RCS of an Aircraft/Wing

[FelixSPurn]

Good evening everyone,

Hi sir, first of all I am a student which is majoring in aerodynamics. I took a new topic for my assignment about monostatic radar cross section (RCS) of an aircraft/ simple wing.
I already tried to search any tutorial about it on the internet, however I couldn't find any tutorial in calculating RCS of wing/Aircraft using HFSS.
Since there is no one in my school who is capable in using HFSS, and as far as I know, this thing is new in my school, I'm really stuck.

I already found the ANSOFT Tutorial in calculating RCS but the tutorials are not for calculating .wing/aircraft.



1st)
**broken link removed** by creating an airbox outside the PEC box and another tutorial about calculating RCS of an ogive : This is the tutorial for calculating RCS of an ogive



2nd)
**broken link removed**

and this is the tutorial for calculating RCS of an PEC inside of airbox

If I am gonna make a simulation of an aircraft, which tutorial do I should follow?
I'm confuse between creating an airfield and follow the 2nd tutorial, or I could just making a wing and solve it using the steps on 1st tutorial (which is about ogive)?

I really appreciate any kind of help.

Thank you very much for helping me.

 

[kthackst]

I have not used HFSS to this industrial level before, but if you are looking for somewhere to stat, I would definitely suggest importing a CAD model and characterizing your materials afterwards. This is not trivial, but I think as an aero engineer you'll be far more equipped to make a very impressive CAD model and import it into HFSS and just assign boundary conditions.

I can only read the second tutorial, but I think importing aircraft (I don't see what you gain by simulating just a wing, I would simulate two aircrafts with different wings separately) and following the rest of the tutorial would be doable.

 

[FelixSPurn]

I have not used HFSS to this industrial level before, but if you are looking for somewhere to stat, I would definitely suggest importing a CAD model and characterizing your materials afterwards. This is not trivial, but I think as an aero engineer you'll be far more equipped to make a very impressive CAD model and import it into HFSS and just assign boundary conditions.

I can only read the second tutorial, but I think importing aircraft (I don't see what you gain by simulating just a wing, I would simulate two aircrafts with different wings separately) and following the rest of the tutorial would be doable.

I only want to study what is the effect of an aircraft wing in their RCS like if we swept the wing, will the RCS reduce, something like that, therefore I will try from wing.
ah sorry
the 2nd tutorial is here : https://www.google.co.id/url?sa=t&r...XD1B4KnSTLWAharK94tfaQ&bvm=bv.125221236,d.c2I


said if I import an aircraft then I can just follow the 1st tutorial sir? Just substituting the ogive with an aircraft model in HFSS-IE?
Thank you very much sir

 

[kthackst]

Watching the tutorial you just posted, you can see the user creates two boxes: the first, smaller box is pec (perfect conductor) which is what he/she wants to evaluate the RCS of. The second box is how they begin going about making their boundary conditions, in this case a PML (perfectly matched layer, which simulates free space). HFSS has a helpful way for making the PML for you, which is displayed in the tutorial, and mentioned a bit more in detail in this thread: https://www.edaboard.com/threads/3146/

The user in this tutorial also defines some mesh operations; this is not something you need to get into right now, that's typically just a way to speed up sim time.

After this the user defines their solution setup: note they change the solution frequency to the frequency of interest, for you this is the frequency the radar operates at!

Finally the user runs the simulation, waits a few minutes, and then goes under "radiation" and creates two far field setups. From there they can go to the fields report option and use the RCS command to calculate the RCS. You can go on to plot this value as well.

For your application, you can follow this video the same way, except for instead of the inner cube generated at the beginning, you should place your wing, and instead of assigning a pec material, you can use something more plane like, such as aluminum. Or perhaps you would have a better idea of what material to use, I'm no aircraft expert. Again, unless your wing is a very simple geometry, I recommend looking into importing geometries into HFSS from other CAD software.

 

[FelixSPurn]

Watching the tutorial you just posted, you can see the user creates two boxes: the first, smaller box is pec (perfect conductor) which is what he/she wants to evaluate the RCS of. The second box is how they begin going about making their boundary conditions, in this case a PML (perfectly matched layer, which simulates free space). HFSS has a helpful way for making the PML for you, which is displayed in the tutorial, and mentioned a bit more in detail in this thread: https://www.edaboard.com/threads/3146/

The user in this tutorial also defines some mesh operations; this is not something you need to get into right now, that's typically just a way to speed up sim time.

After this the user defines their solution setup: note they change the solution frequency to the frequency of interest, for you this is the frequency the radar operates at!

Finally the user runs the simulation, waits a few minutes, and then goes under "radiation" and creates two far field setups. From there they can go to the fields report option and use the RCS command to calculate the RCS. You can go on to plot this value as well.

For your application, you can follow this video the same way, except for instead of the inner cube generated at the beginning, you should place your wing, and instead of assigning a pec material, you can use something more plane like, such as aluminum. Or perhaps you would have a better idea of what material to use, I'm no aircraft expert. Again, unless your wing is a very simple geometry, I recommend looking into importing geometries into HFSS from other CAD software.

Hi Kthackst

I see, therefore should I follow the 2nd tutorial (https://www.google.co.id/url?sa=t&r...XD1B4KnSTLWAharK94tfaQ&bvm=bv.125221236,d.c2I) instead of the 1st one (**broken link removed**) then ?

And for the excitation wave, if I'm going to analyze at one plane then should I create for example 0<PHI<360 and constant Theta ?

Once again I'm very sorry for asking many things sir.
Thank you very much

 

[kthackst]

I believe that is correct, but I do not have enough personal experience with RCS to give you a confident answer.

 

[newUser2010]

I have never used HFSS, I can help you if you use newFASANT and solve all your doubts.

You can try the free version **broken link removed**