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RISS 인기검색어
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- 저자 : Weipeng Gao (검색결과 4 건)
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Operating area analysis and design of WPT systems with MEPT control
Weipeng Gao,Yanfang Fan,Chengxuan Wang,Kangping Wang,Hongchang Li 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.4
Coupled resonant tanks are key parts of wireless power transfer (WPT) systems with magnetic resonant coupling. Researchers have proposed different resonant tank design methods to improve power transfer efficiency, increase power density, reduce magnetic flux leakage, or lower VA ratings. Practical WPT systems require a closed-loop control to cope with the variations of operation conditions, but only a few studies have considered the safe operating area (SOA) of systems under closed-loop control in resonant tanks designs. In this work, we analyze closed-loop voltage and current stress characteristics from the aspect of maximum efficiency point tracking control and derive the SOA with a given set of stress limits. Then, we propose a resonant parameter design method of allowing the system to safely operate with any specified range of coupling coefficient and output power. The current stress was minimized in the design to reduce the conductive loss. As for the verification, an experimental prototype was built according to the design method.
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Three‑dimensional geometric optimization of WPT coils for coupling coefficient maximization
Weipeng Gao,Hongchang Li,Yi Tang 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.5
High-power transfer capacity is a major design objective of wireless power transfer (WPT) systems. For magnetic couplingbased WPT systems, increasing the coupling coefficient of power transceiver coils is the key to improving the power transfer capacity under specified limits on resonant current and voltage stresses. An effective method to increase the coupling coefficient is to optimize the geometric distributions of the coil wire loops. The obstacle of the optimization is the high computational complexity caused by the high geometric degrees of freedom, especially for multiturn coils. This paper proposes a 3D optimization method to reduce the computational complexity and give the optimal wire loop distributions for the maximum coupling coefficient. Design examples show that the optimal wire loop distribution is nonuniform. The smallest loop-to-loop spacing occurs near the front outer circumferences of the coils. Compared with common spiral and helix coils, the optimization can achieve 20% increase in coupling coefficient. The increase in coupling coefficient and power transfer capacity is verified through experiments.
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Gao Ran,Guo Wenjun,Fan Tianfei,Pang Junling,Hou Yangfeng,Feng Xiaohang,Li Bolun,Ge Weipeng,Fan Tianhui,Zhang Tiantian,Lu Jiakai,Jing He,Jin Mu,Yan Chen,Wang Jing 생화학분자생물학회 2022 Experimental and molecular medicine Vol.54 No.-
Abdominal aortic aneurysm (AAA) is a permanent expansion of the abdominal aorta that has a high mortality but limited treatment options. Phosphodiesterase (PDE) 4 family members are cAMP-specific hydrolyzing enzymes and have four isoforms (PDE4A-PDE4D). Several pan-PDE4 inhibitors are used clinically. However, the regulation and function of PDE4 in AAA remain largely unknown. Herein, we showed that PDE4D expression is upregulated in human and angiotensin II-induced mouse AAA tissues using RT-PCR, western blotting, and immunohistochemical staining. Furthermore, smooth muscle cell (SMC)-specific Pde4d knockout mice showed significantly reduced vascular destabilization and AAA development in an experimental AAA model. The PDE4 inhibitor rolipram also suppressed vascular pathogenesis and AAA formation in mice. In addition, PDE4D deficiency inhibited caspase 3 cleavage and SMC apoptosis in vivo and in vitro, as shown by bulk RNA-seq, western blotting, flow cytometry and TUNEL staining. Mechanistic studies revealed that PDE4D promotes apoptosis by suppressing the activation of cAMP-activated protein kinase A (PKA) instead of the exchange protein directly activated by cAMP (Epac). Additionally, the phosphorylation of BCL2-antagonist of cell death (Bad) was reversed by PDE4D siRNA in vitro, which indicates that PDE4D regulates SMC apoptosis via the cAMP-PKA-pBad axis. Overall, these findings indicate that PDE4D upregulation in SMCs plays a causative role in AAA development and suggest that pharmacological inhibition of PDE4 may represent a potential therapeutic strategy.
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Yanmei Gao,Liang Fan,Weipeng Yang,Lu Shi,Dan Zhou,Ming Wang 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.45 No.3
The mechanical behaviors of the prefabricated steel-concrete composite beams are usually affected by the strength and the number of shear studs. Furthermore, the discrete degree of the arrangement for shear stud clusters, being defined as the clustering degree of shear stud λ in this paper, is an important factor for the mechanical properties of composite beams, even if the shear connection degree is unchanged. This paper uses an experimental and calculation method to investigate the influence of λ on the mechanical behavior of the composite beam. Five specimens (with different λ but having the same shear connection degree) of prefabricated composite beams are designed to study the ultimate supporting capacity, deformation, slip and shearing stiffness of composite beams. Experimental results are compared with the conventional slip calculation method (based on the influence of λ) of prefabricated composite beams. The results showed that the stiffness in the elastoplastic stage is reduced when λ is greater than 0.333, while the supporting capacity of beams has little affected by the change in λ. The slip distribution along the beam length tends to be zig-zagged due to the clustering of studs, and the slip difference increases with the increase of λ.
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