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A New Structure of MR Brake with the Waveform Boundary of Rotary Disk
Tran Hai NAM,Kyoung Kwan AHN 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper presents a new structure of a Magneto Rheological (MR) brake which generates the resistance force based on the effect of material deformation process. A rotary disk is proposed and fabricated with the wave form boundary. Thus, the chains of an MR fluid are crushed together instead of being strained to break as known in the conventional design. The phenomenon of mechanical destruction creates a stronger resistance force than the conventional one.
New approach to designing an MR brake using a small steel roller and MR fluid
Tran Hai NAM,안경관 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.7
A generated resistance force in the deformation process is considered to increase the resistance torque of a Magneto-Rheological (MR) brake when a variable stiffness material is rolled under the cylindrical form of a roller. This paper proposes a new approach to increase the resistance torque of an MR brake using a large-size magnetic particle which can be considered as the roller mentioned above (steel roller or rolling pin). Due to the cylindrical form of the roller and a line contact between the roller and the surface of the motion part, the steel roller can contribute to create a stronger magnetic field and larger resistance force than the conventional one. In this paper, a new MR brake is successfully designed to generate a higher braking torque than the conventional one, which only uses typical MR fluid. To verify the effect of the roller, the proposed MR brake is compared with the conventional one. Both of the MR brakes are designed with the same magnetic circuit and the same material parameters. The performance of the proposed MR brake is compared with that of the conventional MR brake. The proposed MR brake is verified to have about 200% larger torque than the conventional one.
A new structure of a magnetorheological brake with the waveform boundary of a rotary disk
Nam, Tran Hai,Ahn, Kyoung Kwan Institute of Physics Publishing 2009 Smart materials & structures Vol.18 No.11
<P>This paper presents a novel magnetorheological (MR) brake design incorporating a rotary disk with a waveform boundary that generates a resistance force based on the effects of a material deformation process. This force is transmitted from an external agent and creates the necessary energy for breaking the structure of the hardened MR fluid. Its minimum destructive ability is proportional to the variable stiffness of an MR fluid in a magnetic field. In this design, the waveform wall of a rotary disk crushes the particles chains (fibrils) of the MR fluid together instead of breaking them via strain in a conventional MR brake. The resistance forces and braking torques generated by this crush action are stronger than those produced by strain action. To verify our proposed MR brake, the proposed and conventional MR brakes are designed using similar magnetic circuits and material parameters.</P><P> We compared the performance of our novel MR brake to the performance of a conventional MR brake, and demonstrated that the measured resistance torque of the proposed MR brake is approximately 600% greater than resistance torques generated by conventional brakes. </P>
PROPOSITION AND FABRICATION OF A NEW DESIGN OF MR BRAKE USING MR FLUID
남(Tran Hai NAM),안경관(Kyoung Kwan AHN),윤종일(Jong Il YOON) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Magneto-rheological (MR) fluid is a kind of functional fluid, whose rheological properties change with respect to the applied magnetic field. The MR fluid typically consists of silicon oil and micron-sized magnetic particles. MR fluids are now being developed and used in car shocks, damper for washing machine vibration reduction, prosthetic limbs (leg, hand in medicine), exercise equipment, and surface polishing of processing machine parts. In this paper, a new MR brake using large size magnetic particles mixed with normal MR fluid is proposed and fabricated to get higher magnetic permeability, and to increase magnetic flux in a qualitative manner. The operational mode of the proposed MR brake is completely different from the already known shear or valve mode. Finally, the braking force is compared between MR Brake with large size magnetic particles and MR Brake with only MR Fluid, and the braking force of the proposed MR Brake with large size magnetic particles is verified to be very effective by simulation.
Nam, Nguyen-Hai,Huong, Tran Lan,Dung, Do Thi Mai,Dung, Phan Thi Phuong,Oanh, Dao Thi Kim,Park, Sang Ho,Kim, Kyungrok,Han, Byung Woo,Yun, Jieun,Kang, Jong Soon,Kim, Youngsoo,Han, Sang-Bae Informa UK Ltd. 2014 Journal of enzyme inhibition and medicinal chemist Vol.29 No.5
<P>Since the first histone deacetylase (HDAC) inhibitor (Zolinza®, widely known as suberoylanilide hydroxamic acid; SAHA) was approved by the Food and Drug Administration for the treatment of T-cell lymphoma in 2006, the search for newer HDAC inhibitors has attracted a great deal of interest of medicinal chemists worldwide. As a continuity of our ongoing research in this area, we designed and synthesized a series of 5-substitutedphenyl-1,3,4-thiadiazole-based hydroxamic acids as analogues of SAHA and evaluated their biological activities. A number of compounds in this series, for example, <I>N<SUP>1</SUP></I>-hydroxy-<I>N</I><SUP>8</SUP>-(5-(2-chlorophenyl)-1,3,4-thiadiazol-2-yl)octandiamide (<B>5b</B>), <I>N<SUP>1</SUP></I>-hydroxy-<I>N</I><SUP>8</SUP>-(5-(3-chlorophenyl-1,3,4-thiadiazol-2-yl)octandiamide (<B>5c</B>) and <I>N<SUP>1</SUP></I>-hydroxy-<I>N</I><SUP>8</SUP>-(5-(4-chlorophenyl)-1,3,4-thiadiazol-2-yl)octandiamide (<B>5d</B>), were found to possess potent anticancer cytotoxicity and HDAC inhibition effects. Compounds <B>5b</B>-<B>d</B> were generally two- to five-fold more potent in terms of cytotoxicity compared to SAHA against five cancer cell lines tested. Docking studies revealed that these hydroxamic acid displayed higher affinities than SAHA toward HDAC8.</P>