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conference on active and passive smart structures and integrated systems XII

作者： Cinquemani, S. Resta, F. Politecn Milan Dept Mech Engn Via La Masa 1 I-20156 Milan Italy

ISBN: (数字)9781510616875

ISBN: (纸本)9781510616875

active vibration suppression can be profitably implemented on large structures to enhance their performance (eg. comfort, fatigue life, etc.). Application on large structures, however, often require a complex setup that makes these solutions too complex to be effectively used. That is because of the high number of sensors and actuators, suitably cabled, in addition to all the devices necessary to condition and amplify the signals of measurement and control and to execute in real time the control algorithms synthesized. One of the most effective technique to reach this goal is to increase the equivalent damping of the system and then the dissipation of the kinetic energy (the so called skyhook damping technique). This work is aimed to simplify this setup by using stand-alone smart dampers developed to carry out operations of vibration control in an autonomous way, thus containing an actuator, the sensors needed to evaluate the vibratory state of the structure, and a micro-controller embedding different control algorithm. The paper shows that the use of more devices, each working independently to perform a decentralized control, can be profitably used to better suppress vibration of the structure.

关键词： smart device Vibration control smart structures Damping

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Piezo shunt power flow optimization for composite beam stabilization

Piezo shunt power flow optimization for composite beam stabi...

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conference on active and passive smart structures and integrated systems

作者： Collet, Manuel Cunefare, Kenneth A. Beck, Benjamin CNRS UFC FEMTO ST Dept Appl Mech UMR 6174 24 Chemin Epitaphe Besancon France GW Woodruff Sch Mech Engn Atlanta GA 30313 USA

ISBN: (纸本)9780819471147

Numerical and technological tools have been developed for complete electromechanical integration of innovative shunting damping strategies for piezoelectric composite beam stabilization to realize a new type of hybrid piezocomposite smart structure. The approach enhances the performance of fully passive configurations to control mechanical power flow in a beam by using negative capacitance elements. In contrast to passive shunted components that target discrete modes, negative capacitance shunted piezoelectric transducers offer the potential for broadband control from the low Hertz into the kilohertz range. This paper presents an original approach to tune vibration power flow dispersion in a piezocomposite beam to obtain total wave absorption by only optimizing the electrical circuit configuration shunting a single piezopatch. The numerical study considers the power flow efficiency of the strategy and the stability and robustness difficulties observed when a single device is considered. The simplicity of the proposed electromechanical controlling device affords the possibility to define and realize distributed configurations and also lends itself to integrated distributed smart composite structures.

关键词： integrated smart composite power flow control shunted piezoelectric devices

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An adaptive optimal control for smart structures based on the subspace tracking identification technique

An adaptive optimal control for smart structures based on th...

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conference on active and passive smart structures and integrated systems

作者： Ripamonti, Francesco Resta, Ferruccio Borroni, Massimo Cazzulani, Gabriele Politecn Milan Dept Mech Engn I-20156 Milan Italy

ISBN: (纸本)9780819499837

A new method for the real-time identification of mechanical system modal parameters is used in order to design different adaptive control logics aiming to reduce the vibrations in a carbon fiber plate smart structure. It is instrumented with three piezoelectric actuators, three accelerometers and three strain gauges. The real-time identification is based on a recursive subspace tracking algorithm whose outputs are elaborated by an ARMA model. A statistical approach is finally applied to choose the modal parameter correct values. These are given in input to model-based control logics such as a gain scheduling and an adaptive LQR control.

关键词： Real-time identification ARMA/X models subspace tracking adaptive control

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Finite Element Formulation of Laminated Plate with Flexible Piezoelectric Actuators and Vibration Control Analysis

Finite Element Formulation of Laminated Plate with Flexible ...

