The generation of chaos by a linear system with nonlinear feedback has been studied by many researchers. In this paper, a chaotic system using `Relay' as nonlinear feedback element is presented. The system is easi...
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The generation of chaos by a linear system with nonlinear feedback has been studied by many researchers. In this paper, a chaotic system using `Relay' as nonlinear feedback element is presented. The system is easily analyzed by means of the describing function approach, which gives parameter condition leading to chaotic motion. By the bilinear transformation, the proposed system is also shown to be transformed into Brockett proposed chaotic system with piecewise-linear feedback element.
We consider an integrated design problem of structural and controlsystems. Using reduced-order H∞ controller design method proposed by Mustafa and Glover, we formulate the integrated design as a simultaneous design ...
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We consider an integrated design problem of structural and controlsystems. Using reduced-order H∞ controller design method proposed by Mustafa and Glover, we formulate the integrated design as a simultaneous design of the structural design parameter and the reduced order H∞ controller. The formulated problem does not need to take an iterative procedure (controller synthesis and structural modification) which is employed in most integrated design.
In this paper, system identification of semiconductor exposure apparatus is discussed. It has a multi-degrees-of-freedom mechanism which includes anti-vibration units for microvibration control. A dynamical model of t...
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In this paper, system identification of semiconductor exposure apparatus is discussed. It has a multi-degrees-of-freedom mechanism which includes anti-vibration units for microvibration control. A dynamical model of the mechanism is necessary in order to design the microvibration controller. The model is practically constructed in a short time using subspace method. Identification results are evaluated through experimental data in comparison with conventional frequency response method.
A strategy for detecting control law calculation errors in critical flight controlcomputers during laboratory validation testing is presented. This paper addresses Part I of the detection strategy which involves the ...
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A strategy for detecting control law calculation errors in critical flight controlcomputers during laboratory validation testing is presented. This paper addresses Part I of the detection strategy which involves the use of modeling of the aircraft control laws and the design of Kalman filters to predict the correct control commands. Part II of the strategy which involves the use of the predicted control commands to detect control command errors is presented in the companion paper.
This paper shows, by a numerical example, that there is a certain separation property in the design of mechanical controlsystems. In particular, we point out that the control bandwidth of a servo-tracking system, ach...
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This paper shows, by a numerical example, that there is a certain separation property in the design of mechanical controlsystems. In particular, we point out that the control bandwidth of a servo-tracking system, achievable by a dynamic output feedback controller with reasonable amount of control effort, is closely related to the frequency range where the open-loop transfer function exhibits positive-realness. A finite frequency positive-real property is characterized in terms of linear matrix inequalities. Finally, a systematic procedure for designing a mechanical system having such property is proposed, utilizing powerful convex programming techniques.
In this paper, we propose a design method of an output feedback-based adaptive model output following controlsystem based on backstepping strategy for MIMO plants. It is shown that the proposed adaptive control syste...
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In this paper, we propose a design method of an output feedback-based adaptive model output following controlsystem based on backstepping strategy for MIMO plants. It is shown that the proposed adaptive controlsystem has robustness with regard to output-dependent disturbances. Further, the proposed adaptive control method is applied to the parallel inverted pendulums with output-dependent disturbances and the effectiveness of the controlsystem is confirmed through experiments.
While variable speed operation of wind turbines has several advantages, it poses difficult challenges to the design of controlsystem. The purpose of this work is to present a nonlinear variable speed control method f...
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While variable speed operation of wind turbines has several advantages, it poses difficult challenges to the design of controlsystem. The purpose of this work is to present a nonlinear variable speed control method for wind turbines. This method is based on the regulation of excitation winding voltage of the generator. Based on both mechanical and electrical dynamics, a nonlinear control algorithm is derived which is able to achieve smooth and asymptotic rotor speed tracking. The effectiveness of the method is verified via computer simulation with varying operating conditions.
The possibility of looperless rolling in finishing mill of hot rolling process is studied. The performance of controlsystem with the compensator designed by μ synthesis considering parameter perturbation is better t...
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The possibility of looperless rolling in finishing mill of hot rolling process is studied. The performance of controlsystem with the compensator designed by μ synthesis considering parameter perturbation is better than that with the compensator designed by H∞. In order to realize the looperless rolling, the effect of noise of measured variable and the way to reduce the order of compensator must be considered.
The building automation and control network (BACnet) standard defines all the elements of communication between devices, from the abstract language of the objects and services right down to the physical local area net...
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The building automation and control network (BACnet) standard defines all the elements of communication between devices, from the abstract language of the objects and services right down to the physical local area networks (LAN). With its adoption as an ANSI standard and the interest shown worldwide, BACnet points the way to the future of communication within building automation controls.
A simple method for the diagnosis of oscillations in process control loops is presented. The new method is based on the cross-correlation between control variable and loop output and it is shown to correctly diagnose ...
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A simple method for the diagnosis of oscillations in process control loops is presented. The new method is based on the cross-correlation between control variable and loop output and it is shown to correctly diagnose the two most important reasons for oscillations in control loops in the process industry, namely external oscillating disturbances and static friction (stiction) in control valves.
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