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IEEE International Conference on Mechatronics (ICM)

作者： Kuresangsai, Pongsiri Cole, Matthew Chiang Mai Univ Dept Mech Engn Chiang Mai 50200 Thailand

ISBN: (纸本)9781728144429

This paper presents a linear time-varying (LTV) prefilter design for residual vibration suppression in LTV motion systems. As tracking performance can be affected by delay effects from prefiltering, an additional moment constraint is introduced in the prefilter synthesis equations for tracking of constant velocity commands. Inclusion of the moment constraint can result in higher prefilter gain (H-2 norm) which leads to overshoot in the transient response. It is shown how this effect can be reduced by noncausal prefiltering with specified preview time. The LTV-FIR prefilter is applied experimentally to a multi-flexure X-Y motion stage mechanism where the position-dependent dynamics are captured by interpolation of a set of identified LTI models. The experimental results confirm that the prefilter with input preview can reduce settling time and overshoot compared with the causal prefilter, while maintaining good tracking performance.

关键词： motion control linear time varying system vibration filtering

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A Continuous Reconstruction Observer for Sampled-Data linear time varying systems

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IEEE ACCESS 2018年 6卷 17223-17231页

作者： Ali, Rahat Malik, Mohammad Bilal Malik, Fahad Mumtaz Qayyum, Atif Natl Univ Sci & Technol Coll Elect & Mech Engn Dept Elect Engn Islamabad Pakistan

In this paper, a novel continuous sampled-data observer for linear time-varying systems is presented. The proposed observer is based on two different impulsive observers. The state estimates of these impulsive observers are fused in a manner such that continuous state estimation is achieved. Another significant contribution is comprehensive stability analysis of the proposed observer. The analysis establishes conditions that guarantee exponential convergence of observers. Contrary to the common understanding, it is revealed that the convergence of associated discrete-time equation for impulsive observers is not a sufficient condition for overall convergence. Contributions are illustrated by simulations.

关键词： Sampled-data linear time varying system impulsive observer

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Multi Observer Structure for Rapid State Estimation in linear time varying systems

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INTERNATIONAL JOURNAL OF CONTROL AUTOMATION AND systemS 2018年第4期16卷 1746-1755页

作者： Bernat, Jakub Poznan Univ Tech Fac Comp PL-60965 Poznan Poland

A new method to design observers for linear time-varying systems is presented in this paper. The method begins by constructing two layers. The first layer is made up of multiple observers, while the second establishes a relationship between observers via a weighted estimation state. The primary challenge was to find a new feedback process that would determine the second layer weights. The multiple observers of the first layer were investigated to determine a general observation law. The resulting multilayer structure significantly improves the transient characteristics of the observation process, which leads to a more efficient control system.

关键词： linear time varying system multiple Models observer design

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A semi-analytical treatment of xenon oscillations

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ANNALS OF NUCLEAR ENERGY 2017年 106卷 127-135页

作者： Zarei, M. Minuchehr, A. Ghaderi, R. Shahid Beheshti Univ Nucl Engn Dept POB *** Tehran Iran

A novel approach is developed to investigate xenon oscillations within a two-group two-region coupled core reactor model incorporating thermal feedback and poison effects. Group-wise neutronic coupling coefficients between the core regions are calculated applying the associated fundamental and first mode eigenvalue separation values. The resultant nonlinear state space representation of the core behavior is quite suitable for evaluation of reactivity induced power transients such as load following operation. The model however comprises a multi-physics coupling of sub-systems with extremely distant relaxation times whose stiffness treatment inquire costly multistep implicit numerical methods. An adiabatic treatment of the sluggish poison dynamics is therefore proposed as a way out. The approach helps further investigate the nonlinear system within a linear time varying (LW) framework whereby a semi analytical framework is established. This scheme incorporates a matrix exponential analytical solution of the perturbed system as a quite efficient tool to study load following operation and control purposes. Poison dynamics are updated within larger intervals which exclude the need for specific numerical schemes of stiff systems. Simulation results of the axial offset conducted on a WER-1000 reactor at the beginning (BOC) and the end of cycle (EOC) display quite acceptable results compared with available benchmarks. The LTV reactor model is further investigated within a stability analysis of the associated time varying systems at these two stages employing the concept of Lyapunov exponent (C) 2017 Elsevier Ltd. All rights reserved.

关键词： Coupled core kinetics Xenon oscillations Stiffness Adiabatic approximation Matrix exponential linear time varying system Lyapunov exponent

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A Modified Haar Wavelet Based Approach for State Analysis of A Pendulum Problem 2

A Modified Haar Wavelet Based Approach for State Analysis of...

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2nd IEEE International Innovative Applications of Computational Intelligence on Power, Energy and Controls with their Impact on Humanity (CIPECH)

作者： Sheetal Mittal, Monika KIET EN Dept Ghaziabad India NIT Elect Dept Kurukshetra Haryana India

ISBN: (纸本)9781467390804

In this paper, the state analysis of a pendulum problem via a modified Haar wavelet based approach is presented. Based upon some useful properties of Haar functions like operational matrix of integration, a special product matrix and a related coefficient matrix, problem of a pendulum is solved. Computational savings achieved with the modified method as compared to existing Hsiao method have been demonstrated using MATLAB PROFILER for different resolutions.

关键词： connection coefficients linear time varying system operational matrices Haar wavelet

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Experimental Results of Trajectory Tracking Control of Robot Manipulator using time varying Sliding Mode Controller 13

Experimental Results of Trajectory Tracking Control of Robot...

