Viscoplastic properties of an MR fluid in a damper

Skalski, P.; Zalewski, Robert

doi:10.15632/jtam-pl.52.4.1061

Cited by 6 publications

(8 citation statements)

References 15 publications

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“…The value of underpressure (defined as the difference between atmospheric and internal pressures) and a type of granular material are parameters strongly affecting the stiffness and damping properties of the structure [ 18 ]. Vacuum packed particles exhibit several similarities to MRFs or MREs and can be modeled with similar rheological models [ 19 , 20 ].…”

Section: Vacuum Packed Particlesmentioning

confidence: 99%

Innovative Controllable Torsional Damper Based on Vacuum Packed Particles

Rodak

Zalewski

2020

Materials

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In this paper a new concept of a controllable granular damper is presented. The introduced prototype works based on so-called vacuum packed particles (VPPs). Such structures are made of granular materials located in a soft and hermetic encapsulation. As a result of generating a partial vacuum inside the system, the structure starts to behave like a nonclassical solid body. The global physical (mechanical) features of VPPs depend on the level of internal underpressure. The introduced prototype of a controllable torsional damper exhibits various dissipative properties as a function of internal underpressure. The design details of the investigated device are presented. Basic laboratory tests results are discussed. To describe the hysteretic behavior of the device, the Bouc–Wen rheological model has been modified and adopted. Nonlinear functions of underpressure have been introduced to the initial model formulation. The developed Bouc–Wen model has been applied to capture the real response of the VPP torsional damper prototype.

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Section: Vacuum Packed Particlesmentioning

confidence: 99%

Innovative Controllable Torsional Damper Based on Vacuum Packed Particles

Rodak

Zalewski

2020

Materials

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“…The constitutive models, proposed in the literature, usually involve numerous parameters, necessary to describe precisely the behavior of the material. The experimental determination of these material constants can be very complicated for the entire range of possible applications, and often demands sophisticated and expensive conditions [10], [16]. Besides, many of them do not have a direct physical meaning.…”

Section: Numerical Simulation Of Vpp Behaviormentioning

confidence: 99%

Controlled Vacuum Packed Particles as a Part of Machine Interface System

Pyrz

2015

New Contributions in Information Systems and Technologies

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Abstract. New opportunities of the Vacuum Packed Particles (VPP) and its application as a part of human-machine interface system are investigated. VPP are conglomerates composed of grains encapsulated in a tight, flexible envelope and submitted to an internal underpressure. The underpressure value has a great impact on the behavior and properties of the medium. This property may be used in various novel applications. The experimental results related to the stiffness and the vibration analysis and the controllable mechanical properties of VPP are given. The possibilities of numerical simulation of VPP behavior in a function of internal pressure are shown. The potential and perspectives for novel applications of VPP as a part of human-machine interaction are pointed out.

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“…The main purpose of this device is to predict the velocity of the striking object and adjust appropriate characteristic to minimalize the value of load transferred to the object. Some papers have been published on the adaptive control of structure crash characteristic [7,8,9], but what distinguishes the structure proposed in this article is the material and the way of controlling it. The absorber is made of granular material closed in plastomer sleeve, which was in detail described in [10,11].…”

Section: Introductionmentioning

confidence: 99%

A concept of smart multiaxial impact damper made of vacuum packed particles

Bartkowski

Zalewski

2018

MATEC Web Conf.

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The conceptual design of smart crash energy absorber made of Vacuum Packed Particles (VPP) is presented in this work. This structure is composed of granular material inside a plastomer sleeve. The absorber can change the flexural stiffness and as a result the amount of dissipated energy depending on the impact conditions. The special properties of the granular structure create the possibility of various applications as different working modes can be used. When the pressure inside is equal or higher than atmospheric pressure the system behaves similarly to a liquid, otherwise it has properties similar to viscoplastic solid. The physical properties of the structure may be rapidly changed by adjusting the pressure inside the system. Due to these properties Vacuum Packed Particles is considered to be a smart material.

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Viscoplastic properties of an MR fluid in a damper

Cited by 6 publications

References 15 publications

Innovative Controllable Torsional Damper Based on Vacuum Packed Particles

Innovative Controllable Torsional Damper Based on Vacuum Packed Particles

Controlled Vacuum Packed Particles as a Part of Machine Interface System

A concept of smart multiaxial impact damper made of vacuum packed particles

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