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

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active and passive smart structures and integrated systems xvii

Active and Passive Smart Structures and Integrated Systems X...

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active and passive smart structures and integrated systems xvii 2023

ISBN: (纸本)9781510660731

The proceedings contain 58 papers. The topics discussed include: experimental realization of physical reservoir computing-based mechano-intelligence in self-adaptive phononic metastructures;self-powered electronic mechanical metamaterials;elastic wave manipulation implemented using a locally resonant metasurface with digitally tunable piezoelectric shunts;experimental assessment to evaluate adhesion in hybrid composite structures containing shape memory alloy layers;active deployment of ultra-thin composite booms with piezoelectric actuation;ultrasonic piezoelectric transducer design with concave surface;structural modal parameter identification incorporating with semi-active piezoelectric control;piezoelectric ring-stack actuator design for high-frequency valve;discontinuous refractive index in metamaterial study;and design of a lightweight SMA driven parallel gripper for collaborative robots.

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Advances in Autonomous Materials and structures 17

Advances in Autonomous Materials and Structures

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conference on active and passive smart structures and integrated systems xvii

作者： Zhang, Qianyun Alavi, Amir H. New Mexico State Univ Dept Civil Engn Las Cruces NM 88003 USA Univ Pittsburgh Dept Civil & Environm Engn Pittsburgh PA 15260 USA

ISBN: (纸本)9781510660731;9781510660748

The ceaseless quest to realize novel classes of functional materials has provided new road maps to material autonomy. Autonomous materials and structures offer advanced functionalities such as sensing, actuation, self-healing, communication, and computing to create a sense-decide-respond loop. They have numerous applications in robotics, human-machine interfacing, micro/nano-electromechanical systems, and flexible electronics. During the past decades, tremendous effort has been made to push the development of autonomous materials and structures. This paper presents an overview of the recent progresses, challenges and futures trends in autonomous materials and structures. In the area of material autonomy, active multifunctional metamaterials appear to open enormous field of study. Their scalability is an important feature to create building blocks for multiscale autonomous structures. Thus, this review paper provides an insight into their developments and future trends. The foreseeable challenges are further discussed.

关键词： Material autonomy active metamaterials Actuation Information processing Additive manufacturing

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Experimental assessment to evaluate adhesion in hybrid composite structures containing Shape Memory Alloy layers 17

Experimental assessment to evaluate adhesion in hybrid compo...

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conference on active and passive smart structures and integrated systems xvii

作者： Milosavljevic, Dusan Lecis, Nora Cinquemani, Simone Politecn Milan Via Giuseppe La Masa 1 I-20156 Milan Italy

ISBN: (纸本)9781510660731;9781510660748

Embedding SMA layers in a composite structure is a promising technology to improve mechanical features, but this achievement must not come at the cost of structural integrity. The research carried out within this paper was focused on assessing the delamination behavior of hybrid composite structures, specifically, ones composed of layers of a Cu-based shape memory alloy (SMA) and a glass-fiber reinforced polymer (GFRP). Different patterns of holes cut into SMA layers of a composite material have the potential to produce topologies that can be applied for improved damping in lightweight structures. To make an initial assessment of the effects of different hole patterns on the structural integrity of the composite, the authors have designed an experimental setup intended for the application of Mode II (shear) loading to the composite samples up to the point of failure.

关键词： composite delamination shear adhesion pattern SMA shape memory alloys Cu-Al-Mn

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An origami-inspired tensegrity structure with multistability 17

An origami-inspired tensegrity structure with multistability

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conference on active and passive smart structures and integrated systems xvii

作者： Rodriguez-Feliciano, Richard Wanga, K. W. Univ Michigan Dept Mech Engn Ann Arbor MI 48109 USA

ISBN: (纸本)9781510660731;9781510660748

Tensegrity structures have been harnessed in the design of many reconfigurable and deployable systems due to their high strength to weight ratio, stiffness tunability and multistability programmability. In this paper, we present a design methodology of an origami-inspired multistable tensegrity structure that can achieve up to three stable configurations in one unit cell. This class-3 tensegrity structure can achieve equilibrium states at the fully deployed and flat folded states, and the transition between its stable states is controlled with a one directional displacement, a feature not observed in previous tensegrity elements. To design this system the required input are the three heights at which a stable configuration is desired. At each height the total strain energy of the system of strings is evaluated to select the unstretched length and stiffness values of each string that satisfy the conditions of stability. Analytically it was found that achieving a stable configuration at each height is affected by the number of strings that are in tension at this point, and the deformation path, stiffness and unstretched length of each string.

关键词： tensegrity origami tristable multistability deployable structures

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Adaptive structures for noise and vibration guidance, monitoring and control 17

Adaptive structures for noise and vibration guidance, monito...

