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Artykuły w czasopismach na temat „Damping”

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Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 4 maja 2024

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1

Zhang, Jian, Xiang Ning Xiao, Ben Feng Gao i Chao Luo. "The Comparative Analysis of SVC and STATCOM on Subsynchronous Oscillation Mitigation". Advanced Materials Research 756-759 (wrzesień 2013): 245–49. http://dx.doi.org/10.4028/www.scientific.net/amr.756-759.245.

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The methods for subsynchronous oscillation mitigation based on SVC and STATCOM are analyzed in this paper. According to the IEEE first benchmark model, the electrical damping coefficients respectively provided by SVC and STATCOM connected at the generator terminal, as well as positive damping condition, are deduced by complex torque coefficient approach. Correlative factors which influence the two positive dampings are compared. The analysis results indicate that the positive damping provided by SVC is proportional to the size of system voltage. The positive damping provided by STATCOM is not affected by the size of system voltage, which is mostly proportional to the subsynchronous voltage produced itself. The controllers of SVC and STATCOM are designed and the positive dampings separately offered by SVC and STATCOM are optimized by phase compensation with test signal method. The time domain simulation reveals that STATCOM has stronger damping ability than SVC in the case of short circuit fault.

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2

Viet, La Duc. "On the trade-off performance curve of vibration isolation controlled by passive or adaptive dampings". Vietnam Journal of Mechanics 45, nr 2 (30.06.2023): 131–44. http://dx.doi.org/10.15625/0866-7136/18148.

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This paper addresses an on-off adaptive damping isolation, in which the damping can be frequency dependent. The comparison with the passive isolation is illustrated by the trade off performance curve, which is shown the relation between the displacement and force transmissibility. The adaptive control is based on on-off dampings and a switching frequency. The analytical optimization of the adaptive damping law can be obtained. The optimized adaptive damping control showed a remarkable improvement comparing with the passive one. At last, a self-made magnetorheological fluid is introduced to show the capability to provide the variable damping.

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3

Fan, Lei, Xiang Fang, Jiang Ming Pan, Ming Jun Fu, Lin Tao Zhang i Zhen Ru Gao. "Experiment on Damping Effects of Damping Ditch in Complex Environment". Applied Mechanics and Materials 713-715 (styczeń 2015): 228–30. http://dx.doi.org/10.4028/www.scientific.net/amm.713-715.228.

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Damping ditch is an important method to reduce blasting vibration effects. In order to investigate rules of damping trench on blasting vibration, blasting experiments of damping channel were conducted in an actual project. Meanwhile, blasting seismic waves were measured with analysis of datum. Results showed that blasting vibration intensity was distinctly reduced by using damping ditch; the spectrum of seismic waves was changed to decentralize the energy to dampen blasting vibration.

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4

Iskakov, Zharilkassin. "SIMULATION OF NON-LINEAR CHARACTERISTICS INFLUENCE DYNAMIC ON VERTICAL RIGID GYRO ROTOR RESONANT OSCILLATIONS". CBU International Conference Proceedings 6 (25.09.2018): 1094–100. http://dx.doi.org/10.12955/cbup.v6.1319.

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The influence of viscous linear and cubic nonlinear damping of an elastic support on the resonance oscillations of a vertical rigid gyroscopic unbalanced rotor is investigated. Simulation results show that linear and cubic non-linear damping can significantly dampen the main harmonic resonant peak. In non-resonant areas where the speed is higher than the critical speed, the cubic non-linear damping can slightly dampen rotor vibration amplitude in contrast to linear damping. If linear or cubic non-linear damping increase in resonant area significantly kills capacity for absolute motion, then they have little or no influence on the capacity for absolute motion in non-resonant areas. The simulation results can be successfully used to create passive vibration isolators used in rotor machines vibration damping, including gyroscopic ones.

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5

Gudmestad, Ove T. "Transient motions of an oscillating system caused by forcing terms proportional to the velocity of the structural motion". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 369, nr 1947 (28.07.2011): 2881–91. http://dx.doi.org/10.1098/rsta.2011.0107.

