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检索条件"任意字段=Conference on Active and Passive Smart Structures and Integrated Systems IX"

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Towards resilient adaptive origami-inspired diagrid building envelope 12

Towards resilient adaptive origami-inspired diagrid building...

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conference on active and passive smart structures and integrated systems XII

作者： Bellamy, Amanda Boustani, Jonathan Brehm, Christoph Soto, Mariantonieta Gutierrez Univ Kentucky Dept Civil Engn 161 Oliver H Raymond Bldg Lexington KY 40506 USA Univ Kentucky Dept Mech Engn 151 Ralph G Anderson Bldg Lexington KY 40506 USA

ISBN: (数字)9781510625907

ISBN: (纸本)9781510625891;9781510625907

Natural disasters, such as hurricanes, cyclones, and other high-speed windstorm events, pose a threat to the built environment. The damage of the nonstructural components due to high winds, flooding, hurricane surge and rainwater intrusion surrounding a building structure such as the facade accounts for the majority of the financial loss. The increased interest in the sustainable design of buildings gives forward to the development of creative low energy alternatives for the adaptive facade. This paper studies five facade configurations subjected to wind loading. An adaptive diagrid facade (ADF) is modeled using a panel system of four equilateral triangles: one panel is actuated at the nodes using linear actuators and controls the other three panels in the system. The proposed ADF can be adapted to fit various building heights and shapes and can be chosen due to their structural efficiency that results in material savings and flexibility in designing of complex buildings. This paper makes advances towards an adaptive origami-inspired diagrid facade has the potential to redistribute wind loads in real-time. With sustainable design becoming an important factor in design, low energy options for the adaptive facades were considered. This research performs computational fluid dynamic analysis of five three-dimensional building structures: a conventional regular building structure, a diagrid building structure without corner columns, and three origami-inspired facade configurations on diagrid building structures. The purpose of this study is to understand effects of the different building envelope geometries on the fluid dynamics and explore the potential use in optimal shape configuration for real-time morphing adaptation of high-rise buildings subjected to extreme wind loading.

关键词： smart structures adaptive building envelope morphing origami wind

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Nonlinear characterization of piezoelectric patches and piezoelectric stacks from vibrations of piezo-actuated structures 12

Nonlinear characterization of piezoelectric patches and piez...

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conference on active and passive smart structures and integrated systems XII

作者： Shivashankar, P. Gopalakrishnan, S. Kandagal, S. B. Indian Inst Sci Dept Aerosp Engn Bangalore 560012 Karnataka India

ISBN: (数字)9781510625907

ISBN: (纸本)9781510625891;9781510625907

Just as it is indubitably accepted that the piezoelectric actuators do not behave in a linear fashion when subjected to strong electric fields, it was also believed that they behaved in a linear manner at weak electric fields excitations. But this notion was shattered by the experimental evidence offered by researchers in recent years, where it was observed that the piezo-actuators behaved non-linearly even when actuated at voltages which resulted in weak electric fields in the piezoelectric actuator. Most of the experiments, however, were conducted on the piezoelectric patches, and consequently most of the studies were aimed at establishing the non-linear relationship in the "31" electromechanical coupling, and the nonlinear elastic relation of the material along the longitudinal axis. Though this may be expected due to the widespread usage of the patches, the "33" coupling needs to be investigated too-as stack actuators are the preferred ones for the actuation of large structures. This study aims at characterizing the nonlinear behavior both in the patches and the stacks;thereby establishing the nonlinear constitutive equations for both the "31" and "33" coupling. To achieve this, a two-step experimental procedure was followed, wherein, firstly, the mechanical domain was isolated and studied to establish the non-linear elastic behavior. Later, equipped with the nonlinear stress-strain relation, experiments were conducted to identify the nature of the nonlinearity in the electromechanical coupling. Unlike the two-step experimental procedure, which facilitates a separate investigation into the mechanical domain and the electromechanical coupling, the experimental procedures employed in the previous studies yield data which mixes the contributions from both the mechanical domain and the electromechanical coupling. The experiments were conducted to obtain a family of displacement frequency response curves of the bending modes of a piezoelectric-beam and a piezostack-b

关键词： Nonlinear piezoelectric behavior Piezoelectric actuators Nonlinear constitutive equation backbone curves piezoelectric stack

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Adaptive and compliant wingtip devices enabled by additive manufacturing and multistable structures 9

Adaptive and compliant wingtip devices enabled by additive m...

