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Articles de revues sur le sujet « Adaptive disturbance attenuation »

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Auteur : Grafiati
Publié le 10 mars 2023

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1

Battistelli, Giorgio, Daniele Mari, Daniela Selvi, Alberto Tesi et Pietro Tesi. « Switching Control for Adaptive Disturbance Attenuation ». IFAC Proceedings Volumes 47, no 3 (2014) : 1483–88. http://dx.doi.org/10.3182/20140824-6-za-1003.01556.

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2

Pang, Hongbo, et Jun Zhao. « Adaptive feedback passivity-based disturbance attenuation for switched nonlinearly parameterized systems ». Transactions of the Institute of Measurement and Control 39, no 12 (3 juin 2016) : 1811–20. http://dx.doi.org/10.1177/0142331216649432.

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This paper investigates the adaptive feedback passification and disturbance attenuation problems for a class of switched nonlinearly parameterized systems. First, a state-dependent switching law and a set of adaptive feedback controllers with new control inputs are designed to render the resulting closed-loop system passive for a class of switched nonlinearly parameterized systems without external disturbance. Then, the new control inputs are designed to solve the disturbance attenuation problem. Second, a set of adaptive feedback controllers and a composite state-dependent switching law are designed to solve the adaptive feedback passivity-based disturbance attenuation problem for a class of cascaded switched nonlinearly parameterized systems. A numerical example shows the effectiveness of the proposed method.
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3

Chichka, D. F., et J. L. Speyer. « A Disturbance Attenuation Approach to Adaptive Control ». IFAC Proceedings Volumes 26, no 2 (juillet 1993) : 207–12. http://dx.doi.org/10.1016/s1474-6670(17)48254-1.

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4

Battistelli, Giorgio, Daniele Mari, Daniela Selvi, Alberto Tesi et Pietro Tesi. « Adaptive disturbance attenuation via logic-based switching ». Systems & ; Control Letters 73 (novembre 2014) : 48–57. http://dx.doi.org/10.1016/j.sysconle.2014.09.003.

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5

Chichka, D. F., et J. L. Speyer. « An adaptive controller based on disturbance attenuation ». IEEE Transactions on Automatic Control 40, no 7 (juillet 1995) : 1220–33. http://dx.doi.org/10.1109/9.400489.

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6

Zeng, Sheng. « Adaptive Speed Control Design for Brushed Permanent Magnet DC Motor Based on Worst-Case Analysis Approach ». Mathematical Problems in Engineering 2013 (2013) : 1–15. http://dx.doi.org/10.1155/2013/698050.

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This paper presents the adaptive controller design for brushed permanent magnet DC motor used in velocity-tracking applications based on worst-case approach. We first formulate the robust adaptive control problem as a nonlinearH∞-control problem under imperfect state measurement, and then solve it using game-theoretic approach. The controller guarantees the boundedness of closed-loop signals with bounded exogenous disturbances, and achieves desired disturbance attenuation level with respect to the unmeasured exogenous disturbance inputs and the measured disturbance inputs. The strong robustness properties are illustrated by a simulation example.
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7

Wang, Zheng, et Jianping Yuan. « Non-linear disturbance observer-based adaptive composite anti-disturbance control for non-linear systems with dynamic non-harmonic multisource disturbances ». Transactions of the Institute of Measurement and Control 40, no 12 (11 septembre 2017) : 3458–65. http://dx.doi.org/10.1177/0142331217721967.

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In this paper, an adaptive composite anti-disturbance control structure is constructed for a class of non-linear systems with dynamic non-harmonic multisource disturbances. The key point of this paper is that a kind of non-harmonic disturbance, which has non-linear internal dynamics and complex features, is involved. A non-linear exogenous system is employed to describe the dynamic non-harmonic disturbances and several useful assumptions are introduced. By introducing a non-linear damping term, a novel adaptive non-linear disturbance observer is constructed. Based on the disturbance/uncertainty estimation and attenuation (DUEA) schemes, a composite anti-disturbance control structure is synthesized. Meanwhile, a new sufficient condition is derived and the stability of the closed-loop system is proved. Several illustrative examples are employed to demonstrate the effectiveness of the proposed method.
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8

YANIV, O., I. HOROWITZ et S. OLDAK. « Disturbance attenuation in single-loop dithered adaptive systems ». International Journal of Control 48, no 1 (juillet 1988) : 179–92. http://dx.doi.org/10.1080/00207178808906168.

