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A Hybrid Double Self-lift Switched-Coupled Inductor Quasi-Z-Source Inverter
Huang Dong,Xue Pengfei,Chen Guang,Zhang Chaozhong,Zhao Chang,Huang Yuchen,Ding Xinping,Zhang Min 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.4
A hybrid double self-lift switch-coupled-inductor quasi-Z-source inverter (HDSCL-qZSI) is proposed in this paper. The voltage boost capability is higher and the voltage and current stress on components are lower than the existing quasi-Z-source topologies. Owing to the strong current handling ability and step-down coupled-inductor, the magnetic elements are smaller than that of mSSCL-qZSI and SCL-qZSI whose structure are similar to that of HDCSL-qZSI. The operation principles, comparisons of voltage and current stress on components and the size of magnetic elements are analyzed theoretically. Finally, the eff ectiveness of the proposed HDSCL-qZSI was validated by a 1 kW prototype fabricated in the laboratory.
Action path and mechanism of segment joints in the failure history of shield tunnel lining
Wei Jin,Xinping Dong,Biao Hu,Jinjin Zhang 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.7
Focusing on the failure history of single-ring segmental lining structure, the action path andmechanism of segment joint on the segment bending moment was investigated in this study. The explicit equations of segment bending moment increment difference and segmentbending moment diffusion coefficient were derived, and the causes of segment bendingmoment state variation in high load level were studied. In the failure history of segmentaltunnel lining, the bending moment variation was mainly controlled by the bending momentincrement difference per unit time (IND). IND was mainly controlled by the relative stiffnessratio of segment joints and their derivative. The action path of segment joints on segmentinternal force can be divided into: 1) the opening and yielding of segment joints, 2) theattenuation of rotational stiffness of segment joints, 3) the change of relative stiffness ratio andits derivative, 4) the IND value of non-zero, and 5) the drastic change of segment bendingmoment state. Furthermore, the rotation stiffness of the segment joint attenuated, and thenthe acceleration variation of segment bending moment was caused by segment joint effectsbecause IND was not equal to 0, i.e., the segment bending moment increased or decreasedsharply.