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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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Breaking the limitations of local impedance noise control: passivity and scattering performances of the Advection Boundary Law 18

Breaking the limitations of local impedance noise control: p...

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conference on active and passive smart structures and integrated systems XVIII

作者： De Bono, Emanuele Collet, Manuel Ouisse, Morvan Univ Franche Comte SUPMICROTECH CNRS Inst FEMTO ST F-25000 Besancon France Ecole Cent Lyon CNRS ENTPE LTDSUMR5513 F-69130 Ecully France

ISBN: (数字)9781510671997

ISBN: (纸本)9781510671997;9781510671980

In the aim of attenuating noise transmission through air-ducts, research is prompted for overcoming the limitations of classical acoustic liners, especially in the aero-engines applications. The new generation of UltraHigh-By-Pass-Ratio (UHBR) turbofans while considerably reducing fuel consumption, increases noise pollution especially at lower frequencies because of their larger diameter, lower number of blades and rotational speed. Moreover, they present a shorter nacelle, leaving less available space for acoustic treatments. In case of simplified one-dimensional propagation, integral constraints exist which analytically define the limits of the scattering performances of reciprocal systems, such they are the local impedance liners, for a fixed length of the acoustic treatment along the duct. In this contribution, we analyse a special boundary condition breaking the reciprocity principle, and overcoming the limitations of locally reacting liners. We call it Advection Boundary Law as it introduces a convection on the boundary, responsible of non-reciprocal behaviour at grazing incidence, and of the enhancement of transmission loss with respect to pure locally-reacting resonators. Performances and passivity of such boundary law are numerically analysed first in grazing-incidence problems. The grazing-incidence problem is experimentally studied in a plane-wave acoustic waveguide lined by electroacoustic resonators which can be programmed to reproduce such advection boundary law.

关键词： electro-active acoustic liner programmable metasurface spinning modes impedance control

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Data-driven machine learning for optimal hourglass lattice metamaterial designs 18

Data-driven machine learning for optimal hourglass lattice m...

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conference on active and passive smart structures and integrated systems XVIII

作者： Akash, S. Gupta, Vivek Gupta, Tanuj Bhattayacharya, Bishakh Indian Inst Technol Kanpur Dept Mech Engn Smart Mat Struct & Syst Lab Kanpur India

ISBN: (数字)9781510671997

ISBN: (纸本)9781510671997;9781510671980

This study uses the data-driven machine-learning technique called ridge regression to address an innovative method of designing hourglass lattice-structured metamaterials. Metamaterials are engineered materials with properties derived from their intricate structural arrangements, holding promise for various applications. The hourglass lattice arrangement is exciting because of its unique mechanical characteristics and possible advantages in stiffness modulation. Designing such complex structures often involves manual iterations and simulations, which can be time-consuming and limited in exploring the vast design space. In this paper, we suggest an innovative approach that uses data-driven machine learning to speed up and improve the design process. By training models on a dataset of metamaterial behaviors, we enable the prediction of optimal hourglass lattice configurations for desired mechanical properties. This prediction uses a machine learning a lgorithm to analyze the data obtained from existing design simulations. This predictive capacity empowers researchers and engineers to explore an extensive design space efficiently, thus uncovering optimal configurations that might remain undiscovered using traditional methods like manual adjustments and iteration or physical prototyping and testing, which are time-consuming and labor-intensive. Engineers iteratively refine designs based on simulation or test results, limiting design space exploration and potentially missing optimal configurations. The core innovation lies in the ability of these models to predict the mechanical properties and behaviors of hourglass lattice metamaterials based on their structural characteristics, such as radius of curvature and thickness. This methodology can potentially revolutionize metamaterial design by efficiently using data-driven machine-learning models.

关键词： Metamaterial hourglass structure machine learning variable stiffness polynomial regression ridge regularization

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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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Development of 3D Scan integrated Robot Arm Control for Pulse-Echo Laser Ultrasonic Testing 18

Development of 3D Scan Integrated Robot Arm Control for Puls...

