Report hyper mesh


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Report hyper mesh

  1. 1. Report OnMeshing a mechanical component in Hyper Mesh By P Venkat Vijay Kumar 09101291 Section 3A Roll No. 18 Mechanical Engineering Department KLUniversity 1
  2. 2. Machines have played a crucial role in transformation of man’s life. But many crucialcomponents make a machine. Therefore for effective simulation of machines and their working,meshing the components plays an importantrole.Transfer of rotary motion from one shaft toanother is widely needed task to be able toutilize machinery. Suppose a portable generatordriven by a four stroke single cylinder engine.The rotary motion of flywheel of the engine hasto be transferred to the generator so that itgenerates power in another form. Thuscouplings play an important role in machines.A knuckle joint is used to connect the two rods which are under the torsion load, when there isrequirement of small amount of flexibility or angular moment is necessary. There is always axialor linear line of action of load. Parts of a knuckle joint are Fork end rod Eye end rod Collar Pin Tapper pinOut of all the parts mentioned fork end rod isa bit more complex, when compared to therest of them. Therefore meshing of the forkend of rod is demonstrated.Here are some views of the fork endcomponent, drawn and generated in Catia.CATIA (Computer Aided Three-dimensionalInteractive Application) is a multi-platform CAD/CAM/CAE commercial softwaresuite developed by the Frenchcompany Dassault Systemes. Written in 2
  3. 3. the C++ programming language, CATIA is thecornerstone of the DassaultSystemes product lifecyclemanagement software suite.The component is generated by initiallyprojecting in sketcher and drawing it into 3d.Actually any component is drawn that way.Following are commands used. Pad Pocket Grove Edge fillet Circular arrayNow generated component is to be exported to Hyper Mesh for further steps. If you have theCatia license in Hyper Mesh the geometry can be directly imported from Hyper Mesh importoption. If not the file generated in Catia as ‘*.catpart’ is converted into ‘*.iges’ and thenimported in HM.Hyper MeshIn Hyper Mesh the part is imported from selecting import option from the tool bar or ‘file > import > geometry’ and select the component from its location. Once the component is imported the model browser shows the components as (1). Edge check and geometry clean up The first step should be check of unclosed edges and volumes along with any errors in the geometry. The icon ‘visualization option’ is selected from the Commands panel toolbars that opens the visualization page. This page contains several colors showing edges. If there are no free edges and all are shared edges the task here is done. Usually using the current day software suites such as Catia, ProE lets us get the exact shape without any data loss while 3
  4. 4. converting.If any of errors found they are corrected by suppressing, equivalencing and redrawing certainplanes, surfaces, edges or points.Some shapes may not be defined well at a required level they have to be readdressed by HyperMesh. Autocleanup option in the geometry page is enough to complete cleanup of all surfaces.All the surfaces are selected and autocleaned with given parameters.Any more changes are done through the options available such as Quickedit, Edgeedit,Pointedit, Solidedit, Surfaceedit, Defeature etc.MeshingMesh generation is one of the most critical aspects of engineering simulation. A clean meshwith appropriate densities has several advantages. If a load has to be applied over a region no.of nodes there has to be known, a regular meshhelps. And near the intricate regions higherdensities of elements would make the resultsmuch better approximation.Keeping the above mentioned in view we meshthe component in two steps. In the first step wemesh the surfaces and in second step, the volumeis meshed with reference to the nodes and elements formed from surface meshing.First of all, the surfaces where there would be necessity of connecting, acted upon by loads areto be meshed with as much regularity as possible. Selecting the inner surfaces of the circularhole, a provision for pin is apt one here. Therefore the two surfaces are selected and meshed from the panel shown in the figure.Then each and every surface is selected individually and meshed using the same panel. Bymeshing it individually we can control the quality of the mesh as needed. It is always better tosave meshed elements into a new component so that 2D elements can be deleted afterwards.Now the quality of the 2D mesh is to be checked and corrected to possible extent. The imageshows quality index of the 2D mesh. The red elements are badly out of shape so they have tobe rebuilt or no. of nodes has to be increased or moved. 4
  5. 5. Now 2D elements are meshed into 3D form. Tetramesh option is found in 3D page and thatoption is used to generate 3D elements. All the elements are selected and meshed into tetraform.Quality checking of the meshNow we have got the solid 3D tetra mesh. This can be checked by masking few elements andsee the other elements. Mask option is found inthe tools page. Select some elements by windowand mask them. To get back the elementsunmasking all is the option. Thus the entirecomponent volume is meshed. But now we don’tknow whether each element generated is perfect.The options ‘check elems’ in tools page comeshandy here. Set the mode as 3D. And you can seethe following page.Warpage 0% Failed Equia skew 9% FailedAspect 0% Failed Vol skew 9% FailedSkew 0% Failed Vol AR 1% FailedTetcollapse 13% Failed Tria Faces min 1% FailedCell Squish 3% Failed Tria Faces max1% FailedLength 0% Failed Quad faces min 0% FailedJacobian 1% Failed Quad faces max 0% Failed 5