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

1
vote
1answer
23 views

Steady State Error of Control System

I have a question regarding a control loop system which is subject to disturbance, unfortunately I missed a couple of lectures on the subject and now am scratching my head as to how to do it. The loop ...
-1
votes
1answer
15 views

How to configure stepper motor with encoder?

Steppers have a non-cumulative step error of ┬▒5%, at least all the ones I've seen. How do you avoid failing to detect a missed step, or detecting one where there isn't one?
1
vote
0answers
16 views

How to infer equivalent PID controller coefficients from an existing black box ccontroller?

I have a 2 input, 2 output system that I have recorded in response to 1. steps (actually quasi-steps, with 50 ms rise time + some overshoot), and 2. sine waves from 0.5 to 50 Hz, in both open and ...
0
votes
0answers
24 views

What is the Stability if Nyquist plot encirlcles -1 once but loop transfer function has one right pole? [on hold]

The answer is "Always Stable", but why? Is it necessary that the poles cancel?
0
votes
1answer
24 views

How do i go about finding the transfer function for this control system?

How do i go about finding the transfer function for this control system?
0
votes
0answers
33 views

conversion of kp,ki values

I have tuned a pi controller with kp, ki values in integer form using matlab simulink tool.To implement the pi on dsPIC33f it a requires fractional pi controller.How to convert conventional pi values ...
1
vote
2answers
38 views

help with multivariable control loop

I am looking to find the transfer function from w to z in this loop. I have been trying for a while looking all the relationships but just don't know how to express w in terms of r,d and n and then ...
0
votes
0answers
29 views

Designing a system to move a marble on a rotating beam from point A to point B using a servo

I need to figure out how to design a system to move a marble on rest at point A to point B at rest. See my drawing below for what I'm trying to accomplish: I have an Arduino I could use as a ...
1
vote
1answer
26 views

Is it possible to set initial state to a simulink model to do simulations?

Consider that I have built an electrical circuit, or a power system or any other at Simulink and to do simulations, Simulink should work in the sense that it builds a state space model of the system, ...
0
votes
0answers
34 views

Discrete disturbance observer

I am an autodidact in digital control and I have been solving following problem. I would like to construct a digital state observer combined with disturbance observer and I am not able to find ...
0
votes
1answer
22 views

How to implement a MIMO model with state space block in sumulink?

I want to implement an state space model with 4 inputs and 4 outputs at simulink. But the state space block has only one input and only one output. So what can I do here?
0
votes
1answer
31 views

k transfer function

If I'm giving a transfer function $$T(s) = \frac{G(s)}{1+G(s)H(s)}$$ When calculating the critical gain using the routh hurwitz method and calculating a negative value for k. What does that tell ...
0
votes
2answers
30 views

Root Loci Breakaway points

my question is regarding if the breakaway points exist or not. Do they only exist if 2 poles or 2 zeros are next to each other? Example if their are poles at -1 and -2 the breakaway point would be at ...
1
vote
1answer
50 views

Control Systems Stability

So I asked this question previously in the control theory section and got no responses. Ill try it here. Basically I need to find the ranges of k and \$\beta\$ such that the steady state error will be ...
0
votes
2answers
72 views

Switching on and off a LED light if a AC is passing through a wire or not

This is the basic setup of what I'm going to do. Have a wire plugged into the mains that is then connected to a ON/OFF flip switch then goes on to the rest of my project. Want I want to do is to add ...
0
votes
0answers
64 views

How to make a sound-controlled variable resistance?

