import files into patran

[Ale22pic]

Hi, I've been looking for some of the website discussions, but I haven't found anything that could help me. Besides I don't know how it works in this forum because it's the first time I write, so if there was a need to make a presentation I apologize in advance because I don't know where to do it. If there was already a discussion that answers my question you can make me present.
My problem is that I designed a frame on solidworks, which is composed of parts that I assembled. I am trying to import everything on patran in order to make a mesh and make a topological optimization with nastran but at the moment in which amount the geometry patran me la riscala, then for example a side in solidworks is 34 mm long and in patran me I find it 13 mm. What do you think is wrong?
thanks in advance for the help!

 

[Onda]

the presentation you can do directly here, who you are, what you do.. etc.
the scale factor you say is strange, sure it's not 25.4?! is a classic draw in mm and import into inches, so 340mm would be 13.38 inches

 

[Ale22pic]

the presentation you can do directly here, who you are, what you do.. etc.
the scale factor you say is strange, sure it's not 25.4?! is a classic draw in mm and import into inches, so 340mm would be 13.38 inches

hello wave, thank you for the answer. for the presentation I then take the time to do it now. My name is alessio, I am 23 years old and I am a masterful aerospace engineering student who is specializing in the aircraft industry.
back to the problem I have now rechecked and in fact it is just as you say, a side of 340 mm becomes me 13.38, that at this point I deduce are inches. At this point I understand that I can continue the accounts by considering thumbs or not? I also wondered if it was advantageous to import the whole frame or maybe do a studio by importing part by side? because the parts of the frame are connected with screws so maybe in patran I could represent them with rbe. However, if you could give me a tip on how to deal with the problem, I'd be grateful.

 

[Onda]

You could also work in thumbs, but I strongly disagree. nastran does not provide measuring units for which your units must be congruent,
means, that if you use thumbs, you must then scale, loads, pressures, etc. in a corresponding way,
much easier to go into import options, which open before clicking on import, and set the unit in mm.
then remember that the forces go n, the pressures in mpa (n/mm^2). the masses in tons and accelerations in mm/s^2,
I'm not a topological expert. As far as I know, you start from a very coarse model, meshato to solid elements, and then the topological maintains the useful volume of the material, depending on a set of load houses. if you start from a already defined geometry there is little to optimize. I would try to start from a simple base, so certainly less possible components, with a thick solid mesh, possibly regular. and then you have to let the program do.