How to build a complete fuselage loads FEM for a helicotper and correlate with FLS data
How to build a complete fuselage loads FEM for a helicotper and correlate with FLS data
(OP)
Dear Experts,
I looking for some guidance. Recently I have complete flight loads survey data on a helicopter. But still no loads FEM.
I plan build a loads FEM, any suggestions on how to build one? I can model many things, but could use some guidance.
Also how to apply inertia loads or loads from FLS data and correlate to FLS data?
I thank you much,BR,
KS.
I looking for some guidance. Recently I have complete flight loads survey data on a helicopter. But still no loads FEM.
I plan build a loads FEM, any suggestions on how to build one? I can model many things, but could use some guidance.
Also how to apply inertia loads or loads from FLS data and correlate to FLS data?
I thank you much,BR,
KS.
RE: How to build a complete fuselage loads FEM for a helicotper and correlate with FLS data
To apply inertia loads you have to model all of the masses, structural and non structural, and apply accelerations.
RE: How to build a complete fuselage loads FEM for a helicotper and correlate with FLS data
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: How to build a complete fuselage loads FEM for a helicotper and correlate with FLS data
FLS data is in load, moment, strain in some point, and accel on high vibrating point.
I allowed to use inertia relief at aircraft CG SUPORT point connected to mast base.
But how to find out which limit loads? What to apply where and then how to validate with FLS data?
RE: How to build a complete fuselage loads FEM for a helicotper and correlate with FLS data
RE: How to build a complete fuselage loads FEM for a helicotper and correlate with FLS data
So that sound like good start.
But FLS data is from many maneuver that include many things, rolling pull out, pushover, turn, dive, pull up etc. not just one direction g load. So how to do it?
TY,
KS.
RE: How to build a complete fuselage loads FEM for a helicotper and correlate with FLS data
RE: How to build a complete fuselage loads FEM for a helicotper and correlate with FLS data
RE: How to build a complete fuselage loads FEM for a helicotper and correlate with FLS data
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: How to build a complete fuselage loads FEM for a helicotper and correlate with FLS data
First, the title says fuselage model, so ignore all of the rotor data; those get analyzed separately.
Second, not sure what you mean by control system, but probably ignore that also, as it will get separate design and analysis.
Third, you need to sort it out for a single fixed time value.
Fourth, get your forces, moments, strains, G’s for a given maneuver and time value.
Then as mentioned above, get the unit load case results at the same locations as the data in step 4.
Then see if there is a single set of 6 factors to apply to the unit load model data so the model matches all of 5he data from step 4.
Repeat for every time value and maneuver.
Probably can be set up in a giant spreadsheet.
RE: How to build a complete fuselage loads FEM for a helicotper and correlate with FLS data
RE: How to build a complete fuselage loads FEM for a helicotper and correlate with FLS data