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.
The following topics are dealt with: adaptive control; stability and control of time-delay systems; aerospace applications; agent networks; filtering and observer design; stability and control of hybrid and singular systems; networked control systems; tracking; stability of delay systems; UAVs and flight control; agents and autonomous systems; estimation; linear matrix equality methods; control over...
An adaptive feedback control method is presented for the speed control problem of internal combustion engines. It is shown that for the mean-value engine model with the intake-to-power delay, the proposed feedback speed controller satisfies the design objective, and a simplified extension for the control design with adaptive control action is shown to be effective in accounting for uncertain system...
A new paradigm of digital signal processing has recently been proposed in view of sampled-data control theory. This filter, called sampled-data H∞ filter, approximates a linear phase characteristic in continuous-time domain, that is, a pure delay. By this property, we propose a new repetitive controller including the sampled-data H∞ optimal filter. Moreover, to achieve the stability, we introduce...
In this paper, the problem of Hinfin control for a class of Markov jump linear system (MJLS) with timevarying transition rates (TRs) is investigated. The time-varying character of TRs is considered as finite piecewise homogeneous and the variations of TR matrices in the finite set are considered as two types: arbitrary variation and stochastic variation. The latter means that the variations are subject...
This paper aims to design an innovative observerbased reliable controller for networked control system(NCS). The state and sensor failures are estimated as the controller's input. The gains of Observer and observer-based feedback controller are solved via the linear matrix inequality (LMI) technology. An illustrative example is given to show the reliable output can works well even if the sensor failures...
In Networked Control Systems, delays are unavoidable. Moreover, loss of data should be taken into account. Smith-like predictor is the most common approach to cope with delays, but open loop stability is required to ensure internal stability. Some recent results allow dealing with these systems, if a SISO structure is concerned. In this paper, the design of a predictor-observer for possible unstable...
This paper proposes a new control method for a weigh feeder. A weigh feeder has been widely employed in industry because it can dispense powder at a specified rate or amount. The proposed controller is mainly divided into a feed-forward and a feedback compensators. In order to obtain a simple controller, the former gives a steady-state control input designed using a nominal plant gain, and the latter...
In this paper, two robust adaptive control schemes are proposed for a class of uncertain nonlinear systems in a Brunovsky form with unknown dead-zone and sector nonlinearity. The design is based on the principle of sliding mode control and the use of Nussbaum-type function in solving the problem of the completely unknown control gain. The novel description of input nonlinearity which makes the control...
Most of the adaptive optics (AO) system can be considered as a feedback loop that involves both discrete-time and continuous-time signals. Atmospheric turbulence is major obstacle to achieve high-resolution imaging of object since telescopes were invented. To achieve high-resolution imaging of targets in space, it is of key importance to reduce the effects of atmospheric turbulence by operating a...
The design of a robust two-degree-of-freedom (2-DOF) controller for a flight motion simulator is presented. Considering the load variation, torque disturbance, high-frequency mechanical resonance, input saturation and tracking precision, the controller is designed including a feedback controller and a feedforward controller to satisfy robust stability and robust performance simultaneously. The computation...
Despinning the front end of a spinning flying munition is an important step towards flight control of said vehicle. A counter-rotation control scheme is proposed to despin and stabilize the front end of the vehicle at a definable still roll position with respect to earth. Classical and Hinfin control theories are employed to construct the despin controller.
In this paper, we discuss multi-agent formation problems with considering the environmental influence. The autonomous agents are moving in a bounded region, and the environment in the region influences the multi-agent systems with designed potential functions. The steady-state formation of the agents is affected by these artificial potential functions. As the number, positions, and potential function...
In this paper, we study finite-length signal reconstruction over a finite-rate noiseless channel. We allow the class of signals to belong to a bounded ellipsoid and derive a universal lower bound on a worst-case reconstruction error. We then compute upper bounds on the error that arise from different coding schemes and under different causality assumptions. We then map our general reconstruction problem...
The primary focus of this work is to design and implement a robust automatic flight control system for a smallscale unmanned helicopter. A comprehensive nonlinear model for the unmanned system, which is constructed by our research team at the National University of Singapore, is first derived and presented. Based on its linearized model, a robust automatic flight control system is then designed by...
Nowadays congestion control problem of the intermediate nodes in the Internet has received extensively attention in networking and control community. In this paper, a novel adaptive PID (Proportional-Integral-Differential) controller based on neural networks for the problem of AQM with ECN marks is presented. Considering a previously developed nonlinear dynamic model of TCP/AQM system and the queue...
A neuro-fuzzy adaptive control approach for nonlinear dynamical systems, which are coupled with unknown dynamics, modeling errors, and various sorts of disturbances, is proposed and used to design a wheel slip regulating controller. The implemented control structure consists of a conventional controller and a neuro-fuzzy network-based feedback controller. The former is provided both to guarantee global...
This paper is concerned with H∞ control problems for a class of uncertain nonlinear systems. In the procedure, neural networks (NNs) are used to model the nonlinear functions, H∞ tracking controller is derived based on Lyapunov function and the notion of dissipativeness. The controller can not only guarantee the stability of the overall control system, but also attenuate the effect of both the external...
Feedback controllers that automatically counteract the effects of adversarial interventions on the operation of asynchronous sequential machines are considered. Bursts - fast outbursts of characters generated by the controlled machine during transitions - are employed to broaden the conditions under which such controllers exist. Included are necessary and sufficient conditions for the existence of...
Purity evolution under a constant (Continuous-Wave) control field was investigated in this paper. It is shown that a resonant field has a decoupling effect, under which the purity fluctuation of the system states could be restricted in a certain range or even be eliminated. Quantum system numerical simulation experiments were given to demonstrate the properties of the purity and the effect of the...
Networked control system (NCS) is a newly emerging topic within control theory community. In this paper we pay particular attention to the problem concerning data rate constraint. Motivated by many successful results in related research, we study the lowest data rate needed to stabilize an LTI system when the controller structure is limited to be a static state feedback and the channel is modeled...
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.