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ISSN 1674-2850
CN 11-9150/N5
 
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June 30,2012
Volume 5,Issue 12
Pages -
Subject Area:
 
Title: Prediction for ship resistance considering sinkage and trim
Authors: QIN Jiangtao, GAO Gao
PP: 1192-1197
Abstract: In this paper, RANS solution is adopted to simulate the flows around surface ship, and Eulerian-explicit difference scheme is used to solve time history of navigation gesture. The result shows that the approach is feasible to predict the resistance of such kind of ships.
Keywords: naval architecture and ocean engineering; ship resistance; computational fluid dynamics; moving mesh; navigation state
 
Title: Modeling by generalized kinetics of falling object in vehicle crash accident
Authors: XU Hongguo, DU Xuejing
PP: 1185-1191
Abstract: In order to develop the scattered falling objects kinematics model caused by the vehicle crash of traffic accident, based on contact dynamics, this paper puts forward the judging conditions for combined movement (involves bounce, sliding and rolling) of falling objects contacting to road surface after crash. Combined with the material properties of falling objects, the generalized kinetics model of falling object in vehicle crash is established. Through the vehicle crash simulation test, the effect of the model is validated. The results show that the relative error between calculated and simulated value of falling object generalized kinematics model is not more than 7%. The model makes up for the lack of previous model, and will expand the reconstruction of crash accident falling objects in the traffic accident.
Keywords: vehicle operation engineering; traffic accident; crash; falling objects; generalized kinematics; modeling
 
Title: Kalker coefficient of wheel/rail creep forces on non-steady states
Authors: REN Lihui, XIE Gang
PP: 1176-1184
Abstract: The creep forces on non-steady states due to sinusoidally varying creepages were computed by Kalker 3D rolling contact theory and the system identification method of frequency response was used to fit unsteady creep force and creepage. Calculation result shows that under small creep condition, the creep forces on non-steady state can still be computed by the Kalker linear method, but in which the Kalker coefficient C11 and C22 are not constants but one order transfer function of wavelength ratio L/a, and C23 is three order transfer function of wavelength ratio L/a. The non-steady states creep forces due to creepage can be calculated according to extensional Kalker coefficient.
Keywords: rail transportation; wheel/rail contact; creep force; non-steady state; Kalker coefficient
 
Title: Effect of elasticity modulus of cement asphalt mortar on spatial vibration of high-speed train and slab track system
Authors: XIANG Jun
PP: 1171-1175
Abstract: According to the analysis theory of spatial vibration of high-speed train and slab track system, the effect of elasticity modulus of cement asphalt mortar on spatial vibration responses of the system was studied. By using the ANSYS, internal forces of the slab track under the action of wheel loads and temperature load were calculated and the effect of elasticity modulus of cement asphalt mortar on them was also analyzed. The results show that the cement asphalt mortar with high strength and low-elasticity modulus should be selected as the fill-in layer under the slab; the cement asphalt mortar layer not only has the supporting, filling-in, force withstanding and transmitting functions, but also has the certain elastic function. At last, the principle for selecting the rational value of the elasticity modulus of the cement asphalt mortar was presented.
Keywords: railway engineering; slab track; cement asphalt mortar; elasticity modulus
 
Title: The express transportation of Beijing subway: research of without stopping in the peak hours at Nanlishilu station
Authors: ZHAO Peng, MA Wenjie, WANG Xuesong, HAN Baoming
PP: 1163-1170
Abstract: Learning from foreign advanced operation concept: express transportation of urban mass transit, combined with the case of physical facilities of China’s subway (Beijing Metro), the feasibility of without stopping in the passenger transport peak hours at Nanlishilu station of Beijing Metro Line 1 was researched by using the quantitative calculation and later state evaluation and comparison, And the methodology of how to select the station which should be crossed was completed.
Keywords: urban mass transit; express transportation; without stopping in the peak hours; time value; Nanlishilu station
 
