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RISS 인기검색어
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- 저자 : Donghua Zhou (검색결과 5 건)
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Active Fault-Tolerant Control for a Class of Nonlinear Systems with Sensor Faults
Youqing Wang,Donghua Zhou,S. Joe Qin,Hong Wang 대한전기학회 2008 International Journal of Control, Automation, and Vol.6 No.3
A general active fault-tolerant control framework is proposed for nonlinear systems with sensor faults. According to their identifiability, all sensor faults are divided into two classes: identifiable faults and non-identifiable faults. In the healthy case, the control objective is such that all outputs converge to their given set-points. A fault detection and isolation module is firstly built, which can produce an alarm when there is a fault in the system and also tell us which sensor has a fault. If the fault is identifiable, the control objective remains the same as in the healthy case; while if the fault is non-identifiable, the control objective degenerates to be such that only the healthy outputs converge to the set-points. A numerical example is given to illustrate the effectiveness and feasibility of the proposed method and encouraging results have been obtained.
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Study on axial compressive behavior of quadruple C-channel built-up cold-formed steel columns
Shaofeng Nie,Tianhua Zhou,Fangfang Liao,Donghua Yang 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.70 No.4
In this study, the axial compressive behavior of novel quadruple C-channel built-up cold-formed steel columns with different slenderness ratio was investigated, using the experimental and numerical analysis. The axial compressive capacity and failure modes of the columns were obtained and analyzed. The finite element models considering the geometry, material and contact nonlinearity were developed to simulate and analyze the structural behavior of the columns further. There was a great correlation between the numerical analyses and test results, which indicated that the finite element model was reasonable and accurate. Then influence of, slenderness ratio, flange width-to-thickness ratio and screw spacing on the mechanical behavior of the columns were studied, respectively. The tests and numerical results show that due to small slenderness ratio, the failure modes of the specimens are generally local buckling and distortional buckling. The axial compressive strength and stiffness of the quadruple C-channel built-up cold-formed steel columns decrease with the increase of maximum slenderness ratio. When the screw spacing is ranging from 150mm to 450mm, the axial compressive strength and stiffness of the quadruple C-channel built-up cold-formed steel columns change little. The axial compressive capacity of quadruple C-channel built-up cold-formed steel columns increases with the decrease of flange width-thickness ratio. A modified effective length factor is proposed to quantify the axial compressive capacity of the quadruple C-channel built-up cold-formed steel columns with U-shaped track in the ends.
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Zhong-Hua Pang,Guo-Ping Liu,Donghua Zhou,Dehui Sun 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.1
This paper is concerned with the design and performance analysis of networked control systems, whererandom network-induced delay, packet disorder, and packet dropout in the feedback and forward channels areconsidered simultaneously and further treated as the round-trip time (RTT) delay. To actively compensate forthe RTT delay, a networked predictive control scheme is designed based on the input-output difference equationmodel. For time-varying reference signals, the resulting closed-loop system can achieve the same output trackingperformance and closed-loop stability as the corresponding local control system. Specifically, for the step referenceinput, it can provide a zero steady-state output tracking error. The controller design problem is solved by usingthe augmented state-space model as well as the static output feedback strategy. In addition, the stability of theclosed-loop system is also discussed for the plant subject to bounded disturbances and modelling errors. Finally,simulation and experimental results are given to demonstrate the effectiveness of the proposed method.
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Behavior of Continuous Steel-concrete Composite Beams with Web Openings
Longqi Li,Wenyuan Liao,Jun Wang,Donghua Zhou 한국강구조학회 2015 International Journal of Steel Structures Vol.15 No.4
In order to investigate the mechanical performance and load carrying capacity of continuous steel-concrete composite beams with web openings, five continuous composite beams with web openings and a contrasting continuous composite beam without web openings were tested through two symmetric point loads. Nonlinear finite element analysis was also conducted, in which the slab thickness and the reinforcement ratio of slabs were selected as the major parameters. The main results of this test were concluded as follows: (1) Web openings not only decrease the stiffness and ultimate load carrying capacity of continuous composite beams but also give rise to the redistribution of vertical shear force between the cross section of the steel beam and the concrete slab at the web opening region. (2) The plane hypothesis is not satisfied at the web opening region. The failure mode of continuous composite beams with web openings is the shear failure of concrete slab in the region near the opening, and the result also indicates that the shear bearing capacity at the span with web openings become a critical factor in controlling design. (3) Meanwhile, by increasing the thickness and reinforcement ratio of a concrete slab, the ultimate load carrying capacity and ductility of continuous composite beams increased, which can be used to the enhancement of web opening region. (4) In addition, based on the experimental results, a finite element mode was established for composite beams with web openings, and good agreement was obtained between the tested results and the numerical results.
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Junxing Che,Yanzheng Zhu,Michael V. Basin,Donghua Zhou 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.6
In this paper, the active fault-tolerant control problem is studied for a class of discrete-time Markov jump linear parameter-varying systems. The partial information transmission between the fault diagnosis and isolation scheme and the controller reconfiguration mechanism is characterized by a time-varying hidden Markov model (HMM). The average dwell-time switching signals are employed to describe time-varying characteristics of conditional transition probabilities governing the mode variations of HMM. By using the mode-dependent and parameter-dependent Lyapunov function approach, sufficient conditions are obtained for solving fault estimation and reconfiguration problems, such that the corresponding estimation error and closed-loop systems are input-tostate stable in the stochastic sense. Finally, effectiveness and applicability of the developed approach are validated via two numerical examples.
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