Modeling of a hydraulic damper with shear thinning fluid for damping mechanism analysis

Jiao, Shunshan; Tian, Jing; Zheng, Hui; Hu, Hua

doi:10.1177/1077546316629264

Cited by 16 publications

(17 citation statements)

References 15 publications

(18 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…0.022 for 1 Pa s oil in [14]) to large values for high viscosity oils (e.g. 0.412 for 630 Pa s oil in [16]), since the maximum damper force increases by increasing the fluid viscosity but decreases by increasing the gap width. In the present work the chosen model fluids have nominal viscosities of 100 and 500 Pa s and the relative gap width is set to h/R c = 0.120.…”

Section: Problem Definition and Governing Equationsmentioning

confidence: 99%

“…From Eq. (16) it is seen that the extra component of F ap required to overcome the inertia of the piston, M p a p , is in phase with the piston displacement (4). The plot of M p a p versus piston displacement is a straight line of slope −M p ω 2 (Fig.…”

Section: Applied Forcementioning

confidence: 99%

“…At lower frequencies the M p a p term is much smaller due to the acceleration a p being proportional to ω 2 (Eq. (16)) and hence to the square of the frequency, and the piston inertia is not felt much.…”

Section: Applied Forcementioning

confidence: 99%

“…Therefore, shear-thinning must be accounted for in theoretical studies, and a popular constitutive equation that can describe this sort of behaviour is the Carreau-Yasuda (CY) [17] model. The CY model has been used in [16] for a theoretical study of the flow in a silicone oil damper under the aforementioned simplifying assumptions of one-dimensional flow that render the problem amenable to analytical solution. Two dimensional (axisymmetric) simulations of the whole flow have also been performed, assuming silicone oil to behave as either a Newtonian [14] or a CY fluid [18], using commercial Computational Fluid Dynamics (CFD) solvers.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

2018

View full text Add to dashboard Cite

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:

show abstract

Section: Problem Definition and Governing Equationsmentioning

confidence: 99%

Section: Applied Forcementioning

confidence: 99%

Section: Applied Forcementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

2018

View full text Add to dashboard Cite

show abstract

“…However, to the authors' best knowledge, STFs are still rarely applied in structural vibration control field. To date, there are only a few reports [25][26][27][28][29][30][31] regarding the mechanical behavior of the STF dampers. Moreover, only four out of these reports were experimentally done.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on hysteretic behavior of a shear thickening fluid damper

Wei

Lin

Liu

2019

Struct Control Health Monit

View full text Add to dashboard Cite

Summary In this study, a shear thickening fluid (STF) damper was experimented upon under different loading frequencies and amplitudes to investigate its nonlinear hysteretic behavior and energy dissipation capacity. An STF sample with 20% mass fraction and dispersion medium were prepared by nanoparticle silica (SiO2) and polyethylene glycol (PEG200). By using a parallel‐plate rheometer, steady‐state experiments were carried out to characterize the rheological properties of the sample. The results indicate that the STF sample shows an abrupt increase in viscosity/stress beyond a critical shear rate/strain. The results also show that the STF sample has good reversibility, thixotropy, and stability and can be used as a smart damping material in damper devices. Also, a prototype damper was developed and manufactured. Its nonlinear hysteretic behavior and energy dissipation capacity were experimentally investigated through the responses of damping force–displacement and damping force–velocity. The results show that the STF damper has excellent damping force as the loading condition increases and the controllability can be increased up to 3.21 times. The results also show that the energy dissipation capacity formed by damping force–displacement becomes fuller as the loading condition increases. Moreover, the results show that the graphical shapes of hysteretic loops of damping force–velocity can exhibit various styles as the STF's mechanism changes but the shapes are not stable when the velocity exceeds a certain value.

show abstract

An optimization-based design approach for a novel self-adjuster using shear thickening fluid

Nagy-György

Bene

Hős

2021

Struct Multidisc Optim

View full text Add to dashboard Cite

Recently, the increasingly strict safety and emission regulations in the automotive industry drove the interest towards automatic length compensating devices, e.g., hydraulic lash adjusters (lower emission) and slack adjuster in brake systems (faster brake response). These devices have two crucial requirements: (a) be stiff during high load, while (b) be flexible in the released state to compensate for environmental effects such as wear and temperature difference. This study aims to use the advantageous properties of shear thickening fluids to develop a less complicated, cost-efficient design. The proposed design is modeled by a system of ordinary differential equations in which the effect of the non-Newtonian fluid flow is taken into account with a novel, simplified, semi-analytical flow rate-pressure drop relationship suitable for handling arbitrary rheology. The adjuster’s dimensions are determined with a multi-objective genetic algorithm based on the coupled solid-fluid mechanical model for six different shear thickening rheologies. The accuracy of the simplified flow model is verified by means of steady-state and transient CFD simulations for the optimal candidates. We have found that the dominating parameters of such devices are (a) the shear thickening region of the fluid rheology and (b) the gap sizes, while the piston diameters and the zero viscosity or the critical shear rate of the fluid have less effect. Based on the results, we give guidelines to design similar-length compensating devices.

show abstract

Modeling of a hydraulic damper with shear thinning fluid for damping mechanism analysis

Cited by 16 publications

References 15 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

Experimental investigation on hysteretic behavior of a shear thickening fluid damper

An optimization-based design approach for a novel self-adjuster using shear thickening fluid

Contact Info

Product

Resources

About