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RISS 인기검색어
- 검색키워드
- 저자 : Yunzhou Chen (검색결과 3 건)
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Development Issues of An ISG PM Machine and Control System
Xiaojiang Chen,Murray Edington,Roger Thornton,Yunzhou Fang,Qingfeng Peng 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
This paper focuses on addressing some practical considerations in developing an ISG PM system for hybrid electric-vehicle (HEV) applications. Extensive practical test results and theoretical analyses are presented and analyzed. Firstly, the ISG PM machine design is discussed in term of the machine size, pole-pair number, permanent magnet flux, inductance, etc. A cost-effective machine design example, which was successfully demonstrated in a mild ISG HEV application, is analyzed. Its performance test results are evaluated. Subsequently, the impacts of the position sensors on the ISG performance are investigated exclusively. Three prominent position sensor candidates are studied in detail to examine their limitation and feasibility for ISG applications. Furthermore, the control related issues are discussed. The torque control of the ISG machine is implemented through vector control algorithm. Flux-weakening control is employed to achieve a wide speed range of constant-power operation. The impact of the inverter DC-link voltage variation is explored. In addition the digital control delay influence and its effective compensation strategy are addressed.
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Dong Li,Yunzhou Chen,Jialin Jia,Haiyang He,Wei Shi,Jianghua Yu,Jun Ma 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.109 No.-
Effects of hydrothermal parameters on morphology, crystal structure, light absorption, separation efficiencyof photo-generated charge carriers, and photocatalytic removal of Bisphenol A (BPA) of Ti-basedTiO2 nanomaterials were systematically investigated. Through changing hydrothermal parameters,TiO2 nanobelts, TiO2 nanosheets and TiO2 nanowires were prepared. With increasing NaOH concentration,hydrothermal temperature, and hydrothermal time, more TiO2 with (101) crystal plane grew onTi substrate, resulting in higher crystallinity. The UV-light absorption enhanced with increasing NaOHconcentration, but decreased with improving hydrothermal temperature, hydrothermal time, and HClconcentration. Variation of UV-light absorption was mainly affected by morphology, and UV-light absorptionof TiO2 nanomaterials with different morphologies was arranged in order ofnanobelts > nanosheets > nanowires. The hydrothermal growth of TiO2 nanomaterials on Ti plate conformedto Ostwald ripening mechanism. Variation trend of photo-generated current was consistent withthat of BPA degradation, they both first increased and then decreased within investigated range. The optimalNaOH concentration, hydrothermal temperature, hydrothermal time, and HCl washing concentrationwere 1 M, 170℃, 28 h, and 0.1 M, respectively. Under this condition, Ti-based TiO2 nanosheets exhibitedthe highest BPA removal efficiency (92.7%), which was due to highly ordered nanosheet structure, goodcrystallinity, appropriate UV-light absorption and high separation efficiency of electron-hole pairs.
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Yun Zhou,Chen Gong,Gen-Quan Zhong,Shi-yu Tian,Ming-Xiang Xiong 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.2
Out-of-plane stability of buckling restrained braces (BRBs) has been a critical concern for structural design of them under seismic loads. Although some calculation methods are available in literature catering for the determination of stability resistance of the BRBs, they showed complexities on dealing with numbers of parameters. In this paper, the mechanism of out-of-plane buckling failure of the BRBs was fi rstly introduced; then, an analytically and numerically hybrid method was proposed to calculate the out-of-plane stability resistance of the BRBs with considerations given to solve some key parameters; fi nally, the proposed hybrid method was verifi ed by test results of 4 BRB sub-frames subjected to the lateral loads. The results indicated that the out-of-plane bending deformation of BRB and gusset plate would occur under seismic loads. With an increasing rotation between the end of BRB and the inner core, the out-of-plane buckling failure happened owing to the existence of a plastic hinge at the bottom section of the outstanding part outside the inner core of the BRB. The outof- plane bending stiff ness of BRB and gusset plate, initial imperfection and bending moment capacity of the outstanding part are the key parameters aff ecting the out-of-plane stability of the BRBs. The proposed hybrid method is reasonable and eff ective to calculate the out-of-plane buckling capacity of the BRBs subject to diff erent combinations of axial force and end bending moments.
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