A Model of Adhesion Excited Micro-vibrations

Stoimenov, Boyko; Mukai, Toshiharu

doi:10.1007/s11249-007-9290-1

Cited by 4 publications

(2 citation statements)

References 14 publications

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“…Excitation can also be provided by a fluctuating adhesion force. This can happen when junctions are formed and sheared between the surfaces and is described in a previous paper [31] on the mechanism of adhesion excited micro-vibrations. While the energy loss mechanism is essentially the same, the input to the system is imposed displacement in the case of roughness excitation and imposed force, in the case of adhesion excitation.…”

Section: Notes On the Excitationmentioning

confidence: 93%

Bioengineering Materials and Conditions for Obtaining Low Friction with PVA Hydrogels

Stoimenov¹,

Fridrici²,

Kapsa³

et al. 2013

Tribology Online

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Biological materials that make up the body organs and tissues are soft, wet and visco-elastic. Hydrogels can mimic these aspects and show promise for bio-medical applications. Their tribological properties are very important for promising applications such as artificial cartilage and bio-models for endovascular surgery training. The present study investigates the friction of polyvinyl alcohol (PVA) hydrogel against nine different metallic and non-metallic bio-compatible engineering materials likely to occur as countermaterials in these two applications. All the materials exhibited a characteristic velocity-dependent peak friction coefficient. Comparing the peaks, we find that lowest peak friction coefficient is produced by ceramics and glass (µ < 0.05), followed by metal alloys (µ < 0.05-0.08) and highest for polymers (0.4 < µ < 1.5), including PTFE which typically has very low-adhesion. Our results suggest that to achieve low friction, polymers should be avoided as a counter-material to PVA-hydrogels. It is also shown that PVA surface roughness is critical for achieving early transition to elasto-hydrodynamic lubrication and low friction, as shown in our comparative calculations with two different values of surface roughness of the gel. In the mixed lubrication region, the general trend is for friction to increase with roughness of the counterbody, but internal damping properties and adhesion also play important role, as shown by a simple linear model fit.

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Section: Notes On the Excitationmentioning

confidence: 93%

Bioengineering Materials and Conditions for Obtaining Low Friction with PVA Hydrogels

Stoimenov¹,

Fridrici²,

Kapsa³

et al. 2013

Tribology Online

View full text Add to dashboard Cite

show abstract

“…As aforementioned, a large amount of studies regarding the free vibrational behaviors of beam-like microstructures can be found, but the excited vibration analyses of beam-like microstructures have not been investigated fully, and this is due to the lack of an excited vibration model containing intrinsic scale effects. Nevertheless, excited vibration is the main form of structural vibration in practical engineering [15]. With respect to a beam-like microstructure, it heavily depends on whether or not the intrinsic characteristic effects are taken into account, because the characteristic effects, such as the scale effect, cause changes in its lateral vibration.…”

Section: Introductionmentioning

confidence: 99%

A Perturbation Approach for Lateral Excited Vibrations of a Beam-like Viscoelastic Microstructure Using the Nonlocal Theory

Zhu

Sui

et al. 2021

Applied Sciences

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In this paper, we investigate the lateral vibration of fully clamped beam-like microstructures subjected to an external transverse harmonic excitation. Eringen’s nonlocal theory is applied, and the viscoelasticity of materials is considered. Hence, the small-scale effect and viscoelastic properties are adopted in the higher-order mathematical model. The classical stress and classical bending moments in mechanics of materials are unavailable when modeling a microstructure, and, accordingly, they are substituted for the corresponding effective nonlocal quantities proposed in the nonlocal stress theory. Owing to an axial elongation, the nonlinear partial differential equation that governs the lateral motion of beam-like viscoelastic microstructures is derived using a geometric, kinematical, and dynamic analysis. In the next step, the ordinary differential equations are obtained, and the time-dependent lateral displacement is determined via a perturbation method. The effects of external excitation amplitude on excited vibration are presented, and the relations between the nonlocal parameter, viscoelastic damping, detuning parameter, and the forced amplitude are discussed. Some dynamic phenomena in the excited vibration are revealed, and these have reference significance to the dynamic design and optimization of beam-like viscoelastic microstructures.

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Brake comfort – a review

Cantoni

Cesarini

Mastinu

et al. 2009

Vehicle System Dynamics

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Several state of the art papers and even books on brake vibration and/or noise have been presented in the literature. Many of them have analytically and sharply accounted for the impressive amount of research undertaken on this topic. This state of the art review focuses on the still-open questions that appear crucial from the perspective of a leading brake manufacturer. The paper deals with the phenomena of brake vibration and/or noise, the experimental and theoretical methods for studying such phenomena, and the actions that are identified to be necessary to definitely solve the addressed problem. Key topics are the modelling of friction, the modelling of the dynamics of the brake as a non-linear system subjected to deterministic or random (parametric) excitation, the proper modelling of the contact between the disc and the pad, and the experimental validation of the mathematical models.

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A Model of Adhesion Excited Micro-vibrations

Cited by 4 publications

References 14 publications

Bioengineering Materials and Conditions for Obtaining Low Friction with PVA Hydrogels

Bioengineering Materials and Conditions for Obtaining Low Friction with PVA Hydrogels

A Perturbation Approach for Lateral Excited Vibrations of a Beam-like Viscoelastic Microstructure Using the Nonlocal Theory

Brake comfort – a review

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