Wave Generation And Absorption Using Force-controlled Wave Machines
Wave Generation And Absorption Using Force-controlled Wave Machines
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使用力控造波机产生和吸收波浪
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
C. Swan
中科院分区：
文献类型：
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作者：
J. Spinneken;C. Swan
最近的研究波浪发电利用吸收力控制机器已经显示出三个关键因素：（i）需求信号和表面高程之间的理论传递函数可以推导出来;（ii）高吸收效率可以在很宽的频率范围内实现和（iii）很少二阶杂散内容时，引入一阶需求信号驱动。到目前为止，理论和实验工作都仅限于产生规则的波列和铰接波板的几何形状。本研究延伸这项工作的不规则波的生成考虑挡板和活塞型造波机。同时限制讨论的影响，在一阶，特别是解决理论传递函数和吸收效率，寻求提高机器的控制器的理解。所实施的吸收策略是基于控制所施加的力和波板速度之间的复杂关系。的最佳的因果控制器，这个特定的战略的性质进行了调查，因果关系，因此，实用，近似推导。基于无限脉冲响应滤波器（IIR）和直接优化的频域因果控制器被认为是。这种方法的相对优点相比，在时域中的近似的基础上的方法。还提供了实验证据来证实IIR建模方法。结果是直接相关的许多安装的力控制波机的操作，提供指导，以其他有效的操作，有助于波能的辩论，并可以被纳入先进的数值波浪坦克，以提供同时发电和吸收。
Recent research on wave generation utilizing absorbing forcecontrolled machines has shown three key factors: (i) a theoretical transfer function between demand signal and surface elevation can be derived; (ii) high absorption efficiency can be achieved over a wide range of frequencies and (iii) little second-order spurious content is introduced when driven with a first-order demand signal. Thus far, both theoretical and experimental work has been limited to the generation of regular wave trains and hinged wave board geometries. The present study extends this work to the generation of irregular waves considering both flapand piston-type wave machines. Whilst limiting the discussion to the effects arising at first-order, specifically addressing the theoretical transfer function and absorption efficiency, an enhanced understanding of the machine’s controller is sought. The implemented absorption strategy is based on controlling the complex relationship between applied force and wave board velocity. The properties of the optimum a-causal controller for this particular strategy are investigated and a causal, hence practical, approximation is derived. A causal controller based on infinite impulse response filters (IIR) and direct optimization in the frequency domain is considered. The relative merits of this approach are compared to methods based on an approximation in the time domain. Experimental evidence is also provided to substantiate the IIR modelling approach. The results are directly relevant to the operation of many installed force-controlled wave machines, provide guidance as to the effective operation of others, contribute to the wave power debate and could be incorporated within advanced numerical wave tanks to provide simultaneous generation and absorption.