Asking for help for a FLUTTER analysis

[K.O.]

Hi, I'm aerospace engineer working on a project that involves the FLUTTER study of a forward swept wing but I'm struggling in finding the flutter speed, can you please take a look at my question where I explained how I built the model and the analysis and tell me if is there anything wrong? (I also uploaded the .modfem file)

https://community.sw.siemens.com/s/question/0D54O00006Y1NUCSA3/problem-finding-flutter-speed

Thanks in advance.

 

[rb1957]

USAF did a forward swept demonstrator in the past. See YouTube for videos of "the most unstable plane ever!"

I'm not going to look at your modfem !

Modelling for flutter usually involves a stick model with aerodynamic and inertial loads applied.

There are lots of texts out there for flutter and aeroelastic analysis.

btw, student posting is not allowed.

another day in paradise, or is paradise one day closer ?

 

[K.O.]

Thank you rb1957, the forward wing that I mentioned is exactly of the Grumman X-29.
I did't use stick model because it isn't so complex, like for modelling the entire aircraft, also I saw that Femap can give good results in modelling the wing with plate elements.
I know theory behind flutter phenomena..
What I'm interested in is to improve my understanding and skills regarding Femap.
P.S.: I'm not exactly a student I'm a PHD student, so consider me as a researcher

 

[rb1957]

a PhD student is still a student. There is plenty of material out there on this. Stick models are used precisely to simplify the modelling, to capture the essential behaviour. Sure you can use a full model (and possibly Grumman did that for the X29) but typical transport analysis (with metal wings) is done with stick models. A full FEM will only take more time to solve. The important part is to have a test basis for your FEA.

another day in paradise, or is paradise one day closer ?