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active vibration suppression of helicopter horizontal stabilizers

Active vibration suppression of helicopter horizontal stabil...

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conference on active and passive smart structures and integrated systems

作者： Cinquemani, Simone Cazzulani, Gabriele Resta, Ferruccio Politecn Milan Dept Mech Engn Via La Masa 1 I-20156 Milan Italy

ISBN: (数字)9781510608146

ISBN: (纸本)9781510608139;9781510608146

Helicopters are among the most complex machines ever made. While ensuring high performance from the aeronautical point of view, they are not very comfortable due to vibration mainly created by the main rotor and by the interaction with the surrounding air. One of the most solicited structural elements of the vehicle are the horizontal stabilizers. These elements are particularly stressed because of their composite structure which, while guaranteeing lightness and strength, is characterized by a low damping. This work makes a preliminary analysis on the dynamics of the structure and proposes different solutions to actively suppress vibrations. Among them, the best in terms of the relationship between performance and weight / complexity of the system is that based on inertial actuators mounted on the inside of the horizontal stabilizers. The work addresses the issue of the design of the device and its use in the stabilizer from both the numerical and the experimental points of view.

关键词： Helicopter Vibration control Actuator design

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Enhanced Synchronized Switch Damping control to cancel out the beating phenomenon

Enhanced Synchronized Switch Damping control to cancel out t...

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conference on active and passive smart structures and integrated systems

作者： Cazzulani, Gabriele Costantini, Marco Braghin, Francesco Politecn Milan Dept Mech Engn Via La Masa 1 I-20156 Milan Italy

ISBN: (数字)9781510608146

ISBN: (纸本)9781510608139;9781510608146

Synchronized Switch Damping control is one of the most interesting solutions for vibration suppression proposed in the last years. It is based on the electromechanical coupling provided by piezoelectric actuators. By connecting the piezoelectric actuator to a shunting circuit (typically a RL one) and properly switching between open and closed circuit, an equivalent hysteresis cycle is created and the structure energy is dissipated. It is known that, in order to maximize the damping effect the resistance of the circuit must be reduced. Anyway, as shown in literature, this effect is limited by the presence of a beating effect when the resistance is lower than a certain threshold. The aim of this paper is to analyse the beating phenomenon in order to propose new solutions to cancel it. The paper will show some innovative solutions modifying the shunting circuit to avoid the beating phenomenon and thus increase the control performance. These solutions will be described from a theoretical point of view and then tested to demonstrate their effect.

关键词： Semi-active control Piezoelectric actuator Vibration suppression

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Moving toward low frequencies active vibration control with inertial actuators

Moving toward low frequencies active vibration control with ...

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conference on active and passive smart structures and integrated systems

作者： Cinquemani, S. Costa, A. Resta, F. Politecn Milan Dipartimento Meccan Via La Masa 1 I-20156 Milan Italy

ISBN: (数字)9781510608146

ISBN: (纸本)9781510608139;9781510608146

In applications of vibration suppression, control forces ideally act on the structure increasing its damping. While the frequency response of the structure is guaranteed to have a positive real part under ideal conditions, in practice a stability limit exists when inertial actuators are used. In this case the system response is no longer guaranteed to be positive real and so the control system may become unstable at high gains. Moreover, traditional approaches suggest the use of inertial actuators only if its natural frequency is well below the natural frequency of the structure, thus preventing their use at low frequencies. This paper proposes an interesting technique to enlarge the operational range to lower frequencies and to allow the use of inertial actuators. The approach is numerically tested and experimentally validated on a test rig.

关键词： Inertial actuator Vibration Control

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Vibration control using a variable coil-based friction damper

Vibration control using a variable coil-based friction dampe...

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conference on active and passive smart structures and integrated systems

作者： Amjadian, Mohsen Agrawal, Anil. K. CUNY City Coll Dept Civil & Environm Engn 160 Convent Ave New York NY 10031 USA

ISBN: (数字)9781510608146

ISBN: (纸本)9781510608139;9781510608146

This paper is focused on the analytical model, design, and simulation of a variable coil-based friction damper (VCBFD) for vibration control of structures. The proposed VCBFD is composed of a soft ferromagnetic plate, made of a linear magnetic material, and two identical thick rectangular air-core coils connected in parallel, each one attached to the plate through a friction pad. The friction force is provided by a normal force produced through an attractive electromagnetic interaction between the air-core coils (ACs) and the soft ferromagnetic plate when sliding relative to each other. The magnitude of the normal force in the damper is varied by a semi-active controller that controls the command current passing through the ACs. To demonstrate the efficiency of the proposed VCBFD and its semi-active controller, it has been implemented on a two-degree-of-freedom (2DOF) base-isolated model subjected to the acceleration components of three records of strong earthquakes. The results show that the performance of the proposed VCBFD in its passive-on mode is overshadowed by the undesirable effects of stick-slip motion. However, the damper in its semi-active mode is more successful in not only reducing the displacement of the base-floor but also avoiding stick-slip motion, due to acting completely in its sliding phase.

