aaaaaaaaaaaaaa My friend the aerospace engineer.... tell me you engineer you...
do you remember this ?
[SIZE=6[COLOR="#FF0000"]]I asked you a while back ...
you still haven't answered.. I am still waiting...[/[/COLOR]SIZE]
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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.
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??