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

共 451 条记录，以下是81-90 订阅

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Structural vibration-based damage classification of delaminated smart composite laminates 12

Structural vibration-based damage classification of delamina...

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conference on active and passive smart structures and integrated systems XII

作者： Khan, Asif Kim, Heung Soo Sohn, Jung Woo Dongguk Univ Seoul Dept Mech Robot & Energy Engn 30 Pildong Ro1 Gil Seoul 04620 South Korea Kumoh Natl Inst Technol Dept Mech Design Engn 61 Daehak Ro Yangho Dong Gumi 39177 Gyeongbuk South Korea

ISBN: (数字)9781510616875

ISBN: (纸本)9781510616875

Separation along the interfaces of layers (delamination) is a principal mode of failure in laminated composites and its detection is of prime importance for structural integrity of composite materials. In this work, structural vibration response is employed to detect and classify delaminations in piezo-bonded laminated composites. Improved layerwise theory and finite element method are adopted to develop the electromechanically coupled governing equation of a smart composite laminate with and without delaminations. Transient responses of the healthy and damaged structures are obtained through a surface bonded piezoelectric sensor by solving the governing equation in the time domain. Wavelet packet transform (WPT) and linear discriminant analysis (LDA) are employed to extract discriminative features from the structural vibration response of the healthy and delaminated structures. Dendrogram-based support vector machine (D-SVM) is used to classify the discriminative features. The confusion matrix of the classification algorithm provided physically consistent results.

关键词： Delamination structural vibration piezobonded laminated composite wavelet packet transform classification

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passive metamaterial-based acoustic holograms in ultrasound energy transfer systems 12

Passive metamaterial-based acoustic holograms in ultrasound ...

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conference on active and passive smart structures and integrated systems XII

作者： Bakhtiari-Nejad, Marjan Elnahhas, Ahmed Hajj, Muhammad R. Shahab, Shima Virginia Polytech Inst & State Univ Dept Biomed Engn & Mech Blacksburg VA 24061 USA Virginia Polytech Inst & State Univ Dept Mech Engn Blacksburg VA 24061 USA

ISBN: (数字)9781510616875

ISBN: (纸本)9781510616875

Contactless energy transfer (CET) is a technology that is particularly relevant in applications where wired electrical contact is dangerous or impractical. Furthermore, it would enhance the development, use, and reliability of low-power sensors in applications where changing batteries is not practical or may not be a viable option. One CET method that has recently attracted interest is the ultrasonic acoustic energy transfer, which is based on the reception of acoustic waves at ultrasonic frequencies by a piezoelectric receiver. Patterning and focusing the transmitted acoustic energy in space is one of the challenges for enhancing the power transmission and locally charging sensors or devices. We use a mathematically designed passive metamaterial-based acoustic hologram to selectively power an array of piezoelectric receivers using an unfocused transmitter. The acoustic hologram is employed to create a multifocal pressure pattern in the target plane where the receivers are located inside focal regions. We conduct multiphysics simulations in which a single transmitter is used to power multiple receivers with an arbitrary two-dimensional spatial pattern via wave controlling and manipulation, using the hologram. We show that the multi-focal pressure pattern created by the passive acoustic hologram will enhance the power transmission for most receivers.

关键词： Acoustic hologram metamaterial contactless power transfer ultrasonic acoustic energy transfer

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A modified control plan to improve performance of tuned vibration absorber 12

A modified control plan to improve performance of tuned vibr...

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conference on active and passive smart structures and integrated systems XII

作者： Han, Ning Gao, Qiang Duan, Chengdong Changan Univ Sch Automobile Xian 710064 Shaanxi Peoples R China Changan Univ Sch Elect & Control Engn Xian 710064 Shaanxi Peoples R China

ISBN: (数字)9781510616875

ISBN: (纸本)9781510616875

The tuned vibration absorber (TVA) has been an effective device for vibration control in many engineering applications. However, using the TVA can cause resonance and actually increase the vibration of the primary system. In recent years, many configurations of the adaptive tuned vibration absorber (ATVA) have been developed to improve the performance of the TVA. In all these studies, a great deal configurations focused on how to widen the bandwidth of the ATVA, but very little effort has been put into the work on reducing the resonance of the primary system. In this paper, a modified control plan based on variable mass ATVA is proposed to reduce the primary system resonance. A number of simulations were carried out to verify the performance of the control plan, and the results show that it's effective on resonance reduction of the primary system.

