نتایج جستجو برای: bearing damping

تعداد نتایج: 96944  

امیرحسینی, طاهره, عابدینی, عباس,

Slow magneto-acoustic waves are often observed in polar plumes and active region fan loops. The observed periodicities of these waves are in the range of 1- 40 minutes. Mainly, the ratio of damping time to the oscillation period is less than 2 (equal to the ratio damping length to the wave length), which corresponds to the strong damping regime. In general, slow magneto-acoustic waves can be da...

In the current study the influence of weight percentage of HIPS, weight percentage of CNT and hardener content on damping 1st and damping 2nd properties of epoxy/HIPS/CNT hybrid composite wase valuated. Mixture design methodology was employed to generate mathematical models for predicting damping 1st and damping 2nd behaviors of new mentioned hybrid nanocomposite as function of physical factors...

Journal: :iranian journal of mechanical engineering transactions of the isme 0
anooshivan farshid far associate professor, department of mechanical engineering ferdowsi university of mashhad h. zanganeh

in the present paper the behavior of an elastically mounted cylinder in low and high mass-damping ratio is investigated. for high mass-damping ratio, a classical wake oscillator model is used. at the first, by neglecting all damping and nonlinear terms of this model, the possibility of using a linear model for determination of the lock-in range and the dominant mode is investigated. then, witho...

Journal: :Review of Scientific Instruments 2023

For precise measurement of the moment inertia (MOI) asymmetric objects, using an air bearing torsional pendulum, nonlinearity torsion bar and damping effect caused by interaction between sample need to be included in analysis. The instantaneous undamped natural frequency coefficient motion are obtained from Hilbert transform angular displacement signal used for data fitting calculate MOI. Measu...

2007
Yana Volkovich Nelly Litvak Debora Donato

We study the relation between PageRank and other parameters of information networks such as in-degree, out-degree, and the fraction of dangling nodes. We model this relation through a stochastic equation inspired by the original definition of PageRank. Further, we use the theory of regular variation to prove that PageRank and in-degree follow power laws with the same exponent. The difference be...

2005
A. Massafferri

We present a four-body semileptonic charm decay D → Kπμν analysis in the range of 0.65 GeV/c < mKπ < 1.5 GeV/c . We observe a low mass scalar contribution of 5.30 ± 0.74 0.99 − 0.96% with respect to the total D →Kπμν decay, compatible with the phase shift found by the LASS elastic scattering experiment. For the K(892) resonance, we obtain a mass of 895.41 ± 0.32 − 0.43 MeV/c , a width of 47.79 ...

Journal: :journal of operation and automation in power engineering 2007
n. bigdeli e. ghanbaryan k. afshar

in this paper, the unified power flow controller (upfc) is enhanced with a chaotic particle swarm optimization (cpso) damping controller in order to mitigate the low frequency oscillations (lfo) in a single machine infinite bus (smib) power system. the designed damping controller is an optimized lead-lag controller, which extracts the speed deviation of the generator rotor and generates the out...

Seismic isolation is a method to reduce the destructive effects of earthquakes on a structure in which the structure is separated from its foundation by devices called seismic isolators. As a result, the horizontal movements of the earthquake transmitted to the structure are reduced. The seismic isolation is used for both newly constructed structures as well as for retrofitting the existing bui...

Journal: :Mechanical Systems and Signal Processing 2022

This paper presents measurements of the motion amplitudes from flexibly supported Herringbone Grooved Journal Bearing bushings. Measurements taken in four locations on bearing bushing enable distinction between radial and tilting motion, which allowed to identify an unstable mode. The instability can be attributed cross-coupled impedance gas its occurrence is characterized by appearance a sub-s...

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