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No rating yet Subject: Re: optimization problem Author: Muralidhara D. N muralidhara.d@ Date: 2002-06-05 03:55:00Hi Rick
If the model is created in pro/e sheet metal option,then there is no problem in getting the surfaces into ansys and meshing by shell elemnts,there by toggling with real constant values,we can arrive at an optimum thickness with in the specified limits of stress and deflection.
But if we have a casting model of irregular geometry,modeled in proe,imported to ansys with volumes ,meshed with tetrahedral elements(10 noded solid 92 elements), and then if i want to optmize the component for range of stress, how do i proceede in this case??
Thanks in advance Murali -----Original Message----- Sent: Monday, June 03, 2002 7:25 PM To: xansys@yahoogroups.com
If your part was created in the sheet metal module. the midplane is generated automatically. This is true also for parts made by shelling, and there may be others. This functionality is found under Mechanica, Structure, Model, Idealizations, Shells, Midsurfaces, Autodetect. If the part is just thin 3-D geometry that looks like sheet metal, them the midsurface is generated by manually "pairing" faces to collapse to the midplane. This is done with Mechanica, Structure, Model, Idealizations, Shells, Midsurfaces, New. This functionality used to be part of ProMesh. ProMesh is gone, and the functionality has been buried in Mechanica to force you to buy Mechanica, even it you use Ansys. But, existing ProMesh customers were had their seats grandfathered in, at least for a while, so you might have it available. We lost Promesh when we went to Pro2001, but I'm not sure if that was because ProMesh went away, or if it was an oversight by the CAD administrator.
Rick Fischer Marconi
mark.hommel@u... on 06/03/2002 08:26:13 AM
To: xansys@yahoogroups.com cc:
Murali, How did you import the Pro/E model as a mid-surface shell model into ANSYS? Was it a 3-D model to begin with? My Pro/E experts over here haven't figured out how to do that yet. Mark Hommel, P.E., Ph.D. Senior Engineer ABB Offshore Systems Inc. Houston, TX
|(Embedded | |image moved | |to file: | |pic00214.pcx)|
|Markus Lengauer
|06/03/2002 06:37 AM
To: xansys@yahoogroups.com cc: (bcc: Mark Hommel/USOFS/ABB)
If the only geometric parameter to be changed is the sheet thickness, then you just have to define the thickness value in the real constant sets for the shell elements as optimization variables.
You have to define different real constant sets for each shell element or for each section, if preferred. Otherwise the whole model will be optimized for a unique thickness.
The creation of the real sets should be performed via *DO Loop after meshing with a dummy real set.
Regards, Markus
Muralidhara D. N wrote:
>Hi Ansys users
>I have a sheet metal component of 1.8mm thick and the cad model is >imported from >pro/e to ansys as mid surface.i have done the static analysis for the >component and >the stress levels are much well with in the yeild stress for the >material.
>now i want to do the optimization for the component keeping stress and >deflections as >variables, and then optimizing the sheet thickness.
>now my problem is, how do i defeine these variable while doing >optimization??because, i have'nt >done the geometric modeling in ansys using parameters.
>could any one let me know regarding this.
>Murali >HCL Tech >Blore >muralidhara.d@s...
Dipl.-Ing. Markus Lengauer - Technische Berechnung Studiengang Fahrzeugtechnik / Automotive Engineering FH JOANNEUM Gesellschaft mbH Alte Post Strasse 149, A-8020 Graz Tel.: 0043 (0)316 5453 8413 Fax: 0043 (0)316 5453 8401 e-mail: markus.lengauer@f... visit our homepage: www.fh-joanneum.at