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- 저자 : Xie Mengxue (검색결과 2 건)
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Design and Application of Flywheel–Lithium Battery Composite Energy System for Electric Vehicles
Sun Binbin,Xie Mengxue,Li Bo,Wang Pengwei,Gao Song 한국자동차공학회 2024 International journal of automotive technology Vol.25 No.1
For diff erent types of electric vehicles, improving the effi ciency of on-board energy utilization to extend the range of vehicle is essential. Aiming at the effi ciency reduction of lithium battery system caused by large current fl uctuations due to sudden load change of vehicle, this paper investigates a composite energy system of fl ywheel–lithium battery. First, according to the design requirements of vehicle performance, the essential parameters of the hybrid energy storage system are designed using CPE function. Then, based on the vehicle dynamics and operating principle of the hybrid energy system, a mathematical model for performance analysis of the hybrid energy electric vehicle is established. Finally, energy management strategy for the hybrid energy system is designed with the use of wavelet algorithm. Research results show signifi cant improvement of the storage system effi ciency. Specially, compared with the original scheme, owing to the fl ywheel battery, the maximum current and discharge rate of the lithium battery are reduced by 6.55% and 4.76% under WLTC working condition. Meanwhile, the average current is decreased by 14.93%. Furthermore, the average effi ciency of lithium battery is improved by 3.07%. The overall effi ciency of energy storage system is increased by 2.01%.
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Effects of Trapezoidal Fin Shape on Performance of Negative-capacitance FinFETs
Mengjie Zhao,Weifeng Lü,Ziqiang Xie,Mengxue Guo,Mi Lin 대한전자공학회 2022 Journal of semiconductor technology and science Vol.22 No.5
In this study, a negative-capacitance fin field effect transistor (NC-FinFET) with a varying trapezoidal fin shape is proposed. The effects of varying the width of the top fin on the performance of the trapezoidal NC-FinFET with different ferroelectric layer thicknesses are investigated in detail. Using the technology computer-aided design simulation, it was determined that the trapezoidal NC-FinFET has lower on- and off-state currents and a higher switching current ratio, as well as a higher threshold voltage, than a traditional rectangular NC-FinFET. Thus, the device demonstrates an improved subthreshold swing and drain-induced barrier lowering. Unlike a conventional trapezoidal FinFET, the variations in the parameter performance for an NC-FinFET exhibit non-uniform trends. This study provides a predictive estimation for trapezoidal fin-induced variations in an NC-FinFET at the early design stage.
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