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conference on active and passive smart structures and integrated systems xvii

作者： Dimino, Ignazio Ciminello, Monica Di Caprio, Francesco Barbarino, Mattia Ameduri, Salvatore Concilio, Antonio Petrosino, Francesco Mingione, Giuseppe Brindisi, Angela Piscitelli, Filomena Pellone, Lorenzo Ctr Italiano Ric Aerospaziali I-81043 Capua Italy

ISBN: (纸本)9781510660731;9781510660748

In this paper an overview is given on some relevant activities performed by CIRA within the field of noise and vibration, guidance, monitoring and control. Conventional microphones, piezoelectric materials and fiber optics are the sensing strategies used for the proposed applications. High level of integrability, wide operational frequency range are just some features that make them particularly suited for noise and vibration, structural monitoring and sensing, micro actuation and harvesting. The first study regards an active headrest system developed for aircraft cabin seats based on the filtered-X LMS algorithm. Experiments carried out on a mock-up of active headrest are described along with noise attenuation results in a representative acoustic field. After that, a structural monitoring application is presented via strain gauges, piezoceramic sensors, and fiber optics. A series of drop tests are executed on a representative model of a flexible fuel tank, that is dropped from a certain height on an instrumented steel plate and equipped with such deformation sensors. Finally, guided elastic waves generated by piezoelectric transducers are investigated for de-icing purposes. The development of such a specific technology has required the assessment of a dedicated approach that is addressed in this paper, along with its level of maturation and possible future developments.

关键词： Noise and Vibration Ice protection

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Metamaterial design technologies toward in-space manufacturing 18

Metamaterial design technologies toward in-space manufacturi...

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conference on active and passive smart structures and integrated systems xviiI

作者： Lu, Wei-Chun Oudghiri-Idrissi, Othman Poli, Andrea Arruda, Ellen Tol, Serife Univ Michigan Dept Mech Engn Ann Arbor MI 48109 USA

ISBN: (数字)9781510671997

ISBN: (纸本)9781510671997;9781510671980

Highly precise space structures are sensitive to vibration during on-orbit operation. This work develops metamaterials that can be integrated into space structures, namely dissipative metamaterial beams for vibration mitigation. The proposed dissipative phononic crystal beam with twisted viscoelastic inclusions presents high structural damping over a large space-level temprature range. The developed novel metamaterials can be implemented in the next-generation space structures, which can be manufactured and assembled in space to enhance their spatiotemporal precision.

关键词： Dissipative metamaterials space structures in-space manufacturing

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active Deployment of Ultra-thin Composite Booms with Piezoelectric Actuation 17

Active Deployment of Ultra-thin Composite Booms with Piezoel...

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conference on active and passive smart structures and integrated systems xvii

作者： Daye, Jacob G. Lee, Andrew J. North Carolina State Univ Dept Mech & Aerosp Engn Raleigh NC 27606 USA

ISBN: (纸本)9781510660731;9781510660748

The efficacy of using piezoelectric actuators to initiate the dynamic deployment of bistable composite tape springs is evaluated in this paper. Ultra-thin composite booms such as tape springs and their cross-sectional variants have seen increased popularity in spacecraft structures due to enabling the precise deployment of flexible solar arrays, sails, reflectors, and antennas. They can elastically transition between the deployed "extended" position and the stowed "coiled" position while retaining superior stiffness, thermal properties, mass efficiency, and compactness when compared to thin-shelled metal booms and rigid articulated columns. Bistability in the coiled and extended states allows the boom to exhibit more controllable self-deployment and become reconfigurable, which could allow spacecraft to relocate, redeploy, and adapt to changing environmental conditions or mission objectives. Deployment systems commonly include motors and mechanical restraints that significantly contribute to mechanical complexity and spacecraft weight. Since bistable booms do not rely on elastic instability of packaging to initiate motion, a non-intrusive and lightweight actuation mechanism is needed to trigger deployment. This paper experimentally demonstrates how a Macro Fiber Composite (MFC) actuator can statically and dynamically excite a stowed composite tape spring to initiate unrolling into its extended state.

关键词： space structures deployment piezoelectric actuator thin-ply composite booms tape spring

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Investigation of a dynamic active/passive noise cancellation of polyborosiloxane thin membrane gel 17

Investigation of a dynamic active/passive noise cancellation...

