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作者：Xu, Kang-Li; Jiang, Yao-Lin
作者单位：Xi'an Jiaotong University
摘要：In this article, we propose a new frequency-limited Riemannian geometric-nonlinear conjugate gradient model order reduction (MOR) method with the modified Armijo step-size control to solve the frequency-limited H(2 )optimal MOR problem of linear port-Hamiltonian systems. This problem is formulated as a Riemannian optimization problem on the product of several manifolds. Based on the geometric properties of the product manifold, the Riemannian gradient of the cost function is derived. Further, ...
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作者：Zhao, Shengchao; Liu, Yongchao
作者单位：Dalian University of Technology
摘要：The popular AB /push-pull method for distributed optimization problem may unify much of the existing decentralized first-order methods based on gradient tracking technique. More recently, the stochastic gradient variant of AB /push-pull method ( S - AB ) has been proposed, which achieves the linear rate of converging to a neighborhood of the global minimizer when the step-size is constant. This article is devoted to the asymptotic properties of S - AB with diminishing step-size. Specifically, ...
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作者：Han, Zhiji; Liu, Zhijie; Wang, Jun-Wei; He, Wei
作者单位：University of Science & Technology Beijing; University of Science & Technology Beijing; University of Science & Technology Beijing
摘要：In this article, we propose an adaptive fault-tolerant control strategy for flexible string systems and extend the result to Euler-Bernoulli beam systems under deferred and asymmetric boundary partial output constraints. The designed control strategies consist of a boundary control law and two adaptive parameter update laws. A hyperbolic tangent function is applied to realize rejection to disturbance. With the adaptive technique, the unknown actuator faults are compensated. The deferred partia...
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作者：Li, Bin; Guan, Tao; Guan, Xiaoyi; Zhang, Kai; Yiu, Ka-Fai Cedric
作者单位：Sichuan University; Hong Kong Polytechnic University
摘要：A sliding mode controller is proposed for the attitude control of spacecraft reorientation with attitude constraints. By introducing a potential function, a novel sliding function is designed. With the structure of the proposed sliding function, uniqueness of the equilibrium and fixed-time convergence are rigorously proven. Another advantage of the proposed controller is that the feasibility of attitude constraints can be proven not only on the sliding surface but also outside it. Moreover, th...
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作者：Liu, Rongjian; Lu, Jianquan; Liu, Yang; Yin, Xiang; Hadjicostis, Christoforos N.
作者单位：Chongqing Normal University; Southeast University - China; Southeast University - China; Zhejiang Normal University; Shanghai Jiao Tong University; University of Cyprus
摘要：In this article, we investigate the enforcement of (current-state) opacity, an important information-flow security property, via insertion functions. An insertion function is an obfuscation mechanism that inserts fictitious events to the outputs in order to confuse the outside observer (intruder) such that the secret of the system is not revealed. In some situations, the secret may be revealed when the insertion mechanism is (or becomes) publicly known. This leads to the problem of synthesizin...
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作者：O'Neil, Sean; Schirmer, Sophie; Langbein, Frank C.; Weidner, Carrie A.; Jonckheere, Edmond A.
作者单位：University of Southern California; Swansea University; Cardiff University; University of Bristol
摘要：A strictly time-domain. formulation of the log-sensitivity of the error signal to structured plant uncertainty is presented and analyzed through simple but representative classical and quantum systems. Results demonstrate that across a wide range of physical systems, maximization of performance (minimization of the error signal) asymptotically or at a specific time comes at the cost of increased log-sensitivity, implying a time-domain constraint analogous to the frequency-domain identity S(s) ...
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作者：Che, Weiming; Forni, Fulvio
作者单位：University of Cambridge
摘要：We present a design framework that combines positive and negative feedback for robust stable oscillations in closed loop. The design is initially based on graphical methods, to guide the selection of the overall strength of the feedback (gain) and of the relative proportion of positive and negative feedback (balance). The design is then generalized via linear matrix inequalities. The goal is to guarantee robust oscillations to bounded dynamic uncertainties and to extend the approach to passive...
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作者：Chen, Guangwei; Vazquez, Rafael; Liu, Zhitao; Su, Hongye
作者单位：Beijing University of Technology; University of Sevilla; Zhejiang University
摘要：This article considers a class of hyperbolic-parabolic partial differential equation (PDE) system with some interior mixed-coupling terms, a rather unexplored family of systems. The family of systems we explore contains several interior-coupling terms, which makes controller design more challenging. Our goal is to design a boundary controller to exponentially stabilize the coupled system. For that, we propose a controller whose design is based on the backstepping method. Under this controller,...
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作者：Ma, Chenglin; Zhao, Huaizhong
作者单位：Shandong University; Durham University; Shandong University
摘要：In this article, a stochastic optimal control problem is considered for a continuous-time Markov chain taking values in a denumerable state space over a fixed finite horizon. The optimality criterion is the probability that the process remains in a target set before and at a certain time. The optimal value is a superadditive capacity of target sets. Under some minor assumptions for the controlled Markov process, we establish the dynamic programming principle, based on which we prove that the v...
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作者：Schaefer, Lukas; Gruber, Felix; Althoff, Matthias
作者单位：Technical University of Munich; Bosch
摘要：Ensuring robust constraint satisfaction for an infinite-time horizon is a challenging, yet crucial task when deploying safety-critical systems. In this article, we address this issue by synthesizing robust control invariant sets of perturbed nonlinear sampled-data systems. This task can be encoded as a nonconvex program that we approximate by a tailored, computationally efficient successive convexification algorithm. Based on the zonotopic representation of invariant sets, we obtain an updated...
