摘要
研究涡激振动的有限元计算。应用条带假设和在锁定响应时涡激作用力的Scanlan第二经验模型可以实现涡激作用力在时间和空间上的离散化;由于涡脱落激励中复杂的结构与尾流相互作用,使振动方程具有非线性的时间与频率混合项,为此本文推导了时频域混合变换的AFT方法计算涡激振动的时程响应。与传统的连续模型和随机振动理论计算涡激响应方法相比,具有更高的适应性。
This paper studies the computation of vortex-induced responses by finite element models. The strip hypothesis in conjunction with the second Scanlan抯 vortex shedding half-empirical and half-analytical model are employed to discretize the vortex-excitation force in both time and space. An Alternating Time Frequency (AFT) domain method is developed to solve the assembled equations of motion in order to account for the mixed non-linear time-frequency terms that are evoked by the complex wake-structure interaction process in vortex-shedding excitations. The proposed approach is shown to be more flexible than the traditional methods adopting continuous models or stochastic approaches.
出处
《工程力学》
EI
CSCD
北大核心
2003年第5期200-203,共4页
Engineering Mechanics
