A New Kind of Self-coupled Electrorheological Damper and its Vibration Character

Zhao, Xiao Peng; Liu, S.; Tang, Hong; Yin, Jian; Luo, Chun R.

doi:10.1177/1045389x05047211

Cited by 7 publications

(4 citation statements)

References 19 publications

(21 reference statements)

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“…Saturation of the polarization causes the local electric field to become independent of the applied electric field. According to the different range of the voltage the dependence of shear yield stress on electric field is different based on the scaling function analysis [26,48]. Although the shear yield stress of the ER fluids prepared with PS/PANI were not as high as those of other types of ER fluids, when particle volume fraction is higher the almost-linear relationship between yield stress and electric field is similar to the GER effect [9].…”

Section: Resultsmentioning

confidence: 99%

Shear thinning and shear thickening characteristics in electrorheological fluids

Jiang

Liu

Shan

et al. 2013

Smart Mater. Struct.

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The electrorheology (ER) of suspensions based on polystyrene/polyaniline (PS/PANI) core/shell structured microspheres and those based on disk-like zeolite particles at different electric fields and particle volume fractions have been studied, respectively. Both types of ER fluids showed abrupt shear thickening under high electric fields and low shear rates, as well as shear thinning when the shear rate increased. A normalized method that considers the effects of electric field strength, shear rate and particle volume fraction was proposed to compare the rheological curves of the two ER fluids. The curves evaluated from the normalization method showed similar shear thinning at low shear rates and the hydrodynamic effect at high shear rates. Shear thinning represents the structure destroyed by shearing, and shear thickening at low shear regions indicates the dramatic structure change. The particle volume fraction and structure factor effects demonstrate that the mechanical contact between particles and the wall of the electrodes is crucial to the shear strength of ER fluids, indicating an electric/magnetic field modulated friction mechanism of the ER and magnetorheological (MR) effects.

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Section: Resultsmentioning

confidence: 99%

Shear thinning and shear thickening characteristics in electrorheological fluids

Jiang

Liu

Shan

et al. 2013

Smart Mater. Struct.

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“…In article [30], Xiao P. Zhao et al presented a new kind of self-coupled electrorheological damper and its vibration characteristics. They presented a second-generation damper that has better vibration-damping properties than first-generation dampers.…”

Section: Fig 3 Vibration Sources In Audio Setsmentioning

confidence: 99%

Vibration damping of the anti-vibration platform intended for use in combination with audio/music devices

Breńkacz¹,

Bagiński²,

Korbicz³

2020

J. vibroeng.

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The article presents research on the damping properties of an anti-vibration platform (designed and manufactured by Stacore), which is intended for use in combination with high class audio devices. The platform comprises two parts that are capable of passive vibration damping. The design of this platform is unique and has been developed by applying several technical solutions in a combination not found on any other anti-vibration platform on the audio market. These solutions are described in the article. The first part of the platform is pneumatically operated and the second part uses ball bearings. The casing also fulfils the most important function – vibration damping. It is made of amorphous slate (known for its good vibration-damping properties) and includes a metal plate covered with a special visco-elastic layer that fulfils the role of binding material. The first part of the platform realises the pneumatic damping. It comprises four elastomer pneumatic springs, each with its own air tank. The air tanks are designed to operate at a maximum pressure of 5 bar. The second vibration-damping part of the platform is located above the first part (pneumatic) and consists of ball bearings, used for the isolation of transverse vibration, being relatively difficult to deal with pneumatic springs. The upper part consists of three bearings, each of which comprises of a polished, deep hardened steel racings and a ball made of tungsten carbide. The scientific literature describes many solutions enabling vibration damping, including many anti-vibration platforms. However, the literature lacks the descriptions of analyses conducted on anti-vibration platforms for audio devices. This article is a novelty in the literature as it concerns the experimental research aimed at verifying the vibration-damping capacity of the anti-vibration platform that can be used with audio devices owned by people who appreciate high-quality music. The article describes in detail the whole measurement procedure applied to the vibration damping platform. For research purposes, the anti-vibration platform was suspended on flexible ropes. At first, an electromagnetic vibration exciter was attached to the base on which the platform rested, and then the displacements of the upper and lower part of the platform were measured using laser sensors. Based on these signals, the vibration damping capability (transmissibility) of the platform was determined in two mutually perpendicular directions. In addition to the graph that shows the vibration damping capability of the anti-vibration platform, the signals of the applied force and displacements measured during the research are also presented in this article.

