交通运输工程学报

Dynamics simulation model of double united articulated container flat vehicle

WANG Yong, CENG Jing, WU Ping-bo

Abstract: Based on the characteristic that two carbodies of articulated container flat vehicle are connected with an articulated connector and a common articulated bogie is used at articulated position, a nonlinear mathematic model of the vehicle was established by using NUCARS dynamics simulation software, the nonlinearities were considered resulted from wheel/rail contact geometry, wheel/rail creep forces, nonlinear suspension characteristics and articulated connector, and its running stability, curve negotiating performance and riding comfortableness were studied by using numerical simulation method. Analysis result shows that the vehicle has enough high hunting critical speed, its curve negotiating performance indices are in the safe range required by GB/T 5599-1985, and the lateral and vertical indices of riding comfortableness are less than 3.5 at the running speed range of 120 km·h^-1, so the vehicle has eximious dynamics performance, and meets the running requirement at 120 km·h^-1.More>

2008, 8(1): 1-4.

FullText HTML (115) PDF (561KB) (217)

Pseudo-excitation analysis method of riding quality for maglev vehicle

ZHOU Jing-song, LI Da-guang, SHEN Gang, REN Li-hui, ZHANG Xiang-wei

Abstract: In order to facilitate the riding quality analysis of multi-input tracked vehicle, a new analysis method was proposed based on pseudo-excitation algorithm. When vehicle system was subjected to multi-point coherent excitations, the method simplified the calculation of response PSD matrix for a MIMO(multi-input and multi-output) system into the product of two vectors, and with response PSD matrix and inverse analysis technique, the riding index of tracked vehicle can be obtained quickly. A vertical dynamics model of maglev vehicle was built based on TR08 vehicle, and its response spectrums were analyzed with the method. The Sperling index is 1.653 at the center of car body in frequency domain, the rank of riding quality is fine, the amplitude spectrum and time history of the response can be obtained by using inverse analysis technique, and the analysis procedure is convenient and fast, so the method is feasible.More>

2008, 8(1): 5-9.

FullText HTML (101) PDF (322KB) (387)

Effect of braking heat on axle-pan conjunction for high-speed locomotive

YAO Yuan, ZHANG Hong-jun, LIU Jin-hua

Abstract: A heat transfer model of axle-pan brake device for high-speed locomotive was put forward by using ANSYS, contact thermal resistance and the coefficients of heat conductivity in gap and face were computed, the temperature field property of the device was studied, and the effect of braking heat on the interference fit of the device was analyzed. Computation result shows that the rational gap between brake hub and out hollow axle is helpful to increase the thermal resistance and reduce the temperature effect, its recommending value is within 0.5-1.5 mm; average contact pressure on interference fit face decreases by 5.9%-6.6% at the end of braking when the thickness of brake hub is rational, which may decrease the heat effect, and its recommending value is 8 mm.More>

2008, 8(1): 10-14.

FullText HTML (95) PDF (468KB) (1047)

Self-powered active lateral suspension system of railway vehicle

OUYANG Dong, ZHANG Ji-ye, ZHANG Wei-hua

Abstract: In order to decrease the wastage of external energy for active suspension, a self-powered active suspension(SPAS) was designed, a reduced half carbody lateral suspension dynamics model of railway vehicle was established, the LQG controller was designed, the conditions insuring the energy balance of the suspension system were analyzed by using stochastic vibration principle, and its operating performances were simulated by Matlab/Simulink. The result indicates that self-powered active suspension has better isolated performance than semi-active and passive suspensions, and it realizes active vibration control and energy regeneration synchronously when the equivalent damping coefficient of DC motor actuator is greater than its critical value.More>

2008, 8(1): 15-18.

FullText HTML (71) PDF (489KB) (217)

Fitting method of track spectrum for main line railway in China

CHEN Xian-mai, WANG Lan, TAO Xia-xin, CUI Gao-hang, CHAI Xue-song, YANG Feng-chun, WU Wang-qing

Abstract: In order to get the track spectrum that reasonably indicates the irregularity character of main line railway in China, a fitting approach of track spectrum was set up. In the approach, track irregularity data were computed to get track spectrum, track spectrum was preprocessed by using smoothness method and interpolation method, the effect of biggish salient waveforms on track spectrum was decreased by using simple elimination method, every adjacent 3-point average method and envelope-average method, the fitting precision of track spectrum was improved by using cubic spline interpolation method, and track spectrum was fitted by using nonlinear curve-fitting optimization algorithm in the least-squares sense. Fitting result shows that fitting track spectrum can accurately indicate the track irregularity character of main line railway in China, so the approach is feasible.More>

2008, 8(1): 19-22.

