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- 저자 : Kaixuan Xu (검색결과 5 건)
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Xian Jing,Kaixuan Wang,Jieqiong Lin,Peng Liu,Yudi Kan,Xu Zheng,Jie Sun,Yingchun Li 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.1
Slicing reference data and adaptive slicing algorithm are the key issues to find out appropriate layer thicknesses of three-dimensional (3D) microstructures with free-form surface in two photon polymerization (TPP). In the present work, an adaptive slicing method (ASM) was proposed to improve the fabricating efficiency of 3D microstructures with free-form surface in TPP microfabrication. In the proposed method, slicing reference data were obtained by intersecting a series of vertical planes with the triangular patch format along characteristic directions. Maximum acceptable chordal height played a role as judging criteria to obtain appropriate layer thicknesses. What's more, typical 3D microstructures with free-form surfaces were fabricated with uniform slicing method (USM) and the proposed ASM, respectively. The comparison results showed that the proposed method effectively improved fabricating efficiency, guaranteeing an acceptable surface quality at the same time. This work was expected to provide references for improving fabrication efficiency of complex 3D microstructures in TPP.
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Xiaoming Gao,Kaixuan Xu,Hongbing He,Shouda Liu,Xiangbo Zhao 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.111 No.-
Cu-d-Bi2O3 nanosheets with uniform thickness of approximately 2.7 nm and length about 200 nm forphotocatalytic nitrogen fixation and photocatalytic oxidation is achieved by simple hydrothermalmethod. The 2D ultrathin structure is benefit to the formation of the surface oxygen vacancies, meanwhilethe impurity defect is formed due to the substitutive Cu doping of d-Bi2O3. The as-prepared 5%Cu-d-Bi2O3 exhibits excellent NH4 + generation rate of 142.8 lmol h1 g1 without any sacrificial agentirradiated by visible light. The remarkable photocatalytic ability can be attributed to the ultrafast carrierstransfer from the interior to the surface because of 2D ultrathin structure feature, the separation ofelectrons-holes and molecular chemisorption due to the formation of surface oxygen vacancies andimpurity defect.
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Ming Yang,Weilong Zheng,Kaixuan Yang,Dianguo Xu 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
In servo system, elastic component in transmission can produce mechanical resonance. The existence of backlash will aggravate the damage of resonance. According to dead-zone model, two-mass elastic system with backlash is established. The conclusion that the existence of backlash decreases the elastic coefficient of shaft equivalently and its quantitative relation are researched. This paper proposes a torque disturbance observer to realize the suppression of mechanical resonance with limiting control for shaft torque amplitude. The observer can decrease ratio of inertia equivalently in the case of no identification of backlash value. It has a compensation result that system is changed to a rigid system with single moment of inertia. In addition, this compensation algorithm is independent with parameters and configuration of speed controller. Simulations and experiments demonstrate the effectiveness of this torque disturbance observer.
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Load-transferring mechanism and evaluation theory of bolt with single and double nut fasteners
Qiyu Li,Dachang Zhang,Hao Xu,Yibi Li,Weiqun Chen,Kaixuan Zhang 국제구조공학회 2023 Structural Engineering and Mechanics, An Int'l Jou Vol.86 No.2
The use of the ordinary double nut (i.e., ODN) composed of a master nut (i.e., M-nut) and a slave nut (i.e., S-nut) is a highly efficient method to prevent bolts loosening. A novel double nut (i.e., FODN) composed of a master nut (i.e., M-nut) and flat slave nut (i.e., FS-nut) is proposed to save raw materials. The bolt fastening tests with single nut, ODN and FODN are performed to investigate the preload and counterbalance forces. Corresponding finite element analysis (FEA) models are established and validated by comparing the preload with the experimental results. The load-bearing capacity, the extrusion effect, and the contact stress of each engaged thread for ODN and FODN are observed by FEA. The experimental and simulated results revealed that the bolt fastening with double-nut has different load-transferring mechanisms from single-nut. Nevertheless, for double-nut/bolt assemblies, the FS-nut can provide load transfer that is like that of the S-nut, and the FODN is a reasonable and reliable fastening method. Furthermore, based on the theory of Yamamoto, a formula considering the extrusion effect is proposed to calculate the preload distribution of the double-nut, which is applicable to varying thicknesses of slave-nuts in double-nut/bolt assemblies.
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Real-time online optimal control of current-fed dual active bridges based on machine learning
Han, Ming,Liu, Xiaosheng,Pu, Honghong,Zhao, Liang,Wang, Kaixuan,Xu, Dianguo The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.1
This paper proposes a real-time online optimal (RT-OPT) control method based on machine learning for a current-fed dual active bridge (CF-DAB). The basis of this control strategy is the linear quadratic optimal control, which designs the sliding surface and realizes power control based on sliding mode control (SMC). For the parameters of Q and R in the objective function of the linear quadratic regulator (LQR), a genetic algorithm is used to find the optimal value, and the optimal value is taken as the sample data. Through machine learning offline training, a neural network is obtained and run online to realize real-time online optimal control. The control method was verified by simulations in MATLAB/Simulink. The RT-OPT method achieves the expected functionality, and has better dynamic and steady-state performance than the PI controller.
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