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active and passive structural design concepts for improved empennage effectiveness of aircraft

Proceedings of SPIE - The International Society for Optical Engineering 2000年 3985卷 121-129页

作者： Weiss, Franz Schweiger, Johannes Simpson, John Kullrich, Thomas DaimlerChrysler Aerospace AG Muenchen Germany

A new design approach for vertical tails is presented. The concept is based on a smart system for the attachment of the complete tail surface to the fuselage. If properly designed, the variable stiffness of the system will provide improved aerodynamic effectiveness of the tail at any flight condition compared to the rigid aircraft.

关键词： Empennages

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Damping properties of stay cable-passive damper system with effects of cable sag and damper stiffness

Damping properties of stay cable-passive damper system with ...

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conference on active and passive smart structures and integrated systems

作者： Liu, Min Zhang, Guangqiao Harbin Inst Technol Sch Civil Engn Harbin 150090 Peoples R China

ISBN: (纸本)9780819494719

The present paper derivate the asymptotic solution of modal damping of one taut stay cable attached with one passive damper including damper stiffness and viscous damping. The effect of the damper stiffness on the modal damping of the stay cable-passive system was analytical investigated. On the basis of the asymptotic solution of modal damping of one stay cable attached with one passive damper with the effect of cable stiffness and by using the decay factor of damper stiffness and the decay factor of cable sag, maximum modal damping ratio and corresponding optimal damping coefficient, which indicates the relationships of the characteristics of the damper and the cable sag was theoretically analyzed. Numerical analysis of parameters on the effect of dynamic performance of the controlled stay cable was conducted.

关键词： Damping properties Stay cable passive damper cable sag damper stiffness

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Coupled building control using 'smart' damping strategies

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Proceedings of SPIE - The International Society for Optical Engineering 2000年 3985卷 482-490页

作者： Christenson, R.E. Spencer Jr., B.F. Johnson, E.A. Seto, K. Univ of Notre Dame Notre Dame United States

Coupling adjacent buildings with supplemental damping devices is a developing method of mitigating structural responses due to wind and seismic excitations. The concept is to allow structures, vibrating at different frequencies, to exert control forces upon one another to reduce the overall responses of the system. Previous studies have identified optimal coupled building configurations and have introduced passive, active and 'smart' damping control strategies. This paper will focus on the application of 'smart' dampers as coupling link devices to produce control forces between three tall buildings. smart dampers are semi-active dampers capable of changing their dynamic characteristics in real-time to allow for a variety of control forces to be produced without requiring significant energy. A clipped optimal control strategy is employed for the smart dampers that can provide increased performance, over a comparable passive control strategy, during moderately severe seismic events.

关键词： Intelligent buildings

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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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passive, active and Semi-active Series Tuned Mass Dampers

Passive, Active and Semi-active Series Tuned Mass Dampers

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conference on active and passive smart structures and integrated systems

作者： Tang, Xiudong Zuo, Lei SUNY Stony Brook Dept Mech Engn Stony Brook NY 11794 USA

ISBN: (纸本)9780819480583

This paper is a comprehensive study of series tuned mass damper (TMDs) for vibration mitigation in passive, active, and semi-active manners. Recently, the authors proposed a novel configuration of TMD with multiple auxiliary absorbers connected to the primary structure in series, and proved that passive series TMDs are more effective and robust than other types of TMDs. Here we further extend the study to active and semi-active controls using LQG and clipped algorithms. The advantages of series TMDs are further highlighted in comparison with the classic TMD. Numerical simulations based on the parameters of Taipei 101 tower are carried out. It is founded that in the passive implementation we can reduce the total mass requirement by 40%, and decrease the damping coefficient to 1/30. We also found that in the active and semi-active manners, the requirement of actuation force is reduced to only 1/4 while achieving the same or better performance.

关键词： Tuned mass damper Dynamic vibration absorber Decentralized control LQG Clipped optimal control

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REVIEW OF smart MATERIAL TECHNOLOGIES FOR active PARACHUTE APPLICATIONS

REVIEW OF SMART MATERIAL TECHNOLOGIES FOR ACTIVE PARACHUTE A...

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conference on active and passive smart structures and integrated systems

作者： Favini, Eric Niezrecki, Christopher Chen, Julie Willis, David Niemi, Eugene Desabrais, Kenneth Univ Massachusetts Lowell Dept Mech Engn 1 Univ Ave Lowell MA 01854 USA US Army Natick Res Dev & Engn Ctr Natick MA 01760 USA

ISBN: (纸本)9780819480583

The performance (drag, lift, stability, etc.) of a parachute is a function of the physical properties of the canopy fabric (such as porosity) and geometry of the canopy (such as air-vent openings). These variables typically remain constant during descent and therefore the parachute retains constant drag and lift. The ability to change these variables and the parachute drag and lift characteristics during flight will greatly widen the performance envelope of a parachute, the maneuverability, and versatility of the airdrop mission. This paper provides a literature review of existing smart material technologies in an effort to improve the performance characteristics and enhance the safety of existing parachutes and parafoils by incorporating these advanced materials into parachute systems.