关键词： Energy dissipation Semi-active damper friction electromagnetic force air-core coil ferromagnetic plate

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A multiple degree of freedom model of piezoelectret foam in an updated multilayer stack configuration

A multiple degree of freedom model of piezoelectret foam in ...

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conference on active and passive smart structures and integrated systems

作者： Tefft, Edward C. Anton, Steven R. Tennessee Technol Univ Dept Mech Engn Dynam & Smart Syst Lab 115 W 10th St Cookeville TN 38505 USA

ISBN: (数字)9781510608146

ISBN: (纸本)9781510608139;9781510608146

Piezoelectric polymers, such as the Emfit polypropylene piezoelectret foam investigated in this study, have distinct advantages over traditional piezoceramics. Although piezopolymers have a smaller piezoelectric coupling coefficient when compared to piezoceramics, they are well suited for in vivo applications, having a lead-free composition, for applications with curved or flexible surfaces, being flexible, or where weight or large shocks are factors, being light weight and resilient. Presented here is an improved electromechanical multiple degree of freedom (MDOF) model of a multilayer piezoelectret foam stack that implements a complex stiffness damping model as a function of measureable material properties, as well as an updated stack configuration which makes use of lighter and more flexible materials than the author's previous configuration. The model predicts the energy harvesting performance of the stack at varying excitation frequencies and for varying stack properties. Finally, the stack model parameters are validated with experimentally determined foam material properties.

关键词： Piezoelectret multilayer stack energy harvesting electromechanical modeling

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Characterization of coiled SMA actuators for humanoid robot

Characterization of coiled SMA actuators for humanoid robot

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conference on active and passive smart structures and integrated systems

作者： Potnuru, Akshay Tadesse, Yonas Univ Texas Dallas Eric Jonsson Sch Engn & Comp Sci Dept Mech Engn Humanoid Biorobot & Smart Syst HBS Lab 800 W Campbell Rd Richardson TX 75080 USA

ISBN: (数字)9781510608146

ISBN: (纸本)9781510608139;9781510608146

In this paper, we present modeling and characterization of coiled SMA spring actuators that are fabricated by coiling cylindrical SMA wires on to a threaded screw mandrel and applying heat treatment. Here, we evaluate a theoretical model that describes the actuation behavior of SMA coiled springs based on the constitutive model of SMA. We have experimentally verified the developed theoretical model and analyzed various parameters with respect to temperature change during actuation. The model was coded in Simulink (R) and the effects of various parameters with respect to temperature change were investigated. Simulations were compared with experiments and good agreement was obtained. We also show, how the high tension winding of SMA on the mandrel help in better performance and understanding of the fabricated coiled SMAs.

关键词： SMA artificial muscles modeling characterization robot humanoid

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Modeling of plucking piezoelectric energy harvesters with contact theory

Modeling of plucking piezoelectric energy harvesters with co...

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conference on active and passive smart structures and integrated systems

作者： Fu, Xinlei Liao, Wei-Hsin Chinese Univ Hong Kong Smart Mat & Struct Lab Dept Mech & Automat Engn Shatin Hong Kong Peoples R China

ISBN: (数字)9781510608146

ISBN: (纸本)9781510608139;9781510608146

Non-harmonic excitations are widely available in the environment of our daily life. We could make use of these excitations to pluck piezoelectric energy harvesters. Plucking piezoelectric energy harvesting could overcome the frequency gap and achieve frequency-up effect. However, there has not been a thorough analysis on plucking piezoelectric energy harvesting, especially with good understanding on the plucking mechanism. This paper is aimed to develop a model to investigate the plucking mechanism and predict the responses of plucking piezoelectric energy harvesters under different kinds of excitations. In the electromechanical model, Hertzian contact theory is applied to account for the interaction between the plectrum and piezoelectric beam. The plucking mechanism is clarified as a cantilever beam impacted by an infinitely heavy mass, in which the multi-impact process prematurely terminates at separation time. We numerically predict the plucking force, which depends on piezoelectric beam, Hertzian contact stiffness, overlap area and plucking velocity. The energy distribution is investigated with connected resistor.