Title: Simulation analysis of traffic behavior based on drivers’ temperament
Authors: GUAN Jinjin, LI Yang, LI Yinsheng, MAO Ling, XU Junmei
PP: 1156-1162
Abstract: Based on safe driving principle, this paper explores action switching under different driving modes and different temperament type of drivers in higher nervous activity. Taking four intersections constituted by Tianzhi Road to Qianshan Road intersected with Huangshan Road for example, traffic data related to associated signals intersection sequence is obtained through field research. Depending on VISSIM, traffic calculation theory and the method of traffic situation signal timing and traffic engineering management, the original traffic signal control scheme is improved, then the results are simulated, optimized and compared.
Keywords: intelligent transportation; temperament type; traffic flow parameters; data acquisition and processing; simulation on VISSIM
 
Title: The dynamic simulation study of ship shaft system
Authors: ZHANG Shengdong, LIU Zhenglin, WANG Xiang, CHANG Ning
PP: 1151-1155
Abstract: Based on the propeller’s type value table, two-dimensional coordinate was transformed into three-dimensional point coordinates, the three-dimensional model of propeller was established through programming. The propeller blade surface three component force and three component torque were simulated and got using computational fluid dynamics (CFD) software. Finite element software was used to get modal neutral files (MNF) of tail bearing and shaft. The influence of tail bearing and shaft at the moment of main engine start was discussed. The co-simulation using finite element software ANSYS and multi-body dynamics simulation software ADAMS was carried out, and the problem of numerical divergence was resolved successfully.
Keywords: vehicle operation engineering; ship shaft; dynamic simulation; ADAMS; ANSYS
 
Title: Detection technology of moving objects parameters in road crossing based on videos
Authors: LU Guangquan, LIU Miaomiao, XIA Shaojun, DENG Cheng
PP: 1144-1150
Abstract: By taking Visual C++ and OpenCV as tools and processing video image sequences gathered by one camera under low angle, suitable prospect examination method of plane intersection was selected. Through making improvement to OpenCV track template, the procedure suited to movement parameters examination of intersection vehicles was developed. The Kalman filtering was used to process movement parameter, and the detected data were more reliably. The research results could be applied in the transportation conflict theoretical analysis and traffic safety appraisal.
Keywords: traffic engineering; intersection safety; video processing; vehicle motion parameter detection; Kalman filtering
 
Title: Influence of horizontal load and overload on the mechanics response of asphalt pavement
Authors: LIU Shengjie, ZHENG Nanxiang
PP: 1138-1143
Abstract: To analyze the response of pavement structure under different loading, based on the semi-rigid base asphalt pavement, and considering the different horizontal load coefficients and overloading rates, the deflection, lateral deformation on the surface, the compressive stress, shear stress of inner pavement structure was studied by the program of BISAR 3.0. The result shows that the horizontal load impacts little on the deflection of the surface, but impacts much on the lateral deformation, when the load is standard. The maximum compressive stress and the maximum shear stress appear at 5 cm below the surface, and when the overloading rate is 100%, the maximum compressive stress appears at 1.5 cm below the surface, the maximum shear stress changes following the horizontal load coefficients.
Keywords: road engineering; mechanical response; asphalt pavement; horizontal load; overloading
 
Title: The research of crack evaluation criteria of epoxy asphalt pavement on steel bridge deck based on BOTDA
Authors: QIAN Zhendong, XU Jing, HAN Guangyi
PP: 1132-1137
Abstract: Cracking evaluation index of epoxy asphalt pavement on steel bridge deck was studied in this paper by the method of BOTDA technology. Based on the three-point bending fatigue test with the indoor incision composite beam, the strain values of all stages of crack propagation were monitored, then cracking initiation point and extension instability point of epoxy asphalt pavement on steel bridge deck were defined. Cracking evaluation indexes of epoxy asphalt pavement on steel bridge deck were gotten according to the preventive protection requirements. The results may provide a theoretical basis for maintenance of epoxy asphalt pavement on steel bridge deck.
Keywords: road and railway engineering; steel bridge deck; cracking evaluation index of epoxy asphalt pavement; BOTDA; three-point bending fatigue test
 