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conference on active and passive smart structures and integrated systems

作者： Gopinath, T. Raja, S. Ikeda, Tadashige Ryerson Univ Toronto ON Canada Natl Aerosp Lab Bangalore Karnataka India Nagoya Univ Nagoya Aichi Japan

ISBN: (纸本)9780819485397

The use of surface bonded (MFC) and embedded (SAFC) piezoelectric composite actuators is examined through a numerical study. Modelling schemes are therefore developed by applying the isoparametric finite element approach to idealize normal strain to electric field and shear strain to electric field relations. A four noded coupled finite element is developed to compute the electro-mechanical responses of the active plate. A linear quadratic regulator is employed to perform the active vibration control studies. The system matrices of the smart plate structure are obtained and used in the state-space control model. Two elastic modes are considered, namely bending and torsion of the active plate. The emphasis is given to evaluate the performance of two different kinds of flexible piezoelectric actuators in vibration control application.

关键词： Macro Fiber Composite (MFC) Shear Actuated Fiber Composite (SAFC) active Vibration Control smart structures

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Optimal Synthesis of passive Adaptive Structural Networks for Damping and Stiffness Improvement

Optimal Synthesis of Passive Adaptive Structural Networks fo...

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conference on active and passive smart structures and integrated systems

作者： Lee, Soobum Semperlotti, Fabio Univ Maryland Baltimore Cty Dept Mech Engn 1000 Hilltop Circle Baltimore MD 21250 USA Univ Notre Dame Dept Aerosp & Mech Engn Notre Dame IN 46556 USA

ISBN: (纸本)9780819499837

The increasing interest in engineering systems with excellent mitigation of vibration and shock has required novel design approaches which provide systems with passive adaptive performance across the different fields of engineering. In this paper we present a novel modular design concept to synthesize passive adaptive structures upon a varied loading condition. This concept interconnects linear and nonlinear structural elements depending on the scale and performance requested to the final structural system. To realize this concept we developed a structural synthesis tool integrated with the genetic algorithm. The design optimization problem is formulated considering the prescribed design requirement on stiffness and damping performance. This tool optimally synthesizes the structural network by assembling the available constitutive elements in the set and successfully obtains passive adaptive assembly upon a varied loading condition in terms of vibration amplitude and frequency.

关键词： Structural network genetic algorithm loss factor bi-stable devices

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SEMI active TUNABLE MASS DAMPER FOR HELICOPTERS

SEMI ACTIVE TUNABLE MASS DAMPER FOR HELICOPTERS

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conference on active and passive smart structures and integrated systems

作者： Cinquemani, Simone Braghin, Francesco Resta, Ferruccio Politecn Milan Dept Mech Engn Via La Masa 1 I-20156 Milan Italy

ISBN: (数字)9781510608146

ISBN: (纸本)9781510608139;9781510608146

Helicopters are among the most complex machines ever made. While ensuring high performance from the aeronautical point of view, they are not very comfortable due to vibration mainly created by the main rotor. Traditionally this problem is solved by mounting several TMD inside the helicopter, each tuned to the frequency of the disturbance the main associated with the main rotor. In particular, this frequency is equal to the angular speed of the main rotor times the number of blades. Despite the angular speed of the main rotor is kept fixed and constant during the flight, it happens that some changes may be needed in particular situations. Therefore it happens that the mass dampers are no more tuned and thus ineffective. This leads to a significant increase of the amplitude of vibration. This work proposes to replace the purely passive systems with semi-active systems that are able to change their own natural frequency in order to be effective at each angular speed of the main rotor. The paper deals with the preliminary analysis of the project to numerically and experimentally evaluate the feasibility of this solution.

关键词： Fault detection Fiber Bragg Grating sensors Vibration control smart structures

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On the effect of electrical uncertainties on resonant piezoelectric shunting

On the effect of electrical uncertainties on resonant piezoe...

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conference on active and passive smart structures and integrated systems

作者： Porfiri, Maurizio Andreaus, Ugo Polytech Univ Dept Mech Aerosp & Mfg Engn Brooklyn NY 11201 USA Univ Roma La Sapienza Dipartimento Ingn Strutturale & Geotecn I-00184 Rome Italy

ISBN: (纸本)9780819466464

In this paper we study the effect of electrical uncertainties on resonant piezoelectric shunting. Simple closed-form formulas for quantifying the performance loss due to deterministic variations of the electrical elements are derived, and validated through numerical tests. The effect of stochastic perturbations is also considered, manageable formulas are provided, and validated by Monte Carlo simulations. The analyses focus on forced vibrations, and the arising H,,, optimization problem is solved by making use of fundamental properties of the system transfer function.

