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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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Forward and Inverse Design of Programmable Surfaces from Knitted active Textiles 15

Forward and Inverse Design of Programmable Surfaces from Kni...

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conference on active and passive smart structures and integrated systems XV

作者： Mahabaleshwarkar, Atharva Harris, Evan Abel, Julianna Univ Minnesota Dept Mech Engn Design Act Mat & Struct Lab 111 Church St Minneapolis MN 55455 USA

ISBN: (数字)9781510640061

ISBN: (纸本)9781510640061

Programmable surfaces and structures are mechanisms that transition between two or more geometric configurations. Programmable surfaces capable of altering their topology with a change in operational conditions have the potential to enable a wide range of applications in a variety of domains like haptics, wearables, human-computer interactions, fluid-surface interactions, and shape morphing structures. Prior research on programmable surfaces has developed various techniques to realize shape change applications. 4D printing includes multi-material printing of mechanisms that transform from any 1D or a 2D shape into a 3D shape using simple energy inputs like heat, water, or light. Additionally, origami composite structures with selective actuation of shape memory polymers also afford complex shape changes. We present a novel approach to designing programmable surfaces by incorporating shape memory alloys (SMA) and textile manufacturing processes to form variable topology programmable surfaces from knitted active textiles. Thermally responsive shape memory alloys (SMAs) leverage solid-state phase transformations and the shape memory effect to return the material to a predetermined state upon heating. The shape memory effect enables creation of multi-stiffness SMA configurations that can be utilized to develop structures with tunable surface topographies. active knitted textiles act as programmable surfaces by transforming from an inactive 2D flat surface in the cold, flexible martensite state into active 3D surfaces when heated above the austenite finish transformation temperature.

关键词： Shape Memory Alloys Programmable Surfaces active Textiles

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Experimental investigation of the delamination severity in a composite plate using NDT and SHM techniques 15

Experimental investigation of the delamination severity in a...

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conference on active and passive smart structures and integrated systems XV

作者： Migot, Asaad Ethaib, Saleem Giurgiutiu, Victor Thi Qar Univ Coll Engn Nasiriyah Iraq Univ South Carolina Columbia SC 29208 USA

ISBN: (数字)9781510640061

ISBN: (纸本)9781510640061

The invisibility behavior of initiation and growing a delamination in an aerospace structure makes it one of the most dangerous and catastrophic damages. In this paper, the non-destructive testing (NDT) and structural health monitoring (SHM) techniques were used to visualize and quantify three different sizes of simulated delaminations inserted in a crossply CFRP plate. An experiment of using RollerFORM and OmniScan equipment was conducted to verify and visualize three simulated delaminations. The guided waves-based developed imaging methods with a sufficient network of piezoelectric wafer active sensors was performed to quantify the shape and size of simulated delaminations. The groupvelocity directivity plots were determined based on the mechanical properties of the interested specimen to estimate the group velocity values of incident and scattered waves. A simple method was developed to estimate the group velocity values of incident and scattered waves at each point of interested area based on the group-velocity directivity plots of propagating Lamb modes and the coordinates of transmitter and receiver transducers. The results demonstrate the capability of the developed imaging method for quantifying the size and shape of interested delaminations. The interaction of guided waves with delaminations were visualized experimentally using scanning laser Doppler vibrometer (SLDV). The effect of the delamination severity on the trapped waves generated over the delamination region was studied experimentally. It was found that delamination size can affect trapped waves. The large delamination has strong trapped waves compared with the small delamination which has weak trapped waves. The wavenumber analysis was conducted for the experimental wavefield data to study the effect of delamination severity on wavenumber components and to identify the delaminations. The result showed that new wavenumber components can affected by the delamination severity. The significant new wav

关键词： Structural health monitoring guided wave wavenumber analysis composites piezoelectric wafer active sensors

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Design of a morphing test-article for large-scale, high-speed wind tunnel tests of an adaptive wing flap 15

Design of a morphing test-article for large-scale, high-spee...

