Dynamics of floating water-wave energy extraction devices

从本质上讲，海洋是一个永动机，拥有巨大的能量储备，其中一些以波浪的形式传递到海岸线。这种能源的提取是可再生能源中最大的未充分利用的分支之一，英国在利用这种能源方面处于有利地位：英国海岸线吸引了整个欧洲可用的全部波浪能的大约35%。尽管用于从海浪提取能量的各种波浪能转换器（WEC）已经存在很长时间，直到最近，政府和工业界才产生了强烈和雄心勃勃的兴趣，并且用于从海浪环境中提取能量的潜在WEC的数量正在增长。对这项建议感兴趣的是OWEL WEC。它是一个漂浮的矩形装置，一端开放，允许波浪进入。它是一种与海浪相互作用的系泊深水海上结构物。波浪能通过动力输出系统提取。这是最难建模的WEC之一。本提案的兴趣在于解决三个主要的数学建模问题：（1）波浪被困在船舶内后的动力学，（2）组件之间的共振效应，以及（3）由于内波、环境海洋波场、船舶动力学和系泊动力学之间的多重耦合而产生的动态反馈。最终的目标是建立一个模型，从周围的海洋波场开始，描述了详细的过程，从而提取这种能量并将其输送到动力输出系统。

The ocean is, essentially, a perpetual motion machine with vast reservoirs of energy, some of which is delivered to the shoreline in the form of waves. The extraction of this energy is one of the great under-utilized branches of renewable energy, and the UK is well placed to exploit this energy: the UK shoreline attracts about 35% of the total wave energy available to ALL of Europe.Although various wave energy converters (WECs) for the extraction of energy from ocean waves have been aroundfor a long time, it is only recently that both government and industry have developed a strong and ambitious interest,and the number of potential WECs for extraction of energy from the ocean wave environment is growing. The interest in this proposal is the OWEL WEC. It is a floating rectangular device open at one end to allow waves in. It is a moored deep-water offshore structure interacting with ocean waves. The wave energy is extracted via a power take-off system. It is one of the most difficult WECs to model.The interest in this proposal is to tackle three main mathematical modelling issues: (1) the dynamics of the waves once they are trapped inside the vessel, (2) the effect of resonance between components, and (3) the dynamic feedback due to multi-fold coupling between interior waves, the ambient ocean wave field, vessel dynamics and mooring dynamics. The ultimate goal is to build up a model which, starting with an ambient ocean wave field, describes the detailed process whereby this energy is extracted and delivered to the power take off system.