Questions tagged [control-system]

A system that may be electronic circuits or even software that uses control theory (principally differential equations) to control an output by monitoring various aspects of the system under control and varying inputs all towards meeting a defined goal. Some famous examples are controlling a rockets thrust angle to ensure directional control.

Filter by
Sorted by
Tagged with
1
vote
1answer
56 views

How to find the phase of this transfer function?

I have been trying to find the phase of this transfer function: G(jω)H(jω)=0.1695/jω(5.88jω+1) by doing this: Phase = -arctan(0/0.1695)-arctan(w/-5.88*w^2) PHASE = 0-arctan(1/-5.88*w) Is this ...
1
vote
3answers
89 views

Feedback response in linear system

I have a linear system with transfer function \$G(s)\$ that is connected in negative feedback with a real value gain \$K\$. Therefore the open loop transfer function is \$K \cdot G(s)\$ and the ...
2
votes
3answers
61 views

Finding the impulse response from the integral

I'm trying to solve the part (a) of the following: I know that: $$ y(t) = \int_0^1 \! \delta (t-\lambda ) \mathrm{d}\lambda $$ But I'm not sure how to proceed from that.
1
vote
1answer
142 views

Closed loop vs. open loop system analysis and design

I have found questions similar to mine in the forum but none were quite answered to my full satisfaction. I have two questions: 1) Why is controller design is traditionally done with the open-loop ...
0
votes
0answers
17 views

Determining closed loop stability by nyquist criterion

G(s)H(s)=2.2/s(s+1)(s^2+2s+2) how to determine the closed loop stability using the nyquist criterion and how should I start implementing on matlab
0
votes
0answers
34 views

How can we plot Non minimum Phase system Root Locus?

I have a closed-loop transfer function $$ H(s)=\frac{K(2-s)}{s(s+18)}.$$ I know that this is Non-Minimum Phase system, but I could not determine the points that cut through the real axis, the ...
0
votes
2answers
37 views

Control system basic feedback loop, what's happening at the initial state?

How can the system output be dependent on itself, when at the initial state there is no system output? I don't understand how it can work physically.
0
votes
0answers
48 views

How to fix triac control module?

This is scheme of triac control module. I'm using optotriac MOC3041 (T1 on scheme) and triac BTA140 (T2 on scheme). Is it possible that my control module doesn't work correctly due to too small ...
3
votes
3answers
147 views

Best way to track light source?

I want to build a 1-D (azimuth), bidirectional optical tracker. The idea is to have two identical transceiver, mounted on DC servo-motor. The user can move the two servos on rails (reasonably fast), ...
1
vote
1answer
61 views

How to determine the settling time from a transfer function?

Given the transfer function \$G(s)=\frac{(1-\frac{s}{3})}{(\frac{s}{0.1}+1)(\frac{s}{100}+1)^2}\cdot 10\$, I would like to calculate the settling time. From what I've learned, this is a third-order ...
1
vote
1answer
42 views

Is Integral gain much use with a frequently changing setpoint?

I have a motor/encoder setup with a PI loop, where the motor needs to travel to a certain position following an accel/decel profile. The setpoint in this case is position at time T, which changes each ...
2
votes
2answers
53 views

Help with a Closed loop and zero order hold function ZoH * 1/s(s+a) type

i would appreciate some help in solving this problem, i need to find the transient response for a unit step, i have a brief idea of how to solve, but my graphs in matlab doesnt seem to fit with the ...
1
vote
3answers
118 views

How does an active filter transfer function translate to a block diagram?

I am having troubles trying to translate when finding a transfer function of an active filter is it in a 'Close loop' or 'Open loop' state? When finding the transfer function of these active op-amps ...
0
votes
3answers
116 views

Ultra-narrow beam spread LASER diode

I want to build an optical position tracking system based on PSDs (Position-sensitive detectors). I searched online and found this PSD which has a sensitive area of 12 mm*12 mm. My goal is to allow a ...
1
vote
0answers
66 views

Converting an analog Butterworth filter into a discrete filter

Here again to ask about another question. This time asking how to convert an analog transfer function to a discrete transfer function using standard continuous to discrete methods. The application ...
0
votes
1answer
62 views

