A controller which solves the controller "reset windup problem" for the multivariable servomechanism problem with unmeasurable constant disturbances, using a switching adaptive controller, is proposed: an ad...
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ISBN:
(纸本)9783952426906
A controller which solves the controller "reset windup problem" for the multivariable servomechanism problem with unmeasurable constant disturbances, using a switching adaptive controller, is proposed: an advantage of the controller is that no mathematical model of the plant is required in order to implement it. Real time experimental results of this controller when applied to a multivariable system are given.
This paper is concerned with invariant systems on Lie groups. A sufficient condition for a piecewise constant input to distinguish between any two distinct initial states contained in some open neighbourhood of the st...
This paper is concerned with invariant systems on Lie groups. A sufficient condition for a piecewise constant input to distinguish between any two distinct initial states contained in some open neighbourhood of the state space is given. This condition involves the parallel translation of vectors along curves thus relating observability to parallelism.
The Charney-Hasegawa-Mima equation, with random forcing at the narrow band wave-number region, which is set to be slightly larger than the characteristic wave number λ, evaluating the inverse ion Larmor radius in pla...
The Charney-Hasegawa-Mima equation, with random forcing at the narrow band wave-number region, which is set to be slightly larger than the characteristic wave number λ, evaluating the inverse ion Larmor radius in plasma, is numerically studied. It is shown that the Fourier spectrum of the potential vorticity fluctuation in the development of turbulence with an initial condition of quiescent state obeys a dynamic scaling law for k≪λ. The dimensional analysis with the assumption that the energy transfer rate ε in the inverse cascade is constant with time leads to the scaling form S(k,t) =λ1/2ε5/4t7/4F(k/k-bar(t))[k-bar(t)∼λ3/4ε−1/8t−3/8] with a scaling function F(x), which turns out to be in good agreement with numerical experiments.
This paper focuses on a modeling approach being investigated for chaotic and stochastic dynamic systems. A novel approach of applying Markov chains to these systems is proposed. Equivalent transformation from the Mark...
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This paper focuses on a modeling approach being investigated for chaotic and stochastic dynamic systems. A novel approach of applying Markov chains to these systems is proposed. Equivalent transformation from the Markov model to a parametric model is also discussed.
Real-time, in situ control of reactive ion etching is shown to reduce loading disturbance in an Applied 8300 reactive ion etch system. The etch process vehicle is CF4 etching of polysilicon. A real-time, multivariable...
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Real-time, in situ control of reactive ion etching is shown to reduce loading disturbance in an Applied 8300 reactive ion etch system. The etch process vehicle is CF4 etching of polysilicon. A real-time, multivariable feedback control strategy where key plasma parameters are fed back has been developed. This strategy is experimentally compared with standard industry practice and is shown to reduce the loading effect by 80%. This quantification of improvement is carried out in terms of a model from the literature which is reviewed and experimentally validated for the etch equipment and process used.
control of a reusable launch vehicle (RLV) is considered in sliding modes. The sliding mode controllers are designed for the RLV in two operational modes: re-entry (descending) mode and launch (ascending) mode. The de...
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In this paper, a surface recovery method using multiresolution wavelet transform is proposed. For representing 3-D surface shapes, 4th order B-spline functions are introduced as scaling functions of spline wavelets. A...
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In this paper, a surface recovery method using multiresolution wavelet transform is proposed. For representing 3-D surface shapes, 4th order B-spline functions are introduced as scaling functions of spline wavelets. A regularization problem is solved in order to estimate the surface function. The estimated surface function can be decomposed into an approximate surface function at specific lower resolution and the corresponding wavelet components by using the multiresolution wavelet transform. Consequently, by reducing the noise components which the wavelet components include, the surface recovery method can give a further accurate estimation of the surface function. Through several experiments, both the robustness to noises and the edge-preserving property in recovering the surface have been attained.
This paper presents a model-based approach to fault detection of dynamic systems, which is robust to unmodeled dynamics. A “Quasi-ARMAX model᾿ is first proposed for describing nonlinear systems by incorporating a gro...
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This paper presents a model-based approach to fault detection of dynamic systems, which is robust to unmodeled dynamics. A “Quasi-ARMAX model᾿ is first proposed for describing nonlinear systems by incorporating a group of certain nonlinear structures into a linear ARMAX structure. The model can be used for a best linear approximation of the system, as well as for the estimation of resulting unmodeled dynamics, by a hierarchical implementation of recursive identification. Then robust fault detection is performed based on thresholding approach using Kullback discrimination information as fault detection index, in which the estimated unmodeled dynamics is incorporated.
This paper describes a binary image representation scheme, which is called image block representation and presents a new skeletonization algorithm, which is implemented on block represented binary images. The main pur...
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This paper describes a binary image representation scheme, which is called image block representation and presents a new skeletonization algorithm, which is implemented on block represented binary images. The main purpose of the image block representation is to provide an efficient binary image representation that permits the execution of operations on image areas instead of image points. The skeletonization algorithm operates in four subiterations: each subiteration deletes the north, the south, the west and the east boundary points, respectively. Due to the substitution of the boundary points by the block's boundary points the relevant operations are performed fast, while preserving the end points and the object connectivity.
In this paper we present a method for image feature extraction using coordinate logic filters. Coordinate logic filters constitute a new kind of nonlinear filter, which are closely related to morphological fillers. Th...
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In this paper we present a method for image feature extraction using coordinate logic filters. Coordinate logic filters constitute a new kind of nonlinear filter, which are closely related to morphological fillers. The key issue to the coordinate logic analysis of images is the methodology of fast successive filtering and managing of the residues. The desired processing is succeeded by executing only direct logic operations among the pixels of the given image. The coordinate logic filters can be easily implemented using logic circuits or cellular automata.
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