the connectedness of region of asymptotic stability of time-delay systems is proved. We apply this to prove one important property of optimal control of a time-delay system. Namely, we have established that the region...
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the connectedness of region of asymptotic stability of time-delay systems is proved. We apply this to prove one important property of optimal control of a time-delay system. Namely, we have established that the region of asymptotic stability, which corresponds to the optimal control with respect to a functional of a certain type, will be wider than the region of asymptotic stability, corresponding to any admissible control. Copyright (C) 2019. the Authors. Published by Elsevier Ltd. All rights reserved.
In this work, a dynamic model of a twin screw feeder, for continuous tablet manufacturing, has been developed. In particular, a First Order Plus Dead Time (FOPDT) model has been suggested. the delayed dynamics depends...
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In this work, a dynamic model of a twin screw feeder, for continuous tablet manufacturing, has been developed. In particular, a First Order Plus Dead Time (FOPDT) model has been suggested. the delayed dynamics depends on operating conditions, equipment design and physical properties of the bulk solid. Model parameters are estimated by fitting the model to experimental data. Due to the nonlinear input-output relationships and the time delays involved, a Nonlinear Model Predictive control (NMPC) is investigated to maintain an accurate mass flow rate, withthe ultimate goal to improve product homogeneity in an inherently complex process. the performance of the designed control system is found to be satisfactory in a wide operating range and its potential use in a continuous manufacturing process is worth being investigated in the future. Copyright (C) 2019. the Authors. Published by Elsevier Ltd. All rights reserved.
this paper investigates tracking performances attainable in iterative learning control of linear discrete-time systems with unknown parameters in the presence of observation noise. the transient and steady-state perfo...
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this paper investigates tracking performances attainable in iterative learning control of linear discrete-time systems with unknown parameters in the presence of observation noise. the transient and steady-state performances are measured by the decay rate and the magnitude of tracking error, respectively. A trade-off relation between these performances is represented by the product of the direct terms of the plant and the learning law. Numerical simulations are conducted to observe the trade-off behaviors. Copyright (C) 2019. the Authors. Published by Elsevier Ltd. All rights reserved.
In the classic controlsystems analysis a known difficulty is to determine a transient output response when non-zero (discontinuous) initial conditions are present. this difficulty is overcome by means of the presente...
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In the classic controlsystems analysis a known difficulty is to determine a transient output response when non-zero (discontinuous) initial conditions are present. this difficulty is overcome by means of the presented input-output jump relations. For a system with order n and relative degree r = n - m, these relations relate the jump discontinuities of the input and its derivatives up to the order m - 1 to the jump discontinuities of the output and its derivatives up to the order n - 1. A simplified behavior theory is used in deducing these straightforward relations. A simple, complete solution to the initial conditions problem that uses neither generalized derivatives nor ad hoc assumptions is then presented. A detailed example illustrating this solution is included. Copyright (C) 2019. the Authors. Published by Elsevier Ltd. All rights reserved.
In this paper, we present a dynamic predictor-based controller, which is applied to a platoon of vehicles under a modified extended cooperative adaptive cruise control introduced in Montanaro et al. (2014). We show th...
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In this paper, we present a dynamic predictor-based controller, which is applied to a platoon of vehicles under a modified extended cooperative adaptive cruise control introduced in Montanaro et al. (2014). We show the advantages that the dynamic predictor control law offers. A comparison withthe control without predictor is made. An illustrative example is presented. Copyright (C) 2019. the Authors. Published by Elsevier Ltd. All rights reserved.
We present a MATLAB toolbox with several well-known algorithms to test the structural and strong structural controllability of linear systems. For structural controllability a function to determine the dimension of th...
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We present a MATLAB toolbox with several well-known algorithms to test the structural and strong structural controllability of linear systems. For structural controllability a function to determine the dimension of the structurally reachable subspace and a function for calculating the generic rank of a matrix are provided. the strong structural controllability functions are based on different algorithms, where one of the algorithms has a linear time complexity. Additionally the toolbox provides functions to handle uncertain systems and signed systems. To check the correctness and performance of the functions several test scripts are included. the help browser provides additional information to the user. the toolbox is useful for analyzing structured systems given in state space form. It may also be used for teaching the methods of structural analysis. It is intended to expand the toolbox with further algorithms for structural analysis. Copyright (C) 2019. the Authors. Published by Elsevier Ltd. All rights reserved.
this paper presents a systematic frequency domain approach to analyse the stability of reduced-order linear systems with single delay. More precisely, we address the problem of the spectral abscissa characterization a...
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this paper presents a systematic frequency domain approach to analyse the stability of reduced-order linear systems with single delay. More precisely, we address the problem of the spectral abscissa characterization and the coexistence of non oscillating modes for such functional differential equations. the dominancy of such non oscillating modes is analytically shown for the considered reduced order Time-delay systems. Copyright (C) 2019. the Authors. Published by Elsevier Ltd. All rights reserved.
the paper considers the problem of reachability and observability finite interval gramians computation and approximation for linear time-varying systems. Both gramians are obtained from system trajectories. the reacha...
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the paper considers the problem of reachability and observability finite interval gramians computation and approximation for linear time-varying systems. Both gramians are obtained from system trajectories. the reachability gramian is derived from the adjoint state impulse response and the observability gramian is obtained from the zero-input output response. the application of the adjoint system is discussed and the two basic impulse response characteristics, namely the regular and the adjoint state impulse responses are presented. the relation withthe linear time-invariant case is also discussed and the role of the state transition matrix for computing the gramians is shown. An algorithm for derivation of the state transition matrix is proposed, which is based on the integration of the state equation by using the method of Runge-Kutta. the gramians are approximated in terms of Legendre orthogonal series representations of system trajectories. Copyright (C) 2019. the Authors. Published by Elsevier Ltd. All rights reserved.
In subsea applications there are an increasing demand for Remotely Operated Vehicles (ROV's). this study examines a BlueROV2 inspection ROV prototype for autonomous operation in three-dimensional space. this study...
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In subsea applications there are an increasing demand for Remotely Operated Vehicles (ROV's). this study examines a BlueROV2 inspection ROV prototype for autonomous operation in three-dimensional space. this study describes the ROV modelling, identification, control development and closed-loop simulations and experiments. the main transmitter applied for the navigation is an Underwater Acoustic Positioning System (UAPS) which acts as an underwater GPS unit. the transmitter introduces a dominant output time delay which is handled by a smith predictor. the results show that the smith predictor does not handle the time delay well, probably because the time delay is time-variant. Online identification of the time delay is proposed as a potential solution for minimizing the impact of the time delay variations over time. Copyright (C) 2019. the Authors. Published by Elsevier Ltd. All rights reserved.
this paper deals withthe problem of stabilization of systems with a constant delay in the actuator. the time-delay is unknown and can be considerably long, involving an interesting challenge from the control point of...
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this paper deals withthe problem of stabilization of systems with a constant delay in the actuator. the time-delay is unknown and can be considerably long, involving an interesting challenge from the control point of view. the proposed control scheme is based on a set of infinite dimensional observers with an adaptive time-delay estimation. the convergence of the observers is studied considering the time-varying delays introduced by the delay estimation. A stability analysis of the closed-loop control system is provided. the proposed observer-based controller is tested by means of numerical simulation, considering an unstable plant. Copyright (C) 2019. the Authors. Published by Elsevier Ltd. All rights reserved.
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