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All Journal International Journal of Sustainable Transportation Technology
Ubaidillah, Ubaidillah
Mechanical Engineering Department, Faculty of Engineering, Universitas Sebelas Maret, Indonesia, National Center for Sustainable Transportation Technology, Indonesia
Automotive Engineering Control & Systems Engineering Engineering Industrial & Manufacturing Engineering Transportation

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An Innovative Design of Magnetorheological Lateral Damper for Secondary Suspension of a Train Masa'id, Aji; Ubaidillah, Ubaidillah; Lenggana, Bhre; Muhayat, Nurul; Wibowo, Wibowo; Mazlan, Saiful
http://dx.doi.org/10.31427/IJSTT.2019.2.2.2
Publisher : Unijourn Publisher

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Abstract

This article delivered an innovative idea of a magnetorheological (MR) damper for secondary suspension of train bogie. The valve inside MR damper adopted meandering of both fluid flow and magnetic flux for improving magnetization area. In this work, the design and working principle of the MR valve were presented including a mathematical model to predict the pressure drop. In the early stage, the finite element method magnetics software (FEMM) simulation could predict the magnetic flux density across the passages. Based on the amount of magnetic flux, the corresponding shear yield stress could be determined from its basic physical properties. The mathematical model covered pressure drop prediction for both off-state and on-state. The FEMM simulation results showed that the meandering flow and serpentine flux design could improve the effective area of magnetization. Consequently, the pressure drop of the valve could have wider ranges and achieve a high value of pressure differences. This result could be potentially improving the performance of the damping forces of the lateral damper in a bogie train.
Effect of Curing Current on Stiffness and Damping Properties of Magnetorheological Elastomers Hapipi, Norhiwani; Mazlan, Saiful; Aziz, Siti; Ubaidillah, Ubaidillah; Mohamad, Norzilawati; Yazid, Izyan; Choi, Seung-Bok
http://dx.doi.org/10.31427/IJSTT.2018.1.2.3
Publisher : Unijourn Publisher

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In this study, the viscoelastic effects of the magnetic field strength imposed for curing process on the stiffness and damping properties of magnetorheological elastomers (MREs) are experimentally investigated. In order to observe the effect, three different samples of MRE are fabricated by imposing curing current of 0.1 A, 0.3 A and 0.5 A which is equivalent to the magnetic field of 70 mT, 309 mT, and 345 mT, respectively. All samples consist of 30% silicone rubber and 70% carbonyl iron particles (CIPs) by weight percentages. After observing the morphological images via SEM, the dynamic performances of these samples, such as storage modulus and loss factor are evaluated and compared as a function of the magnetic field intensity or oscillation frequency. It is shown that the sample cured at 0.5A exhibits the highest storage modulus in the frequency domain. In addition, MR effects of three samples are identified, and it is found that the sample cured at 0.5A shows the highest absolute and relative MR effect.
Co-Authors Aziz, Siti Choi, Seung-Bok Hapipi, Norhiwani Lenggana, Bhre Masa'id, Aji Mazlan, Saiful Mazlan, Saiful Mohamad, Norzilawati Muhayat, Nurul Wibowo, Wibowo Yazid, Izyan