Applied Mechanics and Materials Vols. 505-506

Abstract: We discuss the dynamic traffic network equilibrium system problem with elastic demands by way of a quasi-variational inequality.We introduce the equilibrium definition with elastic demands based on Wardrops principles when there are some internal relationships between different kinds of goods which transported through the same traffic network. Moreover, we also prove that the equilibrium conditions of this problem with elastic demands can be equivalently expressed as a system of evolutionary variational inequalities. By using the fixed point theory and projected dynamic system theory, we get the existence and uniqueness of the solution for this equilibrium problem with elastic demands. Finally, some numerical examples are given to illustrate our results.

Abstract: The vehicle data currently collected from various terminal devices has the shortcomings of large amount of information, strong heterogeneity, data conflicts and other issues. The existing data fusion model has cross and not completely consistent with the characteristics and application requirements of the field of transportation, and are not suitable for the information features of this field. To solve this problem, this paper proposes a GFIC-I data fusion model and methods suitable for the applications of automotive transportation field. The model describes five key steps of data fusion. Through the fusion of real-time data and historical data in time and spatial, the integrated data is calculated, which has lower ambiguity and higher accuracy and can improve the effective uses of the data and provide professional guidance for data fusion applications.

Abstract: For the depth of deep buried station, the safety of the station and passengers should be seriously taken into consideration. This paper analyses the features of deep buried station and the influence of these features to the station safety management. With simulation method, the maximum optimal passenger capacity and evacuation time could be calculated, and bottle-neck in the station design could be found. From the comparison of the outcome between deep buried station and normal station, deep buried stations have longer evacuation time and lower optimal passenger capacity, which should be paid special attention to in the operation.

Abstract: Massive expressway toll data contained lots of valuable information. However, the skills of mining and analyzing toll data were limited currently. This study explored the modeling method of road network travel time reliability based on massive toll data. Firstly, this study obtained travel time data sample of each link at different months, and analyzed travel time statistical properties preliminarily. Secondly, this study used normal distribution, gamma distribution and Weibull distribution to fit travel time data sample, and different statistical indicators were involved to measure the fitting effect. Fitting results showed that normal distribution for link travel time was more rational and acceptable than the others. Thus, this study established link travel time reliability model, and proposed moment estimation method of calibrating the model parameters. In practical application, the reliability model can be used to judge traffic operating posture for expressway management department, and also can be used to forecast travel time information, to provide valuable reference on decision-making for drivers travel plan or route choice.

Abstract: The accident is occurred more easily in the tunnel section and the accident in the tunnel is difficult to deal with. In order to reduce the accidents in the highway tunnel, ensure the normal running of the mechanical and electrical system is very significant. Completing mechanical and electrical maintenance and strengthening the construction of tunnel electromechanical is one of the important way to reduce accidents. This paper first introduces the components of tunnel electromechanical system, then introduces the development situation and maintenance of tunnel electromechanical system, finally the daily maintenance and management is presented.

Abstract: The highway toll collection system is a fusion of science and technology and a large number of advanced science and technology research was adopted. There is much common fault in the daily work of the toll collection system, which will affect the work efficiency of the toll collector in the station. In order to keep the toll collection system stable operation, the common fault of the toll collection system has been analyzed in this paper. Finally the effective ways of troubleshooting were proposed.

Abstract: An integration algorithm for clustering is presented, in which a maximization & minimum algorithm to determine the initial centers and BWP (Between-Within Proportion) index for input of optimal k. In theory, the bigger the BWP index, the better the clustering effectiveness. Then a numerical example of air transport market segment is presented to show the effectiveness and efficiency of the method presented in the document.

Abstract: Gravel roads are majorly affected by deterioration which manifests as loss of gravel materials due to traffic and environmental conditions. District Road Maintenance Managers are faced with competing investment demands to maintain gravel road networks in the best condition due to inadequate intelligent techniques of evaluating the roadway performance. The aim of evaluating the road network performance is to reduce the rate of deterioration so that maintenance interventions could be extended. Road condition data is a precursor for road monitoring and is collected on a periodic basis by road authorities to assist in transportation planning. The primary objective of this paper was to evaluate and analysis the trend of Botswana gravel road condition which best captures the effects of gravel road condition influencing factors. This was achieved by carrying out exploratory statistical analysis. Gravel road condition data were collected through the Botswana Roads Department covering 2002, 2005 and 2008 for Botswana district gravel road networks. The variables required for the analysis were clustered and pre-processed to determine their suitability. The analysis results gave a broad overview of the extent to which gravel road condition trends lend credence to their usefulness in district transportation networks monitoring in Botswana.

Abstract: With the impetus of the national strategy of the Rise of Central China, we should pay more attention to the sustainable development and make big efforts to stimulate domestic demand, of which Wuhan is one of the most promising areas in central region. Transportation is not only the production sector to create material wealth but also the foundation to support the social economic operation. It plays an important role in promoting the development of specialized production and social division of labor. This paper theoretically analysis the impact of transportation on the economic development in Wuhan and explores the intrinsic interaction mechanism of transportation and economic development in Wuhan. It researches the effect of the change of transportation conditions on economic development in Wuhan and concludes the general law.

Abstract: Taking Shiyang River Basin as study area, Considering that the road net building is influenced by the industry, structure of resources, the road building policy, the highway net construction policies and the other transport patterns, so a concept of highway dependence-preference index is put forward, which is used to explain the variation between the actually obtained highway net densities and the values obtained by model calculation. The results show that:The density of road network in Shiyang River Basin is outward decay along the center of Jinchang and Wuwei City. The distribution density of road network is zonal shape from the south of Tianzhu county extending to the Jinchuan District, Jinchang City. Social developments of the Shiyang River Basin depend on the road network strongly, with two Counties/Districts in the super dependence or super preference situation, 28 towns in strong dependence or strong preference situation, which accounting for 26.67% of all townships in Shiyang River Basin. The medium dependence or medium preference situation is about 44 towns, which accounting for 41.9% of all counties in Shiyang River Basin. 24 countries/districts are in the less dependent or weak preference, and 7 countries/districts are in the weak dependent or weak preference situation. Besides, the study also found that the counties city center also formed basically a small group of road network, the region and part of key towns may become a potential area of the density of road network development in the future.