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作者： Mayhew, Christopher G. Teel, Andrew R. Robert Bosch Research and Technology Center 4005 Miranda Ave. Palo Alto CA 94304 United States Center for Control Engineering and Computation Electrical and Computer Engineering Department University of California Santa Barbara CA 93106-9560 United States

ISBN: (纸本)9781457700804

Achieving global asymptotic stabilization of rigid-body attitude is impossible using smooth feedback;however, this obstruction can be overcome using a hybrid controller that coordinates a "synergistic" family of potential functions and their corresponding feedbacks. In this paper, we show that it is impossible to construct a synergistic family of potential functions from the widely used class of "modified trace functions," despite the fact that one can choose a subset of these functions whose only common critical point is the identity element. With this as motivation, we introduce a parametrized diffeomorphism that is capable of altering the critical behavior of potential functions and generating a synergistic family, paving the way for global asymptotic attitude stabilization of rigid-body attitude by hybrid feedback. © 2011 AACC American Automatic control Council.

关键词： Feedback

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Hide-and-seek with directional sensing

Hide-and-seek with directional sensing

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作者： Borri, Alessandro Bopardikar, Shaunak D. Hespanha, Joao P. Di Benedetto, Maria D. Department of Electrical Engineering University of L'Aquila Italy Center for Control Dynamical Systems and Computation University of California Santa Barbara CA 93106 United States

ISBN: (纸本)9783902661937

We consider a game played between a hider, who hides a static object in one of several possible positions in a bounded planar region, and a searcher, who wishes to reach the object by querying sensors placed in the plane. The searcher is a mobile agent, and whenever it physically visits a sensor, the sensor returns a randomdirection, corresponding to a half-plane in which the hidden object is *** first present a novel search heuristic and characterize bounds on the expected distance covered before reaching the object. Next, we model this game as a large-dimensional zero-sum dynamic game and we apply a recently introduced randomized sampling technique that provides a probabilistic level of security to the hider. We observe that, when the randomized sampling approach is only allowed to select a very small number of samples, the cost of the heuristic is comparable to the security level provided by the randomized procedure. However, as we allow the number of samples to increase, the randomized procedure provides a higher probabilistic security level. © 2011 IFAC.

关键词： Mobile agents

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Absolute maximal entanglement and quantum secret sharing

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Physical Review A 2012年第5期86卷 052335-052335页

作者： Wolfram Helwig Wei Cui José Ignacio Latorre Arnau Riera Hoi-Kwong Lo Center for Quantum Information and Quantum Control (CQIQC) Department of Physics and Department of Electrical and Computer Engineering University of Toronto Toronto Ontario M5S 3G4 Canada Departament d’Estructura i Constituents de la Matèria Universitat de Barcelona 647 Diagonal 08028 Barcelona Spain Max Planck Institute for Gravitational Physics Albert Einstein Institute Am Mühlenberg 1 D-14476 Golm Germany Dahlem Center for Complex Quantum Systems Freie Universität Berlin 14195 Berlin Germany

We study the existence of absolutely maximally entangled (AME) states in quantum mechanics and its applications to quantum information. AME states are characterized by being maximally entangled for all bipartitions of the system and exhibit genuine multipartite entanglement. With such states, we present a parallel teleportation protocol which teleports multiple quantum states between groups of senders and receivers. The notable features of this protocol are that (i) the partition into senders and receivers can be chosen after the state has been distributed, and (ii) one group has to perform joint quantum operations while the parties of the other group only have to act locally on their system. We also prove the equivalence between pure state quantum secret sharing schemes and AME states with an even number of parties.

关键词： QUANTUM entanglement QUANTUM information theory QUANTUM teleportation INFORMATION sharing DISTRIBUTION (Probability theory)

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Some Fundamental Relaxation Properties Of Fractional Order Weighted Distributed Parameter Maxwell Model

Some Fundamental Relaxation Properties Of Fractional Order W...