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Damping limits the motions of an oscillator, which is a dynamic system. The selection of formulations for damping is discussed. If the forcing of the dynamic system contains terms that are proportional to the velocity of motion of the oscillator (drag-type forcing functions), these effects will additionally contribute to dampening the oscillations. Should the total damping under certain conditions become apparently negative, the oscillations will grow until the damping has again become positive. Investigations into damping effects that apparently are negative, and discussions where apparent negative damping might appear in practical applications are of great interest.

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6

Apalara, Tijani A., Aminat O. Ige, Cyril D. Enyi i Mcsylvester E. Omaba. "Uniform stability result of laminated beams with thermoelasticity of type Ⅲ". AIMS Mathematics 8, nr 1 (2023): 1090–101. http://dx.doi.org/10.3934/math.2023054.

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<abstract><p>In this work, we study the effect of heat conduction theories pioneered by Green and Naghdi, popularly called thermoelasticity of type Ⅲ, on the stability of laminated Timoshenko beams. Without the structural (interfacial slip) damping or any other forms of damping mechanisms, we establish an exponential stability result depending on the equality of wave velocities of the system. Our work shows that the thermal effect is strong enough to stabilize the system exponentially without any additional internal or boundary dampings. The result extends some of the developments in literature where structural damping (in addition to some internal or boundary dampings) is necessary to bring about exponential stability.</p></abstract>

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7

Haro-Olmo, María Isabel, Inés Tejado, Blas M. Vinagre i Vicente Feliu-Batlle. "Fractional-Order Models of Damping Phenomena in a Flexible Sensing Antenna Used for Haptic Robot Navigation". Fractal and Fractional 7, nr 8 (15.08.2023): 621. http://dx.doi.org/10.3390/fractalfract7080621.

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In this paper, two types of fractional-order damping are proposed for a single flexible link: internal and external friction, related to the material of the link and the environment, respectively. Considering these dampings, the Laplace transform is used to obtain the exact model of a slewing flexible link by means of the Euler–Bernoulli beam theory. The model obtained is used in a sensing antenna with the aim of accurately describing its dynamic behavior, thanks to the incorporation of the mentioned damping models. Therefore, experimental data are used to identify the damping phenomena of this system in the frequency domain. Welch’s method is employed to estimate the experimental frequency responses. To determine the best damping model for the sensing antenna, a cost function with two weighting forms is minimized for different model structures (i.e., with internal and/or external dampings of integer- and/or fractional-order), and their robustness and fitting performance are analyzed.

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8

Ren, Yongsheng, i Yuhuan Zhang. "Free Vibration and Damping of Rotating Composite Shaft with a Constrained Layer Damping". Shock and Vibration 2016 (2016): 1–20. http://dx.doi.org/10.1155/2016/9045460.

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The free vibration and damping characteristics of rotating shaft with passive constrained layer damping (CLD) are studied. The shaft is made of fiber reinforced composite materials. A composite beam theory taking into account transverse shear deformation is employed to model the composite shaft and constraining layer. The equations of motion of composite rotating shaft with CLD are derived by using Hamilton’s principle. The general Galerkin method is applied to obtain the approximate solution of the rotating CLD composite shaft. Numerical results for the rotating CLD composite shaft with simply supported boundary condition are presented; the effects of thickness of constraining layer and viscoelastic damping layers, lamination angle, and rotating speed on the natural frequencies and modal dampings are discussed.

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9

Bravo, J. C. V., H. P. Oquendo i J. E. M. Rivera. "Optimal Decay Rates for Kirchhoff Plates with Intermediate Damping". TEMA (São Carlos) 21, nr 2 (22.07.2020): 261. http://dx.doi.org/10.5540/tema.2020.021.02.261.

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In this paper we study the asymptotic behavior of Kirchhoff plates with intermediate damping. The damping considered contemplates the frictional and the Kelvin-Voigt type dampings. We show that the semigroup those equations decays polynomially in time at least with the rate t^{-1/(2-2θ)}, where θ is a parameter in the interval [0,1[. Moreover, we prove that this decay rate is optimal.

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10

Avdeeva, Anna, Galina Khromova i Davran Radjibaev. "Two-axle bogie vibration damping system with additional damping elements". E3S Web of Conferences 365 (2023): 02003. http://dx.doi.org/10.1051/e3sconf/202336502003.

