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Found 5 results

  1. Hello, I'd like to know if there's a way to conclude/cut-off an on-going iteration before it reaches the subcase termination time? I'm running a geometric non-linear explicit dynamic subcase. I want to base this iteration cut-off criteria once the rigid wall reaction force reaches a specific value...This should speed-up my topology optimization considerably... If not then, is there a way to define a constrain on the rigidwall reaction force ? I'm referring to the reaction force that we read from the "T01" file... Thanks !!
  2. I have looked the help, as it mentions the principle. now, if only need to extract the equivalence load from the dynamic analysis, can we do so,and how to do it? thanks!!
  3. Hello, I want to optimize a front end of vehicle and I have built a FE model in radioss block, and I want to use the esl method as the optimization strategy, is there any possible way to couple radioss block files with optistruct to use the esl method? Thank you!
  4. Dear all, I am currently working on a cylinder head optimization using Optistruct. The camshaft induces dynamic loads on the head. I would like to use the ESL method to convert these dynamic loads into static loads, but I can't find any help, or any tutorial on how to do that. Is it while setting the different forces on the head, or do I have to run another analysis?... Do you have any clue? Thanks a lot Best regards Florian
  5. I made a file about topology optimization in RADIOSS. In my file there are two parts naming as “hg” and “sf”, the part “sf” is considered as rigid body. I want to make topology optimization about the part “hg” when there is a concentrated load pushing the part “sf”. First, the implicit simulation is carried out while considering gravity loading of two parts. In order to remove the rigid body modes, the part “sf” is connected to fixed nodes via type 8 spring elements. It outputs an initial state file. Then I made an explicit simulation with a concentrated loading pushing the part “sf”. The explicit simulation includes the initial state file. At the same time, I made a .radopt file including optimization objective, design responses, design constraints. They are achieved through /DESOBJ, /DTPL, /DRESP1, /DONSTR options. When I submitted the .radopt file in OptiStruct, it showed me one error. *** ERROR # 4207 *** /Invalid value in field “DTYP” on card /DTPL # 1. According to the Online Help, there is only one option 1 can be used. And in the .radopt file the field “DTYP” is 1. I don’t know why it shows me the error. Can anyone tell me why? Can the similar topology optimization be achieved through OptiStruct ? I upload the ralated files. Thank you in advance ! grav_exp_os.radopt grav_exp_os_0000.rad grav_exp_os_0001.rad
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