An investigation on the mitigation of end-stop impacts in a magnetorheological damper operated by the mixed mode

Yazid, Izyan Iryani Mohd; Mazlan, Saiful Amri; Imaduddin, Fitrian; Zamzuri, Hairi; Choi, Seung–Bok; Kikuchi, Takehito

doi:10.1088/0964-1726/25/12/125005

Cited by 12 publications

(9 citation statements)

References 19 publications

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“…This is due to their unique property that depicts fast real-time responses toward different intensities of magnetic fields [1]. Among these MR materials, MRF has established itself in applications especially related to the hydraulic devices in the automotive sector, such as torque and force transmitting devices [2], dampers [3,4], clutches [5], and brakes [6]. On the other hand, for the past few years, MRE has attracted an increasing interest as it is able to exhibit a desirable performance owing to the stability of magnetizable particles in a solid-based matrix [7].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Particle Alignment Using Silicone Oil Plasticizer and Its Effects on the Field-Dependent Properties of Magnetorheological Elastomers

Khairi

Fatah

Mazlan

et al. 2019

IJMS

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The existing mold concept of fabricating magnetorheological elastomer (MRE) tends to encounter several flux issues due to magnetic flux losses inside the chamber. Therefore, this paper presents a new approach for enhancing particle alignment through MRE fabrication as a means to provide better rheological properties. A closed-loop mold, which is essentially a fully guided magnetic field inside the chamber, was designed in order to strengthen the magnetic flux during the curing process with the help of silicone oil (SO) plasticizers. The oil serves the purpose of softening the matrix. Scanning electron microscopy (SEM) was used to observe the surface morphology of the fabricated MRE samples. The field-dependent dynamic properties of the MREs were measured several ways using a rheometer, namely, strain sweep, frequency sweep, and magnetic field sweep. The analysis implied that the effectiveness of the MRE was associated with the use of the SO, and the closed-loop mold helped enhance the absolute modulus up to 0.8 MPa. The relative magnetorheological (MR) effects exhibited high values up to 646%. The high modulus properties offered by the MRE with SO are believed to be potentially useful in industry applications, particularly as vibration absorbers, which require a high range of stiffness.

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Section: Introductionmentioning

confidence: 99%

Enhancement of Particle Alignment Using Silicone Oil Plasticizer and Its Effects on the Field-Dependent Properties of Magnetorheological Elastomers

Khairi

Fatah

Mazlan

et al. 2019

IJMS

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“…In contrast, the investigations on normal stress behavior of MRG are relatively infrequent. However, normal stress of MR material has a strong effect on the performance of some engineering devices, such as MR damper (Yazid et al, 2016) and MR finishing (Lambropoulos et al, 2010). Moreover, the normal stress behavior is also significant for understanding the mechanism of the MR effect and the evolution of particle microstructures.…”

Section: Introductionmentioning

confidence: 99%

Magneto-Induced Normal Stress of Magnetorheological Gel Under Quasi-Statically Monotonic and Periodically Cyclic Loading

Mao

Wang

et al. 2021

Front. Mater.

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Magnetorheological (MR) gel, an analog of MR fluid, is a novel kind of magnetic-responsive material. In this article, the influence of quasi-statically monotonic loading and periodically cyclic loading on the normal stress behavior of MR gel (MRG) is systemically investigated. Firstly, carbonyl iron powder (CIP) and soft polymer were adopted for the fabrication of MRG. Then, the variations of normal stress with shear strain were tested under different excited magnetic fields, shear rates, CIP contents, and shear strain amplitudes. It was found that the normal stress behavior of MRG exhibits three prominent stages: a sudden rise at the beginning, followed by a rapid decrease, and then a final steady-state value. The experiments also indicated that the excited magnetic field, compared with other influencing factors, has the most critical effect on the normal stress behavior of MRG. The corresponding mechanisms of various phenomena were methodically discussed. Furthermore, the ratio of shear stress to normal stress was proposed to better comprehend the mechanism of the evolution of internal microstructures of MRG and MR effects from a novel perspective. The results implied that the ratio has a close relation to the excited magnetic field and CIP content of MRG. The increase of normal stress is helpful for the fabrication of MRG with a high-efficiency MR effect.

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“…Furthermore, an alternative arrangement, squeeze mode, in which the fluid is subjected to compressive and tensile stresses, has been identified for small motion isolation [17,18]. In addition, it has been recently reported that the efficacy of MR fluid devices could be enhanced under a mixed-mode operation [19,20]. The comparative performance of MR fluid devices using theoretical and experimental procedures has been extensively reported in the technical literature [15,21,22].…”

Section: Introductionmentioning

confidence: 99%

A Novel Hydraulic Actuation System Utilizing Magnetorheological Fluids for Single-Port Laparoscopic Surgery Applications

Wahed

2020

Materials

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Single-port laparoscopic surgery (SLS), which utilizes one major incision, can deliver favorable cosmetic outcomes with fewer patient hospitalization stays and less postoperative pain. However, current SLS instruments, which are rigid and slender, have been suffering from several drawbacks, including their inability to provide the optimum articulation required to complete certain SLS tasks. This paper reports on the development of a lightweight smart hydraulic actuation system that is proposed to be embedded at selected joints along current SLS instruments, in order to enhance their adaptability with a higher level of stiffness and degrees-of-freedom. The developed smart actuation system utilizes both conventional hydraulic and magnetorheological (MR) fluid actuation technologies. Electromagnetic finite element analyses were conducted to design the electromagnetic circuit of the smart actuator. A prototype of the developed actuation system was manufactured, and its performance was assessed using a dedicated experimental arrangement, which was found to agree well with the results obtained using a Bingham plastic theoretical model. Finally, the present design of the developed smart actuation system permits an angulation of about 90° and a maximum force output in excess of 100 N, generated under a magnetic excitation of about 1.2 Tesla, which should be sufficient to resist torques of up to 500 mNm.

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An investigation on the mitigation of end-stop impacts in a magnetorheological damper operated by the mixed mode

Cited by 12 publications

References 19 publications

Enhancement of Particle Alignment Using Silicone Oil Plasticizer and Its Effects on the Field-Dependent Properties of Magnetorheological Elastomers

Enhancement of Particle Alignment Using Silicone Oil Plasticizer and Its Effects on the Field-Dependent Properties of Magnetorheological Elastomers

Magneto-Induced Normal Stress of Magnetorheological Gel Under Quasi-Statically Monotonic and Periodically Cyclic Loading

A Novel Hydraulic Actuation System Utilizing Magnetorheological Fluids for Single-Port Laparoscopic Surgery Applications

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