# Questions tagged [control-engineering]

Questions about the models and theories of control engineering and the application of control theory to design systems with desired behaviors.

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### Is there any other controller than PID Controller?

I have been given a Project to search for a controller having better transient response than PID Controller. I searched but I didn't find any research paper on it. All are talking about improving PID'...
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### Solution to autonomous differential equation with locally lipschitz function

As I was learning about the following theorem and its proof from the book Nonlinear Systems by H. K. Khalil, I encountered a difficulty in grasping some parts of the proof. Theorem: Consider the ...
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### Nyquist Plot for the exponential term involved in the equation

I have been trying to solve the part b of this question which was in one of my assignments. I am not able to arrive at the closer values to plot my Nyquist plot. Any help is appreciated.
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### Calculate propeller's thrust & torque coefficient for a quadcopter brushless motor

I'm building a quadcopter and I need to know how to calculate the thrust and torque coefficient, $F = bw^2$ and $T = cw^2$ I need to get the $b$ and $c$ (but don't know how to). I'm using 1045 ...
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### Gain and Phase Margins from Bode Plot

What's the interpretation of the margins when the curve of magnitude never crosses 0 dB or the phase curve never crosses the -180º? For example: $$G(s) = \frac{s+20}{(s+1)(s+7)(s+50)}$$ I know that ...
44 views

### Nyquist Stability Theorem and Clockwise/Counter Clockwise Encirclements

According to argument principle, if a contour encircles a number of poles and zeros of a transfer function, the number of origin encirclements can be deduced by : ...