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 ...

learn more… | top users | synonyms

12
votes
6answers
686 views

PID algorithm: how to account for fast input value changes after a long delay

I am trying to implement a basic PID algorithm on an Arduino Leonardo to mix hot and cold tap water using servo-controlled valves. The goal is to hold the temperature as close to a setpoint as ...
0
votes
1answer
40 views

Control Engineering: Model parameter estimation for a motor which will be under various loads

I am creating a closed loop controller for a motor which is part of a robotic arm. I give it a required angle, the controller calculates a control input, the motor moves, a pot feedbacks the angle, ...
-1
votes
0answers
24 views

Design of PID control for a vibration exciter (shaker) without having the plant model

I want to design a PID controller for a shaker. But I don't have the system's differential equation or transfer function. I find the system identification algorithms complicated. Can I design a ...
1
vote
2answers
26 views

System identification on a non linear system

I am trying to estimate a transfer function for a pan - tilt unit. It's input parameter is a velocity, but it is constrained to move from 0∘ - 359∘ and the other way around. Saying in another way, it ...
-1
votes
0answers
32 views

How do timing networks work? [migrated]

I am curious on how timer networks are used in Corridor Lighting systems and what components are used?
1
vote
0answers
21 views

References for control of piezoelectric cantilevers [closed]

I have a strong background on control theory I want to know more about how to model and control piezoelectric cantilevers. Are there any introductory text books on this subject? More specifically, a ...
0
votes
1answer
73 views

Remotely control power supply with adjustable voltage

I have a power supply unit with adjustable output voltage. The output voltage is adjusted using a potentiometer. However, I need to change output voltage remotely and dynamically. What kind of ...
1
vote
1answer
52 views

Control Engineering: Why are the Equation Error and Output Error different?

When modelling a system you must first estimate the form of the transfer function (order, time delay etc.), and then estimate the parameters (coefficients for the transfer function). A common way to ...
0
votes
0answers
27 views

Stablization of a $w$-system

I have the following system to be stabilized: \begin{equation} \begin{aligned}\dot{w}=Aw+Bv \\& A=\left( \begin{array}{ccc} 1 & 1 & 2 \\ 1 & 2 & 3 \\ 1 & 2 & 0 \\ ...
2
votes
1answer
75 views

State space modeling with disturbances using Matlab

I am doing a project which involves modeling a quadcopter in state space form using matlab. I first had to linearize the quadcopter equations of motion, and now have to implement them in a matlab ...
0
votes
1answer
76 views

MATLAB error: “acker” function not returning the same thing as ackermann's formula

I have a discrete time system Suppose I have the following AB matrix of my system $$A = \begin{bmatrix} 0 & 1 \\ 1 & 1.5 \\ \end{bmatrix} $$ $$B = \begin{bmatrix} 0 \\ 1 \\ ...
0
votes
1answer
69 views

Classic control theory - Negative gain required for a finite velocity error?

I have an assignment to design a control system with 2 degrees of freedom (Prefilter + Controller) to control a plant with the following transfer function: $$P(s)= \frac{2}{s(s-3)}$$ I am required to ...
0
votes
1answer
56 views

How to design a PID controller with no additional i) gain margin, ii) phase margin?

Given a system G(s), how do I design a controller C(s) such that no additional phase or gain margin is incurred? I would like to do this analytically Surely I could go through the step of drawing a ...
0
votes
1answer
63 views

Why does Nyquist plot only need loop gain but not the entire closed loop transfer function?

I was trying to compare a Bode plot and a Nyquist plot of the same system and realized that I was probably comparing apples to oranges Bode plot is plotting the entire closed loop transfer function, ...
0
votes
1answer
91 views

Help with building a 3 Phase DC Motor Controller

I'm looking to design the power stage of a 3 Phase DC Motor Controller for use with the Emrax 268 motor. The maximum input battery voltage would be no higher than 300VDC and the maximum continuous ...
0
votes
1answer
42 views

What is this process called: Analog input, with a analog output with setpoint

What is this process called: In my example the analog input represents line current. The analog output represents voltage. this is a closed loop with a target set point. The behavior would be that ...
2
votes
2answers
131 views

Why would Z/P cancellation with real part > 0 between the plant and the controller make the system unstable?

