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This paper investigates the problem of relative control for spacecraft formation flying on an arbitrary elliptical orbit. The nonlinear dynamic model describing the relative motion between the leader spacecraft and the follower spacecraft is established in the presence of system model uncertainty and external disturbance. A continuous finite-time control scheme is designed by using a new form of terminal...
Identifying an accurate model of the stagnation pressure on-line will benefit the design of the controller and improve the quality of the wind tunnel experiments. This paper focuses on the recursive identification of the stagnation pressure in the wind tunnel system. Based on the study of the aforementioned system structure, the stagnation pressure system is expressed by a block oriented model with...
A cart-pendulum system has two degrees of freedom (DOF) and has only one control input. It is a well known example of underactuated nonlinear mechanical system. We analyze the dynamic properties and discuss motion planning for this 2-DOF underactuated system in this paper. First, the mathematical model of the cart-pendulum system is given. And a coordinate transformation is used to change the model...
In this paper, an output regulation problem for multi-agent linear systems is considered. For such a problem, we have proposed a distributed controller design strategy based on composite nonlinear feedback (CNF) control. The composite nonlinear feedback (CNF) control consists of the dynamic state feedback servo-regulator and the nonlinear control part. The dynamic state feedback servo-regulator includes...
In this paper, a derivative Lorenz chaotic system is considered and the stability of equilibrium points and the existence of Hopf bifurcation are investigated by center manifold theorem and normal form theory. Besides, we designed a washout controller such that the derivative Lorenz chaotic system undergoes a controllable Hopf bifurcation. By the calculation of the first Lyapunov coefficient and adjust...
In this paper, the active disturbance rejection control (ADRC) approach is applied to output-feedback stabilization for a class of uncertain multi-input multi-output (MIMO) nonlinear systems with stochastic inverse dynamics and stochastic disturbance. We first design an extended state observer (ESO) to estimate both unmeasured states and stochastic total disturbance which includes unknown system dynamics,...
In this paper, generation of a class of multidirectional saturated chaotic attractors is investigated based on coupled Chua's circuits. The Caputo derivative definition is employed to describe the fractional-order multi-scroll dynamic systems, and a fractional-order chaotic system with 6×6×6×6×6×6 and 9×9×9×9×9×9 grid scroll chaotic attractors are obtained. Simulation results are presented to show...
This paper considers the filtering problem for a class of nonlinear uncertain systems with process and measurement noise. An extended state based H∞ filter, with the idea of timely estimating the unknown dynamics, is proposed for better robustness and higher estimation precision. We prove the stability of the proposed filter for a class of nonlinear uncertain systems with the initial estimation error,...
Modeling and control design are carried out for a kind of morphing wings with distributed structures. By using the theory of analytical mechanics, the dynamic model of the morphing wing is constructed. Based on the nonlinear dynamic model, a feedback linearization controller and a sliding mode controller with filter are designed respectively. System stability is analyzed for both control approaches...
In web-winding systems, precise regulation of web tensions is critical. Generally, most tension control strategies are sensor-based control, which relies on precise measurement of the tensions. However, measuring devices such as load cells or swing rolls are expensive, require either special or extra rolls, add system complexity and reduce system reliability. In this paper, two nonlinear tension observers...
this paper presents a disturbance rejection control methodology for the course keeping of a fully-submerged hydrofoil craft. The course keeping dynamics of the fully-submerged hydrofoil craft with parameter perturbation is firstly analyzed. Then an extended disturbance observer (EDO) is developed to make real time estimate of the disturbance as well as the model uncertainties. A nonsingular terminal...
Using dynamic surface control method, an adaptive output feedback prescribed performance tracking control scheme is proposed for a class of uncertain nonlinear systems with input unmodeled dynamics and dead-zone in this paper. Reduced-order K-filters are designed to observe unmeasured states. Input dead-zone characteristic is considered on the basis of the control input having unmodeled dynamics....
This paper addresses the problem of estimating states and parameters of chaotic memristive systems with single measurable variable. Based on the conventional extended Kalman filter, we present two new strategies based on the joint extended Kalman filter and dual extended Kalman filter. Then, the two kinds of filters are employed to estimate the states and parameters of chaotic memristive systems....
Piezoelectric actuator has been frequently utilized in the micromanipulation control. However, the rate-dependent hysteresis properties in the actuator affect severely the high precision tracking control. In this study, a Hammerstein-based model with Bouc-Wen hysteresis nonlinearity is proposed to describe the dynamic characteristics of rate-dependent hysteresis in a piezoelectric actuator. The Bouc-Wen...
An improved included angle division method is proposed for Hammerstein systems. In this division method, nonlinearity of the system is taken into account to distribute gridding points, so distribution is more reasonable and computation load in division is reduced greatly. Based on the division result, a multimodel predictive controller is designed to overcome the drawbacks of the common nonlinearity...
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