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conference on active and passive smart structures and integrated systems XV

作者： Pecora, Rosario Amoroso, Francesco Sicim, Muruvvet Sinem Univ Naples Federico II Dept Aerosp Engn Naples Italy Istanbul Tech Univ Dept Aeronaut Engn Istanbul Turkey

ISBN: (数字)9781510640061

ISBN: (纸本)9781510640061

Large efforts are currently being spent in Europe for the maturation of innovative technologies enabling the application of morphing systems on next-generation civil transport aircraft. Running along with the CleanSky2 platform, the AirGreen2 project aims to evolve the proofs of concept addressed during the CleanSky program into true-scale demonstrators for a more comprehensive validation of morphing architectures both on the ground and in flight. In this challenging framework, research activities have been carried out to design a novel multi-modal camber morphing flap for the enhancement of the aerodynamic performances of a new-generation regional aircraft. Referring to CFD analyses, very relevant benefits in terms of CLmax increase and stall angle delay were proved to be achievable by properly morphing the camber of the flap;the extra-lift produced by flap cambering resulted more than adequate to allow for takeoff and landing at a single flap deployment angle, in turn much lower than those required by a standard flap in both settings. As a side positive effect, a dramatic simplification of the flap deployment system was shown to be practicable, together with the adoption of fairing-less (no-drag) solutions with flap tracks fully embedded into the wing. In addition, wing aerodynamic efficiency in cruise was demonstrated to be enhanced by locally morphing the tip of the flap still exposed to the aerodynamic flow in flap-retracted configuration. The design and validation of the smart architecture enabling the different morphing modes required for low speed (take-off / landing) and high speed (cruise) conditions, consisted of a complex process involving both wind tunnel and ground tests. To increase the relevance of the wind tunnel test campaign, a large scale-factor (1:3) was selected for the test-article, in combination with the realization of the very same Mach numbers expected in flight. Standing the un-scalability of the flap architecture conceived for ground tes

关键词： morphing structures morphing aircraft morphing flap finger-like ribs mechanical systems large aeroplanes industrial standards wind tunnel tests large scale morphing architectures

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Circuit integration and Road test of Self tuning Stochastic Resonance Energy Harvesters for smart Tire 9

Circuit integration and Road test of Self tuning Stochastic ...

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conference on active and passive smart structures and integrated systems ix

作者： Kim, Hongjip Jung, Hyunjun Zuo, Lei Virginia Tech Dept Mech Engn Blacksburg VA 24060 USA

ISBN: (数字)9781510635302

ISBN: (纸本)9781510635302

Many researchers have been focused on energy harvester for the tire over the past decade. In this paper, we propose a self-tuning stochastic resonance energy harvester for a smart tire with the circuit integration. Compared to existing harvesters, the energy harvester shows large power and wide bandwidth due to stochastic resonance and passive selftuning. The harvester consists of an inward rotating cantilever beam with an electromagnetic transducer. The tuning performance is verified by analysis of Kramers rate and signal-to-noise ratio (SNR). In addition to energy harvester, we implemented the energy harvesting circuit to achieve data acquisition and energy storage. Circuit includes a rectifier, buck-boost converter, wireless communication module, microprocessor and temperature monitoring sensor. In lab test and field test are conducted to performance of self-tuning energy harvester. Circuit assembly is attached to the rim hub while harvester assembly is installed inside the tire with a tire pressure monitoring sensor (TPMS). The results the feasibility of the self-tuning harvesting strategy on the smart tire application.

关键词： Energy harvesting Modulated noise Self tuning stochastic resonance

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Surrogate-based Performance Evaluation Strategy for High Performance Control systems under Uncertainties 9

Surrogate-based Performance Evaluation Strategy for High Per...

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conference on active and passive smart structures and integrated systems ix

作者： Micheli, Laura Cao, Liang Laflamme, Simon Catholic Univ Amer Dept Civil & Environm Engn Washington DC 20064 USA Lehigh Univ ATLSS Engn Res Ctr Bethlehem PA USA Iowa State Univ Dept Civil Construct & Environm Engn Ames IA USA

ISBN: (数字)9781510635302

ISBN: (纸本)9781510635302

High-performance control systems (HPCSs) are sophisticated vibration mitigation strategies that include active, semi-active and hybrid systems. They generally outperform passive supplemental damping systems by relying on a feedback mechanism enabling adaptability, resulting in better control reachability over a wide excitation frequency bandwidth. HPCSs are therefore ideal for multi-hazard mitigation. However, the performance of these systems is highly dependent on the controller design, which requires appropriate tuning based on assumptions or on knowledge of dynamic parameters, long-term performance of sensors, excitations, etc. The quantification of performance based on possible uncertainties on such assumptions and/or knowledge could be a powerful tool in financially or technically justifying the use of an HPCS, or simply to benchmark the long-term performance of a given control algorithm. This paper investigates a methodology to assess the performance of control algorithms under various sources of uncertainties. To reduce the computational demand of the uncertainty quantification process, surrogate models are employed to map the nonlinear relationship between structural response and controller configurations. Long-term performance is quantified using life-cycle cost analysis. The investigation is conducted on a 39-story building, located in Boston (MA), and equipped with a set of semi-active friction devices. Results demonstrate that the proposed framework can be used to assess the performance of a given control algorithm considering various sources of uncertainties.

