Effect of rotary inertia of concentrated masses on the natural frequencies of fluid conveying pipes = 집중 질량의 회전 관성 효과가 유체 수송 파이프의 고유 진동수에 미치는 영향

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The effect of concentrated masses on the natural frequency variation of the fluid conveying pipes for the two boundary conditions of the simply-supported pipe and clamped-clamped pipe is studied by computer simulation and by experiment. Rotary inertia effect of the concentrated masses is accordingly included in the governing equation. In the computer simulation work, Galerkin``s method is used for transformation of the governing equation to the eigenvalue problem and the natural frequencies are found in all possible regions-stable, unstable, and neutral stable. In the experiment, the natural frequencies are found in the neutral stable region for the variations of the fluid velocity, the concentrated mass, and its location. Water is used as working fluid and polymethyl-methacrylate pipe is used as the fluid conveying pipe. Introduction of an even slight mass of concentration brings large variation of the natural frequency. The rotary inertia effect also changes the natural frequency very much, so that its neglect results in large error. The results of both computer simulations and experiments show that they are in the good agreement in the extent of about 10 percent error bound when the rotary inertia effect is included for our analysis. The effect of the rotary inertia of concentrated mass can change not only the natural frequency but also its unstable velocity at higher modes.
Advisors
Lee, Byung-Ho이병호
Description
한국과학기술원 : 핵공학과,
Publisher
한국과학기술원
Issue Date
1988
Identifier
66504/325007 / 000861002
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 핵공학과, 1988.2, [ iii, 68 p. ]

URI
http://hdl.handle.net/10203/49172
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=66504&flag=dissertation
Appears in Collection
NE-Theses_Master(석사논문)
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