Energy Efficiency Analysis of Multi-Type Floating Bodies for a Novel Heaving Point Absorber with Application to Low-Power Unmanned Ocean Device

Dongsheng Cong, Jianzhong Shang, Zirong Luo, Chongfei Sun and Wei Wu
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Dongsheng Cong: School of Intelligent Science, National University of Defense Technology, Changsha 410073, China
Jianzhong Shang: School of Intelligent Science, National University of Defense Technology, Changsha 410073, China
Zirong Luo: School of Intelligent Science, National University of Defense Technology, Changsha 410073, China
Chongfei Sun: School of Intelligent Science, National University of Defense Technology, Changsha 410073, China
Wei Wu: School of Intelligent Science, National University of Defense Technology, Changsha 410073, China

Energies, 2018, vol. 11, issue 12, 1-20

Abstract: 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.

Keywords: unmanned ocean device; wave energy; multi-type floating bodies; nonlinear Froude-Krylov force; energy efficiency (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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