摘要
本文针对半刚性节点结构的节点及边界条件的有限元模型修正问题进行了研究。由于现有的修正算法均是针对半刚性节点所具有的转动柔性进行研究，而实际结构的节点往往沿剪切方向也具有一定的柔性，所以为了同时修正半刚性节点所具有的转动及剪切柔性，本文提出了一种适合于有限元模型修正的混合梁单元。此外，针对结构边界条件的模型修正问题，提出了一种参数化的修正方法。最后，将本文所提方法应用于一个梁式结构的有限元模型修正问题。通过测试得到的结构频率、振型成功修正了该梁式结构的节点及边界的连接刚度，从而验证了本文所提方法的可行性。
Abstract
In this paper, updating the finite element model of semi-rigid jointed structures is studied. Firstly, a hybrid finite element is proposed, composed of a beam element with two connections at both ends, in order to consider the semi-rigidity of joints of both rotation and shear effect. This hybrid finite element is suitable for model updating, and the stiffness matrix and mass matrix of the proposed element are described. Secondly, a parameterized scheme to update the boundary support parameters is presented. Finally, the proposed hybrid finite element and parameterized method are experimentally studied by updating the finite element of a 14-bay frame with test modal parameters. The results show that the proposed methods are suitable for model updating of semi-rigid jointed structures.
关键词
结构有限元模型修正 /
半刚性节点 /
优化技术 /
混合梁单元
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Key words
Structural model updating /
Semi-rigid joints /
Hybrid finite element /
Optimization technique.
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刘 洋 段忠东 .
利用一种混合梁单元修正结构半刚性节点及边界条件[J]. 振动与冲击, 2009, 28(9): 39-47
Yang Liu Zhongdong Duan.
Updating the Semi-rigidity of Joints and Boundary Conditions of Structures Using a Hybrid Finite Element[J]. Journal of Vibration and Shock, 2009, 28(9): 39-47
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