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Vibration Suppression of a Flexible Structure

Procedia Engineering 2012年 48卷 233-241页

作者： Vladímir Villaverde Huertas Boris Rohaľ-Ilkiv Institute of Automation Measurement and Applied Informatics Faculty of Mechanical Engineering Slovak University of Technology in Bratisava N‡mestie Slobody 17 812 31 Bratislava Slovak Republic

This work addresses the solution to the problem of active vibration suppression of a cantilever beam using piezoelectric actuation. For this purpose, we are taking advantage of the effectiveness of the positive position feedback control strategy (PPF) in order to control first mode vibrations of the analyzed beam. This control technique is well-known in the literature as a modal control method for vibration attenuation. The PPF controller accomplishes its best performance if tuned properly to the characteristics of the structure to be controlled. According to this we are going to realize the modal analysis of the cantilever beam utilizing the finite element method in Ansys to determine the structural frequency corresponding to the first mode, which is used as PPF controller frequency. On the other hand, we shall obtain the state-space representation of the cantilever beam using the subspace identification method in frequency domain applying the fast fourier transformation (FFT). Furthermore, we will simulate the discrete-time PPF controller using Matlab/Simulink. Lastly, the simulink designed discrete-time PPF controller will be tested using an xPC Target real-time system.

关键词： Piezoelectric Actuation Positive Position Feedback Vibration Suppression Modal Analysis Subspace Identification Method

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Cognitive Control initiative

Cognitive Control initiative

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International Conference on Cognitive Infocommunications (CogInfoCom)

作者： József K. Tar Imre J. Rudas Krisztián Kósi Ádám Csapó Péter Baranyi Institute of Applied Mathematics Óbuda University Bécsi út 96/B H-1034 Budapest Hungary Institute of applied mathematics Obuda University Budapest Hungary Doctoral School of Applied Informatics Obuda University Budapest Hungary Cognitive Informatics Research Group Computer and Automation Institute Hungarian Academy of Sciences Budapest Hungary Cognitive Informatics Research Group Computer and Automation Institute of the Hungarian Academy of Sciences Budapest Hungary

In this paper, we make an initial effort to define the scope and goals of “Cognitive Control (CoCo)”, which intends to be a research initiative for bringing about a novel generation of control systems which - in a certain sense - reflect the behavior of humans while solving everyday tasks. Very briefly stated, through the use of a rich inventory of available modeling techniques, control theory has achieved profound results in model-based control approaches. However, these solutions do not seem to begin to approach the true level of human intelligence. We are convinced that by the synthesis of these “tools” from a particular point of view the great efficiency of human intelligence can be integrated/fused with the complementary virtues of our machines (e.g. high computing power, fast operation, etc.), and our CoCo initiative can be realized and applied in practice.

关键词： Mathematical model Computational modeling Neural networks Humans Function approximation Analytical models

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Cayley graphs of diameter two in interconnection networks

Cayley graphs of diameter two in interconnection networks

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MECHATRONIKA International Symposium

作者： Marcel Abas Institute of Applied Informatics Automation and Mathematics Faculty of Materials Science and Technology in Trnava Slovak University of Technology Bratislava Trnava Slovakia

Modeling of interconnection networks is a problem from the area of Mechatronics, which is a multidisciplinary field of engineering. In the modeling of interconnection networks, basic limitations are given by physical characteristics of the proposed network. Since the networks are modeled by graphs, the limitations are maximum degree and diameter of the graphs. The problem to determine the largest order (number of vertices) n(d, k) of a graph with given maximum degree d and diameter k is known as the degree-diameter problem. There is a well known upper bound on the order - Moore bound. A special kind of graphs that are highly symmetric are Cayley graphs (these graphs are vertex transitive). In this contribution we present a construction for Cayley graps with c(d, 2) ≥ 8/25 d 2 valid for all degrees d ≥ 6.

关键词： Multiprocessor interconnection Zinc Computers Generators Computational modeling Upper bound Program processors

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Solving a Four-Point Boundary Value Problem Fordynamical Systems with High-Speed Feedback with MATLAB

Solving a Four-Point Boundary Value Problem Fordynamical Sys...

