自动三翻广告牌流场及关键部件受力计算与分析

发布时间：2018-08-12 20:48

【摘要】：本文针对繁华街头高楼楼顶的广告牌体积庞大,风阻较大,在强风下经常发生破坏,存在较大安全隐患,造成了很大的人员伤亡及财产损失的情况,构思出了带有导流板的新型大型三面翻转广告牌。该广告牌实现了结构简单,安装方便,可以大幅度使风阻降低,提升广告牌的通流性及安全和可靠程度,无需在广告牌的背后安装巨大的支撑钢筋骨架,使广告牌的体积减小,成本大大的降低,同时还提高了广告牌的能源利用率。本课题基于流体力学及流体动力学理论,首先利用SolidWorks三维软件建立了风载荷下的新型大型自动三翻广告牌的三维模型,利用Fluent软件分析了自动三翻广告牌转动三棱柱不同转角以及风载荷不同方向时的多种情况,得出了广告牌的流场、压力以及速度分布的情况;其次通过对自动三翻广告牌结构进行改进,将一整块遮光板改变成交错安放的内外两层导流板,以优化广告牌的风阻,提高广告牌的可靠度,并利用Fluent软件分析得出改进后广告牌不同情况时的流场、压力以及速度分布情况,将得出的结果与改进前进行对比,证明改进后的结构降低了风阻,提高了广告牌的安全性;最后利用ANSYS软件对自动三翻广告牌改进后的关键部位进行静力分析和模态分析,分析其变形情况、受力情况,并且检验关键部件的强度是否达到许用标准。
[Abstract]:In this paper, the billboards on the roof of busy street buildings are large in volume, large in wind resistance, often destroyed under the strong wind, and have a large hidden danger of safety, resulting in a lot of casualties and property losses. A new type of large three-sided flip billboard with guide plate is designed. The billboard has the advantages of simple structure and convenient installation. It can greatly reduce the wind resistance, improve the fluidity, safety and reliability of the billboard, and it does not need to install a huge supporting steel frame behind the billboard, so that the volume of the billboard can be reduced. The cost is greatly reduced, but also increases the energy efficiency of billboards. Based on the theory of hydrodynamics and hydrodynamics, a new 3D model of large automatic triple turn billboard under wind load is established by using SolidWorks software. By using Fluent software, the paper analyzes various situations when the three prism column rotates at different angles and wind loads in different directions, and obtains the flow field, pressure and velocity distribution of the billboard. Secondly, by improving the structure of the automatic triple flip billboard, the whole board is changed into a staggered inside and outside two layer diversion plate, in order to optimize the wind resistance of the billboard and improve the reliability of the billboard. The flow field, pressure and velocity distribution of the improved billboard under different conditions are analyzed by using Fluent software. The results obtained are compared with those before the improvement. It is proved that the improved structure reduces the wind resistance and improves the safety of the billboard. Finally, the static analysis and modal analysis of the improved key parts of the automatic triple turn billboard are carried out by using ANSYS software to analyze the deformation and stress, and to check whether the strength of the key parts is up to the allowable standard.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU311

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