The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform
Jurgen Adamy - One of the best experts on this subject based on the ideXlab platform.
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A Nonlinear Controller for Input Amplitude and Rate Constrained Linear Systems
IEEE Transactions on Automatic Control, 2013Co-Authors: Klaus Kefferputz, Boris Fischer, Jurgen AdamyAbstract:This technical note presents a nonlinear state feedback controller for systems with linear dynamics subject to an Amplitude and rate limited actuator. The nonlinear state feedback facilitates faster convergence compared to linear state feedback while guaranteeing domains of attraction of similar size. The parametrization of the controller is done solving a convex optimization problem based on linear matrix inequalities (LMIs). Finally, an example illustrates that the controller achieves large stability regions and short settling times.
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AuCC - A saturating set point tracking controller for a class of nonlinear systems subject to Input Amplitude and rate constraints
2011Co-Authors: Klaus Kefferputz, Michael Jost, Thomas Gussner, Jurgen AdamyAbstract:We propose a new set point tracking controller for feedback linearizable nonlinear systems subject to simultaneous Input Amplitude and rate constraints. The saturating tracking controller can be deduced from a controller stabilizing the origin with a guaranteed domain of attraction and can be designed efficiently by solving a convex optimization problem.
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a tracking controller for linear systems subject to Input Amplitude and rate constraints
American Control Conference, 2011Co-Authors: Klaus Kefferputz, Jurgen AdamyAbstract:We propose a new set point tracking controller for plants subject to simultaneous Input Amplitude and rate constraints. Short settling times are achieved by allowing the controller to saturate. The tracking controller can be deduced from a controller stabilizing the origin with an associated domain of attraction. Additionally, no assumptions concerning the rate of the reference signal are necessary.
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ACC - A tracking controller for linear systems subject to Input Amplitude and rate constraints
Proceedings of the 2011 American Control Conference, 2011Co-Authors: Klaus Kefferputz, Jurgen AdamyAbstract:We propose a new set point tracking controller for plants subject to simultaneous Input Amplitude and rate constraints. Short settling times are achieved by allowing the controller to saturate. The tracking controller can be deduced from a controller stabilizing the origin with an associated domain of attraction. Additionally, no assumptions concerning the rate of the reference signal are necessary.
Klaus Kefferputz - One of the best experts on this subject based on the ideXlab platform.
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A Nonlinear Controller for Input Amplitude and Rate Constrained Linear Systems
IEEE Transactions on Automatic Control, 2013Co-Authors: Klaus Kefferputz, Boris Fischer, Jurgen AdamyAbstract:This technical note presents a nonlinear state feedback controller for systems with linear dynamics subject to an Amplitude and rate limited actuator. The nonlinear state feedback facilitates faster convergence compared to linear state feedback while guaranteeing domains of attraction of similar size. The parametrization of the controller is done solving a convex optimization problem based on linear matrix inequalities (LMIs). Finally, an example illustrates that the controller achieves large stability regions and short settling times.
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AuCC - A saturating set point tracking controller for a class of nonlinear systems subject to Input Amplitude and rate constraints
2011Co-Authors: Klaus Kefferputz, Michael Jost, Thomas Gussner, Jurgen AdamyAbstract:We propose a new set point tracking controller for feedback linearizable nonlinear systems subject to simultaneous Input Amplitude and rate constraints. The saturating tracking controller can be deduced from a controller stabilizing the origin with a guaranteed domain of attraction and can be designed efficiently by solving a convex optimization problem.
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a tracking controller for linear systems subject to Input Amplitude and rate constraints
American Control Conference, 2011Co-Authors: Klaus Kefferputz, Jurgen AdamyAbstract:We propose a new set point tracking controller for plants subject to simultaneous Input Amplitude and rate constraints. Short settling times are achieved by allowing the controller to saturate. The tracking controller can be deduced from a controller stabilizing the origin with an associated domain of attraction. Additionally, no assumptions concerning the rate of the reference signal are necessary.
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ACC - A tracking controller for linear systems subject to Input Amplitude and rate constraints
Proceedings of the 2011 American Control Conference, 2011Co-Authors: Klaus Kefferputz, Jurgen AdamyAbstract:We propose a new set point tracking controller for plants subject to simultaneous Input Amplitude and rate constraints. Short settling times are achieved by allowing the controller to saturate. The tracking controller can be deduced from a controller stabilizing the origin with an associated domain of attraction. Additionally, no assumptions concerning the rate of the reference signal are necessary.
S.h. Ardalan - One of the best experts on this subject based on the ideXlab platform.
