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Found 29 results

  1. Hi , I have following the posts in the forum, this time I have a question regarding a problem I'm facing. I am currently working on bringing several checks we do for a full vehicle in Primer to HM. One of them is the C.O.G of the vehicle and the total scaled mass. I have checked the F10-> Time option and after checking for the set dt2ms value, I'm getting the total added below as shown in the picture. I want to get that value (0.0809878) directly. Is there any method/command for accessing that output displayed there?? I have tried hm_getelemchekbounds and hm_getelemcheckvalues but after that I will required to do a lot of work to get the total added mass. Any suggestions...
  2. I am working on a Hybrid3 Head Model. The geometry I have is a hollow Surface File. I have created a 2D mesh and I want to match the weight of the head by creating a mass at the COM. Please let me know how to do the same. Thank you, Datta
  3. Hello, I'm to optimize an CFRP drive shaft for an formula student race car. The shaft itself is produced in a winding process. The tulips of the homokinetic joints are glued into the ends of the shaft. For that I created a model with a PCOMPP property and a laminate with 4 plies. The tulips are simplified as rod elements with HyperBeam tubesections and PROD properties with characteristical values of aluminium. The measurements are: length of the shaft: ca. 300 mm inner diameter: 65 mm laminate thickness: 8 mm length of the rods: 80 mm inner diameter of the tulips: 45 mm If I run an analysis of the model and check the out.file, the mass is calculated as about 1350g. If I run the free-size optimization afterwards, the mass before the first iteration is calculated as 1270g. I don't understand why the two values aren't the same. Is the calculated mass in the analysis the mass of the tulips and the shaft an the mass before the free-size optimization only the mass of the shaft because of the objective function? I don't really get, why there is a difference. Because the mass of the tulips should be about 600g and not 100g. The objective funktion ist minmass and the contraints are set by the displacement of the nodes of one end of the shaft.
  4. I would like to know if when I do the FRF in OptiStruct the result obtained is normalized by the mass, if it has some other type of normalization or if the result is "pure"?
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