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There are no optimal vibration damping designs for safe movement at the present stage of the development of high-speed rail transport. The purpose of improving existing structures is their ability to simultaneously dampen both longitudinal and transverse vibrations. For dynamic research, an analytical method has been developed for calculating the stresses and deformations of the sidewall of the frame of an electric locomotive bogie in motion, taking into account the unevenness of the joints. The result of the work on creating a new design of a two-axle bogie of a railway vehicle, with additional damping elements of the vibration damping system, is the Patent of the Republic of Uzbekistan for the invention No. IAP 06498 [1]. The considered design is universal and suitable for a subway car, motor locomotive, or railcar.

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11

Shen, I. Y. "Hybrid Damping Through Intelligent Constrained Layer Treatments". Journal of Vibration and Acoustics 116, nr 3 (1.07.1994): 341–49. http://dx.doi.org/10.1115/1.2930434.

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This paper is to propose a viable hybrid damping design that integrates active and passive dampings through intelligent constrained layer (ICL) treatments. This design consists of a viscoelastic shear layer sandwiched between a piezoelectric constraining cover sheet and the structure to be damped. According to measured vibration response of the structure, a feedback controller regulates axial deformation of the piezoelectric layer to perform active vibration control. In the meantime, the viscoelastic shear layer provides additional passive damping. The active damping component of this design will produce adjustable and significant damping. The passive damping component of this design will increase gain and phase margins, eliminate spillover, reduce power consumption, improve robustness and reliability of the system, and reduce vibration response at high frequency ranges where active damping is difficult to implement. To model the dynamics of ICL, an eighth-order matrix differential equation governing bending and axial vibrations of an elastic beam with the ICL treatment is derived. The observability, controllability, and stability of ICL are discussed qualitatively for several beam structures. ICL may render the system uncontrollable or unobservable or both depending on the boundary conditions of the system. Finally, two examples are illustrated in this paper. The first example illustrates how an ICL damping treatment, which consists of an idealized, distributed sensor and a proportional-plus-derivative feedback controller, can reduce bending vibration of a semi-infinite elastic beam subjected to harmonic excitations. The second example is to apply an ICL damping treatment to a cantilever beam subjected to combined axial and bending vibrations. Numerical results show that ICL will produce significant damping.

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12

Golovin, Igor S. "Damping Mechanisms in High Damping Materials". Key Engineering Materials 319 (wrzesień 2006): 225–30. http://dx.doi.org/10.4028/www.scientific.net/kem.319.225.

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Different viewpoints at high damping materials - from engineering needs to physical mechanisms are discussed. It is suggested that only several mechanisms in metallic materials can lead to high intrinsic damping capacity while some other “peak-like” effects are not sufficient to make high damping materials.

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13

Adhikari, S. "Damping modelling using generalized proportional damping". Journal of Sound and Vibration 293, nr 1-2 (maj 2006): 156–70. http://dx.doi.org/10.1016/j.jsv.2005.09.034.

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14

Bonnet, Laurent. "Damping material, damping arrangement and method for designing a damping arrangement". Journal of the Acoustical Society of America 123, nr 5 (2008): 2469. http://dx.doi.org/10.1121/1.2921177.

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15

Khamas, Ihsan Jabar, i Hameed D. Lafta. "Effect of Heat Treatments and Carbon Content on the Damping Properties of Structural Steel". Journal of Engineering 29, nr 7 (1.07.2023): 106–19. http://dx.doi.org/10.31026/j.eng.2023.07.07.

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Low- and medium-carbon structural steel components face random vibration and dynamic loads (like earthquakes) in many applications. Thus a modification to improve their mechanical properties, essentially damping properties, is required. The present study focuses on improving and developing these properties, significantly dampening properties, without losing the other mechanical properties. The specimens used in the present study are structural steel ribbed bar ISO 6935 subjected to heating temperatures of (850, 950, and 1050) ˚C, and cooling schemes of annealing, normalizing, sand, and quenching was selected. The damping properties of the specimens were measured experimentally with the area under the curve for the loading and unloading paths experienced from the tensile test. Considering the effect of different parameters on the damping properties, such as heat treatment temperatures, cooling rates, and carbon content, the results show that the damping properties in the annealing process at different temperatures have interesting damping properties, among other processes. Also, the highest damping energy for the annealing cooling scheme was attained at a heating temperature of 1050 ˚C, irrespective of the carbon content. Finally, better damping properties for the medium carbon content of (0.299%C) is achieved for all types of heat treatment process compared with a low carbon content of (0.188% C); and, in general, with increasing carbon content from medium to low, steel response to heat treatment increases and better damping properties are obtained.

