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6th International Conference on Computational Methods in Structural Dynamics and Earthquake engineering, COMPDYN 2017

作者： Kapasakalis, K.A. Sapountzakis, E.I. Antoniadis, I.A. Institute of Structural Analysis and Antiseismic Reasearch School of Civil Engineering National Technical University of Athens Zografou Campus AthensGR-157 80 Greece Mechanical Design and Control Systems Section Mechanical Engineering Department National Technical University of Athens Zografou Campus AthensGR-157 80 Greece

ISBN: (纸本)9786188284418

A novel passive vibration isolation and damping concept is implemented to wind turbine towers in order to minimize their response, under wind or seismic loads. This concept, called KDamper, constitutes a combination of the classic Tunned Mass Damper isolation system (TMD) with negative stiffness elements. The formulation of the linear and non-liner dynamic problem is a prerequisite. A parametric study is performed to determine the optimal parameters of the KDamper which degradate the response. For this scope, the calculation process of the aerodynamic load that exerts along the tower of the wind turbine is described. A comparison with a non-isolated wind turbine, as long as with a TMD isolated wind turbine indicates that KDamper is a promising isolation system, offering numerous advantages, such as increased damping and simple technological implementations.

关键词： Wind turbines

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Parameter optimization of the KDamper concept in seismic isolation of bridges using harmony search algorithm 6

Parameter optimization of the KDamper concept in seismic iso...

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6th International Conference on Computational Methods in Structural Dynamics and Earthquake engineering, COMPDYN 2017

作者： Syrimi, Panagiota G. Sapountzakis, Evangelos J. Tsiatas, George C. Antoniadis, Ioannis A. Institute of Structural Analysis and Antiseismic Research School of Civil Engineering National Technical University of Athens Zografou Campus AthensGR-157 80 Greece Department of Mathematics University of Patras PatrasGR-265 04 Greece Mechanical Design and Control Systems Section Mechanical Engineering Department National Technical University of Athens Zografou Campus AthensGR-157 80 Greece

ISBN: (纸本)9786188284418

In this paper a novel design methodology for seismic isolation of bridges is presented employing the KDamper passive system and the Harmony Search (HS) optimization algorithm. The implementation of the KDamper concept to the absorption of seismic excitation of bridge structures requires the solution of a linear dynamic problem during which the basic parameters of KDamper design must be predefined. As this selection appears to be a quite complex procedure, the need for an optimization process is of paramount importance. In our work, an emerging metaheuristic algorithm, the Harmony Search algorithm, which has been successfully applied to several engineering problems, is employed to obtain optimum design parameters for a typical bridge structure under seismic excitation. The optimal solution is obtained for a set of 5 earthquake excitation records using as objective function the Root Mean Square of the displacement ratio. Comparative results of the dynamic response between the initial and the isolated structure are presented to verify the effectiveness, validity and reliability of the proposed design method.

关键词： Optimization

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Linear stochastic approximation algorithms and group consensus over random signed networks: A technical report with all proofs

arXiv

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arXiv 2017年

作者： Chen, Ge Duan, Xiaoming Mei, Wenjun Bullo, Francesco National Center for Mathematics and Interdisciplinary Sciences Key Laboratory of Systems and Control Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing100190 China Department of Mechanical Engineering Center of Control Dynamical-Systems and Computation University of California at Santa BarbaraCA93106-5070 United States

This paper studies linear stochastic approximation (SA) algorithms and their application to multi-agent systems in engineering and sociology. As main contribution, we provide necessary and sufficient conditions for convergence of linear SA algorithms to a deterministic or random final vector. We also characterize the system convergence rate, when the system is convergent. Moreover, differing from non-negative gain functions in traditional SA algorithms, this paper considers also the case when the gain functions are allowed to take arbitrary real numbers. Using our general treatment, we provide necessary and sufficient conditions to reach consensus and group consensus for first-order discrete-time multi-agent system over random signed networks and with state-dependent noise. Finally, we extend our results to the setting of multi-dimensional linear SA algorithms and characterize the behavior of the multi-dimensional Friedkin- Johnsen model over random interaction networks. Copyright © 2017, The Authors. All rights reserved.

