摘要
双圆柱形浮体作为吸收波浪能量的载体已在实际中得到应用,其振动特性研究对于波能装置设计及提高转换效率具有指导作用。文章采用线性波理论和特征函数展开匹配法,求解了双圆柱形浮体垂荡辐射问题和绕射问题,基于粘性阻尼吸取波浪能,建立了振荡浮体的一维运动方程,以此方程推导了波能装置的振动特性和转换效率表达式。数值分析表明波能装置的固有振荡周期是随入射波周期变化而变化的,水下浮体对振荡浮体的振荡和能量转换特性有一定的影响,但只要两者的距离适当远,水下浮体对波能装置的振荡特性和转换效率的影响可忽略不计;研究表明根据不同的波况正确选择弹性系数和外部阻尼可提高波能装置的转换效率。
Double cylindrical floats were proposed as a device for extracting energy from waves. The study on the oscillating property of the device can help to design the device and improve the conversion efficiency of the device. Based on the linear wave theory and the method of matched eigenfuntion expansions, the ve locity potential about the radiation and diffraction problems is derived for the twobody system. Consid ering the viscous damper resistance absorbing the wave energy, the onedimensional dynamics equation is formed. The expressions about the oscillating properties and the conversion efficiency of the device are de duced from the equation. Numerical calculation indicates that the natural period of the device varies with the incident wave period and the presence of the submerged cylinder has effect on the oscillation proper ties and the conversion efficiency, while its influence can be ignored if the distance of the cylinders is appro priate. It is found that choosing the right coefficient wave conversion efficiency according to different wave of elasticity and external damping can improve the conditions.
出处
《船舶力学》
EI
CSCD
北大核心
2013年第11期1253-1261,共9页
Journal of Ship Mechanics
基金
国家自然科学基金(51079138)
国家十一五863计划项目(2009AA05Z428)
关键词
双圆柱形浮体
速度势
振动特性
转换效率
double cylindrical floats
velocity potential
oscillating properties
conversion efficiency