FullText HTML (106) PDF (431KB) (1273)

Effect of differential brake on braking stability of automobile

WU Xiao-dong, LI Bing, ZHAO Xue-zeng

Abstract: To improve the braking safety of automobile, the mechanics characteristic of differential brake was analyzed, automotive subsystems models were built by applying ADAMS/Car, automotive mechanics simulation model was built by setting some main subsystems, beeline braking stability and turning braking stability were simulated, and the effect of differential brake on the stabilities was studied. Simulation result shows that differential brake can reduce the side-slip angle of mass center for automobile, and improve its braking stability when turning braking, but the effect of automotive mass on its braking stability is great, so the distribution mode of braking force and the effect of mass change should be considered while applying differential brake.More>

2008, 8(1): 23-26.

FullText HTML (67) PDF (468KB) (557)

Comparison of high-temperature rheological evaluation indices for bitumen

ZHOU Qing-hua, SHA Ai-min

Abstract: In order to effectively evaluate the high-temperature performance of asphalt mixture, rotary viscosity test, dynamic shear rheometer test and repeated creep test were conducted, viscosity, rut factor and creep model index were tested, the data of high-temperature creep test were fitted by using Burgers model, and the relativities between three rheological indices and the high-temperature performance were analyzed. Analysis result shows that rut factor doesn't fit to evaluate the high-temperature performance of modified asphalt mixture, the relative degree between creep model index and the dynamic stability degree of asphalt mixture is maximum, gets to 0.988 7, so creep model index can reflect the high-temperature performance of all kinds of asphalt mixtures accurately..More>

2008, 8(1): 27-30.

FullText HTML (44) PDF (594KB) (364)

Evaluation index of temperature susceptibility for asphalt

MA Xiang, NI Fu-jian, CHEN Rong-sheng, ZHAN Qian

Abstract: To choose the reasonable evaluation index of temperature susceptibility for asphalt, the penetration indices of asphalt were calculated through the penetrations at 15, 25 and 30 ℃ and the penetration and softening point at 25 ℃ respectively, they were applied to evaluate the temperature susceptibilities of two kinds of common asphalts and three kinds of polymer modified asphalts(PMA), the dynamic complex viscosities of the asphalts under different temperature conditions were tested by using dynamic shear rheometer, and their relationships between viscosity and temperature were analyzed. Analysis result shows that there are linear correlations between viscosity and temperature for normal bitumens within 15~60 ℃, their temperature susceptibilities are a constant, while the relationships of viscosity and temperature for PMA satisfy WLF equation, their temperature susceptibilities change with temperature. So the temperature susceptibility of common asphalt may be expressed by using penetration index, but temperature condition must be appointed to estimate the temperature susceptibility of PMA.More>

2008, 8(1): 31-35.

FullText HTML (71) PDF (615KB) (240)

Comparison of PSD method and IRI method for road roughness evaluation

WU Qing-xiong, CHEN Bao-chun, XI Ling-zhi

Abstract: In order to analyze the relationship between power spectral density (PSD) method and international roughness index (IRI) method in evaluating road roughness, AR model was adopted to simulate road roughness condition for satisfying PSD, and Newmark β method was employed to calculate IRI values, the relationship formula between PSD method and IRI method was determined by using least square method. Analysis result shows that the relationship between IRI value and road roughness coefficient meets power function, and to correspond to IRI values in quality inspection and evaluation standards for highway engineering (JTG F80/1-2004), a "very good" item of road roughness evaluation should be complemented into technical specifications of maintenance for highway (JTJ 073-96).More>

2008, 8(1): 36-41.

FullText HTML (156) PDF (764KB) (847)

Controlling factors of construction on polymer cement concrete

XIONG Jian-ping, SHEN Ai-qin

Abstract: The influences of construction controlling factors, such as forming methods, maintenance modes and environmental conditions, on the road performances of polymer cement concrete(PCC)were studied by laboratory experiment and real measure, and the effect mechanisms of different maintenance modes on the performances of PCC were analyzed through scanning electron microscopy(SEM). Analysis result shows that to acquire the best mechanical property, the special mixing technology and longer vibrating time are necessary; the more polymer content is, the less the standard maintenance days are, which results from the variety of PCC film's integrity with different polymer contents and maintenance modes, so that it provides corresponding different water-held capabilities and flexural strength effects; when environmental temperature or wind speed is higher, the fluidness of PCC reduces and pavement is easy to crack after hardening.More>

2008, 8(1): 42-46.

