Damping Ratios
A comparison between modal damping ratios identified by NExT-ERA and frequency domain impact test
... Time domain methods maintain many advantages over their frequency domain counterparts and this fact is the main motivation for this study. For example, there is no need to record the excitation data in time domain ...
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A spectral pedestrian-based approach for modal identification
... The dynamic behaviour of footbridges is characterised by modal properties such as natural frequencies, mode shapes, damping ratios and modal masses. Their estimation via modal tests often requires expensive ...
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Influence of Seismic Pounding on RC Buildings with and without Base Isolation System Subject to Near-Fault Ground Motions
... different damping ratios have also been used in recent numerical studies at FEUP by Cordeiro [11] and by Vasconcelos [12], in their parametric studies of pounding between adjacent ...of damping ratio ...
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Progressive Collapse of Steel Frames
... Nonlinear finite element models investigating the progre- ssive collapse of steel frames have been developed and reported in this paper. The finite element models have accounted for the nonlinear material of the steel ...
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Research on fsi effect of passive cooling storage of nuclear island building subjected to seismic loadings
... different damping ratios, the analysis shows that the amplification effect of FSI with low damping ratio is more obvious in low frequency ...low damping ratio, the adverse effect of FSI should ...
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Longitudinal Automatic landing System - Design for CHARLIE Aircraft by Root-Locus
... given damping ratios, the step responses of the closed loop system with the controller gain are drawn corresponding to K values and rising time, settling time and overshoot are shown in table 3: ...
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Dynamic Modeling of Vehicles and Damper
... The frequency response function of the sprung mass of the quarter car model is shown in Figure 3. It can be seen that there is a single peak in the FRF for all of the damping ratios examined. This peak ...
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Multifunctional Materials of Polyurethane/Buckypaper for Structural Vibration Damping and Strain Sensing
... the damping properties of such composites. It was found that the damping ratio of the Polyurethane/Buckypaper composites is higher than each of their individual ...the damping ratios are ...
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RULES REDUCTION AND OPTIMIZATION OF FUZZY LOGIC MEMBERSHIP FUNCTIONS FOR INDUCTION MOTOR SPEED CONTROLLER
... and damping ratios) between non-adaptive (fixed-parameter) and adaptive (wavelet neural network-based) controllers of the system in Figure 6 for a range of contingencies and operating ...
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... Sensing techniques based on accelerometers for modal parameters identification are among the most studied and applied in Structural Health Monitoring of civil structures. The advent of low-cost MEMS accelerometers and ...
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One Single Horizontal Seismic Analysis of FBR Core
... We can not get the shock stiffness and the structural damping because of the leak of the necessary experiments. Some assumed parameters are adopted in this paper. The sensitivity analyses of the parameters have ...
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Damage Testing Of Civil Engineering Structures by Vibration Monitoring
... damping ratios employed in frame structures, a non- proportional viscous model was adopted in analyses as it is more general compared to the Rayleigh’s ...that damping can be considered of ...
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Instrumentation and Modal Modeling of a Commercial Wind Turbine
... Additionally, it is used to evaluate the modal properties of the mast such as its natural frequencies, mode shapes, and damping ratios that will be used to assist in the design of the mo[r] ...
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Evaluation Damping Performance for Hydrostatic Bearing Film by Damping Ratio Scaling
... and damping ratio by using curve fitting and ...measure damping coefficient in an equipment or a machine are departed into time domain and frequency domain approaches, the former gets responses one by one ...
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Loop acoustics with damping
... In a previous SMiRT-20 paper, four one dimensional pipe models with time dependent boundary conditions were developed to be able to predict pump pulsations throughout an acoustic loop. However, this analysis was for ...
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Damping Measurement for a steam generator tube with several gap supports in air and water
... Analytical models in equation 1 through 4 may be drawn by reflecting material properties and geometry data of specimen. Figure 10 shows our test data, Pettigrew’s data and prediction line by analytical models. Whole test ...
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Test and Parameters Design of a Novel Reinforced Cymene-Si-Oil Isolator for Reinforcement Scheme of Flimsy Equipment System in Moving Conveyances
... Duffing spring [5]. Atanackovic and Spasic discussed viscoelastic compliant contact-impact models [6], while Chandra, et al. discussed the response of the dissipative isolator with combined viscous damping, cubic ...
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Viscoelastic damping of beams
... because they neglected the on acting was primarily the modulus higher Based have [5,6], the the the elastic relation end conditions by Asnani and Nakra elastic the of and Ross, Kerwin, l[r] ...
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Collisional dissipation of Alfvén waves in a partially ionised solar chromosphere
... The numerical data agrees best with the analytical estimates when α is smallest (see Fig. 6). For this profile we can see that the two approaches agree in the middle of the frequency range, but disagree at low and high ...
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Experimental Investigation of Damping characteristics for various Damping Materials
... passive damping can be achieved by addition of viscous fluid to the active damper, which guaranties a failsafe damper in case of power ...passive damping effect as a passive ...high damping rubber ...
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