hm70_basic_day2_draft_121304.pdfHyperMesh基础培训第二天网

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详细说明：HyperMesh基础培训第二天网格划分优化功能模型装配Chapter 1: Preparing Geometry for Meshing Preparing Geometry for Meshing Realities of using Cad geometry for FEA Geometry requirements for CAd are different from FEA CAD needs an exact representation FEA only needs a simplified representation Depending on the problem, the part can be simplified for easier meshing or analysis geometry can sometimes have errors when imported a Preparing geometry for meshing allows us to Correct any errors in the geometry from import Create the simplified part needed for the analysis Mesh a part all at once Ensure proper connectivity of mesh Obtain a desirable mesh pattern quality This allows much less cleanup after meshing! Preparing Geometry for Meshing Import and repair Cad geometry data( topology repair) Create mid-surfaces Simplify geometry details(defeaturing) Modity surface topology to obtain quality mesh( topology refinement Location in the cae Process Design Model Analyze Visualize Report Mesh Geometry Analysis Preparing Geometry for Meshing: Tools A Geometry page: geom cleanup, defeature, surface edit, autocleanup, midsurface eometry user profile: HyperMesh create nodes geam cleanup G Geom collectors defeature assemblies Intersect fillets surface edit utocleanup c remap temp nodes reorde stems prot.C Post A 2D page: automesh: cleanup 2-D Elements and Surfer user profile: HyperMesh omp. loacal「 ruled edit elemen:」 collectors splIne assemblies compos tes HyperLaminate color elem types Po Preparing Geometry for Meshing: Tools Isolde Surfc Geom page of the macro menu Washer Has some useful tools for working with geometry not found elsewhere in HyperMesl Has shortcuts to functions in geom cleanu automesh: cleanup, defeature, surface edit = panels, and Shortcuts are organized by the type of entity they work wit Very useful for quick access to various functions brag SwEep ng ge 2ND』Plat Mesh Chapter 1: Preparing Geometry for Meshing Section 1 Repairing CAD Geometry Data Topology Repair Topics Importing geometry Understanding topology and topology repair Process of repairing topology Tools for repairing topology Hands-on practice Topology Repair: Importing Geometry Import geometry data via the files-> import sub-pane C HMMODE GFO A Common types of geometry files supported Unigraphics(UG Part Browser) ·LGEs nport of*. prt file Import of*. igs/.iges files Requires an installation of Unigraphics to STEP import of ". stp files CATIA rt of * model??? files CATIA v5 license required to import CAtIA v5 files Pro/enGineeR Topology Repair: Surface Definitions ▲ Fixed point(“ Surface vertex Surface Point associated with a surface Cannot be moved off the surface Can lie on a surface edge or the interior"of a surface Separates surface edges from farces a node to be placed at tha location during meshing ▲ Surface edg Line associated with a surface Defines a surface's boundary Cannot be moved off the surface Has a fixed point on both ends Topology Repair: What is“ Topology”? TOpology" is how surfaces connect to adjacent surfaces of a part Surface connectivity is controlled by the associated surface edges If a surface edge is associated with more than 1 surface, those surfaces are considered to be connected (equivalenced") Surface edges are categorized, named, and colored according to the number of associated surfaces Free edge(red) Non-manifold edge (yellow) Associated with only 1 surface Associated with 3 or more Surfaces with a free edge between Surfaces them are not equivalenced at that Example: surfaces forming a T Surfaces are equivalenced Shared edge(green) Associated with 2 surfaces Surtaces are equivalenced Suppressed edge(blu surfaces are treated as though combined into 1 surface Topology Repair: Viewing topology A Topology display mode is default in the geom cleanup Display and automesh panels Geom: On Of Elems A Can also be accessed via vis opts on Disp page of fsd■ macro menu 012 o default(topology display in only geom cleanup and automesh panels) Mask: Lines Noces 1 Always in component color mode(geom cleanup and automesh panels will not use topology display Surs byedge Ad⊥ Remove 2 Always in topology display mode, even outside the Only Selected geom cleanup and automesh panels 3 Always in topology display mode, with surtace eAI Mesh shading added oGeom a vis opts in the geom cleanup panel has control of Wireframe Vs shaded display of surfaces □ free edges F口 shared edge Visibility of free, shared, non-manifold, and suppressed N■ suppressed edges edges, and of fixed points F□ nonmanifold edge 厂 fixed goint Topology Repair: What is it? HyperMesh will try to properly clean up surfaces during import Some types of geometry files have surface connectivity nformation which helps hyper Mesh Geometry usually imports cleanly a Topology Repair consists of correcting connectivity errors between adjacent surfaces Possible errors include Unconnected adjacent surfaces Duplicate si ISsing surfaces Goal is to restore the surface data to a good representation of the part

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