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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.

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46 views

How to find phase margin here

Please reference this question: I am not able to find gain cross over frequency to find phase margin. Gain margin is coming infinity here.
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1answer
44 views

linear model of a power load at the end of a transmission line

I am working on a controller that will regulate the voltage at the end of a transmission line into a variable load. I am able to ignore the inductive effects of the line at the frequencies of interst, ...
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45 views

pid controller vs on off controller? [closed]

I have read that both pid and on-off controller belong to the class of classical controllers but what are the differences between pid controller and on off controller? I think control valve is ...
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1answer
22 views

state space representation of system with a disturbance

my question is how you can convert the bloc diagram which have a disturbance input to a state space representation and how you can calculate the controllability matrix then if you can give me any ...
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2answers
39 views

Confusion understanding transient behaviour?

I am trying to simulate PID controllers in MATLAB Simulink, but I am bit confused by the term "transient behaviour" in how its extreme highlighted forms (aggressive and robust) will affect the system ...
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1answer
34 views

Observability matrix different forms

The observability matrix formula is present in two forms in textbooks. My question is about which one to use. the first one: the second one: Now when applying both on the same system, I get ...
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2k views

Confusion in PID loop?

I am already studying PID control and some how to some extent I have understood it except one main confusion. When the difference between reference input r(t) and current output value y(t) is zero, e(...
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14 views

Possible inconsistencies in solution to second order transfer function step response

I'm trying to use matlab to solve the second order DE for car suspension for a particular oscillation period and overshoot percentage (0.5s and 5%). I thought I had solved it but I've found some ...
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18 views

What is the residue of a response component in Control System Engineering?

I have read Norman S Nice book in Control Systems Engineering, I found in some pages the word residue which get me confused. Could you please help me to understand what does it mean if it says " the ...
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10 views

Constant force opposing hydraulic winch [migrated]

I have a situation that I am hoping to solve with the use of electric motors, and a variety of controls. I have a hydraulic winch which turns at speeds from 0-60 RPM. This winch is coiling and ...
2
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1answer
84 views

What does zero transfer function mean?

I am solving a problem where I have to find the transfer function of a system. The system is $$A = \begin{bmatrix}2&-1&2\\0&1&-2\\0&0&-1\end{bmatrix}, B = \begin{bmatrix}1\\1\\...
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1answer
57 views

DC-DC Converter Control Loop Stability

I have asked a similar type of question previously. This one is a little different. Assume, we have the Bode plot of a Control Loop System. In this case, DC-DC Converter. I measure the Gain ...
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35 views

Control Loop Stability - Crossover frequency

I am testing the control loop stability of a DC-DC Converter. One of the Pass-criteria of the DC-DC Converter states, "Cross over frequency should not be higher than 1/8th of switching frequency" ...
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2answers
42 views

How to use MATLAB to observe the effect of multiple damping factors?

I want to use MATLAB to observe the effect of changing zeta (damping factor) on system response? Here is a m-file code that plots three responses: underdamped, overdamped and critically damped. <...
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3answers
238 views

Confusion in block diagram of open loop and close loop control system?

I am studying Modern Control Systems, 11th edition, by Dorf and Bishop. On page 221 it first shows in fig4.7 open loop control system(the writer names it as open loop) and on page 222 close loop ...
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2answers
457 views

Confusion regarding control system of a Mars rover

I am studying Modern Control Systems, 11th edition, by Dorf and Bishop. In its fourth chapter, it discusses design examples and one example is of a Mars rover. In that example, I am confused by the ...
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1answer
43 views

In practice, what is the difference between the “nominal plant model” and the “plant model”?

I am reading a book on nonlinear control and disturbance rejection, and in many examples, they distinguish between the "plant model" \$G_p(s)\$ and the "nominal plant model" \$G_p(s)\$. They also add ...
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1answer
35 views

Controlling multiple floating power supplies from a single point

I have assembled a power supply from five HP dps-750rb common slot power supplies. All five units are in series. I have the first grounded electrically and have the other four units modified and ...
2
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1answer
68 views

Final Value Theorem yielding the wrong result?

C1 has an impedance of 1/0.1s Ohm in S-domain. Its impedance together with R1's is 100/(10s+10) Ohm The transfer function is: $$\frac{V_2}{V_1}=\frac{5}{\frac{100}{10s+10}+5}=\frac{50s+50}{50s+150}$$ ...
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20 views

High-torque low-speed switched reluctance motor: design Features

I am studying the design of high-torque and low-speed switched reluctance motors (SRM). There are classic designs (8/6, 10 / 8,12 / 8) and designs with multi-toothed rotors and with additional teeth ...
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1answer
42 views

Confusion in close loop block diagram

I am studying chapter 4 of Dorf title Modern Control systems(11 edition) I am trying to use MATLAB or Labview to implement block diagram for open loop control systems for speed control of an armature ...
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37 views

Why does continued fraction expansion work? [migrated]

While checking whether the given polynomial is Hurwitz or not, we perform continued fraction expansion. We were taught how to perform this check(i.e) look at the sign of the coefficients of the ...
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2answers
67 views

Disturbance Rejection in a Closed Loop Control System

I was reading an article about disturbance rejection of closed loop control system and I came across the sentence "becomes almost zero, and the effect of the disturbance is suppressed." I have also ...
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2answers
65 views

Is a type 2 system is always unstable?

If there are multiple poles at origin, that system is unstable. So a type 2 system will be have s^2 in denominator. So this should be unstable right? Correct me if I am wrong.
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2answers
54 views

Difference between four matrices of state space?