Can someone help me verify the claim if there is a zero pole cancellation with real part > 0 between controller Gc and plant Gp, then the system is not stable? I can't find any literature that ...
0
votes
2answers
58 views

What are some of the real life example of the so called “tracking and regulation” problem in control theory?

Given a plant, we need to design a controller that takes in an input r and then ensure that steady state error between the output and input goes to zero while the system remains stable. What is a ...
0
votes
2answers
107 views

Designing a PI controller for a first order system

I have a first order plant $$ b/(s + a) $$ That I'm trying to control using a PI controller $$ \frac{(K_ps + K_I)}{s} $$ I closed the loop with unity feedback to get this Transfer function ...
1
vote
1answer
111 views

Mathematical model of the temperature of resistors/heatsinks?

I want to model the transfer function of a resistor mathematically, and am after some resources / tips on if it's possible to do so. For example, if I put 1V into a 1 Ohm resistor, I want to know how ...
-1
votes
1answer
73 views

Lag compensator Design

I have system having unity feedback gain. Use a lag compensator to get 10% overshoot. settling time of 1sec. $$g(s) =\frac{0.1 s^2 + 0.7 s + 1}{s^3 + 6.98 s^2 + 9.86 s + 19.8}$$ Continuous-time ...
2
votes
2answers
148 views

How do electrical engineers actually apply control theory in real life?

I am currently taking a course in control theory. In control theory the system or impulse response is usually an algebraic expression in Laplace domain. Much of the work done in school is to find ...
1
vote
2answers
140 views

What does it mean to have a pole or zero at infinity?

what does it signify ? At pole/zero frequencies the response of a system goes to infinity/zero, so I think same is the case with poles/zeros at infinity, but how do these poles/zeros affect the design ...
1
vote
1answer
88 views

current control via microcontroller

I have a micro-controller which calculates and decides about the current each minute. Then for one minute the circuit must hold that current constant. Then it should control the current via a buck ...
0
votes
0answers
16 views

Averaging of state space equations for a multi input dc-dc converter

If I have a converter with one switch, then I can find the average state space matrices as A= kA1 + (1-k)A2 where A1 is matrix when switch is off and A2 when switch is off, k is duty cycle of the ...
1
vote
2answers
112 views

Stability of an unstable system using nonlinear element. Is it possible or not?

Say there is an system with open-loop transfer function $$G(s)=\frac{1}{s-1}$$ The system is definitely unstable. If I put an any nonlinear system in cascade with \$G(s)\$ & from the output, a ...
0
votes
0answers
29 views

Averaging of state space equations for a multi input dc-dc converter

If I have a converter with one switch, then I can find the average state space matrices as A= kA1 + (1-k)A2 where A1 is matrix when switch is off and A2 when switch is off, k is duty cycle of the ...
0
votes
2answers
188 views

Obtaining stability information from Bode plots

I am trying to understand the theory behind gain and phase margins from Bode Plots for systems with negative feedback, specifically this one: The transfer function for this system is: $$ ...
0
votes
1answer
73 views

Control theory: What is the physical interpretation of asymptotic stability

For Bounded Input, Bounded Output stability (BIBO), there is a very nice interpretation. All it means is that if for any finite signal the system produces a finite output signal, then the system ...
0
votes
0answers
61 views

Brushless DC motor or stepper motor for specific application

The specific application is for moving (or traversing) a carriage up and down a lead screw. The lead screw is rotated by a motor. Here is a rough idea: - Since 1996 a stepper motor has been used ...
1
vote
2answers
54 views

Control theory: What is the relationship between the number of elements in your system, and your diff'eq IO model and the dimension ABCD Matrix?

From my understanding, the order of your system is directly proportional to the number of elements in your system. Suppose I have a circuit containing 6 capitors/inductors Then the order of my ...
0
votes
0answers
47 views

implemented feedback loop to count pulses but loop doesn't work

I am implementing feedback loop which count number of pulses from optical encoder and convert it to rpm(speed). But i noticed that number of pulse count remains same irrrespect of the motor speed. I ...
1
vote
2answers
45 views

Why is any lumped parameter system modelled with an ODE?

