Energy Efficiency Analysis of Multi-Type Floating Bodies for a Novel Heaving Point Absorber with Application to Low-Power Unmanned Ocean Device
Long-term energy supplies hinder the application of the low-power unmanned ocean devices to the deep sea. Ocean wave energy is a renewable resource with amount stores of enormous and high density. The wave energy converter (WEC) could be miniaturized so that it can be integrated into the devices to...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2018-11-01
|
| Series: | Energies |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1073/11/12/3282 |
| _version_ | 1798026664749301760 |
|---|---|
| author | Dongsheng Cong Jianzhong Shang Zirong Luo Chongfei Sun Wei Wu |
| author_facet | Dongsheng Cong Jianzhong Shang Zirong Luo Chongfei Sun Wei Wu |
| author_sort | Dongsheng Cong |
| collection | DOAJ |
| description | Long-term energy supplies hinder the application of the low-power unmanned ocean devices to the deep sea. Ocean wave energy is a renewable resource with amount stores of enormous and high density. The wave energy converter (WEC) could be miniaturized so that it can be integrated into the devices to make up the power module. In this paper, a small novel heaving point absorber of energy supply for low-power unmanned ocean devices is developed based on the counter-rotating self-adaptive mechanism. The floating body as an important part of the heaving point absorber, the geometric parameters is optimized to increase the efficiency of power production. Through constructing the constitutive relation between the geometric parameters, the wave force, the motion displacement, the motion velocity, and the capture width ratio of the floating body, the energy efficiency characteristics of the multi-type floating bodies are calculated, and the optimal shape is selected. On the other hand, in the calculation process of the wave force, the Froude-Krylov method is an effective method to accurately calculate the wave excitation force. Meanwhile, nonlinear static and dynamic Froude-Krylov force effectively overcomes the inaccuracy of the linear models and reduces the time consumed to simulate. Finally, the wave force, heaving velocity, heaving displacement, and capture width ratio of the three floating bodies are compared and analyzed, and the results show that the cylindrical floater that is vertically placed on the wave surface is more suitable for the novel heaving wave energy point absorber. |
| first_indexed | 2024-04-11T18:38:45Z |
| format | Article |
| id | doaj.art-9def4f417fb04f18b684e7bb27b2af1e |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T18:38:45Z |
| publishDate | 2018-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-9def4f417fb04f18b684e7bb27b2af1e2022-12-22T04:09:04ZengMDPI AGEnergies1996-10732018-11-011112328210.3390/en11123282en11123282Energy Efficiency Analysis of Multi-Type Floating Bodies for a Novel Heaving Point Absorber with Application to Low-Power Unmanned Ocean DeviceDongsheng Cong0Jianzhong Shang1Zirong Luo2Chongfei Sun3Wei Wu4School of Intelligent Science, National University of Defense Technology, Changsha 410073, ChinaSchool of Intelligent Science, National University of Defense Technology, Changsha 410073, ChinaSchool of Intelligent Science, National University of Defense Technology, Changsha 410073, ChinaSchool of Intelligent Science, National University of Defense Technology, Changsha 410073, ChinaSchool of Intelligent Science, National University of Defense Technology, Changsha 410073, ChinaLong-term energy supplies hinder the application of the low-power unmanned ocean devices to the deep sea. Ocean wave energy is a renewable resource with amount stores of enormous and high density. The wave energy converter (WEC) could be miniaturized so that it can be integrated into the devices to make up the power module. In this paper, a small novel heaving point absorber of energy supply for low-power unmanned ocean devices is developed based on the counter-rotating self-adaptive mechanism. The floating body as an important part of the heaving point absorber, the geometric parameters is optimized to increase the efficiency of power production. Through constructing the constitutive relation between the geometric parameters, the wave force, the motion displacement, the motion velocity, and the capture width ratio of the floating body, the energy efficiency characteristics of the multi-type floating bodies are calculated, and the optimal shape is selected. On the other hand, in the calculation process of the wave force, the Froude-Krylov method is an effective method to accurately calculate the wave excitation force. Meanwhile, nonlinear static and dynamic Froude-Krylov force effectively overcomes the inaccuracy of the linear models and reduces the time consumed to simulate. Finally, the wave force, heaving velocity, heaving displacement, and capture width ratio of the three floating bodies are compared and analyzed, and the results show that the cylindrical floater that is vertically placed on the wave surface is more suitable for the novel heaving wave energy point absorber.https://www.mdpi.com/1996-1073/11/12/3282unmanned ocean devicewave energymulti-type floating bodiesnonlinear Froude-Krylov forceenergy efficiency |
| spellingShingle | Dongsheng Cong Jianzhong Shang Zirong Luo Chongfei Sun Wei Wu Energy Efficiency Analysis of Multi-Type Floating Bodies for a Novel Heaving Point Absorber with Application to Low-Power Unmanned Ocean Device Energies unmanned ocean device wave energy multi-type floating bodies nonlinear Froude-Krylov force energy efficiency |
| title | Energy Efficiency Analysis of Multi-Type Floating Bodies for a Novel Heaving Point Absorber with Application to Low-Power Unmanned Ocean Device |
| title_full | Energy Efficiency Analysis of Multi-Type Floating Bodies for a Novel Heaving Point Absorber with Application to Low-Power Unmanned Ocean Device |
| title_fullStr | Energy Efficiency Analysis of Multi-Type Floating Bodies for a Novel Heaving Point Absorber with Application to Low-Power Unmanned Ocean Device |
| title_full_unstemmed | Energy Efficiency Analysis of Multi-Type Floating Bodies for a Novel Heaving Point Absorber with Application to Low-Power Unmanned Ocean Device |
| title_short | Energy Efficiency Analysis of Multi-Type Floating Bodies for a Novel Heaving Point Absorber with Application to Low-Power Unmanned Ocean Device |
| title_sort | energy efficiency analysis of multi type floating bodies for a novel heaving point absorber with application to low power unmanned ocean device |
| topic | unmanned ocean device wave energy multi-type floating bodies nonlinear Froude-Krylov force energy efficiency |
| url | https://www.mdpi.com/1996-1073/11/12/3282 |
| work_keys_str_mv | AT dongshengcong energyefficiencyanalysisofmultitypefloatingbodiesforanovelheavingpointabsorberwithapplicationtolowpowerunmannedoceandevice AT jianzhongshang energyefficiencyanalysisofmultitypefloatingbodiesforanovelheavingpointabsorberwithapplicationtolowpowerunmannedoceandevice AT zirongluo energyefficiencyanalysisofmultitypefloatingbodiesforanovelheavingpointabsorberwithapplicationtolowpowerunmannedoceandevice AT chongfeisun energyefficiencyanalysisofmultitypefloatingbodiesforanovelheavingpointabsorberwithapplicationtolowpowerunmannedoceandevice AT weiwu energyefficiencyanalysisofmultitypefloatingbodiesforanovelheavingpointabsorberwithapplicationtolowpowerunmannedoceandevice |