直接驱动浮子式波浪能转换装置频域模拟研究

FREQUENCY DOMAIN MODELING AND ANALYSIS OF A DIRECT DRIVE POINT ABSORBER WAVE ENERGY CONVERTER

基于线性波理论,仅考虑浮体的垂荡运动,并假设能量输出系统是线性的,建立直接驱动的浮子式波浪能转换装置频域运动方程,获取该系统的频率响应函数,推导该系统能量俘获宽度在规则波和随机波浪条件下的表达式,研究浮体形状、频率响应函数、能量输出系统阻尼系数及海洋波浪条件对能量俘获宽度的影响。数值算例结果表明:系统固有频率与波谱谱峰频率越接近,频率响应函数的幅值越大,能量输出系统的阻尼系数越大,则系统的能量俘获宽度越大。

Based on the linear wave theory, by assuming the power take off force （PTO） was modeled to be linear and restricting the consideration of heave motion, the equation of motion of a direct drive point absorber wave energy converter （WEC） in the frequency domain was established, and its frequency response function （FRF） was obtained. The expression of power capture width in regular and random waves were derived, the influence of buoy geometry, FRF, PTO damping coefficient and wave climate on power capture width were investigated. It is found that the smaller difference between the natural frequency and the peak frequency of the wave spectrum, the larger amplitude of the FRF, and the greater PTO damping coefficient can lead to a relatively larger power capture width.