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作者：Khong, Sei Zhen; Kao, Chung-Yao
作者单位：National Sun Yat Sen University
摘要：Consider a linear time-invariant feedback system consisting of two open-loop stable subsystems. In this note, it is established that if such feedback system is stable for one subsystem being any arbitrarily passive system, then the other subsystem must be output strictly passive.
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作者：Liu, Fengjiao; Morse, A. Stephen
作者单位：Yale University
摘要：It is well known that the fixed spectrum (i.e., the set of fixed modes) of a multichannel linear system plays a central role in the stabilization of such a system with decentralized control. A parameterized multichannel linear system is said to be structurally complete if it has no fixed spectrum for almost all parameter values. Necessary and sufficient algebraic conditions are presented for a multichannel linear system with dependent parameters to be structurally complete. An equivalent graph...
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作者：Braun, Sarah; Albrecht, Sebastian; Lucia, Sergio
作者单位：Dortmund University of Technology
摘要：Adversarial attacks on controllers of dynamic systems have become a serious threat to many real-world systems, making methods for fast identification of attacks an indispensable part of autonomous systems. With the increasing use of model-based controllers, it is valid to exploit model knowledge also for attack identification as long as privacy of individual components is maintained. A scalable, model-based method to reveal generic attacks was introduced in our previous work and is further inv...
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作者：Feiling, Jan; Belabbas, Mohamed-Ali; Ebenbauer, Christian
作者单位：University of Stuttgart; University of Illinois System; University of Illinois Urbana-Champaign; RWTH Aachen University
摘要：In this article, multivariable derivative-free optimization algorithms for unconstrained optimization problems are developed. A novel procedure for approximating the gradient of multivariable objective functions based on noncommutative maps is introduced. The procedure is based on the construction of an exploration sequence to specify where the objective function is evaluated and the definition of so-called gradient generating functions which are composed with the objective function, such that...
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作者：Giaccagli, Mattia; Astolfi, Daniele; Andrieu, Vincent; Marconi, Lorenzo
作者单位：Centre National de la Recherche Scientifique (CNRS); Universite Claude Bernard Lyon 1; University of Bologna
摘要：In this article, we study the problem of constant output regulation for a class of input-affine multi-input multi-output nonlinear systems, which do not necessarily admit a normal form. We allow the references and the disturbances to be arbitrarily large and the initial conditions of the system to range in the full-state space. We cast the problem in the contraction framework, and we rely on the common approach of extending the system with an integral action processing the regulation error. We...
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作者：Talebi, Shahriar; Alemzadeh, Siavash; Rahimi, Niyousha; Mesbahi, Mehran
作者单位：University of Washington; University of Washington Seattle
摘要：Learning, say through direct policy updates, often requires assumptions such as knowing a priori that the initial policy (gain) is stabilizing, or persistently exciting (PE) input-output data, is available. In this article, we examine online regulation of (possibly unstable) partially unknown linear systems with no prior access to an initial stabilizing controller nor PE input-output data; we instead leverage the knowledge of the input matrix for online regulation. First, we introduce and char...
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作者：Zhu, Jin; Xia, Kai; Ling, Qiang; Chen, Wei; Dullerud, Geir E.
作者单位：Chinese Academy of Sciences; University of Science & Technology of China, CAS; University of Illinois System; University of Illinois Urbana-Champaign
摘要：This article is devoted to a specific kind of discrete-time switched linear systems, where the switching signal is governed by a Markov chain, i.e., Markovian jump linear systems. For such systems, a mode feedback control mechanism is adopted to adjust the mode transition probability matrix, which is referred to as the switching law design, and the optimal mode feedback controller is sought to minimize a quadratic performance index containing both the system state and the mode feedback control...
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作者：Bueno, Jose Nuno A. D.; Marcos, Lucas B.; Rocha, Kaio D. T.; Terra, Marco H.
作者单位：Universidade de Sao Paulo
摘要：When discrete-time Markov jump linear systems are prone to the damaging effects of polytopic uncertainties, it is necessary to address all the vertices of each Markov mode in order to properly design robust controllers. To this end, we propose a robust recursive linear-quadratic regulator for this class of systems. We define a quadratic min-max optimization problem by combining least-squares and penalty functions in a unified framework. We design a one-step cost function to encompass the entir...
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作者：Fei, Zhongyang; Yang, Liu; Sun, Xi-Ming; Ren, Shunqing
作者单位：Dalian University of Technology; Harbin Institute of Technology
摘要：In this article, a novel set-membership state estimation method based on zonotopes is proposed for switched systems subject to unknown-but-bounded disturbance with average dwell time (ADT) switching. By testing the consistency between the system model and measured output, an intersection zonotope is constructed based on mode-dependent and semitime-dependent correction matrix. Then, by constructing semitime-dependent P-radius functions, the issue of L, disturbance attenuation performance for th...
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作者：Shao, Yu; Park, Ju H.; Xu, Shengyuan
作者单位：Nanjing University of Science & Technology; Yeungnam University
摘要：This article is devoted to the global continuous control for stochastic low-order cascade nonlinear systems with time-varying delay and stochastic inverse dynamics. Compared with existing results, the nature of only continuous, but nonsmooth, is unfolded since the power of the stochastic cascade system is of low order; and all the traditional growth conditions on unknown drift and diffusion nonlinearities and local Lipschitz condition are quitted, which largely extends the scope of application...