So I have those old analog video equipements (Panasonic WJ-AVE5, Videonics Video Equalizer) and I'd like to have some of the parameters (video crossfade, superimpose function, brightness level, etc.) ...
1
vote
1answer
40 views

Heat exchanger identification

I have been developing a digital controller for water cooling system of power electronics converter. This system consists of plate heat exchanger, pipe with demineralized water flow (this fluid is ...
1
vote
1answer
27 views

Closed Loop 4 Sensor Control System

I have 4 on/off motors running individually (call them M1, M2, M3, M4) and 4 ping sensors (call them X1, X2, X3, X4) with a board placed in front of the motors and sensors. As the motors move forward ...
0
votes
1answer
37 views

proportional control offset

I understand that with proportional only control you have to have error or the control output goes to zero. The answer to this question Proportional controller was very informative. Mr. Lathrop ...
0
votes
2answers
52 views

How an equation in s domain is converted into z domian using zero hold method

I am just reading a research paper on matrix converter and i came through transfer function conversion from s domain into z domain. which i am unable to understand. how the equation 3.4 is transferred ...
1
vote
2answers
58 views

Is feedforward used in boost converter operating in DCM mode?

Is feedforward used in boost converter operating in DCM mode? I saw some examples where feedforward is used to control boost converter in CCM but not DCM mode. So I am wondering if it can be used in ...
3
votes
5answers
670 views

Could you explain how feedforward is used in walking?

I am reading about feedforward in control system. And in this lecture, slide 49, the author says that feedforward is common in human systems. Example, walking, playing basketball, driving a car. ...
0
votes
1answer
21 views

Qualitatively assessing time domain characteristics from bode plot

Given a bode diagram of loop transmission function, I have heard that it's possible to qualitatively assess the behavior of the system in time domain. These characteristics include delay time, ...
1
vote
1answer
55 views

A question about using PID to improve transient response for a DC motor

I have used PID a couple of times, but there is one thing I haven't been able to understand from any literature/textbooks. If I run a DC motor from a 12v battery for example, how can PID improve the ...
0
votes
0answers
35 views

Digital state space compensator based on current state observer

I have been solving following problem. I have a continuous system with following state space equations $$\left[\begin{matrix} \dot{x}_1 \\ \dot{x}_2 \end{matrix}\right] = \left[\begin{matrix}0 & 1 ...
0
votes
0answers
23 views

Feedback in Sampled Data System

I am new to digital control. I have a feedback loop as shown in figure. I tried solving for the closed loop transfer function but after following rules given in the books on Digital Control, I was ...
0
votes
1answer
52 views

Simulink Modeling Problem

I posted a question recently regarding PID controllers, and it was swiftly answered. I began to work up a Simulink model and I'm running into problems with my (simplistic) model. I want to work out ...
6
votes
4answers
488 views

Misconceptions about PID Controllers

I'm currently designing an equivalent of the mass-spring-dashpot system, and during the design phase I realized I don't fully understand how PID controllers physically work. Below is an image, the ...
1
vote
1answer
48 views

Transfer function of controller

I am solving this question given in book (Automatic control system). As asked in (a) part \$G_c(s)\$ of the controller. I solved it and getting answer$$G_c(s) = ...
2
votes
1answer
72 views

Unexpected LTSPICE Output - Voltage Mode Buck Convertor

I'm trying to simulate in LTSPICE a simple buck convertor taking 34V -> 20V @ 2.5A and I'm not seeing what I expect. Here is my circuit and some waveforms: The top half of the circuit is the ...
0
votes
2answers
70 views

Practical Implementation of Smith predictor

I am now dealing with Smith predictor and I understand that it's based on model of the controlled plant. This model I can get by some identification method, but such a model will never be absolutely ...
-3
votes
1answer
47 views

what type of modification can i use in my MCU in conjunction with my SSC32? [closed]

Hello there guys im looking for a way to connect and use a DC motor with a Servo controller such as the SSC32? now given the fact that a Servo controller or driver has 3 pins, PWR GND SIG/PULSE now ...
0
votes
1answer
79 views

Lead Compensator for double integrator

I am an autodidact in control engineering and I have been trying to design a lead compensator for double integrator system so that the closed loop poles have damping $$\zeta=0.5$$ and natural ...
0
votes
1answer
72 views

Input/output for buck-boost converter controller implemented with FPGA

I am trying to implement a voltage controller for a buck-boost converter using FPGA. The control method I'm trying to use is in this paper: www.engr.iupui.edu/~aizadian/index_files/Papers/C-28.pdf ...
3
votes
2answers
125 views

