弁直下に置かれた配管内円柱構造物のランダム振動 : 第1報,現象の把握(機械力学,計測,自動制御)

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This paper describes the random vibration of a cylindrical structure in a pipe located just downstream of a valve. The cylindrical structure is a cantilevered circular pipe and the root stress, the acceleration of the pipe and the fluctuating velocity are measured with the flow velocity. As a result, it was found that the choice resonance occurred from the fact that only the natural frequency components of the vibration were dominant, the vibration due to the vortex shedding could not be observed in a strong turbulence flow and the second mode vibration is too small comparing with the first mode vibration to become the cause of failure. Moreover the fluctuating velocity could be normalized by the turbulent scale length, the velocity and the mean square of turbulence.
社団法人日本機械学会の論文
2002-08-25