Recent advances in wave energy converters based on nonlinear stiffness mechanisms

Abstract

Wave energy is one of the most abundant renewable clean energy sources, and has been widely studied because of its advantages of continuity and low seasonal variation. However, its low capture efficiency and narrow capture frequency bandwidth are still technical bottlenecks that restrict the commercial application of wave energy converters (WECs). In recent years, using a nonlinear stiffness mechanism (NSM) for passive control has provided a new way to solve these technical bottlenecks. This literature review focuses on the research performed on the use of nonlinear mechanisms in wave energy device utilization, including the conceptual design of a mechanism, hydrodynamic models, dynamic characteristics, response mechanisms, and some examples of experimental verification. Finally, future research directions are discussed and recommended.

Resonant periodic structures for strong attenuation of surface water wave

“…, 1 ½ T represents the force provided by the NSM, which is determined by its specific configuration. 21…”

Dual‐Float‐Based Triboelectric Nanogenerator for Low‐Frequency Wave Energy Harvesting

“…[ 5 ] Generally, the conversion of wave energy can be divided into three stages, including primary, secondary, and tertiary energy conversion stages. [ 6 ] In the primary energy conversion stage, single‐float wave energy generators rely on the interaction between the waves and the float structure to convert wave energy into mechanical energy of the float, so the system can only achieve a better capture efficiency when the float “resonates” with the incident waves. [ 6 ] In real wave conditions, where long‐period waves dominate, the floater usually needs a larger mass and scale to reduce its intrinsic frequency, so as to match the wave frequency as much as possible in order to obtain a higher capture power.…”