关键词： Kriging semi-active control control uncertainties surrogate model life-cycle cost vibration mitigation

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Numerical investigation towards the control of flexural waves using structural intensity for an active barrier of structure-borne sound 9

Numerical investigation towards the control of flexural wave...

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conference on active and passive smart structures and integrated systems ix

作者： Kokott, Alexander Monner, Hans Peter Haase, Thomas German Aerosp Ctr Lilienthalpl 7 Braunschweig Germany

ISBN: (数字)9781510635302

ISBN: (纸本)9781510635302

Noise is often generated in different parts of a structure than where it is perceived, e.g. cabin noise caused by engine or APU of aircraft. passive materials can reduce noise, but are mainly effective in a higher frequency range and require additional mass. active systems in turn address low frequency noise, targeting different measures (sound pressure, vibration velocity, radiated sound power). Another approach is the focus on structural intensity (SI), i.e. transmitted power per unit area. Hereby, an active barrier for structure-borne sound can attenuate the downstream structure and avoid noise emission. Therefore, a real-time measurement of SI is crucial. It can be estimated using accelerometer arrays with different levels of simplifications. The presented numerical study assesses these methods, addressing the actuator and error sensor placement on a plate structure. A linear feed-forward filter is implemented, hence the SI it is split into its linearly dependent components. The necessary amount of control forces and virtual error sensors is assessed, with respect to dependencies on wavelength and the type of SI components. The study shows an advantage of SI control compared to a conventional velocity control. A small number of error sensor positions and actuators can achieve a higher global attenuation. Simplified and more robust methods for SI estimation are favorable for a practical implementation. For example by controlling only velocity and angular rate or bending moments, a rather high attenuation can be achieved.

关键词： noise barrier active vibration control structural intensity

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The Influence of Geometry on Origami's Deployment Dynamics 9

The Influence of Geometry on Origami's Deployment Dynamics

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conference on active and passive smart structures and integrated systems ix

作者： Xia, Yutong Kidambi, Narayanan Agarwal, Vipin Wang, K. W. Univ Michigan Dept Mech Engn Ann Arbor MI 48109 USA

ISBN: (数字)9781510635302

ISBN: (纸本)9781510635302

This research investigates the effect of the geometric parameters of origami crease patterns on their deployment dynamics. In this study, we construct a dynamic model of a non-rigid Miura origami sheet based on the bar-and-hinge approach, capturing panel flexibility and inertial effects. These effects are critical in describing the dynamics of origami deployment, which are ignored in the state of the art rigid folding kinematics model. Deployment is facilitated by strain energy stored in the torsional springs at the hinged creases, and a controlled deployment velocity at one end of the Miura sheet. We theoretically and numerically analyze the deployment process of integrated Miura sheets with various geometries. Eigenvalue decomposition at different stages during the quasi-static deployment process shows that the Miura pattern's crease length ratio and panel section angle affect the fundamental natural frequency and damping ratio. Numerical studies show that changing the crease pattern geometries results in deployment paths that may substantially deviate from a nominal Miura unfolding path under rigid folding assumptions. Examination of the theoretical model reveals how crease pattern geometries affect the apparent stiffness, offering insight into this behavior. The findings of this research enable a deeper understanding of the physics behind origami deployment and pave the way for new applications of origami-based deployable structures.

关键词： Origami structures deployment dynamics geometry

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An integrated design approach of piezoelectric vibration energy harvesters 9

An integrated design approach of piezoelectric vibration ene...

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conference on active and passive smart structures and integrated systems ix

作者： Liao, Yabin Cheng, Huanyu Penn State Univ Behrend Coll Dept Mech Engn Technol Erie PA 16563 USA Penn State Univ Dept Engn Sci & Mech University Pk PA 16802 USA

ISBN: (数字)9781510635302

ISBN: (纸本)9781510635302

Due to its multidisciplinary nature, the power behavior of a piezoelectric vibration energy harvester depends on system properties in multiple domains such as material, mechanical and electrical. This paper presents a dimensionless maximum power equation that integrates these effects into a simple model, which serves as a convenience tool for the design and analysis of piezoelectric vibration energy harvesters. The model is given as a closed-form relationship between the dimensionless maximum power (maximum power normalized by the power limit) and the normalized electromechanical coupling coefficient with respect to the critical coupling coefficient, which is the minimum coupling to reach the power limit of a system. In addition, this integrated design equation can be applied to different energy harvesting interface circuit types such as resistive and standard AC-DC with a simple change of the critical coupling expression in the equation. The application of this equation is illustrated by a detailed design example of a bimorph beam harvester for fixed target natural frequency and length given a base motion excitation. It is found that under the same level of excitation, there is an optimal PZT thickness for maximum power. In addition, overall, it is beneficial to make the system of low damping to yield a larger structural response and more power. However, this also leads to a higher bending stress, which is an important design consideration due to the relatively brittle nature of PZT materials.

