共查询到20条相似文献,搜索用时 15 毫秒
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The stabilization of a class of switched nonlinear systems is investigated in the paper. The systems concerned are of (generalized) switched Byrnes-Isidori canonical form, which has all switched models in (generalized) Byrnes- Isidori canonical form. First, a stability result of switched systems is obtained. Then it is used to solve the stabilization problem of the switched nonlinear control systems. In addition, necessary and sufficient conditions are obtained for a switched affine nonlinear system to be feedback equivalent to (generalized) switched Byrnes-Isidori canonical systems are presented. Finally, as an application the stability of switched lorenz systems is investigated. 相似文献
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By MARTIN SCHETZEN 《International journal of control》2013,86(5):401-414
A problem in the practical application of the Volterra series to nonlinear theory is the synthesis of systems with a given set of Volterra kernels. In this article we present a method of determining whether a given Volterra kernel can be synthesized exactly by using only a finite number of multipliers. A method for the synthesis of such kernels is also presented. The use of the techniques discussed here is illustrated by examples. 相似文献
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A simple abstract model of Eiffel is introduced,and its denotational semantics is defined using VDM style.A static analysis approach is presented to treat multiple inheritance and renaming mechanism.Within the framework of denotational semantics introduced in this paper,the key features of Eiffel,such as identification,classification,multiple inheritance,polymorphism and dynamic binding,can be adequately characterized. 相似文献
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We present an approach for generating a sort of fractal graphs by a simple probabilistic logic neuron network and show that the graphs can be represented by a set of compressed codings.An algorithm for quickly finding the codings,i.e.,recognizing the corresponding graphs,is given.The codings are shown to be optimal.The results above possibly give us the clue for studying image compression and pattern recognition. 相似文献
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HAROLD R. DESSAU 《International journal of control》2013,86(2):367-375
A technique is described for the closed-loop control of a class of non-linear systems iii a potentially large neighbourhood of a nominal trajectory. By the introduction of extra states it is shown how to reduce non-linear differential equations to a related canonical linear form. Since the linear form is not readily amenable to standard design techniques a new synthesis procedure is proposed for the construction of a closed-loop control. The proposed technique relies heavily on computer computation. The computation for the closed-loop control of a lifting body, a system not completely controllable, is given in detail to illustrate the applicability of the method. 相似文献
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L.C. Félix-Herrán J. de J. Rodríguez-Ortiz R. Soto R. Ramírez-Mendoza 《International journal of control》2013,86(8):1026-1038
This research work presents an H ∞ controller based on a Takagi–Sugeno (T–S) fuzzy model for a two-degrees-of-freedom (2-DOF) one-quarter-vehicle semi-active suspension with a magnetorheological damper where the actuator dynamics are included in the control synthesis. These dynamics enclose nonlinear damper phenomena, avoided in many other studies, and that can improve the suspension system by means of a more accurate model. The objective is to obtain a semi-active suspension that considerably improves the passive suspension efficiency based on some frequency domain performance criteria. The advantage of having the T–S system as a reference is that each piecewise linear system can be exposed to the well-known control theory. Besides, the proposed solution is compared with the recent reported work to highlight its advantages. A case of study is included and simulation work supports the results. The methodology applied herein can be extended to a half-vehicle model, and to the four wheels to have a global chassis control in order to maximise passenger comfort and vehicle stability. 相似文献
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The trajectory of a cylindrical particle driven by electrophoresis was transiently simulated as the particle moves through
a 90° corner. A variety of system parameters were tested to determine their impact on the particle motion. The zeta potential,
channel width, and particle aspect ratio were shown to have a minimal effect on the particle motion. Conversely, the initial
vertical position of the particle and initial angle with respect to the horizontal had a significant impact on the particle
motion. The presence of the 90° corner acts to reduce the initial distribution of angles to the vertical of 90° to less than
30°, demonstrating the possibility of using a corner as a passive control element as part of a larger microfluidic system.
