coordination mechanism, based on analyzing the cognitive differences of guide signs at home and abroad. The common problems including that lack of connection between different sign systems, many signs and much information, information conflict, no hub location signs, and chaotic advertising in transport hub were analyzed. The results show that various basic design work should be standardized, and different departments should coordinate the demand. References | Related Articles | Metrics

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Fuzzy Comprehensive Evaluation for Effectiveness of Traffic Signs Chen Yuanjiang, Wang Yun 2015, 34(3): 135-141.  DOI: 10.3969/j.issn.1674-0696.2015.03.27 Abstract ( )   PDF (532KB) ( )   Influence factors of traffic sign effectiveness were identified from the three links of traffic sign design: layout design, structural design and arrangement design. The analytic hierarchy process was used to establish the effectiveness evaluation index system of traffic signs, and the effectiveness of traffic signs was analyzed with the aid of multistage fuzzy comprehensive evaluation method of mathematics. In the process, it’s 1 ~ 9 scaling method and Boolean matrix that were used to determine the weight of each level factors set, and the score evaluation at 70 points-boundary was put forward . The results of calculating example show that this method not only can evaluate the overall effectiveness of the traffic sign, but also can identify the main factors preventing it from working easily and conveniently. References | Related Articles | Metrics

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Design and Control of Electro-Hydraulic All-Wheel Steering System of Three-Axle Vehicle Yuan Lei, Liu Xixia, Liu Weiping, Jin Yi 2015, 34(3): 142-145.  DOI: 10.3969/j.issn.1674-0696.2015.03.28 Abstract ( )   PDF (595KB) ( )   Aiming at the problem of bad maneuverability at low speed and poor stability at high speed for an all-wheel steering three-axle vehicle, a set of electric hydraulic all wheel steering system was designed by the study on the steering system of the original vehicle. Aiming at the problem of the design of all-wheel steering controller, the 3-DOF mathematical model was established, the proportional feed forward and fuzzy control feedback controller were designed. The three degree step of front wheel angle was selected at the speed of 20 and 80 km/h, for comparison study on the simulation result for the double front axle steering vehicle and the all-wheel steering vehicle. The results show that the all-wheel steering controller can improve the response characteristics of the vehicle state parameters, reduce the vehicle sideslip rate, and improve the low-speed maneuverability and high-speed handling and stability of vehicle. References | Related Articles | Metrics

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Coordinated Control Optimization of Composite Braking System of Hybrid Electric Vehicle with Multi-Constraints Huang Daxing 2015, 34(3): 146-151.  DOI: 10.3969/j.issn.1674-0696.2015.03.29 Abstract ( )   PDF (1139KB) ( )   In view of the current existing problems of related to motor regenerative braking and hydraulic friction braking work together, composite brake system with double motor was designed. Based on hierarchical control, a braking force distribution strategy of composite braking system was developed, considering the restriction of the distribution ratio of braking force upon front and rear, ECE braking regulation, motor characteristic and energy storage characteristic, etc. Finally the simulation of control strategy of composite braking system in MATLAB/Simulink environment was done under three operating modes. The results indicate friction braking system and motor regenerative braking system can work coordinately and steadily in various operating mode under the regenerative braking control strategy, and show that the error of composite braking force and braking force driver demand reduce significantly, vehicle brake comfort has improved greatly. References | Related Articles | Metrics

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Displacement Boundary Modeling Method for Finite Element Analysis of Rigid Vehicle Axle Shao Songbiao, Gang Xianyue, Chai Shan, Li Shuang 2015, 34(3): 152-156.  DOI: 10.3969/j.issn.1674-0696.2015.03.30 Abstract ( )   PDF (1871KB) ( )   Proper boundary condition is the key process of the finite element analysis of axle. The point is to meet conditions that axle bears load in simply-support beam mode and constraint boundary should not lead to impractical local high stress areas. On the basis of the analysis of four common shaft constraint method, auxiliary support method and RBE3 multi-point constraints method were proposed, which can satisfy the accuracy requirements of deformation and stress analysis of axle better. The test conditions of auxiliary support method were very close to axle test, and RBE3 method had the feature of less sensitive to the border mesh. According to analyzing the trailer axle, the influence on calculation results of all boundary models was comparative studied. References | Related Articles | Metrics

