Internal structural components include spars, ribs, frames, and bulkheads. This paper presents a novel approach for automated generation of fully connected finite- element meshes for all internal structural components and skins of a given wing-body geometry model, controlled by a few conceptual-level structural layout parameters.

The predetermined algorithm may include the steps of generating two-dimensional cell regions in dual space, determining existing nodes in primal space, generating new nodes in the dual space, and connecting nodes to form the quadrilateral elements (faces) for the generated and modifiable surface mesh.Īutomated Generation of Finite- Element Meshes for Aircraft Conceptual Design After generating a dual of a surface ( mesh), a predetermined algorithm may be followed to generate and modify a surface mesh of quadrilateral elements. Shepherd, Jason F [Albuquerque, NM Benzley, Steven [Provo, UT Grover, Benjamin T [Tracy, CAĪ method and machine-readable medium provide a technique to generate and modify a quadrilateral finite element surface mesh using dual creation and modification. The presented geometric mesh-generator is universally applicable and allows an automated and accurate modeling by combining the advantages of the voxel-technique and of improved surface-modeling. This algorithm also allowed the best representation of anatomical details. The geometric model of the 3D-skullbase resulted in the lowest element-energy error and volume error. The highest element-energy error as a criterion for the mesh quality was 2.61x10(-2) N mm, 2.46x10(-2) N mm and 1.81x10(-2) N mm for unsmoothed, smoothed and geometric voxel models, respectively. Compared to the analytic calculation of the 3D-pipe-section model the normalized RMS error of the surface stress was 0.173-0.647 for the unsmoothed voxel models, 0.111-0.616 for the smoothed voxel models with small volume error and 0.126-0.273 for the geometric models. Models of an artificial 3D-pipe-section and a skullbase were generated with different mesh-densities using the newly developed geometric, unsmoothed and smoothed voxel generators. We developed an automated mesh-generator that combines the advantages of voxel-based generation with improved representation of the geometry by displacement of nodes on the object-surface. Nonetheless their geometric precision is limited. Voxel-based as opposed to contour-based algorithms allow an automated mesh generation based on the image data. The FE-modeling of complex anatomical structures is not solved satisfyingly so far. Kaminsky, Jan Rodt, Thomas Gharabaghi, Alireza Forster, Jan Brand, Gerd Samii, Madjid Because ESCHER was expected to be highly interactive, extensive user documentation was provided in the form of an interactive HELP package.Ī universal algorithm for an improved finite element mesh generation Mesh quality assessment in comparison to former automated mesh-generators and an analytic model. Modules of this file correspond to separate editing modes in the mesh editor, with data definition syntax preserved between the interactive commands and the archival storage file. The archival storage and restart file is a modular, entity-based mesh data file.

Also described is the interactive command language and the use of interactive graphics. Two important ESCHER capabilities, interactive geometry creation and mesh archival storge are described in detail. Consideration is also given to both a priori and a posteriori mesh control devices for automatic mesh generators as well as their integration with geometric modeling and adaptive analysis procedures.ĮSCHER: An interactive mesh-generating editor for preparing finite- element inputĮSCHER is an interactive mesh generation and editing program designed to help the user create a finite- element mesh, create additional input for finite- element analysis, including initial conditions, boundary conditions, and slidelines, and generate a NEUTRAL FILE that can be postprocessed for input into several finite- element codes, including ADINA, ADINAT, DYNA, NIKE, TSAAS, and ABUQUS. It is demonstrated that because of the modeling demands placed on a automatic mesh generator, all the approaches taken to date produce unstructured meshes. The algorithmic approaches being taken to the development of finite element mesh generators capable of automatically discretizing general domains without the need for user intervention are discussed. Approaches to the automatic generation and control of finite element meshes

Adina meshfree group