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ICASSP - An analysis of sinusoidally excited delta-sigma modulators
ICASSP '87. IEEE International Conference on Acoustics Speech and Signal Processing, 1Co-Authors: S.h. Ardalan, J. PaulosAbstract:This paper introduces a new method of analysis for Delta-Sigma Modulators based on modeling the nonlinear quantizer with a linerized gain, obtained by minimizing a mean-square-error criterion[7], followed by an additive noise source representing distortion components. In the paper, Input-signal Amplitude dependencies of Delta-Sigma Modulator stability and signal to noise ratio are analyzed. It is shown that due to the nonlinearity of the quantizer, the signal-to-noise ratio of the modulator may decrease as the Input Amplitude increases prior to saturation. Also, a stable third-order Delta-Sigma Modulator may become unstable by increasing the Input Amplitude beyond a certain threshold. Both of these phenomenon are explained by the nonlinear analysis of this paper. The analysis is carried out sinusoidal excitations.
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Analysis of delta-sigma modulators with bandlimited Gaussian Inputs
ICASSP-88. International Conference on Acoustics Speech and Signal Processing, 1Co-Authors: S.h. ArdalanAbstract:Delta-sigma modulation is gaining widespread use as a monolithic analog-to-digital and digital-to-analog conversion technique in a wide variety of applications. The behavior of delta-sigma modulators depends on the statistics and nature of the Input signal. The behavior of the circuit is Input-Amplitude-dependent, due to the nonlinearity (two-level quantizer). The nonlinear behavior of high-order delta-sigma modulators with bandlimited Gaussian Inputs is analyzed. >
Hiromu Hirai - One of the best experts on this subject based on the ideXlab platform.
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improvement of settling performance by mode switching control with split initial value compensation based on Input shaper
IEEE Transactions on Industrial Electronics, 2013Co-Authors: Yoshihiro Maeda, Masatake Wada, Makoto Iwasaki, Hiromu HiraiAbstract:This paper presents a novel initial-value-compensation (IVC) technique for mode-switching-control approaches in the fast and precise positioning of mechatronic systems. Parameter perturbations in plant mechanism and/or actuator generally deteriorate the positioning performance. In order to realize the desired positioning performance with robust property against the perturbations, the mode-switching control with the IVC is one of the promising approaches, where the timing of the mode switching and the time interval of the IVC critically affect the compensation performance. However, the shortening in the IVC operation interval causes an increase in the Input Amplitude, which leads to deterioration of the positioning performance due to saturation in control Input. In this paper, therefore, a split IVC based on Input-shaping techniques is applied to prevent the Input Amplitude from being saturated and to provide adaptiveness and robustness against unknown parameter perturbations. The effectiveness of the proposed approach has been verified by experiments using a prototype of galvanoscanners.
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improvement of settling performance by mode switching control with split initial value compensation based on Input shaper
International Symposium on Industrial Electronics, 2011Co-Authors: Yoshihiro Maeda, Masatake Wada, Makoto Iwasaki, Hiromu HiraiAbstract:This paper presents a novel Initial Value Compensation (IVC) technique in the framework of mode switching control for the fast and precise positioning. The mode switching control with IVC is one of the promising approaches to provide the robust property against plant perturbations. However, the shortening in IVC operation interval causes the increase in Input Amplitude, which leads to the deterioration of positioning performance due to the saturation in control Input. In this research, therefore, a split initial value compensation based on Input shaping techniques is applied to prevent the Input Amplitude from being saturated, and to be adaptive and robust against unknown parameter variations. The effectiveness of the proposed approach has been verified by experiments using a prototype of galvano scanner.
J. Paulos - One of the best experts on this subject based on the ideXlab platform.
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ICASSP - An analysis of sinusoidally excited delta-sigma modulators
ICASSP '87. IEEE International Conference on Acoustics Speech and Signal Processing, 1Co-Authors: S.h. Ardalan, J. PaulosAbstract:This paper introduces a new method of analysis for Delta-Sigma Modulators based on modeling the nonlinear quantizer with a linerized gain, obtained by minimizing a mean-square-error criterion[7], followed by an additive noise source representing distortion components. In the paper, Input-signal Amplitude dependencies of Delta-Sigma Modulator stability and signal to noise ratio are analyzed. It is shown that due to the nonlinearity of the quantizer, the signal-to-noise ratio of the modulator may decrease as the Input Amplitude increases prior to saturation. Also, a stable third-order Delta-Sigma Modulator may become unstable by increasing the Input Amplitude beyond a certain threshold. Both of these phenomenon are explained by the nonlinear analysis of this paper. The analysis is carried out sinusoidal excitations.