Results 261 to 270 of about 44,670 (307)

On the damping ratio of multi‐degree‐of‐freedom systems

Communications in Applied Numerical Methods, 1992
AbstractThe damping parameter is commonly used when assessing a vibration system or analysing dynamical response, as well as reducing vibration levels. A basic step towards analysing a damped system is to solve its complex eigenvalues. However, the solution is computer‐time‐consuming.
Man, Liu, Wilson, J. M.
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Study of Damped Critical Speeds and Damping Ratios of Flexible Rotors

Journal of Vibration and Acoustics, 1984
Influences of bearing damping on critical speeds of flexible rotors are investigated. First, the damped critical speed and the damping ratio of a uniform shaft supported at both ends are examined. It is shown that there exists an optimum bearing damping that gives the maximum damping ratio for each order of critical speed, and that with increasing ...
Shinobu Saito, Tsuneo Someya
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Damping mechanisms and damping ratios in vibrating unreinforced stone masonry

Engineering Structures, 2010
Abstract In seeking to understand the dynamic behaviour of historic stone structures, eight representative walls were constructed and tested under in-plane free vibration conditions. Each wall consisted of two wythes, one sandstone, one limestone, joined by a rubble core of small stones and mortar.
Abdelsamie Elmenshawi, Mohamed Sorour, Aftab Mufti, Leslie G. Jaeger, Nigel Shrive   +4 more
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Evaluation of Absolute Damping from Modal Damping Ratios

2004
In the previous chapters, we determined the natural frequencies and modal shapes for undamped structures when modeled as shear buildings. We also determined the response of these structures using the modal superposition method. In this method, as we have seen, the differential equations of motion are uncoupled by means of a transformation of ...
Mario Paz, William Leigh
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On Damping Ratio Estimation in Electronic Semi-active Suspensions

2021 American Control Conference (ACC), 2021
In semi-active suspensions, the damping force is not regulated by acting directly on the damping ratio itself, but rather on a related variable, usually a current. Unfortunately, the same current may produce different damping ratios, depending on the status of the shock absorber.
Savaresi D., Chini M., Formentin S., Konishi M., Savaresi S. M.   +4 more
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First Mode Damping Ratios for Buildings

Earthquake Spectra, 2015
Expressions for the expected value of the first mode damping ratio are derived by using 122 seismic responses from concrete buildings and 81 from steel. The results include dissipation at the soil‐structure interface and are appropriate for situations in which this source of dissipation is not included in the model.
Dionisio Bernal, Michael Döhler, Salma Mozaffari Kojidi, Kenny Kwan, Yang Liu   +4 more
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Stroke Work Damping Ratio is Increased in Trained Athletes

2021 43rd Annual International Conference of the IEEE Engineering in Medicine & Biology Society (EMBC), 2021
Athletes training is often associated with morphological changes in the heart. In this sense, the ventricular pressure-volume (PV) relation provides a complete characterization of cardiac pump performance. Regarding the arterial system (AS), arterial wall viscosity is a source of energy dissipation, that takes place during mechanical transduction. Left
Lucia Paola Lemes Coitinho, Leandro J. Cymberknop, Ignacio Farro Ventura, Fabian Martinez, Carlos Américo, Natalia Lluberas, Gabriel Parma, Julia Aramburu, Ricardo L. Armentano   +8 more
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Damping ratio of polynomials with perturbed coefficients

IEEE Transactions on Automatic Control, 1988
Let a family of polynomials be (1) \(P(s)=t_ 0s^ n+t_ 1s^{n- 1}+...+t_ n\) where ...
Soh, C. B., Berger, C. S.
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Effects of Time on Damping Ratio of Clays

1978
Laboratory tests with a Hardin oscillator were used to study the time-dependent characteristics of the damping ratio of isotropically consolidated specimens of kaolinite and calcium bentonite. Damping was determined using a steady-state method and from the decay of free vibrations.
WF Marcuson, HE Wahls
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Constant gain stabilization with a specified damping ratio and damped natural frequency

IFAC Proceedings Volumes, 1999
Abstract This paper considers the problem of stabilizing a given linear time-invariant plant with a specified damping ratio and damped natural frequency using a constant gain compensator. We show the problem to be solved can be decomposed into two sub-problems.
Ming-Tzu Ho, Aniruddha Datta, S.P. Bhattacharyya   +2 more
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