How to determine sinusoidal steady state response from bode plot

I'm given a problem by the following: Find the sinusoidal steady state response (in the time domain) of the following systems modeled by transfer function, P(s), to the input u(t). Use the Bode plot ...
0
votes
1answer
32 views

Feedback Control: Unexpected result for block diagram simplifications using matlab

I made some simple calculations regarding block diagram algebra. The problem is that I don't get the same result using matlab. Here is the system with it's corresponding blocks: $$H_1 = z+2$$ $$H_2 ...
0
votes
1answer
63 views

designing PID controller using Ziegler Nichols algorithm

I'm trying to use Ziegler Nichols algorithm to design PID controller for the following transfer function: G=w^2/(2*xws+w^2), w=1 , x=0.2. so since the step response for this function is a second ...
2
votes
2answers
57 views

Root locus of discrete time system

I have a question about a probably easy task, but I can't find the right K. I have the loop with an adjustable gain element given: $$Q(z) = \frac{H(z)}{1+ K\cdot G(z)H(z)} $$ I have given: $$H(z) ...
1
vote
3answers
106 views

Can 3-phase FOC control be done without current measurement?

Can a FOC control scheme be done using a rotary encoder to measure the position, speed and acceleration directly, or is measuring current necessary? FOC is a motor control scheme as described in ...
4
votes
3answers
183 views

How to measure temperature of a syrofoam cutter hot wire?

I would like to create a hot wire foam cutter device. The wire material is nichrome, diameter 0.9mm, resistance is about 1.7 Ohm/meter. For best cutting results, I would like to control the ...
0
votes
2answers
100 views

Control system stability with respect to gain margin and phase margin

I have learn from control system that for a stable system gain margin and phase margin both must be positive. That is the truth. But I have a doubt about this simple third order type 2 open loop ...
0
votes
2answers
105 views

Stability of a differentiator

I'm a bit confused regarding the stability of a differentiator and an integrator. When an integrator is added to the system it decreases the stability as it adds a pole at origin and bends the root ...
0
votes
3answers
131 views

How actually an integral transformation(Fourier and Laplace) works?

After seeing a question on one of the posts I got this confusion in my mind. Here I'm not much interested in just mathematical explanation but I would like to know how a transformation actually turns ...
3
votes
5answers
120 views

Laplace transform and the idea of frequency domain analysis

I have studied control theory in depth in my undergrad and still continue to use it on many occasions in my PhD work, but i still don't fully understand why we call Laplace transformation of system a ...
0
votes
2answers
59 views

How to perform a \$\dfrac{1}{s+a}\$ type integration in MATLAB?

Currently, I am integrating an ODE of the form \$\dot x = f(x,t)\$ in MATLAB using the function ode45 This is equivalent (in block diagram form) as passing \$\dot x\$ through an integrator ...
0
votes
1answer
56 views

Control theory - how to represent these transfer functions?

I'm learning control theory. Block diagram for transfer function: is: What would be block diagram for these two transfer functions: $$H(s)=\frac{1}{s^{2}+1}$$ and $$H(s)=s\frac{1}{s+1}$$?
0
votes
3answers
74 views

Finding Open/closed loop transfer function

I plan to determine the open/close loop transfer function of the attached motor. I have been able to combine K(s) to 1/s in series but am not too sure of how to add up 12/pi outside the summing ...
0
votes
1answer
43 views

Design a P-Controller given the root locus ?

I used to have the transfer function given but here the root locus instead ... Can one help with the start...
0
votes
1answer
60 views

problem : find the coefficients of linear system used to build a digital oscillator ..?

Please can one explain to me I having difficulty on how to start Thank you all *** can anyone correct me if anything is wrong !
0
votes
0answers
61 views

Nyquist criterion and the gain/phase margin of transfer function?

Now to determine gain/phase margin I need the bode plot. and to find the value of k such that the system is stable I have to do Nyquist criterion for the closed loop transfer function. (Question: ...