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VEHICLE-LEVEL ELECTROMAGNETIC COMPATIBILITY PREDICTION BASED ON MULTI-PORT NETWORK THEORY
Feng Gao,Hanzhe Dai,Jiawei Qi,Zilong Wang 한국자동차공학회 2019 International journal of automotive technology Vol.20 No.6
This paper proposes a new methodology based on the multi-port network theory to predict the vehicle-level electromagnetic compatibility performance. The original EMC problem is firstly converted to a network by separating the electrical large structures and electrical small components. The impedance is proposed to describe the coupling process of network to eliminate the influence of port impedance on network. Based on this network model, the relationship between the exciting sources and the sensitive components is set up using the multi-port network theory. Furthermore, some application problems, such as measurement of parameters, are also discussed. After validated by a bench test, this methodology for vehicle level electromagnetic compatibility was further applied to predict and improve the low frequency radiated emission of an electric vehicle. The application results show that it can be used to predict electromagnetic interference and analyze the main exciting source satisfactorily.
Experimental study on bearing capacity of PFCC column-RC beam joint reinforced with CST
Ping Wu,Dongang Li,Feng Yu,Yuan Fang,Guosheng Xiang,Zilong Li 국제구조공학회 2023 Steel and Composite Structures, An International J Vol.47 No.1
An experimental study of eleven PVC-FRP Confined Concrete (PFCC) column-Reinforced Concrete (RC) beam joints reinforced with Core Steel Tube (CST) under axial compression is carried out. All specimens are designed in accordance with the principle of “weak column and strong joint”. The influences of FRP strips spacing, length and steel ratio of CST, height and stirrup ratio of joint on mechanical behavior are investigated. As the design anticipated, all specimens are destroyed by column failure. The failure mode of PFCC column-RC beam joint reinforced with CST is the yielding of longitudinal steel bars, CST and stirrups of column as well as the fracture of FRP strips and PVC tube. The ultimate bearing capacity decreases as FRP strips spacing or joint height increases. The effects of other three studied parameters on ultimate bearing capacity are not obvious. The strain development rules of longitudinal steel bars, PVC tube, FRP strips, column stirrups and CST are revealed. The effects of various studied parameters on stiffness are also examined. Additionally, an influence coefficient of joint height is introduced based on the regression analysis of test data, a theoretical formula for predicting bearing capacity is proposed and it agrees well with test data.
Lite Zhang,Mengyu Su,Zilong Feng,Hao Guan,Haozhe Jin,Hong-Hui Shi 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.6
In this study, a comparison of five commonly used turbulence models was conducted in predictions of supersonic flows in a two-dimensional shock vector control nozzle. The result indicated that shear stress transport k-ω turbulence model performed best, and hence it was employed to carry out a parametric study on the shock wave vector control performance. The effects of slot interval distance, slot width, and injection angle on the deflection angle, thrust coefficient, and thrust efficiency were analyzed. All these performance parameters of a dual injection port nozzle can be better than those of a single injection port nozzle as long as the slot interval distance and width are appropriately selected. Under some investigated conditions, there exist an optimal slot interval distance and slot width both for the deflection angle and thrust efficiency, respectively.