摘要
为了开发海上风能资源,探索浮式风力机平台响应特性,设计了一种半潜式海上浮式风力机平台样机。利用风压模型模拟风力机气动载荷,基于势流理论和Morison方程计算水动力载荷,并根据阻尼矩阵计算阻尼力和系泊线载荷,建立了海上浮式风力机运动响应数值模型。制作了1/50的试验模型,并在水池进行水动力实验,对垂荡板在设计中的作用进行了验证,测量了模型的固有周期、衰减系数以及规则波条件下的响应等,对比发现数值模型结果与实验结果吻合较好。在无风和额定工况下进行系统随机响应特性数值分析,通过统计数据和响应频谱研究了风力机气动载荷对风力机平台运动特性的影响。发现该系统数值模型时效性好并可以真实反映浮式风力机平台的运动特性,平台垂荡、纵摇、纵荡的响应结果满足海上浮式风力机系统对平台的性能要求。设计中加入垂荡板使平台垂荡和纵摇的固有周期和衰减系数增加,提高了系统的稳定性。风力机气动载荷对纵摇传递函数产生有益的抑制,但会放大纵摇和纵荡在共振区的响应。
A semi- submersible platform was designed for wind energy exploration and response characteristics comprehension. In numerical simulation, the whole numerical model of motion response for floating offshore wind turbine was established by three parts： the aerodynamic load simulated through the wind pressure model as which the wind turbine was simplified; the hydrodynamic load calculated by potential theory and Morison equation; the damping force and mooring load gained by damping matrix. A 1/50 scale model was made for hydrodynamic test, in which the effect of heave plate is verified, Meanwhile, natural frequencies, damping coefficients and RAOs of the models in regular waves were obtained and the numerical results match well with the test data. The influences on the platform response characteristics by the aerodynamic load were studied numerically through statistic data and response spectrums under no wind condition and operation condition. The results have shown that the numerical model is efficient and is able to reflect the motion behavior of the platform; heave, pitch and surge RAOs can meet the requirements of platform design. Both the natural periods and the attenuation coeffcients of heave and pitch were increased by heave plate, and the stability of system is improved as a result. The aerodynamic load has beneficial effects on reducing the pitch response amplitude operator, though, will amplify pitch and surge response in resonance zone,
出处
《科技导报》
CAS
CSCD
北大核心
2014年第2期15-20,共6页
Science & Technology Review
基金
国家自然科学基金项目(51309069
50979020)
中央高校基本科研业务费专项资金项目(HEUCF110132
HEUCF130105)
哈尔滨市科技创新人才研究专项项目(RC2013QN008014)
关键词
海上浮式风力机
半潜式平台
模型试验
响应特性
floating offshore wind turbine
semi-submersible platform
model test
response characteristics
