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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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A passive Self-Tuning Nonlinear Resonator with Beam-Slider Structure 12

A Passive Self-Tuning Nonlinear Resonator with Beam-Slider S...

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conference on active and passive smart structures and integrated systems XII

作者： Yu, Liuding Tang, Lihua Xiong, Liuyang Yang, Tiejun Mace, Brian R. Harbin Engn Univ Power & Energy Engn Coll Harbin 150001 Heilongjiang Peoples R China Univ Auckland Dept Mech Engn Auckland 1010 New Zealand

ISBN: (数字)9781510625907

ISBN: (纸本)9781510625891;9781510625907

This work investigates the interaction between a nonlinear slender clamped-clamped beam and a freely movable mass during the passive self-tuning process. The experimental and numerical results illustrate that the hardening nonlinearity caused by the beam stretch strain can broaden the frequency bandwidth. When the amplitude and curvature of the beam at the slider location are large enough, the slider could be driven to move from the side towards the centre and stop around the centre. The slider's movement, in turn, changes the beam-slider structure's mass distribution that shifts the frequency response functions to the lower frequency range. During this interaction between the beam and slider, the high energy orbit could be captured with amplified vibration response. Because the slider is driven by the beam vibration, the self-tuning process does not require external energy. Such a beam-slider structure could be used for the design of nonlinear energy harvesting system with the capability of passive self-tuning to acquire large amplitude vibration and thus higher efficiency.

关键词： Nonlinear resonator beam-slider structure passive self-tuning

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Magnetorheological bypass valve design for a semi-active inerter 12

Magnetorheological bypass valve design for a semi-active ine...

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conference on active and passive smart structures and integrated systems XII

作者： Tipuric, Matthew Wagg, David Sims, Neil Univ Sheffield Ind Doctorate Ctr Machining Sci Adv Mfg Res Ctr Boeing Rotherham S60 5TZ S Yorkshire England Dept Mech Engn Sir Frederick Mappin BldgMappin St Sheffield S1 3JD S Yorkshire England

ISBN: (数字)9781510625907

ISBN: (纸本)9781510625891;9781510625907

Inerters are a class of vibration absorber which create a resistive force proportional to the relative acceleration across their two terminals. It has been previously shown that it is possible to create an inerter where the size of this force is variable, through use of a bypass channel controlled by a magnetorheological (MR) valve. However, the requirements and restrictions of such a device mean that existing design methodologies are insufficient. For example, as the pressure drop in the rest of the device is dependent on both the geometry of the device and the velocity of the fluid, it is important to design the valve with this in mind, in order to maximise the control range of the entire device, rather than just the valve itself. This work considers the effects of varying the dimensions of a valve and presents a performance metric to be used to allow comparison of different designs. The results are demonstrated as part of a model of a fluid inerter system.

关键词： Magnetorheological fluid inerter semi-active damper valve

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Direct Adaptive Control of Non-Minimum Phase Linear Distributed Parameter Models of Large Flexible structures 12

Direct Adaptive Control of Non-Minimum Phase Linear Distribu...

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conference on active and passive smart structures and integrated systems XII

作者： Balas, Mark J. Frost, Susan A. Univ Tennessee Inst Space Mech Aerosp & Biomed Engn Dept Tullahoma TN 37388 USA NASA Ames Res Ctr Intelligent Syst Div POB 1M-S 269-3 Moffett Field CA 94035 USA

ISBN: (数字)9781510625907

ISBN: (纸本)9781510625891;9781510625907

Linear Distributed Parameter systems are governed by partial differential equations. They are linear infinite dimensional systems described by a closed, densely defined linear operator that generates a continuous semigroup of bounded operators on a general Hilbert space of states and are controlled via a finite number of actuators and sensors. Many distributed applications are included in this formulation, such as large flexible aerospace structures, adaptive optics, diffusion reactions, smart electric power grids, and quantum information systems. Using a recently developed normal form for these systems, we have developed the following stability result: an infinite dimensional linear system is Almost Strictly Dissipative (ASD) if and only if its high frequency gain CB is symmetric and positive definite and the open loop system is minimum phase, i.e. its transmission zeros are all exponentially stable. In this paper, we focus on infinite dimensional linear systems that are non-minimum phase because a finite number of transmission zeros are unstable. Several methods to compensate for this issue modify the output of the infinite dimensional plant and then control this modified output rather than the original control output. Here we use a finite dimensional residual mode filter to modify the output to produce a fully minimum phase system. Then direct adaptive control for the infinite dimensional plant can use this modified output rather than the original output, to achieve ASD and produce asymptotically stability of the states on the Hilbert space. These results are illustrated by application to direct adaptive control of general linear systems on a Hilbert space that are described by operators with compact resolvent.