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13th International Conference on Informatics in Control, Automation and Robotics (ICINCO)

作者： Mutoh, Yasuhiko Kogure, Nao Sophia Univ Dept Engn & Appl Sci Chiyoda Ku 7-1 Kioicho Tokyo Japan

ISBN: (纸本)9789897581984

The author et al. proposed the design method of the sliding mode controller for the trajectory tracking control problem of nonlinear systems. This controller consists of the conventional sliding mode control and the pole placement controller for the the linear time varying approximate model of the nonlinear system around the desired trajectory. In this paper, this controller is applied to the trajectory tracking control of the actual 2-link robot manipulator, and, experimental results are shown.

关键词： Sliding Mode Control time-varying Pole Placement Control Trajectory Tracking Control Nonlinear system linear time varying system

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A Modified Haar Wavelet Based Approach for State Analysis of A Pendulum Problem

A Modified Haar Wavelet Based Approach for State Analysis of...

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International Conference on systems in Medicine and Biology (ICSMB)

作者： Sheetal Mittal, Monika KIET EN Dept Ghaziabad India NIT Kurukshetra Elect Dept Kurukshetra Haryana India

ISBN: (纸本)9781467376662

关键词： connection coefficients linear time varying system operational matrices Haar wavelet

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Design of Autonomous Cruise Controller with linear time varying Model

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JOURNAL OF ELECTRICAL ENGINEERING & TECHNOLOGY 2015年第5期10卷 2162-2169页

作者： Chang, Hyuk-Jun Yoon, Tae Kyun Lee, Hwi Chan Yoon, Myung Joon Moon, Chanwoo Ahn, Hyun-Sik Kookmin Univ Sch Elect Engn Seoul South Korea

Cruise control is a technology for automatically maintaining a steady speed of vehicle as set by the driver via controlling throttle valve and brake of vehicle. In this paper we investigate cruise controller design method with consideration for distance to vehicle ahead. We employ linear time varying (LTV) model to describe longitudinal vehicle dynamic motion. With this LTV system we approximately model the nonlinear dynamics of vehicle speed by frequent update of the system parameters. In addition we reformulate the LTV system by transforming distance to leading vehicle into variation of system parameters of the model. Note that in conventional control problem formulation this distance is considered as disturbance which should be rejected. Consequently a controller can be designed by pole placement at each instance of parameter update, based on the linear model with the present system parameters. The validity of this design method is examined by simulation study.

关键词： Autonomous cruise control Adaptive cruise control linear parameter varying system linear time varying system

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L1 Adaptive Control Augmentation for a Hypersonic Glider

L1 Adaptive Control Augmentation for a Hypersonic Glider

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作者： Sanchito Banerjee The University of Queensland

学位级别：博士

The aim of this research is to investigate control strategies to carry out a pull out of a ballistic trajectory (initially the same as the sub-orbital ballistic HyShot and HIFiRE trajectories) and a pulsed roll angle bank manoeuvre for a hypersonic glider. This study investigates the performance of two different control methodologies in the presence of aerodynamic, gravimetric and actuator uncertainties: pole placement control (PPC) (as the baseline) and adaptive control (to augment the PPC). Through simulations, it is shown that the PPC carries out the pull up manoeuvre (by tracking the flight path angle, ) on a scaled Generic Hypersonic Aerodynamics Model Example (GHAME model). Once the pull-up manoeuvre is carried out the lateral/directional PPCs perform satisfactorily in tracking the commanded roll angle, and maintaining a sideslip angle,, of zero degrees. The PPCs presented are all Single Input Single Output (SISO) controllers. Pole-zero plots are utilised to highlight the stability properties of the PPC. All the controllers are stable. The differences in the performance and robustness for the various uncertainty cases are highlighted through the tracking error norm and the time delay margin (TDM). The performance of the PPC significantly worsens in the presence of uncertainties. This deterioration is quantified using tracking error norms, error dynamics acceleration and a control surface metric. adaptive control is employed as a control strategy to augment the PPC as it allows the decoupling of the control and the estimation loop. The control augmentation design is employed for both the longitudinal and the lateral/directional channels in the presence of matched and unmatched uncertainties. A piecewise constant adaptive law (to estimate the uncertainties) is adopted for all the channels. An additional challenge present in this research is that the flight path angle dynamics of the system display non-minimum phase behaviour. The control theory requires the inve

关键词： Hypersonic glider flight control pole placement control adaptive control longitudinal and lateral/directional control descent trajectory adaptive augmented controller nonminimum phase system linear time varying system full state feedback control timedelay margin

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Singularly perturbed implicit control law for linear time varying SISO systems

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INTERNATIONAL JOURNAL OF ROBUST AND NONlinear CONTROL 2014年第10期24卷 1530-1549页

作者： Puga, S. Bonilla, M. Malabre, M. Lozano, R. UPIITA IPN Acad Sistemas Mexico City 07340 DF Mexico CINVESTAV IPN CINVESTAV CNRS UMI 3175 Mexico City 07000 DF Mexico LUNAM Univ CNRS IRCCyN UMR CNRS 6597 F-44321 Nantes France Heudiasyc UMR UTC CNRS F-7253 Compiegne France

This paper considers the problem of stabilizing a single-input single-output linear time varying system using a low order controller and a reference model. The closed loop is a linear singularly perturbed system with uniform asymptotic stability behavior. We calculate bounds epsilon is an element of (0,epsilon( * )) as in Kokotovic's book, such that the uniform asymptotic stability of the singularly perturbed system is guaranteed. We show how to design a control law such that the system dynamics is assigned by a Hurwitz polynomial with constant coefficients. Copyright (c) 2013 John Wiley & Sons, Ltd.

关键词： high gain observer implicit perturbed control law uniform asymptotic stability linear time varying system singularly perturbed system

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