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2012 International Conference on Affective Computing and Intelligent Interaction(ICACII 2012)

作者： Robert Vrabel Peter Schreiber Oliver Moravcik Ingrida Mankova Institute of Applied Informatics Automation and MathematicsFaculty of Materials Science and TechnologyHajdoczyho 1917 01 TrnavaSlovakia

This submission deals with the four-point boundary value problem for the nonlinear second-order systems with high-speed ***,we focus on the simulation techniques of the solutions on given finite length interval from an appearance of the so-called boundary layers point of *** layers correspond to the rapid region of transition in the exact *** Perturbation Theory is the mathematical framework that yields the tools to explore the complicated dynamical behavior of these systems.

关键词： Dynamicalsystemswith high-speed feedback,four-point boundary value problem,MATLAB

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Algorithms to Improve Tag Clouds

Algorithms to Improve Tag Clouds

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International Conference on Emerging Trends in Engineering and Technology, ICETET

作者： Ágnes Bogárdi-Mészöly András Rövid Hiroshi Ishikawa Department of Computer Science Shizuoka University Japan Department of Automation and Applied Informatics Budapest University of Technology and Economics Hungary Institute of Applied Mathematics Óbuda University Hungary

The spread of Web 2.0 has caused user-generated content explosion. Users can tag resources in order to describe and organize them. Tag clouds are visually depicted tags in order to facilitate browsing among numerous tags and resources. The goal of our paper is to improve tag clouds with vocabulary refinement and enhanced reference counts. Namely, three novel algorithms have been proposed to correct spelling and clerical errors, contract tags, and improve reference counts. The provided algorithms have been validated and verified on real-world tag clouds of a thesis portal.

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A modification of gradient policy in reinforcement learning procedure

A modification of gradient policy in reinforcement learning ...

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International Conference on Interactive Collaborative Learning (ICL)

作者： Marcel Abas Tomáš Skripčák Institute of Applied Informatics Automation and Mathematics Faculty of Materials Science and Technology in Trnava Slovak University of Technology in Bratislava Trnava Slovak Republic

ISBN: (纸本)9781467324250

The gradient of a scalar function is frequently used in various areas of mathematics. In informatics it can be used, for example, in the process of learning procedure of many control systems. The key observation is that gradient, if it is a non-zero vector, is a vector in the direction of greatest rate of the scalar function. In this contribution we show a method how to determine the direction(s) even if the gradient is zero vector. We show that this can be done with the knowledge which students have it their stage of study.

关键词： Vectors Learning Educational institutions Robots Control systems informatics automation

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On regular coderivatives in parametric equilibria with non-unique multipliers

On regular coderivatives in parametric equilibria with non-u...

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作者： Henrion, R. Outrata, J.V. Surowiec, T. Weierstrass Institute for Applied Analysis and Stochastics Mohrenstr. 39 10117 Berlin Germany Institute of Information Theory and Automation Pod vodárenskou vezí 4 18208 Praha 8 Czech Republic Centre for Informatics and Applied Optimization University of Ballarat P.O. Box 663 Ballarat VIC 3353 Australia Humboldt University Berlin Unter den Linden 6 10099 Berlin Germany

This paper deals with the computation of regular coderivatives of solution maps associated with a frequently arising class of generalized equations (GEs). The constraint sets are given by (not necessarily convex) inequalities, and we do not assume linear independence of gradients to active constraints. The achieved results enable us to state several versions of sharp necessary optimality conditions in optimization problems with equilibria governed by such GEs. The advantages are illustrated by means of examples. © 2012 Springer and Mathematical Optimization Society.

关键词： Mathematical programming

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Methodology for finger gesture control of mechatronic systems

Methodology for finger gesture control of mechatronic system...