关键词： vibration control adaptive vibration control smart structure adaptive tuned vibration absorber

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Nonlinear modeling and preliminary stabilization results for a class of piezoelectric smart composite beams 12

Nonlinear modeling and preliminary stabilization results for...

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conference on active and passive smart structures and integrated systems XII

作者： Ozer, Ahmet Ozkan Western Kentucky Univ Dept Math Bowling Green KY 42101 USA

ISBN: (数字)9781510616875

ISBN: (纸本)9781510616875

Existing smart composite piezoelectric beam models in the literature mostly ignore the electro-magnetic interactions and adopt the linear elasticity theory. However, these interactions substantially change the controllability and stabilizability at the high frequencies, and linear models fail to represent and predict the governing dynamics since mechanical nonlinearities are pronounced in certain applications such as energy harvesting. In this paper, first, a consistent variational approach is used by considering nonlinear elasticity theory to derive equations of motion for a single-layer piezoelectric beam with and without the electromagnetic interactions (fully dynamic and electrostatic). This modeling strategy is extended for the three-layer piezoelectric smart composites by adopting the two widely-accepted sandwich beam theories. For both single-layer and three-layer models, the resulting infinite dimensional equations of motion can be formulated in the state-space form. It is observed that the fully dynamic nonlinear models are unbounded boundary control systems (same in linear theory) (y) over dot(t) = (A + N)y(t) + Bu(t), the electrostatic nonlinear models are unbounded bilinear control systems (y) over dot(t) = (A + N)y(t) + (B-1 + B(2)y)u(t) in sharp contrast to the linear theory. Finally, we propose B*-type feedback controllers to stabilize the single piezoelectric beam models. The filtered semi-discrete Finite Difference approximations is adopted to illustrate the findings.

关键词： Piezoelectric smart composite beam nonlinear piezoelectric beam bilinear control filtered semi-discrete Finite Difference Method Mead-Marcus beam Rao-Nakra beam piezoelectric harvester

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Design of new prosthetic leg damper for above knee amputees using a magnetorheological damper activated permanent magnet only 12

Design of new prosthetic leg damper for above knee amputees ...

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conference on active and passive smart structures and integrated systems XII

作者： Cha, Ae-Ri Yoon, Ji-Young Lee, Tae-Hoon Choi, Seung-Bok Inha Univ Dept Mech Engn Smart Struct & Syst Lab Incheon 402751 South Korea

ISBN: (数字)9781510616875

ISBN: (纸本)9781510616875

Magnetorhological fluids (MR) have been applied to numerous devices or systems which require forward or feedback control to achieve desired performances. One of applications is the rehabilitation device. MR dampers applied to artificial joints are implemented with two phases;stance phase: motion to support the feet on the ground, and swing phase : motion to step out. In case of stance phase, the damping force should be increased by applying the magnetic field to support the body. On the other hand, in case of swing phase, the damping force should be removed by not applying the magnetic field so that the prosthesis can be easily rotated by the motor. In this study, a special mechanism of MR damper is proposed to make a prosthetic leg which can derive on/off mode using permanent magnet only. The design mechanism is undertaken and damping force is analyzed to validate the effectiveness of the proposed damper system for the patient's motion without control device.

关键词： Magneto-rheological(MR) Fluid Prosthetic leg MR damper Permanent magnet Flow mode FEM(Finite Elements Method) Magnetic circuit

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Impact Analysis of Fiber-Reinforced Composites by means of Carbon Nanotubes 12

Impact Analysis of Fiber-Reinforced Composites by means of C...

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conference on active and passive smart structures and integrated systems XII

作者： Sbarufatti, Claudio Simon, Pedro Cinquemani, Simone Scaccabarozzi, Diego Politecn Milan Dept Mech Engn Via La Masa 1 I-20156 Milan Italy

ISBN: (数字)9781510616875

ISBN: (纸本)9781510616875

Carbon nanotubes (CNT) can be profitably embedded into the matrix of composite structure to obtain a distributed sensor able to estimate deformations due to vibrations, impacts or high load applied. In this paper electrical measurements of carbon nanotube multiscale GFRPs have been carried out to monitor low velocity impacts and to estimate the severity of corresponding damages. The work has been developed experimentally, by monitoring the variation of the structure electrical impedance as a consequence of impacts. Electrical measurements show that there is an initial decrease of electrical resistance due to plate compression, followed by an increase due to tunneling effect of carbon nanotubes. Criteria based on the dynamic variation of electrical impedance were proposed and their correlation with the impact energy was studied. Severity of damages has been estimated with different approaches, by measuring the damage extends through the microscope. The analysis shows that CNT can properly describe the dynamics of impact. Synthetic indexes proposed in this work to estimate the severity of damages from CNTs electrical measurements have some limitations and, at now, only partially fit with experimental data.