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9

Tezcan, I. Egemen, et Tamer Bas¸ar. « Disturbance Attenuating Adaptive Controllers for Parametric Strict Feedback Nonlinear Systems With Output Measurements ». Journal of Dynamic Systems, Measurement, and Control 121, no 1 (1 mars 1999) : 48–57. http://dx.doi.org/10.1115/1.2802441.

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We present a systematic procedure for designing H∞-optimal adaptive controllers for a class of single-input single-output parametric strict-feedback nonlinear systems that are in the output-feedback form. The uncertain nonlinear system is minimum phase with a known relative degree and known sign of the high-frequency gain. We use soft projection on the parameter estimates to keep them bounded in the absence of persistent excitations. The objective is to obtain disturbance attenuating output-feedback controllers which will track a smooth bounded trajectory and keep all closed-loop signals bounded in the presence of exogenous disturbances. Two recent papers (Pan and Bas¸ar, 1996a; Marino and Tomei, 1995) addressed a similar problem with full state information, using two different approaches, and obtained asymptotically tracking and disturbance-attenuating adaptive controllers. Here, we extend these results to the output measurement case for a class of minimum phase nonlinear systems where the nonlinearities depend only on the measured output. It is shown that arbitrarily small disturbance attenuation levels can be obtained at the expense of increased control effort. The backstepping methodology, cost-to-come function based H∞ -filtering and singular perturbations analysis constitute the framework of our robust adaptive control design scheme.
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10

Liu, Ting, Nan Jiang, Yuanwei Jing et Siying Zhang. « Nonlinear Robust Disturbance Attenuation Control Design for Static Var Compensator in Power System ». Mathematical Problems in Engineering 2013 (2013) : 1–9. http://dx.doi.org/10.1155/2013/747641.

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The problem of designing an adaptive backstepping controller for nonlinear static var compensator (SVC) system is addressed adopting two perspectives. First, instead of artificially assuming an upper bound or inequality scaling, the minimax theory is used to treat the external unknown disturbances. The system is insensitive to effects of large disturbances due to taking into account the worst case disturbance. Second, a parameter projection mechanism is introduced in adaptive control to force the parameter estimate within a prior specified interval. The proposed controller handles the nonlinear parameterization without compromising control smoothness and at the same time the parameter estimate speed is improved and the robustness of system is strengthened. Considering the short-circuit ground fault and mechanical power perturbation, a simulation study is carried out. The results show the effectiveness of the proposed control method.
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11

Cao, Teng, Huajun Gong, Huiyunuo Xiao et Yixuan Xue. « Finite-Time Attitude Tracking Control for Hypersonic Flight Vehicles with Actuator Saturation ». International Journal of Aerospace Engineering 2022 (23 novembre 2022) : 1–15. http://dx.doi.org/10.1155/2022/5419377.

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This paper investigates finite-time attitude tracking control strategies for hypersonic flight vehicles (HFVs) with parameter uncertainties, external disturbances, and actuator saturations by applying sliding model control, adaptive mechanism, and nonlinear disturbance observer techniques. A nonlinear dynamic model of HFV attitude system in reentry flight phase is established. Then, a basic attitude control method of the HFV system is designed based on a terminal sliding mode control (TSMC) scheme to accommodate the system-lumped disturbance torques and guarantee the finite-time stability. To relax the prior knowledge of bounded lumped disturbance of the TSMC-based HFV attitude system, an adaptive TSMC (ATSMC) scheme is proposed. In order to relax the limit of compound uncertainties and attenuate chattering phenomenon of the TSMC-based HFV attitude system, a nonlinear disturbance observer-based TSMC (DO-TSMC) scheme is presented, which enhances the disturbance attenuation and robust tracking performance. Finally, simulation results of a generic X-33 nonlinear model exhibit the effectiveness of the proposed TSMC, ATSMC, and DO-TSMC schemes.
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12

Tohidi, Hossein, et Koksal Erenturk. « Robust Adaptive Fault-Tolerant Tracking Control of Three-Phase Induction Motor ». Advances in Electrical Engineering 2014 (4 septembre 2014) : 1–7. http://dx.doi.org/10.1155/2014/915072.

