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最新文章

• Single Module Identifiability in Linear Dynamic Networks With Partial Excitation and Measurement AI翻译
  作者：Shi, Shengling; Cheng, Xiaodong; Van den Hof, Paul M. J.
  作者单位：Eindhoven University of Technology; University of Cambridge
  摘要：Identifiability of a single module in a network of transfer functions is determined by whether a particular transfer function in the network can be uniquely distinguished within a network model set, on the basis of data. Whereas previous research has focused on the situations that all network signals are either excited or measured, we develop generalized analysis results for the situation of partial measurement and partial excitation. As identifiability conditions typically require a sufficien...
• Adaptive Control of Hyperbolic PDEs Coupled With a Disturbed and Highly Uncertain ODE AI翻译
  作者：Wang, Ji; Tang, Shu-Xia; Krstic, Miroslav
  作者单位：Xiamen University; Texas Tech University System; Texas Tech University; University of California System; University of California San Diego
  摘要：In this article, we address adaptive output-feedback boundary control of coupled hyperbolic partial differential equations (PDEs) with spatially varying coefficients and on a time-varying domain, whose uncontrolled boundary is coupled with a disturbed ordinary differential equation (ODE), where multiple parameters in the state matrix and the amplitudes of the harmonic disturbance are unknown. The asymptotic convergence to zero of the ODE state and the boundedness of the PDE states are ensured....
• Restart of Accelerated First-Order Methods With Linear Convergence Under a Quadratic Functional Growth Condition AI翻译
  作者：Alamo, Teodoro; Krupa, Pablo; Limon, Daniel
  作者单位：University of Sevilla
  摘要：Accelerated first-order methods, also called fast gradient methods, are popular optimization methods in the field of convex optimization. However, they are prone to suffer from oscillatory behavior that slows their convergence when medium to high accuracy is desired. In order to address this, restart schemes have been proposed in the literature, which seek to improve the practical convergence by suppressing the oscillatory behavior. This article presents a restart scheme for accelerated first-...
• DC Power Grids With Constant-Power Loads-Part II: Nonnegative Power Demands, Conditions for Feasibility, and High-Voltage Solutions AI翻译
  作者：Jeeninga, Mark; De Persis, Claudio; van der Schaft, Arjan
  作者单位：Polytechnic University of Turin; University of Groningen
  摘要：In this two-part article, we develop a unifying framework for the analysis of the feasibility of the power flow equations for dc power grids with constant-power loads. Part II of this article, explores further implications of the results in Part I. We present a necessary and sufficient linear matrix inequality (LMI) condition for the feasibility of a vector of power demands (under small perturbation), which extends a necessary condition in the literature. The alternatives of these LMI conditio...
• A High-Order Sliding-Mode Adaptive Observer for Uncertain Nonlinear Systems AI翻译
  作者：Rios, Hector; Franco, Roberto; Ferreira de Loza, Alejandra; Efimov, Denis
  作者单位：Consejo Nacional de Ciencia y Tecnologia (CONACyT); Instituto Politecnico Nacional - Mexico; Inria; Universite de Lille; Centre National de la Recherche Scientifique (CNRS)
  摘要：A high-order sliding-mode adaptive observer is proposed to solve the problem of an adaptive estimation, i.e., the simultaneous estimation of the state and parameters, for a class of uncertain nonlinear systems in the presence of external disturbances, which do not need to satisfy a relative degree condition equal to one. This approach is based on a high-order sliding-mode observer and a nonlinear parameter identification algorithm. The practical, global, and uniform asymptotic stability of the...
• DC Power Grids With Constant-Power Loads-Part I: A Full Characterization of Power Flow Feasibility, Long-Term Voltage Stability, and Their Correspondence AI翻译
  作者：Jeeninga, Mark; De Persis, Claudio; van der Schaft, Arjan
  作者单位：Polytechnic University of Turin; University of Groningen
  摘要：In this two-part article, we develop a unifying framework for the analysis of the feasibility of the power flow equations for dc power grids with constant-power loads. In Part I of this article, we present a detailed introduction to the problem of power flow feasibility of such power grids, and the associated problem of selecting a desirable operating point which satisfies the power flow equations. We introduce and identify all long-term voltage semistable operating points, and show that there...
• An Explicit Reference Governor for Linear Sampled-Data Systems With Disturbance Inputs and Uncertain Time Delays AI翻译
  作者：Li, Nan; Geng, Sijia; Kolmanovsky, Ilya; Girard, Anouck
  作者单位：University of Michigan System; University of Michigan; University of Michigan System; University of Michigan
  摘要：In this article, we propose a novel reference governor (RG) scheme for prestabilized linear sampled-data systems to satisfy pointwise-in-time constraints in the presence of bounded disturbances and uncertain input and/or measurement delays. Based on an explicit bound on the system response to step changes in the reference signal derived using the logarithmic norm, this RG scheme yields a closed-form solution for updating the reference signal at sample time instants that guarantees both sample-...
• Policy Synthesis for Switched Linear Systems With Markov Decision Process Switching AI翻译
  作者：Wu, Bo; Cubuktepe, Murat; Djeumou, Franck; Xu, Zhe; Topcu, Ufuk
  作者单位：University of Texas System; University of Texas Austin; Arizona State University; Arizona State University-Tempe
  摘要：In this article, we study the synthesis of mode switching protocols for a class of discrete-time switched linear systems in which the mode jumps are governed by Markov decision processes (MDPs). We call such systems MDP-JLS for brevity. Each state of the MDP corresponds to a mode in the switched system. The probabilistic state transitions in the MDP represent the mode transitions. We focus on finding a policy that selects the switching actions at each mode such that the switched system is guar...
• Polynomial-Time Verification and Enforcement of Delayed Strong Detectability for Discrete-Event Systems AI翻译
  作者：Zhang, Kuize
  作者单位：University of Surrey
  摘要：Detectability is a fundamental property in partially observed dynamical systems. It describes whether one can use observed output sequences to determine the current and subsequent states. Delayed detectability generalizes detectability in the sense that when doing state estimation at a time instant, some outputs after the instant are also considered, making the estimation more accurate. In this article, we use a novel concurrent-composition method to give polynomial-time algorithms for verifyi...
• Excitation for Adaptive Optimal Control of Nonlinear Systems in Differential Games AI翻译
  作者：Karg, Philipp; Koepf, Florian; Braun, Christian A.; Hohmann, Soeren
  作者单位：Helmholtz Association; Karlsruhe Institute of Technology
  摘要：This article focuses on the fulfillment of the persistent excitation (PE) condition for signals which result from transformations by means of polynomials. This is essential, e.g., for the convergence of adaptive dynamic programming algorithms due to commonly used polynomial function approximators. As theoretical statements are scarce regarding the nonlinear transformation of PE signals, we propose conditions on the system state such that its transformation by polynomials is PE. To validate our...