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2002 Fiscal Year Final Research Report Summary

Intelligent Vibration Control System with Actuators using MR Fluid

Research Project

Project/Area Number 12450096
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Dynamics/Control
Research InstitutionYokohama National University

Principal Investigator

MORISHITA Shin  Yokohama National University, Faculty of Environment and Information Sciences, Professor, 大学院・環境情報研究院, 教授 (80166404)

Co-Investigator(Kenkyū-buntansha) NAKANO Ken  Yokohama National University, Faculty of Environment and Information Sciences, Associate Professor, 大学院・環境情報研究院, 助教授 (30292642)
Project Period (FY) 2000 – 2002
KeywordsMR Fluid / Vibration Control System / Semi-active Mbration Control / Neural Network / Self-organization / Intelligent Control
Research Abstract

This project is on an intelligent vibration control system with actuators using MR fluid. MR fluid is known as a class of functional fluids whose rheological properties can be controlled by the applied magnetic field strength. By applying MR fluid to some conventional damper, semi-active dampers may be realized, and their damping properties can be controlled by an external applied signal. MR fluid is generally composed of ferromagnetic, micron-sized particles suspended in liquid such as mineral oil or silicone oil, and the particles are dispersed uniformly in the liquid by strong surface active agent without magnetic field. Under magnetic field, the particles aggregate and form chain-like cluster structures. When some shear deformation is applied to MR fluid, the clusters may scrub or brush the opposite surface and friction force may be produced, which show Bingham plastic behavior of the fluid. The friction force strongly depends on the strength of magnetic flux density, and it is very important to make closed loop magnetic circuit.
In the present project, the equivalent magnetic permiability of MR fluid was first estimated in order to predict MR effect of the semi-active actuators .The cluster formation under a magnetic field is simulated by Cellular Automata, which is known as a discrete modeling technique. Considerting the simulated particle structures, magnetic analysis was carried out by FEM code and equivalent permiability was estimated. Based on the results obtained above, a variable damper was constructed and set on a structural model. The MR damper was controlled by an intelligent control system composed of neural network. It was shown experimentally that an intelligent vibration control system was realized by the conbination of MR fluid and neural network control system.

  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] 白石俊彦, 森下信: "セルオートマトンを用いた分散粒子のクラスタ形成"日本機械学会,セルオートマトンシンポジウム講演論文集. 01-63. 250-254 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 白石俊彦, 中谷訓之, 森下信: "MRダンパを設置した構造物のニューラルネットワークによる制振"日本機械学会,機械力学,計測制御論文集. 643.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 中谷訓之, 白石俊彦, 森下信: "MRダンパによる構造物の制振"日本機械学会・ダンピングシンポジウム論文集. 110-114 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 白石俊彦, 中谷訓之, 森下信: "MRダンパによる模型構造物の振動制御"日本機械学会,関東支部総会講演論文集. 030-1. 295-296 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 白石俊彦, 清田剛史, 森下信: "分散粒子のクラスタ形成を考慮したMR流体の透磁率の算定"日本機械学会論文集(C). 69-680. 844-849 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shin Morishita, Toshihiko Shiraishi and Tomoya Sakuma: "On a Variable Damper Using MR Fluid"Proceedings of Motion and Vibraiton Control. 789-794 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Toshihiko Shiraishi, Noriyuki Nakaya and Shin Morishita: "Structural Control by a Variable Damper Using MR Fluid"Proceedings of Motion and Vibraiton Control. 24-29 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Toshihiko Shiraishi, Takashi Kiyota and Shin Morishita: "On the Equivalent Permiability in MR Fluid Considering Cluster Formation of Particles"Proceedings of 5th JSME-KSME Fluid Engineering Conference. No.02-207. OS8-2 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Toshihiko Shiraishi, Tomoya Sakuma and Shin Morishita: "Design and Performance Verification of Variable Damper Using MR Fluid"Proceedings of Mechanical Engineering Congress. to published. (2003)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2004-04-14  

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