Fuselage modelling techniques
Fuselage modelling techniques
(OP)
I want to build a CAD model of a fuselage and have been playing around with some success, but I have 'gone in blind' and am not sure whether the technique I am using is
the best or commonly used.
Is there a preferred method to model the shape of a fuselage?
Some additional info: The fuselage is to have a double bubble design with the fuselage ending in a sharp trailing edge.
I will also appreciate it if someone can refer me to any literature with instructions in this regard.
PS: I know my question is broad, but that is really the idea. I am looking for advice on fuselage (and aero) modelling in general, not just for the specific example I mentioned.
Thank you in advance
michael
the best or commonly used.
Is there a preferred method to model the shape of a fuselage?
Some additional info: The fuselage is to have a double bubble design with the fuselage ending in a sharp trailing edge.
I will also appreciate it if someone can refer me to any literature with instructions in this regard.
PS: I know my question is broad, but that is really the idea. I am looking for advice on fuselage (and aero) modelling in general, not just for the specific example I mentioned.
Thank you in advance
michael
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RE: Fuselage modelling techniques
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Fuselage modelling techniques
Purposes for FE modelling of airframes:
1. To obtain internal loads for design purposes.
2. To obtain detailed stress / strain distributions in airframe components for fatigue and damage tolerance analysis
3. For vibration and aeroelastic analysis.
Each requires specific elements suitable for the task as well as the fineness of the mesh.
I presume that you are looking at case 1 above. Usually the mesh is coarser and coincides with the structural members (ribs, frames, skin panels).
In a pressurised fuselage the skin panels would be modelled using membrane elements, the frames using bars, the stringers using rods or bars. For substantial frames or bulkheads the flanges are often modelled using bars or rods for the flanges and shear panels for the webs.
Regards,
Andries
RE: Fuselage modelling techniques
Andries. My question was more in terms of general CAD modelling (solid modelling) than in terms of FE modelling, sorry if my question was not clear on that.
BUT, I do plan on going into the structural analyses of the fuselage so your reply will certainly help me in the future! Than you very much for that
Kindest regards
michael
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Here's looking at you, looking at me, looking at you
RE: Fuselage modelling techniques
However, it is not easy to produce high quality surface models. It requires a high level of skill and experience. There are very few guys that are good at this work, and they get paid quite well. This is one of those skills that is not easy to teach, and can only be developed thru experience.
RE: Fuselage modelling techniques
"On the human scale, the laws of Newtonian Physics are non-negotiable"
RE: Fuselage modelling techniques
When creating a CAD surface model that will be meshed for some FE application, you should try to avoid thin sections or tiny features that are smaller than the minimum element size used in the FE mesh. They will cause all sorts of problems with the FEA that will need to be fixed manually. Normally, these tiny elements are too small to have an effect on the FEA results. So they should be removed wherever possible.