시뮬레이션에 의한 유체 유동 파이프 계의 곡관부의 각도 변화에 따른 고유진동수 고찰

• 영문명: A Simulation for the Natural Frequencies of Curved Pipes Containing Fluid Flow with Various Elbow Angles
• 발행기관: 한국시뮬레이션학회
• 저자명: 최명진(Myung-Jin Choi) 장승호(Seung-Ho Jang)
• 간행물 정보: 『한국시뮬레이션학회 논문지』제10권 제1호, 63~72쪽, 전체 10쪽
• 주제분류: 공학 > 기타공학
• 파일형태: PDF
• 발행일자: 2001.03.30

영문 초록

To investigate the natural frequencies of curved piping systems with various elbow angles conveying flow fluid, a simulation is performed considering initial tension due to the inside fluid. The system is analyzed by finite element method utilizing straight beam element. Elbow part is meshed using 4 elements, and the initial tension is considered by inserting equivalent terms into the stiffness matrix. Without considering the initial tension, the system becomes unstable, that is, the fundamental natural frequency approaches to zero value fast, as the flow velocity reaches critical value. With the initial tension terms, the system becomes stable where there is no abrupt decrease of the fundamental natural frequency. The change rate of the natural frequency with respect to the flow velocity reduces. As elbow angle increases, the system becomes stiffer, then around 150 degrees of the elbow angle the natural frequency has the largest value, the value decreases after the angle of the gest natural frequency. When angle is between 170 degrees and 179 degrees, the natural frequency is very sensitive. This means that small change of angle results in great change of natural frequency, which is expected to be utilized in the control of the natural frequency of the piping system conveying flow fluid.

목차

1. 서론

2. 본론

3. 시뮬레이션 결과

4. 결론

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