Drawing Signal Flow Graph from Bridged-T Network

I am confused about where to place R1. Is it a feed-forward or feedback term? Y1 and Y2 are admittances representing the capacitors.
0
votes
1answer
86 views

Closed loop impedance of buck converter

I found it easy to workout the open loop input impedance and the open loop output impedance of a buck converter. But when it comes to the closed loop output impedance, it is hard to me. In some books ...
0
votes
1answer
173 views

Get transfer function from state space

The following system is given and I'm asked to find the transfer function $$\frac{Y(s)}{U(s)}=G(s)$$ $$\bar {\dot x}=\begin{bmatrix} 0 & 1 & 0 & 0 &0 \\0 & 0 & 1 & 0 & ...
1
vote
2answers
63 views

Component connected in series in a block diagram of a control system

I am given the following block diagram of a control system (I think it also applies to electrical circuits as well with linear components. Correct me if I'm wrong). My textbook says that C(s) is ...
0
votes
1answer
41 views

How can this problem be solved with partial fractions? (Zero order holder with g(s) block function)

im trying to figure out how to solve this problems for values a=2; actually im stuck, professor told me how to work it, but i cant figure out what to do exactly, we are using partial fractions inverse ...
1
vote
2answers
74 views

Response of a RC circuit and Frequency Response Theorem

let's consider this important result of control theory for linear systems, called "Frequency Response Theorem" (reference): Briefly, it says that under the hypotesis of stability and linearity, if ...
3
votes
4answers
1k views

PID controller slowly oscillates out of control

I am trying to tune PID controllers for my drone. There are 3 controllers, one each for Pitch, Yaw and Roll. I have gotten Yaw tuned to a reasonable amount and I am assuming the values for Kp, Ki and ...
0
votes
1answer
64 views

Ziegler–Nichols method, use time value of 63% of process variable or steady-state level line?

I am attempting to use the Ziegler-Nichols method to PID tune a system. However, in calculating the tau/time constant value I have come across two different methods and am unsure which to use? ...
1
vote
2answers
71 views

High level vs low level motor control - acceleration and velocity profiles

I was wondering how are motor control loops normally run? Lets say we have an autonomous car and a Model Predictive Controller defines a velocity and acceleration profile to get to the correct ...
3
votes
3answers
317 views

Source of poles and zeros in a physical system?

From where does the poles and zeros come into the transfer function of any system? And I am not looking for an answer in terms of mathematics but want to know what is there in any physical system that ...
1
vote
1answer
71 views

How to find second order transfer function from a graph?

I have been given this step response graph and asked to determine the second order transfer function of the system. I completed the question, using a lot of help from this post and got the answers ...
0
votes
0answers
38 views

Discrete time state space matrices for LQR tracker

How do we find the F(T) and G(T) matrices in this digital LQR tracker example? Here is the question from a control systems engineering textbook: And here is the solution: And here are the ...
0
votes
0answers
41 views

Transfer function derivation from Op-Amp linear control system

Need to derive transfer functions for blocks B, C and D, unsure on the best method to do so. Any suggestions?
1
vote
2answers
175 views

What is the best way to design an emergency button circuit?

I am using an Arduino ATMega as a controller and I have a few methods in mind to operate the emergency button (hardware and software.) utilizing the interrupt button while loop, with a pull down ...
19
votes
13answers
8k views

Why only sine waves?

I have already read a few EE texts where a sine wave is often seen. Why is the sine wave often used as a test function for a circuit or a system? Why don't we use any other signal instead of sine? ...
0
votes
0answers
42 views

How do I read a step response of the control effort?

I am trying to plot the step response of the control effort of two systems defined with two different controllers, and the plot is: I see that the system which is represented by the red line goes ...
0
votes
1answer
48 views

Does the unit step response not affect the transfer function?

I am still confused, this question says that this figure shows three unit step responses and was asked to find the transfer function. Doesn't the input step responses only affect the output? So to ...
0
votes
2answers
727 views

Reading a high-speed rotary encoder with a Raspberry Pi

I'm trying to setup a Raspberry Pi to measure the position and speed of 8 DC motors that all have incremental quadrature encoders. At full speed (unloaded), each encoder ticks at 3.3 kHz. I assume ...
0
votes
2answers
49 views

Eddy current damping compensation

I have a magnetically permeable element (98% pure iron) vibrating at 3-5Hz between two electromagnets (with iron cores) which is experiencing too much damping, presumably due to eddy current losses. ...
1
vote
1answer
26 views

Advice on connecting heater directly to SP2 relay of PID controller?

