The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In order to ensure the accuracy of course control and achieve good performance on roll stabilization, this paper designs rudder/fm joint SMC system, thereby improving ship's course stability, security and comfort of crew and passenger. Aiming at ship motion with the features of nonlinearity, strong coupling, multivariable and complex sea condition, this paper establishes the ship motion mathematical...
The importance of carrier-based landing has been a controversial topic. The wave excites the ship to make six-degree-of-freedom motion, accompanied by atmosphere turbulence flow and ship airwake, making the carrier-based aircraft landing a great challenge. Aimed to ensure the safety of carrier-based aircraft and precision landing, a method of the constrained command filtered prescribed performance...
This paper is concerned with the problem of adaptive fuzzy output feedback control for a class of nonlinear pure-feedback systems with full state constraints. Because the systems have immeasurable states, the fuzzy state observers are designed to estimate the unmeasured states with the help of fuzzy logic systems to approximate the unknown nonlinear functions. A fuzzy adaptive output feedback control...
This paper studies the sampled-data control problem for a class of nonlinear systems. A multi-rate digital controller is designed by combining the input-Lyapunov matching approach and the multi-rate approach. The proposed control scheme ensures the stability of the closed-loop sampled-data system. Compared with emulated strategies, our controller has the form of series in power of sampling period,...
In this paper, we study the output feedback tracking control problem of omni-directional robots. Firstly, we construct an observer to estimate the value of unknown orientation of the robot through switching and event triggering strategies. Compared to present works, the velocity of the robot is only required persistently exciting, and hence can go through zero, meanwhile, the acceleration measurement...
This paper deals with the tracking control problem of uncertain transmission systems in the presence of elastic deadzone. Due to the derivative term in the elastic deadzone model, it is not straightforward to apply the backstepping control for the elastic system which is not in strict feedback form. To overcome this limitation, the system is first transformed into two cascaded subsystems and an adaptive...
In this paper, a novel control scheme is proposed for quadrotor unmanned aerial vehicle (UAV) transportation systems. The proposed control law successfully achieves efficient quadrotor transferring and rapid swing elimination simultaneously. Specially, by analyzing the interconnected form of the system, the virtual control input for the outer loop is constructed via an energy-based analysis method,...
On account of the finite propagation speed of signals, time-delay phenomena are abundant. Compared with time-delay systems, nonlinear systems with generalized piecewise constant arguments can be both of advance and retard, which are an extension to time-delay systems. In this paper, we address the robustness of global exponential stability for a general class of nonlinear systems with generalized...
In this paper, the problem of finite-time stabilization for a class of memristor-based neural networks with time-varying delays is investigated by using hybrid impulsive and nonlinear feedback controllers. Based on the theory of the differential equations with discontinuous right and Lyapunov function approach, several sufficient conditions are derived to guarantee the finite-time stabilization of...
In this paper, we propose an adaptive stabilizer to solve the stability problem of single inverted pendulum system. The stabilizer, which consists of a nested saturation feedback controller and a logic-based online-tuning mechanism, is designed for a class of nonlinear feed-forward systems. The function of the online-tuning mechanism is to adjust the level of saturation in the controller according...
The finite-time tracking control for reusable launch vehicle with matched disturbance is investigated. An adaptive-multivariable controller is proposed where the bounds of the perturbations are not known. A proof of the finite-time convergence of the closed-loop system is derived using the Lyapunov technique. The feature of the proposed control scheme is that it does not require any information on...
We consider the problem of measurement feedback controller design for a class of feedforward nonlinear systems with zero-dynamics and uncertain control coefficient. The sensor noise can be any bounded signal whose bound is finite. For design convenience, a state transformation is first introduced and the new system is obtained. Then, a measurement feedback controller is proposed with a suitable gain...
In this paper, we present a Carrier-Based Aircraft Approach Power Compensator System based on L1 adaptive controller. A nonlinear dynamic inversion controller serves as the baseline controller for this architecture as command inputs. Then the baseline controller is augmented with an L1 adaptive controller to cancel out the uncertainties. The main advantage of the new approach is its ability of fast...
State of Charge (SOC) estimation has always been a key issue in the Battery Management System (BMS). This paper proposes a simple modified Luenberger observer to estimate the state of charge of the lithium-ion battery. Nonlinearity of battery equivalent circuit model is approximated at each step. Simulation results show that this simple modified Luenberger observer achieves satisfactory estimation...
Modeling and control methods for systems with dynamic hysteresis are proposed in this paper based on a type of Hammerstein models. Experiments are conducted on a typical dynamic hysteresis system, i.e., a giant magnetostrictive actuator. The modeling, real-time tracking, and real-time active vibration control results are presented. These results verify the effectiveness and accuracy of the modeling...
This paper considers the consensus control problem for a class of non-holonomic chained systems. A smooth static distributed control algorithm is proposed with the aid of the Lyapunov direct method and LaSalle invariance principle. Strict stability analysis for the closed-loop system is presented, proving the global asymptotic convergence of the consensus errors to zero under the undirected connected...
Direct Drive Volume Control (DDVC) flange-type rotary vane steering gear is a greatly promising component to be applied in the controlling course and posture of vessel due to the superior advantages of compact structure, powerful vibration absorption, simple control and etc. However, the nonlinear friction is a main limit for DDVC flange-type rotary vane steering gear to meat the accuracy requirement...
This paper investigates the finite-time lag synchronization of the master-slave Chua's circuit systems with time delay via a variable-substitution and sinusoidal feedback controller. Employing the finite-time stability theory, some finite-time synchronization criteria for the variable-substitution and sinusoidal feedback controller are analytically proven and the corresponding synchronization time...
In this paper, precise tracking control of a class of high-order hydraulic servo systems is studied, where the dynamics of the electrohydraulic actuator are considered. Different to available results, a new control method is proposed without using the backstepping scheme and any function approximators. The model of the hydraulic servo system is transformed into a Brunovsky form, so that the tracking...
In this paper, the take-off trajectory optimization problem for a new vertical takeoff and landing(VTOL) unmanned aerial vehicle(UAV) is studied. The longitudinal kinematics equation and dynamics equation are established with atmospheric density, earth gravity, engine thrust and aerodynamic parameter. Taking the thrust and rudder angles as the control variables, the optimal objective function of the...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.