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第五届国际自动控制联合会分数阶导数及其应用会议

作者： Lili Cao Yan Li Guohui Tian Baodong Liu YangQuan Chen School of Mathematics Shandong University Jinan Shandong 250061 P. R. China School of Control Science and Engineering Shandong University Jinan Shandong 250061 P. R. China Software College Shandong University Jinan Shandong 250061P. R. China Center for Self-Organizing and Intelligent Systems (CSOIS) Electrical and Computer Engineering Department Utah State University Logan UT 84322 USA

In this paper,we derive in time domain the constitutive equation and relevant properties of the fractional order weighted distributed parameter Maxwell *** weight function can be replaced by the Fourier series,which leads to three types of fractional order distributed parameter *** inverse Laplace transformand asymptotic properties

关键词： Some Fundamental Relaxation Properties Of Fractional Order Weighted Distributed Parameter Maxwell Model Fourier

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Modeling and simulation of 500 kV transmission network for numerical fault calculation, detection, using PSCAD/EMTDC

Modeling and simulation of 500 kV transmission network for n...

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2011 Asia-Pacific Power and Energy engineering Conference, APPEEC 2011

作者： Kajoijilertsakul, Pairoj Asawasripongtorn, Santi Sanposh, Peerayot Suwatthikul, Jittiwut Fujita, Hideaki Department of Electrical Engineering Faculty of Engineering Kasetsart University Bangkok Thailand Industrial Control and Automation Laboratory National Electronics and Computer Technology Center Bangkok Thailand Department of Electrical and Electronic Engineering Tokyo Institute of Technology Tokyo Japan

ISBN: (纸本)9781424462551

This paper presents modeling of the 500 kV transmission line located between Bang-Saphan 2 (BSP2) and Chom-Bung (CBG) substations, Thailand. The network is modeled based on the transient simulation program- PSCAD/EMTDC. The equivalent circuit of BSP2 and CBG is obtained from the actual parameters. The initial condition parameters are verified by PSS/E, an electrical simulation program. After the modeling has been established, a fault analysis is done by using PSCAD/EMTDC in order to study the system response when fault constrains are applied. This paper has illustrated that how the information on the sampled voltage and current waveforms derived from PSCAD/EMDTC modeling and simulation can be used for fault detection, classification and location. © 2011 IEEE.

关键词： Equivalent circuits

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Wavelet based fault detection, classification and location in existing 500 kV transmission line

Wavelet based fault detection, classification and location i...

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International Conference on electrical engineering/Electronics, computer, Telecommunications and Information Technology

ISBN: (纸本)9781457704246

This paper describes the implementation of Wavelet Transform and Spectral Energy analysis on samples of simulated voltage and current waveforms obtained from PSCAD/EMTDC for each of the all possible fault scenarios in a modeled 500 kV transmission network. The fault detection and classification of each fault scenarios is determined based on results of the voltage and current waveforms analysis in time and wavelet domains. The analysis is carried out including variation in fault types, inception angles and locations with a practically arbitrarily assumed fault duration. The analytical results shows that the described technique is highly dependable and is able to detect and classify different kinds of faults along a transmission line whatever is the fault type, inception angle and location. © 2011 IEEE.

关键词： Wavelet transforms

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A new method for hybrid-fuzzy identification

A new method for hybrid-fuzzy identification

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作者： Núñez, Alfredo Sáez, Doris Škrjanc, Igor De Schutter, Bart Delft Center for Systems and Control Delft University of Technology Delft Netherlands Electrical Engineering Department Universidad de Chile Santiago Chile Faculty of Electrical and Computer Engineering University of Ljubljana Slovenia

ISBN: (纸本)9783902661937

In this paper a new identification method for non-linear hybrid systems that have mixed continuous and discrete states by using fuzzy clustering and principal component analysis is described. The method first determines the hybrid characteristic of the system inspired by an inverse form of the merge method for clusters, which makes it possible to identify the unknown switching points of a process based on just input-output data. Using the switching points, a hard partition of the input-output space is obtained. Then, we propose to use Takagi-Sugeno (TS) fuzzy models with Gaussian MFs as sub-models for each partition. Thus, the overall model is hybrid-fuzzy and will include explicitly the hybrid behavior of the system (the detected switching points) by means of binary MFs, and in each partition all the other non-linearities by means of TS sub-models. An illustrative experiment on a hybrid-tank system is conducted to present the benefits of the proposed approach. © 2011 IFAC.

