Signal Processing Stack Exchange
Signal Processing Stack Exchange

Questions tagged [control]

41 questions
13
votes
6 answers

Relation between signal processing and control systems engineering?

Control systems engineering and Digital signal processing are both important courses/subjects of electrical engineering But how these two subjects/courses are related to each other?? Also please kindly let me know,what are some recommended resources…
LECS
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2 answers

Stabilizing the inverse transform of a system

Currently I am trying to understand an unknown mechatronic system. I used white noise as an input signal and measured the output of the system. Then I estimated a second order SISO transfer function (Output/Input) in the frequency domain using…
Matthias La
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3
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1 answer

What does it mean that a zero is slow?

I am studying control systems, and have encountered the definition of a slow zero. I am searching on internet and in books, but I don't understand the meaning this. I know that if a zero is too slow, it introduces a resonance peak and an overshoot…
J.D.
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3
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1 answer

Is it possible to use a control scheme with a delay as prefilter?

I am studying control systems, and in my studies I have encountered the topic of control scheme of the form and I have seen thaht this control scheme is really useful since it is possible to add a lag or lead compensator outside the closed loop,…
J.D.
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3
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2 answers

Why does the control effort increase if the bandwidth of the system is higher then the bandwidth of the plant?

I am studying control systems and I am focusing on the control effort. I have seen that if I place a pole at higher and higher frequencies, if the bandwidth of the system goes above the bandwidth of the plant, the control effort increases at high…
J.D.
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3
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1 answer

Lead compensator vs lag compensator?

I already know that lag compensator acts like PI controller and improves steady state and lead compensator acts like PD controller improves transient state but how they achieve their goal? Despite the fact that apparently both lead and lag…
DSPCS
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Are there control loops that attempt to maximize a process variable?

I'm working on Remote-Procedure Call (RPC) server that processes incoming streams of data from clients, and looking for a way to set a limit on the number of simultaneous streams allowed. There is some bottleneck in the system (such as CPU time or…
jacobsa
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2
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1 answer

Tuning a PID Controller

I have the following transfer function $$10000 \cdot\frac{(s-0.012)(s+1.05)(s-18)}{(s+0.22)^2(s+45)(s+1000)}$$ For which I am trying to tune a PID controller for. I'm using the pidTuner in MATLAB to do so. I wish to have the settle time be less than…
cicey60307
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1 answer

Why do we use "error quaternions" for control of attitude?

I'm working on an attitude control system in terms of quaternions, and i'm basing my approach on the book Space Vehicle Dynamics and Control (2nd ed.). If we consider a proportionate controller, i.e. $$\mathbf{u} = -\mathbf{K}_p \mathbf{q}_e $$ it…
Thomas Wagenaar
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2
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1 answer

Controller in the feedback path?

What happens if the controller of a closed-loop system is placed in the feedback path before the summation point, instead of between the summation point and the plant to control? Are we allowed to do so? If so, what are the main differences? Thanks!
Manzillo
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1 answer

Region of root locus not inside the feasible region for a given performance specification

I wanted to plot the root locus for a system, whose plant transfer function is $$ P(s)= \frac{k}{Ts+1}e^{-ts}. $$ A PI controller was suggested for this system, and the task is to find $K_p$ and $K_i$ values, such that it satisfies the following…
Dhanush Ja
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2
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1 answer

Feedforward disturbance signal compensation

The reference Feedforward control concepts through Interactive Tools says, to minimise the effect of the disturbance $d$ on the process output $y$, a compensator $G_{\text{ff}}=P_3/P_1$ shall be used. From a theory point of view, no problem. Even a…
mikebuba
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2
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1 answer

Does a RHP zero imposes some limitation in the time domain?

I am studying control systems and I have seen that a non-minimum phase zero imposes a limitation on the bandwidth, which is that the bandwidth has to be lower than the frequency which is half the frequency of the RHP pole. I have also seen that it…
J.D.
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2
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1 answer

Doubt on the relationship between the sensitivity and the complementary sensitivity function

I am doing loop shaping with the following transfer functions: G = 10/((s+10)*(s+1)); K1 = 0.5/s; where G is the process and K1 is the controller, and If I increase the badwidth of the seisitivity function in this way: I have that also the…
J.D.
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2
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2 answers

Understanding Matlab's Automatic Gain Control function

I am trying to understand the automatic gain control block provided by the communications toolbox. The documentation is here: Documentation My questions are in regards to two of the configurable parameters, the DesiredOutputPower and…
yellow_watermelon
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