Results 271 to 280 of about 226,936 (306)
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Mechanical Systems and Signal Processing, 2013
Abstract Reliable gearbox design calculations require sufficient insight in gearbox dynamics, which is determined by the interaction between the different excitation mechanisms and the gearbox modal behavior. Both external gearbox excitation originating from the wind turbine drive train and internal gearbox excitation are important.
Jan Helsen +6 more
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Abstract Reliable gearbox design calculations require sufficient insight in gearbox dynamics, which is determined by the interaction between the different excitation mechanisms and the gearbox modal behavior. Both external gearbox excitation originating from the wind turbine drive train and internal gearbox excitation are important.
Jan Helsen +6 more
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Design of Viscous Dampers in Seismically Excited Flexible Truss Towers
Journal of Earthquake Engineering, 2013In the present article, the gain matrix for active devices placed directly between masses on a truss tower is transformed for devices placed at multiple levels between masses. The transformed gains are then used with the single-mode approach to determine the damper coefficients.
K. K. Walsh +2 more
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Mechanical model for cylindrical flexible concrete tanks undergoing lateral excitation
Soil Dynamics and Earthquake Engineering, 2018Abstract In this paper, a mechanical model is developed for evaluating the seismic response of flexible concrete cylindrical tanks under horizontal ground motion. For obtaining the parameters of the liquid-shell interaction of this model, a semi-analytical approach is employed using the Rayleigh–Ritz method.
R. Moradi, F. Behnamfar, S. Hashemi
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Control synthesis for flexible space structures excited by persistent disturbances
Journal of Guidance, Control, and Dynamics, 1992Summary: Both classical and state-space synthesis methods for active control of flexible space structures in the presence of persistent disturbances are presented. The methods exploit the so-called internal model principle for asymptotic disturbance rejection.
Wie, Bong, Gonzalez, Marcelo
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Stability and Control of Flexible Spacecraft with Parametric Excitation
IFAC Proceedings Volumes, 1978Abstract The analysis and control of flexible spacecraft has attracted considerable attention in recent years; in particular with ever increasing demands for fine pointing accuracy and larger and more complex vehicles, this problem is becoming more significant.
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Parametric resonance of flexible footbridges under crowd-induced lateral excitation
Journal of Sound and Vibration, 2008Abstract The excessive lateral sway motion caused by crowds walking across footbridges has attracted great public attention in the past few years. Three possible mechanisms responsible for such lateral vibrations have been investigated in the literature: direct resonance, dynamic interaction, and internal resonance.
PICCARDO, GIUSEPPE, TUBINO, FEDERICA
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Stochastic response of flexible rotor-bearing system to seismic excitations
Probabilistic Engineering Mechanics, 1986Abstract Random vibration analysis of flexible rotor-bearing systems subjected to six-component nonstationary earthquake ground accelerations is carried out. The rotor system consists of several rigid disks and a flexible shaft that is modelled as a Timoshenko beam.
Ki Bong Kim, Jann N. Yang, Y.K. Lin
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Microwave re-excitation of femtosecond laser tagging for highly flexible velocimetry
Optics LettersMolecular tagging velocimetry is typically species specific and limited by excited state/species lifetimes. We utilize laser-generated ionization, long-lived anions, and a time-delayed microwave pulse to monitor the tagged region up to several milliseconds.
Fynn Reinbacher +2 more
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Response of a flexible marine column to base excitation
1984The displacement response of a flexible, surface-piercing cylinder subjected to a unidirectional base motion is considered in this study. Laboratory experiments have been performed with a circular, fixed-base model using sinusoidal and scaled seismic input motion.
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