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bmech

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Everything posted by bmech

  1. Thanks for the files. I tried on the 2017 version and works fine as expected Regards
  2. Thanks I started to make the exercise. Maybe you could help me. At the end of the free-size optimization, when I import the results of my analysis my plies are named in different way: 1102,1201,1202....5401...5418 instead of 110100,11200 ecc with the results that I have 216 plies instead of 25 of the tutorials. Any suggestion? Regards
  3. Hi Where I can find the files for the tutorials: "Composite Optimization with Optistruct 11.0 on the example of a Formula Student Monocoque" and "Composite Optimization with Optistruct of a Snowboard" Regards
  4. bmech

    Damping

    Thanks, I did the same thing. It's really dangerous thing, this means that if you want use SDAMPING only for a specific range, you can't use param,G for the others. Or if you have different loadcase you have to define SDAMPING for each loadcase
  5. bmech

    Damping

    the analysis is a modal frequency response. SDAMPING is applied for a certain range of frequencies. So in this range is considered only SDAMPING or is added/considered the parameter G? Regards
  6. bmech

    Damping

    Hi If is apPlied SDAMPING (no CRIT) as law with a value of 0.08 in a certain range only and param, G 0.08...what happens? in the defined range of frequency is considerend only SDAMPING or G. Regards
  7. bmech

    MFLUID

    If I want define a more complex surf (without use zfs)? For example a cycler with a piston (so the volume of fluid is the volume of the cylinder minus the volume of the piston)? Thank
  8. bmech

    MFLUID

    done, perfect, and the freq goes down. Thanks
  9. bmech

    MFLUID

    Thanks, I'll check it
  10. bmech

    MFLUID

    Any model available? Thanks
  11. bmech

    MFLUID

    Is there any tutorials or reference exercise in order to learn MFLUID in optistruct for modal analysis? Regards
  12. Are available tutorials in order to generate a flexible body model for example of an assembly using component mode synthesiswith frequency content?
  13. I'd like to perform a PSD analysis using NCODE. I have performed a modal FRF using Optistruct but in NCODE is not able to consider the results as FRF. Do you know why?
  14. Sorry for the late, fortunately I resolved the problem. The model works fine Regards
  15. Dear I have an assembly that I have decided to divide into 5 subassembly (A,B,C,D,E) Using Craig-Bampton method, each of this assembly has been condensed (h3ddmig but I have tried with .pch also) using only the visualization of plot elements (plotel3 and 4) In the master model, the residual nodes (aset) of each assembly are connected each other using beam and rod with different dof (in order to simulate a mechanism) and a rigid with the master node grounded and I asked for a certain number of modes (normal modes). NO ERROR in the output file but neither results (h3d) but a serie of OSxxxx_er.rs~ This is the what i have in the output: Lanczos solver warnings for eigenvalue subcase 1. - At some point in the process, an inconsistent inertial count was found. This implies that some of the calculated frequencies may be inaccurate, especially the duplicated frequencies. To avoid this, specify both bounds and keep the bound away from the currently calculated frequencies. *** warning *** the rayleigh quotient x'kx / x'mx for the 1-th eigenvector does not match the computed eigenvalue lambda ( 1): -9.86447590101136D-06 x' k x : 5.21843506993811D-05 x' m x : 1.00000000000000D+00 discrepancy : 6.20488266003924D-05 *** warning *** the rayleigh quotient x'kx / x'mx for the 2-th eigenvector does not match the computed eigenvalue lambda ( 2): 4.00771124962063D-05 x' k x : 7.34242225598191D-05 x' m x : 1.00000000000000D+00 discrepancy : 3.33471100636129D-05 *** warning *** the rayleigh quotient x'kx / x'mx for the 3-th eigenvector does not match the computed eigenvalue lambda ( 3): 5.23449252423092D-05 x' k x : 1.36220146252925D-04 x' m x : 1.00000000000000D+00 discrepancy : 8.38752210106160D-05 eigenvalues and eigenvector residuals ------------------------------------- eigenvalues norm of estimated (radian/sec)**2 residual accuracy --------------- -------- --------- -9.86447590101136D-06 2.4225D-06 2.4225D-06 4.00771124962063D-05 1.2132D-06 1.2132D-06 5.23449252423092D-05 3.9402D-07 3.9402D-07 *** Warning for eigenvalue subcase 1 Number of modes requested = 3 (0 = all) Number of modes found = 3 warning status index = 10 maximum relative discrepancy = 0.83875E-04 (Scratch disk space usage for starting iteration = 1 MB) Any suggestion? Regards
  16. What type of approach do you suggest?
  17. Unfortunately I can use only tetra elements. But it's not really clear for me or to define the laminate in MAT9
  18. Hi I have a complex geometry, with some parts made of "solidcarbon" where i can only use a tetramesh or solid mesh (no solid layer). How can i define the laminate for this tetramesh parts? I have only to create an equivalent orthotropic material with hyperlaminate and use a MAT9? Or Is it possible define the laminate and to have a poor evaluation of the stress in each ply? Regards
  19. Dear, I don't know why, probably it's a stupid thing but I'm not able anymore to use the wheel on the mouse in order to zoom. This problem is only for Hyperview, in Hypermesh works absolutely fine. There is any type of option that I don't know? Regards Bruno
  20. Thanks George, I know 1mN-mm is 0.001 N-mm but I don't know how to reconvert manually the .pch file? Do i need to change the value for any single KGBOX manually? Example mN-mm DMIG* KGBOX 12522 2 * 12521 1 6.307481517E+04 * 12521 2-1.745010826E+04 * 12521 3 1.500132835E+05 * 12521 4-8.455473220E+06 * 12521 5-1.979675434E+06 * 12521 6-1.243141111E+06 * 12522 1-1.561769361E+09 * 12522 2 3.627508327E+08 * 12522 3-1.243141111E+09 * 12522 4-1.979675434E+10 * 12522 5 4.110513817E+11 I wanto to change in N-mm. I have to change manually the values? Regards Any idea? Regards
  21. Thanks George, I know 1mN-mm is 0.001 N-mm but I don't know how to reconvert manually the .pch file? Do i need to change the value for any single KGBOX manually? Example mN-mm DMIG* KGBOX 12522 2 * 12521 1 6.307481517E+04 * 12521 2-1.745010826E+04 * 12521 3 1.500132835E+05 * 12521 4-8.455473220E+06 * 12521 5-1.979675434E+06 * 12521 6-1.243141111E+06 * 12522 1-1.561769361E+09 * 12522 2 3.627508327E+08 * 12522 3-1.243141111E+09 * 12522 4-1.979675434E+10 * 12522 5 4.110513817E+11 I wanto to change in N-mm. I have to change manually the values? Regards
  22. How to do? I have an .txt and .pch I want to change from mN-mm to N-mm Regards
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