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| 1 | 新型非接触变压器的磁路模型及其优化显示文摘在非接触电能传输系统中,变压器的耦合系数直接关系到系统的变换效率。为提高非接触变压器的耦合系数,同时减小其体积、质量,给出改进的变压器磁芯结构及绕组排列方法,并结合电磁场仿真结果,提出新型非接触变压器的磁路模型。根据耦合程度不同,将总磁通分为无耦合、部分耦合和全耦合3部分。基于变压器磁路模型和该磁通分类方法,给出各部分磁阻和变压器耦合系数的量化计算方法,并进一步给出变压器优化设计方法,提出边沿扩展平面U型磁芯结构。采用优化后的变压器结构,设计了35~60V输入、60W输出的非接触变换器。变压器耦合系数的计算结果和测试结果一致,证明了所提磁路模型及耦合系数计算方法的正确性。与采用PlanarE64磁芯相比,在10mm气隙条件下,变压器耦合系数可从0.53提高到0.6,磁芯质量从122g减小到60g,最高变换效率提高了约2.5%。 | 张巍 陈乾宏 S.C.Wong Michael Tse 曹玲玲 | 2010 | 中国电机工程学报2010，30，27： | 31 |
| 2 | Solitary wave solution to Aw-Rascle viscous model of traffic flow显示文摘A traveling wave solution to the Aw-Rascle traffic flow model that includes the relaxation and diffusion terms is investigated. The model can be approximated by the well-known Kortweg-de Vries (KdV) equation. A numerical simulation is conducted by the first-order accurate Lax-Friedrichs scheme, which is known for its ability to capture the entropy solution to hyperbolic conservation laws. Periodic boundary conditions are applied to simulate a lengthy propagation, where the profile of the derived KdV solution is taken as the initial condition to observe the change of the profile. The simulation shows good agreement between the approximated KdV solution and the numerical solution. | 吴春秀 张鹏 S.C.WONG 乔殿梁 戴世强 | 2013 | Applied Mathematics and Mechanics(English Edition)2013，34，4： | 1 |
| 3 | Phase-plane analysis of conserved higher-order traffic flow model显示文摘The phase-plane analysis is used to study the traveling wave solution of a recently proposed higher-order traffic flow model under the Lagrange coordinate system.The analysis identifies the types and stabilities of the equilibrium solutions,and the overall distribution structure of the nearby solutions is drawn in the phase plane for the further analysis and comparison.The analytical and numerical results are in agreement,and may help to explain the simulated phenomena,such as the stop-and-go wave and oscillation near a bottleneck.The findings demonstrate the model ability to describe the complexity of congested traffic. | 吴春秀 宋涛 张鹏 S.C.WONG | 2012 | Applied Mathematics and Mechanics(English Edition)2012，33，12： | 0 |
| 4 | Order Exponential Evaluation Model for Road Traffic Safety in City Clusters显示文摘This study presents an order exponential model for estimating road traffic safety in city clusters.The proposed model introduces the traffic flow intrinsic properties and uses the characteristics and regular patterns of traffic development to identify road traffic safety levels in city clusters.Additionally,an evaluation index system of city cluster road traffic safety was constructed based on the spatial and temporal distribution.Then Order Exponential Evaluation Model(OEEM),a comprehensive model using order exponent function for road traffic safety evaluation,was put forward,which considers the main characteristics and the generation process of traffic accidents.The model effectively controlled the unsafe behavior of the traffic system.It could define the levels of city cluster road traffic safety and dynamically detect road safety risk.The proposed model was verified with statistical data from three Chinese city clusters by comparing the common model for road traffic safety with an ideal model.The results indicate that the order exponent approach undertaken in this study can be extended and applied to other research topics and fields. | Qizhou Hu S.C.Wong Y.C.Li Minjia Tan | 2021 | Journal of Harbin Institute of Technology(New Series)2021，28，1： | 0 |
| 5 | Conservation form of Helbing's fluid dynamic traffic flow model显示文摘A standard conservation form is derived in this paper.The hyperbolicity of Helbing's fluid dynamic traffic flow model is proved,which is essential to the general analytical and numerical study of this model.On the basis of this conservation form,a local discontinuous Galerkin scheme is designed to solve the resulting system efficiently.The evolution of an unstable equilibrium traffic state leading to a stable stop-and-go traveling wave is simulated.This simulation also verifies that the model is truly improved by the introduction of the modified diffusion coefficients,and thus helps to protect vehicles from collisions and avoide the appearance of the extremely large density. | 李书峰 张鹏 S.C.WONG | 2011 | Applied Mathematics and Mechanics(English Edition)2011，32，9： | 0 |
| 6 | Solitary wave solutions to higher-order traffic flow model with large diffusion显示文摘This paper uses the Taylor expansion to seek an approximate Kortewegde Vries equation(KdV) solution to a higher-order traffic flow model with sufficiently large diffusion. It demonstrates the validity of the approximate KdV solution considering all the related parameters to ensure the physical boundedness and the stability of the solution. Moreover, when the viscosity coefficient depends on the density and velocity of the flow, the wave speed of the KdV solution is naturally related to either the first or the second characteristic field. The finite element method is extended to solve the model and examine the stability and accuracy of the approximate KdV solution. | 菅肖霞 张鹏 S.C.WONG 乔殿梁 崔岐柱 | 2014 | Applied Mathematics and Mechanics(English Edition)2014，35，2： | 0 |
| 7 | A Bayesian modeling approach to bi-directional pedestrian flows in carnival events显示文摘Bi-directional pedestrian flows are common at crosswalks, footpaths, and shopping areas. However, the properties of pedestrian movement may vary in urban areas according to the type of walking facility. In recent years,crowd movements at carnival events have attracted the attention of researchers. In contrast to pedestrian behavior in other walking facilities, pedestrians whose attention is attracted by carnival displays or activities may slow down and even stop walking. The Lunar New Year Market is a traditional carnival event in Hong Kong held annually one week before the Lunar New Year. During the said event,crowd movements can be easily identified, particularly in Victoria Park, where the largest Lunar New Year Market in Hong Kong is hosted. In this study, we conducted a videobased observational survey to collect pedestrian flow and speed data at the Victoria Park Lunar New Year Market on the eve of the Lunar New Year. Using the collected data, an extant mathematical model was calibrated to capture the relationships between the relevant macroscopic quantities,thereby providing insight into pedestrian behavior at the carnival event. Bayesian inference was employed to calibrate the model by using prior data obtained from a previous controlled experiment. Results obtained enhance our understanding of crowd behavior under different conditions at carnival events, thus facilitating the improvement of the safety and efficiency of similar events in the future. | S.Q.XIE S.C.WONG William H.K.LAM | 2017 | Frontiers of Engineering Management2017，4，4： | 0 |
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