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MECHATRONIKA International Symposium

作者： Apostolos Tsagaris Sotiris Manitsaris Evaggelos Hatzikos Athanasios Manitsaris Department of Applied Informatics MTCG Lab University of Macedonia Thessaloniki Greece Department of Automation Thessaloniki Technological Educational Institute of Thessaloniki Thessaloniki Greece

This paper proposes a methodology for the real-time finger gesture following and control of mechatronic systems based on computer vision and machine learning techniques. The goal of this research is to develop a human-machine interface that could be able to control a mechatronic system by performing finger gestures in space or on a surface without the use of any kind of keyboard neither a joystick. The finger gestures will be continuously followed and directly mapped with commands of mechatronic systems such as start moving, stop moving, forward moving, backward moving etc. The proposed methodology relies on the finger gesture data acquisition, hand segmentation, fingertips localization/ identification, high-level feature extraction, early recognition and prediction using machine learning techniques and its integration into a mechatronic system. The LEGO MINDSTORMS NXT robotics platform controlled by matlab software could be used in the proposed methodology.

关键词： Thumb Hidden Markov models Mechatronics Gesture recognition Control systems Keyboards

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Moving Horizon Observer for vibration dynamics with plant uncertainties in nanopositioning system estimation

Moving Horizon Observer for vibration dynamics with plant un...

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American Control Conference (ACC)

作者： Tomáš Polóni Arnfinn Aas Eielsen Boris Rohal'-Ilkiv Tor Arne Johansen Institute of Automation Measurement and Applied Informatics at the Faculty of Mechanical Engineering Slovak University of Technology Bratislava Slovakia Department of Engineering Cybernetics at the Norwegian University of Science and Technology Trondheim Norway

ISBN: (纸本)9781457710957

This paper considers the estimation of states and parameters of a Single-Degree-of-Freedom (SDOF) vibration model in nanopositioning system based on a nonlinear Moving Horizon Observer (MHO). The MHO is experimentally tested and verified on measured data. The information about the displacement and speed together with the system parameters and unmodeled force disturbance is estimated through the Sequential Quadratic Programming (SQP) optimization procedure. The MHO provided superior performance in comparison with the benchmark method Extended Kalman Filter (EKF) in terms of faster convergence.

关键词： Vectors Noise Mathematical model Vibrations Covariance matrix Force Equations

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NAMD Package Benchmarking on the Base of Armenian Grid Infrastructure

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Communications and Network 2012年第1期4卷 34-40页

作者： Armen Poghosyan Levon Arsenyan Hrachya Astsatryan Mikayel Gyurjyan Hovsep Keropyan Aram Shahinyan Institute for Informatics and Automation Problems National Academy of Sciences of the Republic of Armenia Yerevan Armenia Institute of Applied Problems of Physics National Academy of Sciences of the Republic of Armenia Yerevan Armenia International Scientific Educational Center National Academy of Sciences of the Republic of Armenia Yerevan Armenia

The parallel scaling (parallel performance up to 48 cores) of NAMD package has been investigated by estimation of the sensitivity of interconnection on speedup and benchmark results—testing the parallel performance of Myrinet, Infiniband and Gigabit Ethernet networks. The system of ApoA1 of 92 K atoms, as well as 1000 K, 330 K, 210 K, 110 K, 54 K, 27 K and 16 K has been used as testing systems. The Armenian grid infrastructure (ArmGrid) has been used as a main platform for series of benchmarks. According to the results, due to the high performance of Myrinet and Infiniband networks, the ArmCluster system and the cluster located in the Yerevan State University show reasonable values, meanwhile the scaling of clusters with various types of Gigabit Ethernet interconnections breaks down when interconnection is activated. However, the clusters equipped by Gigabit Ethernet network are sensitive to change of system, particularly for 1000 K systems no breakdown in scaling is observed. The infiniband supports in comparison with Myrinet, make it possible to receive almost ideally results regardless of system size. In addition, a benchmarking formula is suggested, which provides the computational throughput depending on the number of processors. These results should be important, for instance, to choose most appropriate amount of processors for studied system.

关键词： Parallel Molecular Dynamics NAMD Benchmarking Grid

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