Nonlinear dynamics of a fluid-conveying pipe under the combined action of cross-flow and top-end excitations |
| |
| Institution: | 1. Ocean College, Zhejiang University, Hangzhou, Zhejiang 310058, China;2. Department of Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China;3. Department of Ocean and Resources Engineering, University of Hawaii at Manoa, Honolulu, HI 96822, USA;1. School of Naval Architecture and Marine Engineering, National Technical University of Athens, Greece;2. School of Mathematics, University of East Anglia, Norwich, UK;1. Department of Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China;2. Hubei Key Laboratory for Engineering Structural Analysis and Safety Assessment, Wuhan 430074, China;1. Department of Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China;2. Hubei Key Laboratory for Engineering Structural Analysis and Safety Assessment, Wuhan 430074, China;3. Department of Engineering Science and Mechanics, MC 0219, Virginia Tech, Blacksburg, VA 24061, USA;1. Department of Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China;2. Hubei Key Laboratory for Engineering Structural Analysis and Safety Assessment, Wuhan 430074, China;3. Department of Mechanical and Aerospace Engineering, New Mexico State University, Las Cruces, NM 88003, USA;1. State Key Laboratory of Ocean Engineering, Collaborative Innovation Center for Advanced Ship and Deep-sea Exploration, Shanghai Jiao Tong University, 800 Dongchuan Road, Minhang District, Shanghai, 200240, China;2. Department of Marine Systems Engineering, Kyushu University, Fukuoka, Japan;3. International Institute for Carbon-Neutral Energy Research (WPI- I2CNER), Kyushu University, Fukuoka, Japan |
| |
| Abstract: | We report a theoretical investigation of an elastic and slender fluid-conveying pipe with a top-end excitation subjected to uniform cross flows. Considering the mean drag force and the time varying vortex-induced lift force which is modeled using a nonlinear van der Pol oscillator, the nonlinear partial differential equations of the motion of coupled fluid-structure system are constructed and simplified to a reduced-order model through the Galerkin-type discretization. By virtue of quasi-static displacement conditions, the characteristics of vortex-induced vibration of the pipe are evaluated for the first two lock-in modes. The results show that the top-end excitation can increase the vibration amplitude of the pipe when the cross-flow speed is out of the lock-in regions. When the cross-flow speed is within the lock-in region, however, the top-end oscillation causes a transition between quasi-periodic and periodic in the responses of the pipe, significantly reducing or increasing the vibration amplitudes depending on the excitation acceleration and frequency. This finding has an important guidance in suppressing vortex-induced vibrations by balancing the internal fluid velocity and the top-end excitation. |
| |
| Keywords: | Fluid-conveying pipes Vortex-induced vibrations Resonant frequency Lock-in Quasi-periodic response Top-end excitation |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