I'm studying Control Theory and the book jumps from a input-output representation of the system to a ODE model. Initially, the book derives that any causal system can be represented as: \$y(t) = ...
0
votes
1answer
279 views

Optical encoder in Proteus

I am working on dc motor speed control project in proteus and for the feedback i am using optical encoder.Dc motor speed is calculated by counting pulses from encoder. But i wanted to know what is ...
0
votes
2answers
105 views

Identifying position transfer function for a DC motor

I am trying to identify a simple position/speed system based on the inputs and outputs using a DC motor equipped with a qudrature encoder.For the soft i am using xcorr and arduino blocks to apply a ...
0
votes
0answers
54 views

Can someone give me a definition of “agent” as used in engineering?

I went to a presentation today and part of it is about multi-agent system. I thought that the speaker would introduce the term but regrettably he did not. Can someone provide a definition of agent as ...
0
votes
1answer
129 views

Since the z-transform of the zero order hold is 1, why bother including it in analysis or simulation?

The \$z\$-transform of the zero order hold is 1. So why should it even be considered in the discrete time analysis or simulation of discrete time control systems? ...
2
votes
1answer
246 views

Using a Contactor or Relay to switch between two DC power sources?

I want to power a motor with a battery, however the complication arises as I want to have two power sources and be able to switch between them. The context of this problem is for an electric vehicle. ...
2
votes
3answers
112 views

What is the effect of aliasing in discrete time controller?

Suppose we have a controller whose TF is $$ G(s) = \frac{1}{(s^2+1)} $$ This yields two marginally stable poles at \$ s = \pm j \$ Now let's discretize the controller through z transform, after ...
1
vote
2answers
231 views

How to switch between two DC power sources powering a motor on an electric vehicle?

Background: For a university final project, my student group is investigating the possiblility of powering a motorcycle with two seperate batteries, each of a different chemistry (Lead-acid and ...
4
votes
3answers
149 views

Transfer functions with constant voltage sources in them?

I am trying to get the transfer function: $$H(s)=\frac{V_o}{I_i}$$ For the following circuit: simulate this circuit – Schematic created using CircuitLab I think I can get it without ...
0
votes
2answers
387 views

Make hard drive stepper motor run 7200 rpm

I have an old hard drive (7200 rpm) motor like this: I'm trying to make it run as fast as possible and I start with this code (arduino uno): ...
6
votes
3answers
241 views

How to design controllers “properly”?

It may sound like the "easy way" to ask it here, but this question (along with a couple others I've posted which were more specific) is the result of years of research on the topic - on and off as ...
-3
votes
1answer
70 views

When do we prefer Laplace signal form instead of time signal form - Control Engineering [closed]

I am struggling to see when you will prefer laplace transform X(s) instead of a time domain signal x(t). What does Laplace transform tell you? What is the benefits to use Laplace transform? What ...
1
vote
3answers
174 views

Implementing differentiation and integration in a digital control system?

In a computer control system (microcontroller-based), the sampling time of the inputs to the system determine whether to treat the system as a discrete system or continuous. From what I have learnt, ...
-2
votes
1answer
68 views

Lead-lag process control

What is the locus of the following system, and for what value of \$\alpha\$ is the damping ratio 0.5?
0
votes
1answer
99 views

Why can I ignore the “imaginary” value from the gain of my system?

I’m in the final year of my education, and for the exam training I had to find the K (or max gain) value of the given system when the desired damping ration equals 0,7. What i have done to addres the ...
0
votes
2answers
46 views

finding a system behaviour [duplicate]

Why is step response so important? for finding properties of a system we use step response of a system why we don't use other basic signals such as impulse or ramp? thanks for your responses.
0
votes
3answers
50 views

Does this article's appendix contain an error (is the heating system described integral control)?

I am confused by the primer on control theory found at the end of the following paper, which concerns an instance of integral control in a biological system. Since it concerns integral control, I ...
-3
votes
2answers
81 views

regulator ac to dc with

I am studying for my EE exam ,I understand the general working of the circuit but there is some details about it I have to know. this regulator supply 24 volt with puissance nominale 200watt. it ...