Rasmus,
We need to back up a bit because it sounds like most of our initial responses would come from dealing with the FAA (US). Rb asked who your local authorities were, and your response to that may change the responses that you receive back.
OK, I'll quit the fun at your expense, too, since rb has clearly taken the "high road".
Trusting that you understand the modeling requirements, do you know what the amplitude and frequency of the driving force is? Or are you looking to include the fluid flow calculation into a multi-physical...
So, rb, I should stop my "spinning wing" design?
I'm a former marine guy...let me just say that before you try and transition something from one industry to the next, you have to understand both. I'm not convinced from your many posts in the marine forums that you understand either sufficiently.
rb? A little turrets syndrome? Or am I missing something in your post to warrant your exclamation?
I, too, would question the use of truss element or beam elements. Looks like plate might actually apply unless your members are quite long, which at that depth, they probably are.
I'll chime in...I have a master's in ME and used to run my own FE and design company. I didn't do much in aero at that time, but that experience helped me land this job that I enjoy so much. Funny thing, now that I'm here, I realize that the Atlanta ACO doesn't buy in to FE too much on the...
If you are truly analyzing a plate, you won't be able to validate it with beam bending calculations. If you just modeled a beam with plate elements, that could be different.
Have to agree with Flash on the hand calc...should be simple unless your cross-section is really difficult. Typically...
If you are working on a commercial aircraft and Part 26 is involved, you will have to do a DTA, and the foreshortened pitch will likely result in reduced cycles to failure. Also, with such a short pitch, detection of a crack may not be possible without some significant expense due to the method...
What software are you using because you can also do this in Algor. AMPS allows you to perform the analyses at the same not...you don't have to combine them.
43.13-2B, as I was made ABUNDANTLY aware from AEG, is only applicable to UNPRESSURIZED aircraft UNDER 12,500 pounds, so make sure you "fit" into this category (please read the bitterness in this...long story), but I agree with RB that it is probably a company guideline or a justifyable...
I think for freeware, Calculix may be your only hope, but as JohnHors says...it won't be very easy. www.bconverged.com I believe is the Windows version. www.calculix.com for the original, but the orthotropic nature of the wood may require some playing around with the input files in...
I am not that familiar with generators and am, therefore, unable to advise about idealization of the end windings.
Typically, the engineer will simplify the system to something that is idealized as a series of masses and springs. For a single degree of freedom system, this is a single mass...
Your question is VERY broad. Are you looking to perform the calculations by hand or FEA? Is your system SDOF or MDOF? Are you trying to solve for the fundamental mode or multiple modes? This list goes on. Please be more specific.
Crash loads as specified in AC43-13-2B? Or flight loads on the wings, which are specific to the wing geometry? Landing and take-off loads, which may be determined by the type of runway on which you are landing (gravel, grass, pavement, etc.)?
Sorry, but your question is a little vague. To the...
You may also want to look at the properties for the resin system. If you can imagine, the out-of-plane properties are primarily the resin properties, which are usually fairly isotropic, so E13 = Eresin, G13=G23=Gresin, etc.
I think I originally misunderstood your question. You are looking for...
All of these properties can be approximated from the properties of the constituent materials. I'm not near my books right now and the equations are pretty long, so I'm not walking around with them in my head.
As for Poisson's being too high, is it >0.5? If not, what software are you using. I...
What type of analysis are you trying to do?
Linear analysis, you are trying to use a "gap" element
Non-linear analysis, you can use a curved Truss element or a contact element.
Calculate the time it will take the object to hit the ground using classical physics (hand calc). Divide that number by 10 to begin with. You may want to try it again with 100 steps to hit the ground.
If you are in a country where English isn't the first language, perhaps you can start a trend! "Analysist" - one who conducts "analysises". I kinda' like it! [rofl]
