狭窄下流弾性管壁の振動計測

概要

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It is well known that vibration is induced on elastic tube wall downstream of stenosis, but the mechanism of this vibration is not understood completely. In this research, displacement of wall vibration was measured to obtain knowledge about this vibration. Two gap sensors were installed at same longitudinal position to measure the displacements of opposite side. Differentiating and adding these displacements, components of flexural and wall bending vibration were separated. By this mensurasion, peaks observed in the frequency spectrum were deduced to be each vibration. The wall bending vibration was studied into detail, and the following conclusion was derived. Forming natural mode of wave length 2, the vibration is locally induced on elastic tube wall downstream of stenosis. The peak frequency depends on both character and transmural pressure of the tube, but not on Reynolds number, severity and geometry of stenosis. So the tube character of cylindrical shell is essential to the vibration on elastic tube wall downstream of stenosis.
社団法人日本機械学会の論文
1996-08-25