三维风场各分量对定日镜动态响应的影响研究

发布时间：2018-01-18 06:10

本文关键词：三维风场各分量对定日镜动态响应的影响研究　出处：《振动与冲击》2017年08期 　论文类型：期刊论文

【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。
[Abstract]:In order to solve the problem that vertical wind and transverse wind are ignored in the design of helioscope wind resistance, the vertical wind and transverse wind are ignored. In this paper, the time-history simulation of three dimensional pulsating wind field is carried out by using the power spectrum of pulsating wind pressure and AR model in different directions, and the mean wind load and pulsating wind load are combined in the established finite element model of the helioscope. By analyzing the dynamic characteristics and wind-induced dynamic response of the helioscope in five typical positions, the influence of the wind field load on the structure is obtained. The results show that the frequency range of the natural vibration is within the range of the five order natural vibration before the fixed day mirror. The vertical and transverse pulsating wind may cause the resonance response of the structure. The displacement wind vibration coefficient of the helioscope in the working position is small, so the influence of longitudinal and vertical wind on its dynamic response can only be considered. The displacement wind-induced vibration coefficient of the sunspot mirror is large when it is parked in a safe place, and the influence of longitudinal, vertical and transverse wind on its dynamic response should be considered simultaneously.
【作者单位】：重庆大学机械传动国家重点实验室;
【基金】：重庆市研究生科研创新项目(CYB14010)
【分类号】：TU312.1;TM615
【正文快照】： 定日镜是塔式太阳能热发电系统中的重要聚光设备,其不仅数量众多、占地面积巨大,而且是塔式太阳能热发电站的主要投资部分,其建造费用约占发电系统总造价的一半以上[1-2]。定日镜的主要作用是跟踪太阳运动并将接收的太阳光反射到远处吸收塔顶部的集热器上。由于太阳能热发电站

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