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conference on active and passive smart structures and integrated systems XII

作者： Marconi, Jacopo Cazzulani, Gabriele Riva, Emanuele Braghin, Francesco Politecn Milan Dept Mech Via La Masa 1 I-20156 Milan Italy

ISBN: (数字)9781510616875

ISBN: (纸本)9781510616875

Spatiotemporal periodic structures are systems whose properties are periodically modulated both in space and time, able to support waves only in one direction, so breaking the so called reciprocity principle. Studies till now focused mainly on continuous systems, where properties are modulated in a continuous manner both in space and time. However, this is not the case of real mechanical systems: if on the one hand it is possible to think of a continuous temporal modulation by the means of an actively controlled smart material, on the other hand it is really hard to imagine a system that can be controlled punctually in space. For this reason discretely modulated structures are studied in this work, putting in evidence the differences with the continuous ones and providing some basis for the actual design of such a system.

关键词： smart structures Periodic structures Space-Time Modulation Broken Reciprocity

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active vibration control using noncollocated piezoelectric film sensor/actuator

Active vibration control using noncollocated piezoelectric f...

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conference on active and passive smart structures and integrated systems

作者： Nishigaki, Tsutomu Kinki Univ Fac Biol Oriented Sci & Technol Wakayama 6496493 Japan

ISBN: (纸本)9780819485397

In order to overcome the difficulties of multimodal active vibration damping of the flexible thin structure using simultaneous piezoelectric sensing and actuation, an noncollocated vibration control method, in which piezoelectric film sensors and actuators were shaped using different shaping functions, was proposed in this paper. At first, fundamental equations were summarized and vibration responses of the beam were derived based on the modal coordinate systems. Then, it was shown that by considering phase characteristics of the controller in conjunctions with the polarity of the piezofims in high order frequencies, multimodal control will be implemented both theoretically and experimentally.

关键词： Piezoelectric film Distributed sensor/actuator active vibration control Flexible structure

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A semi-active damper in vertical secondary suspension for the comfort increase in passenger trains

A semi-active damper in vertical secondary suspension for th...

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conference on active and passive smart structures and integrated systems

作者： Ripamonti, Francesco Chiarabaglio, Andrea Resta, Ferruccio Politecn Milan Dept Mech Via La Masa 1 I-20156 Milan Italy

ISBN: (数字)9781510608146

ISBN: (纸本)9781510608139;9781510608146

passive oil dampers for railway vehicles present a damping and stiffness characteristics, which depend from excitation history. This behaviour is not acceptable for many high-performance applications. A mechatronic approach, able to continuously adjust the damping coefficient according to the operation requirements, represents a very attractive and smart solution. In this paper, a control strategy for semi-active dampers of train vertical secondary suspensions is presented. The controller aims at assuring the maximum available damping at low frequencies, while at high frequencies minimizes the force transmitted to the carbody that excites the bending modes.

关键词： hydraulic dampers twin-tube shock absorber semi-active damper

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Preliminary studies on SMA embedded wind turbine blades for passive control of vibration 12

Preliminary studies on SMA embedded wind turbine blades for ...

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conference on active and passive smart structures and integrated systems XII

作者： Haghdoust, P. Cinquemani, S. Lo Conte, A. Politecn Milan Dept Mech Engn Via La Masa 1 I-20156 Milan Italy

ISBN: (数字)9781510616875

ISBN: (纸本)9781510616875

Wind turbine blades are being bigger and bigger, thus requiring lightweight structures that are more flexible and thus more sensitive to dynamic excitations and to vibration problems. This paper investigates a preliminary architecture of large wind turbine blades, embedding thin sheets of SMA to passively improve their total damping. A phenomenological material model is used for simulation of strain-dependent damping in SMA materials and an user defined material model was developed for this purpose. The response of different architectures of SMA embedded blades have been investigated in the time domain to find an optimal solution in which the less amount of SMA is used while the damping of the system is maximized

关键词： Shape Memory Alloy passive Damping smart Turbine Blades

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smart adaptronic hydrostatic guiding system for machine tool slides

Smart adaptronic hydrostatic guiding system for machine tool...

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conference on active and passive smart structures and integrated systems

作者： Munzinger, C. Weis, M. Herder, S. Univ Karlsruhe TH wbk Inst Prod Sci Kaiserstr 12 D-76131 Karlsruhe Germany

ISBN: (纸本)9780819475480

Guiding systems figure amongst the central components in the flux of a machine tool. Their characteristics have a direct impact on machining accuracy. Hydrostatic guiding systems are preferably used when specific requirements are to be met with regards to accuracy, stiffness and damping. However, an active intervention in the guiding system of such conventional systems, i.e. to absorb geometrical guiding rail errors, has so far not been possible. Compared to modular, conventional systems, adaptronic systems offer considerable cost savings potentials thanks to their increased functional degree of integration [1].

关键词： Transducers Sensors Actuators Control systems Amplifiers Dynamical systems Resistance Signal detection Signal processing Intelligence systems

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A passive control methodology for seismic safety enhancement of monumental structures

A passive control methodology for seismic safety enhancement...