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16

Popov, G. "Theoretical Analysis of Damping Properties of two-Degree-of-Freedom Linear Vibrational Systems". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 210, nr 1 (styczeń 1996): 79–90. http://dx.doi.org/10.1243/pime_proc_1996_210_172_02.

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Analytical solutions for complete two-degree-of-freedom (2 DOF) vibrational systems comprising primary and secondary resilient and damping elements and subjected to a harmonic base excitation are obtained for the first time and presented in terms of transmissibility of primary and secondary mass and resonance and invariant frequencies of primary mass, which is considered to be the object of isolation. Analytical expressions for optimum values of main system parameters including primary and secondary dampings, mass ratio and secondary and primary springs stiffness ratios are also newly presented. Damping properties of systems are analysed for the case of a constant optimum damping, which minimizes the primary mass transmissibility at the lowest resonance frequency, and for the case of frequency-variable optimum damping, providing the minimization over the entire range of forced frequency. The expressions for optimum primary and secondary dampings are given in the form of quadratic algebraic equations for the case of complete 2 DOF systems. The influence of the mass and spring stiffness ratios on the system response is investigated as well. The obtained results, being of a general nature and obtained for large ranges of main parameters, can be applied to different classes of vibration isolation problems, such as isolation of a large item of machinery, a light piece of instrumentation or a ground vehicle.

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17

He, Wei, Kewen He, Cunxu Yao, Peng Liu i Chao Zou. "Comparison of damping performance of an aluminum bridge via material damping, support damping and external damping methods". Structures 45 (listopad 2022): 1139–55. http://dx.doi.org/10.1016/j.istruc.2022.09.089.

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18

Evertz, Rick, Damien G. Hicks i David T. J. Liley. "Alpha blocking and 1/fβ spectral scaling in resting EEG can be accounted for by a sum of damped alpha band oscillatory processes". PLOS Computational Biology 18, nr 4 (15.04.2022): e1010012. http://dx.doi.org/10.1371/journal.pcbi.1010012.

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The dynamical and physiological basis of alpha band activity and 1/fβ noise in the EEG are the subject of continued speculation. Here we conjecture, on the basis of empirical data analysis, that both of these features may be economically accounted for through a single process if the resting EEG is conceived of being the sum of multiple stochastically perturbed alpha band damped linear oscillators with a distribution of dampings (relaxation rates). The modulation of alpha-band and 1/fβ noise activity by changes in damping is explored in eyes closed (EC) and eyes open (EO) resting state EEG. We aim to estimate the distribution of dampings by solving an inverse problem applied to EEG power spectra. The characteristics of the damping distribution are examined across subjects, sensors and recording condition (EC/EO). We find that there are robust changes in the damping distribution between EC and EO recording conditions across participants. The estimated damping distributions are found to be predominantly bimodal, with the number and position of the modes related to the sharpness of the alpha resonance and the scaling (β) of the power spectrum (1/fβ). The results suggest that there exists an intimate relationship between resting state alpha activity and 1/fβ noise with changes in both governed by changes to the damping of the underlying alpha oscillatory processes. In particular, alpha-blocking is observed to be the result of the most weakly damped distribution mode becoming more heavily damped. The results suggest a novel way of characterizing resting EEG power spectra and provides new insight into the central role that damped alpha-band activity may play in characterising the spatio-temporal features of resting state EEG.

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19

Utsunomiya, Kenji. "ELEVATOR VIBRATION DAMPING SYSTEM HAVING DAMPING CONTROL". Journal of the Acoustical Society of America 131, nr 3 (2012): 2347. http://dx.doi.org/10.1121/1.3696826.

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20

ADHIKARI, S., i J. WOODHOUSE. "IDENTIFICATION OF DAMPING: PART 1, VISCOUS DAMPING". Journal of Sound and Vibration 243, nr 1 (maj 2001): 43–61. http://dx.doi.org/10.1006/jsvi.2000.3391.

