Hi
regulation require fireproof (15min @ 2000f) lines and fittings in designated firezones (engine compartment). Does anyone knows if aluminum alloy fittings are accepted by the FAA?
Thanks for info!
Rob
Is it possible to define loads af a function of the deformation of the model? In my case I need to model gyroscopic loads of the propeller on the enginemount.
The loads are dependent of the angular velocity of the deformation, and are directed in a 90 deg. phase to the deformation.
I use a concentrated mass (conm2) in my patran model. I use the lumped option. Now I have to fill in:
-mass (no problem)
-mass orientation ( is that the orientation of the gravity vector?)
- Inertia 1,1 1,2 etc. Is I(1,1)=Ixx, I(2,2)=Iyy, I(3,3)=Izz
Could someone please help me with de mass...
Thanx for your replies!
I was somewhat unclear about the elements I use. I started out with beam element, but I got the tip to use rods, because the tubes in the structure are basically not designed to carry lateral loads. What will be the differences in a static and normal modes analysis?
Most of the time I get the following messsage in my nastran (.f06) output file : (edited)
*** USER INFORMATION MESSAGE 4114 (OUTPX2)
DATA BLOCK GEOM2S WRITTEN ON FORTRAN UNIT 12, TRL =
(MAXIMUM POSSIBLE FORTRAN RECORD SIZE = 16386 WORDS.)
(MAXIMUM SIZE OF FORTRAN RECORDS WRITTEN =...
I have to model a truss and perform a dynamic a analysis in nastran/patran. Since the real structure is built from metal tubes welded together, I will use bar-elements for (almost) all structural elements.
My question: Does it make any difference whether I use one bar-element for an entire...
