Comparative study between dry friction and electrorheological fluid switches for Tuned Vibration Absorbers

Zusammenfassung Die Ergreifung von Maßnahmen zur Schwingungsreduktion ist eine im Maschinenbau wichtige Aufgabe, da unerwünschte Vibrationen zu Systemstörungen führen können. Insbesondere bei Leichtbausystemen wird die natürlich vorhandene interne Dämpfung des Systems reduziert und neue, innovative, energieeffiziente Dämpfungsalternativen sind erforderlich. Die vorliegende Arbeit beschäftigt sich mit zwei Systemen: der trockene Lock-Up Dämpfer und der vorgespannte trockene Reibungstilger. Diese Systeme basieren auf trockener Reibung und nutzen die Haft-Gleit-Eigenschaften aus, um Schwingungen im System zu reduzieren. Die Bewegungsgleichung dieser Systeme, sowie numerische Parameterstudien und analytische Lösungen via Mittelwertbildungsverfahren werden vorgestellt. Anschließend werden die Dämpfungsmechanismen in transienten Simulationen verglichen.

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“…Gln. (27) und (28) werden zunächst in Matrixform zusammengefasst und eine Modaltransformation wird angewendet…”

Section: Analytische Untersuchungenunclassified

Analyse von Tilgerkonfigurationen mit trockenen Reibungselementen

Aramendiz

Fidlin

2020

Forsch Ingenieurwes

Self Cite

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“…Smart rheological materials, such as electrorheological (ER) material and magnetorheological (MR) material, have been proved to have adjustable mechanical properties and significant value in vibration suppression applications [1][2][3]. than 10 ms.…”

Section: Introductionmentioning

confidence: 99%

Vibration control of giant electrorheological damper combining nonlinear fractional-order controller and extended state observer

Pu,

Liu,

Wang

et al. 2024

Smart Mater. Struct.

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As a typical smart material, giant electrorheological fluid (GERF) has a greater yield stress than electrorheological fluid (ERF) for vibration isolation. However, as rheological material, the modeling precision is severely degraded by its innate rate-dependent hysteretic nonlinearity and uncertainty. In this paper, a novel control method is proposed, which requires little information about the damper based on GERF. The proposed method combines nonlinear fractional-order control (FC) and extended state observer (ESO) by constructing damper as a second-order disturbance-based (SODB) structure to handle hysteretic nonlinearities, dynamic uncertainties and unknown disturbances. In contrast to the prevalent model-free control that neglects hysteresis nonlinearity, the proposed control algorithm considers it as a general disturbance and eliminates it. In addition, compared with linear FC with complex fractional-order ESO, where the order needs to be known in advance, nonlinear FC has improved robustness for uncertain fractional-order systems only via pure ESO. Simulations and experimental results demonstrate that the nonlinear controller outperforms the linear counterpart and the proposed method exhibits superior control performance compared to the existing model-free control, with an improvement of 26.9%.

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“…Electrorheological (ER) materials contain electro-responsive particles of micron or nanometer size that can be polarized and form electrostatic interactions with adjacent particles in an insulating medium [5,6]. Under the action of an external electric eld, their rheological characteristics undergo continuous and reversible changes, which make the ER materials attractive for use in vibration absorbers [7,8], breaks, and micro uidics [9,10].…”

Section: Introductionmentioning

confidence: 99%

Ionic liquid-modified TiO 2 nanoparticle-filled polyurethane as a new electro-responsive elastomer with controlled modulus and actuation strain by an electric field

Zhao,

Chen,

Zhang

et al. 2023

Preprint

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A new type of electro-responsive elastomer was prepared using polyurethane (PU) as the matrix and ionic liquid (IL)-modified TiO2 nanoparticles (TiO2-IL) as the active dispersed phase. The nanoparticles with different surface chemical structures (TiO2-IL: modified by IL only; TiO2-IL-AA: dual-modified by IL and acetic acid) were added in the second chain extension process and fixed by the solidified PU chains. The structures of the elastomers were analyzed by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and small-angle X-ray scattering (SAXS) to confirm the interaction between the nanoparticles and the soft and hard segments of PU. Rheological analysis was conducted under a controlled electric field, indicating that the PU-based elastomers showed electric field-improved modulus and the elastomer containing 20 wt% TiO2-IL nanoparticles exhibited the highest electrorheological (ER) efficiency of 247% at 3.0 kV/mm. Comparing the ER effects of the two types of nanoparticles, it was found that the TiO2-IL nanoparticles induced a stronger interfacial polarization effect and resulted in a higher ER effect than the TiO2-IL-AA nanoparticles. In addition, the PU-based elastomers containing TiO2-IL nanoparticles presented a significant electrostriction effect. The highest deformation in the thickness up to 14% occurs in the TiO2-IL-20wt% elastomer; however, the elastomers containing TiO2-IL-AA nanoparticles showed negligible actuation thickness strain, this might be related to the loose nature of TiO2-IL-AA nanoparticles. This research indicated that both electric filed-controlled modulus/rigidity and electric field-actuated deformation can be obtained in one system: the PU-based elastomer containing TiO2-IL nanoparticles, indicating its great potential in dual or multi-functional actuators.

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Comparative study between dry friction and electrorheological fluid switches for Tuned Vibration Absorbers

Cited by 15 publications

References 14 publications

Analyse von Tilgerkonfigurationen mit trockenen Reibungselementen

Analyse von Tilgerkonfigurationen mit trockenen Reibungselementen

Vibration control of giant electrorheological damper combining nonlinear fractional-order controller and extended state observer

Ionic liquid-modified TiO 2 nanoparticle-filled polyurethane as a new electro-responsive elastomer with controlled modulus and actuation strain by an electric field

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