A directly driven floater type wave energy converter with nonlinear power-take-off mechanism in irregular waves

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (2) : 156-162.

XIAO Xiaolong1, XIAO Longfei1,2, LI Yang1

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Abstract

The energy-capturing performance of a directly driven floater type wave energy converter (WEC) with linear power-take-off (PTO) mechanism and nonlinear one was studied. Based on the linear potential theory, considering heaving oscillation of the WEC, the motion equations for the floater-PTO coupled system was established and numerically solved using the 4th order Runge-Kutta method. The influences of the stable equilibrium position of the PTO mechanism on energy-capturing were parametrically studied, the difference among power captures of WECs with linear/nonlinear PTO mechanisms was analyzed. The results showed that a WEC with nonlinear PTO mechanism can capture more energy in low-frequency range through selecting a proper stable equilibrium position than a WEC with linear PTO mechanism can, and have a wider bandwidth of the captured energy spectrum; so the former is more applicable for capturing wave energy in actual ocean.

Key words

wave energy converter (WEC) / floater / nonlinear power-take-off (PTO) mechanism / stable equilibrium position / power capture

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XIAO Xiaolong1, XIAO Longfei1,2, LI Yang1. A directly driven floater type wave energy converter with nonlinear power-take-off mechanism in irregular waves[J]. Journal of Vibration and Shock, 2018, 37(2): 156-162

References

[1] 訚耀保.海洋波浪能综合利用[M].上海:上海科学技术出版社，2013.227-228,231-232.
Yin Yaobao. Principle and device of the ocean wave energy conversion generation[M]. Shanghai: Shanghai scientific & technical publishers，2013. 227-228, 231-232.
[2] Mueller M A. Electrical generators for direct drive wave energy converters[J]. IEE Proceedings-generation, transmission and distribution, 2002, 149(4): 446-456.
[3] Eriksson M, Isberg J, Leijon M. Hydrodynamic modelling of a direct drive wave energy converter[J].International Journal of Engineering Science, 2005, 43(17): 1377-1387.
[4] Elwood D, Yim S C, Prudell J, et al. Design, construction, and ocean testing of a taut-moored dual-body wave energy converter with a linear generator power take-off[J]. Renewable Energy, 2010, 35(2): 348-354.
[5] Lejerskog E, Boström C, Hai L, et al. Experimental results on power absorption from a wave energy converter at the Lysekil wave energy research site[J]. Renewable Energy, 2015, 77: 9-14.
[6] Falnes J. Ocean waves and oscillating systems: linear interactions including wave-energy extraction[M]. London: Cambridge university press, 2002.45-46, 173.
[7] Mann B P, Owens B A. Investigations of a nonlinear energy harvester with a bistable potential well[J]. Journal of Sound and Vibration, 2010, 329(9): 1215-1226.
[8] Harne R L, Schoemaker M E, Dussault B E, et al. Wave heave energy conversion using modular multistability[J]. Applied Energy, 2014, 130: 148-156.
[9] Preumont A. Mechatronics: dynamics of electromechanical and piezoelectric systems[M]. Springer Science & Business Media, 2006.87-89.
[10] Scruggs J, Jacob P. Harvesting ocean wave energy[J]. Science, 2009, 323(5918): 1176-1178.
[11] 覃岭,吴必军.复杂圆柱型波能装置振动特性研究[J].振动与击,2010,29(4):188-192.
Qin Ling, Wu Bijun. Oscillating property of a complex cylinder as a wave energy conversion device. Journal of vibration and shock, 2010, 29(4): 188-192.
[12] Vicente P C, Falcão A F O, Justino P A P. Nonlinear dynamics of a tightly moored point-absorber wave energy converter[J]. Ocean Engineering, 2013, 59: 20-36.
[13] L. Tang, Y. Yang, C.K. Soh. Toward broadband vibration-based energy harvesting, J. Intell. Mater. Syst. Struct. 21(18) (2010) 1867-1897.
[14] 张显涛. 振荡浮体式波能发电装置的水动力研究[D].上海交通大学,2015, pp. 55-57.
X. Zhang, Hydrodynamic Performance Study of an Oscillating-body Wave Energy Converter, Dissertation, Shanghai Jiao Tong University, Shanghai, 2015, pp. 55-57.
[15] 肖龙飞,杨建民,范模,彭涛. 160kDWT FPSO在极浅水中运动安全性研究[J]. 船舶力学,2006,01:7-14.
Xiao L F, Yang J, Fan M, et al. Research on motions and safety performance of a 160kDWT FPSO in ultra-shallow water[J]. Chuanbo Lixue(Journal of Ship Mechanics), 2006, 10(1): 7-14.