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conference on Bioinspiration, Biomimetics, and Bioreplication ix, held at SPIE smart structures + Nondestructive Evaluation

作者： Gustafson, Kimberly Urrutia, Luis Pankonien, Alexander Reich, Gregory Wissa, Aimy Univ Illinois 105 South Matthews Ave Urbana IL 61801 USA US Air Force Res Lab Wright Patterson AFB OH 45433 USA

ISBN: (数字)9781510625860

ISBN: (纸本)9781510625853;9781510625860

Multifunctional lifting surfaces can expand the mission capabilities of aerial vehicles with a minimal number of components added to the vehicle. This paper presents a bio-inspired segmented wingtip concept for lift enhancement enabled by passive structural tailoring and active bistable truss mechanisms. The development of wingtips stems from studies of birds with desirable flight capabilities. The structural characteristics and maneuverable changes of a bird's primary feathers during flight have identified three notable feather degrees of freedom: incidence angle, dihedral angle, and gap spacing. Wind tunnel experiments conducted on multi-wingtip systems have determined that different wingtip orientations and spacings are desired to enhance aerodynamic performance depending on the flight conditions. These results suggest that the wingtip degrees of freedom must be varied during flight to achieve optimal aerodynamic performance. This paper presents two structural concepts, one passive and one active, to achieve desired morphological wingtip parameters during flight. The passive structural concept exploits bend-twist coupling of additively manufactured composite laminate wingtips by using aerodynamic loads to induce passive shape adaptation of the composite wingtips to control the twist and dihedral angles. The active concept utilizes bistable truss mechanisms to vary the wingtip gap spacing. The force-displacement responses of bistable mechanisms and the bending and twist of bend-twist coupled composite wingtips are measured using a universal testing machine and Digital Image Correlation, respectively. Experimental results include the energy storage characterization of the bistable mechanisms as a function of material characteristics and the bend-twist coupling of the composite wingtips as a function of fabrication process and laminate properties.

关键词： Incidence angle - wingtip angle of attack relative to the base wing angle of attack dihedral angle - angle between the span of the base wing and the span of a wingtip gap spacing - chordwise distance between wingtips expressed as a percent of the base wing chord length

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Wave propagation in Auxetic mechanical metamaterial: Bloch formalism for various boundary conditions 12

Wave propagation in Auxetic mechanical metamaterial: Bloch f...

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conference on active and passive smart structures and integrated systems XII

作者： Gupta, Vivek Chattoraj, Anwesha Banarjee, Arnab Bhattacharya, Bishakh Indian Inst Technol Kanpur Smart Mat Struct & Syst Lab Kanpur Uttar Pradesh India Indian Inst Technol Kanpur Dept Mech Engn Kanpur Uttar Pradesh India Delhi Technol Univ Dept Mech Engn Delhi India Indian Inst Technol Jammu Dept Civil Engn Jammu Jammu & Kashmir India

