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为准确地评估网架结构的健康状况,针对网架结构的损伤特点,提出了一种基于模糊模式识别理论的有限元模型修正方法。首先引入节点固结系数的概念,由节点固结系数表示空间网架结构的单元刚度矩阵,建立了结构的动力方程。再根据结构的动力特性建立了标准模糊集合,通过模糊模式识别方法对结构的有限元模型进行修正。最后对一个二层空间平板网架结构进行了数值仿真分析,结果表明,该方法能有效地修正结构的有限元模型,在工程应用中具有一定的实用价值。
In order to accurately evaluate the health condition of the grid structure, aiming at the damage characteristics of the grid structure, a method of finite element model correction based on fuzzy pattern recognition theory is proposed. Firstly, the concept of node consolidation coefficient is introduced, and the element stiffness matrix of space grid structure is expressed by the node consolidation coefficient, and the dynamic equation of the structure is established. According to the dynamic characteristics of the structure, a standard fuzzy set is established, and the finite element model of the structure is corrected by the fuzzy pattern recognition method. Finally, the numerical simulation of a two-story space-grid structure is carried out. The results show that the method can effectively correct the finite element model of the structure and has certain practical value in engineering application.