| LQR control on multimode vortex-induced vibration of flexible riser undergoing shear flow | |
Song JX(宋吉祥)1,2 ; Chen WM(陈伟民)1,2; Guo SX(郭双喜)1,2; Yan DB(严定帮)1,2
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| Corresponding Author | Chen, Weimin([email protected]) |
| Source Publication | MARINE STRUCTURES
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| 2021-09-01 | |
| Volume | 79Pages:21 |
| ISSN | 0951-8339 |
| Abstract | Under the actions of ocean currents and/or waves, deep-sea flexible risers are often subject to vortex-induced vibration (VIV). The VIV can lead to severe fatigue and structural safety issues caused by oscillatory periodic stress and large-amplitude displacement. As flexible risers have natural modes with lower frequency and higher density, a multimode VIV is likely to occur in risers under the action of ocean currents, which is considered as shear flow. To decrease the response level of the VIV of the riser actively, a multimode control approach that uses a bending moment at the top end of the riser via an LQR optimal controller is developed in this study. The dynamic equations of a flexible riser including the control bending moment in shear flow are established both in the time and state-space domains. The LQR controllers are then designed to optimize the objective function, which indicates the minimum cost of the riser's VIV response and control input energy based on the Riccati equation of the closed-loop system under the assumption that the lift coefficient distribution is constant. Finally, the VIV responses of both the original and closed-loop systems under different flow velocities are examined through numerical simulations. The results demonstrate that the designed active control approaches can effectively reduce the riser displacement/angle by approximately 71%-89% compared with that of the original system. Further, for multimode control, the presented mode-weighted control is more effective than the mode-averaged control; the decrease in displacement is approximately 1.13 times than that of the mode-averaged control. Owing to the increase in flow velocity as more and higher-order modes are excited, the VIV response of the original system decreases slightly while the frequency response gradually increases. For the closed-loop system, the response becomes smaller and more complicated, and the efficiency of the controller becomes lower at a certain flow velocity. |
| Keyword | Flexible riser Vortex-induced vibration Active control LQR method |
| DOI | 10.1016/j.marstruc.2021.103047 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000684545600003 |
| WOS Keyword | ACTIVE CONTROL ; BOUNDARY CONTROL ; MARINE RISERS ; HELICAL STRAKES ; VIV |
| WOS Research Area | Engineering |
| WOS Subject | Engineering, Marine ; Engineering, Civil |
| Funding Project | Strategic Priority Research Program of the Chinese Academy of Sciences[XDA22000000] |
| Funding Organization | Strategic Priority Research Program of the Chinese Academy of Sciences |
| Classification | 一类 |
| Ranking | 1 |
| Contributor | Chen, Weimin |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/87234 |
| Collection | 流固耦合系统力学重点实验室 |
| Affiliation | 1.Chinese Acad Sci, Inst Mech, Key Lab Mech Fluid Solid Coupling Syst, Beijing 100190, Peoples R China; 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China |
| Recommended Citation GB/T 7714 | Song JX,Chen WM,Guo SX,et al. LQR control on multimode vortex-induced vibration of flexible riser undergoing shear flow[J]. MARINE STRUCTURES,2021,79:21.Rp_Au:Chen, Weimin |
| APA | 宋吉祥,陈伟民,郭双喜,&严定帮.(2021).LQR control on multimode vortex-induced vibration of flexible riser undergoing shear flow.MARINE STRUCTURES,79,21. |
| MLA | 宋吉祥,et al."LQR control on multimode vortex-induced vibration of flexible riser undergoing shear flow".MARINE STRUCTURES 79(2021):21. |
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| Jp2021F366.pdf（2459KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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