Propulsion Performance Analysis of Wave-powered Boats

Zong-Yu Chang; Chao Deng; Jia-Kun Zhang; Zhan-Xia Feng; Zhong-Qiang Zheng

doi:10.46604/ijeti.2020.4276

Authors

Zong-Yu Chang College of Engineering, Ocean University of China, Qingdao, China ; Key Lab of Ocean Engineering of Shandong Province, Qingdao, China
Chao Deng College of Engineering, Ocean University of China, Qingdao, China
Jia-Kun Zhang College of Engineering, Ocean University of China, Qingdao, China
Zhan-Xia Feng College of Engineering, Ocean University of China, Qingdao, China
Zhong-Qiang Zheng College of Engineering, Ocean University of China, Qingdao, China ; Key Lab of Ocean Engineering of Shandong Province, Qingdao, China

DOI:

https://doi.org/10.46604/ijeti.2020.4276

Keywords:

wave-powered boat, dynamics analysis, ADAMS

Abstract

With the development of oceanographic research and marine environment protection, mobile marine platforms are applied for ocean observation for a long journey. Wave-powered boats are capable of applying wave motion to propel itself and make a long-duration survey. This paper presents the dynamics of the wave-powered boat under the excitation of the heave motion and pitch motion. Taking the wave-powered boat with double fins as an example, the heave and pitch motions of the boat are obtained by ANSYS-AQWA firstly. Then the relationship between propulsion performance and three factors, including wave height, wave period, and restoring stiffness of torsion spring, was analyzed through multibody dynamics software ADAMS. With the increase of sea state from level 1 to level 4 the average propulsion speed increased from 0.4m/s to 1.4m/s. Under the same wave height and period, with the increase of restoring stiffness of torsion spring from 0.0125N·m/deg to 0.3N·m /deg, the propulsion speed of the wave-powered boat increases first and then decreases, and there exists an optimum stiffness. Through the calculation it is found that when the restoring stiffness of torsional spring is increased from 0.025N·m /deg to 0.2N·m /deg with the sea state level 1 to 4, the wave powered boat has better propulsion performance.

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