关键词： passive vibration control piezoelectric shunting resonant damping sensitivity analysis

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Design optimization of shape memory alloy active structures using the R-phase transformation

Design optimization of shape memory alloy active structures ...

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conference on active and passive smart structures and integrated systems

作者： Langelaar, Matthijs van Keulen, Fred Delft Univ Technol Dept Precis & Microsyst Engn NL-2628 CD Delft Netherlands

ISBN: (纸本)9780819466464

This article illustrates the opportunities that combining computational modeling and systematic design optimization techniques offer to facilitate the design process of shape memory alloy (SMA) structures. Focus is on shape memory behavior due to the R-phase transformation in Ni-Ti, for which a dedicated constitutive model is formulated. In this paper, efficient topology and shape optimization procedures for the design of SMA devices are described. In order to achieve fast convergence to optimized designs, sensitivity information is computed to allow the use of gradient-based optimization algorithms. The effectiveness of the various optimization procedures is illustrated by numerical examples, including the design of a miniature SMA gripper and a steerable SMA active catheter. It is shown that design optimization enables designers of SMA structures to systematically enhance the performance of SMA devices for a variety of applications.

关键词： shape memory alloys Ni-Ti R-phase topology optimization shape optimization sensitivity analysis active catheter

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PUSHOVER ANALYSIS METHOD FOR ASYMMETRIC STRUCTURE WITH passive ENERGY DISSIPATION DEVICES

PUSHOVER ANALYSIS METHOD FOR ASYMMETRIC STRUCTURE WITH PASSI...

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conference on active and passive smart structures and integrated systems

作者： Li Gang Li Hong-nan Dalian Univ Technol State Key Lab Costal & Offshore Engn Dalian 116023 Peoples R China

ISBN: (纸本)9780819475480

This paper presents a simplified method to calculate pushover curves for an asymmetric structure with displacement-dependent passive energy dissipation devices (DDPEDDs). The deformations of a symmetric structure are analyzed in translation and torsion, respectively. These results are then combined in order to calculate the pushover curve for an asymmetric structure with DDPEDDs. The numerical results obtained by using the simplified analytical method are then compared to those obtained from the analysis of the models using the software SAP2000. The results show that the simplified analytical method can be an effective tool for engineering analysis of an asymmetric structure.

关键词： displacement-dependent passive energy dissipation devices (DDPEDDs) translation analytical method push slide Energy dissipation engineering analysis ASYMMETRIC energy dissipation devices

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Adaptive Metacomposites for Vibroacoustic Control Applications

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IEEE SENSORS JOURNAL 2014年第7期14卷 2145-2152页

作者： Collet, Manuel Ouisse, Morvan Tateo, Flaviano CNRS FEMTO ST F-25000 Besancon France

Research activities in smart materials and structures are very important today and represent a significant potential for technological innovation in mechanics and electronics. The growing interest of our society in the problem of sustainable development motivates a broad research effort for optimizing mechanical structures in order to obtain new functional properties such as noise reduction, comfort enhancement, durability, decreased ecologic impact, and so forth. In order to realize such a multiobjective design, new methods are now available, which allow active transducers and their driving electronics to be directly integrated into otherwise passive structures. This new concept could allow fine control of the material physical behavior to induce new functional properties that do not exist in nature and that cannot be introduced by passive approaches. In this sense, we can speak of integrated distributed adaptive metacomposites that merge with the notion of programmable material. Through two different examples dealing with active acoustical impedance and elastodynamical interface, this paper presents theoretical tools and validations for designing specific applications of this new technology.

关键词： active noise and vibrations control aerospace control control system synthesis decentralized control distributed parameter systems distributed control metacomposites

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