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Rahul R

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Everything posted by Rahul R

  1. Hi, Unfortunately there aren't any commands yet for auto fixing intersections or penetrations. All you can do so far is to use the tools in the penetrations panel interactively. Regards Rahul R
  2. Hi, In 13.0, we have the upgraded hm_collision* APIs. It has the features to detect the vector and depth of penetration area.Here is a sample model and Tcl script that shows how to use these APIs and get the relevant data. Regards Rahul R Penetration.zip
  3. Hi, Even you can try with below initial velocity. /INIVEL/AXIS - Initial velocities for translating and rotating components Regrads Rahul R
  4. Hi, Could you share more information on your project like what type of contact interface you defined? Hope you would have applied some load along with gravitational load because in Radios we cannot run job only with gravity load. Imposed displacement along with rotational Dof along incline plane with Type7 contact should work. If possible please share your model through FTP file transfer. Regards Rahul R https://ftam1.altair.com/filedrop/rahul.rajan@altair.com
  5. Hi, Please find attached deck and doc for modal analysis using superelement.Please go through that and let us know your feedback. Regards Rahul R Dynamic_Reduction_CMS_SE.pdf CMS.zip
  6. Hi, Use linear interpolation method: Analysis >> Pressures >> Linear interpolation (By default the option is set to constant, magnitude, use the drop down button to get other options) Create pressure on one element of one magnitude (10MPa) and then a larger magnitude at the end of the component (100MPa) HM will interpolate between the two loads. See attached video file. Regards Rahul R New folder.zip
  7. Hi, If you want to deafature or convert solid fillets to sharp corner.you can use solid Thinking Inspire CAD cleanup tool for converting solid fillet in to sharp corner.Inspire can easily close cylinder , fill patches and remove logos. After cleanup you can export as stp or igs file and import back in hypermesh for Hexmeshing. Solid Thinking Inspire tool is meant for Design Engineers who can do quick topology optization and to validate optimized design one can do static and modal analysis.Inspire is also the Hyperworks tool. Regards Rahul R
  8. Hi, Please find below answers to your query. 1.It uses Simlab for meshing in the backend when you submit run in Inspire. 2.In Inspire we just provide element size for static and modal run / min member size for optimization.Simlab default take care of element quality called stretch criteria for tetrahedral element (refer attached thumbnail ) Inspire generated fem file if you import in Hypermesh and invoke one card PARAM checkel set to No , then Optistruct solver will run without error. Basically Inspire is a tool meant for Design Engineer who don't want to spend time for meshing/ quality check and do quick topology optimization, validation optimized part using static and modal analysis. Hence Simlab default take care of element quality based on geometry complexity.If part is having complex feature and simlab fails to generate mesh then you could use geometry cleanup option to overcome such complex feature for meshing. Hence in Inspire we have envoked some best default card for Optistruct solver for smooth run.You can cross check the same in Inspire generated .fem file (PARAM chekel Card use). 3. If you want to use Inspire for commercial purpose please contact your region Hyperworks support. Regards Rahul R
  9. Rahul R