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“…Ketten bilden und sich dadurch die wirksame Viskosität der Flüssigkeit ändert, siehe beispielsweise [5; 17]. Da die Antwortzeiten bei Anbringen eines elektrischen Feldes im Bereich weniger Millisekunden liegen, stellt der ER Effekt eine ideale Basis für die Entwicklung neuer hochdynamischer aktiver und semi-aktiver Aktoren dar, siehe beispielsweise [3; 10; 13] und [27] für Dämpfer, [15; 24] für Schockdämpfer, [9; 23] für Kupplungen und Bremsen sowie [4; 6; 11] für Servoantriebe. Die hohe Dynamik des ER Effektes stellt auch einen der Hauptvorteile von ER Aktoren gegenüber konventionellen hydraulischen Aktoren dar, da die Dynamik hydraulischer Aktoren immer dadurch begrenzt wird, dass bei einem klassischen Ventil mechanische Teile bewegt werden müssen, um die Ölzu-bzw.…”

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Regelung adaptronischer Systeme, Teil II: Elektrorheologische Aktoren (Control of Adaptronic Systems, Part II: Electrorheological Actuators)

Kugi¹,

Kemmetmüller²

2006

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Der zweite Teil dieses Beitrages beschäftigt sich mit einem elektrorheologischen (ER) Aktor bestehend aus vier in einer Vollbrücke verschalteten ER Ringspaltventilen, in deren Diagonalzweig ein Gleichgangzylinder betrieben wird. Das Regelungsziel besteht darin, unter Ausnutzung des im Millisekundenbereich wirkenden ER Effektes eine möglichst schnelle Trajektorienfolgeregelung für die Kolbenposition zu entwerfen. In dieser Arbeit wird gezeigt, wie die im Vergleich zu konventionellen hydraulischen Aktoren zusätzliche Anzahl von Stelleingängen im Rahmen des Reglerentwurfes sinnvoll genutzt werden kann, um ein möglichst optimales Verhalten des geschlossenen Regelkreises unter den gegebenen Randbedingungen zu erzielen. Das Regelungskonzept basiert im Wesentlichen auf einem nichtlinearen kaskadierten flachheitsbasierten Druck-und Positionsregler in Kombination mit einer stabilisierenden Rückkopplung für den mittleren Versorgungsdruck. Simulationsergebnisse bestätigen recht eindrucksvoll das Potenzial der hier vorgestellten Regelungsstrategie.The second part of this contribution is concerned with an electrorheological (ER) actuator comprising a double-rod cylinder which is located in the cross path of a full-bridge consisting of four ER valves. The objective of the controller design is to track fast trajectories of the piston position by utilizing the rapid response time in the order of a few milliseconds of the ER effect. Compared to conventional hydraulic actuators this configuration provides more control inputs. In this work we will show, how we can exploit this additional number of control inputs within the controller design in order to optimize the performance of the closed-loop system by also considering the restrictions of the system. The control structure is composed of a cascaded flatness-based pressure and position controller in combination with a stabilizing feedback for the average supply pressure. Simulation results prove the excellent performance of the proposed control concept.

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A New Kind of Self-coupled Electrorheological Damper and its Vibration Character

Cited by 7 publications

References 19 publications

Shear thinning and shear thickening characteristics in electrorheological fluids

Shear thinning and shear thickening characteristics in electrorheological fluids

Vibration damping of the anti-vibration platform intended for use in combination with audio/music devices

Regelung adaptronischer Systeme, Teil II: Elektrorheologische Aktoren (Control of Adaptronic Systems, Part II: Electrorheological Actuators)

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