I have an old Omega CN-9121 PID Controller and a 105Watts 115V Fibre heater mantle with an inbuilt K-type CHromel-Alumel temperature thermocouple also attached into it. I plan to use the PID ...
0
votes
1answer
30 views

Interpreting basic contact and switch behaviour in a control system diagram

This might sound a stupid question but in a control system using buttons and contacts I have a bit confusion when it comes to picturing the real device. As an example if we have the following diagram: ...
0
votes
1answer
44 views

Doubt on singular value decomposition

I am studying control systems and I am studying the topic of Singular Value Decomposition(SVD). I have found a transfer matrix of a systemm, and computed its DC gain. Then I have performed the ...
0
votes
1answer
81 views

PI Compensator (for DC-DC Converter Control) transfer function derivation

Here is a PI compensator implemented using a OP-AMP. However, I'm wondering why Gc(s) = - vc/v, instead of vc/v. Not quite sure why there is a negative sign here since Gc(s) is defined as vc/v if I'm ...
0
votes
1answer
48 views

State-Space-Model from more dimensional Transfer-Function

Im trying to extract the State-Space-Model for an cascaded Buck/Boost-Converter from an set of Transfer-functions \$ G(s)\$ (which I generated with Plecs/Matlab). First of all I want to analyse the ...
0
votes
0answers
32 views

When do the positive sequence negative sequence, and zero sequence apprea?

I have analyzed three phases current in different cases, but I am still confused about some cases. Positive and Negative sequences are appeared but not the zero. Zero sequences is appeared, while ...
0
votes
2answers
80 views

Why does a pole at high frequencies attenuates noise?

I am trying to understand the concept of realizability for an improper transfer function, and I am struggling to understand some concepts. I know that if I have an improper transfer function, for ...
1
vote
1answer
56 views

What is a non causal system?

I am stydying control systems, and I am trying to understand better the topic of causality. I know that a system is causal if the actual state depends only on the past states and on the present ...
0
votes
3answers
488 views

What supplies ATS control circuit when the mains fail?

In a church, I've seen a large generator and ATS panel (automatic transfer switch) so that the generator turns on when there is a failure in the mains. If there is no power in the mains, How does the ...
1
vote
1answer
59 views

Why if I add a pole at high frequencies to an improper transfer function it becomes realizable?

Suppose I have an improper transfer function, for example: \$T(s)=\frac{s^2+1}{s+2}\$ I know that this transfer function is unrealizable. Moreover, I have seen that to make it realizable it is ...
0
votes
1answer
72 views

RHP zeros in control systems

In the slides of the following link is expressed the concept I am trying to understand : slides I am studying control systems. I have seen that if I have a zero in the RHP, by using decoupling I can ...
0
votes
1answer
81 views

How do I get the transfer functions of each channel for a control system?

Consider acontrol system with the following transfer matrix: \$G(s)=\begin{pmatrix} G_{11}(s) & G_{12}(s)\\ 0&G_{22}(s) \end{pmatrix}\$ and suppose I want to get the transfer functions ...
0
votes
0answers
39 views

op amp stability theory

A little stuck and could use some help. This TI stability App Note on page 15 calculates the Thevenin equivalent circuit of a capacitively loaded op-amp and I can't figure out how they get that form ...
1
vote
0answers
63 views

Closed-loop system with two cascaded P-controllers produces error increasing with time

The task: I control desired angle \$\theta_{d}\$ with two cascaded \$P\$-controllers, the outer is for desired angular velocity \$\omega_{d}\$ and the inner is for desired angular acceleration \$\dot{...
0
votes
0answers
27 views

How to find the frequency responses for the below conditions in the eye model?

In the above image it says to calculate the steady state responses for a unit step response. But i need to find calculate the frequency response for the same model.
2
votes
3answers
127 views

Transfer function of a classic controller

I want to calculate the transfer function and the gain, zeros and poles of the transfer function, considering that: $$R_1=R_2=R_3$$ $$C_1=C$$ I want to know if this circuit is a P, or PI, or PD, or ...

1 2
3
4 5
17