Comparison of Modeling Approaches for Full-scale Nonlinear Viscous Dampers

Yun, Hae‐Bum; Tasbighoo, F.; Masri, Sami F.; Caffrey, John; Wolfe, Raymond W.; Makris, Nicos; Black, Cameron J.

doi:10.1177/1077546307079396

Cited by 24 publications

(13 citation statements)

References 19 publications

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“…The plots of F ap shown in Fig. 20 are in qualitative agreement with experimental data for viscous dampers found in the literature [14][15][16], and even for magnetorheological dampers [24,3,20,8,25] (these employ elastoviscoplastic fluids, but plasticity has similar effects to shear-thinning as far as the damper force is concerned). In these studies there is a prominent elastic hysteresis at low velocities in force-velocity diagrams, which is not predicted by simulations with the Carreau-Yasuda model.…”

Section: Applied Forcesupporting

confidence: 87%

“…Among these three rheological models, the one whose predictions qualitatively match better the experimental results available in the literature (e.g. [14][15][16]) is the PTT viscoelastic model. The Newtonian model is completely inaccurate, while the CY model fails to predict the stiffness characteristics of the damper behaviour and cannot account for a further force reduction due to elasticity.…”

Section: Discussionmentioning

confidence: 62%

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Theoretical study of the flow in a fluid damper containing high viscosity silicone oil: Effects of shear-thinning and viscoelasticity

2018

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The flow inside a fluid damper where a piston reciprocates sinusoidally inside an outer casing containing high-viscosity silicone oil is simulated using a Finite Volume method, at various excitation frequencies. The oil is modelled by the Carreau-Yasuda (CY) and Phan-Thien & Tanner (PTT) constitutive equations. Both models account for shear-thinning but only the PTT model accounts for elasticity. The CY and other generalised Newtonian models have been previously used in theoretical studies of fluid dampers, but the present study is the first to perform full two-dimensional (axisymmetric) simulations employing a viscoelastic constitutive equation. It is found that the CY and PTT predictions are similar when the excitation frequency is low, but at medium and higher frequencies the CY model fails to describe important phenomena that are predicted by the PTT model and observed in experimental studies found in the literature, such as the hysteresis of the force-displacement and force-velocity loops. Elastic effects are quantified by applying a decomposition of the damper force into elastic and viscous components, inspired from LAOS (Large Amplitude Oscillatory Shear) theory. The CY model also overestimates the damper force relative to the PTT, because it underpredicts the flow development length inside the piston-cylinder gap. It is thus concluded that (a) fluid elasticity must be accounted for and (b) theoretical approaches that rely on the assumption of one-dimensional flow in the piston-cylinder gap are of limited accuracy, even if they account for fluid viscoelasticity. The consequences of using lower-viscosity silicone oil are also briefly examined. This is the accepted version of the article published in:

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Section: Applied Forcesupporting

confidence: 87%

Section: Discussionmentioning

confidence: 62%

Theoretical study of the flow in a fluid damper containing high viscosity silicone oil: Effects of shear-thinning and viscoelasticity

2018

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“…In engineering practice, passive control systems are widely used because of their simplicity, reliability, and the low cost of installing and maintaining them. Some passive structural systems, including metallic yielding (Kamura et al., 2000), tuned mass dampers (Setareh et al., 2006), friction dampers, and viscous damping systems (Xu et al, 2010; Yun et al., 2008), have been introduced as possible solutions to these problems (Aiken et al., 1992). Another type of bracing system commonly used in the structures are buckling restrained braces (BRBs).…”