关键词： Distributed Parameter systems Flexible Mechanical structures Adaptive Control systems

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active mass damper using phase and amplitude of mean field of oscillators 12

Active mass damper using phase and amplitude of mean field o...

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conference on active and passive smart structures and integrated systems XII

作者： Hongu, J. Iba, D. Wada, T. Tottori Univ Minami Ku 4-101 Koyama Cho Tottori Japan Kyoto Inst Technol Sakyo Ku Goshokaido Cho Kyoto Japan

ISBN: (数字)9781510625907

ISBN: (纸本)9781510625891;9781510625907

This study shows an active vibration control using a phase and an amplitude of a mean field of oscillators. Recently, we have proposed an active mass damper (AMD) system using a neural oscillator, which can flexibly synchronize with a target structure's vibration response. In the proposed system, a neural system including a single oscillator and a position controller form the controller: the neural system generates a target path of an auxiliary mass of the AMD and then, the auxiliary mass is position controlled to the target path to absorb the vibration energy of the structure. However, the oscillator could unfortunately include a non-linear response when the frequency of the periodical input is dramatically different from the oscillator's eigen frequency. To suppress the undesirable single component of the control signal, this study will use the phase and the amplitude information of an arithmetic mean of the oscillators for the target path of the auxiliary mass of the AMD. Cleaning the control signal could improve an input-output stability of the proposed system and enable to vibration control a specific vibration mode of a multi-degree-of-freedom system such as high-rise buildings.

关键词： active Mass Damper Neural Oscillator Mean Field Multi-Layer Network

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Flutter analysis of a large civil aircraft in case of free-plays and internal failures of morphing wing flaps mechanical systems 12

Flutter analysis of a large civil aircraft in case of free-p...

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conference on active and passive smart structures and integrated systems XII

作者： Pecora, Rosario Amoroso, Francesco Dimino, Ignazio Concilio, Antonio Univ Naples Federico II Dept Ind Engn Aerosp Div Via Claudio21 I-80125 Naples Italy CIRA Italian Aerosp Res Ctr Smart Struct Lab Via Maiorise I-80134 Capua CE Italy

ISBN: (数字)9781510625907

ISBN: (纸本)9781510625891;9781510625907

The adoption of mechanical systems represents a very promising solution to realistically enable wing-camber morphing for large civil aircraft. These systems implement the change of shape through the relative motion of parts usually interconnected by means of hinges, and therefore, without any morphing-induced elastic deformation of the load carrying structure;conversely to what happens in compliant structures, the energy provided by the actuation system is here spent to counteract only the external aerodynamic loads which are in turn dependant on shape, speed and flight altitude. Apart of the more effective use of the available power, the mechanical systems show a higher level of technological maturity and readiness for flight thanks to their higher robustness, reliability and maintainability, as well as in force of their similarity with conventional airworthy architectures already in flight. On the other hand, the use of multiple-hinges connections imposes a careful analysis of the effects induced by any degradation of their mechanical performance leading to overall system malfunction or local failures. In the framework of the CleanSky2, a research program in aeronautics among the largest ever founded by the European Union, the authors focused on the design and validation of a camber-morphing flap specifically tailored for EASA CS-25 category aircraft. The shape transition is obtained through a smart architecture based on segmented (finger-like) ribs with embedded electromechanical actuators. Three large tabs were located at the flap trailing edge to actively control the shape of the wing in cruise and to optimize the aerodynamic load distribution along the span. Aeroelastic phenomena related to these flap components were duly addressed since the very preliminary design stage in order to avoid the maturation of a potentially unstable architecture;rational approaches compliant with applicable airworthiness requirements were implemented to properly model and investig

关键词： morphing structures morphing flap finger-like ribs mechanical systems aeroelasticity large aeroplanes industrial standards airworthiness requirements free-plays failures

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Piezoelectric wafer active sensors for sensing acoustic emission due to crack rubbing/clapping 12

Piezoelectric wafer active sensors for sensing acoustic emis...