FullText HTML (56) PDF (702KB) (455)

Design of spatial database on natural zoning for highway in China

XU Jin-liang, LI Chao, YANG Hong-zhi

Abstract: In order to realize the quantification and automatization on natural zoning for highway in China(NZHC), the spatial database structure of NZHC was designed from the concept, logic and physical aspects, the technology of spatial data engine was used, the spatial database was built based on the data storage and management function of large-scale relationship database management system, the difficult degree indices of highway engineering(DDIHE) were calculated by using multi-factor weight method based on the database. Analysis result shows that altitude, terrain slope, landform incision depth, landform incision density, hard rock coverage and vegetation coverage are main factors affecting DDIHE distribution, the map of DDIHE can visually reflect DDIHE in different regions from the view of physiognomy. Obviously, the establishment of the database realizes the quantification analysis mode of NZHC, solves the storage and management problem of mass spatial data.More>

2008, 8(1): 47-53.

FullText HTML (78) PDF (1180KB) (785)

Updating coupling method of hydration heat temperature damage for concrete box girder

ZHANG Gang, HE Shuan-hai, SONG Yi-fan

Abstract: In order to prevent the earlier crack and temperature dash phenomenon of pier-on mass for concrete box girder during construction, hydration heat temperature damage model for concrete was studied, the time-dependent effect for modulus of elasticity and boundary conditions were comprehensively considered, an updating coupling method of hydration heat temperature damage for the girder was put forward by using linear iteration method, the whole damage field with the variation procedure of temperature load was computed, and the damage laws were analyzed based on the time-dependent relation curves of the field. Comparison between calculated result and measurement result shows that the deviation of the hydration heat temperatures is less than 10%, the appearing time of the difference peak value for the hydration heat temperature delays about 32 h compared with the temperature peak value, the peak values of the equivalent strain for the girder and the temperature difference appear synchronously, the hydration heat temperature damage degree is linear to the equivalent strain, their time-dependent effect laws are similar, so the model is feasible.More>

2008, 8(1): 54-60.

FullText HTML (69) PDF (982KB) (492)

Influence of cross current on ship navigation in inland waterway

CAO Min-xiong, MA Ai-xing, WANG Xiu-hong, CAI Guo-zheng

Abstract: To ensure ship getting through cross current region safely and determine the limited value of lateral velocity in inland waterway, the test of remote-control self-propelled model ship was carried out in flume, the influence of lateral velocity on ship navigation was researched, the empirical formulas were presented, which reflected the influences of cross current on cross drift velocity, drift angle, the width of sailing path and drift distance, the limited values of lateral velocities in Ⅳ and Ⅴ class waterways were analyzed. Analysis result indicates that the influence extend of cross current on ship navigation decreases with the increase of bank velocity and ship size(channel class), increases with the increase of lateral velocity and the region length, and relates to driver's navigation experience and ship's initial position; in Ⅳ and Ⅴ class waterways, for restricted route, the limited values of lateral velocity in the range of one ship are 0.48, 0.58 and 0.70 m·s^-1 when the values of bank velocity are 2, 3 and 4 m·s^-1 respectively.More>

2008, 8(1): 61-67.

FullText HTML (54) PDF (786KB) (775)

Fault-tolerant control method of automatic transportation system for coal wharf

GU Wei, CHU Jian-xin

Abstract: For the improvement of reliability and safety for coal wharf's automatic transportation system, a fault-tolerant control method was put forward. Fault detection and diagnosis(FDD) was constructed by using radial basis function network(RBFN), the mapping relationship between FDD and control rule reconstruction(CRR) was built by searching fault-tolerant cases, and CRR was realized. Applying result shows that the proposed method obviously improves the safety and reliability of the system, its fault discrimination ratio is more than 97%, fault misdiagnosis ratio is less then 1%, and the validity of the system rises from 90% to 98%.More>

2008, 8(1): 68-72.