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Modeling and Simulation of Commercial Vehicle Active Seat Suspension Pan Gongyu, Liu Yongtian 2015, 34(3): 157-161.  DOI: 10.3969/j.issn.1674-0696.2015.03.31 Abstract ( )   PDF (780KB) ( )   A half-car dynamic model was established based on the acquaintance and the analysis of the air suspension, the cab was taken into consideration in this new model. The optimal control method was applied to design the active seat suspension. Two dynamic simulation models of the passive seat suspension and the active seat suspension were set up by MATLAB/Simulink; the random road was taken as the input; the time domain and frequency domain results were compared. The simulation result shows that the active seat suspension can improve the vehicle seat performance and the study has provided the academic reference for the applications of the active seat suspension. References | Related Articles | Metrics

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Measurement and Control System Design of Electro-Hydraulic Power Steering System Test Bench Based on LabVIEW Xie Houxun, Gao Xiang , Xia Changgao 2015, 34(3): 162-166.  DOI: 10.3969/j.issn.1674-0696.2015.03.32 Abstract ( )   PDF (1159KB) ( )   According to the requirements of electro-hydraulic power steering system test bench, a measurement and control system was designed based on LabVIEW software. By using both data acquisition card and serial data communication technology, the system not only can acquire test data of steer angle, steer torque and hydraulic pressure, but also can acquire data of drive BLDC motor current and speed. The test bench system can simulate working condition of electro-hydraulic power steering system better. Experimental results demonstrate that the system can control the motor pump speed and acquire test data successfully. It shows the system has achieved its design goals. References | Related Articles | Metrics

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Combustion Characteristics Analysis on Pre-mixed Methanol Through Intake Manifold of Diesel Engine Du Jiayi, Lu Yongjia, Zhang Weixun, Zhang Dengpan, Yuan Yinnan, Xu Yi 2015, 34(3): 167-170.  DOI: 10.3969/j.issn.1674-0696.2015.03.33 Abstract ( )   PDF (746KB) ( )   A turbocharged diesel engine was altered to a duel fuel engine with intake pre-mixed methanol. Heat release rate calculation program of duel fuel engine based on cylinder pressure was written by Matlab. And test was conducted to study the duel fuel engine. The results show that while the methanol mixing ratio increases, ignition delay period of mixing fuel, the ratio of pre-mixed combustion and the peak of heat release rate increase, but the combustion duration decreases at all loads of low speed and middle and low loads of high speed. At high load of high speed, the timing of combustion is advanced significantly and the heat release rate curve shows multiple peaks when the methanol mixing ratio is high. The heat release time can be delayed; the peak of heat release rate and the maximum rate of pressure rise can be decreased by delaying fuel injection advance angle. References | Related Articles | Metrics

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Study on Modeling of Equal Arm Balance Suspension and Simulation of Vehicle Ride Comfort Based on ADAMS Jiang Haobin, Zhang Zehua, Li Longchen, Tang Chuanzheng, Mao Weiwei 2015, 34(3): 171-174.  DOI: 10.3969/j.issn.1674-0696.2015.03.34 Abstract ( )   PDF (1026KB) ( )   According to the equal arm balance suspension between three and four axle of a heavy van truck, an efficient and flexible method was presented, which was based on the idea of discrete beam method and used in a combined method of Leaf Spring of ADAMS/Chassis and ADAMS/View. Based on ADAMS/View, the equal arm balance suspension dynamic model, the front suspension dynamic model and the vehicle dynamic model were established, then vehicle ride comfort random road input running test was carried out. The results of calculation agreed with the results of experiment. It proves the feasibility of the modeling method of the equal arm balance suspension and the effectiveness of the vehicle dynamics model. It provides helpful reference for the dynamic model of multi-axle heavy truck and the simulations of vehicle ride comfort. References | Related Articles | Metrics

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Motorcycle Frame Optimization Based on Multidisciplinary and Multi-Objective Genetic Algorithm Mo Mingli 2015, 34(3): 175-178.  DOI: 10.3969/j.issn.1674-0696.2015.03.35 Abstract ( )   PDF (581KB) ( )   The finite element model of motorcycle frame was established. And the strength, stiffness, the free modal and the constraint modal were calculated and the results verified that the 1D tube model can be instead of the 2D shell element model for the simulation calculation. Orthogonal experiment was used to analysis the sensitivity of design variables and the best was select. With the frequency of free modal and constraint modal being the objective for optimization, and the strength, stiffness and lightweight being the constraint conditions, multidisciplinary and multi-objective optimization for the vibration was established based on the multi-objective genetic algorithm. The optimal solution was obtained and the vibration characteristics of structure were enhanced. References | Related Articles | Metrics