三维风场各分量对定日镜动态响应的影响研究  

Effect of each direction component in 3D wind field on dynamic response of heliostat

作　　者：冯煜[1] 陈小安[1] 

机构地区：[1]重庆大学机械传动国家重点实验室,重庆400044

出　　处：《振动与冲击》2017年第8期156-163,共8页Journal of Vibration and Shock

基　　金：重庆市研究生科研创新项目(CYB14010)

摘　　要：针对定日镜抗风设计过程中仅考虑纵向风而忽略竖向风和横向风对结构响应的问题,提出利用不同方向上的脉动风压功率谱和AR模型进行三维脉动风场的时程模拟,并将平均风荷载和脉动风荷载共同作用在建立的定日镜有限元模型上,通过对5种典型位置状态下定日镜的动力特性和风致动态响应分析得到风场各分量荷载对结构的影响。研究结果表明:在定日镜前5阶自振频率范围内,竖向和横向脉动风可能会引起结构的共振响应;定日镜在工作位置时的位移风振系数较小,可以仅考虑纵向和竖向风对其动态响应的影响;定日镜在避险停放位置时的位移风振系数较大,需同时考虑纵向、竖向和横向风对其动态响应的影响。In the process of the wind-resistant design of heliostat, only longitudinal wind was considered and vertical and transverse winds were neglected in literature. For this reason, power spectrums of fluctuating wind pressure in different wind directions and an AR model were proposed to simulate time history samples for 3D wind field in this work. And then the mean wind loads and fluctuating wind loads were applied to the finite element model of the heliostat. The effects of each direction component of the wind field on heliostat were investigated by evaluating dynamic characteristics and wind-induced dynamic responses of the heliostat in five positions. The results show that the vertical and transverse fluctuating winds may cause the resonant response in the first five natural frequencies of the heliostat. Furthermore, the wind vibration coefficients of displacement for operational positions are small, in which only the longitudinal and vertical winds can be taken as the influence factors of dynamic responses. In contrast, the wind vibration coefficients of displacement are large as well as the longitudinal, vertical, and transverse winds should be taken into account simultaneously when the heliostat is in survival stow positions. © 2017, Editorial Office of Journal of Vibration and Shock. All right reserved.

关 键 词：定日镜 三维风场 脉动风压功率谱 AR模型 动态响应 

分 类 号：TK513.1[动力工程及工程热物理—热能工程]