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21

العمار, مهدي اااا, فاطمة عبد الحسين مجبل i ميادة فرحان اااا. "التحري عن النشاط التضادي لبكتريا Bacillus subtilus في نمو بعض الأحياء المجهرية المرضية". Kufa Journal For Veterinary Medical Sciences 1, nr 2 (30.12.2010): 40–51. http://dx.doi.org/10.36326/kjvs/2010/v1i24055.

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The study concluded the discovery and investigation of the ability of bacteria bacillus subtilus to produce the secondary metabolism ( antibiotic ) and to consider its activity in dampening the growth of pathogenic microorganism which is represented by (Klebsiella pneumonia , Escherichia coli , Pseudomonas aerogenosa , and Staphellococcus aureus) and fungi, yeast e.g. (Candida albicansg, Cryptococcus neoformans). We also used different consentration from CFU in the contrastive study . The activity increased to reach its maximum at the concentration 100 mg/ ml which has the ability to dampen all types of bacteria by diameters dampening which ranged from (0.9-20) mm , while the fungi and yest diameter damping which ranged from (18.6-30.2) mm. And also the value of MIC and MBC was specified.

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22

العمار, مهدي اااا, فاطمة عبد الحسين مجبل i ميادة فرحان اااا. "التحري عن النشاط التضادي لبكتريا Bacillus subtilus في نمو بعض الأحياء المجهرية المرضية". Kufa Journal For Veterinary Medical Sciences 1, nr 2 (30.12.2010): 40–51. http://dx.doi.org/10.36326/kjvs/2010/v1i24055.

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The study concluded the discovery and investigation of the ability of bacteria bacillus subtilus to produce the secondary metabolism ( antibiotic ) and to consider its activity in dampening the growth of pathogenic microorganism which is represented by (Klebsiella pneumonia , Escherichia coli , Pseudomonas aerogenosa , and Staphellococcus aureus) and fungi, yeast e.g. (Candida albicansg, Cryptococcus neoformans). We also used different consentration from CFU in the contrastive study . The activity increased to reach its maximum at the concentration 100 mg/ ml which has the ability to dampen all types of bacteria by diameters dampening which ranged from (0.9-20) mm , while the fungi and yest diameter damping which ranged from (18.6-30.2) mm. And also the value of MIC and MBC was specified.

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23

Son, Taehwan, Seongmin Park i Wonju Jeon. "Damping vibration of platform structure using modified acoustic black holes". Journal of the Acoustical Society of America 154, nr 4_supplement (1.10.2023): A200. http://dx.doi.org/10.1121/10.0023259.

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We propose waveguide absorbers (WGAs) to dampen structural vibrations of platforms supporting vibrating systems. The waveguide absorber is designed by modifing a spiral acoustic black hole (ABH) to improve its damping performance while saving installation space and weight. The proposed WGA absorbs the flexural wave propagating in a platform to its end, resulting in vibration damping in the platform. To maximize the damping capability of WGA, we analyze the structural intensity field of the platform and attach the WGA based on the intensity field. Numerical and experimental results show that large reductions of peaks in mobility are achieved using the WGAs, showing the possibility to utilize the WGA in practice.

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24

Jaskot, A. "Analysis of vibrations in a dynamic damper". IOP Conference Series: Materials Science and Engineering 1252, nr 1 (1.09.2022): 012070. http://dx.doi.org/10.1088/1757-899x/1252/1/012070.

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Abstract The problem of damping mechanical vibrations has been described in the paper. The subject of the research is a dynamic damper consisting of two steel plates and cuboid rubber blocks to dampen vibrations. The upper plate is subjected to forcing, causing the disturbance to propagate. This disturbance will propagate through the top plate and will pass through the damping material to the bottom plate. The damping elements have been modelled from Mooney-Rivlin material. The aim of the work is to investigate the propagation of vibrations and damping of vibrations and to assess the effects resulting from the selection of material constants with the assumed geometry of the tested system. The results included in the work have been obtained based on a comparative analysis, taking into account the linear material and the nonlinear material. Numerical tests have been carried out with the use of ANSYS software.