Title: Simulation study of the vehicle anti-lock braking system
Authors: ZHANG Yuandong, WANG Jianzheng
PP: 1124-1131
Abstract: The paper established simulation models of anti-lock braking system (ABS), including single-wheel vehicle model, tire model, brake system model, road model and control model. Using the method which combines the vehicles principle of dynamics and the Matlab/Simulink simulation, the establishment obtains the Matlab/Simulink simulated program module. The simulation has analyzed the ordinary braking system and is loaded with guards against holds in the ABS vehicles brake process various parameters dynamic change rule. Simultaneously passing through with the monowheel experimental study contrast which has confirmed the simulation computation result is very good, providing sets of effective methods for the ABS brake process research.
Keywords: vehicle engineering; vehicle; anti-lock braking system; simulation
 
Title: Optimized research on ABS logic threshold of passenger car based on genetic algorithm
Authors: SUN Xinfei, ZHAO Kegang
PP: 1119-1123
Abstract: In order to optimize multiple logical thresholds, this paper analyzes the control mechanism of logical threshold of wheel acceleration and deceleration of anti-lock braking system (ABS). Considering the working characteristics of passenger vehicle, a vehicle dynamics platform in Carsim is introduced, then the Matlab/Simulink is used to run a combined simulation with Carsim. A genetic algorithm is run to optimize the logical threshold of the front and the rear wheels. It is proved that this method is practical and effective by relative validation procedures.
Keywords: automotive engineering; anti-lock braking system; threshold control; genetic algorithm; parameter optimization
 
Title: Finite element analysis of a radial tire
Authors: ZHANG Jian, WANG Guolin, ZHU Changshun, FU Naiji
PP: 1114-1118
Abstract: This paper aims to some radial tire which has complexity of geometry, internal structure and material breed and property. Yeoh mechanism model and Rebar model were used to simulate rubber and cord. Finite element analysis (FEA) was used to simulate assembly, shrink, inflated pressure and vertical load case, and the process of tire-ground under static contact was analyzed. The computing results were compared with experiments. Equivalent stress, shearing strain and strain energy potential were used to estimate the critical regions of the tire. The value of stress, strain and strain energy potential were recorded at every part of tire. It lays a foundation for further thermal fatigue analysis and plays a guiding role at improving the structure of type.
Keywords: vehicle engineering; radial tire; finite element analysis; Yeoh; Rebar
 
Title: Modeling and control of vehicle magnetorheological seat based on bond graph
Authors: ZHAO Qiang, GAO Fang
PP: 1108-1113
Abstract: A human body-seat 5-DOF physical model and a modified Bouc-Wen model of magnetorheological damper are discussed and established in this paper. Based on these two models, a power bond-graph model is further presented for the vehicle magnetorheological seat. This model is completed with 20-Sim software. A PID control algorithm is designed based on this bond graph model. Simulation showed that this model can present an accurate description to the dynamic characteristics of the whole system. This model can present a valued reference for the semi-active control of human body-seat.
Keywords: vehicle application engineering; magnetorheological seat; bond graph; model; control
 
Title: A review of impact biomechanics research related to automobile safety
Authors: XU Zhongming, ZHANG Liang, LIU Shiqian
PP: 1101-1107
Abstract: In this paper, the concepts and contents of the science of impact biomechanics are introduced, and the injury mechanisms, injury criterion and tolerance levels in various parts of human body are summarized. Then the research methods applied in impact biomechanics are briefly introduced and some suggestions are proposed for further development in the area of impact biomechanics in China.
Keywords: impact biomechanics; injury criterion; reviews; tolerance level; test dummy