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Journal of the Korea Institute of Military Science and Technology 2005;8(1):81-91.
Frequency Response Analysis of Pipe Conveying Harmonically Excited Fluid
Jun-Seok Oh
Agency for Defense Development
내부 유체의 조화 가진에 의한 배관의 주파수응답해석
오준석
국방과학연구소
Abstract
It is well known that the natural frequencies of the pipe come to be lower as internal fluid velocity and pressure increase, and the pipe will be unstable if the fluid velocity is higher than critical velocity. But even if the velocity of the fluid below the critical velocity, resonance will be caused by pulsation of the fluid. So the effects of pulsating fluid in pipe should be also taken into consideration for better analysis. The research of the vibration of piping system due to a fluid pulsation has been studied by many people. But most of them are dealt with determining the boundary between stable and unstable region without analyzing forced response in the stable region. In this study, not only stability analysis but also forced response analysis, which is caused by harmonically excited fluid especially, is conducted. In order to analyze the system numerically, the descretized equation is formulated by using FEM(Finite Element Method). And the results of this method are compared with those of AMM(Assumed Mode Method) which were used by many researcher earlier.
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