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This paper deals with the problem of induction motor tracking control against actuator faults and external disturbances using the linear matrix inequalities (LMIs) method and the adaptive method. A direct adaptive fault-tolerant tracking controller design method is developed based on Lyapunov stability theory and a constructive algorithm based on linear matrix inequalities for online tuning of adaptive and state feedback gains to stabilize the closed-loop system in order to reduce the fault effect with disturbance attenuation. Simulation results reveal the merits of proposed robust adaptive fault-tolerant tracking control scheme on an induction motor subjected to actuator faults.
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13

Li, Wen Lei. « Nonlinear Coordinated Control for SVC and Generator Excitation Based on Sliding Mode Dynamic Surface Method ». Applied Mechanics and Materials 229-231 (novembre 2012) : 2302–5. http://dx.doi.org/10.4028/www.scientific.net/amm.229-231.2302.

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Based on sliding mode dynamic surface method and disturbance attenuation technique, the nonlinear adaptive robust controllers of power systems coordinated control for SVC and generator excitation is proposed in this paper. In the sliding mode dynamic surface method, parameter adaptive laws are not based on the certain equivalent criterion. Because during controller design procedure besides the external disturbances are considered, the parametric uncertainties are mainly considered also, thus it can guarantee the whole errors system asymptotically stable under the derived controller.
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14

Zhang, Haibo, Dayi Wang, Chunling Wei et Bing Xiao. « End-Effector Trajectory Tracking Control of Space Robot withL2Gain Performance ». Mathematical Problems in Engineering 2015 (2015) : 1–9. http://dx.doi.org/10.1155/2015/175342.

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This paper presents a novel solution to the control problem of end-effector robust trajectory tracking for space robot. External disturbance and system uncertainties are addressed. For the considered robot operating in free-floating mode, a Chebyshev neural network is introduced to estimate system uncertainties and external disturbances. An adaptive controller is then proposed. The closed-loop system is guaranteed to be ultimately uniformly bounded. The key feature of this proposed approach is that, by choosing appropriate control gains, it can achieve any given small level ofL2gain disturbance attenuation from external disturbance to system output. The tracking performance is evaluated through a numerical example.
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15

Wang, Zheng, Jianping Yuan et Jinyuan Wei. « Adaptive output feedback disturbance attenuation control for nonlinear systems with non-harmonic multisource disturbances ». Optik 137 (mai 2017) : 85–95. http://dx.doi.org/10.1016/j.ijleo.2017.02.070.

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16

Saleem, Omer, Mohsin Rizwan et Fahim Gohar Awan. « Robustification of the state-space MRAC law for under-actuated systems via fuzzy-immunological computations ». Science Progress 105, no 3 (juillet 2022) : 003685042211222. http://dx.doi.org/10.1177/00368504221122291.

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This paper formulates an enhanced Model-Reference-Adaptive-Controller (MRAC) that is augmented with a fuzzy-immune adaptive regulator to strengthen the disturbance-attenuation capability of closed-loop under-actuated systems. The proposed scheme employs the conventional state-space MRAC and augments it with a pre-configured fuzzy-immune mechanism that acts as a superior regulator to dynamically modulate the adaptation gains of the Lyapunov gain-adjustment law. The immunological computations increase the controller's adaptability to flexibly manipulate the damping control effort under exogenous disturbances. The efficacy of the proposed Immune-MRAC law is comparatively analyzed under practical disturbance conditions by conducting real-time hardware experiments on the QNET rotary pendulum. The experimental outcomes validate the faster transient-recovery behavior and stronger damping effort of the proposed control law against the exogenous disturbances while preserving the system's asymptotic stability and control energy efficiency.
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17

Li, Rong, et Xiao hong Jiao. « Adaptive control with disturbance attenuation for hydraulic active suspension system ». International Journal of Modelling, Identification and Control 17, no 1 (2012) : 78. http://dx.doi.org/10.1504/ijmic.2012.048642.

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18

Shen, Tielong, Katsutoshi Tamura, Shengwei Mei, Qiang Lu et Wei Hu. « Adaptive Nonlinear Control with Disturbance Attenuation for Multimachine Power Systems ». IFAC Proceedings Volumes 34, no 13 (août 2001) : 705–10. http://dx.doi.org/10.1016/s1474-6670(17)39075-4.