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conference on active and passive smart structures and integrated systems XII

作者： Joseph, Roshan Bhuiyan, Md Yeasin Giurgiutiu, Victor Univ South Carolina Dept Mech Engn Columbia SC 29208 USA

ISBN: (数字)9781510625907

ISBN: (纸本)9781510625891;9781510625907

Crack rubbing or clapping in metallic structures generates acoustic emission (AE) signals. Such AE signals need to be distinguished from AE signal due to fatigue crack growth event. AE signal due to crack rubbing or clapping of fatigue generated crack was studied for a plate specimen. 20 mm fatigue crack was generated in a 1 mm thick aluminum plate specimen. Vibration-induced excitation was performed on the specimen to induce crack faying surface-motion for AE signal generation. Various specimen resonances have different crack faying surface motions, which were studied from FEM analysis. Modeshapes and crack faying surface motions of the specimen are studied at 35 Hz and 180 Hz specimen resonances. AE signals at various specimen resonances were recorded by piezoelectric wafer active sensors (PWAS) and the recorded waveforms are analyzed to obtain AE signatures. At various specimen resonances, AE signals have different signatures due to the change in crack faying surface motions. AE recording was done by using multiple PWAS sensors placed at various distances from the crack. The difference in AE signals close to crack and distant from crack as well as the geometric spreading of AE signals originating due to crack rubbing was studied from multi-sensor experiments.

关键词： Acoustic emission Finite element methods active sensors Semiconducting wafers Aluminum Modal analysis Sensors Source localization active remote sensing

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Design and modeling of surface bondable piezoelectric stack actuators for actuation of large structures 12

Design and modeling of surface bondable piezoelectric stack ...

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conference on active and passive smart structures and integrated systems XII

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

ISBN: (数字)9781510625907

ISBN: (纸本)9781510625891;9781510625907

In this work, the notion of using surface bondable piezoelectric actuators, which directly use the "33" electromechanical coupling, for actuating large structures is investigated. This concept was a result of the attempt to control the vibrations of a steel marine platform with piezoelectric actuators. Piezoelectric actuators find applications both in the excitations of membrane-like structures, wherein thin patches are bonded to the surface of the substructure to, and in the excitation of large structures, where piezoelectric stack actuators are conventionally employed akin to an electrodynamic exciter with stringer -to provide transverse loading. For the case of the actuation of the marine platform, the use of the piezoelectric stack actuators in a conventional manner could not be suggested for implementation on the actual structure due to its associated drawbacks. As an alternative, the concept of the surface bondable piezoelectric stack actuators was proposed. This design allows the stack actuators to be bonded to the surface of the structure (like a patch), and just like the patches, on the application of an external electric field would generate axial forces on the surface of the structure. In this study, the design of such an actuator is elaborated;following which, an analytical model is derived for beams with surface-bonded stack actuators. The analytical model is derived for the bending vibrations of the structure, and is used to investigate the necessity of the design and the actuation capability of the surface-bondable stacks. The actuation capability of the surface bondable stacks are compared with the actuation capability of other stack implementations, and with similar sized piezoelectric patches. Finally, experimental evidence is provided to demonstrate the practicality of the design.

关键词： d(33)-mode surface bonded actuator piezoelectric stack actuators marine platforms piezostack-beams

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Study of piezo embedded negative mass metamaterial using generalized Bloch theorem for energy harvesting system 12

Study of piezo embedded negative mass metamaterial using gen...

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conference on active and passive smart structures and integrated systems XII

作者： Dwivedi, Ankur Banerjee, Arnab Bhattacharya, Bishakh Indian Inst Technol Kanpur Dept Mech Engn Smart Mat Struct & Syst Lab Kanpur 208016 Uttar Pradesh India Indian Inst Technol Jammu Dept Civil Engn Jammu 181221 Jammu & Kashmir India

ISBN: (数字)9781510625907

ISBN: (纸本)9781510625891;9781510625907

Dynamics of periodic structures has fascinated researchers for decades. Metamaterials are one of the exemplars of these periodic structures. Spatial periodicity of mechanical unit cells in artificially engineered metamaterials exhibits idiosyncratic physical properties like negative mass, negative Young's modulus, and negative Poisson's ratio. These extreme physical properties are beyond the properties found in the natural materials. This exceptional dynamic behaviour is frequency dependent, which in turn forms the attenuation and transmission band during wave transmission through these metamaterials. The frequency ranges in which a wave can transmit or attenuate along the length of the metamaterial are known as transmission and attenuation bands respectively. In this work, the band structure of piezo-embedded negative mass metamaterial is analysed using generalized Bloch theorem. The addition of the piezoelectric material at the resonating unit increases the damping and complexity of the solution. Bloch theorem is used to solve several periodic media and using this theory, the relationship between frequency and wavenumber can be established. Implementation of Bloch theorem has not been reported yet in the context of the piezo embedded mass-in-mass metamaterial. Therefore, wave propagation through finite units is studied through band structure. In addition, voltage and power produced by piezoelectric material are estimated. This research can be considered as the first step towards modelling an active metamaterial.

