水下系留平台惯性波能装置的非线性宽频俘能机理研究

The near-surface underwater mooring platform (UMP) is a kind of significant equipment for ocean detection. Due to limited energy, the UMP is difficult to achieve long-time and continuous working capacity. A small inertial wave energy converter (IWEC) enclosed inside the UMP can harvest wave energy effectively, and provide energy replenishment for the UMP, which can significantly enhance the long-time operation capacity of the UMP. However, the investigation of the IWEC is mainly based on linear theory at present, which leads to the IWEC has only one single natural frequency together with a narrow resonance frequency band. This phenomenon results in frequency mismatching and wave energy harvesting performance reduction under broadband wave excitations. Thus this project intends to introduce appropriate nonlinear mechanism and conduct mechanism investigation on broadband energy harvesting of the IWEC. The numerical simulation method of the rotating IWEC is established under multi-parametric excitations. The nonlinear dynamic behavior of the harvesting system is revealed, and the influence rule of nonlinear on resonance bandwidth and energy harvesting performance is analyzed. The analytical analysis method for large period motion or chaotic motion of the IWEC under multi-parametric excitations is established, respectively. The physical mechanism of nonlinear factors broadening the IWEC’s resonance bandwidth is revealed. The experimental testing method of the broadband IWEC is established to evaluate and correct the IWEC’s numerical simulation method and analytical analysis method. The research of this project will provide a solid theoretical foundation and technical support for the engineering application of the broadband IWEC on UMPs.

近水面水下系留平台是海洋探测的重要装备，由于携带能源有限，无法长时间持续工作。安装于平台内的惯性波能装置可以有效利用波浪能对平台进行能源补给，可有效提升平台长时间执行任务的能力。目前研究的惯性波能装置大多是基于线性理论，仅具有单一固有频率，共振频带窄，很难在宽频波浪激励下达到共振状态，导致波浪能俘获性能大幅度减小。为此，本项目拟引入合适的非线性机理深入开展水下系留平台惯性波能装置的宽频俘能机理研究。建立多参数激励下旋转式惯性波能装置的数值模拟方法，揭示系统的非线性动态行为，分析非线性对共振带宽和俘能特性的影响规律；建立旋转式惯性波能装置大幅周期和混沌运动的解析分析方法，揭示非线性因素拓宽系统共振带宽的物理机制；建立宽频带惯性波能装置的实验测试方法，评估和修正惯性波能装置的数值模拟和解析分析方法。研究成果将为宽频带惯性波能装置在水下系留平台上的工程应用提供坚实的理论基础和技术支撑。

近水面水下系留平台是海洋探测的重要装备，由于携带能源有限，无法长时间持续工作。安装于平台内的惯性波能装置可以有效利用波浪能对平台进行能源补给，可有效提升平台长时间执行任务的能力。本项目引入合适的非线性机理深入开展了水下系留平台惯性波能装置的宽频俘能机理研究。建立了多参数激励下旋转式惯性波能装置的数值模拟方法，揭示了系统的非线性动态行为，分析了非线性对共振带宽和俘能特性的影响规律；建立了旋转式惯性波能装置大幅周期和混沌运动的解析分析方法，揭示了非线性因素拓宽系统共振带宽的物理机制；建立了宽频带惯性波能装置的实验测试方法，评估和修正了惯性波能装置的数值模拟和解析分析方法。研究成果为宽频带惯性波能装置在水下系留平台上的工程应用提供了坚实的理论基础和技术支撑。