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Non-Linear Modeling of a Vibro-Impact Wave Energy Converter
IEEE Transactions on Sustainable Energy ( IF 8.8 ) Pub Date : 2020-07-08 , DOI: 10.1109/tste.2020.3007926
Bingyong Guo , John V. Ringwood

This article proposes a non-linear vibro-impact mechanism, integrated inside a semi-submerged cylindrical buoy to form a self-contained and self-referenced vibro-impact wave energy converter (VIWEC), for performance enhancement. A non-linear mathematical model of the VIWEC is derived, considering linear wave-buoy interaction and non-linear vibro-impact mechanics. Numerical simulations are conducted to investigate the influence of the vibro-impact mechanism on the VIWEC's dynamics and performance. Numerical results conclude that the VIWEC is characterised by a band-pass frequency response and inherently decoupled from ocean waves of low frequencies, indicating high survivability under extreme sea states. The vibro-impact mechanism can also broaden the VIWEC's power capture bandwidth and limit the VIWEC's motion within its physical constraint. On the other hand, the VIWEC's dynamics are sensitive to design parameters, and an improper design may lead to rich and complex non-linear dynamics of the VIWEC, e.g. chaos and multi-stability. The proposed non-linear model can provide a platform for design optimisation and control development of the VIWEC.

中文翻译:

冲击波能量转换器的非线性建模

本文提出了一种非线性振动冲击机制,该机制集成在半浸入式圆柱形浮标内,以形成一个自包含且自参考的振动冲击波能量转换器(VIWEC),以提高性能。考虑到线性波浮标相互作用和非线性振动冲击力学,得出了VIWEC的非线性数学模型。进行了数值模拟,以研究振动冲击机制对VIWEC动力学和性能的影响。数值结果表明,VIWEC的特征在于带通频率响应,并且固有地与低频海浪解耦,表明在极端海况下具有很高的生存能力。振动冲击机制还可以拓宽VIWEC的功率捕获带宽并限制VIWEC' 在其物理约束范围内的运动。另一方面,VIWEC的动力学特性对设计参数敏感,设计不当可能导致VIWEC的非线性特性丰富而复杂,例如混乱和多重稳定性。所提出的非线性模型可以为VIWEC的设计优化和控制开发提供平台。
更新日期:2020-07-08
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