关键词： Multi agent systems

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Convergent systems: Nonlinear simplicity

Convergent systems: Nonlinear simplicity

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International workshop on Nonlinear systems in honor of Henk Nijmeijer’s 60th birthday, 2016

作者： Pavlov, Alexey Van de Wouw, Nathan Statoil ASA P.b. 1004 Porsgrunn3905 Norway Department of Mechanical Engineering Eindhoven University of Technology EindhovenNoord-Brabant Netherlands Department of Civil Environmental and Geo-Engineering University of Minnesota MinneapolisMN United States Delft Center for Systems and Control Delft University of Technology Delft Netherlands

ISBN: (纸本)9783319303567

Convergent systems are systems that have a uniquely defined globally asymptotically stable steady-state solution. Asymptotically stable linear systems excited by a bounded time varying signal are convergent. Together with the superposition principle, the convergence property forms a foundation for a large number of analysis and (control) design tools for linear systems. Nonlinear convergent systems are in many ways similar to linear systems and are, therefore, in a certain sense simple, although the superposition principle does not hold. This simplicity allows one to solve a number of analysis and design problems for nonlinear systems and makes the convergence property highly instrumental for practical applications. In this chapter, we review the notion of convergent systems and its applications to various analyses and design problems within the field of systems and control. © Springer International Publishing Switzerland 2017.

关键词： Linear systems

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Analysis of anisotropic model and the effect of friction coefficient in a stretch forming process applied to AA2024 thin sheet

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UPB Scientific Bulletin, Series D: mechanical engineering 2017年第1期79卷 185-196页

作者： Pirva, Elisabeta Tudor, Andrei Gavrus, Adinel Cananau, Sorin Dept. Machine Elements and Tribology University POLITEHNICA of Bucharest Romania Dept. Mechanical and Control Systems Engineering Mechanical and Civil Engineering Laboratory LGCGM-EA3913 INSA Rennes UBL Rennes France

The deep drawing numerical simulation problem represents today an important interest for a sheet forming engineering design. This paper presents the results of Finite Elements Simulation of a stretch forming test based on the anisotropic mechanical behavior describing an AA2024 aluminum alloy. The numerical simulations applied to thin sheets are made using a Hill'48 anisotropic elasto-plastic model. The corresponding material coefficients are measured at 0°, 45° and 90° relative to the rolling direction to take into account the metallic sheet anisotropy. The samples cutting directions relative to the rolling one correspond to the above mentioned angles. Furthermore this study analyzes the effects of the Coulomb friction coefficient on the maximal principal stresses variation and on the obtained punch loads-displacement curves.

关键词： Aluminum alloys

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Robot mapping and localisation in metal water pipes using hydrophone induced vibration and map alignment by dynamic time warping

Robot mapping and localisation in metal water pipes using hy...

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2017 IEEE International Conference on Robotics and Automation, ICRA 2017

作者： Ma, Ke Schirru, Michele M. Zahraee, Ali Hassan Dwyer-Joyce, Rob Boxall, Joby Dodd, Tony J. Collins, Richard Anderson, Sean R. Department of Automatic Control and Systems Engineering University of Sheffield SheffieldS1 3JD United Kingdom Department of Mechanical Engineering University of Sheffield SheffieldS1 3JD United Kingdom Department of Civil and Structural Engineering University of Sheffield SheffieldS1 3JD United Kingdom

ISBN: (纸本)9781509046331

Water is a highly valuable resource so asset management of associated infrastructure is of critical importance. Water distribution pipe networks are usually buried, and so are difficult to access. Robots are therefore appealing for performing inspection and detecting damage to target repairs. However, robot mapping and localisation of buried water pipes has not been widely investigated to date, and is challenging because pipes tend to be relatively featureless. In this paper we propose a mapping and localisation algorithm for metal water pipes with two key novelties: the development of a new type of map based on hydrophone induced vibration signals of metal pipes, and a mapping algorithm based on spatial warping and averaging of dead reckoning signals used to calibrate the map (using dynamic time warping). Localisation is performed using both terrain-based extended Kalman filtering and also particle filtering. We successfully demonstrate and evaluate the approach on a combination of experimental and simulation data, showing improved localisation compared to dead reckoning. © 2017 IEEE.

关键词： Vibrations (mechanical)

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control of humanoid robot motions with impacts: Numerical experiments with reference spreading control

Control of humanoid robot motions with impacts: Numerical ex...

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2017 IEEE International Conference on Robotics and Automation, ICRA 2017

作者： Rijnen, Mark De Mooij, Eric Traversaro, Silvio Nori, Francesco Van De Wouw, Nathan Saccon, Alessandro Nijmeijer, Henk Department of Mechanical Engineering Eindhoven University of Technology Eindhoven5600MB Netherlands ICub Facility Istituto Italiano di Tecnologia Genoa16163 Italy Department of Civil Environmental and Geo-Engineering University of Minnesota MinneapolisMN55455 United States Delft Center for Systems and Control Delft University of Technology Delft2628CD Netherlands

ISBN: (纸本)9781509046331

This work explores the stabilization of desired dynamic motion tasks involving hard impacts at non-negligible speed for humanoid robots. To this end, a so-called reference spreading hybrid control law is designed showing promising results in simulation. The simulations are performed employing a dynamical model of an existing humanoid robot and impacts are assumed to be inelastic. The desired motion task consists of having the robot balancing on one foot while repeatedly making and breaking contact with a wall by means of one hand. The simulation results illustrate that the considered controller is suited to control humanoid robot motions with impacts. © 2017 IEEE.