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25

Heo, B., H. Bittner, M. L. Shumway i I. Y. Shen. "Identifying Damping of a Gyroscopic System Through the Half-Power Method and Its Applications to Rotating Disk/Spindle Systems". Journal of Vibration and Acoustics 121, nr 1 (1.01.1999): 70–77. http://dx.doi.org/10.1115/1.2893950.

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This paper applies the half-power method to identify damping of a gyroscopic system. At first, the underlying principle of the half-power method for damped, gyroscopic systems is explained. Then the method is demonstrated on a rotating disk/spindle system often used in computer hard disk drives. The disk/spindle system consists of multiple elastic disks mounted on a rigid spindle supported by ball bearings. The flexibility of the bearings allows the spindle to undergo rigid-body translation and rocking. Calibrated experiments were conducted in vacuum to obtain frequency response functions at different rotational speed. Application of the half-power method shows that the disk and bearing dampings are independent of rotational speed and can be modeled adequately as viscous damping. Moreover, the damping of the ball bearings is two orders of magnitude smaller than that of a fluid-film bearing of similar size.

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26

Kim, Kyoung-Whan, i Hyun-Woo Lee. "Chiral damping". Nature Materials 15, nr 3 (24.02.2016): 253–54. http://dx.doi.org/10.1038/nmat4565.

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ＳＡＴＯ, Ｔａｋａｈｉｒｏ. "Damping Adhesives". Journal of The Adhesion Society of Japan 40, nr 8 (2004): 340–44. http://dx.doi.org/10.11618/adhesion.40.340.

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28

Wesson, John. "Landau damping". Physics of Plasmas 22, nr 2 (luty 2015): 022519. http://dx.doi.org/10.1063/1.4913426.

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29

Fay, Temple H. "Quadratic damping". International Journal of Mathematical Education in Science and Technology 43, nr 6 (15.09.2012): 789–803. http://dx.doi.org/10.1080/0020739x.2011.622806.

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30

Fay, Temple H. "Coulomb damping". International Journal of Mathematical Education in Science and Technology 43, nr 7 (15.10.2012): 923–36. http://dx.doi.org/10.1080/0020739x.2011.633624.

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31

Nashif, A. D., D. I. G. Jones, J. P. Henderson i H. Saunders. "Vibration Damping". Journal of Vibration and Acoustics 109, nr 1 (1.01.1987): 124–25. http://dx.doi.org/10.1115/1.3269385.

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32

Squire, Patrick T. "Pendulum damping". American Journal of Physics 54, nr 11 (listopad 1986): 984–91. http://dx.doi.org/10.1119/1.14838.

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33

Hagbjer, Gunnar. "Structural damping". Journal of the Acoustical Society of America 80, nr 2 (sierpień 1986): 711. http://dx.doi.org/10.1121/1.393989.

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Chung, Kwong T. "Damping material". Journal of the Acoustical Society of America 80, nr 6 (grudzień 1986): 1868. http://dx.doi.org/10.1121/1.394204.

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35

Goodwin, M. J. "Vibration damping". Journal of Mechanical Working Technology 13, nr 3 (październik 1986): 380–81. http://dx.doi.org/10.1016/0378-3804(86)90030-6.

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36

Antes, H. "“Vibration damping”". Finite Elements in Analysis and Design 3, nr 1 (kwiecień 1987): 80–81. http://dx.doi.org/10.1016/0168-874x(87)90035-7.

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37

Powell, Michael D., i T. N. Vijaykumar. "Pipeline damping". ACM SIGARCH Computer Architecture News 31, nr 2 (maj 2003): 72–83. http://dx.doi.org/10.1145/871656.859628.

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38

Drummond, W. E. "Landau damping". Physics of Plasmas 11, nr 2 (luty 2004): 552–60. http://dx.doi.org/10.1063/1.1628685.

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39

Mouhot, C., i C. Villani. "Landau damping". Journal of Mathematical Physics 51, nr 1 (styczeń 2010): 015204. http://dx.doi.org/10.1063/1.3285283.

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Carlstedt, Robert P. "Damping structure". Journal of the Acoustical Society of America 115, nr 5 (2004): 1868. http://dx.doi.org/10.1121/1.1757146.

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Griffey, Kevin W. "Magnetic damping". Journal of the Acoustical Society of America 121, nr 2 (2007): 684. http://dx.doi.org/10.1121/1.2640135.

