蛍光塗料を用いた多関節平板の振動変位計測

摘要

A multi-articulated flat plate oscillates itself in a mean flow, and it has steady oscillating mode. Laser light displacement sensor was necessary to acquire the displacements of an articulated flat plate because the articulated plate had large amplitude in its fluttering motion. The image processing by using a digital video camera was therefore used to clarify the fluttering motion of the articulated flat plate. In the experiment, motion capture technology was applied. Furthermore the fluorescent paint was used for the marker to capture the motion of the plates. From the results of image processing, it was found that the oscillating frequency is extremely periodic, and the amplitude is constant. Furthermore the oscillating frequency is proportional to the mean-flow velocity.%流体中に物体を配置した際，物体が振動することがある．この流体振動は，タコマ橋の崩落事故や高速増殖炉「もんじゆ」の冷却用液体ナトリウム漏洩事故に見られるように，機械構造物の破損・破壊を引き起こすため，これまでは抑制することに力が注がれてきた．しかし，機器の破損を引き起こすほどのエネルギを持つ振動を逆に利用できれば，まったく新しいエネルギ源が得られる．