Design of the Depth Controller for a Floating Ocean Seismograph
Floating ocean seismograph (FOS) is a vertical underwater vehicle used to detect ocean earthquakes by observing <i>P</i> waves at teleseismic distances in the oceans. With the requirements of rising to the surface and transmitting data to the satellite in real time and diving to the desi...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-03-01
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| Series: | Journal of Marine Science and Engineering |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2077-1312/8/3/166 |
| _version_ | 1818455685932777472 |
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| author | Haocai Huang Chenyun Zhang Weiwei Ding Xinke Zhu Guiqing Sun Hangzhou Wang |
| author_facet | Haocai Huang Chenyun Zhang Weiwei Ding Xinke Zhu Guiqing Sun Hangzhou Wang |
| author_sort | Haocai Huang |
| collection | DOAJ |
| description | Floating ocean seismograph (FOS) is a vertical underwater vehicle used to detect ocean earthquakes by observing <i>P</i> waves at teleseismic distances in the oceans. With the requirements of rising to the surface and transmitting data to the satellite in real time and diving to the desired depth and recording signals, the depth control of FOS needs to be zero overshoot and accurate with fast response. So far, it remains challenging to implement such depth control due to the variation of buoyancy caused by the seawater density varying with the depth. The deeper the water is, the greater the impacts on buoyancy are. To tackle it, a fuzzy sliding mode controller considering the influence of seawater density change is proposed and simulated in MATLAB/SIMULINK based on the variable buoyancy system and state space function of FOS. Compared with proportional-integral-derivative (PID) controller, fuzzy PID controller and sliding mode controller, the simulation results indicate that the proposed controller shows its superiority regardless of the disturbing force. Its advantages include smaller steady-state error, faster response time, smaller system chatter, and well robustness. This proves that the designed fuzzy sliding mode controller is able to meet the working requirements and thus, lays a foundation for FOS application. |
| first_indexed | 2024-12-14T22:14:43Z |
| format | Article |
| id | doaj.art-18ab96d86fe74935b2f82b28ed564bb5 |
| institution | Directory Open Access Journal |
| issn | 2077-1312 |
| language | English |
| last_indexed | 2024-12-14T22:14:43Z |
| publishDate | 2020-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Marine Science and Engineering |
| spelling | doaj.art-18ab96d86fe74935b2f82b28ed564bb52022-12-21T22:45:40ZengMDPI AGJournal of Marine Science and Engineering2077-13122020-03-018316610.3390/jmse8030166jmse8030166Design of the Depth Controller for a Floating Ocean SeismographHaocai Huang0Chenyun Zhang1Weiwei Ding2Xinke Zhu3Guiqing Sun4Hangzhou Wang5Ocean College, Zhejiang University, Zhoushan 316021, ChinaOcean College, Zhejiang University, Zhoushan 316021, ChinaThe Second Institute of Oceanography, Ministry of Natural Resources of the People’s Republic of China, Hangzhou 310012, ChinaThe Second Institute of Oceanography, Ministry of Natural Resources of the People’s Republic of China, Hangzhou 310012, ChinaOcean College, Zhejiang University, Zhoushan 316021, ChinaOcean College, Zhejiang University, Zhoushan 316021, ChinaFloating ocean seismograph (FOS) is a vertical underwater vehicle used to detect ocean earthquakes by observing <i>P</i> waves at teleseismic distances in the oceans. With the requirements of rising to the surface and transmitting data to the satellite in real time and diving to the desired depth and recording signals, the depth control of FOS needs to be zero overshoot and accurate with fast response. So far, it remains challenging to implement such depth control due to the variation of buoyancy caused by the seawater density varying with the depth. The deeper the water is, the greater the impacts on buoyancy are. To tackle it, a fuzzy sliding mode controller considering the influence of seawater density change is proposed and simulated in MATLAB/SIMULINK based on the variable buoyancy system and state space function of FOS. Compared with proportional-integral-derivative (PID) controller, fuzzy PID controller and sliding mode controller, the simulation results indicate that the proposed controller shows its superiority regardless of the disturbing force. Its advantages include smaller steady-state error, faster response time, smaller system chatter, and well robustness. This proves that the designed fuzzy sliding mode controller is able to meet the working requirements and thus, lays a foundation for FOS application.https://www.mdpi.com/2077-1312/8/3/166floating ocean seismographvariable buoyancy systemdepth controlfuzzy proportional-integral-derivative (pid) controlfuzzy sliding mode control |
| spellingShingle | Haocai Huang Chenyun Zhang Weiwei Ding Xinke Zhu Guiqing Sun Hangzhou Wang Design of the Depth Controller for a Floating Ocean Seismograph Journal of Marine Science and Engineering floating ocean seismograph variable buoyancy system depth control fuzzy proportional-integral-derivative (pid) control fuzzy sliding mode control |
| title | Design of the Depth Controller for a Floating Ocean Seismograph |
| title_full | Design of the Depth Controller for a Floating Ocean Seismograph |
| title_fullStr | Design of the Depth Controller for a Floating Ocean Seismograph |
| title_full_unstemmed | Design of the Depth Controller for a Floating Ocean Seismograph |
| title_short | Design of the Depth Controller for a Floating Ocean Seismograph |
| title_sort | design of the depth controller for a floating ocean seismograph |
| topic | floating ocean seismograph variable buoyancy system depth control fuzzy proportional-integral-derivative (pid) control fuzzy sliding mode control |
| url | https://www.mdpi.com/2077-1312/8/3/166 |
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