Section: Introductionmentioning

confidence: 99%

Seismic performance of ribbed bracing system in passive control of structures

Arzeytoon

Golafshani

Toufigh

et al. 2015

Journal of Vibration and Control

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In this article, a novel passive control system, ribbed bracing system (RBS), has been proposed to deal with the buckling problem. RBS is a bracing system with a simple mechanism that can be installed in braces as a supplemental part. The behavior of RBS is similar to that of conventional braces under tensile loading. However, under compressive force, it endures an insignificant force and prevents the braces from buckling through length reduction. In addition, seismic damage is concentrated in the bracing system of the structures equipped with RBS, decreasing the dissipated hysteretic energy in other structural members. There are two different mechanisms for RBS: 1) completely-closed RBS (CC-RBS) and 2) self-centering RBS (SC-RBS). The concept and mechanics of RBS have been verified by the results obtained from cyclic testing and numerical analysis of RBS specimens. In this research, after describing the mechanical configuration of RBS, nonlinear time history analysis has been conducted on 3-story and 6-story concentrically braced frames subjected to different seismic intensity levels, design basis earthquakes (DBE), and maximum considered earthquakes (MCE). The analyses have been performed on different types of bracing systems as follows: SC-RBS, CC-RBS, and Buckling Restrained Braces (BRB). The results show that SC-RBS frames have negligible residual story drifts, and maximum displacement in CC-RBS is slightly lower than that of BRB. Additionally, distribution of input energy into the structure was considered and showed that RBS frames demonstrate a high hysteretic energy dissipation, which results in lower demands in other structural elements.

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“…Since the single-sensor ad hoc analysis is conducted at the individual sensor channel level, the data summarization methodology can be utilized with a distributed sensor network, which is robust enough to withstand unpredictable and unavoidable instrument failures. The data summarization methodology associated with the spike trains has many advantages in hazard monitoring applications under field conditions over conventional model-based analysis or multi-sensor approaches 14,15,16 , including data summarization, selective sensing, wide applicability, data standardization, distributed sensing, and low sensing cost.…”

Section: Discussionmentioning

confidence: 99%

A novel model-free data processing technique for ad hoc analysis in monitoring for heterogeneous infrastructure networks

Sundaresan

Yun

Kim³

et al. 2013

SPIE Proceedings

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The development of data processing algorithms that enhance pattern detectability for civil infrastructure systems exposed to the environment is critical in various monitoring applications for construction, operation, maintenance, and hazard detection. For example, the precise detection of snow/ice forming on road pavement surface is essential for transportation safety. Another example is monitoring precipitation effects for the structural safety of retaining walls. Ad hoc analysis of streamed data involves processing complicated, non-stationary and nonlinear multi-physics behaviors of coupled interactions between civil systems and various surrounding factors. However, it is sometimes impossible to measure all the significant factors that influence the system's behavior. In addition, monitoring costs can be exorbitant, limiting the amount of resources used. Therefore, the modeling of these coupled interactions is usually very difficult.The Auto Modulating Pattern Detection Algorithm (AMP) is a novel data processing algorithm that extends the original EMD-HHT method to detect a "small" but important intermittent event of interest that is usually masked by "dominant" environmental disturbances in various monitoring applications. With AMP, higher detectability can be achieved by: (1) amplifying the amplitude of the pattern-changing event's frequency characteristics in the time-frequency domain, (2) reducing the baseline frequency fluctuation in the time-frequency domain, and (3) increasing the temporal resolution of the energy-time-frequency domain signal. This study demonstrates AMP's applicability to various monitoring applications in operation and maintenance: monitoring structural safety for retaining walls and monitoring meteorological hazards on road pavement surface under field conditions for traffic safety.

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Comparison of Modeling Approaches for Full-scale Nonlinear Viscous Dampers

Cited by 24 publications

References 19 publications

Theoretical study of the flow in a fluid damper containing high viscosity silicone oil: Effects of shear-thinning and viscoelasticity

Theoretical study of the flow in a fluid damper containing high viscosity silicone oil: Effects of shear-thinning and viscoelasticity

Seismic performance of ribbed bracing system in passive control of structures

A novel model-free data processing technique for ad hoc analysis in monitoring for heterogeneous infrastructure networks

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