morris9791
I understand where you are coming from! It gets my head doing in when I hear budgetary constraints especially when it comes to getting the right analysis tools.
"..We do not incorporate the Ramberg-Osgoods cyclic material equation to calculate strain amplitude.." Care to exlain then...
@vortexman,
I understand how "passonate" you are about 'convincing' others of your understanding of 'circulation theory', however, I think it is not out of place for anybody to raise their own view point on the matter especially in a forum such as this. And just to clarify that I actally studied...
@morris9791,
"..Our spreadsheet does not calculate fatigue for the different types of cycle regimes etc..." Sorry I did not get what you mean here.Did you mean to say that your Fatigue spreadsheet does not use a cyclic load history when estimating the fatigue life of your component? I would...
@rb1957.Sorry I asked that question 'cos I remember doing some wing tunnel experiment some yars ago using 3D wing and one of the things we were hoping to observe was this 100% chord wise circulation and we also wanted to know how far off the "circulation flow field" was from the chord line of...
Hi ya Eddie,
Sorry if my last post seems to convey wrong impression about nCode. That wasnt what I actually intended, as I only wantd you to understand that you should be prepared to do abit more work on the package. Beside, nCode are quite helpful with onsite assistance in configurations to...
@IR, vortexman & rb1957, how does this 100% chordwise circulation playout during take off and/or landing of an aircraft when the slats and flaps are fully deployed. Take for example during take off the flap is fully extended, and there would be a certain 'gap' between the leading edge of the the...
Just curious, has any one observed this circulation phenomenon in a closed lop wind tunnel either using "white smoke" or "white bubbles" instead of air? And for those that have, how far the chord length does the circulation go? Does the circulation go around the wing and if this is the case how...
@rb1957,
I thought tapered planform was a compromise between aerodynamic efficiency and structural (i.e. weight)penalty? at least that was what we were told some years ago in our aerodynamic lectures!
As for the source of lift being justified through the circulation theory, do we agree that C...
What scale option did you use when you were importing the geometry?
And as already pointed out, this would result in silver linings in your final model and this may cause problems during the time of meshing.
What not scale it up in your CAD environment and then import the geometry as *stp file...
You have to be more specific on the FEA tool/software you are using as the options available varies from one software to another.
But generally I would have thought your first step would have been to check the user manual of the software your are using and I am sure it will give you details on...
With your background in structural designs/analysis, I think your best would be to become a stress man. Mind you very few companies today want the old school stress man that does the old handcal in a whitey rules paper! Many are now after Analysis Engineers which is like stress guys with very...
I guess you can contact the guys that owns the software ncode here :http://www.ncode.com/
For all I know, ncode isnt a new software for fatigue,as it has being around for some time now as a standalone product, however many companies found it difficult to integrate into their existing suites of...
Hello Vortexman,
sorry I was refering to the spanwise lift distribution of tapered planform.
If I may ask which Johnson are you refering to? the C. Johnson or the A.D. Johnson (the popular aerodynamis text author?)
I did ask that question because C. Johnson justified his circulation theory...
Vortexman,
while I appreciate your comments on Johnson's theory, in section of your comment below on the effect of the spanwise component of vorticity on circulation;
"... Circulation, which is the line integral of velocity around a closed curve that encircles the wing, would be affected by the...
May I ask how you are achieving your twist using the composite lay-up i.e. Stretch-twist or Bend-Twist coupling? And are you using the propeller-skin or an embedded box?
Besides what you are trying to do requires a fluid-structure interaction analysis where you would have to couple both your...
