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Stable Sheet-Beam Transport in Periodic Nonsymmetric Quadrupole Field
Zhanliang Wang,Yubin Gong,Yanyu Wei,Zhaoyun Duan,Huarong Gong,Zhigang Lu,Lingna Yue,Hairong Yin,Jin Xu,Yuanbao Li,Pukun Liu,Gun-Sik Park IEEE 2010 IEEE transactions on plasma science Vol.38 No.1
<P>Stable sheet electron-beam transport is critical for sheet-beam microwave device which is attractive for high-power millimeter wave to terahertz-regime radiation. This paper studies the stable sheet-beam transport in periodic nonsymmetric quadrupole field. First, the conditions for stable round- and sheet-beam transport in periodic magnetic quadrupole field are deduced. In the deduction, we find that the symmetric quadrupole field and the space-charge field of sheet beam are not well matched. In order to settle this problem, we use periodic nonsymmetric quadrupole field instead of periodic symmetric quadrupole field to transport sheet beam. Finally, 3-D PIC simulations verify the conditions for stable sheet-beam transport and show that periodic nonsymmetric quadrupole field is intrinsically well suited for sheet-beam transport.</P>
Design of Single-Phase Electrical Spring Based on PR Controller and Critical Load Current Feedback
Wei Yi,Zhao ChaoHui,Duan YuBin 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.6
According to the characteristics of fast and accurate voltage regulation of single-phase electrical spring (ES), a critical load current feedback control strategy considering grid voltage is proposed. Taking pure resistive loads as an example, the S-domain mathematical model of ES is established. Based on this, the design method is described in detail. Aiming at the voltage fl uctuation of power grid aff ects the regulation precision of ES, the feedforward control of grid voltage is proposed. Through the equivalent transformation of control block diagrams, the feedforward transfer function of grid voltage which can eff ectively eliminate the infl uences of grid voltage on the regulation precision of ES is deduced. Finally, the eff ectiveness and correctness of the proposed control method is verifi ed by experiments
Wu, Wenfeng,Zhen, Changwen,Lu, Jinshu,Tu, Jiaoyang,Zhang, Jianwei,Yang, Yubin,Zhu, Kebi,Duan, Junxian The Society of Naval Architects of Korea 2020 International Journal of Naval Architecture and Oc Vol.12 No.1
A series of experiments covering lowest three natural frequencies of rolling coupled pitching were conducted to investigate liquid sloshing with low liquid depth. The test results show that the most violent liquid sloshing in rolling and pitching is located in the vicinity of the first order natural frequency (f1). When the excitation frequency of rolling and pitching is located between 0.98f1 and 1.113f1, roof-bursting phenomenon of liquid appeared, and the maximum impact pressure is at 1.09f1. When the external excitation frequency is at 1.113f1, the number of sloshing shocks decreases sharply. Furthermore, the space distribution of the impact pressure on the left bulkhead and the top bulkhead was analyzed. It is concluded that with low liquid filling, the impact load is greater near the free surface and the top of tank, and the impact position of the side bulkhead increases with the increasing of the frequency near the resonant frequency.