    nvh

    Hi, Please find attached transfer path analysis user guide for Altair Optistruct solver.Please go through that and let us know your feedback. Regards Rahul R Transfer Path Analysis on an Automobile.pdf
  10. Hi, Please define property for the same Rbody. Regards Rahul R
  11. Hi, If You can share your requirement in detail ,it would be nice. We can direct you to use appropriate Hyperworks tool which will meet your requirement. Regards Rahul R
  12. Hi, In Radioss we should not provide any material and property to Rigid element(Rbody). If you are considering any component and part as rigid then assign MAT1 cards and provide linear elastic property like E, NU & RHo. Regards Rahul R
  13. Hi, The best is to use /MAT/LAW65 in Radioss. It’s nonlinear elastic with hystheresis, strain rate dependent, you may also define a plastic region if needed. It is only compatible with shell elements. There is also a LAW71, specially developed for NItinol with shape memory, but this one is not very stable actually and I would not recommend it.Hence the good choice is Law65 and I would like to add that law71 is Linear elastic before reaching the yld stress transformation. Regards Rahul R
  14. Hi, I have attached pdf for Hmcollision check. Regards Rahul R hm_collision.pdf
  15. Hi, You can use Simlab for 3d meshing .It mesh the part based on feature.This tool is also a part of Hyperworks suite from Hyperworks desktop 12.110. Identifying such feature like fillets, cylinder ,four side faces is very easy in simlab.Let me know if you need any help wrt to simlab.(Its easy to learn and robust tool for tetrameshing) Attached Screenshot is your reference. Regards Rahul R
  16. Hi, You can apply pressure on solid element using Pload4 card for Optistruct solver.Select element and define nodes on face of phase where you want to apply load. Even you convert pressure loading to force and applying using same rigid concept.Please refer attached thumbnail. Regards Rahul R
  17. Hi, Sorry for late reply. If you have frequency dependent dynamic load. You an use Tabled1 card to insert your loading. If loading is in the form of force use DAREA card, or if it is in the form of velocity acceleration or displacement used SPCD card. There are multiple ways to input damping to a structure. The two types of damping which are generally used in linear-elastic materials are, 1. Viscous damping 2. Structural damping The viscous damping force is proportional to velocity, and the structural damping force is proportional to displacement. Which type to use depends on the physics of the energy dissipation mechanism(s) and is sometimes dictated by regulatory standards. Structural damping is specified on the MATi and PARAM,G, GFL Bulk Data entries. The GE field on the MATi entry is used to specify overall structural damping for the elements that reference this material entry. This definition is via the structural damping coefficient GE. An alternate method for defining structural damping is through PARAM,G. This parameter multiplies the stiffness matrix to obtain the structural damping matrix. The default value for PARAM,G is 0.0. The default value causes this source of structural damping to be ignored WTMASS Converts weights to masses using this multiplier. REAL > 0.0 Default = 1.0 Parameter Values Description WTMASS Real > 0.0 Default = 1.0 The WTMASS (Weight-To-MASS) parameter is used as a multiplier for the terms of the structural mass matrix. Note: PARAM, WTMASS cannot be applied to superelements (.h3d or .pch) that are read into the model. If the unit of mass is incorrect on the MAT# entries and PARAM, WTMASS is required to update the structural mass matrix; then this should be done in the creation run. Hope it helps. Regards Rahul R
  18. Hi, Could you share us the screenshot of output in HV and screenshot of model with loads and boundary condition? Regards Rahul R
  19. Hi, These are the inputs required to carryout thermal structural analysis using Optistruct solver. Heat flux load QBDY1 and convective heat transfer CONV are applied to the structure through surfaces identified by the CHBDYE card. The CHBDYE elements associate heat exchange surfaces with conduction elements.For Detailed information please refer Optistrcut usre guide. Let us know if want us to share any material wrt to thermal analysis. Regards Rahul R
  20. Hi, what is your material and property? do you use /QUAD or /SHELL elements? /QUAD s are applicable only for 2D problems. Regards Rahul R
  21. Hi, The above behaviour of showing one symbol of constraint for selected face is intended behaviour.In Hypermesh Optistruct user profile this happens when you apply loads on geometry. Once you submit job it will map that contstraint to all nodes associated to constrained surface. Regards Rahul R
  22. Hi, 1.If model having curvature and uneven phase.please use normal option.If pressure applying region is in one plane use vector option.But in your case you use normal option. 2.Pload4 type is used for hexa penta tetra quad and tria element. Pload is for only quad and tria. Pload1 for Bar and beam element. Refer Optistruct solver user guide for detailed information. Regards Rahul R
  23. Thanks for sharing youtube link for your requirement.We will get back to you. Regards Rahul R
  24. Rahul R

    meshing

    Hi, In Hypermesh we have some colour terminology to represent CAD geometry. 1.Red colour indicates free egdes.It could be missing surface ,overlapping surfaces or unconnected surface etc. You can use geometry page:quick edit(filler surface,toggle edge) or edge edit: replace or equivalence command to correct geometry. 2.Green colour represent shared edges(surfaces are sharing at junction) 3.Yellow colour for t juction for mid surface part 4.Blue dotted line for supressed edge. We recommend you to go through some geometry cleanup tutorial to correct the above geometry.Once the geometry is enclosed with green colour it will be ready for 3D tetramesh(volume tera,automatic method)for meshing you can refer 3D meshing tutorial. Regards Rahul R
  25. Hi, Could you explain your requirement in detail? what i understood from your query is you want to highlight internal parts in assembly. For highlighting such parts you can use transparency option. Correct me if am wrong. Regards Rahul R
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