Abstract
The authors proposed a unique type of semiactive damper that utilizes electromagnetic induction of a fluid in previous paper. But it was not enough to act an effect of electromagnetic induction because of a weak magnetic flux density. In this paper Halbach magnetic arrays is used for the damper in order to improve the effect. The damper consists of a cylinder, a piston, a by-pass pipe, tubes, tube couplings, electrodes, and trapezoid rare-earth magnets. A high conductive polymer fluid is filled in the cylinder, the by-pass pipe and the tube. Two electrodes are fixed inside the by-pass pipe, and faced. Eight magnets are set up as an octagonal Halbach array around the by-pass pipe, and each array units are installed in series. The magnetic field of the by-pass pipe is analyzed by FEM, and measured. The maximum magnetic flux density inside the by-pass pipe is about 0.9 T, and larger than the previous type. Resisting force characteristics of the damper acting the Lorenz force are measured when a voltage of the electrodes is applied in cross at the magnetic flux. Finally the effect of the electromagnetic induction is confirmed experimentally.
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