Enhancement of force-transfer devices with magnetorheological fluid using real-time microscopic observation

2014 Fiscal Year Final Research Report

• Project/Area Number: 26630020
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Production engineering/Processing studies
• Research Institution: The University of Tokyo
• Principal Investigator: NAGATO Keisuke 東京大学, 工学(系)研究科(研究院), 講師 (50546231)
• Co-Investigator(Kenkyū-buntansha): MATSUSHIMA Takashi 筑波大学, システム情報系, 准教授 (60251625)
• Project Period (FY): 2014-04-01 – 2015-03-31
• Keywords: 磁性 / 自己組織化 / 機械要素 / 機械工作・生産工学 / 流体工学

Outline of Final Research Achievements

The torque-transfer devices using magnetorheological fluid are required their miniaturization and higher torque transfer. The purpose of this study is clarification of phenomena such as forming, deforming, and slipping of the clusters by using real-time observation and simultaneous torque measurement and a distinct element method, in order to support the design of enhanced shear stress of the devices.
We designed and assembled a system, in which the two magnetic-pole disks are rotated and vertically applied magnetic field. In the clearance of the poles, magnetic particles form cluster, deformed among them, and slipped on the pole surface. The high-speed microscope observes the particles from the side of the poles, simultaneously, the torque between the poles is also measured. Furthermore, concavo-convexes on the pole surface enhanced maximum torque 2.5 times from the flat surface. This is because the magnetic fields were concentrated at the concaves, which was confirmed by simulation.

Free Research Field

ナノ成形加工学、ナノ材料加工学