Time filter

Source Type

Yantai, China

Wang Z.,Graduate Students Brigade of NAEI | Cao Y.,NAEI | Wang M.,Graduate Students Brigade of NAEI | Chen X.,Unit 75103
Gaoya Dianqi/High Voltage Apparatus

According to the working principle of synchronous induction coil launcher, mathematical model of three-stage electromagnetic coil vertical launcher (EMCVL) is established. With the application of Ansoft, the dynamic simulation of its process is made. The electromagnetic field and the dynamic characteristic curves are given. The simulation results indicate that the launching package of heavy load is speeded smoothly in low speed, and the drive coil can make the best of its capability of driving the package. The electromagnetic field is focused between the drive coil and the armature' outside surface, and then spreads all around. The electromagnetic force is focused on the outside of the tail of armature, the fortification of the tail of armature should be considered. It is capable of EMCVL of launching multi-types of loads by changing energies in energy storage systems or the number of stages of the launching coils suitably. Source

Zhang J.,Yantai University | Gu W.,NAEI | Liu Z.,Yantai University | Chen R.,Yantai University
2012 International Conference on Systems and Informatics, ICSAI 2012

Cross-beam experiment system(CBES) [1] as a high degree nonlinear, strong coupled MIMO control system has very high application value in the engineering and military affairs. Based on the rule of constructing the global identical terminal function [2], a kind of speedy terminal function [4] is validated as the global identical terminal function and the basic theory of the global identical terminal sliding mode control is expatiated; then exponential reaching law [3] is adopted to design the controller and a variable domain fuzzy controller [7,8] is adopted to approximate parameter of reaching law. The approach can not only weaken chattering, improve speed of error convergence and precision of the controller, but also assure robustness of the system. Simulation result shows the effectiveness of the approach presented. © 2012 IEEE. Source

News Article
Site: http://www.scientificamerican.com

An “all-electric” future for city transportation fleets could significantly reduce – but not eliminate urban air pollution. With dropping battery prices and pressure to reduce air pollution in cities, increasing attention is being paid to the potential for electricity to power urban transportation fleets. Electric vehicles could eliminate local sources of air pollution including nitrogen oxides (NO ) and sulfur oxides (SOx). But, when taking a closer look at the data, it becomes clear that EVs would not eliminate the majority of local particulate matter emissions. In the “Fleet Weighted Road Transport Emission Factor 2012” database, emissions factors for transport technologies (for example, cars, buses, and trains) are published in units of grams per kilometer driven. A sample of these data – which is published by the United Kingdom’s National Atmospheric Emissions Inventory (NAEI) - is found in the chart below. According to these data, 55-95% of particulate matter air pollution (PM ) from cars driving in urban areas isn’t actually from the tailpipe. Instead, it is produced when cars are driven, via brake wear, tire wear, and road abrasion. Furthermore, diesel cars produce 74% more PM that gasoline vehicles per kilometer driven under the same driving conditions. That being said, while EVs are not truly “zero emission” vehicles, they could certainly help to reduce urban air pollution. According to a study published this summer by King’s College London, particulate matter is responsible for an estimated 3,537 premature deaths each year in the city. This number has decreased since a 2008 estimate of 4,267 annual premature deaths, in part thanks to policy interventions. While these numbers might seem high, they are much lower than the annual premature deaths resulting from exposure to nitrogen dioxide (NO ), a type of NO pollution. According to the same report, an estimated 5,879 premature deaths occur each year due to long-term to this NO .  All told, these researchers estimate that the health impacts of these two pollutants cost the UK government between £1.4 billion and £3.7 billion ($2.1 - $5.6 billion) each year. While an “all-electric” future for city transportation fleets wouldn’t eliminate urban air pollution, it could certainly make a significant positive difference.

Qiu L.,NAEI | Ye W.,NAEI
Proceedings of the World Congress on Intelligent Control and Automation (WCICA)

Mission planning for multi-UCAV cooperation is one of the keys to take the advantages of multiple UCAVs combating cooperatively and to maintain harmonies between the mission complexities and UCAV abilities. A distributed and concentrated composite architecture of multi-UCAV cooperation mission planning system was constructed. Based on the analysis of the cooperative UCAVs mission hierarchy, a hierarchical and iterative mission planning frame was introduced. The logic architecture of multi-UCAV cooperation mission planning system was put forward, and two key sub-problems, that is mission assignment and path planning, were analyzed. © 2012 IEEE. Source

Zhang Z.,NAEI | Qu X.,NAEI | Ma D.,NAEI | Zhu D.,PLA Xuzhou Air force College | Wang L.,NAEI
2012 International Conference on Systems and Informatics, ICSAI 2012

This paper describes the characteristics of anti-radiation missile/radar target end game, and points out the disadvantages of ARM only with contact burst model. An adaptive burst strategy is put forward to estimate proximity fuze detonation delay-time, so as to improve the destruction probability. A Monte-Carlo simulation study is discussed. © 2012 IEEE. Source

Discover hidden collaborations