Results 61 to 70 of about 19,961 (120)

Active Damping of Structures with Guy Cables

Journal of Guidance, Control, and Dynamics, 1997
Summary: A strategy is presented for active damping of structures with guy cables. The active member consists of a piezoelectric actuator collocated with a force sensor. The control algorithm consists of an integral force feedback; it has guaranteed stability, including at the parametric resonance. The results are confirmed by an experiment.
Preumont, André, Achkire, Younes
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Active vibration damping actuator and active damping apparatus using the same

The Journal of the Acoustical Society of America, 2007
A vibration damping actuator including: a cup-shaped housing; an output member disposed spaced apart from an opening end of the housing; a guide rod disposed on the output member and positioned inserted into a guide hole; a coil member provided to one of the housing and the output member; an armature disposed on an other of the housing and the output ...
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Active piezoelectric damping composites

Sensors and Actuators A: Physical, 2004
Patches of active piezoelectric damping composites (APDC) consisting of piezoelectric rods, which are obliquely embedded across the thickness of viscoelastic damping matrix, are presented as a viable candidate for smart actuation. In this configuration, activation of the piezo-rods simultaneously enhances both the shear and compression damping ...
A. Baz, A. Tempia
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Active Vibration Damping in Beams

1989 American Control Conference, 1989
The traveling wave approach is discussed of the active vibration control of beam. First an active vibration control for the TIMOSHENKO-beam is designed using external control forces. Then vibration control by means of internal forces. i.e. force systems forming equilibrium groups is discussed. Finally an unexpected resonance phenomenon occuring in this
P. Hagedorn, J. Wallaschek, P. Chen
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Electrohydraulic Active Damping System

CIRP Annals, 2005
A major characteristic of machine tools is the relative dynamic flexibility at the tool centre point. Poorly damped resonance frequencies often cause self-excited vibrations, so called chatter vibrations, which derogate the machined surface and may cause tool breakage.
C. Brecher, A. Schulz, M. Week
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Active damping in HDD actuator

2000 Asia-Pacific Magnetic Recording Conference. Digests of APMRC2000 on Mechanical and Manufacturing Aspects of HDD (Cat. No.00EX395), 2001
One of the limitations inherent in high-track-density hard disk drive design is the effect of actuator mechanical resonant modes on the head-positioning servo. The first servo bandwidth limiting mode is the so-called "butterfly mode," which is the major mode in the head mechanical transfer functions and can not be avoided through mechanical design.
null Fu-Ying Huang, T. Semba, W. Imaino, F. Lee   +3 more
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Active vibration damping device

The Journal of the Acoustical Society of America, 2008
An active vibration damping device having a solenoid actuator designed with a movable element positioned inserted into a guide hole of a stator having a yoke member is attached about a coil to form a stator-side magnetic path with the guide hole lying on its center axis, so that current passed through the coil creates actuating force in the axial ...
Hiroyuki Ichikawa, Yoshinori Watanabe
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Active Control for Vibration Damping

1988
Active control laws are developed for an LSS-type structure to damp vibrations. High frequency modelling uncertainties lead to the necessity for a robust control design. The Linear Quadratic Gaussian with Loop Transfer Recovery (LQG/LTR) control design technique is a particular robust design technique selected for use in designing a damping control ...
P. J. Lynch, Siva S. Banda
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Active vibration damping system

The Journal of the Acoustical Society of America, 2009
A system (100, 200, 300) for damping vibrations of a vibratory structure (104, 308). The damping system includes an active damper (112, 124, 128, 216), a vibration sensor (116, 208, 208A′-C′), and a controller (120, 212) for controlling the active damper in a manner that damps vibration of the vibratory structure. In some embodiments, the active damper
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Arrangement for active sound damping

The Journal of the Acoustical Society of America, 1996
It is known in the state of the art to dampen noise emissions by means of "anti-sound". In the gas exhaust installations of combustion machines, this is realized most often in that the exhaust gas flowing in the gas exhaust installation is charged with "anti-sound" produced by loudspeakers (12).
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