ISBN: (数字)9781510625907

ISBN: (纸本)9781510625891;9781510625907

The auxetic meta-material is a special class of macro-structure designed for exhibiting negative Poisson's ratio. The spatial repetition of the lattice affects the wave propagation and dynamic responses. In this study, a mathematical basis of Bloch analysis for auxetic media have been presented and shaded some important light on the application of the technique. For this design an analysis has been carried out to show how the periodic boundary condition changes with the connectivity, orientation and geometry of unit lattice. The corresponding eigen value problem is developed to obtain the propagation frequency which is the function of mass, stiffness matrix and the wave vector. Mapping of different forms which are associated with the nodal displacements of a unit cell to adjacent cell have been demonstrated and formulated mathematically and observed its effect on the reduced stiffness and mass matrices is studied. Modal analysis has been carried out using Abaqus 6.14 and the transverse nodal displacements obtained from the F.E analysis. The Bloch formulation for revolving-square type auxetic structure has been formulated and validated. Further, we have obtained the changes in auxetic behavior of the structure under different boundary conditions. The periodicity of a given lattice assists in determining the frequency bands within which the propagation of elastic waves is permitted. Further study is proposed for attenuation and transmission band analysis to steer the waves which roots the idea of vibration sink, in which we can damp the mechanical waves effectively at a specific location. The Auxetic meta-materials is envisaged to have a significant role in wave attenuation and wave steering, and can be used effectively for vibration control.

关键词： Auxetic meta-material Bloch analysis Vibration sink passive vibration control Finite element analysis wave Poisson's ratio

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Adaptive damping and stiffness control of composite structures: an experimental illustration 12

Adaptive damping and stiffness control of composite structur...

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conference on active and passive smart structures and integrated systems XII

作者： Verdin, B. Renault, D. Butaud, P. Ouisse, M. Joseph, E. Jeannin, T. Foltete, E. Chevallier, G. Sadoulet-Reboul, E. Univ Bourgogne Franche Comte FEMTO ST Inst Dept Appl Mech CNRSUFCENSMM 24 Rue Epitaphe F-25000 Besancon France

ISBN: (数字)9781510625907

ISBN: (纸本)9781510625891;9781510625907

Viscoelastic materials are widely used to control vibrations. However, their mechanical properties are known to be frequency and temperature-dependent. Thus, in a narrow frequency bandwidth, there is an optimal temperature that corresponds to a maximum loss factor and it is tricky to get a high damping level over a wide frequency range. Furthermore, an optimal temperature for a maximum structural damping leads to a low static stiffness because the peak of the loss factor is obtained during the glass transition when the storage modulus is decreasing. In order to obtain a compromise between stiffness and damping it is suggested to use a viscoelastic material which properties are functionally graded thanks to a non-uniform temperature field over the structure. In this work, a composite structure has been designed integrating a viscoelastic core and a heat control device. The optimal temperature field has been obtained through the minimization of a cost function that reflects the compromise between structural damping over a wide frequency band and high static rigidity. The experimental validation has been performed on a reduced scale airplane model: the composite wings are sandwich structures made of aluminum skins and a viscoelastic core in tBA/PEGDMA with a non-uniform temperature field and skins are in an aluminum and FR-4. A broadband excitation is produced with a shaker and the measurements are performed with a set of accelerometers. Several temperature fields are tested. The frequency response functions show the compromise obtained between static and dynamic behaviors when using the optimal temperature field determined by numerical simulation.

关键词： Adaptive damping adaptive stiffness temperature control shape memory polymer

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Development of a Conceptual Demonstrator of a SMA-based Rotorcraft Blade Twist System 9

Development of a Conceptual Demonstrator of a SMA-based Roto...

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conference on Bioinspiration, Biomimetics, and Bioreplication ix, held at SPIE smart structures + Nondestructive Evaluation

作者： Ameduria, Salvatore Concilio, Antonio Galasso, Bernardino Gianvito, Antonio Italian Aerosp Res Ctr CIRA Adapt Struct Div I-81043 Capua CE Italy

