Digital-Control-Based Approximation of Optimal Wave Disturbances Attenuation for Nonlinear Offshore Platforms
The irregular wave disturbance attenuation problem for jacket-type offshore platforms involving the nonlinear characteristics is studied. The main contribution is that a digital-control-based approximation of optimal wave disturbances attenuation controller (AOWDAC) is proposed based on iteration co...
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| Format: | Article |
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MDPI AG
2017-12-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/10/12/1997 |
| _version_ | 1828150031091236864 |
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| author | Xiao-Fang Zhong Yu-Hong Sun Shi-Yuan Han Jin Zhou Dong Wang |
| author_facet | Xiao-Fang Zhong Yu-Hong Sun Shi-Yuan Han Jin Zhou Dong Wang |
| author_sort | Xiao-Fang Zhong |
| collection | DOAJ |
| description | The irregular wave disturbance attenuation problem for jacket-type offshore platforms involving the nonlinear characteristics is studied. The main contribution is that a digital-control-based approximation of optimal wave disturbances attenuation controller (AOWDAC) is proposed based on iteration control theory, which consists of a feedback item of offshore state, a feedforward item of wave force and a nonlinear compensated component with iterative sequences. More specifically, by discussing the discrete model of nonlinear offshore platform subject to wave forces generated from the Joint North Sea Wave Project (JONSWAP) wave spectrum and linearized wave theory, the original wave disturbances attenuation problem is formulated as the nonlinear two-point-boundary-value (TPBV) problem. By introducing two vector sequences of system states and nonlinear compensated item, the solution of introduced nonlinear TPBV problem is obtained. Then, a numerical algorithm is designed to realize the feasibility of AOWDAC based on the deviation of performance index between the adjacent iteration processes. Finally, applied the proposed AOWDAC to a jacket-type offshore platform in Bohai Bay, the vibration amplitudes of the displacement and the velocity, and the required energy consumption can be reduced significantly. |
| first_indexed | 2024-04-11T21:38:38Z |
| format | Article |
| id | doaj.art-76fa13861fab40929b0372f0533ffa3c |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T21:38:38Z |
| publishDate | 2017-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-76fa13861fab40929b0372f0533ffa3c2022-12-22T04:01:40ZengMDPI AGEnergies1996-10732017-12-011012199710.3390/en10121997en10121997Digital-Control-Based Approximation of Optimal Wave Disturbances Attenuation for Nonlinear Offshore PlatformsXiao-Fang Zhong0Yu-Hong Sun1Shi-Yuan Han2Jin Zhou3Dong Wang4School of Information Technology, Shandong Women’s University, Jinan 250300, ChinaSchool of Information Technology, Shandong Women’s University, Jinan 250300, ChinaShandong Provincial Key Laboratory of Network Based Intelligent Computing, University of Jinan, Jinan 250022, ChinaShandong Provincial Key Laboratory of Network Based Intelligent Computing, University of Jinan, Jinan 250022, ChinaShandong Provincial Key Laboratory of Network Based Intelligent Computing, University of Jinan, Jinan 250022, ChinaThe irregular wave disturbance attenuation problem for jacket-type offshore platforms involving the nonlinear characteristics is studied. The main contribution is that a digital-control-based approximation of optimal wave disturbances attenuation controller (AOWDAC) is proposed based on iteration control theory, which consists of a feedback item of offshore state, a feedforward item of wave force and a nonlinear compensated component with iterative sequences. More specifically, by discussing the discrete model of nonlinear offshore platform subject to wave forces generated from the Joint North Sea Wave Project (JONSWAP) wave spectrum and linearized wave theory, the original wave disturbances attenuation problem is formulated as the nonlinear two-point-boundary-value (TPBV) problem. By introducing two vector sequences of system states and nonlinear compensated item, the solution of introduced nonlinear TPBV problem is obtained. Then, a numerical algorithm is designed to realize the feasibility of AOWDAC based on the deviation of performance index between the adjacent iteration processes. Finally, applied the proposed AOWDAC to a jacket-type offshore platform in Bohai Bay, the vibration amplitudes of the displacement and the velocity, and the required energy consumption can be reduced significantly.https://www.mdpi.com/1996-1073/10/12/1997nonlinear offshore platformdigital controlnonlinear compensated componentdisturbance attenuationirregular wave force |
| spellingShingle | Xiao-Fang Zhong Yu-Hong Sun Shi-Yuan Han Jin Zhou Dong Wang Digital-Control-Based Approximation of Optimal Wave Disturbances Attenuation for Nonlinear Offshore Platforms Energies nonlinear offshore platform digital control nonlinear compensated component disturbance attenuation irregular wave force |
| title | Digital-Control-Based Approximation of Optimal Wave Disturbances Attenuation for Nonlinear Offshore Platforms |
| title_full | Digital-Control-Based Approximation of Optimal Wave Disturbances Attenuation for Nonlinear Offshore Platforms |
| title_fullStr | Digital-Control-Based Approximation of Optimal Wave Disturbances Attenuation for Nonlinear Offshore Platforms |
| title_full_unstemmed | Digital-Control-Based Approximation of Optimal Wave Disturbances Attenuation for Nonlinear Offshore Platforms |
| title_short | Digital-Control-Based Approximation of Optimal Wave Disturbances Attenuation for Nonlinear Offshore Platforms |
| title_sort | digital control based approximation of optimal wave disturbances attenuation for nonlinear offshore platforms |
| topic | nonlinear offshore platform digital control nonlinear compensated component disturbance attenuation irregular wave force |
| url | https://www.mdpi.com/1996-1073/10/12/1997 |
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