Finite Element Mesh Optimization Algorithm Considering Structural Feature Weight

In the CAD/CAE integrated ship finite element modeling process,meshing based on geometric models is needed.However,for a complex geometric structure,the mesh generated by the existing mesh automatic partitioning program is often difficult to meet the quality requirements.Especially for complex multi-component structures such as ships,because there are usually short geometric edges at the connection points of multiple components,short element edges tend to be generated during meshing,resulting in slender and small element in the mesh.These unqualified elements will seriously affect the accuracy and stability of finite element analysis.Therefore,mesh optimization becomes an indispensable step in this process.For this reason,based on the existing edge collapsing simplification method,this paper develops a new ship finite element mesh optimization algorithm considering the structural feature weights.First of all,this paper introduces the CAD/CAE integrated ship finite element modeling process.Based on the principle of mesh generation and combined with the mesh quality requirements that finite element analysis needs to meet,this paper discusses the existing mesh quality defects after mesh partitioning,and proposes the necessity of mesh shape optimization.Then,this paper proposes a new finite element mesh optimization algorithm based on the edge collapsing simplification method for shipboard frame structure to remove the unqualified elements in the mesh and improve the mesh quality.The algorithm considers the collapsed element shape when collapsing edges,preferentially collapses the shortest element edge,avoids the appearance of slender and small elements,and ensures the quality of the mesh element.By considering the weights of the features associated with the mesh nodes,the structural importance of the nodes is quantified approximately.On this basis,the weights of the nodes at both ends of the element edge are compared to determine the direction of edge collapsing.When the edges are collapsed,the nodes with greater weight values are preferentially reserved,so that the important structural features on the model are preserved.The collapsing queue is constructed by the priority queue method,which ensures the efficiency and stability of the algorithm.This paper uses C++ language to implement the algorithm on the NX platform,and uses the ship finite element mesh model generated by the CAD/CAE integration platform as an example to verify the algorithm.Experimental results show that the quality of the mesh optimized by the algorithm has been greatly improved,the important structural features of the original geometric model have been well maintained,the efficiency of the algorithm is high,and it can meet the needs of engineering applications.