Optimization Analysis of Impact Viscous Damper for Controlling Self-Excited Vibrations

Asfar, K. R.; Akour, Salih N.

doi:10.1177/1077546305048325

Cited by 13 publications

(9 citation statements)

References 21 publications

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“…The hyper-surface Σ α defines the transition from Γ − to Γ + , i.e., when the mass initiates the contact with the support, Σ α = x ∈ R 2 h α (θ,θ) = 0 and h β (θ,θ) 0 . (11) Surface Σ β defines the transition from Γ + to Γ − as the contact is lost when the impact force vanishes:…”

Section: Mathematical Modeling and Comparison Between Numerical Simulmentioning

confidence: 99%

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Mathematical modeling and experimental investigation of an embedded vibro-impact system

Aguiar

Weber

2010

Nonlinear Dyn

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The subject of this work is the experimental investigation and the mathematical modeling of the impact force behavior in a vibro-impact system, where a hammer is mounted on a cart that imposes a prescribed displacement. By changing the hammer stiffness and the impact gap it is possible to investigate the impact force behavior under different excitation frequencies. The experimental data will be used to validate the mathematical model. The hammer behavior is studied in more detail using a nonlinear analysis, which shows the various responses of the hammer, such as dynamical jumps, bifurcations and chaos.

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Section: Mathematical Modeling and Comparison Between Numerical Simulmentioning

confidence: 99%

“…The study of vibro-impact systems has been the aim of several researches, from the application of a percussive action in rotary drilling for improved performance [5][6][7], to ultrasonic drilling [8][9][10], impact dampers [11,12] and vibro-safe percussion machines [13].…”

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confidence: 99%

Mathematical modeling and experimental investigation of an embedded vibro-impact system

Aguiar

Weber

2010

Nonlinear Dyn

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“…The trial result revealed that the proposed three-dimensional isolation fl oor can successfully shield the computer system in a nuclear power plant from external vibration. Asfar and Akour (2005) utilized a viscous damper to suppress self-excited vibrations. Viscous dampers have also been applied to 3D irregularly framed structures with the peripheral drift constrained.…”

Section: Introductionmentioning

confidence: 99%

Mitigation of micro vibration by viscous dampers

Lin

Chen²,

Chang³

et al. 2009

Earthq. Eng. Eng. Vib.

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This study proposes a micro vibration mitigation system using viscous dampers to solve the problem of vibration in a high-tech building. Due to the operating frequency of the air conditioners and fundamental mode of the fl oors, a resonant phenomenon is occasionally experienced at the upper levels of the structure. Several strategies were considered, and viscous dampers combined with a suspension system were chosen to mitigate this annoying situation. A theoretical analysis was fi rst executed to determine the optimal design value of the damper and the suspension spring. An effi cient reduction in fl oor velocity of approximately 50 % was achieved by the proposed system. Practical verifi cations including a performance test of the micro-vibration-oriented dampers, the pragmatic application result, and a comparison in one-third octave spectrum was then carried out. The performance of the system was demonstrated by the data measured. It alleviated more trembling than was numerically expected. The energy absorbed by the viscous dampers is illustrated by the hysteresis loops and the one-third octave spectrum. It is found that with the proposed system, the vibration can be effectively captured by the viscous damper and converted to lower frequency-content tremors. The success of this project greatly supports the proposed standard two-stage analysis procedure for mitigating micro-vibration problems in practice. This research extends the use of viscous dampers to a new fi eld.

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Section: Introductionmentioning

confidence: 99%

Impact Force Magnitude Analysis of an Impact Pendulum Suspended in a Vibrating Structure

Aguiar

Weber

2012

Shock and Vibration

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The purpose of this work is the experimental investigation and the mathematical modeling of the impact force behavior in a vibro-impact system, where an impact pendulum is mounted on a cart that moves with a prescribed displacement. The dynamics of the system will be evaluated considering different excitation frequencies and changing the impact gap. Experimental data are used to validate the mathematical model. The mathematical model allows a detailed nonlinear analysis, showing the rich response of the system, which includes dynamical jumps, bifurcations and chaos. In impact systems, discrepancies between numerical results and experimental measurements are common due to the difficulty in describing all factors that influence the resulting impact force profile. The use of wires to suspend the impacting body has the purpose to limit these uncertainties.

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Optimization Analysis of Impact Viscous Damper for Controlling Self-Excited Vibrations

Cited by 13 publications

References 21 publications

Mathematical modeling and experimental investigation of an embedded vibro-impact system

Mathematical modeling and experimental investigation of an embedded vibro-impact system

Mitigation of micro vibration by viscous dampers

Impact Force Magnitude Analysis of an Impact Pendulum Suspended in a Vibrating Structure

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