Advanced Materials Research Vols. 779-780

Abstract: The conceptual introduction of the service network and its function in passenger flow assignment are given. Based on the summary of the related research results, the service networks are divided into two classes as the matrix type and the network type according to the different construction methods. The modeling principles and methods of the network type service network are then proposed. The methods are explained in three aspects including node modeling, segment (or arc) modeling, and partial network modeling, which can, for a certain physical network and a certain line plan, construct the virtual service network that is required by the passenger flow assignment process. Corresponding modifications are required when using these methods in specific researches.

Abstract: In this paper, a comprehensive theoretical analysis of servo valve torque motor that includes the ignored magnetic reluctance of magnetic elements is carried out. These analyses are based on fundamental laws of electromagnetism and general mechanics, thus a new mathematical model of servo valve torque motor is derived to improve the accuracy of the model. When using this model structure to fit the simulation data of electromagnetic torque constant and magnetic spring stiffness, the result render closer agreement with than when using existing models.

Abstract: This paper introduced the vary application filtration treatment systems, different grades of water and several media materials that could be applied in infiltration treatment systems, along with characteristic of these media materials. The characterization and analyses of the media and their effects on the removal of specific contaminants, and factors affecting the fate and behavior of various contaminants in filtration systems were discussed. Case studies of the appropriate application of infiltration treatment systems were also included.

Abstract: The traffic characteristics of passenger cars with more than 7 seats are directly related to the operation status of megacitys freeway network. With applying 3-months ETC data, this paper aims to propose methods for traffic characteristics analysis of passenger cars with more than 7 seats. Moreover, based on the macroscopic indexes calculation such as travels per day, penetration of local vehicles, average speed and average driving distance, the traffic characteristics of these vehicles are analyzed respectively in holidays, weekends and working days.

Abstract: According to advantages of airfield runway on highway, at first the building effect and significance are analyzed, and then the utilization characteristic of asphalt pavement of airfield runway on highway is discussed through the aspects of transit load type, wheel imprint transversal distribution, traffic volume and service requirement, etc, in combination with practical situation of prevailing of asphalt pavement in China. In order to provide reference to management and maintenance of asphalt pavement of highway-runway, and satisfy the service requirement of vehicle and airplane, related discussion issues are proposed, such as pavement evaluation index system, performance comprehensive evaluation, residual service life prediction, evaluation system software, external quality evaluation method, etc.

Abstract: In order to resolve the outstanding problem of China on how to scientifically manage and maintain airfield runway on highway, and according to realistic situation of prevailing of asphalt pavement, as well as transit characteristics of automobile and airplane on airfield runway on highway, the performance of asphalt pavement is analyzed via the aspects of bearing capability, high temperature stability, low temperature anti-cracking property, durability, smoothness, anti-sliding performance, drainability, etc, to qualitatively propose the requirements; in order to provide reference for utilization and management, to effectively and properly evaluate the asphalt pavement, the evaluation system is proposed, and its main index includes pavement bearing strength, appearance quality, friction coefficient, and evenness, etc.

Abstract: Feeder airport constructions and managements are analyzed in the perspective of airport positioning, management system and resources allocation to provide the decision making and consulting reference for the feeder airport construction, by applying the theoretical achievement of Traffic Demand Management (TDM) in the field of urban transportation planning, absorbing the theory and thoughts, technical methods, policy measures and organization performance.

Abstract: To study directional pressure relief blasting, cement mortar model tests are carried out. Protecting borehole wall, free-face wall and bottom wall are tested of the dynamic strain. Three-dimensional numerical simulation and numerical calculation of the tests are conducted by using LS-DYNA3D. The pressure values and test results of the protecting borehole wall, free-face wall and bottom wall with the same distance from the explosives are compared. Development and distribution of pressure regularity are analyzed; blast hole pressure relief effect of protecting borehole wall materials and bottom interval air column are explicated. The present results indicate that there is an obvious stress concentration phenomenon on the free-face wall, with an average pressure decrease rate of 26% from the free-face wall to the protecting borehole wall with the same distance to the explosive center, while the isolation materialPVCU plays a good directional protection. The pressure effect of the blast hole bottom air column on the blast hole is apparent. The simulation results are consistent with the experimental dates.

Abstract: A lumped parameter model is developed to study thermal management system performance of underwater vehicle equipping large power proton exchange membrane fuel cell propulsion unit. Fuel cell voltage current characteristic and heat release characteristic are represented by models which take effect of cooling water temperature into considered. Fuel cell stack performance models are validated against experimental data. Cooperated with experimental based models of water pump and heat exchanger, thermal management system performance is analyzed while fuel cell stack fresh cooling water outlet temperature is set to be at a certain value. The results show that inlet seawater temperature variation has little effect on opening of regulating valve, but engine power output variation results in notably regulating valve opening fluctuation. Modeling results would be employed in design of a underwater vehicle 300kW fuel cell engine system..

Abstract: The Xinshengwei base of Nanjing port is located in the water area of the Yangtse River. To meet the development of the port, the owners decide to rebuild and level up the Xinshengwei base to increase the transit quantity of integrated barges. A research on the working conditions after the base is rebuilt and promoted is of great necessity. By analyzing the working conditions the base required, the main effect factors, the working properties of the berthing capability and the anchor-chain system in detail systematically, an integrated numerical method for berthing capability is proposed. Computing impact force when berthing in work-energy theory overcomes the defect of the method based on experience. The upper limit controlled condition is raised through the research. The research results fit the in-situ mooring test well.