A damping estimation method based on power ratio

Wu, Biao; Liu, Weijia; Xiao-yang, WU

doi:10.1007/s00419-018-1434-2

Cited by 10 publications

(3 citation statements)

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“…From equation (1), the damping ratio based on the half-power bandwidth is expressed as (Wu et al, 2018)where λd is the half-power bandwidth, defined bywhere θd,1 and θd,2 are the half-power frequencies; θd, max is the peak frequency.…”

Section: The Damping Ratio Of Viscous Damping Modelmentioning

confidence: 99%

“…In the vibration and modal analysis of the structural system, the damping parameters should be identified first. The viscous damping model and the hysteretic damping model are the two most commonly used intrinsic damping models of structures (Wu et al, 2018; Brissonneau et al, 2021; Sun et al, 2021). The choice of the two damping models depends on the energy dissipation characteristics of the structural harmonic steady-state response, which can be obtained based on the experimental hysteretic curve.…”

Section: Introductionmentioning

confidence: 99%

“…From equation (1), the damping ratio based on the halfpower bandwidth is expressed as (Wu et al, 2018)…”

Section: Introductionmentioning

confidence: 99%

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Comparison of damping parameters based on the half-power bandwidth methods of viscous and hysteretic damping models

Sun

Wang

2021

Journal of Vibration and Control

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The half-power bandwidth method is usually used to calculate structural damping parameters by frequency response function (FRF). In this note, the half-power bandwidth methods for the displacement FRF, the velocity FRF, and the acceleration FRF are proposed based on viscous and hysteretic damping models, respectively. Comparison results show that the application conditions of half-power bandwidth methods for the displacement and acceleration FRFs are limited. They can only be used to calculate the small damping ratio/loss factor. The application condition of half-power bandwidth method for the velocity FRF is not limited. It can be used to calculate the large or small damping ratio/loss factor, which should be the first choice for calculating damping parameters. Besides, when the damping ratio is less than 0.2546 or the loss factor is less than 0.5658, the relative difference between the loss factor and twice the damping ratio is less than 10%. With the increase of the damping ratio or loss factor, the relative difference will increase rapidly, and the approximate relationship is no longer applicable.

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