Energy capture feature of wave energy converter with submerged parametric excitation pendulum

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (3) : 199-204.

WANG Tongtong1,2, XIAO Longfei1,2, YANG Lijun1,2

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Abstract

Here, the nonlinear mechanism of a parametrically excited pendulum was introduced and applied in wave energy converters.According to real wave’s excitation features of low frequency and small amplitude, a submerged simple pendulum wave energy converter was proposed to study its energy capture law in regular wave.Based on the potential flow theory, the nonlinear equation of motion for swing motion was built and solved numerically.Effects of pendulum ball mass ratio, excitation frequency and amplitude as well as system damping on energy capture efficiency were analyzed and compared with the energy capture efficiency of a simple pendulum in air.The results showed that appropriately choosing mass ratio can reduce natural frequency of a submerged parametrically excited pendulum; compared with a simple pendulum in air, energy capture frequency band width of a submerged parametrically excited pendulum is wider under wave excitation environment with low frequency and small amplitude, so its power generation power is higher.

Key words

wave energy converter / nonlinear mechanism / parametrically excited pendulum / energy capture power

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WANG Tongtong1,2, XIAO Longfei1,2, YANG Lijun1,2. Energy capture feature of wave energy converter with submerged parametric excitation pendulum[J]. Journal of Vibration and Shock, 2020, 39(3): 199-204

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