FullText HTML (63) PDF (591KB) (232)

Detection method of weak fault signal based on local wave and chaos

WANG Feng-li, YU Hong-liang, DUAN Shu-lin, MA Xiao-jiang

Abstract: In order to accurately diagnose early fault of rotor system with weak signal, a new signal detection method based on local wave method associated with chaos oscillator was presented. Weak fault signal was divided into finite local wave components with different simple-intrinsic modes, so that signal was separated from noise. The components were inputted into chaos oscillator, and were transformed from chaotic states to large-scale periodic states, so that weak signal can be identified under low signal-noise ratio through distinguishing the characteristic frequency of signal. Fault diagnosis result shows that the method is feasible, can accurately diagnose early eccentricity fault of rotor system.More>

2008, 8(1): 73-77.

FullText HTML (76) PDF (745KB) (589)

Site planning method of u-turn followed by right-turn based on microsimulation

ZHANG Ning, CHEN Kai, GAO Chao-hui, HUANG Wei

Abstract: In order to improve the efficiency of u-turn followed by rlght-turn based on ensuring the running safety of vehicles, its application conditions were analyzed, its typical application environment was difined, and two theoretical planning methods were put forward based on referring to overseas correlative specification and intersectional signal timing design method respectively. In typical application environment, the methods were evaluated by using microsimulation software. Simulation result shows that compared with left-turn, the average delays of u-turn reduce by 3.8 and 6.8 s respectively. Obviously, optimizing intersectional signal timing based on referring to correlative specification can ensure traffic safety and improve traffic efficiency.More>

2008, 8(1): 78-82.

FullText HTML (77) PDF (334KB) (288)

Estimation models of distribution functions for travel time value with maximum entropy principle

YU Li-jun, XU Jian-min

Abstract: In order to improve the goodness-of-fit accuracy of statistical distribution for travel time value with its stylebook data, maximum entropy principle was combined with probability-weighted moments (PWM) and statistical ordinary moments (SOM)(≤6) respectively, two new statistical distribution models were proposed, and parameter estimation was carried out by using probability-weighted moments and statistical ordinary moments. Simulation result shows that when the number of stylebooks is less than 30, the average relative errors between exact values and estimating values range from 10% to 35% and from 20% to 80% respectively, but the statistical accuracies are similar on large sample size condition, so the estimating accuracy with probability-weighted moments is higher. Obviously, the proposed methods are useful to promote parameter estimating accuracy, may predict the split ratios of traffic modes effectively, and analyze the influence of transportation pricing policy on travel behaviors.More>

2008, 8(1): 83-88.

FullText HTML (75) PDF (647KB) (227)

Estimation method of average travel time for road sections

ZHANG He-sheng, ZHANG Yi, HU Dong-cheng

Abstract: In order to availably utilize loop data and estimate the average travel time of road sections accurately and quickly, an estimation method of average travel time was proposed. Average travel time was divided into average running time, average queue delay and average crossing intersection time. Average running time was calculated by using average speed based on taking account of the installation type differences of loops. Piece-wise time homogeneous Poisson process was used to describe the arrival and departure processes of vehicles, Markov model was used to describe the queue process of vehicles, birth and death process was used to model vehicles' number in queue, and two kinds of average queue times with initial queue and no initial queue were computed. Average crossing intersection time was computed based on average vehicle length and saturation volume rate at intersection. Computation result shows that the relative error between the measure value and computation value of average travel time is less than 12%, so the method is feasible.More>

2008, 8(1): 89-96.

FullText HTML (74) PDF (786KB) (355)

Multi-user and multi-mode assignment model of mixed stochastic traffic balance

HAN Yin, YUAN Peng-cheng

Abstract: In order to realize the stochastic-balanceable assignment of mixed traffic flow in traffic network, the theory of routing selection and the conditions of network equilibrium were analyzed based on multi-user and multi-mode on the conditions of generalized cost and traffic information, a stochastic-balanceable assignment model of mixed traffic flow was put forward by using mathematical programming theory on the condition of traffic information, and the equivalence and uniqueness of the solution for the model were demonstrated. Computation result shows that the solution of the model quickly converges when the possessive ratio of traffic information market is 30%, and the iteration times are only 6, which indicates the effect degrees of traffic information on traffic mode choice and traffic flow assignment, so the model is feasible.More>

2008, 8(1): 97-101.