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conference on active and passive smart structures and integrated systems

作者： Papalou, Angeliki Roubien, Denis Triantafillou, Thanasis Strepelias, Elias Technol Educ Inst Western Greece Dept Civil Engn TE Patras 26334 Greece Univ Patras Dept Civil Engn GR-26110 Patras Greece

ISBN: (纸本)9781628415346

A passive control methodology to increase the seismic safety of multi-drum columns is presented. The response of a large scale column-model to dynamic excitations is investigated experimentally. A particle damper is used to replace one of the columns' original drums. The influence of the system parameters on the response of the column is also examined. The seismic response of the column can be considerably reduced if a particle damper replaces a drum above the mid-height. Guidelines and a design methodology are proposed to restore and protect monumental structures consisting of multi-drum columns.

关键词： monument multi-drum column passive control particle damper

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active vibration control for a smart panel with enhanced acoustic performances

Active vibration control for a smart panel with enhanced aco...

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conference on active and passive smart structures and integrated systems

作者： Ripamonti, Francesco Baro, Simone Molgora, Manuel Politecn Milan Dept Mech Via La Masa 1 I-20156 Milan Italy

ISBN: (数字)9781510608146

ISBN: (纸本)9781510608139;9781510608146

The spread of smart structures has recorded a significant increase during the last decades. Nowadays these solutions are applied in various fields such as aerospace, automotive and civil constructions. This kind of structures was born in the past in order to cope with the high vibrations that every lightweight structure has to face. In order to reduce weight designers usually decide to use very thin and lightweight structures. In the automotive field, for example, a reduced fuel consumption is obtained employing lightweight materials. However, in general a worsening of the vibroacoustic comfort is obtained with undesired vibrations that can be really annoying for passengers and dangerous for the structure itself. This work presents an innovative smart plate that is able to actively vary its dynamic properties, by means of an IMSC control logic, in order to improve the acoustic performances. An investigation about the system response in the high frequency range allowed to assess the behavior in terms of absorption, reflection coefficient and transmission loss.

关键词： active Vibration Control (AVC) smart Structure Acoustic Behavior Aluminum Panels

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passive and active data porting to composite integrated optical fibers via integrated optics

Passive and active data porting to composite integrated opti...

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conference on active and passive smart structures and integrated systems

作者： Teitelbaum, M. E. O'Brien, D. J. Wetzel, E. D. Goossen, K. W. Univ Delaware Dept Elect & Comp Engn Newark DE 19716 USA Univ Delaware Ctr Composite Mat Newark DE USA US Army Res Lab Aberdeen MD USA

ISBN: (纸本)9780819471147

Novel methods for remote coupling of light into optical fibers embedded in composite structures has been explored. A passive technique in which light is coupled via a 45 degrees angled mirror manufactured at the end of a plastic optical fiber (POF) was explored as well as an active technique in which a dye-impregnated POF was used to couple light to immersed fibers without physical connectorization. The fibers were immersed in fluids with different refractive indices to determine the effect of index on the coupling efficiency and simulate optical fibers embedded in a polymer composite. The passive technique proved much more efficient with a maximum efficiency of 91.4% achieved in an index of 1.33. The dye-impregnated POF was much less efficient with typical values ranging from 1%-2% for various indexes.

关键词： plastic optical fiber fiber optic sensors smart materials remote query normal incidence query

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Multifunctional smart material system (MSMS) using shape memory alloys and shape memory polymers

Multifunctional smart material system (MSMS) using shape mem...

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conference on active and passive smart structures and integrated systems

作者： Ghosh, Pritha Rao, Ashwin Srinivasa, A. R. Texas A&M Univ Dept Mech Engn College Stn TX 77843 USA

ISBN: (纸本)9780819489982

A Multifunctional smart material system consists of two or more different smart material phases in the form of a hybrid system, in which every phase performs a different but necessary function. In this work, we show how thermally responsive Shape memory alloys (SMA) and Shape Memory Polymers (SMP) can be combined to form a Multifunctional smart Material system (MSMS). The transformation temperatures M-f, M-s, A(s) and A(f) of SMA and the glass transition T-g for the SMP play a critical role in designing such a MSMS. We illustrate how varying the T-g of SMP between the transformation temperatures M-f and A(f) of SMA results in a multi-state smart bias system with varying stiffnesses. In addition, we establish guidelines for the volume fractions of the individual constituents of such MSMSs to form "smart-bias" tools/devices. We further propose various ideas for smart devices that can operate through three temperature ranges, with one material constituent being passive and the other active at a given temperature.

关键词： multifunctional material systems shape memory polymers shape memory alloys smart bias structures smart composites multistate devices smart material design

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Methods and possibilities of a virtual design for actively controlled smart systems

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COMPUTERS & structures 2008年第3-5期86卷 240-250页

作者： Gabbert, Ulrich Nestorovic, Tamara Wuchatsch, Janko Otto VonGuericke Univ Magdegurg Inst Mech D-39106 Magdeburg Germany

The objective of this paper is to present an overall approach and to point out the methods and possibilities of a virtual design for actively controlled smart systems with the intention to use the suggested approach and methods for the subsequent prototype and real active systems development. The suggested methods of the virtual design are computer aided, including different software tools used to generate models necessary for the overall virtual design. The basis of the approach is an overall finite element (FE) or a multi-body system (MBS) model of the smart system including the passive parts of the machine or structure as well as the actuators and sensors and the control algorithm. (c) 2007 Elsevier Ltd. All rights reserved.

关键词： virtual design smart systems overall design finite element modelling multi-body systems model active vibration control

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