关键词： smart parachute active parachute smart fabric smart textile parachute strain sensor

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Vibration Suppression of Satellites using Multifunctional Platforms

Vibration Suppression of Satellites using Multifunctional Pl...

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conference on active and passive smart structures and integrated systems

作者： Antin, Nicolas Russ, Richard Ma, Kougen Ghasemi-Nejhad, Mehrdad N. Univ Hawaii Manoa Intelligent & Composite Mat Lab Dept Mech Engn Honolulu HI 96822 USA

ISBN: (纸本)9780819475480

This research focuses on a finite element analysis of active vibration suppression capabilities of a smart composite platform, which is a structural interface between a satellite main thruster and its structure and possesses simultaneous precision positioning and vibration suppression capabilities for thrust vector control of a satellite. First, the combined system of the smart composite platform and the satellite structure are briefly described followed by the finite element modeling and simulations. The smart platform piezoelectric patches and stacks material properties modeling, for the finite element analysis, are developed consistent with the manufacturer data. Next, a vibration suppression scheme, based on the modal analysis, is presented and used in vibration suppression analysis of satellite structures of the thrust vector under the thruster-firing excitation. The approach introduced here is an effective technique for the design of smart structures with complex geometry to study their MIMO active vibration suppression capabilities.

关键词： active vibration suppression smart structures design finite element analysis smart composite platform thrust vector control satellite vibration control

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Decentralized Control of Vibration with active smart Dampers 12

Decentralized Control of Vibration with Active Smart Dampers

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conference on active and passive smart structures and integrated systems XII

作者： Cinquemani, S. Resta, F. Politecn Milan Dept Mech Engn Via La Masa 1 I-20156 Milan Italy

ISBN: (数字)9781510616875

ISBN: (纸本)9781510616875

active vibration suppression can be profitably implemented on large structures to enhance their performance (eg. comfort, fatigue life, etc.). Application on large structures, however, often require a complex setup that makes these solutions too complex to be effectively used. That is because of the high number of sensors and actuators, suitably cabled, in addition to all the devices necessary to condition and amplify the signals of measurement and control and to execute in real time the control algorithms synthesized. One of the most effective technique to reach this goal is to increase the equivalent damping of the system and then the dissipation of the kinetic energy (the so called skyhook damping technique). This work is aimed to simplify this setup by using stand-alone smart dampers developed to carry out operations of vibration control in an autonomous way, thus containing an actuator, the sensors needed to evaluate the vibratory state of the structure, and a micro-controller embedding different control algorithm. The paper shows that the use of more devices, each working independently to perform a decentralized control, can be profitably used to better suppress vibration of the structure.

关键词： smart device Vibration control smart structures Damping

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Piezo shunt power flow optimization for composite beam stabilization

Piezo shunt power flow optimization for composite beam stabi...

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conference on active and passive smart structures and integrated systems

作者： Collet, Manuel Cunefare, Kenneth A. Beck, Benjamin CNRS UFC FEMTO ST Dept Appl Mech UMR 6174 24 Chemin Epitaphe Besancon France GW Woodruff Sch Mech Engn Atlanta GA 30313 USA

ISBN: (纸本)9780819471147

Numerical and technological tools have been developed for complete electromechanical integration of innovative shunting damping strategies for piezoelectric composite beam stabilization to realize a new type of hybrid piezocomposite smart structure. The approach enhances the performance of fully passive configurations to control mechanical power flow in a beam by using negative capacitance elements. In contrast to passive shunted components that target discrete modes, negative capacitance shunted piezoelectric transducers offer the potential for broadband control from the low Hertz into the kilohertz range. This paper presents an original approach to tune vibration power flow dispersion in a piezocomposite beam to obtain total wave absorption by only optimizing the electrical circuit configuration shunting a single piezopatch. The numerical study considers the power flow efficiency of the strategy and the stability and robustness difficulties observed when a single device is considered. The simplicity of the proposed electromechanical controlling device affords the possibility to define and realize distributed configurations and also lends itself to integrated distributed smart composite structures.

关键词： integrated smart composite power flow control shunted piezoelectric devices

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An adaptive optimal control for smart structures based on the subspace tracking identification technique

An adaptive optimal control for smart structures based on th...

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conference on active and passive smart structures and integrated systems

作者： Ripamonti, Francesco Resta, Ferruccio Borroni, Massimo Cazzulani, Gabriele Politecn Milan Dept Mech Engn I-20156 Milan Italy

ISBN: (纸本)9780819499837

A new method for the real-time identification of mechanical system modal parameters is used in order to design different adaptive control logics aiming to reduce the vibrations in a carbon fiber plate smart structure. It is instrumented with three piezoelectric actuators, three accelerometers and three strain gauges. The real-time identification is based on a recursive subspace tracking algorithm whose outputs are elaborated by an ARMA model. A statistical approach is finally applied to choose the modal parameter correct values. These are given in input to model-based control logics such as a gain scheduling and an adaptive LQR control.

关键词： Real-time identification ARMA/X models subspace tracking adaptive control

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