FullText HTML (81) PDF (321KB) (311)

Appropriate road grade model of road network in small city

CHEN Xue-wu, LIU Fei, HU Qi-zhou

Abstract: In order to determine the appropriate road grade in small city, the supply minimum of urban road resources was taken as objective function, the rank, function and cross section of urban road were considered, total road length, traffic supply-demand matching relationship, road capacity and road area supply were taken as constraints, a reasonable road grade model of road network in small city was put forward, and road network in Shangyu City was analyzed by using the model. Computation result shows that an optimal solution of road grade for main trunk road, secondary trunk road and branch road in the city is 1.00∶1.56∶2.56, which indicates the optimization of road network in the city, and the model is rational.More>

2008, 8(1): 102-105.

FullText HTML (46) PDF (424KB) (569)

Analysis and evaluation of reliability for stochastic and dynamic transport network

LI Zhi-chun, ZHU Dao-li

Abstract: In order to analyze the travel and parking behaviors of commuter in stochastic and dynamic transport network, a fixed point model was set up by using network equilibrium rule and fixed point theory, and a schedule reliability and a parking reliability were put forward to measure the stability of the network. It is found that the location of parking facility and walking distance have significant influence on the levels of both the schedule reliability and parking reliability of commuter, specifically, commuters often park their cars at the nearer locations from their workplaces among multiple parking locations with the same parking charges; during traffic peak period in the morning, the parking reliability of farther location is higher than that of nearer location. Analysis result shows that the indices can effectively measure the service levels of road network and parking facilities in everyday different periods.More>

2008, 8(1): 106-112.

FullText HTML (38) PDF (434KB) (228)

Heuristic genetic algorithm of vehicle routing problem with time windows

ZHAO Jian-you, WU Li-qing, LIU Da-xue

Abstract: In order to reasonably arrange vehicle routes according to time request in transportation production, a mathematical model for vehicle routing problem with time windows(VRPTW) was constructed, and a heuristic genetic algorithm was put forward to solve it. In the algorithm, chromosomes were constructed, initial groups were produced and optimized, their capability was estimated by the existent ability of individual, and the optimized value was computed. The number of evolving offspring is 100, operating time is 10, VRPTW with one center depot and eight branch depots was solved by correspond program. The result indicates that goods are distributed with three trucks in three routes, total distance is 483 km, total time is 15.55 h, there is no idle time for truck, and all warehouses are served on time. Obviously, the algorithm is effective and feasible.More>

2008, 8(1): 113-117.

FullText HTML (76) PDF (594KB) (768)

Relationship between information quantity and visual cognition of traffic guide sign

DU Zhi-gang, PAN Xiao-dong, GUO Xue-bin

Abstract: In order to ascertain the rational road name number of traffic guide sign, using EMR-HM8 eye tracker system, the relationship between information quantity and visual cognition of traffic guide sign was analyzed based on many indoor simulation experiments, visual cognition of guide sign with target road name was compared with that with non-target road name. Analysis result shows that when the road name number of guide sign is 2~7, the reaction time of visual cognition is less than 2.50 s and it has significantly linear positive relationship with road name number; the visual cognition time of target road name sign is less than that of non-target road name sign obviously, and their average difference is 0.52 s. The suggested value of visual cognition reaction time is 2.00 s when road name number is less than 5 and the vehicle speed is not bigger than 50 km·h^-1; the suggested value is 2.50 s in other condition; the rational road name number of guide sign is less than 5.More>

2008, 8(1): 118-122.

FullText HTML (57) PDF (631KB) (909)

Dynamics system of simulation and identification for road accident black spot

SHAO Yi-ming, HU Yan, XU Jin, YU Zhi-gang

Abstract: In order to directly and objectively identify road accident black spot from road conditions coupled with vehicles, a dynamics system of simulation and identification for road accident black spot was developed, vehicle model, road model and vehicle-road coupling model were set up, a identification method of road accident black spot was put forward, and the feasibility of the system was validated by using dynamics simulation examples when vehicle running on small cling coefficient road and braking on curve road. The running states of vehicle were controlled by using close-looped control method, the character parameters of running safe states for vehicle were chosed according to road characters, and road accident black spot was identified according to the curves of the parameters. Dynamics simulation result shows that the identification result is consistent with the accident statistic analysis result from the department of point constable when main considering road factors, so the system is feasible.More>

2008, 8(1): 123-126.

FullText HTML (88) PDF (649KB) (223)

User Center

Journal Info

Collection of Source JournalsMore>

2008 Vol. 8, No. 1

Search Type

Search Journal

LinksMore>