摘要
风本身的脉动，能与海洋工程低频系统共振．鉴于风载荷的非线性，载荷谱将与二阶风速谱有关．本文指出，由于风速谱与波浪谱不同，它的能量峰值位于极低频率处，因此二阶风速谱中和频项的贡献不能忽略，为此本文首先导出了保留和频项情况下的二阶风速谱表达式，并将和频项与差频项在数值上作了比较．文中对一阶风速谱也作了归纳．
The turbulence in the wind field is potential to resonate with the low frequency motion system. Because of the nonlinear character of wind load, the spectrum of the wind load is in correspondence with the second order wind spectrum. This paper points out that as the peak of the first order wind spectrum situated at a region of very low frequency, the contribution of the sum_frequency part to the second order wind spectrum is no longer negligible. A complete expression is thus presented in the paper for the first time. The contribution of the sum_ and differential_frequency parts is numerically compared. Available information on first order wind spectra is also summed up.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
1998年第8期42-47,共6页
Journal of South China University of Technology(Natural Science Edition)
关键词
二阶风速谱
和频项
海洋工程
风荷
低频系统
second order wind spectrum
sum_frequency part
low frequency motion system