关键词： Piezoelectric Energy harvesting Design and optimization Maximum power Electromechanical coupling Optimal thickness AC-DC

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Effect of negative capacitance circuits on the performance of the piezoelectric nonlinear energy sink 9

Effect of negative capacitance circuits on the performance o...

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conference on active and passive smart structures and integrated systems ix

作者： Mosquera-Sanchez, Jaime A. De Marqui, Carlos, Jr. Univ Sao Paulo Dept Aeronaut Engn Sao Carlos Sch Engn Av Joao Dagnone 1100 BR-13563120 Sao Carlos Brazil

ISBN: (数字)9781510635302

ISBN: (纸本)9781510635302

The nonlinear energy sink (NES) is becoming increasingly accepted as a promissory noise and vibration technique, mainly due to its multi-mode reduction capability and its improved robustness. To realize an NES, however, sophisticated arrangements and sub-systems have to be implemented in the structure to be controlled. For instance, in slender, elastic structures treated with piezoelectric attachments, the need for canceling the linear term that accounts for the stiffness in the electrical domain makes the use of so-called negative capacitance (NC) circuits to be compulsory. In this line, this paper scrutinizes the effects of negative capacitance circuits on the residual piezoelectric capacitance and the electromechanical coupling term. In special, the effects of the linear S and H circuits are thoroughly examined through numerical investigations, based on a finite element of a piezoelectric plate, on which a pair of piezoelectric patches have been placed on top and bottom of a cantilevered aluminum structure. Whilst the S circuit leaves a residual positive capacitance in the electrical domain of the system, the H circuit realizes a residual negative capacitance with which the effect and benefits of adding a nonlinear cubic force in the system become apparent. The numerical results also show that the multi-mode performance of the piezoelectric NES can be significantly improved by reducing the mass term of the electrical domain to an infimum fraction of the inductance previously tuned using a linear resistance-inductance (RL) reference circuit. The piezoelectric NES is eventually submitted to a number of elastic system de-tuning scenarios, from which its robustness against environmental perturbations has been verified.

关键词： smart structures piezoelectric nonlinear energy sink negative capacitance shunt circuit nonlinear shunt circuit

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Aircraft Morphing systems: Elasticity of Selected Components and Modelling Issues 9

Aircraft Morphing Systems: Elasticity of Selected Components...

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conference on active and passive smart structures and integrated systems ix

作者： Concilio, A. Dimino, I Pecora, R. Arena, M. CIRA Adapt Struct Div Italian Aerosp Res Ctr I-81043 Capua Italy Univ Napoli Federico II Ind Engn Dept Aerosp Div I-80125 Naples Italy

ISBN: (数字)9781510635302

ISBN: (纸本)9781510635302

Morphing is an increasingly investigated topic in aeronautics due to the performance improvements brought by aerodynamic shapes adaptivity on large aircraft. Being aerodynamics mainly driven by geometry, a structure that can modify its shape may achieve tremendous capability enhancement, especially if its operating scenario is wide. However, the implementation of morphing structures leads to many issues that still need to be properly solved to make the technology fully operative in real application scenarios. For instance, additional DOFs generate systems with increased modal density and then with more complex aeroelastic behaviour, and premature onset of dynamic instabilities. The authors of the present paper have dealt with this problem in other publications, in cooperation with several colleagues, and interesting results are available in literature, to some extent. In this general framework, there are peculiar aspects that only recently have started to catch the attention of the scientific community. Among those, a particular one is the objective of the present work, referring to the numerical simulation strategy of adaptive devices. The kinematic system at the basis of a wide class of morphing structures is driven by an actuation chain, which gives an important contribution to the already cited aeroelastic behaviour. For safety-critical embedded subsystems, it is crucial to detect potential failures and predict their impacts since the early design stages. Now, kinematic components significantly affecting the structural dynamics, as torsion bars and bearings, are assumed rigid in the traditional simulation strategy. If such a concept may be supposed valid for standard layouts (as in the case of flap, ailerons and other moveable systems), it cannot be held for architectures integrating hundreds of those mechanical parts. This work addresses preliminary investigations on systematic analyses carried out on detailed simulations of selected components of aircraft morp

关键词： morphing systems adaptive structures embedded kinematics mechanisms elasticity finger-like tabs nonlinear modelling

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