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RISS 인기검색어
- 검색키워드
- 저자 : Yongjian Zhou (검색결과 6 건)
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Optimization of multiple tuned mass dampers for large-span roof structures subjected to wind loads
Zhou, Xuanyi,Lin, Yongjian,Gu, Ming Techno-Press 2015 Wind and Structures, An International Journal (WAS Vol.20 No.3
For controlling the vibration of specific building structure with large span, a practical method for the design of MTMD was developed according to the characteristics of structures subjected to wind loads. Based on the model of analyzing wind-induced response of large-span structure with MTMD, the optimization method of multiple tuned mass dampers for large-span roof structures subjected to wind loads was established, in which the applicable requirements for strength and fatigue life of TMD spring were considered. According to the method, the controlled modes and placements of TMDs in MTMD were determined through the quantitative analysis on modal contribution to the wind-induced dynamic response of structure. To explore the characteristics of MTMD, the parametric analysis on the effects of mass ratio, damping ratio, central tuning frequency ratio and frequency range of MTMD, was performed in the study. Then the parameters of MTMD were optimized through genetic algorithm and the optimized MTMD showed good dynamic characteristics. The robustness of the optimized MTMD was also investigated.
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Optimization of multiple tuned mass dampers for large-span roof structures subjected to wind loads
Xuanyi Zhou,Yongjian Lin,Ming Gu 한국풍공학회 2015 Wind and Structures, An International Journal (WAS Vol.20 No.3
For controlling the vibration of specific building structure with large span, a practical method forthe design of MTMD was developed according to the characteristics of structures subjected to wind loads. Based on the model of analyzing wind-induced response of large-span structure with MTMD, theoptimization method of multiple tuned mass dampers for large-span roof structures subjected to wind loadswas established, in which the applicable requirements for strength and fatigue life of TMD spring wereconsidered. According to the method, the controlled modes and placements of TMDs in MTMD weredetermined through the quantitative analysis on modal contribution to the wind-induced dynamic responseof structure. To explore the characteristics of MTMD, the parametric analysis on the effects of mass ratio,damping ratio, central tuning frequency ratio and frequency range of MTMD, was performed in the study. Then the parameters of MTMD were optimized through genetic algorithm and the optimized MTMDshowed good dynamic characteristics. The robustness of the optimized MTMD was also investigated.
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Cao Zhengqin,Gang Wei,Zhou Yongjian,Bai Yichun,Hu Ding-Wen 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.2
Aiming at the serious defects of wire-type free metal particles, which can cause severe partial discharge (PD) in Direct current (DC) gas-insulated equipment, the experiments on the infl uence of four lengths (3.0, 5.0, 7.0, and 9.0 mm) of wiretype free metal materials on SF 6 decomposition under DC PD were conducted. The formation rules of four characteristic decomposition components, namely, CF 4 , SOF 2 , SO 2 F 2 and SO 2 , under diff erent lengths of wire-type free metal particles, were determined using gas chromatography. Results showed that the amounts of four kinds of SF 6 DC PD characteristic decomposition components are proportional to the length of wire-type free metal particles. The long length of wire-type free metal particles increases the intensity of PD and the amount and eff ective generation rates of SF 6 DC PD characteristic decomposition components. All these fi ndings provide an experimental basis for the diagnosis of insulation defect types in SF 6 DC gas insulated equipment.
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Workload Characterization on a Cloud Platform: An Early Experience
Zujie Ren,Jinxiang Dong,Yongjian Ren,Renjie Zhou,Xindong You 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.6
Understanding the characteristics of cloud workloads is the key to making optimal configuration decisions and improving the system throughput. However workload characterization of cloud, especially in a large-scale production environment, has not been well studied yet. To gain insights on cloud workloads, we collected a one-week workload trace from a 100-node cloud cluster which hosts 1082 virtual machines. We characterized the workload at the granularity of virtual machines and physical nodes, respectively. We concluded with a set of meaningful observations. The results of workload characterization are representative and generally consistent with cloud cluster for public IaaS service providers, which can help other researchers and engineers understand the performance and VM characteristics of the cloud in their production environments.
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Hao Cui,Xiaoxing Zhang,Yongjian Zhou,Jun Zhang 한국탄소학회 2018 Carbon Letters Vol.26 No.-
Comprehensive calculations of the Rh decoration effect on zigzag CNTs with n ranging from 7 to 12 were conducted in this work to understand the effect of Rh doping on geometric structures and electronic behaviors upon metallic and semiconducting CNTs. The obtained results indicated that Rh dopant not only contributes to the deformation of C-C bonds on the sidewall of CNTs, but also transforms the electron distribution of related complexes, thereby leading to a remarkable increase of the conductivity of pure CNTs given the emerged novel state within the energy gap for metallic CNTs and the narrowed energy gap for semiconducting CNTs. Our calculations will be meaningful for exploiting novel CNT-based materials with better sensitivity to electrons and higher electrical conductivity compared with pure CNTs.
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Lin Huang,Tingwen Guo,Yongjian Zhou,Dong Han,Yu Gu,Cheng Song,Feng Pan 한국자기학회 2022 Journal of Magnetics Vol.27 No.4
The casting process of Fe-Ni Invar alloy could drastically affect magnetic properties and thermal expansion. We have observed analogous trends of saturation magnetization and thermal expansion coefficient in two distinct types of casted samples, as we perform post-annealing at different temperatures. X-ray diffraction measurements show that all the alloys remain in the same face-centered cubic structure after different heat treatments without phase transformation. With the help of X-ray diffraction and differential thermal analysis, we have inferred that these changes in properties might be induced by magnetic lattice transitions and analyzed the possible reason for property differences in samples. This work delivers a perspective on the relationships between thermal expansion, magnetic properties, and heat treatments, which could help to improve the industrial assembly line design.
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