ISBN: (数字)9781510625860

ISBN: (纸本)9781510625853;9781510625860

Blade geometry and stiffness variations lead to advantages that have been proved in several fields, from aerospace to turbomachinery. The advent of innovative materials as Shape Memory Alloys (SMA), have allowed non-conventional design approaches, targeting adaptive, smooth and extensive modifications of aerodynamic shapes and local stiffness. The Project "Shape Adaptive Blades for Rotorcraft Efficiency" (SABRE) within the EU program H2020, has the main objective of maturing blade morphing technologies and related processes, moving from the assessment of predictive codes integrated with novel philosophies of geometry alterations, till experimental validation within lab and wind tunnel environments. In this paper, an SMA demonstrator for active twist is proposed, aimed at modulating spanwise blade torsion angle for rotorcraft performance improvement. The idea is to combine the reference structure with embedded torque actuators. Quasi-steady operations are targeted because of the low frequency bandwidth of the addressed devices (under 1 Hz). Thus, single flight regimes are considered (hover, climb, forward flight). Actuation authority is a critical aspect for the proper design of that system. It is influenced by many geometrical and physical parameters like the cross section geometry or the materials Young modulus. The presented demonstrator is made of three main elements: an SMA rod system, structural elements representative of the blade body stiffness, and the connecting fixtures. An experimental campaign is carried out to verify the relations among alloys activation temperatures, induced stiffness levels, and forces and installation angles (pre-twist).

关键词： Adaptive twist Shape Memory Alloys Rotorcraft blades smart structures integrated system design Load-bearing actuator systems Rotorcraft performance Experimental validation

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integrated photonics put at full stretch: flexible and stretchable photonic devices enabled by optical and mechanical co-design 11

Integrated photonics put at full stretch: flexible and stret...

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conference on smart Photonic and Optoelectronic integrated Circuits XXI

作者： Li, Lan Lin, Hongtao Qiao, Shutao Huang, Yizhong Li, Junying Michon, Jerome Alonso-Ramos, Carlos Vivien, Laurent Yadav, Anupama Richardson, Kathleen Lu, Nanshu Gu, Tian Hu, Juejun MIT Dept Mat Sci & Engn Cambridge MA 02139 USA Univ Texas Austin Dept Aerosp Engn & Engn Mech Austin TX 78712 USA Xiamen Univ Dept Elect Engn Xiamen Peoples R China Chongqing Univ Educ Minist China Key Lab Optoelect Technol & Syst Chongqing Peoples R China Univ Paris Saclay Univ Paris Sud C2N Orsay Ctr Nanosci & NanotechnolCNRS Orsay France Univ Cent Florida Coll Opt & Photon Orlando FL 32816 USA

ISBN: (纸本)9781510624870

We present recent development on integrated flexible and stretchable photonic devices. Conventional photonic devices are fabricated on rigid semiconductor or dielectric substrates and are therefore inherently incompatible with soft biological tissues. Recently, we have developed a suite of active and passive photonic devices and systems integrated on plastic substrates which can be bent, twisted, and stretched without compromising their optical performance. Key innovations are monolithic multi-material integration and advanced micro-mechanical structures co-designed with photonic devices, which enables devices with extreme mechanical flexibility and excellent optical performance.

关键词： integrated optics devices Optical resonators Waveguides Flexible photonics

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Observations on the Behavior of Discretely Modulated Spatiotemporal Periodic structures 12

Observations on the Behavior of Discretely Modulated Spatiot...

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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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Bio-inspired hybrid vibration control methodology for intelligent isolated bridge structures 12

Bio-inspired hybrid vibration control methodology for intell...

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conference on active and passive smart structures and integrated systems XII

作者： Soto, Mariantonieta Gutierrez Univ Kentucky 161 Oliver H Raymond Bldg Lexington KY 40506 USA

ISBN: (数字)9781510616875

ISBN: (纸本)9781510616875

Inspired by evolutionary game theory, the biological game of replicator dynamics is investigated for vibration control of bridge structures subjected to earthquake excitations. Replicator dynamics can be interpreted economically as a model of imitation of successful individuals. This paper uses replicator dynamics to reduce vibrations while optimally allocating the control device forces. The control algorithm proposed is integrated with a patented neural dynamic optimization algorithm to find optimal growth rate values with the goal of achieving satisfactory structural performance with minimum energy consumption. A model is described for hybrid vibration control of smart highway bridge structures subjected to earthquake loading.

关键词： Game theory smart structures vibration control replicator dynamics bio-inspired bridge earthquake

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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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