关键词： Anthropomorphic robots

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Singular Perturbations of Volterra Equations with Periodic Nonlinearities. Stability and Oscillatory Properties

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IFAC-PapersOnLine 2017年第1期50卷 8454-8459页

作者： Smirnova V.B. Proskurnikov A.V. St. Petersburg State University of Architecture and Civil Engineering St. Petersburg Russian Federation St. Petersburg State University St. Petersburg Russian Federation Institute for Problems of Mechanical Engineering of the Russian Academy of Sciences St. Petersburg Russian Federation Delft Center for Systems and Control (DCSC) at Delft University of Technology Delft Netherlands ITMO University St. Petersburg Russian Federation

Singularly perturbed integro-differential Volterra equations with MIMO periodic nonlinearities are considered, which describe synchronization circuits (such as phase- and frequency-locked loops) and many other “pendulum-like” systems. Similar to the usual pendulum equation, such systems are typically featured by infinite sequences of equilibria points, and none of which can be globally asymptotically stable. A natural extension of the global asymptotic stability is the gradient-like behavior, that is, convergence of any solution to one of the equilibria. In this paper, we offer an efficient frequency-domain criterion for gradientlike behavior. This criterion is not only applicable to a broad class of infinite-dimensional systems with periodic nonlinearities, but in fact ensures the equilibria set stability under singular perturbation. In particular, the proposed criterion guarantees the absence of periodic solutions that are considered to be undesirable in synchronization systems. In this paper we also discuss a relaxed version of this criterion, which guarantees the absence of “high-frequency” periodic solutions, whose frequencies lie beyond a certain bounded interval. © 2017

关键词： gradient-like behavior integro-differential equation periodic solution phase synchronization systems Singular perturbation

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On the dynamics of deterministic epidemic propagation over networks

arXiv

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arXiv 2017年

作者： Mei, Wenjun Mohagheghi, Shadi Zampieri, Sandro Bullo, Francesco Department of Mechanical Engineering and Center for Control Dynamical Systems and Computation University of California Santa Barbara Santa BarbaraCA93106 United States Department of Electrical and Computer Engineering University of California at Santa Barbara Santa BarbaraCA93106 United States Department of Information Engineering University of Padova Italy

In this work we review a class of deterministic nonlinear models for the propagation of infectious diseases over contact networks with strongly-connected topologies. We consider network models for susceptible-infected (SI), susceptible-infected-susceptible (SIS), and susceptible-infected-recovered (SIR) settings. In each setting, we provide a comprehensive nonlinear analysis of equilibria, stability properties, convergence, monotonicity, positivity, and threshold conditions. For the network SI setting, specific contributions include establishing its equilibria, stability, and positivity properties. For the network SIS setting, we review a well-known deterministic model, provide novel results on the computation and characterization of the endemic state (when the system is above the epidemic threshold), and present alternative proofs for some of its properties. Finally, for the network SIR setting, we propose novel results for transient behavior, threshold conditions, stability properties, and asymptotic convergence. These results are analogous to those well-known for the scalar case. In addition, we provide a novel iterative algorithm to compute the asymptotic state of the network SIR system. Copyright © 2017, The Authors. All rights reserved.

关键词： Nonlinear dynamical systems

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Power scheduling in islanded-mode microgrids using fuel cell vehicles

Power scheduling in islanded-mode microgrids using fuel cell...

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IEEE Annual Conference on Decision and control

作者： Farid Alavi Nathan van de Wouw Bart De Schutter Delft Center for Systems and Control Delft University of Technology The Netherlands Department of Civil Environmental & Geo-Engineering University of Minnesota Minneapolis U.S.A. Department of Mechanical Engineering Eindhoven University of Technology The Netherlands

We consider power scheduling in a microgrid operated in the islanded mode. It is assumed that at any time all the renewable energy sources are generating the maximum achievable electrical power based on the weather conditions and the power balance of the microgrid is exclusively done by a fleet of fuel cell cars. As a result, the uncertainty in the prediction of the load will also make the future power generation of the fuel cell cars uncertain and, hence, a robust control method should be used to operate the fuel cell cars. We develop a min-max model predictive control approach to schedule the power generation profile of the fuel cell cars. Furthermore, we develop an alternative approach, a min-max disturbance feedback approach, in order to reduce the conservatism of the min-max approach. Finally, an illustrative case study shows the performance of the proposed approaches.

关键词： Automobiles Fuel cells Microgrids Power generation Hydrogen Electrochemical processes

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