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Benahmed, Baizid, Malek Hammoutene i Donatello Cardone. "Effects of Damping Uncertainties on Damping Reduction Factors". Periodica Polytechnica Civil Engineering 61, nr 2 (28.11.2016): 341. http://dx.doi.org/10.3311/ppci.9665.

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Streszczenie:

It is apparent that the dynamic response of a building dependson its energy dissipation capacity, hence damping ratio. Thedamping value experienced by a building during an earthquakediffers significantly from the value specified in the design step.This introduces uncertainties in the design process of the building.It would be desirable to consider not only the effects ofuncertainties in loading but also the uncertainties in the structuralparameters. In this paper, the effects of uncertainties in the estimation ofdamping ratio ξ, on the use of Damping Reduction Factors (DRF) for the evaluation of high damping response spectra,are examined. Damping uncertainties are described by a lognormalprobability distribution, and the Monte Carlo techniqueis used to generate the random values of damping. Theaverage of the distribution is the deterministic value of damping (taken equal to 5%, 7.5%, 10%, 20%, 30% and 40%) whilethree different values of coefficient of variation are considered (i.e. 10%, 20% and 40%, respectively). All the DRF formulations found in the literature are not able totake into consideration damping uncertainties, leading to significantdiscrepancies in the high damping response spectra. Based on the results of this study, a new DRF formulation, ableto account for uncertainties in damping estimation, is tentatively proposed.

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43

MAE, Yoshiharu. "Damping mechanism and its characteristics of damping alloys." Journal of the Japan Society for Precision Engineering 55, nr 12 (1989): 2123–26. http://dx.doi.org/10.2493/jjspe.55.2123.

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Tian, Yaogang, Dong Lu, Jianwei Zhou, Yuxuan Yang i Zhenjun Wang. "Damping Property of Cement Mortar Incorporating Damping Aggregate". Materials 13, nr 3 (9.02.2020): 792. http://dx.doi.org/10.3390/ma13030792.

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This study proposes a new cement mortar incorporating damping aggregate (DA) and investigates the mechanical properties and damping property of the cement mortar. Four types of DA were prepared, lightweight aggregate presaturated water and three types of polymer emulsion. Further, the effects of polypropylene fiber and rubber powder on the performance of the cement mortar were studied. The experimental results showed that the damping ratio of specimens containing 70% DA was approximately three times higher than that of the reference mortar, with a slight decrease in the mechanical properties. Adding fiber was more effective than rubber powder in improving the damping ratio of the cement mortar, and the optimal dosage of fiber was 0.5%.

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WATANABE, Eri, i Masato SAEKI. "2007 Study on Damping Model of Particle Damping". Proceedings of Conference of Kanto Branch 2012.18 (2012): 105–6. http://dx.doi.org/10.1299/jsmekanto.2012.18.105.

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Yin, Zhihong, Amir Khajepour, Dongpu Cao, Babak Ebrahimi i Konghui Guo. "Pneumatic suspension damping characterisation with equivalent damping ratio". International Journal of Heavy Vehicle Systems 19, nr 3 (2012): 314. http://dx.doi.org/10.1504/ijhvs.2012.047919.

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Nemoto, Hirotomi. "Damping method and damping system for hybrid vehicle". Journal of the Acoustical Society of America 124, nr 3 (2008): 1392. http://dx.doi.org/10.1121/1.2986181.

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Eguchi, Hajime, Hiromitsu Masuda i Eiji Soga. "Improvement of damping performance by splitting damping material". Microsystem Technologies 17, nr 9 (17.08.2011): 1497–503. http://dx.doi.org/10.1007/s00542-011-1340-9.

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ADHIKARI, S., i J. WOODHOUSE. "IDENTIFICATION OF DAMPING: PART 2, NON-VISCOUS DAMPING". Journal of Sound and Vibration 243, nr 1 (maj 2001): 63–88. http://dx.doi.org/10.1006/jsvi.2000.3392.

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Lee, Chin-Long. "Proportional viscous damping model for matching damping ratios". Engineering Structures 207 (marzec 2020): 110178. http://dx.doi.org/10.1016/j.engstruct.2020.110178.

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