关键词： Principal component analysis

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On quaternion-based attitude control and the unwinding phenomenon

On quaternion-based attitude control and the unwinding pheno...

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作者： Mayhew, Christopher G. Sanfelice, Ricardo G. Teel, Andrew R. Robert Bosch Research and Technology Center 4005 Miranda Ave. Palo Alto CA 94304 United States Department of Aerospace and Mechanical Engineering University of Arizona Tucson AZ 85721 United States Center for Control Engineering and Computation Electrical and Computer Engineering Department University of California Santa Barbara CA 93106-9560 United States

ISBN: (纸本)9781457700804

The unit quaternion is a pervasive representation of rigid-body attitude used for the design and analysis of feedback control laws. Often, quaternion-based feedbacks require an additional mechanism that lifts a continuous attitude path to the unit quaternion space. When this mechanism is memoryless, it has a limited domain where it remains injective and leads to discontinuities when used globally. To remedy this limitation, we propose a hybrid-dynamic algorithm for lifting a continuous attitude path to the unit quaternion space. We show that this hybrid-dynamic mechanism allows us to directly translate quaternion-based controllers and their asymptotic stability properties (obtained in the unit-quaternion space) to the actual rigid-body-attitude space. We also show that when quaternion-based controllers are not designed to account for the double covering of the rigid-body-attitude space by a unit-quaternion parameterization, they can give rise to the unwinding phenomenon, which we characterize in terms of the projection of asymptotically stable sets. © 2011 AACC American Automatic control Council.

关键词： controllers

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Synergistic Lyapunov functions and backstepping hybrid feedbacks

Synergistic Lyapunov functions and backstepping hybrid feedb...

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ISBN: (纸本)9781457700804

The notion of synergistic potential functions has been introduced recently in the literature and has been used as the basis for the design of hybrid feedback laws that achieve global asymptotic stabilization of a point on a compact manifold (without boundary) such as S1, S2, and SO(3). Here, synergistic potential functions are generalized - to synergistic Lyapunov functions - and are shown to be amenable to backstepping. In particular, if an affine control system admits a (weak) synergistic Lyapunov function and feedback pair then the system with an integrator added at the input also admits a synergistic Lyapunov and feedback pair. This fact enables "smoothing" hybrid feedbacks, or implementing them through a chain of integrators. In this way, hybrid control designed at a kinematic level can be redesigned for control through forces, torques, or even the derivative of these quantities. We demonstrate the backstepping procedure for attitude stabilization of a rigid body using a quaternion parametrization. © 2011 AACC American Automatic control Council.

关键词： Lyapunov functions

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On the non-robustness of inconsistent quaternion-based attitude control systems using memoryless path-lifting schemes

On the non-robustness of inconsistent quaternion-based attit...

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ISBN: (纸本)9781457700804

The unit quaternion is a pervasive representation of rigid-body attitude used for the design and analysis of feedback control laws. Quaternion-based feedback control laws that are inconsistent (i.e. do not have a unique value for a given attitude) require an additional mechanism that lifts a continuous attitude trajectory to the unit quaternion space. Lifting mechanisms that are memoryless, for example, selecting the quaternion having positive scalar component, have a limited domain where they remain injective and, when used globally, introduce discontinuities into the closed-loop system. We show that such discontinuities can be exploited by an arbitrarily small measurement disturbance to stabilize attitudes far from the desired attitude and destroy "global" attractivity properties. © 2011 AACC American Automatic control Council.

关键词： Closed loop systems

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