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19

Sun, Zong-Yao, Cui-Hua Zhang et Zhuo Wang. « Adaptive disturbance attenuation for generalized high-order uncertain nonlinear systems ». Automatica 80 (juin 2017) : 102–9. http://dx.doi.org/10.1016/j.automatica.2017.02.036.

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20

IDE, Hirofumi, et Hiromitsu OHMORI. « Deterministic Disturbance Attenuation of I&I Adaptive Control System ». Proceedings of the Symposium on the Motion and Vibration Control 2003.8 (2003) : 480–83. http://dx.doi.org/10.1299/jsmemovic.2003.8.480.

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21

Yoo, Sung Jin, Jin Bae Park et Yoon Ho Choi. « Adaptive dynamic surface control for disturbance attenuation of nonlinear systems ». International Journal of Control, Automation and Systems 7, no 6 (décembre 2009) : 882–87. http://dx.doi.org/10.1007/s12555-009-0602-0.

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22

Sutton, T. J., et S. J. Elliott. « Active Attenuation of Periodic Vibration in Nonlinear Systems Using an Adaptive Harmonic Controller ». Journal of Vibration and Acoustics 117, no 3A (1 juillet 1995) : 355–62. http://dx.doi.org/10.1115/1.2874460.

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The article describes a nonlinear adaptive controller for the attenuation of harmonic disturbances in nonlinear systems. The steepest descent algorithm is used to adapt the controller coefficients and synthesize the optimum periodic waveform at the input of the nonlinear system, giving the best attenuation of the disturbance. A simple frequencydomain model of the system is required to implement the steepest descent approach. The scheme is particularly applicable where the secondary actuator used for active vibration control is a nonlinear device such as a magnetostrictive actuator. Simulation studies show that an adaptive scheme of this type is robust to the choice of frequency-domain model when the nonlinearity is hysteretic, but much more sensitive when the nonlinearity is a saturation function. A real-time adaptive harmonic controller has been built and used to control the motion of a magnetostrictive actuator. With dc and 7 harmonics under control the system was able to overcome the inherent nonlinearity of the actuator at fundamental frequencies in excess of 3 kHz.
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23

Yu, Weiyong, et Fangfang Zhang. « Disturbance Attenuation via Output Feedback for Uncertain Nonlinear Systems with Output and Input Depending Growth Rate ». Mathematical Problems in Engineering 2014 (2014) : 1–8. http://dx.doi.org/10.1155/2014/621783.

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The problem of output feedback disturbance attenuation is investigated for a class of uncertain nonlinear systems. The uncertainties of the considered systems are bounded by unmeasured states with growth rate function of output and input multiplying an unknown constant. Based on a dynamic gain observer, an adaptive output feedback controller is proposed such that the states of the closed-loop system are globally bounded, and the disturbance attenuation is achieved in theL2-gain sense. An example is provided to demonstrate the effectiveness of the proposed design scheme.
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24

Zhang, Wenguang, et Wenjun Yi. « Gliding-Guided Projectile Attitude Tracking Controller Design Based on Improved Adaptive Twisting Sliding Mode Algorithm ». International Journal of Aerospace Engineering 2020 (31 octobre 2020) : 1–15. http://dx.doi.org/10.1155/2020/1480427.

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The finite-time attitude tracking control for gliding-guided projectile with unmatched and matched disturbance is investigated. An adaptive variable observer is used to provide estimation for the unmeasured state which contains unmatched disturbance. Then, an improved adaptive twisting sliding mode algorithm is proposed to compensate for the matched disturbance dynamically with better transient quality. Finally, a proof of the finite-time convergence of the closed-loop system under the disturbance observer and the adaptive twisting sliding mode-based controller is derived using the Lyapunov technique. This attitude tracking control scheme does not require any information on the bounds of uncertainties. Simulation results demonstrate that the proposed method which is able to acquire the minimum possible values of the control gains guaranteeing the finite-time convergence performs well in chattering attenuation and tracking precision.
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25

Shen, Tielong, Shengwei Mei, Qiang Lu, Wei Hu et Katsutoshi Tamura. « Adaptive nonlinear excitation control with L2 disturbance attenuation for power systems ». Automatica 39, no 1 (janvier 2003) : 81–89. http://dx.doi.org/10.1016/s0005-1098(02)00175-9.

