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- 저자 : Zengqiang Duan (검색결과 2 건)
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Yunbiao Jiang,Zhongxin Liu,Zengqiang Chen,Feng Duan 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.4
In this paper, the coordinated tracking problem of high-order multiagent systems with preset error constraints is studied. Based on the barrier Lyapunov function method, two novel distributed error-constrained consensus controllers are proposed: time-invariant symmetric error-constrained controller and time-varying asymmetric error-constrained controller. The first controller can meet the requirement of a fixed preset error bound for the system, and the system errors converge with the exponential rate. Then, the second controller is designed based on an error-constrained function and error transformation, which can not only meet the time-varying error constraint but also guarantee the lower bound of the convergence rate of the consensus error. That is, the transient performance of the system is guaranteed. Then, the effectiveness of the two controllers is verified and compared by a simulation example. Furthermore, a full-order error-constrained controller is designed by combining the above two methods, and its effectiveness is verified by the coordinated depth tracking simulation of multiple underwater vehicles.
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Comparison of long-term behavior between prestressed concrete and corrugated steel web bridges
Yulin Zhan,Fang Liu,Zhongguo John Ma,Zhiqiang Zhang,Zengqiang Duan,Ruinian Song 국제구조공학회 2019 Steel and Composite Structures, An International J Vol.30 No.6
Prestressed concrete (PC) bridges using corrugated steel webbing have emerged as one of the most promising forms of steel-concrete composite bridge. However, their long-term behavior is not well understood, especially in the case of largespan bridges. In order to study the time-dependent performance, a large three-span PC bridge with corrugated steel webbing was compared to a similar conventional PC bridge to examine their respective time-dependent characteristics. In addition, a threedimensional finite element method with step-by-step time integration that takes into account cantilever construction procedures was used to predict long-term behaviors such as deflection, stress distribution and prestressing loss. These predictions were based upon four well-established empirical creep prediction models. PC bridges with a corrugated steel web were observed to have a better long-term performance relative to conventional PC bridges. In particular, it is noted that the pre-cambering for PC bridges with a corrugated steel web could be smaller than that of conventional PC bridges. The ratio of side-to-mid span has great influence on the long-term deformation of PC bridges with a corrugated steel web, and it is suggested that the design value should be between 0.4 and 0.6. However, the different creep prediction models still showed a weak homogeneity, thus, the further experimental research and the development of health monitoring systems are required to further progress our understanding of the long-term behavior of PC bridges with corrugated steel webbing.
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