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conference on active and passive smart structures and integrated systems XVIII

作者： Ma, King Sum Lee, Kyu-Jin Lee, Jung-Ryul Korea Adv Inst Sci & Technol Dept Aerosp Engn 291 Daehak Ro Daejeon 34141 South Korea

ISBN: (数字)9781510671997

ISBN: (纸本)9781510671997;9781510671980

Pulse-echo (PE) laser ultrasonic testing (LUT) is a reliable non-destructive testing ( NDT) method used to inspect subsurface damages in composite materials. Accurate detection and localization of damages require a perpendicular impingement angle and a constant stand-off distance between the sensing laser and the inspection surface. A 6-degree-offreedom robot arm can carry the specimen along a raster path to maintain these requirements throughout the LUT process. However, the movement requires precise control over the position and orientation of the robot arm's tool center point (TCP), which depends on the shape of the inspection target. In real-world applications, mathematical representations or 3D CAD models of the inspection target are not always available. This study proposes the use of 3D scan-generated models to create raster scan paths for robotic PE LUT. Geometries of the region of interest ( ROI) are utilized to generate the necessary scan grids for controlling the robot arm's movement.

关键词： Laser ultrasonic testing Robotics 3D scanning Non-destructive evaluation Scan path generation

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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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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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active and passive smart structures and integrated systems ix

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

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active and passive smart structures and integrated systems ix 2020

ISBN: (纸本)9781510635296

The proceedings contain 49 papers. The topics discussed include: torsional loading analysis using cross-shaped piezoelectric sensor;design and experimental verification of a planar type two-dimensional piezoelectric actuator;modeling the behavior of magnetorheological elastomers under different loading conditions;impact damage detection in composite plates using acoustic emission signal signature identification;the influence of geometry on origami's deployment dynamics;aircraft morphing systems: elasticity of selected components and modeling issues;kinematic analysis of a deployable truss structure with flat-form storability;self-powered thin-film impedance spectroscopy sensor system to measure corrosion presence in aerogenerators or aircrafts;and texture analysis using a piezoelectric actuator-sensor pair.

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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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The Advection Boundary Law in presence of mean-flow and spinning modes 18

The Advection Boundary Law in presence of mean-flow and spin...

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conference on active and passive smart structures and integrated systems XVIII

作者： De Bono, Emanuele Collet, Manuel Ouisse, Morvan Salze, Edouard Volery, Maxime Lissek, Herve Mardjono, Jacky Univ Lyon Ecole Cent Lyon LTDS UMR 5513 F-69134 Ecully France Univ Franche Comte SUPMICROTECH CNRS Inst FEMTO ST F-25000 Besancon France Ecole Cent Lyon LMFA F-69130 Ecully France Ecole Polytech Fed Lausanne LTS2 Signal Proc Lab Stn 11 CH-1015 Lausanne Switzerland Safran Aircraft Engines F-75015 Paris France

ISBN: (数字)9781510671997

ISBN: (纸本)9781510671997;9781510671980

In the attempt to reduce fuel consumption, a new generation of Ultra-High-By-Pass-Ratio (UHBR) turbofans have been introduced in the aeronautic industry which are structurally noisier especially at lower frequencies, because of their larger diameter, lower number of blades and rotational speed. Moreover, they present a shorter nacelle, leaving less available space for acoustic treatments. For this reason, innovation in the liner technology is highly demanded. In this contribution, we analyse the performances of an electroacoustic liner, made up of microphones (sensors) and small loudspeakers (actuators). Such array of electroacoustic resonators can feature an interesting boundary operator, called Advection Boundary Law. Such boundary law has been analysed in grazing-incident acoustic fields without air-flow and in case of plane waves. Here, we adapt such boundary condition to attenuate spinning modes. Numerical simulations in case of spinning-modes, shows the potentiality and the passivity issues of such innovative boundary law. Finally, a reproduction of a turbofan engine (scale 1:3) accomplishing real-life rotational speeds, allows to assess the performances of the Advection Boundary Law in presence of mean-flow and spinning-modes.

关键词： electro-active acoustic liner programmable metasurface spinning modes impedance control

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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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