A New Energy Recovery Device by Utilizing the Merchant Ship Rolling
Wave energy is a renewable clean and resources for ships. According to the rolling characteristics of merchant ships, this research designs an energy recovery device installed on the ship deck to harvest the energy generated by waves. And a typical 50,000 ton ship is selected as the experimental platform of the device. The mathematical model is established and solved by Newmark <inline formula> <tex math notation="LaTeX"\beta /tex math>/inline formula> method, and a simulation platform is built in MATLAB. By simulating the movement of the slider in the device, it shows that the slider can realize reciprocating motion when the ship rolls continuously. Then, the relevant parameters in different combinations of natural frequency <inline formula> <tex math notation="LaTeX"\omega _{n} /tex math>/inline formula> and damping ratio <inline formula> <tex math notation="LaTeX"\varepsilon /tex math>/inline formula> are calculated, the power output of the device and the motion law of the slider are analyzed, and parameters' variable curves are drawn in figures. A reasonable combination of <inline formula> <tex math notation="LaTeX"\omega _{n}=1.225$ /tex math>/inline formula> Hz, <inline formula> <tex math notation="LaTeX"\varepsilon =0.0612$ /tex math>/inline formula> and a relatively ideal average power (174.11 W) are found by comparing amounts of simulated results from typical sea conditions. It is indicated that four main factors affecting the power generation of the device include the elasticity coefficient <inline formula> <tex math notation="LaTeX"$K$ /tex math>/inline formula> effective damping coefficient <inline formula> <tex math notation="LaTeX"$C$ /tex math>/inline formula> in the device, the ship rolling period and rolling angle. Besides, the device can still output power continuously by simulation in complex sea condition. Based on the research, it is proved that the device mentioned in this study has good feasibility in generating electric energy during ship rolling, which can provide valuable ideas for the application of wave energy in ships on voyage.
IEEE Access