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Yi L.,University of South China | Yi L.,Key Laboratory of Operation Safety Technology on Transport Vehicles | Chen J.,University of South China
Advanced Materials Research | Year: 2012

The aim of this work is to study the burning characteristics of coach fire. With application of computational fluid dynamics (FDS software package), coach fires caused by arson are simulated under different ventilation conditions. Variation of heat release rate (HRR) and distribution of temperature are analyzed. Peak heat release rate of coach fire caused by arson in passenger carriage can reach about 24 MW and maximum temperature in the carriage is over 1000 °C. Results of this study can be referred for fire protection and rescue design of coach. © (2012) Trans Tech Publications, Switzerland. Source


Yi L.,Hunan Institute of Technology | Yi L.,Key Laboratory of Operation Safety Technology on Transport Vehicles | Gao Y.,Hunan Institute of Technology | Niu J.L.,Hunan Institute of Technology | Yang S.J.,Hunan Institute of Technology
Journal of Wind Engineering and Industrial Aerodynamics | Year: 2013

Effect of wind on natural smoke exhaust in enclosure fire with a two-layer zone model was studied in this paper. A "net wind pressure coefficient" was proposed to evaluate the significance of wind effect. Case calculations on quasi-steady vented stage of natural smoke exhaust were performed. It is shown that with a negative net wind pressure coefficient, performance of exhaust will be degraded by the wind, even invalidated. The critical wind speed invalidating natural smoke exhaust is found inversely proportional to the absolute value of the net wind pressure coefficient. Experimental data in a model room is presented and compared with the predicted values using the two-layer zone model. Good agreements were found between the predicted and experimental results except in the cases with a non-positive net wind pressure coefficient. Discrepancies are ascribed to the disturbance of the vent flow and stratification in the room by the wind. While activating natural smoke exhaust system in case of fire under the windy condition, positions of the smoke vent and air inlet should be located with consideration according to the wind direction to form a big positive net wind pressure coefficient as possible and to increase the exhaust efficiency. © 2013 Elsevier Ltd. Source


Zhu C.,Beihang University | Zhu C.,Key Laboratory of Operation Safety Technology on Transport Vehicles | Li X.,Beihang University
Qiche Gongcheng/Automotive Engineering | Year: 2013

To estimate the pulse power capability of high power lithium ion battery, an electrochemical model for lithium ion battery is developed firstly based on porous electrode and concentrated solution theory. With the model, the change in battery terminal voltage can be predicted according to the charge/discharge current and operation temperature of battery, and hence the maximum pulse discharge/charge power permitted by lithium ion battery pack at present state can be estimated. Then, for verifying the effectiveness of the model, the dynamic response process of terminal voltage in a 3.6V/8A·h lithium ion battery during 10s pulse charge/discharge with various current rates, and the acceptable 10s maximum pulse discharge/charge power of 144V/8A·h lithium ion battery pack under different SOCs and temperatures are measured on Arbin test bench. The results of tests show that when the pulse charge/discharge time exceeds 1s, the relative errors of the predicted terminal voltages are less than ±1% and the relative errors of the estimated maximum discharge/charge power of battery pack are less than ±3%. Finally, the effects of negative electrode porosity on the pulse power capability of battery pack are analyzed with the electrochemical model. Source


Liu Y.,Key Laboratory of Operation Safety Technology on Transport Vehicles | Yao Y.,Key Laboratory of Operation Safety Technology on Transport Vehicles | Zhang X.,Key Laboratory of Operation Safety Technology on Transport Vehicles | Liu B.,Key Laboratory of Operation Safety Technology on Transport Vehicles | Ding C.,Beijing Jiaotong University
Proceedings of 2015 International Conference on Estimation, Detection and Information Fusion, ICEDIF 2015 | Year: 2015

According to some reasons, such as multifarious, low efficiency status of scientific research management work by artificial way, furthermore, big workload and poor adaptability of requirement change exists in traditional software development method. In this paper, a typical model of scientific research project management process was build based on workflow technology. The business logic and specific function of project management were designed separately, so a unified and orderly management of scientific research project was realized, and flexibility and system adaptability were enhanced too. Rapid development platform technology was chosen in the business system development. This technology affords a develop mode of parameter customization and it could manage intelligence report, data maintenance, Model View Controller (MVC) service control and other parameters. Compared to the traditional programming development mode, a complex and high quality business system can be developed conveniently and fast. © 2015 IEEE. Source


Zhang H.,Chinese Research Institute of Highway | Zhang H.,Key Laboratory of Operation Safety Technology on Transport Vehicles | Zhang H.-W.,Chinese Research Institute of Highway | Zhang H.-W.,Key Laboratory of Operation Safety Technology on Transport Vehicles | Yang J.-Q.,Beihang University
Procedia Engineering | Year: 2016

Three different type of double road trains are selected as simulation model, which is commonly used in developed countries and regions in order to improve the efficiency of road transport and the development of China's logistics industry. The passing ability simulation model of double road train is established based on Auto Turn, and China's current longest tractor-semitrailer is used as a comparison. Simulation models of highway ramp, first class highway and second class highway are established according to the requirement of JTG D20-2006 'Design Specification for Highway Alignment'. Adaptability of double road train and highway structure parameter is researched by analyzing different types of double road train turn left, turn right and turn around on the road. The type of double road train which can meet China's standards is recommended. The result can promote the application of double road train and give some advice for improving passing ability. © 2016 The Authors. Published by Elsevier Ltd. Source

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