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26

Deng, Hua, et Miroslav Krstić. « Output-feedback disturbance attenuation and adaptive control for stochastic nonlinear systems ». IFAC Proceedings Volumes 32, no 2 (juillet 1999) : 4977–82. http://dx.doi.org/10.1016/s1474-6670(17)56848-2.

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27

Shi, J., R. Zmood et L. Qin. « Synchronous disturbance attenuation in magnetic bearing systems using adaptive compensating signals ». Control Engineering Practice 12, no 3 (mars 2004) : 283–90. http://dx.doi.org/10.1016/s0967-0661(03)00095-9.

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28

Ge, Shuzhi Sam, et Thanh-Trung Han. « Semiglobal ISpS Disturbance Attenuation With Output Tracking via Direct Adaptive Design ». IEEE Transactions on Neural Networks 18, no 4 (juillet 2007) : 1129–48. http://dx.doi.org/10.1109/tnn.2007.899159.

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29

Marino, R., et P. Tomei. « Adaptive Tracking with Disturbance Attenuation for a Class of Nonlinear Systems * ». IFAC Proceedings Volumes 28, no 14 (juin 1995) : 109–14. http://dx.doi.org/10.1016/s1474-6670(17)46815-7.

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30

Randall, A., P. J. Reeve et A. F. MacAlister. « Disturbance Attenuation in a Hot Strip Rolling Mill via Feedforward Adaptive Control ». IFAC Proceedings Volumes 29, no 1 (juin 1996) : 6257–62. http://dx.doi.org/10.1016/s1474-6670(17)58685-1.

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31

Battilotti, Stefano, et Leonardo Lanari. « Adaptive disturbance attenuation with global stability for rigid and elastic joint robots ». Automatica 33, no 2 (février 1997) : 239–43. http://dx.doi.org/10.1016/s0005-1098(96)00144-6.

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32

Tomei, P. « Robust adaptive control of robots with arbitrary transient performance and disturbance attenuation ». IEEE Transactions on Automatic Control 44, no 3 (mars 1999) : 654–58. http://dx.doi.org/10.1109/9.751370.

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33

OCHI, Kazuo, Tielong SHEN, Katsutoshi TAMURA, Noriaki HENMI et Toru NAKAZAWA. « Adaptive Robust L2 Disturbance Attenuation Control for Pneumatic Valve with Unknown Friction. » Transactions of the Japan Society of Mechanical Engineers Series C 66, no 644 (2000) : 1215–22. http://dx.doi.org/10.1299/kikaic.66.1215.

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34

Liu, Kang, Hongbo Gao, Haibo Ji et Zhengyuan Hao. « Adaptive Sliding Mode Based Disturbance Attenuation Tracking Control for Wheeled Mobile Robots ». International Journal of Control, Automation and Systems 18, no 5 (26 décembre 2019) : 1288–98. http://dx.doi.org/10.1007/s12555-019-0262-7.

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35

Xu, Long, Jun Ping Wang, Yuan Bai et Gai Ling Hu. « Adaptive Robust Control for Driving and Regenerative Braking of Electric Vehicle ». Applied Mechanics and Materials 441 (décembre 2013) : 887–91. http://dx.doi.org/10.4028/www.scientific.net/amm.441.887.

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The driving and braking energy recovery system of electric vehicle faces a lot of uncertainties, including the system parameters and the running environment uncertainties. An adaptive robust control (ARC) is presented in this paper to treat the problems including disturbance and parameter variation in the design of driving and regenerative braking controller. It can enhance the stability robustness and performance robustness. A model of the driving and regenerative braking system is constructed and then the ARC controller is designed. The experiment results show that the controller based on ARC theory has better performance of stability, robustness, and disturbance attenuation than traditional PID controller.
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36

Ji, Honghai, Yuzhou Wei, Lingling Fan, Shida Liu, Yulin Wang et Li Wang. « Disturbance-Improved Model-Free Adaptive Prediction Control for Discrete-Time Nonlinear Systems with Time Delay ». Symmetry 13, no 11 (9 novembre 2021) : 2128. http://dx.doi.org/10.3390/sym13112128.

