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  1. hello im triying to do a topography optimizaiton using ERP as a response, and a minmax objective. when i try to solve it i got the following error: *** ERROR # 2148 *** Invalid design problem. All the sensitivities of response 1 (objective) are zero.
  2. hello everyone, i want to do an optimization in order to increase the correlation between experimantal results and numerical ones, using MAC cretria, my design variables are the stifness of the damping springs. my size optimization is well set it works but i don't know how can i connect the expermental result that i have in an .UNV file and the numerical results. to say to optistruct i want to increase the mac between the two. i know that i have to use the parameter TRAKMETH MODETRACK MFILTER. but i don't know the right steps to operate this one. if you have some ideas i will be greatful thanks.
  3. hello, i'm doing a size optimization in order to match the drequencies targets for the first 10 modes. so i defined my design variable wich is the PBUSH stifness k1..k6 and as and objective is the MIn using DSYSID (iwth all the 10 first frequancies and the targets) but some how i don't have the right results thats i want i have in my model DESVAR refered to stifness of PBUSH DVPREL1 DRESP1 MIN WITH a DSYSID everythings is well defined i don"t if there something else to add to my optimization to work
  4. hello, i want to define a anistripic material in optistruct and i don't know what card image should be used for such a material. thanks
  5. hello, im doing a model correlation between an experimental results stocked in a UNV file, and a numerical simulation run using optistruct while loading both results from the UNV file and the h3d i have a message the said << Node block 2411 or 15 or 781 does not exist >>. this error comes from the UNV file and i don't know how to fix it. thank you for your help!
  6. thank for your reply but it did not work for me this method because it can't find any equivalence, but if found a solution instead of doing a 2d automesh and a 3d tetra after that i have used multi solid mapp mesh i thing the probleme i causes by having more than one solid to mesh so passing by solid map solves the probleme even if it takes some time becaus the geometry needs to be trimed thank you once again!
  7. hello, i'm trying to do a correlation between experimental results and numérical ones, so for this correlation i am using as a reference file a .UNV ( 164) and for correlation file results extracted from a modale analysis optistruct, so once i clic on load an error message apear it said that '' erreur: missing operand ar_@_ in expression..'' as showing in the picture. i'm sure that the error comes from the unv file. so my question is : is it the unv fomat file ''dataset 164'' that causes this error? if yes what dataset should be used ' dataset 15, 18, 55, 58, 82 or 151? if there is any other suggestion i'm all ears. and thank you in advance for all your replies
  8. hello, i have a problem with meshing a solid. first i have one solid which i have extruded to have two solid linked together (the surf between the two is yelow) before launching 2D mesh my geometrie have no free edges. after 2d meshing i see that a free edge was created in the intersection of the two surfaces of the solids. i tried to use the tool equivalence but it's not working. with the free edge created i cannot proceed to do a tetra mesh. if anyone have a solution i'll be grateful and thank you for your help,
  9. hello, i'm triying to to find a solution of a probleme i'v acoutred in the last few days, i'v exported from ANSYS a .cdb, file which i opened with hypermesh and while i'm on the Ansys user profiles every thing seems ok, i got all material propreties, geometri propreties, DOF... but the memont i pass from Ansys user profile to optistruct i lose all my data (no materials defined...), i got only the initial geometry. so i got three questions if anny one got the answers i'll be realy greatfull. 1) is there a way to keep all my imputs when i change the user profiles from Ansys to optistruct ?. 2) how can i define the following matairial propreties using optistruct?: * thermal expansion * permeability * resistivity (constant) * specific heat * thermal conductivity 3) how can i also define a COMBIN14 element type using optistruct? and thank you everyone
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