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amalakas

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  • AerospaceEngineer
    Post 2(continue from Post 1):

    I am expert at Solid Works but now using Pro-E, because raytheon uses Pro-E. First I draw the model using Pro-E. I am also now an expert at FEA( Finite Element Analysis). I input my solid work or Pro e model into ABAQUS or NASTRAN to do stress analysis!!

    Again stress analysis has nothing to do with control. But it is also part of my work!!

    Now for advanced control!!

    1. Use hamaliton method as well as lagraguage method get the equation of motion. It is of course nonlinear!!!
    2. Then use laponov method tp determine stability!!!!!
    3. Then apply non linear control theory to design and analysis the system.
    4. I also write code in C language to implement my control design.

    You are just a moron, aske me some baby questions and you think you are an engineer??
    AerospaceEngineer
    Post 1:

    To answer your question very easy!!!!!!

    1. PM phase margin. CL closed loop system.

    To find the phase margin you can use many ways, root locus is useful to determine if the system is stable. I use MATLAB to do that, so easy. But the best way is to use frequency response method. Use the bode plot, MATLAB dose it all!!! However, your question is very very foolish to even ask.

    Finding out the phase margin and gain margin these things are for linear systems only, you can linearlize the nonlinear system but 90% of the time you CAN NOT!!!! So you need much more advanced method!!! lol

    I bet you greeks have no idea right?? Otherwise you will not even ask me such a simple question!!!

    WELL LET ME show you white greek europeans how to do it then!!!!

    The controls I do is far more complex. I am a dynamics system enginneer. I model complex solid model and then use dynamic modeling to obtain differential equations.
    sid1508
    Hello there, I am from India.
    I want to say that Greeks are nice people.
    I have a Greek friend on facebook. She lives in Thessaloniki.
    sancho
    Hi, now I know what you mean with 2 x IRST, but I'm afraid that you are mistaken here. The system will most likely be the IR MAWS, comparable to the system developed for the Su 34 (the T50 is based on some Su 34 parts anyway) as you can see here:

    http://www.ausairpower.net/Su-32FN-Systems-PLA-N.png

    This graphic is confirming that as well (French translation of an Russian article):

    http://img20.imageshack.us/img20/7594/butowskipakfap3.jpg

    The part you mean is the number 3 and translated it means detector of IR emmisions.
    A real IRST seems to be planed only in front of the cockpit (number 2 in the last graphic), which is the normal position of Russian IRST systems.

    Btw, it is not correct that you need seperated engines for 3D TVC, because both nozzles will move to left and right, which means the jet blast will not hit each other. The Eurofighter has 2 engines right next to each other and they developed 3D TVC nozzles for it and as it seems J20 plans to have it too.

    Regards!
    sancho
    Hi, thx for your fast reply!

    I know about the radars of T-50, but you meantioned 2 x IRST sensors and that's something that I didn't heared of so far. So can you tell me more about that?

    Also I know that the design has advantages in terms of fuel, or weapon carriage, but by the fact it is not only aimed to be a stealthy upgrade of the existing Flankers, similar to the F15 SE, but to be a real stealth fighter like the F35, or even F22, stealth should be a big point in the design right? So what's you point on the design in regard to stealth?

    Regards
    sancho
    Hi, I found this in one of your posts in the J20 thread:

    Multi Sensors ( 2 or even 3 radar systems, + ECM, + 1 or even 2 IRST sensors)

    Can you tell me where you get this info from? And do you think it was a good decision of Sukhoi to prefer the lift body design, instead of using a simliar design like the US fighters, or J20 for better stealth features (flat fuselage, ducted intakes)?

    Regards, Sancho
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