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This study proposes a Disturbance-improved Model-free Adaptive Prediction Control (DMFAPC) algorithm for a discrete-time nonlinear system with time delay and disturbance. The algorithm is shown to have good robustness. On the one hand, the Smith predictor is used to predict the output at a future time to eliminate the time delay in the system; on the other hand, an attenuation factor is introduced at the input to effectively eliminate the measurement disturbance. The proposed algorithm is a data-driven control algorithm that does not require the model information of the controlled system; it only requires the input and output data. The convergence of the DMFAPC is analyzed. Simulation results confirm the effectiveness of this algorithm.
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37

Krishnamurthy, P., et F. Khorrami. « Feedforward Systems With ISS Appended Dynamics : Adaptive Output-Feedback Stabilization and Disturbance Attenuation ». IEEE Transactions on Automatic Control 53, no 1 (février 2008) : 405–12. http://dx.doi.org/10.1109/tac.2007.914231.

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38

Kostarigka, A. K., et G. A. Rovithakis. « Adaptive Neural Network Tracking Control With Disturbance Attenuation for Multiple-Input Nonlinear Systems ». IEEE Transactions on Neural Networks 20, no 2 (février 2009) : 236–47. http://dx.doi.org/10.1109/tnn.2008.2005598.

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39

Wang, Yuzhen, Gang Feng, Daizhan Cheng et Yanhong Liu. « Adaptive L2 disturbance attenuation control of multi-machine power systems with SMES units ». Automatica 42, no 7 (juillet 2006) : 1121–32. http://dx.doi.org/10.1016/j.automatica.2006.03.014.

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40

Kim, Bong Keun, Hyun-Taek Choi, Wan Kyun Chung et Il Hong Suh. « Analysis and Design of Robust Motion Controllers in the Unified Framework ». Journal of Dynamic Systems, Measurement, and Control 124, no 2 (10 mai 2002) : 313–21. http://dx.doi.org/10.1115/1.1468995.

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Model based disturbance compensating methods such as disturbance observer, robust control with adaptive algorithm, enhanced internal model control are well known control structures for robust motion controller which can satisfy desired performance and robustness of high-speed/high-accuracy positioning systems. In this paper, these are analyzed in the unified framework and their design method is proposed. To do this, a generalized disturbance attenuation framework named RIC (robust internal-loop compensator) structure is introduced. Through parameterization based on RIC, it is shown that there are inherent equivalences in their structures and the proposed RIC gives a general design framework for the model based disturbance compensating methods. Through simulation, the proposed method is verified.
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41

Zeng, Sheng, et Zigang Pan. « Adaptive controller design and disturbance attenuation for SISO linear systems with noisy output measurements and partly measured disturbances ». International Journal of Control 82, no 2 (22 janvier 2009) : 310–34. http://dx.doi.org/10.1080/00207170802085011.

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42

Liang, Yalin, Yuyao He et Yun Niu. « Microgrid Frequency Fluctuation Attenuation Using Improved Fuzzy Adaptive Damping-Based VSG Considering Dynamics and Allowable Deviation ». Energies 13, no 18 (17 septembre 2020) : 4885. http://dx.doi.org/10.3390/en13184885.