However, the reduction in angle is limited to the area near the corner posing a limitation on this means of control. 相似文献
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ARILD THOWSEN 《International journal of systems science》2013,44(12):1485-1492
Sufficient conditions for memoryless feedback stabilization of linear time-invariant delay systems are derived. Conditions for this class of system to be stabilized with any desired stability degree are also determined. 相似文献
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Li Wusheng Huazhong University of Science Technology Wuhan China Computer Graphics Virtual Reality 《计算机辅助绘图.设计与制造(英文版)》2001,(2)
By the theory of Christopher Alexander, the famous architecture theorist, function of the verge of building and the pattern of its realization are illustrated. The selectable pattern for architecture design and drawing is discussed. 相似文献
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L. I. Timchenko N. I. Kokryatskaya A. A. Yarovyy V. V. Melnikov G. L. Kosenko 《Cybernetics and Systems Analysis》2013,49(5):785-795
This paper presents a prediction method using a parallel–hierarchical (PH) network and hyperbolic smoothing of empirical data. The average prediction error is 0.55% for the developed method and 1.62% for neural networks; therefore, this method is more efficient as applied to real-time systems than traditional neural networks due to the use of the PH network and hyperbolic smoothing in implementing the operation of predicting the positions of energy centers of laser beam spot images for optical communication systems. 相似文献
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MARTIN SCHETZEN 《International journal of control》2013,86(3):251-263
A method of measuring the Volterra kernels of a finite-order non-linear system is presented. The kernels are obtained individually as a multi-dimensional impulse response. The multi-dimensional kernel transforms also can be obtained by the method described. As an extension, a technique of obtaining the Volterra kernels from a multi-dimensional step response is presented. This technique is useful for non-linear systems which can be considered to be of a given finite order for only a limited range of input amplitudes. 相似文献
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In recent years, Internet Protocol (IP) telephony has been a real alternative to the traditional Public Switched Telephone Networks (PSTN). IP telephony offers more flexibility in the implementation of new features and services. The Session Initiation Protocol (SIP) is becoming a popular signalling protocol for Voice over IP (VoIP) based applications. The SIP proxy server is a software application that provides call routing services by parsing and forwarding all the incoming SIP packets in an IP telephony network. The efficiency of this process can create large scale, highly reliable packet voice networks for service providers and enterprises. We established that the efficient design and implementation of the SIP proxy server architecture can enhance the performance characteristics of a SIP proxy server significantly. Since SIP proxy server performance can be characterised by its transaction states of each SIP session, we emulated the performance model of the SIP proxy server and studied some of the key performance benchmarks such as average response time to process the SIP calls, and mean number of SIP calls in the system. We showed its limitations, and then studied an alternative based SIP proxy server performance model with enhanced performance model and studied additional key performance characteristics such as server utilisation, queue size and memory utilisation. Provided the comparative results between the predicted results with the experimental results conducted in a lab environment. 相似文献
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Given a graph G=(V,E) with strictly positive integer weights ω
i
on the vertices i∈V, an interval coloring of G is a function I that assigns an interval I(i) of ω
i
consecutive integers (called colors) to each vertex i∈V so that I(i)∩I(j)=∅ for all edges {i,j}∈E. The interval coloring problem is to determine an interval coloring that uses as few colors as possible. Assuming that a
strictly positive integer weight δ
ij
is associated with each edge {i,j}∈E, a bandwidth coloring of G is a function c that assigns an integer (called a color) to each vertex i∈V so that |c(i)−c(j)|≥δ
ij
for all edges {i,j}∈E. The bandwidth coloring problem is to determine a bandwidth coloring with minimum difference between the largest and the
smallest colors used. We prove that an optimal solution of the interval coloring problem can be obtained by solving a series
of bandwidth coloring problems. Computational experiments demonstrate that such a reduction can help to solve larger instances
or to obtain better upper bounds on the optimal solution value of the interval coloring problem. 相似文献
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Ribs and fans are interesting geometric entities that are derived from a given Bezier curve or surface based on the recent theory of rib and fan decomposition. In this paper, we present some of new geometric properties of ribs and fans for a Bezier curve including composite fans, rib-invariant deformation, and fan-continuity in subdivision. We also give some examples for the presented properties. 相似文献
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Ribs and fans are interesting geometric entities that are derived from a given Béezier curve or surface based on the recent
theory of rib and fan decomposition. In this paper, we present some of new geometric properties of ribs and fans for a Béezier
curve including composite fans, rib-invariant deformation, and fan-continuity in subdivision. We also give some examples for
the presented properties.
A preliminary version of this paper appeared in Proc. the 1st Korea-China Joint Conference on Geometric and Visual Computing.
Joo-Haeng Lee received his B.S., M.S., and Ph.D. degrees in computer science from POSTECH, Korea, in 1994, 1996 and 1999, respectively.
He joined ETRI (Electronics and Telecommunications Research Institute), Korea in 1999, and is currently a senior researcher
at Digital Contents Division. His research interests include geometric modeling and processing algorithms for computer graphics,
CAD, and robotics.
Hyungjun Park is a professor of industrial engineering at Chosun University, Korea. He received his B.S., M.S., and Ph.D. degrees in industrial
engineering from POSTECH, Korea, in 1991, 1993, and 1996, respectively. From 1996 to 2001, he worked as a senior researcher
at Samsung Electronics, Korea. His current research interests include geometric modeling, computational geometry, reverse
engineering, bio-medical engineering, virtual prototyping, and CAD/CAM. 相似文献
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This paper describes the redesign of a systems engineering language called . This is an engineering language designed to specify and analyse industrial systems. The main objective of this redesign was to enable mathematical reasoning about specifications. We discuss the original language, the requirements and design decisions, and the resulting syntax and semantics of the new version of , called . In particular, we elaborate on semantical aspects of s time model. 相似文献
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A smooth robust dynamic feedback controller is constructed, and the problem of robust H∞ almost disturbance attenuation with internal stability is solved for high-order nonlinear systems with parameter uncertainties. Finally, illustrative example and simulation results demonstrate the effectiveness of the proposed method. 相似文献