Presentations

MR流体の圧力流れをに及ぼす磁場の影響を調べた。磁場印加部の圧力変動と音速変化の因果関係を検討した。

シリコンオイルと磁性流体の二層流体スロッシングの表面挙動と内部流速を実験的に調べ，印加磁場の影響を検討した。

磁性流体とMR流体における印加磁場かのクラスタ形成過程の変化に着目し，その違いを超音波伝播速度に基づいて検討を行った。

超音波ドップラー速度分布測定法(UVP)を用いて，磁性流体とケロシンの二層流体スロッシングの流動特性を調べた。

磁性流体を用いた同調液体ダンパーの特性を調べた。磁場を容器下部から印加した場合の性能評価を行った。

MR流体と磁性流体内の超音波伝播特性を実験的に検討を行った。

ケロシンと磁性流体の二層スロッシングの流動解析をを摂動法を用いて行った。さらに，超音波ドップラー法に基づいて内部の速度分布を測定し，液面・界面変化との関係を実験的に検討した。

磁性流体を用いたTLDの特性を実験的に明らかにした。

非磁性流体と磁性流体の二層スロッシングの内部流動挙動を実験的に調べた。非磁性流体としては，シリコンオイルを用いた。非線形解析も行い，界面の変動状態におよぼす印加磁場の影響を検討した。

磁性流体のダクト内流れに交流磁場を印加した場合の流れ場の挙動を実験的に調べた。

Tuned Liquid Column Damper (TLCD) is a kind of passive damping device which uses liquid column motion in a U-tube. We designed a new type of semi-active TLCD that uses a magnetic fluid as a working fluid. Two electromagnets were used and magnetic field was applied to both side of magnetic fluid column symmetrically. The frequency response of the structure with MF-TLCD was measured, and the influence of magnetic fields on the natural frequency of a magnetic fluid column was investigated.

Sloshing of a two-layer fluid with a water based magnetic fluid and a silicone oil was investigated. An experimental approach based on the measurement of pressure at several points by small disc-type pressure transducers and the real-time computation of a discrete Fourier transform was used. Changes in the sloshing behaviour of the two-layer fluid with several magnetic fields are reported.

The ultrasonic propagation velocity of MR fluid under various magnetic field sweep rates was measured. A magnetic flux density was applied from 0 to 400 mT over different lengths of time. On the basis of the experimental results, the effect of the magnetic field sweep rates on the cluster formation of MR fluid was analysed.

The characteristics of the inner structure of a magnetic fluid (MF) under high pressure were investigated experimentally. Experiments were conducted by using two different magnetic fields and various pressures. The ultrasonic propagation velocity changed with the application of magnetic fields and pressure. The change was related to cluster formation in the MF fluid. Based on the experimental results, the effect of pressure on the inner structure in MF was analyzed.

微小磁場が印加された場合，MR流体を用いた衝撃緩衝器の特性を，実験的に調べた。

緩衝器の作動流体として磁性体微粒子濃度が異なる2種類のMR流体を用い，その違いが緩衝器の抵抗力にどのような影響をおよぼすかを様々な実験条件の下で検討した。

Sloshing of a two-layer fluid with a water based magnetic fluid and a silicone oil was investigated. An objective of this investigation is to do basic study for control sloshing of a fluid (in this case, a silicone oil) using a magnetic fluid and a magnetic field. Several frequency response spectra are received in each experimental condition. Change of sloshing behaviour of a two-layer fluid by magnetic field is reported.

In this paper, we report experiment result of damping characteristic of different series of MR fluids when subjected to a shock loading. The MR fluids have different in the content of magnetic particle or volume fractions, which are 22% in MRF 122-EG and 32% in MRF 132-DG. From the experiment result, the effect of volume fraction of MR fluids on piston displacement, piston velocity and resistance force under shock loading can be analyzed.

We present the equation of motion of a MF-TLCD (Tuned Liquid Column Damper with a Magnetic Fluid), and solved it numerically using a 4th-order Runge-Kutta method. Using the numerical results, we demonstrate the frequency responses of a MF-TLCD and the effect of the magnetic field on the natural frequency of a MF-TLCD. We also compare numerical results with experimental results, and show that they are coincident qualitatively.

加圧下での磁性流体中の超音波伝播特性を調べた。それに基づき，加圧力，印加磁場強度が磁性体クラスタ成長におよぼす影響を検討した。