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Recently, virtual synchronous generators (VSGS) are a hot topic in the area of microgrid control. However, the traditional fixed-parameter-based VSG control methods have an obvious disadvantage. Namely, if the damping value is set to be small, the amplitude of frequency deviations under external power disturbances is large, meaning that the frequency suppression capacity is insufficient, but if the damping value is large, the dynamics of the system will be greatly sacrificed. To solve the problem, taking the dynamic characteristics and the maximum allowable frequency deviation (MAFD) into account, in this paper an improved fuzzy adaptive damping-based VSG control strategy is proposed to simultaneously attenuate the microgrid frequency fluctuations and guarantee the system dynamics. Firstly, in order to address the necessity of using an adaptive damping-based VSG, the structure of a fixed-parameter VSG method that incorporates the f-p/Q-V droop controllers is introduced, based on which a small signal model is established to discuss the impacts of the virtual damping on the frequency response characteristics concerning the different penetration levels of power disturbances. Then, considering the dynamics and MAFD, a fuzzy adaptive controller is constructed relying on the well-designed membership functions, control rules and output scaling factors. The main feature of the improved fuzzy controller is that two alternative output scaling factors are employed to allow the system to be overdamped when the frequency deviation is large and undamped when the frequency deviation is small, balancing the frequency response dynamics and stability characteristics. To verify the effectiveness of the proposed fuzzy adaptive damping-based VSG technique, a computer simulation is conducted on a microgrid system in MATLAB/Simulink, and the obtained results are compared with the conventional droop control and fixed-parameter based VSGs. By using the proposed fuzzy adaptive damping-based VSG control method, the peak frequency deviations under the large power disturbances would become at least 8% lower compared to the traditional droop control and fixed-parameter VSG control, and meanwhile, the frequency response speed is fast when the disturbance stands at a low position. Consequently, it is valuable to promote the proposed techniques in engineering.
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Villano, Michelangelo, Fabiola Colone et Pierfrancesco Lombardo. « Antenna Array for Passive Radar : Configuration Design and Adaptive Approaches to Disturbance Cancellation ». International Journal of Antennas and Propagation 2013 (2013) : 1–16. http://dx.doi.org/10.1155/2013/920639.

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We consider the selection of an antenna array configuration, composed of a small number of omnidirectional elements, to be exploited for passive radar sensors. Based on properly identified pattern characteristics and design criteria for practical applications, a suitable planar configuration is selected that allows both angular selectivity and direct signal attenuation. The selected configuration is further optimized in terms of sidelobe level by resorting to appropriate amplitude tapering. Moreover, three different approaches are investigated for antenna-based adaptive disturbance cancellation, and a comparative performance analysis is carried out. Simulation results show that an effective clutter suppression is obtained if the direct signal from the transmitter is attenuated by means of spatial adaptive cancellation, and the multipath echoes from stationary obstacles are removed by means of temporal adaptive cancellation. In particular, the approach based on the Sidelobe Canceller is shown to yield good performance while requiring a limited system complexity.
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44

Pan, Zigang, et Tamer Başar. « Adaptive Controller Design for Tracking and Disturbance Attenuation in Parametric-Strict-Feedback Nonlinear Systems ». IFAC Proceedings Volumes 29, no 1 (juin 1996) : 2720–25. http://dx.doi.org/10.1016/s1474-6670(17)58087-8.

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45

Zigang Pan et T. Basar. « Adaptive controller design for tracking and disturbance attenuation in parametric strict-feedback nonlinear systems ». IEEE Transactions on Automatic Control 43, no 8 (1998) : 1066–83. http://dx.doi.org/10.1109/9.704978.

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46

Kwon, Wookyong, Jaepil Ban, Soohee Han, Chong Soo Lee et Sangchul Won. « Multicriteria Adaptive Observers for Singular Systems with Unknown Time-Varying Parameters ». Mathematical Problems in Engineering 2017 (2017) : 1–10. http://dx.doi.org/10.1155/2017/7343575.

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This paper proposes multicriteria adaptive observers for a class of singular systems with unknown time-varying parameters. Two criteria for theH∞disturbance attenuation level and the upper bound of an ultimate invariant set are scalarized into a single cost function and then it is minimized by varying the weight parameter, which creates the optimal trade-off curve or Pareto optimal points. The proposed multicriteria adaptive observers are shown to be able to easily include integral action for better robust performance. It is demonstrated with numerical simulations that the proposed multicriteria adaptive observers provide the good estimation accuracy and allow effective and compromising design by considering two different cost functions simultaneously.
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47

Yamato, Hideaki, Takayuki Furuta et Ken Tomiyama. « Attitude Determination by Globally and Asymptotically Stable Estimation of Gyroscope Bias Error with Disturbance Attenuation and Rejection ». Journal of Robotics and Mechatronics 24, no 2 (20 avril 2012) : 389–98. http://dx.doi.org/10.20965/jrm.2012.p0389.