关键词： Metamaterial negative mass generalized Bloch theorem piezoelectric material

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Effect of Hinge Elasticity on Morphing Winglet Mechanical systems 12

Effect of Hinge Elasticity on Morphing Winglet Mechanical Sy...

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conference on active and passive smart structures and integrated systems XII

作者： Concilio, Antonio Dimino, Ignazio Pecora, Rosario Arena, Maurizio Italian Aerosp Res Ctr CIRA Adapt Struct Div I-81043 Capua CE Italy Univ Napoli Federico II Ind Engn Dept Aerosp Div I-80125 Naples Italy

ISBN: (数字)9781510625907

ISBN: (纸本)9781510625891;9781510625907

After pioneering examples in the '70 and the '80, technology advances have brought aircraft morphing systems close to the exploitation on commercial vehicles. However, in spite of many successes, further steps shall be accomplished before series production lines are entered. They introduce new needs and sometimes exasperate aspects till now under control in the design phase. The increased number and kind of parts pushes for implementing additive manufacturing techniques;their modelling gives rise in turn to important simulation challenges. In case of mechanical, alternative to compliant systems, modelling of elements shall take in consideration behavior that is substantially different from the analogous counterparts on classical devices. Hinges and torsion bars are more diffused and smaller in these architectures. This work deals with hinges modelling inside mechanically-driven architectures for adaptive winglets. Impact of these aerodynamic surfaces on aircraft stability is crucial and accurate models are required to guarantee their correct implementation. Morphing capability emphasizes this occurrence even more. Schematization effects are investigated in terms of both static and dynamic response. The variation of the deformed shape is therefore examined, identifying the strain map and internal forces distribution changes, essential for design purposes and stress analysis. Modal characteristics deviations are then explored, which may substantially influence aeroelastic stability margins. It is envisaged that this approach could be exploited to consider lags effect. A parametric investigation is finally carried out to identify structural behavior sensitivity to such kind of modifications.

关键词： Adaptive winglet Morphing aircraft systems Kinematic systems integrated devices FE modelling Hinges schematics Static and dynamic structural response Modal characterization

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A Computational Study of Vibration Delocalization in Cyclic structures Using Adaptive Stiffness Elements 12

A Computational Study of Vibration Delocalization in Cyclic ...

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conference on active and passive smart structures and integrated systems XII

作者： Rodriguez, Andres M. Kauffman, Jeffrey L. Univ Cent Florida 12760 Pegasus DrBldg 40Rm 307 Orlando FL 32816 USA

ISBN: (数字)9781510625907

ISBN: (纸本)9781510625891;9781510625907

This paper investigates potential approaches to delocalize the vibration that result from mistuning in certain cyclic structures. To achieve this delocalization, this paper analyzes a cyclic structure with embedded, adaptive stiffness elements. Cyclic structures are ideally built using identical subsection, mistuning refers to the frequent occurrence that subsections contain some deviations from nominal design parameters. These deviations between otherwise identical subsections can generate localized vibrations. This paper examines using the adaptive structure to achieve different stiffness configurations with the goal of: (1) retuning the structure or (2) decreasing the amplitude of vibration of the localized mode(s). Using a new analysis method developed to identify localized modes of vibration on mistuned cyclic structures, this paper considers a low-order model of a turbine engine blisk with attached adaptive elements. Two method are consider to show the possibility of delocalization. The first method changes the stiffness configuration of the system so that all subsections resonate at the identical frequency. The second method uses a minimization procedure developed to identify the stiffness configurations that minimizes the potential for confined modes of vibration. A mistuned system containing two localized modes was used to test out the delocalization capabilities of each method. Both methods were capable of delocalizing this mistuned system, with method one faring better than method two. Results not only show delocalization, but also that mistuned mode shapes can be distorted back to those of the tuned system.

关键词： Localization Mistuning Adaptive structures Cyclic structures

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