基于摄影测量的充气膜结构有限元建模方法

发布时间：2018-06-20 04:21

本文选题：充气膜结构 + 有限元模型　；参考：《工程力学》2017年03期

【摘要】：为了对正常使用过程中的充气膜结构进行荷载和动态特性等进一步分析和安全评价,提出了基于摄影测量的在役充气膜结构有限元模型建立方法。首先,采用三维摄影测量法对正常使用过程中的充气膜结构外形进行测量,并利用压力传感器测得相应的充气内压。然后,基于测量的外形及内压,将连续的膜面离散为膜线,并将内压按从属面积分配到相应的节点上,应用引入线性调整理论的索杆体系找力分析理论对膜线的力密度进行计算。随后,基于杆系结构平衡矩阵理论和小变形假定,应用非线性协调矩阵广义逆法,对结构的零应力态进行求解。最后,将得到的零应力态作为初始模型,利用有限元软件对其进行充气数值模拟,得到正常使用状态下的充气膜结构有限元模型。通过ETFE气枕模型的测量试验,验证了所提出的方法。
[Abstract]:In order to further analyze and evaluate the load and dynamic characteristics of aerated membrane structure in normal use, a method of establishing finite element model of in-service aerated membrane structure based on photogrammetry is proposed. Firstly, three-dimensional photogrammetry is used to measure the structure shape of aerated membrane during normal use, and the pressure sensor is used to measure the corresponding inflatable internal pressure. Then, based on the measured shape and internal pressure, the continuous film surface is discretized into a film line, and the internal pressure is distributed to the corresponding node according to the dependent area. The force density of membrane line is calculated by the force finding theory of cable and bar system with linear adjustment theory. Then, based on the equilibrium matrix theory and the assumption of small deformation, the nonlinear coordination matrix generalized inverse method is used to solve the zero stress state of the structure. Finally, the zero stress state is taken as the initial model, and the finite element model of the aerated membrane structure is obtained by using the finite element software. The proposed method is verified by the test of ETFE air pillow model.
【作者单位】：上海交通大学空间结构研究中心;
【基金】：国家自然科学基金项目(51278299,51478264)
【分类号】：TU383

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