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conference on active and passive smart structures and integrated systems xvii

作者： Myronidis, Konstantinos Fierro, Gian Piero Malfense Meo, Michelle Pinto, Fulvio Univ Bath Dept Mech Engn Claverton Down Bath BA2 7AY Avon England Univ Southampton Dept Aeronaut & Astronaut Southampton SO17 1BJ Hants England

ISBN: (纸本)9781510660731;9781510660748

This study proposes a multifunctional, thin membrane gel based on a formulation of PDMS and boron. The proposed gel offers a dynamic passive stimuli-responsive sound absorption at low frequencies, which can be transformed to active noise cancellation with the use of a secondary sound source. The passive behaviour of the proposed material is the result of a dynamic phase transition in the material's polymeric network, activated by the interaction with the travelling sound pressure wave. The presence and extent of the phase transition in the material was investigated via Fourier transform infrared spectroscopy and oscillatory rheological measurements, where it was found that the amount of boron in the gel has a crucial role on the occurrence of the phase transition and consequently on its acoustic performance. The passive scenario results revealed a high and dynamic absorption of approximately 80% at the absorption coefficient peaks, which dynamically shifted to lower frequencies while sound amplitudes were increased. The active noise cancellation was successfully demonstrated at the lower frequencies range, as the occurrence of the phase transition was actively controlled via the sound pressure wave introduced. The aforementioned phase transition was intensified, with energy consumed in this process, resulting in a dynamic noise cancellation. These results demonstrated that the proposed gel membrane material can be used to develop active/passive deep subwavelength absorbers with unique properties, which can dynamically tune their performance in response to external stimuli, and that can be further controlled/activated with the use of mechanical transducers.

关键词： Sound absorption Low Frequency Range active/passive System Shear Stiffening Gel

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Comparison of semi-active damping strategies for magnetorheological sandwich beams 17

Comparison of semi-active damping strategies for magnetorheo...

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conference on active and passive smart structures and integrated systems xvii

作者： Vazquez, Christian G. Ortega, Juan J. Kauffman, Jeffrey L. Univ Cent Florida Dept Mech & Aerosp Engn 4000 Cent Florida Blvd Orlando FL 32816 USA

ISBN: (纸本)9781510660731;9781510660748

The purpose of this research is to measure the free-decay dynamics of a magnetorheological (MR) sandwich beam when influenced by a semi-active magnetic field and comparing the resulting damping performance to those of baseline fields. The research effort involved an experiment where the beam freely decayed while in a magnetic field that influences the MR sandwich beam, altering its damping performance. In addition to baseline cases of no magnetic field or a constant field, the electromagnet also had a field that would shut off after a set time and a field that would switch between a high and low field strength at a certain frequency. These results were also recreated numerically, which required an experimental modal analysis to gather certain material property data. The experimental findings showed little variation in the damping performance regardless of the magnetic field used, while the numerical analysis indicate that the magnetic fields would quicken damping, but only slightly. The results suggest that improvements to the sandwich beam structure may yield the greatest improvement in MR-fluid-based damping performance.

关键词： Magnetorheological fluids free decay sandwich beam magnetic field damping modal analysis

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Modeling of wind-induced vibration control and energy harvesting of traffic signal structures 17

Modeling of wind-induced vibration control and energy harves...

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conference on active and passive smart structures and integrated systems xvii

作者： Qian, Feng Ragai, Ihab Nie, Xiaochun Liao, Yabin Penn State Univ Behrend Coll Sch Engn Erie PA 16563 USA Chongqing Univ Sci & Technol Sch Civil Engn & Architecture Chongqing 401331 Peoples R China Embry Riddle Aeronaut Univ Prescott Dept Aerosp Engn Prescott AZ 86301 USA

ISBN: (纸本)9781510660731;9781510660748

Traffic signal support structures are slender, highly flexible, and lightly damped. Therefore, they are particularly susceptible to wind-induced vibrations, which result in repeated load stresses and fatigue failures. A tuned energy harvesting inerter damper (TEHID)is proposed to reduce wind-induced vibrations of traffic signal support structures and convert the wasted vibration energy into electricity. The TEHID creates a large inertia mass by converting the low-frequency vibration motion of the light head to a high-speed rotation thereby eliminating the need for a large physical mass and accommodation space required by the conventional tuned mass damper (TMD). This paper focuses on the nonlinear dynamics modeling of the wind-induced vibration control and energy harvesting system for traffic signal support structures. The traffic signal structure is modeled as an L-shaped beam with multi-segments and the TEHID is simplified as a three-element device consisting of a spring, a damper, and an inerter. The nonlinear equations and the boundary conditions governing the motion of the integrated vibration control and energy harvesting system are derived from the energy method and presented herein. Modal analysis is conducted and the derived natural frequencies and mode shapes are compared with the finite element simulation results to validate the analytical model.

关键词： Traffic signal structures Vibration control Energy harvesting Tuned inerter damper

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