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Xie Xiangdong,Zhang Jinfeng,Wang Zijing,Hu Xiaobin 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.1
In order to quantitatively evaluate the contribution from each optimization factor of cantilevered harvesters in the improvement of their energy harvesting performance, sets of test specimens are designed and customized. The eff ect of taper ratio, substrate thickness, proof mass, excitation frequency, load resistance and the number of bonded piezoelectric patches on the output electric parameters from the harvesters are tested and evaluated. The experimental results show that the improvements of the output voltage/voltage density, the output power/power density from the harvesters depend on the factors in the contribution turn from big to small as: the increase of the proof mass value, the decrease of the substrate thickness, and the increase of the taper ratio. For a cantilevered harvester ( l 2 = 50.5 mm, b = 15 mm, h 2 = 1 mm, λ = 4/5), its output power and power density can improve 5092.6% by adding a proof mass of 4.31 g. This research obtains some important and instructive conclusions for the practical design of the cantilevered harvester with ideal energy harvesting effi ciency and cost-eff ectiveness.
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Xiaobin Hu,Chen Lu,Xiaoqing Zhu,Xiangdong Xie 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.12
The framed self-centering wall (FSCW) structure is a newly-emerged special type of seismic-resistant system. However, the related studies rarely concern the theoretical investigation of the FSCW structures subjected to lateral loading, which is of great importance for seismic design of the FSCW structures. In view of this, the analytical model of the FSCW structures is firstly developed, then the fundamental equations that govern the elastic responses of FSCW structures under lateral loads are formulated and the corresponding analytical solutions are derived. Meanwhile, the developed analytical model is validated by the finite element method, which shows that the developed model has a good reliability in predicting the elastic responses of FSCW structures sustaining lateral loading. Utilizing the proposed method, the effects of the post-tensioned (PT) tendon and dampers on the behaviors of the FSCW structure under lateral loading are investigated. Moreover, a comparative study of mechanical performance between the FSCW structure and conventional structures under lateral loading is conducted. The results show that, in terms of the lateral displacement and shear force responses of the frame, the mechanical performance of the FSCW structure subjected to lateral loading generally falls in between those of the conventional frame-shear wall structure and the moment-resisting frame structure.
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