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Presents the introductory welcome message from the conference proceedings. May include the conference officers' congratulations to all involved with the conference event and publication of the proceedings record.
The stability of filters for nonlinear dynamic systems with Lipschitz nonlinearities is addressed. By considering the disturbances in the system and measurement equations as the inputs to the system representing the estimation error dynamics, the input-output stability of the filtering mapping associated with the estimation error dynamics is introduced. This is done with respect to signals belonging...
A new model class is proposed to use for identification purposes, which is able to approximate many nonlinear systems quite accurately. Conditions are given for the system to be representable by a linear-in-parameters equation, which allows to use effective linear methods to solve the identification problem. Finally an example is provided to illustrate the use of the proposed model class for identification...
It is widely accepted that human error is a major contributing factor in aircraft accidents. The early detection of a subsystem abnormality that is developing during flight is potentially important, because the extra time before an alert range is reached may improve the crew's situation awareness. The flight crew may thus consider and try more options for dealing with the failure situation. Techniques...
A new concept for nonlinear differential games on Lie groups is presented. This concept is a direct generalization of several topics, including right-invariant control systems on Lie groups, geodesic variational problems and of course linear-quadratic differential games on IRn. Besides introducing several definitions for games with and without boundary value problems, we discuss the well-posedness...
Previously, a nonlinear passivity control has been proposed for a discrete-time (neutrally) stable bilinear system. However, the decay rate of the closed-loop system is not exponential. In this paper, a new nonlinear control is suggested to achieve exponential decay rate. It is also shown that the new control is robust against small parametric uncertainties.
The paper suggests a solution to the constrained control problem in a certain closed-loop iterative controller refinement scheme. In contrast to the general philosophy-design a linear controller and add an anti-windup compensator —, this paper attempts to provide a simple solution based on the ideal design paradigm: design such a controller that the controller output does not violate its limitations...
The simple Hammerstein and Wiener type block-oriented nonlinear models proved to be easy to handle in several identification and control schemes. The paper extends the generic two-degree of freedom controller scheme and the K-B-parametrization introduced for linear plants to these factorable nonlinear processes. Simulation examples are shown to present the efficiency of the new scheme and design formulas.
This paper analyzes the amplitude dependent behavior of nonlinear sampled-data control systems in a frequency domain. We apply the robust stability condition for nonlinear discrete-time feedback systems (which was derived in our previous papers) to a sampled-data control system containing a single nonlinear element in the forward path. In addition, we derive an instability condition for that type...
In this paper, we study the applicability of two algorithms to Smith predictor dead time compensation. The first algorithm is Iterative Feedback Tuning (IFT), a model free gradient descent controller tuning tool. Refer to [1, 2] for further details. The second algorithm is Closed-Loop Output Error (CLOE) identification. This identification algorithm minimizes the difference between the achieved closed-loop...
A modeling and control method for a class of nonlinear systems whose working-point varies with some process variable are presented. Based on two global NARMAX (nonlinear ARMAX) models, called the ExpARMAX (exponential ARMAX) models, a multi-step predictive control algorithm without resorting to on-line parameter estimation for the nonlinear systems are proposed. The one of the models is used as the...
In this paper, the author proposes an algorithm of dual predictive control for a system expressed by a linear ARX (auto-regressive and exogenous) model with uncertain plant model parameters. Previously, the author proposed a dual predictive control algorithm which first considered the uncertainties in future control input values and in future output values included in an ARX model. The future input...
An experimental application of a state-space predictive controller is presented. The controller is used for low-level control of a gas conditioning unit, an integrating process with two inputs and two outputs, in a real-life environment. An original approach to the tuning of the controller's feedback action for efficient disturbance rejection performance and robustness is introduced. Feedback action...
In this paper the optimal nonlinear predictive control in cascaded structure design of induction motors is presented which provides global asymptotic tracking of smooth speed and flux trajectories. The controller is based on a finite horizon continuous time minimization of nonlinear predicted tracking errors. With full state measurement assumption, the robustness properties with respect to electrical...
This paper introduces a novel quadratic programming algorithm which will often converge to the optimal point in at most n iterations, when there are n degrees of freedom. Following a description of the algorithm and an efficient implementation, some comparisons are made with the more conventional active set method.
This paper presents an identification procedure of an acoustic noise model for local sound control purposes. The microphone sensor was placed near the loudspeaker, in a way that ensures robustness and stability of the plant, making possible to verify the influence of the zone of quiet in the performance of the control design. The obtained data represents a nonlinear dynamic system, due to the actuator,...
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