关键词： piezoelectric energy harvesting plucking Hertzian contact theory

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A single of MR Sponge Tactile Sensor Design for Medical Applications

A single of MR Sponge Tactile Sensor Design for Medical Appl...

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conference on active and passive smart structures and integrated systems

作者： Cha, Seung-Woo Kang, Seok-Rae Hwang, Yong-Hoon Choi, Seung-Bok Inha Univ Dept Mech Engn Smart Struct & Syst Lab Incheon 402751 South Korea

ISBN: (数字)9781510608146

ISBN: (纸本)9781510608139;9781510608146

Recently, it is very popular in medical field to adopt robot surgery such as robot-assisted minimally invasive surgery (RMIS). However, there are some problems in the robot surgery. It is very hard to get the touch feeling of the organs during the surgical operation because the surgeons cannot touch and feel repulsive force from the organs directly. So, this work proposes a squeeze mode of single magneto-rheological (MR) sponge to realize viscoelastic property of human organs or skins and undertake a theoretical analysis of MR sponge. In addition, its effectiveness is verified through experimental tests. The similarity between MR sponge and real organs is identified and desired repulsive force of each organs can be achieved by proper selection of MR sponge cell associated with controlled input current.

关键词： Magneto-rheological (MR) fluids Open celled polyurethane foam MR Sponge Cell Tactile Device Repulsive force Robot surgery

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Parametric study of fluid flow manipulation with piezoelectric macrofiber composite flaps

Parametric study of fluid flow manipulation with piezoelectr...

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conference on active and passive smart structures and integrated systems

作者： Sadeghi, O. Tarazaga, P. Stremler, M. Shahab, S. 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)9781510608146

ISBN: (纸本)9781510608139;9781510608146

active Fluid Flow Control (AFFC) has received great research attention due to its significant potential in engineering applications. It is known that drag reduction, turbulence management, flow separation delay and noise suppression through active control can result in significantly increased efficiency of future commercial transport vehicles and gas turbine engines. In microfluidics systems, AFFC has mainly been used to manipulate fluid passing through the microfluidic device. We put forward a conceptual approach for fluid flow manipulation by coupling multiple vibrating structures through flow interactions in an otherwise quiescent fluid. Previous investigations of piezoelectric flaps interacting with a fluid have focused on a single flap. In this work, arrays of closely-spaced, free-standing piezoelectric flaps are attached perpendicular to the bottom surface of a tank. The coupling of vibrating flaps due to their interacting with the surrounding fluid is investigated in air (for calibration) and under water. Actuated flaps are driven with a harmonic input voltage, which results in bending vibration of the flaps that can work with or against the flow-induced bending. The size and spatial distribution of the attached flaps, and the phase and frequency of the input actuation voltage are the key parameters to be investigated in this work. Our analysis will characterize the electrohydroelastic dynamics of active, interacting flaps and the fluid motion induced by the system.

关键词： Piezoelectrics active fluid flow control Macro-fiber composite actuation

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Toward structurally-integrated locally resonant metamaterials for vibration attenuation

Toward structurally-integrated locally resonant metamaterial...

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conference on active and passive smart structures and integrated systems

作者： Schmied, Jascha U. Sugino, Christopher Bergamini, Andrea Ermanni, Paolo Ruzzene, Massimo Erturk, Alper Swiss Fed Inst Technol Leonhardstr 21 Zurich Switzerland Georgia Inst Technol 771 Ferst Dr Atlanta GA 30332 USA Empa Uberlandstr 129 Dubendorf Switzerland

ISBN: (数字)9781510608146

ISBN: (纸本)9781510608139;9781510608146

In this contribution, we explore the use of locally resonant metamaterials for multi-functional structural load-bearing concepts using analytical, numerical, and experimental techniques. Locally resonant metamaterials exhibit bandgaps at wavelengths much larger than the lattice dimension. This is a promising feature for low-frequency vibration attenuation. The presented work aims to investigate highly integrated structural concepts and experimentally validated prototypes for vibration reduction in load-bearing applications. The goal is to explore and extend the design space of lightweight structural systems, by designing multi-functional periodic structural elements, preserving structural stiffness while concurrently enabling sufficiently wideband damping performance over a target frequency range of interest. Following a generalized theoretical modeling framework for bandgap design and analysis infinite structures, the focus is placed on the design, fabrication, and analysis of a load-carrying frame development with internally resonant components. Finite-element modeling is employed to design and analyze the frequency response of the frame and simplified analytical solution is compared with this numerical solution. Experimental validations are presented for a 3D-printed prototype. The effects of various parameters are reported both based on numerical and experimental findings.

关键词： Metamaterial Resonant Vibration Attenuation Numerical Experimental Analytical Bandgap

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