I already know that there are two common types of representations used for mathematical modelling. One is transfer function and the other is state space. When dealing with state space representation, ...
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1answer
45 views

Confusion regarding step responses of integrator and differentiator?

I am using matlab to study about step response of integrator and also of differentiator using transfer function modelling technique But i have two confusion, one in case of integrator is that step ...
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0answers
29 views

Control of a time-variant system

I am working in a control project in which I need to control two variables \$x\$ and \$y\$ according to their reference values. Since I don't have an advanced knowledge in modern control theory, I ...
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1answer
109 views

How does the second order time constant affect circuit behavior?

I learned that the transfer function of a second order circuit can be expressed in the following standard way: $$ \frac{K}{\tau_s^2 s^2 + 2 \zeta \tau_s s + 1} $$ Where: \$K\$ is the gain \$\zeta\$ ...
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2answers
38 views

Level system of water tank?feedback of close loop? [duplicate]

I have attached a photo from animation from following link https://beta.spiraxsarco.com/learn-about-steam/basic-control-theory/basic-control-theory this photo shows a float in a water tank, it ...
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2answers
66 views

How this close loop control systems work? [duplicate]

I have attached photo of a lecture where a slide is showing a close loop control system(theif repulsion system). But i am confused by the electric eye?how it is working?is the robber/theif so mad that ...
5
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3answers
643 views

Confusion in understanding control system?

I am learning basics of control systems from following link http://instrumentationandcontrollers.blogspot.com/2010/11/types-of-control-systems.html It says that automatic washing machine & ...
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0answers
35 views

Transient Response and s-plane root location

A second-order system has the closed-loop transfer function T(s)=Y(s)/R(s). The system specifications for a unit step input is as follows: I managed to solve the problem until this step. But I am ...
2
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1answer
94 views

Linearizing hall effect sensors outputs

I'm trying to find a robust solution to linearize four hall effect sensors outout to obtain a signal that I can use in a PID control scheme. The output data is collect via 4 ADC channels on an ...
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3answers
888 views

The term Feed-forward and its meaning?

I am trying to understand the technical meaning of the term 'feed-forward', when and where it can be used and where it cannot be used? I have seen this term in various different areas. For example: ...
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38 views

Nonlinear Observer Question for BLDC

I'm looking at the article posted here, and I'm trying to figure out what it is that they're controlling and how. Specifically, Dave Wilson from TI gave a presentation called "Teaching Old Motors New ...
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1answer
51 views

Can my PID controller have negative p value and positive i value for a PID logic

I am building my first PID controller. My process variable and my actuator value are inversly related, meaning if actuator value increases process variable decreases, and vice versa. So I have tried ...
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1answer
51 views

Control theory in PLC (programmable logic controller)? [closed]

What is the control theory of PLCs (programmable logic controller)? PLCs fall in category of linear control or non linear control?
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1answer
87 views

How to get from theory to a working Industry Control System?

EE Student here who recently finished the classical control theory class. I was wondering the process of how the industry or anyone goes from drawing block diagrams to actually implementing in ...
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77 views

What will be minimum number of states / state variables for these control systems in state-space model?

Consider the systems as LTI and SISO with transfer functions given below: I have read that minimum number of states for an LTI SISO system required to represent in state space analysis for any ...
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28 views

Transfer function using signal flow graph problem

Determine the system transfer function for the following signal-flow diagram of figure I have shown my attempt of solving this problem. Can anyone tell me whether I did this problem properly?
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28 views

Controller and compensator

What is the difference between controllers and compensators While searching for answer the most prominent answer I got was that compensator have magnitude=1 and is used to make sure the system ...
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1answer
43 views

How can I prove that for any control system root locus plot starts from poles of OLTF and ends at zeroes of OLTF?

simulate this circuit – Schematic created using CircuitLab G(s)H(s)=N/D T(s)=KN/(D+KN) Proof: ] But For K=0 T=0 For K=infinity T=infinity then how can K=0 {condition where forward path ...
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41 views

What is this functions Phase crossover frequency?

OLTF loop gain My approach What I have done wrong?
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40 views

How to find Phase crossover frequency?

I make the imaginary part of \$loop \ gain=0\$ to find phase crossover frequency. But in one video, the person told that this method can only be applied when Polar plot crosses the real axis and ...
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37 views

Gain margin using Root locus plot

How can I find Gain margin of any control system given its polar plot In schaum's series I have read that Gain Margin=Ku/Ki but in given figure the system never becomes unstable so shouldn't Gain ...
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1answer
28 views

How do we determine the roots from a Routh-Hurwitz array?

I know that we can determine the roots on the right-half plane by counting the sign changes in the first column. However, I'm unsure how to find the roots on the left-half plane. Is it the same as the ...
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3answers
115 views

How does one position control a voice coil actuator?

I am looking at trying to position control a voice coil actuator (something like these). On the end of the voice coil actuator will be a small load (let's just imagine a 10 oz cube), screwed onto the ...
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0answers
26 views

Transfer Function For Electronic Pressure Regulator and a Step input

I was wondering if I could have some help in how to determine the transfer function for a Proportional Pressure Regulator. (VEAB-L-26-D7-Q4-V1-1R1). I have done a basic instrumentation and control ...
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1answer
59 views

Find the total gain from the following Signal Flow Graph

The signal flow graph for a system is given in the figure. Find resultant gain.
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2answers
118 views

Relationship Between Root Locus Pole and Percent Overshoot and Gain in MATLAB

I have a peculiar confusion regarding the relationship between a closed-loop pole on a root locus plot and its gain and percent overshoot. I have found a point on the root locus plot that MATLAB ...