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This paper presents a new methodology of attitude determination for cost-effective and small inertial measurement units, consisting of tri-axial gyroscope sensors, accelerometers, and geo-magnetometers. Introduced for algorithm development is a quaternion feedback structure, where bias terms in the gyroscope rate information, appearing in the feedback loop, are identified with the theoretical guarantee of global and asymptotical stability. The bias-term identification and modification process is performed continuously without the influence of disturbance by combining the proposed disturbance evaluation scheme and conventional vector matching method with an adaptive parameter configuration. Practical validity of the presented framework is fully evaluated by experiments. It is shown that the approach in this paper can offer drift-free performance with disturbance attenuation and rejection under arbitrary attitude test motion of spatial rotation and translation.
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48

Glushchenko, Anton, Konstantin Lastochkin et Vladislav Petrov. « DC Drive Adaptive Speed Controller Based on Hyperstability Theory ». Computation 10, no 3 (14 mars 2022) : 40. http://dx.doi.org/10.3390/computation10030040.

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The scope of this research is to develop a hyperstable adaptive control system of a direct current (DC) drive speed for effective load torque attenuation. The proposed speed controller is based on the model reference adaptive control framework and integrated into the conventional DC drive cascade control system. Its main features are as follows: (1) the boundedness of the control action signal, as well as the armature current control loop non-stationarities, are taken into consideration with the help of the reference model hedging technique; (2) its inputs include only measurable signals, thus there is no need to use any kind of state estimators; (3) it attenuates the disturbances, which are matched with its control action signal, particularly, the inertia moment non-stationarity and load torque. The asymptotic hyperstability of the obtained DC drive control system is proven with the help of Lyapunov’s theorems and Popov’s criterion. The numerical experiments corroborate the obtained results. They include the demonstration of disadvantages of the conventional cascade control system under conditions of the drive parameters’ non-stationarity and advantages of the proposed solution for different disturbance types and amplitudes.
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49

Mahdi Darbandi, S., Mehdi Behzad, Hassan Salarieh et Hamid Mehdigholi. « Harmonic disturbance attenuation in a three-pole active magnetic bearing test rig using a modified notch filter ». Journal of Vibration and Control 23, no 5 (9 août 2016) : 770–81. http://dx.doi.org/10.1177/1077546315586494.

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This study is concerned with the problem of harmonic disturbance rejection in active magnetic bearing systems. A modified notch filter is presented to identify both constant and harmonic disturbances caused by sensor runout and mass unbalance. The proposed method can attenuate harmonic displacement and currents at the synchronous frequency and its integer multiples. The reduction of stability is a common problem in adaptive techniques because they alter the original closed-loop system. The main advantage of the proposed method is that it is possible to determine the stability margins of the system by few parameters. The negative phase shift of the modified notch filter can be tuned to achieve a desired phase margin, while the gain margin can also be adjusted separately. It is shown that the modified notch filter can be designed to suppress multiple harmonics at the same time. It is implemented on a three-pole magnetic bearing test rig to evaluate its performance. Simulation and experimental results indicate that the presented method can be successfully applied to compensate the periodic disturbances such as sensor runout and mass unbalance in active magnetic bearing systems.
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50

Ghasem Kazemi, Mohammad, et Mohsen Montazeri. « A New Hybrid Robust Fault Detection of Switching Systems by Combination of Observer and Bond Graph Method ». International Journal of Electrical and Computer Engineering (IJECE) 8, no 4 (1 août 2018) : 2157. http://dx.doi.org/10.11591/ijece.v8i4.pp2157-2171.

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<p>In this paper, the problem of robust Fault Detection (FD) for continuous time switched system is tackled using a hybrid approach by combination of a switching observer and Bond Graph (BG) method. The main criteria of an FD system including the fault sensitivity and disturbance attenuation level in the presence of parametric uncertainties are considered in the proposed FD system. In the first stage, an optimal switching observer based on state space representation of the BG model is designed in which simultaneous fault sensitivity and disturbance attenuation level are satisfied using H􀀀=H1 index. In the second stage, the Global Analytical Redundancy Relations (GARRs) of the switching system are derived based on the output estimation error of the observer, which is called Error-based Global Analytical Redundancy Relations (EGARRs). The parametric uncertainties are included in the EGARRs, which define the adaptive thresholds on the residuals. A constant term due to the effect of disturbance is also considered in the thresholds. In fact, a two-stage FD system is proposed wherein some criteria may be considered in each stage. The efficiency of the proposed method is shown for a two-tank system.</p>
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