关键词： GFRP carbon nanotubes SHM electrical conductivity impact dynamics active analysis

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A two-way architectural actuator using NiTi SE wire and SME spring 12

A two-way architectural actuator using NiTi SE wire and SME ...

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conference on active and passive smart structures and integrated systems XII

作者： Nematollahi, Mohammadreza Mehrabi, Reza Callejas, Miguel A. Elahinia, Hedyeh Elahinia, Mohammad Univ Toledo Dynam & Smart Syst Lab 2801 W Bancroft St Toledo OH 43606 USA Lirio 9 Architecture Seville Spain

ISBN: (数字)9781510616875

ISBN: (纸本)9781510616875

This paper presents a bio-inspired continuously adapting architectural element, to enable a smart canopy that provides shade to buildings that need protection from sunlight. The smart actuator consists of two elements: one NiTi shape memory (SME) spring and one NiTi superelastic (SE) wire. The SE wire is deformed to a 'U' shape and then the SME spring is attached to it. Due to the force of SE wire exerted on SME spring, the smart canopy is in its open position. When the environment's temperature increases, the actuator activates and shrinks the SME spring and hence it closes the canopy. In continues, when the temperature decreases at evening, the actuator inactive and SE wire will open the smart fabric. This unique activation provides different advantages like silent actuation, maintenance free, eco-friendly, and no or low energy consumption. Here, the conceptual design of the smart canopy actuator will be discussed. Then, a simulation study, using finite element method, is used to investigate components' behavior. The extracted material parameters are implemented in the subroutine, to simulate the behavior of the shape memory alloy elements. Simulation's results predict superelastic behavior for the SE wire and shape memory effect for the NiTi spring. For further studies, a prototype will be fabricated to confirm simulation's results, as well as performing some experimental tests.

关键词： NiTi Architectural element Actuator Superelasticity Shape memory alloy smart actuator smart architecture Sunlight protection Thermal comfort

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active tuned mass damper to generate power from the propagating ocean waves 12

Active tuned mass damper to generate power from the propagat...

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conference on active and passive smart structures and integrated systems XII

作者： Nishimura, Isao Tokyo City Univ Fac Engn Dept Architecture Setagaya Ku 1-28-1Tamazutsumi Tokyo 1588557 Japan

ISBN: (数字)9781510616875

ISBN: (纸本)9781510616875

This paper describes a method that could generate electric energy from the propagating ocean waves by implementing an actively controlled tuned mass damper on a ship sailing on the ocean. There are three fundamental requirements for any alternative energy method to make it work in practice. The first issue is that there should be affluent energy sources in the nature. Then, we should collect and confine them in a compact space by means of a smart method. Finally, we must convert the renewable energy into electric power as fast as possible. The author discusses the weak points and strong points of the proposed power generating method, while paying attention to these three requirements. The author started an observation project that the vibration data from the vessels sailing on the ocean would be collected under different conditions. The motion data obtained from a ship on the ocean gives the energy density spectrum in the frequency domain, which verifies the first requirement mentioned above. There is the appropriate natural period that determines the performance of the device, or equivalently the power of the generator. The solution for the second requirement is the tuned mass damper method, which indirectly collect the energy from the primal system to the auxiliary system by means of gravity. The last requirement is satisfied by the unique control algorithm known as acceleration feedback method, which enhances the cost performance of the tuned mass damper with the low frequency dynamic property.

关键词： active tuned mass damper Energy harvesting Alternative energy Vibration control Wave power

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PARAMETRIC STUDY OF HELICOPTER BLADE FOR active TWIST CONTROL INCORPORATING MACRO FIBER COMPOSITE ACTUATOR

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ASME conference on smart Materials, Adaptive structures and Intelligent systems (SMASIS2018)

作者： Sicim, Muruvvet Sinem Demirci, Dincer Kaya, Metin Orhan Istanbul Tech Univ Fac Aeronaut & Astronaut Turkish Tech INC Istanbul Turkey Istanbul Tech Univ Fac Aeronaut & Astronaut Kale R&D Istanbul Turkey Istanbul Tech Univ Fac Aeronaut & Astronaut Istanbul Turkey

ISBN: (纸本)9780791851944

Helicopters suffer from a number of problems raised from the high vibratory loads, noise generation, load capacity limitations, forward speed limitation etc. Especially unsteady aerodynamic conditions due to the different aerodynamic environment between advised and retreating side of the rotor cause most of these problems. Researchers study on passive and active methods to eliminate negative effects of aerodynamic loads. Nowadays, active methods such as Higher Harmonic Control (HHC), Individual Blade Control (IBC), active Control of Structural Response (ACSR), active Twist Blade (ATB), and active Trailing-edge Flap (ATF) gain importance to vibration and noise reduction. In this paper, strain-induced blade twist control is studied integrated by Macro Fiber Composite (MFC) actuator. 3D model is presented to analyze the twisting of a morph and bimorph helicopter rotor blade comprising MFC actuator which is generally applied vibration suppression, shape control and health monitoring. The helicopter rotor blade is modeling with NACA23012 airfoil type and consists of D-spar made of unidirectional fiberglass, 45 Glass Fiber Reinforced Polymer (GFRP) and foam core. Two-way fluid-structure interaction (FSI) method is used to simulate loop between fluid flow and physical structure to enable the behavior of the complex system. To develop piezoelectric effects, thermal strain analogy based on the similarities between thermal and piezo strains. The optimization results are obtained to show the influence of different design parameters such as web length, spar circular fitting, MFC chord length on active twist control. Also, skin thickness, spar thickness, web thickness are used to optimization parameters to illustrate effects on torsion angle by applying response surface methodology. Selection of correct design parameters can then be determined based on this system results.

关键词： Composite materials Fibers Actuators Blades

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Parametric Studies of the passive Hydroelastic Responses and Stability Boundaries of Flexible Hydrodynamic Lifting Bodies 12

Parametric Studies of the Passive Hydroelastic Responses and...

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conference on active and passive smart structures and integrated systems XII

作者： Chae, Eun Jung Young, Yin Lu Calif State Univ Long Beach Dept Mech & Aerosp Engn 1250 Bellflower Blvd Long Beach CA 90840 USA Univ Michigan Dept Naval Architecture & Marine Engn 2600 Draper Dr Ann Arbor MI 48109 USA

ISBN: (数字)9781510616875

ISBN: (纸本)9781510616875

There is increasing interest in the use of lighter and more flexible hydrodynamic lifting bodies, and the use of active and passive smart structures to simultaneously increase efficiency and maneuverability or to harvest flow kinetic energy. Hydrodynamic lifting bodies can behave very differently compared to aerodynamic lifting bodies because of the much higher fluid density. To focus on the physics, we will use a cantilevered rectangular hydrofoil as a canonical proxy to more complex lift generating devices such as propellers, turbines, wings, and control surfaces, etc. Specifically, we will investigate the maximum deformation and stability limit for hydrofoils made of different materials to quantify the feasible operation space. To efficiently explore the large parametric space, inviscid analytical equations are used to determine the governing non-dimensional material, geometric, and flow parameters, which are systematically varied to examine the passive hydroelastic responses and stability boundaries of canonical hydrofoils with spanwise flexibility. The results demonstrate the in fluence of the relative magnitude between the solid and fluid inertial, damping, and stiffness terms, and resulting impact on the hydroelastic response, governing instability mechanism, and instability boundaries. The results also demonstrate that lifting bodies in water have much lower natural frequencies and higher damping coefficients than in air because of higher fluid inertial and damping forces, both of which are proportional to the fluid density. While all components of the fluid forces are proportional to the fluid density, the fluid damping forces grow with the velocity, while the fluid disturbing forces grow with velocity square. Therefore, the static divergence tends to be the governing instability mode for lifting bodies in water, while the flutter is typically the governing instability mode for lifting bodies in air. The results indicate that the maximum tip deformations in

关键词： Parametric Study Hydroelastic Hydrodynamic Hydrofoil Stability Damping Divergence Natural Frequency

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